Kent State University Liquid Crystal Institute-- Hiroshi Yokoyama

Prof. Yokoyama is a world expert in the field of liquid crystal physics with a focus on the surface properties. His primary research interests are in the areas of liquid crystals, surface and colloid science, organic thin films and scanning probe technology.Yokoyama received his Doctor of Enginnering (1987) from the Tokyo Institute of Technology. Before joining the Liquid Crystal Institute, he was the director of Nanotechnology Research Institute (NRI), National Institute of Advanced Industrial Science and Technology(AIST). He joined the LCI staff in July 2009 as an Ohio Research Scholar and professor in the Chemical Physics graduate program. His research effort at the LCI will be associated with the recently funded by the State of Ohio’s Third Frontier Project entitled Research Cluster on Surfaces in Advanced Materials (RC-SAM). RC-SAM is the partnership of Kent State University, Case Western Reserve University, Youngstown State University, Alpha Micron, Inc., Cleveland Botanical Garden, CoAdna Photonics, Inc., Kent Displays, Inc., Kent Optronics, Inc., and LXD, Inc.

Professor Yokoyama's web site:
http://www.nanolog.jp/mysite/index.html

Education

Doctor of Engineering, Tokyo Institute of Technology, 1987
(Orientational Phenomena at Nematic Liquid Crystal Surfaces and their Applications)

MA Engineering, Physical Electronics, Tokyo Institute of Technology, 1979

Employment

2009- present Professor & Ohio Research Scholar, Liquid Crystal Institute, Kent State University

2008 - 2009 Chief Scientist, Nanotechnology Research Institute, AIST

2008 - 2008 Visiting Professor, Tokyo Institute of Technology

2004 - 2007 CTO, NanoSystem Solutions, Inc.

2004 - 2008 Director, Liquid Crystal NanoSystem Project, ERATO/SORST, JST

2001 - 2008 Director, Nanotechnology Research Institute, AIST

1999 - 2004 Project Director, Yokoyama Nanostructured Liquid Crystal Project, ERATO, JST

1996 - 2004 Visiting Professor, Tokyo University of Science

1992 - 2001 Chief, Molecular Physics Section, Supramolecular Science Division, Electrotechnical Laboratory

1992 - 1993 Visiting Professor, Tokyo University of Agriculture and Technology

1988 Senior Researcher, Electrotechnical Laboratory

1987 - 1988 Visiting Scientist, AT&T Bell Laboratories

1979 Researcher, Electronic Chemistry Section, Electrotechnical Laboratory

Academic Activities

Society Membership:
Japan Society of Applied Physics, Fellow
The Physical Society of Japan, Member
The Japanese Liquid Crystal Society, Member
American Physical Society, Life Member
Institute of Physics, Fellow
International Liquid Crystal Society, Life Member

Journals:
2009 - present Journal of Physics: Condensed Matter, Member, Editorial Board
2008 - present The European Physical Journal E - Soft Matter and Biological Physics , Associate Editor
2001 - 2007 Nanotechnology, Regional Editor for Asia
1996 - present Molecular Crystals and Liquid Crystals (MCLC), Editorial Advisory Board
1999 - 2001 Japanese Journal of Applied Physics (JJAP), Editor-in-Chief
1993 - 1998 Japanese Journal of Applied Physics (JJAP), Associated Editor

Committee and Consultancy:
2008 - present King Abdullah Institute for Nanotechnology (KAIN), King Saud University, Saudi Arabia, Member, International Advisory Board
2006 - 2008 National Nanotechnology Center, NSTDA, Thailand, Member, International Advisory Board
2004 - present Asia Nano Forum (ANF), Member, Board of Executive Directors
2004 - present Expert Panel on Management of Intellectual Properties, Council for Science and Technology Policy (CSTP), Member
2004 - present Asia Nano Forum, Executive Committee Member
2003 - present 147 Committee for Amorphous and Nano Materials, JSPS, Member
2002 - 2004 Institute for Pure and Applied Physics(IPAP), Member, Executive Board
2001 - 2007 Japan Society of Applied Physics, Member, Advisory Board
2001 - present nano tech Organization Committee, Member
2000 - 2001 Japan Society of Applied Physics, Member, Executive Board
2000 - 2001 Physical Society of Japan, Member, Publication Committee
1999 - present 142 Committee for Organic Materials for Information Processing, JSPS, Chair, Division A for Liquid Crystals
1999 - 2001 Japanese Liquid Crystal Society (JLCS), Executive Director
1998 - present 167 Committee for Nanoprobe Technology, Member
1997 - 1998 Japanese Liquid Crystal Society, Member, Advisory Board
1996 - 1998 The Institute of Electrical Engineers of Japan, Chair, Research Committee for Active Organic Materials
1995 - 1999 Japan Electronics and Information Technology Industries Association (JEITA) Secretary, Committee for Electronics Materials
1995 - present The Japanese Research Association for Organic Electronics Materials(JOEM)Member of Executive Board
1995 - 1997 Japan Society of Applied Physics (JSAP), Editorial Board Member
1994 - 1995 Japan Society of Applied Physics @Division for Molecular Electronics and Bioelectronics Secretary in Chief
1994 - 1998 International Liquid Crystal Society (ILCS) Member of Executive Board
1992 - 1995 Japan Society of Applied Physics @Division for Molecular Electronics and Bioelectronics Secretary
1990 - 1994 Japan Society of Applied Physics @Division for Molecular Electronics and Bioelectronics@Representative
1989 - 1999 Japan Technology Transfer Association(JITTAS) @Committee for Information Display Technology, Secretary
1986 - 1987 Physical Society of Japan Division for Molecular Crystals, Liquid Crystals and Organic Semiconductors, Secretary

International Conferences:
2001 - International Display Workshops (IDW)
2004 - 13th International Conference on Scanning Tunneling Microscopy/Spectroscopy and Related Techniques Member, International Advisory Board
2003 - 2004 Member, Organization Committee, "Trend in Nanotechnology"
2000 - 2004 International Liquid Crystal Conference (ILCC), Member of International Advisory Board
2004 LASE 2004: SYNTHESIS AND PHOTONICS OF NANOSCALE MATERIALS II Member, Program Committee
1996 - 2002 18th International Liquid Crystal Conference, ILCC2000, Chair, Scientific Committee
1995 - 2001 International Display Workshops, Chairman, Workshop on Liquid Crystal Science and Technologies
2002 LASE 2002: Nanoscience using Laser-Solid InteractionsMember, Program Committee
1996 Tsukuba Workshop on Scanning Probe-based Nanoelectronics, SP-Nano '96 Chair, Organizing Committee
1994 - 1996 16th International Liquid Crystal Conference (ILCC), Member, Scientific Committee

Books

"Handbook of Liquid Crystal Research" edited by P.J. Collings and J.S. Patel, Oxford Univ. Press, New York, 1997, Chapter 6.

2009
239 J. Niitsuma, M. Yoneya and H. Yokoyama: "Improved Micro-Photopatterning on Azo Film for a Practical Nematic Liquid Crystal Bistability" Jpn. J. Appl. Phys. 48, 040201(2009).

238 I. Nishiyama, J. Yamamoto and H. Yokoyama: "Molecular Organization Realized by Soft Character of Smectic Layer " Mol. Cryst. Liq. Cryst. 498, 19(2009).

237 T. Yamamoto, Y. Tabe and H. Yokoyama: "Manipulation of Defect Structures and Colloidal Chains in Liquid Crystals by Means of Photochemical Reactions of Azobenzene Compounds " Mol. Cryst. Liq. Cryst. 498, 1(2009).

236 J. Fukuda, M. Yoneya and H. Yokoyama: "Consistent numerical evaluation of the anchoring energy of a grooved surface " Phys. Rev. E 79, 011705(2009).

2008
235 J. Niitsuma, M. Yoneya and H. Yokoyama: "Contact photolithographic micropatterning for bistable nematic liquid crystal displays" Appl. Phys. Lett. 92, 241120(2008).

234 J. Seog. Gwag, J. Hoon. Kim, M. Yoneya and H. Yokoyama: "Surface nematic bistability at nanoimprinted topography" Appl. Phys. Lett. 92, 153110 (2008).

233 M. Yoneya, Y. Tabe and H. Yokoyama: "Molecular dynamics simulation study of gas transport through chiral liquid crystalline monolayer" Ferroelectrics 365, 297(2008).

232 T. Yamamoto, I. Nishiyama and H. Yokoyama: "Photo-control of chirality-induced liquid-crystalline 3D structures" Ferroelectrics 365, 197(2008).

231 M. Yoneya, T. Yamamoto, I. Nishiyama and H. Yokoyama: "Molecular dynamics simulation study of the influence of chirality on the stability of the smectic Q liquid crystal phase" J. Phys. Chem. 112, 8452(2008).

230 M. Yoneya, S. Takada, Y. Maeda and H. Yokoyama: "Electro-optic response of cubic liquid crystal compounds in Kerr cell geometry" Liq. Cryst. 35, 339(2008).

229 M. Oh-e, H. Yokoyama, M. Koeberg, E. Hendry and M. Bonn: "Liquid Crystal Colloids Studied by THz Time-Domain Spectroscopy" Mol. Cryst. Liq. Cryst. 480, 21(2008).

228 J. Seog. Gwag, M. Oh-e, K. R. Kim, M. Yoneya, H. Yokoyama, S. Itami and H. Satou: "A functionally separated nanoimprinting material tailoredf or homeotropic liquid crystal alignment" Nanotechnology 19, 395301(2008).

227 B. Lev, B. Chernyshuk, T. Yamamoto, J. Yamamoto and H. Yokoyama: "Photochemical switching between colloidal photonic crystals at the nematic-air interface" Phys. Rev. E 78, 020701(2008).

226 J. Fukuda, M. Yoneya and H. Yokoyama: "Anchoring of a nematic liquid crystal induced by surface grooves: A numerical study" Phys. Rev. E 77, 030701(2008).

225 J. Fukuda, J. Seog. Gwag, M. Yoneya and H. Yokoyama: "Theory of anchoring on a two-dimensionally grooved surface" Phys. Rev. E 77, 011702(2008).

2007
224 J. Seog. Gwag, J. Fukuda, M. Yoneya and H. Yokoyama: "In-plane bistable nematic liquid crystal devices based on nanoimprinted surface relief " Appl. Phys. Lett. 91, 073504(2007).

223 T. Yamamoto, I. Nishiyama and H. Yokoyama: "Novel photoinduced phase transition observed in three-dimensional liquid-crystalline phase of azobenzene compound " Chem. Lett. 36, 1108(2007).

222 J. Seog. Gwag, M. Oh-e, M. Yoneya, H. Yokoyama, H. Satou and S. Itami: "Advanced nanoimprint lithography using a graded functional imprinting material tailored for liquid crystal alignment " J. Appl. Phys. 102, 063501(2007).

221 J. H. Kim and H. Yokoyama: "Dielectric and flexoelectric responses of neimatic liquid crystals on circularly orientating patterns " Jpn. J. Appl. Phys. 46, 1617(2007).

220 Y. Maeda, H. Yokoyama, A. Yoshizawa and T. Kusumoto: "Phase behaviour under pressure of a dichiral liquid crystal with an optically isotropic cubic phase: 2-{4-[(R)-2-fluorohexyloxy]phenyl}-5-{4-[(S)-2-fluoro-2-methyldecanoyloxy]phenyl}pyrimidine " Liq. Cryst. 34, 9(2007).

219 T. Yamamoto, H. Yokoyama and Y. Tabe: "Light-induced transformation of defect structures in photochromic liquid-crystal emulsions" Mol. Cryst. Liq. Cryst. 478, 967(2007).

218 J. Fukuda and H. Yokoyama: "Effect of an external field on the director profile of a nematic liquid crystal around a spherical particle" Mol. Cryst. Liq. Cryst. 475, 165(2007).

217 H. Kuramochi, T. Tokizaki, K. Ando, H. Yokoyama and J. A. Dagata: "Why nano-oxidation with carbon nanotube probes is so stable: II. Bending behaviour of CNT probes during nano-oxidation " Nanotechnology 18, 135704(2007).

216 H. Kuramochi, T. Tokizaki, H. Yokoyama and J. A. Dagata: "Why nano-oxidation with carbon nanotube probes is so stable: I. Linkage between hydrophobicity and stability " Nanotechnology 18, 135703(2007).

215 C. Voeltz, Y. Maeda, Y. Tabe and H. Yokoyama: "Air tube formation at the freezing transition in nematic liquid crystals" Phys. Rev. E 75, 031702(2007).

214 J. Fukuda, M. Yoneya and H. Yokoyama: "Surface-groove-induced azimuthal anchoring of a nematic liquid crystal: Berreman's model reexamined" Phys. Rev. Lett. 98, 187803 (2007).

2006
213 H. Kuramochi, K. Ando, T. Tokizaki and H. Yokoyama: "Self-synchronized voltage pulse application for dynamic force microscope nano-oxidation " Appl. Phys. Lett. 88, Art. No. 093109(2006).

212 A. Yamaguchi, Y. Maeda, H. Yokoyama and A. Yoshizawa: "Self-assembly of amphiphilic liquid-crystalline oligomers possessing a semiperfluorinated alkyl chain " Chem. Mater. 18, 5704(2006).

211 J. Fukuda and H. Yokoyama: "Stability of the director profile of a nematic liquid crystal around a spherical particle under an external field" Eur. Phys. J. E 21, 341(2006). [Citing Papers by Google] *)

210 K. M. Aoki, M. Yoneya and H. Yokoyama: "Constant surface-tension molecular-dynamics simulation methods for anisotropic systems " J. Chem. Phys. 124, 064705(2006).

209 H. Kuramochi, K. Ando, T. Tokizaki and H. Yokoyama: "Reduced humidity effects on probe nano-oxidation investigated using dynamic force microscope " Jpn. J. Appl. Phys. 45, 2018(2006). [Citing Papers by Google] *)

208 Y. Maeda, E. Nishikawa and H. Yokoyama: "Morphological phase behaviour under pressure of polycatenar mesogens with a perfluorinated moiety " Liq. Cryst. 33, 865(2006).

207 A. Yoshizawa, M. Kurachi, Y. Kohama, H. Dewa, K. Yamamoto, I. Nishiyama, T. Yamamoto, J. Yamamoto and H. Yokoyama: "Synthesis and physical properties of alpha-(4-cyanobiphenyl-4 '-yloxy)-omega-[4-(5-alkylpyrimidine-2-yl)phenyloxy]alkanes " Liq. Cryst. 33, 611(2006).

206 M. Oh-e, H. Yokoyama, M. Koeberg, E. Hendry and M. Bonn: "High-frequency dielectric relaxation of liquid crystals: THz time-domain spectroscopy of liquid crystal colloids " Optics Express 14, 11433(2006). [Citing Papers by Google] *)

205 J. Fukuda, M. Yoneya and H. Yokoyama: "Numerical treatment of the dynamics of a conserved order parameter in the presence of walls " Phys. Rev. E 73, 066706(2006).

204 C. Voeltz, Y. Maeda, Y. Tabe and H. Yokoyama: "Director-configurational transitions around microbubbles of hydrostatically regulated size in liquid crystals " Phys. Rev. Lett. 97, 227801(2006).

203 Y. Maeda and H. Yokoyama: "Pressure-scanning DTA measurements of the cubic-smectic C phase transition of 1,2-bis-(4-n-octyloxy)- and 1,2-bis-(4-n-dodecyloxy benzoyl)hydrazines " Thermochimica Acta 441, 156(2006).

202 T. Yamamoto, Y. Tabe and H. Yokoyama: "Photonic manipulation of topological doped with azober defects in liquid-crystal emulsions zene derivatives " Thin Solid Films 509, 81(2006).

2005
201 N. Yamazaki, S. Kojima and H. Yokoyama: "Biomedical nanotechnology for active drug delivery systems by applying sugar-chain molecular functions" Current Applied Physics 5, 112(2005). [Citing Papers by Google] *)

200 A. Yamaguchi, I. Nishiyama, J. Yamamoto, H. Yokoyama and A. Yoshizawa: "Unusual smectic phases organized by novel lambda-shaped mesogenic molecules " J. Mat. Chem. 15, 280(2005). [Citing Papers by Google] *)

199 V. Biju, Y. Makita, T. Nagase, Y. Yamaoka, H. Yokoyama, Y. Baba and M. Ishikawa: "Subsecond luminescence intensity fluctuations of single CdSe quantum dots " J. Phys. Chem. B 109, 14350(2005). [Citing Papers by Google] *)

198 V. Biju, Y. Makita, A. Sonoda, H. Yokoyama, Y. Baba and M. Ishikawa: "Temperature-sensitive photoluminescence of CdSe quantum dot clusters " J. Phys. Chem. B 109, 13899(2005). [Citing Papers by Google] *)

197 J. Yamamoto, I. Nishiyama and H. Yokoyama: "Phase transition between fluid and elastic smectic blue phases " J. Phys. Condensed Matter 17, S2867(2005).

196 H. Kuramochi, H. Akinaga, Y. Semba, N. Kijima, T. Uzumaki, M. Yasutake, A. Tanaka and H. Yokoyama: "CoFe-Coated carbon nanotube probes for magnetic force microscope " Jpn. J. Appl. Phys. 44, 2079(2005). [Citing Papers by Google] *)

195 Y. Maeda, H. Yokoyama and S. Kumar: "Phase behaviour of three homologues of the discotic hexa-n-alkoxyanthraquinones under pressure " Liq. Cryst. 32, 833(2005). [Citing Papers by Google] *)

194 E. Nishikawa, J. Yamamoto and H. Yokoyama: "Polycatenar mesogens with a perfluorinated moiety showing a variety of liquid crystalline polymorphism " Liq. Cryst. 32, 585(2005).

193 K. Murata, J. Matsumoto, A. Tezuka, Y. Matsuba and H. Yokoyama: "Super-fine ink-jet printing: toward the minimal manufacturing system " MICROSYSTEM TECHNOLOGIES 12, 2(2005). [Citing Papers by Google] *)

192 I. Nishiyama, J. Yamamoto, J. W. Goodby and H. Yokoyama: "Chiral smectics: Molecular design and superstructures " Mol. Cryst. Liq. Cryst. 443, 25(2005). [Citing Papers by Google] *)

191 A. Yamaguchi, A. Yoshizawa, I. Nishiyama, J. Yamamoto and H. Yokoyama: "Influence of the alkyl spacer length on the phase transition behaviour of the lambda-shaped liquid crystal " Mol. Cryst. Liq. Cryst. 439, 1951(2005).

190 I. Nishiyama, T. Yamamoto, J. Yamamoto, H. Yokoyama and J. W. Goodby: "Molecular design controlling smectic stability and clinicity " Mol. Cryst. Liq. Cryst. 439, 1921(2005).

189 H. Furue, Y. Koizumi, J. Hatano and H. Yokoyama: "Molecular alignment structure and switching of a ferroelectric liquid crystal stabilized by a polymer network created in the SmA phase " Mol. Cryst. Liq. Cryst. 437, 1439(2005). [Citing Papers by Google] *)

188 M. Oh-e, H. Yokoyama, S. Yorozuya, K. Akagi, M. A. Belkin and Y. R. Shen: "Chirality probed by sum-frequency vibrational spectroscopy for helically structured conjugated liquid crystalline polymers " Mol. Cryst. Liq. Cryst. 436, 1027(2005). [Citing Papers by Google] *)

187 T. Okuzono, Y. Tabe and H. Yokoyama: "A phenomenological model of photo-induced traveling waves in liquid-crystal line Langmuir monolayers " Mol. Cryst. Liq. Cryst. 435, 893(2005).

186 M. Yoneya, J. Fukuda, H. Yokoyama and H. Stark: "Effect of a hydrodynamic flow on the orientation profiles of a nematic liquid crystal around a spherical particle " Mol. Cryst. Liq. Cryst. 435, 735(2005). [Citing Papers by Google] *)

185 J. Fukuda, H. Yokoyama, M. Yoneya and H. Stark: "Interaction between particles in a nematic liquid crystal: Numerical study using the Landau-de Gennes continuum theory" Mol. Cryst. Liq. Cryst. 435, 723(2005). [Citing Papers by Google] *)

184 B. Lev and H. Yokoyama: "Theory of interaction and structure formation in liquid crystal colloids and emulsion " Mol. Cryst. Liq. Cryst. 435, 681(2005).

183 J. H. Kim, M. Yoneya and H. Yokoyama: "Fine bistable device of nematic liquid crystal realized on orientational surface patterns " Mol. Cryst. Liq. Cryst. 433, 41(2005).

182 H. Kuramochi, T. Uzumaki, A. Yasutake, A. Tanaka, H. Akinaga and H. Yokoyama: "A magnetic force microscope using CoFe-coated carbon nanotube probes " Nanotechnology 16, 24(2005). [Citing Papers by Google] *)

181 J. Yamamoto, I. Nishiyama, M. Inoue and H. Yokoyama: "Optical isotropy and iridescence in a smectic 'blue phase'" Nature 437, 525(2005). [Citing Papers by Google] *)

180 J. Fukuda, H. Stark and H. Yokoyama: "Friction drag of a spherical particle in a liquid crystal above the isotropic-nematic transition " Phys. Rev. E 72, 021701(2005). [Citing Papers by Google] *)

179 S. B. Chernyshuk, B. Lev and H. Yokoyama: "Paranematic interaction between nanoparticles of ordinary shape " Phys. Rev. E 71, 062701(2005). [Citing Papers by Google] *)

178 J. Fukuda and H. Yokoyama: "Separation-independent attractive force between like particles mediated by nematic-liquid-crystal distortions " Phys. Rev. Lett. 94, 148301(2005). [Citing Papers by Google] *)

177 Y. Maeda, T. Niori, J. Yamamoto and H. Yokoyama: "Phase behavior of banana-shaped molecules under pressure " Thermochimica Acta 431, 87(2005).

176 Y. Maeda, T. Niori, J. Yamamoto and H. Yokoyama: "Effect of pressure on phase behavior of a thermotropic cubic mesogen " Thermochimica Acta 428, 57(2005).

Background image: Schlieren Texture of Nematic Phase
Copyright photo courtesy of Dr. Mary E. Neubert.