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Jun Nozawa

Section

Institute for Materials Research

Job title

Associate Professor

Degree

博士（理学）（東北大学）
修士（理学）（東北大学）

researchmap

https://researchmap.jp/read0152046

J-GLOBAL ID

201001076676677440

Professional Memberships 2

日本応用物理学会
日本結晶成長学会

Research Interests 2

colloid
crystal growth

Research Areas 1

Nanotechnology/Materials / Polymer chemistry /

Awards 3

日本結晶成長学会第38回論文賞

2021/10　日本結晶成長学会
Poster Prizes

2021/06　Designed Assembly of Colloids at Interfaces: Fundamentals to Applications (2021)
日本結晶成長学会講演奨励賞

2005/08　日本結晶成長学会

Papers 77

Multistep Crystallization of the Heteroepitaxially Grown Binary Colloidal Crystals

Jun Nozawa, Masahide Sato, Satoshi Uda, Lu-Chung Chuang, Kozo Fujiwara

Crystal Growth & Design　2025/08/18

DOI： 10.1021/acs.cgd.5c00963 　
Role of small additive particles in hexagonal structure formation by colloidal heteroepitaxy

Masahide Sato, Jun Nozawa

The Journal of Chemical Physics　2025/07/21

DOI： 10.1063/5.0275339 　
Kagome Lattice Formation through Preliminary Structures in Colloidal Heteroepitaxy

Masahide Sato, Jun Nozawa

The Journal of Physical Chemistry B　2025/05/22

DOI： 10.1021/acs.jpcb.5c01092 　
Polymorphic transitions during nonclassical nucleation and growth in the colloidal heteroepitaxy

Jun Nozawa, Masahide Sato, Satoshi Uda, Kozo Fujiwara

Communications Physics　2025/04/09

DOI： 10.1038/s42005-025-02062-9 　
Multi-layer kagome lattices assembled with isotropic spherical colloids via heteroepitaxial growth

Jun Nozawa, Masahide Sato, Satoshi Uda, Kozo Fujiwara

Colloid and Interface Science Communications　64　100815-100815　2025/01
Publisher: Elsevier BV
DOI： 10.1016/j.colcom.2024.100815 　

ISSN： 2215-0382
In situ observation and numerical analysis of temperature gradient effects on growth velocity during directional solidification of silicon

Peiyao Hao, Lu-Chung Chuang, Kensaku Maeda, Jun Nozawa, Haruhiko Morito, Kozo Fujiwara, Lili Zheng

Journal of Materials Science　59　(39)　18446-18460　2024/10/01
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10853-024-10277-4 　

ISSN： 0022-2461

eISSN： 1573-4803

More details Close

Abstract The < 110 > directional solidification of silicon under varying overall temperature gradients was investigated using an in situ observation system. The growth velocity of an atomically rough interface was found to decrease with increasing temperature gradient. A theoretical model of the thermal field taking undercooling into account was developed to describe this phenomenon and was demonstrated to be valid. The results of this work indicate that the reported linear relationship between growth velocity (V) and undercooling (ΔT), given by V (mm s⁻¹) = 120ΔT (K), is most accurate in the case of a rough interface. In the case that the overall temperature gradient is small, the melting point isotherm moves rapidly such that it becomes more difficult for the interface to keep pace with the isotherm compared with a large temperature gradient. This effect leads to increased undercooling at the interface and consequently a rapid growth velocity. Thermal field calculations confirm that a rapid increase in the ratio of the temperature gradient in the crystal to that in the melt should increase the latent heat release, again providing a more rapid growth velocity.
Dislocation interaction with vicinally faceted groove at grain boundary in multi-crystalline silicon

Fan Yang, Lu-Chung Chuang, Kensaku Maeda, Jun Nozawa, Haruhiko Morito, Kozo Fujiwara, Thierry Duffar

Journal of Crystal Growth　639　127722-127722　2024/08
Publisher: Elsevier BV
DOI： 10.1016/j.jcrysgro.2024.127722 　

ISSN： 0022-0248
Misorientation increase of small-angle grain boundaries during directional solidification of silicon

Lu-Chung Chuang, Kensaku Maeda, Jun Nozawa, Haruhiko Morito, Kozo Fujiwara

Journal of Crystal Growth　127822-127822　2024/07
Publisher: Elsevier BV
DOI： 10.1016/j.jcrysgro.2024.127822 　

ISSN： 0022-0248
Vicinal (111) surfaces at Si solid-liquid interface during unidirectional solidification

Shashank Shekhar Mishra, Lu Chung Chuang, Jun Nozawa, Kensaku Maeda, Haruhiko Morito, Kozo Fujiwara, Thierry Duffar

Scripta Materialia　247　2024/07/01

DOI： 10.1016/j.scriptamat.2024.116116 　

ISSN： 1359-6462
In situ study of growth kinetics of {1 0 0} and {1 1 0} crystal/melt interfaces during unidirectional solidification of silicon

Shashank Shekhar Mishra, Lu Chung Chuang, Kensaku Maeda, Jun Nozawa, Haruhiko Morito, Thierry Duffar, Kozo Fujiwara

Journal of Crystal Growth　627　2024/02/01

DOI： 10.1016/j.jcrysgro.2023.127524 　

ISSN： 0022-0248
Difference in growth rates at {1 1 0} and {1 1 1} crystal/melt interfaces of silicon Peer-reviewed

Shashank Shekhar Mishra, Lu-Chung Chuang, Kensaku Maeda, Jun Nozawa, Haruhiko Morito, Kozo Fujiwara

Journal of Crystal Growth　593　126784-126784　2022/09
Publisher: Elsevier BV
DOI： 10.1016/j.jcrysgro.2022.126784 　

ISSN： 0022-0248
Heteroepitaxial Growth of Colloidal Crystals: Dependence of the Growth Mode on the Interparticle Interactions and Lattice Spacing Peer-reviewed

Jun Nozawa, Satoshi Uda, Hiromasa Niinomi, Junpei Okada, Kozo Fujiwara

The Journal of Physical Chemistry Letters　6995-7000　2022/07/27

DOI： 10.1021/acs.jpclett.2c01707 　

eISSN： 1948-7185
Heteroepitaxial fabrication of binary colloidal crystals by a balance of interparticle interaction and lattice spacing Peer-reviewed

Jun Nozawa, Satoshi Uda, Akiko Toyotama, Junpei Yamanaka, Hiromasa Niinomi, Junpei Okada

JOURNAL OF COLLOID AND INTERFACE SCIENCE　608　873-881　2022/02

DOI： 10.1016/j.jcis.2021.10.041 　

ISSN： 0021-9797

eISSN： 1095-7103
Crystallization of charged gold particles mediated by nonadsorbing like-charged polyelectrolyte Peer-reviewed

Miyu Ioka, Akiko Toyotama, Megumi Yamaguchi, Jun Nozawa, Satoshi Uda, Tohru Okuzono, Masamichi Yoshimura, Junpei Yamanaka

JOURNAL OF CHEMICAL PHYSICS　154　(23)　2021/06

DOI： 10.1063/5.0052339 　

ISSN： 0021-9606

eISSN： 1089-7690
Structural transformations of growing thin colloidal crystals in confined space via convective assembly Peer-reviewed

Sumeng Hu, Jun Nozawa, Kejia Kang, Suxia Guo, Haruhiko Koizumi, Zon-Han Wei, Satoshi Uda

JOURNAL OF COLLOID AND INTERFACE SCIENCE　591　300-306　2021/06

DOI： 10.1016/j.jcis.2021.02.016 　

ISSN： 0021-9797

eISSN： 1095-7103
Chiral Optical Force Generated by a Superchiral Near-Field of a Plasmonic Triangle Trimer as Origin of Giant Bias in Chiral Nucleation: A Simulation Study Peer-reviewed

Hiromasa Niinomi, Teruki Sugiyama, An-Chieh Cheng, Miho Tagawa, Toru Ujihara, Hiroshi Y. Yoshikawa, Ryuzo Kawamura, Jun Nozawa, Junpei T. Okada, Satoshi Uda

JOURNAL OF PHYSICAL CHEMISTRY C　125　(11)　6209-6221　2021/03

DOI： 10.1021/acs.jpcc.0c11109 　

ISSN： 1932-7447

eISSN： 1932-7455
Effect of interface electric field on partitioning during the growth of conventional and true congruent-melting LiNbO3 crystals Peer-reviewed

Qilin Shi, Jun Nozawa, Satoshi Uda

Journal of Crystal Growth　549　125864-125864　2020/11
Publisher: Elsevier BV
DOI： 10.1016/j.jcrysgro.2020.125864 　

ISSN： 0022-0248
High-Density Liquid Water at a Water–Ice Interface Peer-reviewed

Hiromasa Niinomi, Tomoya Yamazaki, Hiroki Nada, Tetsuya Hama, Akira Kouchi, Junpei T. Okada, Jun Nozawa, Satoshi Uda, Yuki Kimura

The Journal of Physical Chemistry Letters　11　(16)　6779-6784　2020/08/20
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.jpclett.0c01907 　

ISSN： 1948-7185

eISSN： 1948-7185
Plasmonic Manipulation of Sodium Chlorate Chiral Crystallization: Directed Chirality Transfer via Contact-Induced Polymorphic Transformation and Formation of Liquid Precursor Peer-reviewed

Hiromasa Niinomi, Teruki Sugiyama, Miho Tagawa, Toru Ujihara, Takashige Omatsu, Katsuhiko Miyamoto, Hiroshi Y. Yoshikawa, Ryuzo Kawamura, Jun Nozawa, Junpei T. Okada, Satoshi Uda

Crystal Growth & Design　20　(8)　5493-5507　2020/08/05
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.cgd.0c00693 　

ISSN： 1528-7483

eISSN： 1528-7505
Growth and One-Dimensional Heteroepitaxy of Binary Colloidal Crystals Peer-reviewed

Jun Nozawa, Satoshi Uda, Akiko Toyotama, Junpei Yamanaka, Hiromasa Niinomi, Junpei Okada

CRYSTAL GROWTH & DESIGN　20　(5)　3247-3256　2020/05

DOI： 10.1021/acs.cgd.0c00078 　

ISSN： 1528-7483

eISSN： 1528-7505
Effects of Solution Flow on the Growth of Colloidal Crystals Peer-reviewed

Jun Nozawa, Satoshi Uda, Suxia Guo, Akiko Toyotama, Junpei Yamanaka, Hiromasa Niinomi, Junpei Okada

LANGMUIR　36　(16)　4324-4331　2020/04

DOI： 10.1021/acs.langmuir.0c00335 　

ISSN： 0743-7463
Secondary phase formation by liquid immiscibility in Ca3Ta(Ga1−xAlx)3Si2O14 melt Peer-reviewed

Honda, Y., Niinomi, H., Nozawa, J., Okada, J., Uda, S.

Journal of Crystal Growth　522　117-124　2019/09

DOI： 10.1016/j.jcrysgro.2019.06.022 　

ISSN： 0022-0248
In Situ Microscopic Observation on Surface Kinetics in Optical Trapping-Induced Crystal Growth: Step Formation, Wetting Transition, and Nonclassical Growth Peer-reviewed

Hiromasa Niinomi, Teruki Sugiyama, Toru Ujihara, Suxia Guo, Jun Nozawa, Junpei Okada, Takashige Omatsu, Satoshi Uda

Crystal Growth & Design　19　(7)　4138-4150　2019/07

DOI： 10.1021/acs.cgd.9b00600 　

ISSN： 1528-7483

eISSN： 1528-7505
Effect of Substrate on Nucleation Rate of Two-Dimensional Colloidal Crystals Peer-reviewed

Suxia Guo, Jun Nozawa, Masashi Mizukami, Kazue Kurihara, Akiko Toyotama, Junpei Yamanaka, Hiromasa Niinomi, Junpei Okada, Satoshi Uda

CRYSTAL GROWTH & DESIGN　19　(6)　3215-3221　2019/06

DOI： 10.1021/acs.cgd.9b00069 　

ISSN： 1528-7483

eISSN： 1528-7505
Kink Distance and Binding Energy of Colloidal Crystals Peer-reviewed

Jun Nozawa, Satoshi Uda, Suxia Guo, Akiko Toyotama, Junpei Yamanaka, Naoki Ihara, Junpei Okada

CRYSTAL GROWTH & DESIGN　18　(10)　6078-6083　2018/10

DOI： 10.1021/acs.cgd.8b00942 　

ISSN： 1528-7483

eISSN： 1528-7505
Instability of crystal/melt interface in Si-rich SiGe Peer-reviewed

M. Mokhtari, K. Fujiwara, G. Takakura, K. Maeda, H. Koizumi, J. Nozawa, S. Uda

Journal of Applied Physics　124　(8)　085104-1-085104-5　2018/08

DOI： 10.1063/1.5038755 　

ISSN： 0021-8979

eISSN： 1089-7550
Step Kinetics Dependent on the Kink Generation Mechanism in Colloidal Crystal Growth Peer-reviewed

Jun Nozawa, Satoshi Uda, Suxia Guo, Akiko Toyotama, Junpei Yamanaka, Junpei Okada, Haruhiko Koizumi

CRYSTAL GROWTH & DESIGN　18　(5)　2948-2955　2018/05

DOI： 10.1021/acs.cgd.8b00063 　

ISSN： 1528-7483

eISSN： 1528-7505
Crystallization Technique of High-Quality Protein Crystals Controlling Surface Free Energy Peer-reviewed

Haruhiko Koizumi, Satoshi Uda, Katsuo Tsukamoto, Masaru Tachibana, Kenichi Kojima, Junpei Okada, Jun Nozawa

CRYSTAL GROWTH & DESIGN　17　(12)　6712-6718　2017/12

DOI： 10.1021/acs.cgd.7b01315 　

ISSN： 1528-7483

eISSN： 1528-7505
Heterogeneous Nucleation of Colloidal Crystals on a Glass Substrate with Depletion Attraction Peer-reviewed

Suxia Guo, Jun Nozawa, Sumeng Hu, Haruhiko Koizumi, Junpei Okada, Satoshi Uda

LANGMUIR　33　(40)　10543-10549　2017/10

DOI： 10.1021/acs.langmuir.7b01906 　

ISSN： 0743-7463
Effect of an External Electric Field on the Kinetics of Dislocation-Free Growth of Tetragonal Hen Egg White Lysozyme Crystals Peer-reviewed

Haruhiko Koizumi, Satoshi Uda, Kozo Fujiwara, Junpei Okada, Jun Nozawa

CRYSTALS　7　(6)　2017/06

DOI： 10.3390/cryst7060170 　

ISSN： 2073-4352
Two-Dimensional Nucleation on the Terrace of Colloidal Crystals with Added Polymers Peer-reviewed

Jun Nozawa, Satoshi Uda, Suxia Guo, Sumeng Hu, Akiko Toyotama, Junpei Yamanaka, Junpei Okada, Haruhiko Koizumi

LANGMUIR　33　(13)　3262-3269　2017/04

DOI： 10.1021/acs.langmuir.6b04532 　

ISSN： 0743-7463
Effect of point defects on Curie temperature of lithium niobate Peer-reviewed

Chihiro Koyama, Jun Nozawa, Kozo Fujiwara, Satoshi Uda

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　100　(3)　1118-1124　2017/03

DOI： 10.1111/jace.14701 　

ISSN： 0002-7820

eISSN： 1551-2916
Liquid immiscibility in a CTGS (Ca3TaGa3Si2O14) melt Peer-reviewed

Jun Nozawa, Hengyu Zhao, Chihiro Koyama, Kensaku Maeda, Kozo Fujiwara, Haruhiko Koizumi, Satoshi Uda

JOURNAL OF CRYSTAL GROWTH　454　82-86　2016/11

DOI： 10.1016/j.jcrysgro.2016.09.005 　

ISSN： 0022-0248

eISSN： 1873-5002
Crystallization Technique for Strain-free Protein Crystals Using Cross-linked Seed Crystals Peer-reviewed

Haruhiko Koizumi, Satoshi Uda, Masaru Tachibana, Katsuo Tsukamoto, Kenichi Kojima, Jun Nozawa

CRYSTAL GROWTH & DESIGN　16　(10)　6089-6094　2016/10

DOI： 10.1021/acs.cgd.6b01136 　

ISSN： 1528-7483

eISSN： 1528-7505
Technique for High-Quality Protein Crystal Growth by Control of Subgrain Formation under an External Electric Field Peer-reviewed

Haruhiko Koizumi, Satoshi Uda, Kozo Fujiwara, Masaru Tachibana, Kenichi Kojima, Jun Nozawa

CRYSTALS　6　(8)　2016/08

DOI： 10.3390/cryst6080095 　

ISSN： 2073-4352
Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions Peer-reviewed

Yoshihisa Suzuki, Yoshiaki Hattori, Jun Nozawa, Satoshi Uda, Akiko Toyotama, Junpei Yamanaka

CRYSTALS　6　(7)　2016/07

DOI： 10.3390/cryst6070080 　

ISSN： 2073-4352
In-situ observation of colloidal crystallization Peer-reviewed

Junpei Yamanaka, Yoshihisa Suzuki, Jun Nozawa, Tsutomu Sawada

PROGRESS IN CRYSTAL GROWTH AND CHARACTERIZATION OF MATERIALS　62　(2)　413-416　2016/06

DOI： 10.1016/j.pcrysgrow.2016.04.025 　

ISSN： 0960-8974
Effect of grain boundary grooves at the crystal/melt interface on impurity accumulation during the unidirectional growth of multicrystalline silicon Peer-reviewed

Morgane Mokhtari, Kozo Fujiwara, Haruhiko Koizumi, Jun Nozawa, Satoshi Uda

SCRIPTA MATERIALIA　117　73-76　2016/05

DOI： 10.1016/j.scriptamat.2016.02.027 　

ISSN： 1359-6462
Effect of Solid-Liquid Interface Morphology on Grain Boundary Segregation during Colloidal Polycrystallization Peer-reviewed

Sumeng Hu, Jun Nozawa, Suxia Guo, Haruhiko Koizumi, Kozo Fujiwara, Satoshi Uda

CRYSTAL GROWTH & DESIGN　16　(5)　2765-2770　2016/05

DOI： 10.1021/acs.cgd.6b00066 　

ISSN： 1528-7483

eISSN： 1528-7505
Orientation-dependent impurity partitioning of colloidal crystals Peer-reviewed

Jun Nozawa, Satoshi Uda, Sumeng Hu, Kozo Fujiwara, Haruhiko Koizumi

JOURNAL OF CRYSTAL GROWTH　439　13-18　2016/04

DOI： 10.1016/j.jcrysgro.2015.12.047 　

ISSN： 0022-0248

eISSN： 1873-5002
Grain Boundary Segregation of Impurities During Polycrystalline Colloidal Crystallization Peer-reviewed

Sumeng Hu, Jun Nozawa, Haruhiko Koizumi, Kozo Fujiwara, Satoshi Uda

CRYSTAL GROWTH & DESIGN　15　(12)　5685-5692　2015/12

DOI： 10.1021/acs.cgd.5b00646 　

ISSN： 1528-7483

eISSN： 1528-7505
Crystallization of high-quality protein crystals using an external electric field Peer-reviewed

H. Koizumi, S. Uda, K. Fujiwara, M. Tachibana, K. Kojima, J. Nozawa

JOURNAL OF APPLIED CRYSTALLOGRAPHY　48　(5)　1507-1513　2015/10

DOI： 10.1107/S1600576715015885 　

ISSN： 1600-5767
The solid-solution region for the langasite-type Ca3TaGa3Si2O14 crystal as determined by a lever rule Peer-reviewed

Hengyu Zhao, Satoshi Uda, Kensaku Maeda, Jun Nozawa, Haruhiko Koizumi, Kozo Fujiwara

JOURNAL OF CRYSTAL GROWTH　415　111-117　2015/04

DOI： 10.1016/j.jcrysgro.2014.12.042 　

ISSN： 0022-0248

eISSN： 1873-5002
Investigation of defect structure of impurity-doped lithium niobate by combining thermodynamic constraints with lattice constant variations Peer-reviewed

Chihiro Koyama, Jun Nozawa, Kensaku Maeda, Kozo Fujiwara, Satoshi Uda

JOURNAL OF APPLIED PHYSICS　117　(1)　014102　2015/01

DOI： 10.1063/1.4905286 　

ISSN： 0021-8979

eISSN： 1089-7550
Control of Subgrain Formation in Protein Crystals by the Application of an External Electric Field Peer-reviewed

H. Koizumi, S. Uda, K. Fujiwara, M. Tachibana, K. Kojima, J. Nozawa

CRYSTAL GROWTH & DESIGN　14　(11)　5662-5667　2014/11

DOI： 10.1021/cg500946b 　

ISSN： 1528-7483

eISSN： 1528-7505
Partitioning of ionic species during growth of impurity-doped lithium niobate by electric current injection Peer-reviewed

Jun Nozawa, Shintaro Iida, Chihiro Koyama, Kensaku Maeda, Kozo Fujiwara, Haruhiko Koizumi, Satoshi Uda

JOURNAL OF CRYSTAL GROWTH　406　78-84　2014/11

DOI： 10.1016/j.jcrysgro.2014.08.001 　

ISSN： 0022-0248

eISSN： 1873-5002
Crystal growth and equilibrium crystal shapes of silicon in the melt Peer-reviewed

Xinbo Yang, K. Fujiwara, K. Maeda, J. Nozawa, H. Koizumi, S. Uda

PROGRESS IN PHOTOVOLTAICS　22　(5)　574-580　2014/05

DOI： 10.1002/pip.2290 　

ISSN： 1062-7995

eISSN： 1099-159X
Instability of crystal/melt interface including twin boundaries of silicon Peer-reviewed

K. Fujiwara, M. Tokairin, W. Pan, H. Koizumi, J. Nozawa, S. Uda

APPLIED PHYSICS LETTERS　104　(18)　182110　2014/05

DOI： 10.1063/1.4876177 　

ISSN： 0003-6951

eISSN： 1077-3118
Crystal Growth under External Electric Fields Peer-reviewed

Satoshi Uda, Haruhiko Koizumi, Jun Nozawa, Kozo Fujiwara

INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2014 (ICCMSE 2014)　1618　261-264　2014

DOI： 10.1063/1.4897723 　

ISSN： 0094-243X
Enhancement of Crystal Homogeneity of Protein Crystals under Application of an External Alternating Current Electric Field Peer-reviewed

H. Koizumi, S. Uda, K. Fujiwara, M. Tachibana, K. Kojima, J. Nozawa

INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2014 (ICCMSE 2014)　1618　265-268　2014

DOI： 10.1063/1.4897724 　

ISSN： 0094-243X
Growth of congruent-melting lithium tantalate crystal with stoichiometric structure by MgO doping Peer-reviewed

Shunsuke Fujii, Satoshi Uda, Kensaku Maeda, Jun Nozawa, Haruhiko Koizumi, Kozo Fujiwara, Tomio Kajigaya

JOURNAL OF CRYSTAL GROWTH　383　63-66　2013/11

DOI： 10.1016/j.jcrysgro.2013.08.020 　

ISSN： 0022-0248

eISSN： 1873-5002
Vortex magnetic structure in framboidal magnetite reveals existence of water droplets in an ancient asteroid Peer-reviewed

Yuki Kimura, Takeshi Sato, Norihiro Nakamura, Jun Nozawa, Tomoki Nakamura, Katsuo Tsukamoto, Kazuo Yamamoto

NATURE COMMUNICATIONS　4　2649　2013/10

DOI： 10.1038/ncomms3649 　

ISSN： 2041-1723
The effect of grain boundary characteristics on the morphology of the crystal/melt interface of multicrystalline silicon Peer-reviewed

Kozo Fujiwara, Masaya Ishii, Kensaku Maeda, Haruhiko Koizumi, Jun Nozawa, Satoshi Uda

Scripta Materialia　69　(3)　266-269　2013/08

DOI： 10.1016/j.scriptamat.2013.04.015 　

ISSN： 1359-6462
Impurity Partitioning During Colloidal Crystallization Peer-reviewed

Jun Nozawa, Satoshi Uda, Yuhei Naradate, Haruhiko Koizumi, Kozo Fujiwara, Akiko Toyotama, Junpei Yamanaka

JOURNAL OF PHYSICAL CHEMISTRY B　117　(17)　5289-5295　2013/05

DOI： 10.1021/jp309550y 　

ISSN： 1520-6106

eISSN： 1520-5207
Improvement of crystal quality for tetragonal hen egg white lysozyme crystals under application of an external alternating current electric field Peer-reviewed

H. Koizumi, S. Uda, K. Fujiwara, M. Tachibana, K. Kojima, J. Nozawa

JOURNAL OF APPLIED CRYSTALLOGRAPHY　46　25-29　2013/02

DOI： 10.1107/S0021889812048716 　

ISSN： 0021-8898

eISSN： 1600-5767
Fabrication of Quasi-Phase-Matching Structure during Paraelectric Borate Crystal Growth Peer-reviewed

Kensaku Maeda, Satoshi Uda, Kozo Fujiwara, Jun Nozawa, Haruhiko Koizumi, Shun-ichi Sato, Yuichi Kozawa, Takahiro Nakamura

APPLIED PHYSICS EXPRESS　6　(1)　015501　2013/01

DOI： 10.7567/APEX.6.015501 　

ISSN： 1882-0778
Effect of silicon/crucible interfacial energy on orientation of multicrystalline silicon ingot in unidirectional growth Peer-reviewed

K. Fujiwara, K. Maeda, H. Koizumi, J. Nozawa, S. Uda

JOURNAL OF APPLIED PHYSICS　112　(11)　2012/12

DOI： 10.1063/1.4769742 　

ISSN： 0021-8979
Nucleation rate enhancement of porcine insulin by application of an external AC electric field Peer-reviewed

H. Koizumi, Y. Tomita, S. Uda, K. Fujiwara, J. Nozawa

JOURNAL OF CRYSTAL GROWTH　352　(1)　155-157　2012/08

DOI： 10.1016/j.jcrysgro.2012.03.006 　

ISSN： 0022-0248
Crystal and faceted dendrite growth of silicon near (100) Peer-reviewed

Xinbo Yang, K. Fujiwara, R. Gotoh, K. Maeda, J. Nozawa, H. Koizumi, S. Uda

ACTA MATERIALIA　60　(8)　3259-3267　2012/05

DOI： 10.1016/j.actamat.2012.03.010 　

ISSN： 1359-6454
Control of Gibbs free energy relationship between hen egg white lysozyme polymorphs under application of an external alternating current electric field Peer-reviewed

Y. Tomita, H. Koizumi, S. Uda, K. Fujiwara, J. Nozawa

JOURNAL OF APPLIED CRYSTALLOGRAPHY　45　(Part 2)　207-212　2012/04

DOI： 10.1107/S002188981200249X 　

ISSN： 0021-8898
The critical growth velocity for planar-to-faceted interfaces transformation in SiGe crystals Peer-reviewed

Xinbo Yang, K. Fujiwara, N. V. Abrosimov, R. Gotoh, J. Nozawa, H. Koizumi, A. Kwasniewski, S. Uda

APPLIED PHYSICS LETTERS　100　(14)　141601-141601　2012/04

DOI： 10.1063/1.3698336 　

ISSN： 0003-6951
Formation mechanism of cellular structures during unidirectional growth of binary semiconductor Si-rich SiGe materials Peer-reviewed

Raira Gotoh, Kozo Fujiwara, Xinbo Yang, Haruhiko Koizumi, Jun Nozawa, Satoshi Uda

APPLIED PHYSICS LETTERS　100　(2)　021903-021903　2012/01

DOI： 10.1063/1.3675860 　

ISSN： 0003-6951
Formation mechanism of twin boundaries in lithium tetraborate Peer-reviewed

K. Maeda, K. Fujiwara, J. Nozawa, H. Koizumi, S. Uda

JOURNAL OF CRYSTAL GROWTH　331　(1)　78-82　2011/09

DOI： 10.1016/j.jcrysgro.2011.07.018 　

ISSN： 0022-0248
Control of Effect on the Nucleation Rate for Hen Egg White Lysozyme Crystals under Application of an External ac Electric Field Peer-reviewed

H. Koizumi, S. Uda, K. Fujiwara, J. Nozawa

LANGMUIR　27　(13)　8333-8338　2011/07

DOI： 10.1021/la2010985 　

ISSN： 0743-7463
Morphological transformation of a crystal-melt interface during unidirectional growth of silicon Peer-reviewed

K. Fujiwara, R. Gotoh, X. B. Yang, H. Koizumi, J. Nozawa, S. Uda

ACTA MATERIALIA　59　(11)　4700-4708　2011/06

DOI： 10.1016/j.actamat.2011.04.016 　

ISSN： 1359-6454
Magnetite 3D Colloidal Crystals Formed in the Early Solar System 4.6 Billion Years Ago Peer-reviewed

Jun Nozawa, Katsuo Tsukamoto, Willem van Enckevort, Tomoki Nakamura, Yuki Kimura, Hitoshi Miura, Hisao Satoh, Ken Nagashima, Makoto Konoto

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY　133　(23)　8782-8785　2011/06

DOI： 10.1021/ja2005708 　

ISSN： 0002-7863

eISSN： 1520-5126
Dependence of Si-Faceted Dendrite Growth Orientation on Twin Spacing and Undercooling Peer-reviewed

Xinbo Yang, K. Fujiwara, K. Maeda, J. Nozawa, H. Koizumi, S. Uda

CRYSTAL GROWTH & DESIGN　11　(4)　1402-1410　2011/04

DOI： 10.1021/cg101721v 　

ISSN： 1528-7483
Dependence of Si faceted dendrite growth velocity on undercooling Peer-reviewed

Xinbo Yang, K. Fujiwara, K. Maeda, J. Nozawa, H. Koizumi, S. Uda

APPLIED PHYSICS LETTERS　98　(1)　2011/01

DOI： 10.1063/1.3543623 　

ISSN： 0003-6951
Dependence of si-faceted dendrite growth orientation on twin spacing and undercooling Peer-reviewed

Yang, X., Fujiwara, K., Maeda, K., Nozawa, J., Koizumi, H., Uda, S.

Crystal Growth and Design　11　(4)　012113-1410　2011

DOI： 10.1021/cg101721v 　

ISSN： 1528-7483 1528-7505
Effect of various precipitants on the nucleation rate of tetragonal hen egg-white lysozyme crystals in an AC external electric field Peer-reviewed

H. Koizumi, S. Uda, K. Fujiwara, J. Nozawa

JOURNAL OF CRYSTAL GROWTH　312　(23)　3503-3508　2010/11

DOI： 10.1016/j.jcrysgro.2010.09.006 　

ISSN： 0022-0248
Effect of twin spacing on the growth velocity of Si faceted dendrites Peer-reviewed

Xinbo Yang, Kozo Fujiwara, Raira Gotoh, Kensaku Maeda, Jun Nozawa, Haruhiko Koizumi, Satoshi Uda

APPLIED PHYSICS LETTERS　97　(17)　2010/10

DOI： 10.1063/1.3501974 　

ISSN： 0003-6951
FORMATION OF COSMIC CRYSTALS IN HIGHLY SUPERSATURATED SILICATE VAPOR PRODUCED BY PLANETESIMAL BOW SHOCKS Peer-reviewed

H. Miura, K. K. Tanaka, T. Yamamoto, T. Nakamoto, J. Yamada, K. Tsukamoto, J. Nozawa

ASTROPHYSICAL JOURNAL　719　(1)　642-654　2010/08

DOI： 10.1088/0004-637X/719/1/642 　

ISSN： 0004-637X
AFM study on surface nanotopography of matrix olivines in Allende carbonaceous chondrite Peer-reviewed

Jun Nozawa, Katsuo Tsukamoto, Hidekazu Kobatake, Junya Yamada, Hisao Satoh, Ken Nagashima, Hitoshi Miura, Yuki Kimura

ICARUS　204　(2)　681-686　2009/12

DOI： 10.1016/j.icarus.2009.07.019 　

ISSN： 0019-1035
Crystallization of cosmic dust from highly supersaturated silicate vapor in a rapidly cooled environment Peer-reviewed

Hidekazu Kobatake, Katsuo Tsukamoto, Jun Nozawa, Ken Nagashima, Hisao Satoh, Peter Dold

ICARUS　198　(1)　208-217　2008/11

DOI： 10.1016/j.icarus.2008.06.006 　

ISSN： 0019-1035
3-D colloidal crystals of magnetite in the Tagish Lake carbonaceous chondrite Peer-reviewed

Jun Nozawa, Katsuo Tsukamoto, Hisao Satoh, Ken Nagashima, Kenta Yamada

GEOCHIMICA ET COSMOCHIMICA ACTA　71　(15)　A726-A726　2007/08

ISSN： 0016-7037
Measurement of Interaction Forces between Montmorillonite Particles in NaCl Solutions using a Colloidal Probe Atomic Force Microscopy Peer-reviewed

Susumu Kurosawa, Masashi Mizukami, Hisao Sato, Kazue Kurihara, Jun Nozawa, Keiichi Tsutimoto

Transactions of the Atomic Energy Society of Japan　5　(3)　251-256　2006/01

DOI： 10.3327/taesj2002.5.251 　

ISSN： 1347-2879

eISSN： 2186-2931
Morphology and the surface topography of nano-particles in meteorite matrix

Jun Nozawa, Katsuo Tsukamoto, Hisao Satoh, Hidekazu Kobatak

Grain Formation Workshop vol. 24　2004/01/01

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Misc. 30

ヘテロエピタキシーによるコロイド結晶成長—Heteroepitaxial Growth of Colloidal Crystals

野澤純

日本物理学会誌 = Butsuri　79　(6)　280-285　2024/06
Publisher: 東京 : 日本物理学会
ISSN： 0029-0181
コロイド結晶における2次元核形成過程 Invited Peer-reviewed

野澤純, 郭素霞, 胡素梦, 豊玉彰子, 山中淳平, 小泉晴比古, 岡田純平, 宇田聡

日本結晶成長学会誌　44　(2)　96-102　2017/04
Control of Crystallization process for proteins under application of an external electric field

Koizumi Haruhiko, Uda Satoshi, Okada Junpei, Nozawa Jun

Meeting Abstracts of the Physical Society of Japan　72　(0)　3212-3212　2017
Publisher: The Physical Society of Japan

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高齢化社会に対応できるゲノム創薬やテーラーメイド医療を実現するためには、タンパク質分子の立体構造の情報が必須である。そのためには、良質なタンパク質単結晶を必要とするが、タンパク質単結晶の育成は極めて難しく、この過程が構造解析の律速段階となっている。我々はこれまで、熱力学的な観点から、交流電場がタンパク質結晶化過程に与える影響を議論してきた。本発表では、交流電場によるタンパク質核形成の促進方向への制御について紹介する。
不純物添加したニオブ酸リチウムの点欠陥形態

小山千尋, 野澤純, 藤原航三, 宇田聡

日本結晶成長学会誌　43　(3)　131-138　2016/07/01
Publisher: The Japanese Association for Crystal Growth
DOI： 10.19009/jjacg.43.3_131 　

ISSN： 2188-7268

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 The defect structures of impurity-doped congruent lithium niobates (c-LN) were investigated by combining lattice constant measurements with thermodynamic analyses. On the basis of the "Li site vacancy model", six kinds of defect structures in impurity-doped c-LN are possible. Using thermodynamic constraints, these can be narrowed down to two kinds. The thermodynamic analyses showed impurities are located at only the Li or Nb site in the range where antisite niobium exists. Based on the thermodynamic analyses, lattice constant measurement revealed that divalent and trivalent impurities were located at Li sites in LN, whereas tetravalent impurities were located at Nb sites. This result provides good clues for controlling intrinsic point defects.
コロイド結晶成長中の不純物分配

野澤純, 胡素梦, 小泉晴比古, 藤原航三, 宇田聡

日本結晶成長学会誌　43　(2)　88-96　2016/04/01
Publisher: The Japanese Association for Crystal Growth
DOI： 10.19009/jjacg.43.2_88 　

ISSN： 2188-7268

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 To obtain high quality colloidal crystals, control of impurity behavior during crystallization is required. We have investigated impurity partitioning quantitatively for the colloidal crystal. We applied conventional partition model of normal crystal growth such as Thurmond and Struthers model and Burton Prim Slichter (BPS) model to colloidal crystal growth, which provides equilibrium partition coefficient (k₀). Discussion on the basis of free energy derived from volume fraction of colloidal particles well account for variation of k₀s for impurity of different size. In-situ observation revealed detailed partition behavior, including orientation-dependency, the effect of the grain boundary, and the morphology of solid-liquid interface. These new findings contribute to constructing methodology for growing high quality colloidal crystal as well as understanding general concept of partitioning that takes place during phase transition.
The 45th National Conference on Crystal Growth (NCCG-45)(News of JACG)

Journal of the Japanese Association of Crystal Growth　42　(4)　299-304　2016/01
Publisher: The Japanese Association for Crystal Growth (JACG)
ISSN： 2187-8366
The 45th National Conference on Crystal Growth (NCCG-45)(News of JACG)

佐藤元, 藤原航三, 樋口幹雄, 太子敏則, 片山竜二, 山中淳平, 鈴木良尚, 小泉晴比古, 三浦均, 野澤純, 新家寛正, 島村清史, 勝野弘康, 本間宏成, 藤原貴久, 谷口尚, 三宅秀人, 寒川義裕, 長嶋剣, 丸山美帆子, 吉川彰, 手嶋勝弥

Journal of the Japanese Association for Crystal Growth　42　(4)　299-304　2016
Publisher: 日本結晶成長学会
ISSN： 0385-6275
O10-03 タギシュレイク隕石中に見られるフランボイダルマグネタイトの形成過程(口頭発表セッション10 隕石・実験,口頭発表)

木村勇気, 佐藤岳志, 中村智樹, 中村教博, 野澤純, 塚本勝男, 山本和生

日本惑星科学会秋期講演会予稿集　2014　"O10-03"　2014/09/10
Publisher: 日本惑星科学会
交流電場を利用したタンパク質核形成過程の制御

小泉晴比古, 宇田聡, 藤原航三, 野澤純

日本結晶成長学会誌　40　98-106　2013/04/01

DOI： 10.19009/jjacg.40.2_98 　
Enhancement of Crystal Perfection for Tetragonal Hen-egg White Lysozyme Crystals under Application of an External AC Electric Field

Haruhiko Koizumi, Satoshi Uda, Kozo Fujiwara, Masaru Tachibana, Kenichi Kojima, Jun Nozawa

Photon Factory Activity Report 2011 Part B: Users' Report　29　198-1-198-2　2012
Publisher: High Energy Accelerator Research Organization (KEK)
隕石中のマグネタイトコロイド結晶

野澤純, 塚本勝男, 木村勇気, 三浦均

結晶成長国内会議予稿集(CD-ROM)　41st　ROMBUNNO.04AA04　2011

ISSN： 0385-6275
隕石中のマグネタイトのコロイド結晶

野澤純, 塚本勝男, 木村勇気, 甲野藤真

日本物理学会講演概要集　64　(2)　297　2009/08/18

ISSN： 1342-8349
28aYH-5 Magnetite colloidal crystals in the meteorite

Meeting abstracts of the Physical Society of Japan　64　(2)　297-297　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
微惑星衝撃波による珪酸塩微結晶の形成:急冷ガスからの直接凝縮

三浦均, 田中今日子, 山本哲生, 中本泰史, 山田淳也, 塚本勝男, 野澤純

日本天文学会年会講演予稿集　2009　146　2009/02/20

ISSN： 1347-0639
Colloidal crystallization of magnetite particles in the meteorite

NOZAWA JUN, TSUKAMOTO KATSUO, KONOTO MAKOTO, KIMURA YUKI

結晶成長国内会議予稿集　39th　186　2009

ISSN： 0385-6275
P106 Production of supersaturated silicate vapor by nebula shock : sizes and morphologies of condensates

Miura Hitoshi, Tanaka Kyoko K, Yamamoto Tetsuo, Nakamoto Taishi, Nozawa Jun, Tsukamoto Katsuo, Yamada Junya

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2008　99-99　2008/11/01
Publisher: The Japanese Society for Planetary Sciences

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We carried out a numerical simulation of shock-wave heating event in early solar system. A shock wave heats and evaporates micron-sized silicate dust particles and generates a dust vapor. We found that the dust vapor cools to be supersaturated behind the shock front. The typical size and the morphology of condensates were discussed based on the classical nucleation theory.
Step formation of vapor growth magnetite

YAMADA KENTA, NOZAWA JUN, TSUKAMOTO KATSUO, SATO HISAO

結晶成長国内会議予稿集　38th　140　2008

ISSN： 0385-6275
Origin of the magnetite colloidal crystals in the meteorite

NOZAWA JUN, TSUKAMOTO KATSUO, YAMADA KENTA

結晶成長国内会議予稿集　38th　148　2008

ISSN： 0385-6275
In-situ observation of dissolution and colloidization of smectite crystal

SATO HISAO, NOZAWA JUN, TSUKAMOTO KATSUO

結晶成長国内会議予稿集　38th　151　2008

ISSN： 0385-6275
Vapor Growth of Silicate Crystals in Early Solar System: Numerical Simulation of Shock-Wave Heating Event

MIURA HITOSHI, TANAKA KYOKO, YAMAMOTO TETSUO, NAKAMOTO TAISHI, NOZAWA JUN, TSUKAMOTO KATSUO, YAMAMOTO JUN'YA

結晶成長国内会議予稿集　38th　147　2008

ISSN： 0385-6275
Origin of colloid crystal of magnetite particles

YAMADA KENTA, NOZAWA JUN, TSUKAMOTO KATSUO

結晶成長国内会議予稿集　37th　80　2007

ISSN： 0385-6275
Surface Topography of cobble structure on alpha-quartz

NOZAKI SOICHIRO, TSUKAMOTO KATSUO, NOZAWA JUN

結晶成長国内会議予稿集　37th　85　2007

ISSN： 0385-6275
隕石マトリックスオリビン微粒子形態の成長条件依存性

山田淳也, 小畠秀和, 野澤純, 塚本勝男

日本惑星科学会秋季講演会予稿集　2007　74　2007

DOI： 10.14909/jsps.2007f.0.74.0 　
02aB09 Colloidal crystals formed 4.6 billion years ago(NCCG-36)

Nozawa Jun, Tsukamoto Katsuo, Satoh Hisao, Nagashima Ken

Journal of the Japanese Association of Crystal Growth　33　(4)　279-279　2006/11/01
Publisher: The Japanese Association for Crystal Growth (JACG)
DOI： 10.19009/jjacg.33.4_279 　

ISSN： 0385-6275

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Fine particles of magnetite frequently occur in some primitive meteorites which experienced aqueous alteration. We newly found that the colloidal crystals composed of 〜150nm diameter of magnetite particles have bcc structure and 200nm have fcc structure. The fcc colloidal magnetite crystals consist entirely of anomalous morphology. The structure of colloidal crystal dependent on the size and morphology could reflect the formation environments on the immature parental body with ice-water evaporation.
03aC07 Formation Condition of Olivine Fine Particle Surface Composing Meteorite(NCCG-36)

Yamada J, Tsukamoto K, Satoh H, Hidekazu H, Nozawa J

Journal of the Japanese Association of Crystal Growth　33　(4)　330-330　2006/11/01
Publisher: The Japanese Association for Crystal Growth (JACG)
DOI： 10.19009/jjacg.33.4_330 　

ISSN： 0385-6275

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Formation process of matrix olivine surface microtopography was experimentally simulated Few μm sized 2-dimentional nucleation growth islands were observed on the surface. It was thought that the difference of the shape of step between sharp and rough depends on whether supersaturation excess the critical supersaturation or not Our experiment indicates that some matrix olivine remained the record that they cooled rapidly more than 500K/sec.
いん石中のolivine微結晶表面に残された46億年前のらせんステップ

野沢純, 塚本勝男, 佐藤久夫, 小畠秀和

日本鉱物学会年会・日本岩石鉱物鉱床学会学術講演会講演要旨集　2005　89-72　2005/09
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/kobutsu.2005.0.72.0 　

ISSN： 1348-6543
19aC10 Spiral Steps formed 4.6 billion years ago on Meterorites(NCCG-35)

Nozawa Jun, Tsukamoto Katsuo, Satoh Hisao, Kobatake Hidekazu

Journal of the Japanese Association of Crystal Growth　32　(3)　270-270　2005/08/17
Publisher: The Japanese Association for Crystal Growth (JACG)
DOI： 10.19009/jjacg.32.3_270 　

ISSN： 0385-6275

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Growth steps on the olivine (001) were observed in the matrix of a primitive carbonaceous chondrite using FE-SEM (Field Emission Scanning Electron Microscope) and AFM (Atomic Force Microscope). These steps are regarded to be formed at first from vapor and then from melt via liquid phase (VLS), which indicates that early solar nebula was very dynamic condition such as generating locally rapid heating or cooling.
25pC03 Growth steps on the olivine fine particles in chondrite(NCCG-34)

Nozawa Jun, Tsukamoto Katsuo, Satoh Hisao, Kobatake Hidekazu

Journal of the Japanese Association of Crystal Growth　31　(3)　155-155　2004/08/25
Publisher: The Japanese Association for Crystal Growth (JACG)
DOI： 10.19009/jjacg.31.3_155 　

ISSN： 0385-6275

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Growth steps on the olivine (001) were observed in the matrix of a primitive carbonaceous chondrite using FE-SEM (Field Emission Scanning Electron Microscope) and AFM (Atomic Force Microscope). The lowest step height was measured to be 1.2nm which approximately corresponds to double of the elementary steps (0.59nm) on the (001). Such a step could be developed during vapor-growth in the free space. Thus, microtopography can evaluate the formation conditions of cosmic materials which were formed at 4.6 billions years ago.
微小重力を利用した惑星起源物質の形成シミュレーション

小畠秀和, 塚本勝男, 横山悦郎, 佐藤久夫, 野澤純

日本マイクログラビティ応用学会誌　20　(2)　137-144　2003
The dependence of the Inter Planetary Dust particles morphology on their growth condition

Kobatake H, Tsukamoto K, Nozawa J, Nagashima K, Satoh H

Journal of the Japanese Association of Crystal Growth　29　(2)　104-104　2002/07/01
Publisher: The Japanese Association for Crystal Growth (JACG)
DOI： 10.19009/jjacg.29.2_104 　

ISSN： 0385-6275

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To understand the environment of the early solar system, we have investigated the relation between the growth condition and dust morphology. The aggregation behaviors of SiO_2 glass indicate that high oxygen fugacity increases the interfacial free energy of the dust particles. The forsterite morphology indicates that the dust condensation condition in the early solar system was about 200 K below from its equilibrium temperature.

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Books and Other Publications 1

コロイド結晶の形成とその応用

中村, 浩, 山中, 淳平

シーエムシー出版　2020/05

ISBN: 9784781315027

Presentations 5

コロイドヘテロエピタキシャル成長における多形転移と結晶成長プロセス

野澤純

結晶表面での相転移ダイナミクスのその場観察と理論の新展開　2024/01/16
Heteroepitaxial fabrication of binary colloidal crystals by a balance of interparticle interaction and lattice spacing

Jun Nozawa, Koya Shibata, Kozo Fujiwara

2023/09/05
Polymorph transition-mediated non-classical nucleation and growth in the colloidal heteroepitaxial growth

Jun Nozawa, Koya Shibata, Satoshi Uda, Kozo Fujiwara

2023/07/31
コロイドヘテロエピタキシャル成長における多形転移と核形成挙動

野澤純, 柴田航也, 藤原航三

2023年地球惑星連合大会　2023/05/21
コロイドヘテロエピタキシャル成長における多形転移と結晶成長

野澤純, 宇田聡, 藤原航三

第51回結晶成長国内会議　2023/12/04

Research Projects 10

高効率熱電材料のための2元系ナノ粒子構造による新規フォノニック結晶の開発

Offer Organization: 公益財団法人プロテリアル材料科学財団

2024/04 - 2025/03
高効率熱電材料のための2元系ナノ粒子構造による新規フォノニック結晶の開発

Offer Organization: 公益財団法人泉科学技術振興財団

2023/10 - 2025/03
異種結晶基板を利用したコロイド準結晶の創製

Offer Organization: 住友電工グループ社会貢献基金

2021/11 - 2022/10
Fabrication of high quality colloidal crystals by tuning interparticle interaction

Nozawa Jun

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2018/04/01 - 2021/03/31

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Colloidal crystals are expected to be used for innovative optical devices such as photonic crystals. The detailed mechanisms of nucleation and crystal growth of colloidal crystals have been clarified by in-situ observation, which is critical for growing high-quality crystals. We have succeeded in understanding the fundamental phenomena of crystal growth, such as two-dimensional nucleation on the cover glass and on the crystal surface, relation between step velocity and kink formation mechanism. In addition, we found an important growth mode in binary colloidal crystals consisting of two particles with different sizes, which can be used to control the structure and crystallization phase.
異種結晶基板を利用した新規2元系コロイド結晶成長法の開拓

Offer Organization: 村田学術振興財団

2019/04 - 2020/03
コロイダルヘテロエピタキシーによる新規コロイド結晶成長法の確立

Offer Organization: 池谷科学技術振興財団

2019/04 - 2020/03
Impurity partitioning during colloidal crystallization revealed by fluorescent particles

NOZAWA Jun

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2014/04/01 - 2016/03/31

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A colloidal crystal, periodic array of colloidal particles, is a promising material that can be applied to various novel functional devices such as photonic crystals. However, there are some issues to be overcome for practical application, an impurity incorporation is one of critical problem. The detailed mechanism of impurity partitioning during colloidal crystallization has been revealed by using fluorescent particles in the present study. Orientation-dependent impurity partitioning and effect of grain boundary on partitioning was investigated quantitatively. These new findings significantly contribute to the control of impurity during colloidal crystallization.
Growth of lithium tetraborate with periodic twin structure formed by applying an electric current during growth for the use of deep-ultraviolet light laser

UDA Satoshi, SHOJI Ichiro, NOZAWA Jun, KENSAKU Maeda

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04 - 2015/03

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We have succeeded in the growth of lithium tetraborate with periodic twin structure forming during growth by applying an electric field or manipulating a growth orientation relative to the twin boundary. Since lithium tetraborate is not ferroelectric, the conventional method for the formation of the quasi-phase matching structure (QPM) is not possible. By revealing the formation mechanism of (100) and (010) twins, we managed alternative twin formation with these orientations, which made the periodic twin structure with small period. This structure can be served as a QPM structure and the secondary harmonic generation of Nd:YAG laser was successfully obtained. It is a remarkable result that the QPM formation is possible for non-ferroelectric material.
Optimum composition of LiNbO_3 that satisfies its stoichiometry and congruency

UDA Satoshi, TANIUCHI Tetsuo, NOZAWA Jun

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2010 - 2011

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A new LiNbO_3 bulk crystal (cs-MgO : LiNbO_3)has been developed by including MgO combined with vacancy and the crystal successfully has the congruent point coincident with the stoichiometric point. Activities of all crystal-constituent elements including Mg and vacancy are unity. The cs-MgO : LiNbO_3 has a much more homogeneous composition than the conventional LiNbO_3 crystals and its SHG conversion efficiency is comparable to the optimum value reported.
表面観察による隕石を構成する微粒子の形成・集積過程の解明

野澤純

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東北大学

2007 - 2008

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前年度までで、隕石中のマグネタイトについてSEMによる形体、粒径、産状の観察、TEMによる鉱物同定、内部組織の観察などを行った。これらの観察により隕石中に初めてマグネタイトからなるコロイド結晶が存在している事が示された。このコロイド結晶の存在は特に二つの点で非常に興味深い。一つ目は、コロイド結晶は現在、コロイド科学、材料科学の中で最先端のトピックの一つであるが、それが太陽系が形成した直後の46億年も前に既にできていたという事である。二つ目はマグネタイト粒子が規則正しく配列している事である。これまで、地球科学の分野ではこのような粒子の集合体は粒子同士の引力で形成されると考えられてきたが、溶液中でのコロイド粒子の規則配列は粒子同士の相互作用が斥力の時に起きる。ここで、マグネタイトは磁気を持つために粒子同士の相互作用は強い引力であるので規則配列することは予想されない。マグネタイトのコロイド結晶化には磁気が非常に大きな影響を及ぼしているので、隕石中のマグネタイト粒子の磁気の状態が実際どのようになっているのか世界に数台しかない産業技術総合研究所のSpin-SEMを用いて観察を行った。その結果、通常のマグネタイトで報告例のない粒子内で磁束が閉じたような構造を持つ可能性が示された。この事から、粒子同士の相互作用が強い引力にはならずにコロイド結晶が形成した事が考えられる。これらの結果は惑星科学だけでなく、ナノ磁性粒子やコロイド科学の分野において非常に大きなインパクトを与えた。

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