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Annaka Masahiko Last modified date:2023.11.22

Professor / Physical Chemistry
Department of Chemistry
Faculty of Sciences

Graduate School
Undergraduate School

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Academic Degree
Doctor of Science
Country of degree conferring institution (Overseas)
Field of Specialization
Physical Chemistry for Soft Matters
Total Priod of education and research career in the foreign country
Outline Activities
"Soft matter" is a generic name for materials such as polymers,liquid crystals, colloids, emulsions and biological materials. Among the places where its presence is ubiquitous is in the food,cosmetic and electronics industries and its absence would make modern life unthinkable. The main objective of our project is to clarify the structure, formation and non-equilibrium states of the assemblies of these soft molecules under various external fields, flow fields, electric and magnetic fields, mechanical stresses and optical illuminations. We approach these questions by means of experiment, theoretical investigation and computer simulation of the structure and dynamics of mesoscopic systems.
Research Interests
  • Formation of micelle network of telechelic hydrophobically-modified water-soluble polymers and their dynamics
    keyword : hydrophobically-modified water-soluble polymers, micelle network, dynamics
  • In-situ observation of vitreous body
    keyword : vitreous body, In-situ observation
  • Development of Artificial Vitreous Substitute with Tamponade Effect
    keyword : Artificial vitreous substitute, Tamponade effect
  • Development of Injectable Intraocular Lens Materials based on Hydrogel
    keyword : Lens, Hydrogl, Injectable
  • Bioseparation
    keyword : chromatography, stimuli-responsive, micro-fluid system, Lab-on-chip
  • Structure and physical properties of Biohydrogel
    keyword : biopolymer, eye, vitreous body, cornea
  • Self-assembly of hydrophobically-modified water-soluble polymers
    keyword : hydrophobically-modified water-soluble polymers, micelle network, dynamics
  • Structural Change in Polymer Brush and Its Dynamics
    keyword : polymer brush, Coil-BrushTransition, Living Radical Polymerization
  • Physical Chemistry of Origin of Life
    keyword : Polymer, Phase Transition, Multiple Phases, Flutration, Molecular Recognition
  • Gelation Dynamics of Polysaccharide
    keyword : Polysaccharide, Gelation
Academic Activities
1. Midori Fujiki, Masaya Ito, Kell Mortensen, Shintaro Yashima, Masayuki Tokita, and Masahiko Annaka, Friction Coefficient of Well-Defined Hydrogel Networks, Macromolecules, 49, 2, 634-642, 2016.06.
2. Annaka Masahiko, Salt effect on microscopic structure and stability of colloidal complex obtained from neutral/polyelectrolyte block copolymer and oppositely charged surfactant, Colloid and Surface B, Biointerface, 99, 127-135, 2012.11.
3. Masahiko Annaka, Kell Mortrensen, Toyoaki Matsuura, Masaya Ito, Katsunori Nochioka, Nahoko Ogata, Organic–inorganic nanocomposite gels as an in situ gelation biomaterial for injectable accommodative intraocular lens, Soft Matter, 8, 7185-7196, 2012.08.
4. Masahiko Annaka, Toyoaki Matsuura, Shinji Maruoka, Nahoko Ogata, Dehydration and vitrification of corneal gel, Soft Matter, 8, 11, 8157-8163, 2012.03.
5. Tuyoshi Matsuda and Masahiko Annaka, Effect on Complex Formation of Neutral/Polyelectrolyte Block Copolymer and Oppositely Charged Surfactant, Langmuir, in press, 2008.06.
6. C. Yahiro, M. Annaka, A. Kikuchi and T. Okano, Collapse and Swelling of Thermosensitive Poly(N-isopropylacrylamide) Brushes Monitored by a Quartz Crystal Microbalance, Transaction of Materials Research Sosiety of Japan, 32, 807-810, 2007.10.
7. M. Annaka, K. Morishita, Electrostatic Self-Assembly of Neutral/Polyelectrolyte Block Copolymer and Oppositely Charged Surfactant,, Journal of Physical Chemistry B, 2007.10.
8. M. Annaka, M. Okamoto, T. Matsuura, Y. Hara, S. Sasaki, Dynamic Light Scattering Study of Salt Effect on Phase Behavior of Pig Vitreous Body and Its Microscopic Implication, Journal of Physical Chemistry B, 111, 8411-8418 , 2007.09.
9. M. Annaka, C. Yahiro, K. Nagase, A. Kikuchi and T. Okano, Real-time observation of coil-to-globule transition in thermosensitive poly(N-isopropyl acrylamide) brushes by quartz crystal microbalance, Polymer, 48, 5713-5720, 2007.05.
10. M. Annaka, T. Matsuura, E. Yoshimoto, H. Taguchi, M. Sugiyama, Y. Hara and T. Okano, Study on the Rapid Deswelling Mechanism of comb-type N-isopropylacrylamide gels, Colloids and Surfaces B, 10.1016/j.colsurfb.2004.03.021, 38, 3-4, 201-207, in press, 2004.12.
11. T. Matsuura, Y. Hara, F. Taketani, E. Yukawa, S. Maruoka, K. Kawasaki and M. Annaka, Volume Phase Transition of Bovine Vitreous Body and Determination of Its Dynamics, Biomacromolecules, 10.1021/bm049954y, 5, 5, 1296-1302, in press, 2004.09.
12. O. Shoji, D. Nakajima, M. Ohkawa, Y Fujiwara, M. Annaka, M. Yoshikuni, and T. Nakahira, Temperature Dependence of Circular Dichroism and Fluorescence Decay of Pyrene Appended to the Side Chains of Poly-L-glutamine, Macromolecules, vol.36, pp.4557-4566, 2002.01.
13. M. Sugiyama, A. Nakamura, N. Hiramatsu, M. Annaka and K. Hara, Effect of Salt and Heating on a Mesoscopic Structure Composed of Ovalbumin Globules in Aqueous Solution, Biomacromolecules, 10.1021/bm015541a, 2, 4, 1071-1073, vol.2, pp.1071-1073, 2001.01.
14. M. Tokita, S. Yamazaki, M. Itakura, K. Miyamoto, T Komai and M. Annaka, Swelling Behaviors of Polyamphoteric Gels, Transaction of Materials Research Sosiety of Japan, vol.25, pp.779-782, 2000.01.
15. T. Tanaka and M. Annaka, Multiple Phases of Polymer Gels and Its Biological Implications, Die Makromoleculare Chemie Symposium, 70/71, 13-22, vol.70/71, pp.13-22, 1993.12.
16. M. Annaka, T. Tanaka and Y. Osada, Volume Phase Transitions of Gels in Hydrocarbon, Macromolecules, vol.25, pp.4826-4827, 1992.01.
17. M. Annaka and T. Tanaka, Multiple Phases of Polymer Gels, Nature, vol.355, pp.430-432, 1992.01.
Membership in Academic Society
  • Japanese Society of Biorheology
  • American Chemical Sciety
  • American Physical Society
  • Japanese Retina and Vitreous Society
Educational Activities
(Lecture) Polymer Chemistry
Physical Chemistry
Statistical Chemistry
Biomaterials Chemistry