Hiroshima University, Graduate School of Engineering 

Polymer Technology Lab.

Nakai・Gotoh Lab.

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 Japanese

  A polymer gel is a cross-linked three dimentional polymer networks that contains liquids in its internal space. It is a soft matter intermediate between a solid and a liquid. The gel shows discontinuous volume change when a external stimuli such as temperature, light and electric field, is imposed upon it. It is called a stimuli responsiveness.

  The polymer gel  swells or shrinks when external condition such as  ion strength or solvent composition is changed. It is called a phase transition. The phase transition in gels caused by four fundamental interactions, i.e. hydrogen bonding, hydrophobic interaction, van der Waals interaction and ionic interaction between ionized groups.

  There are many potential applications of the polymer gels  such as the separation of solutes or metal ions, immobilization of enzymes and drug delivery system. New application also has been developed, in which gel networks are used as a reaction, separation and/or chemo-mechanical energy transformation media, for example, adsorbents, membranes, chromatography and preparation of fine particles in the gel networks.

 

Proceedings (after 2000)

1. Takashi Iizawa, Tatsuya Asai; "Synthesis of Polymer-immoblized Heteropoly acids and Their Catalytic Activity", Proc. of World Congress on Particle Technology, No. 569, 1-8 (2000)

2. Shuji Sakohara, Kazuo Nishikawa; “Flocculation and Compaction of Suspended Particles Utilizing Hydrophobic Transition of Ionic Thermosensitive Polymers,” Proc. of World Congress on Particle Technology, No. 569, 1-8 (2002)

3. Takehiko Gotoh, Hiroshi Okamoto, Shuji Sakohara; “Dewatering of Organic Sludge Using Thermo-sensitive Porous Gel,” Proc. of 9^th APCChE Congress, No. 415, 1-8 (2002)

4. Takashi Iizawa, Sugano Satomi, Hitomi Matsushita; “Synthesis of core-shell type gel from esterification of poly(acrylic acid) gel and its application to drug carrier,” Proc. of 9^th APCChE Congress, (2002)

5. Takehiko Gotoh, Hiroshi Okamoto, Shuji Sakohara; “The Application of Thermosensitive Porous Gel for Dewatering of Organic Slurry,” Korea-Japan Symposium on Materials, O-12, Abstract p. 14 (2003)

6. Ryoichi Kanazawa, Shuji Sakohara; “Separation of Heavy Metal Ions by Using Molecular Imprinted Thermosensitive Gels,” Korea-Japan Symposium on Materials, P-25, Abstract p. 51 (2003)

7.  Ryoichi Kanazawa, Hideaki Toluyama, Shuji Sakohara, “Separation of Heavy Metals by Selective Adsorption on Imprinted Thermosensitive Gels and Adsorption/Desorption Properties by Temperature Swing,” Gel Sympo 2003, II Pc 33, Abstract p. 127 (2003)

8. Takehiko Gotoh, Hiroshi Okamoto, Shuji Sakohara, ”The Dewatering of Organic Slurry by Using Reinforced Thermosensitive Porous Gel,” Gel Sympo 2003, II Pc 34, Abstract p. 128 (2003)

9. Takashi Iizawa, Y. Onohara, Y. Matuura, ”Synthesis of Poly(N-alkylacrylamide) Copolymer Gels and Their SwellingBehavior,” Gel Sympo 2003, I Pa 31, (2003)

10. Takehiko Gotoh, Shuji Sakohara; “Strcture and Swelling Behavior of Porous Thermosensitive Gel,” Polymer Networks 2004, Abstract No. 140 (2004)

11. Kotaro Tomita, Shuji Sakohara, Chiaki Nagahama, Takashi Akita; “Thermosensitive Porous Gels for Application in DNA Chips,” Proc. of 10^th APCChE Congress, No. 514, 1-8 (2004)

12. Hideaki Tokuyama, Ryoichi Kanazawa, Shuji Sakohara; “Adsorption/Desorption of Target Metal on Molecular Imprinted Thermosensitive Gel Adsorbent: Equilibrium Isotherms and Kinetic Behavior,” Proc. of 10^th APCChE Congress, No. 245, 1-8 (2004)

13. Tomoaki Kusaka, Eiichi Ochiai, Shuji Sakohara; “Sludge Dewatering Utilizing Hydrophilic/ Hydrophobic Transition of Thermosensitive Polymers,” Proc. of 10^th APCChE Congress, No. 513, 1-8 (2004)

14. Hideaki Tokuyama, Ryoichi Kanazawa, Shuji Sakohara; "Reconstraction/Destraction of Adsorption Site by Temperature Swing for a Target Metal Imprinted on Thermosensitive Gels", 6^th Japan-Korea Symposium on Materials & Interfaces, A-16, Abstract p. 44 (2004)

15. Takehiko Gotoh, Tomoaki Asano, Shuji Sakohara; "The Swelling Behavior of Porous Thermosensitive Gels – The Effect of Polymer Concentration －", 6^th Japan-Korea Symposium on Materials & Interfaces, P-26, Abstract p. 72 (2004)

16. Takashi Iizawa, Taizo Ninomiya, Makoto Maruta, Takehiko Gotoh, Shuji Sakohara; “Synthesis of Porous (N-isopropylacrylamide) Gel Beads by Sedimentation Polymerization and Their Swelling Behavior”, 6^th Japan-Korea Symposium on Materials & Interfaces, P-27, Abstract p. 73 (2004)

17.  Masaru Fujioka, Hideaki Tokuyama, Shuji Sakohara; “Temperature Swing Adsorption of a Target Metal on Molecular Imprinted Thermosensitive Gel with Cross-linked Chelating Group,” 6^th Japan-Korea Symposium on Materials & Interfaces, P-28, Abstract p. 74 (2004)

18.  Kazuya Mori, Shuji Sakohara; “Preparation of Nano-Sized ZnO Particles in Amphiphilic Gel Network,” 6^th Japan-Korea Symposium on Materials & Interfaces, P-29, Abstract p. 75 (2004)

19. Shuji Sakohara, Tomoaki Kusaka, Eiichi Ochiai; “Compaction and Dewatering of Activated Sludge Utilizing Hydrophilic/Hydrophobic Transition of Cationic Thermosensitive Polymers,” Proc. of FILTECH 2005, Vol. 1, p. 290-298 (2005)

20. Shuji Sakohara, Tomoaki Kusaka, Eiichi Ochiai; “Dewatering of Activated Sludge Utilizing Hydrophilic/Hydrophobic Transition of Ionic Thermosensitive Polymers,” FILTRATION AND SEPARATION SYMPOSIUM ’05, 81-85 (2005)

21. Hideaki Tokuyama, Kiyomi Yanagawa, Shuji Sakohara; “Temperature swing adsorption of heavy metals on thermosensitive gels and/or polymers having phosphate groups,” The 2005 Inter. Chem. Congress Pacific Basin Soc. (PACIFICHEM 2005), Abstract No. 624 (2005)

22. Takehiko Gotoh, Shuji Sakohara; “Application of Porous Thermosensitive Gel for Dewatering of Organic Slurry,” Polymer Gels and Networks, 96 (2005)

23. Machiko Ohuchida, Tomomi Abe, Yoshinobu Matsuura, Takashi Iizawa; "Synthesis of Thermosenstive Poly(N-alkylacrylamide) Gel Beads and Core-Shell Type Gel Beads Polymerization", The 2005 Inter. Chem. Congress Pacific Basin Soc. (PACIFICHEM 2005), Symposium#76，# 16 (2005)

24. Takashi Iizawa, Hatsumi Taketa, Takeshi Gotoh, Shuji Sakohara; Synthesis of Porous Poly(N-isopropylacrylamide) Gel Beads by Sedimentation Polymerization", The 2005 Inter. Chem. Congress Pacific Basin Soc. (PACIFICHEM 2005), Symposium#76，# 18 (2005)

25. Hideaki Tokuyama, Masaru Sasaki, Shuji Sakohara; “Substrate effect on the formation of thermosensitive copolymer gels having composition-gradient structure,” 41st International Symposium on Macromolecules (MACRO 2006), Abstract No. 0151 (2006)

26. Takehiko Gotoh, Yasunao Seo, Shuji Sakohara; “Adsorption/Desorption Properties of Hydrophobic Molecules on Porous Thermosensitive Gel,” Polymer Networks Group Conference 2006, Abstract M8 (2006)

27.  Takuya Arase, Takehiko Gotoh, Shuji Sakohara; “Adsorption/Desorption of Phosphoric Acid on Novel Thermosensitive Gel Adsorbent Polymer Networks Group Conference 2006, Abstract T4 (2006)

28. Shinji Naohara, Hideaki Tokuyama, Masaru Fujioka, Shuji Sakohara; “Preparation of molecular imprinted thermosensitive gel grafted on polypropylene by using plasma polymerization method and its adsorption behaviors of heavy metal,” 7^th Kore-Japan Symposium on Materials, Abstract P-9 (2006)

29. Yuko Okada, Kenta Hamai, Shuji Sakohara; “Semi-IPN gel for application in DNA chips, 7^th Kore-Japan Symposium on Materials,” Abstract P-11 (2006)

30. Kiyomi Yanagawa, Hideaki Tokuyama, Shuji Sakohara; “Adsorption characteristics of heavy metals on N-isopropylacrylamide thermosensitive polymers and/or gels,” 7^th Kore-Japan Symposium on Materials, Abstract P-15 (2006)

31. Takehiko Gotoh, Shinya Fukuda, Shuji Sakohara, “Dewatering of Organic Slurry with Improved Reinforced Porous Thermo-sensitive Gel,” FILTRATION AND SEPARATION SYMPOSIUM ’07, 139-143 (2007)

32. Masato Taira, Takehiko Gotoh, Shuji Sakohara; “Adsorption/Desorption Properties of Endocrine Disrupting Chemicals by Hybrid Nano-particles Composed of Magnetite and Thermosensitive Polymer,” 8^th Japan-Korea Symposium on Materials & Interfaces  ― International Symposium on Frontiers in Chemical Engineering ―, Abstract P-36 (2008)　

33. Takehiko Gotoh, Takuya Arase, Shuji Sakohara; “Novel Thermosensitive Gel Adsorbent for Phosphoric Acid,” 8^th Japan-Korea Symposium on Materials & Interfaces  ― International Symposium on Frontiers in Chemical Engineering ―, Abstract P-89 (2008)

34.  Atsuhi Takahashi, Chuhei Oostuki, Yuko Okada, Shuji Sakohara; “Thermosensitive properties of N,N-dimethylacrylamide gel having poly(N-isopropylacrylamide) chains grafted on gel network,” 8^th Japan-Korea Symposium on Materials & Interfaces  ― International Symposium on Frontiers in Chemical Engineering ―, Abstract P-38 (2008)

35. Takehiko Gotoh, Takuya Arase, Shuji Sakohara; “Novel pH-thermosensitive gel adsorbents for phosphoric acid,” 2008 MRS Fall Meeting, Symposium BB (2008)

36. Atsushi Takahashi, Chuhei Ootsuki, Shuji Sakohara; “Thermosensitive properties of N,N-dimethylacrylamide gel having poly(N-isopropylacrylamide) Chains grafted on gel network,” The 5^th Joint China/Japan Chemical Engineering Symposium, S3-P-12, 1-5 (2009)

37. Shuji Sakohara, Seiichi Yagi, Ryosuke Hinago, Takashi Iizawa, Kunihiko Hashimoto; “Dewatering of water treatment sludge by biodegradable thermosensitive polymers,” FILTRATION AND SEPARATION SYMPOSIUM 2009, 129-133 (2009)

38. Atsushi Takahashi, Shuji Sakohara; “Thermosensitive properties of N,N-dimethylacrylamide gel with poly(N-isopropylacrylamide) grafted on gel network,” GelSympo 2009, p35b (2009), Kansai University

39. Takehiko Gotoh, Kazunari Tanaka, Shuji Sakohara; “Separation of phosphate ions by thermosensitive gel with tertiary amino group,” Polymer Network Group 20th Conference, p. 160,   (2010), Goslar, Germany

40. Shuji Sakohara, Takashi Iizawa, Dewatering of drinking water treatment sludge by using dual ionic thermosensitive polymers with biodegradability, European Conference on Fluid-Particle Separation (FPS2010), p. 89-90 (2010), Lyon, France

41. Sho Kimata, Makoto. Chuman, Shuji Sakohara, Separation of Endocrine Disrupters by Stimulus-Responsive Unimolecular Micelles Grafted on Nonwoven Fabrics, 9^th Korea-Japan Symposium on Materials & Interfaces, PE-03 (2010), Yeosu, Korea

42. Atsushi Takahashi, Yasuo Nakaya, Shuji Sakohara, Thermosensitive Properties of N,N-Dimethylacrylamide Gel with Poly(N-isopropylacrylamide) Chains Grafted on Gel Network, 9^th Korea-Japan Symposium on Materials & Interfaces, PE-04 (2010), Yeosu, Korea

43. Seiichi Yagi, Ryosuke Hinago, Takashi Iizawa, Shuji Sakohara, Preparation of Novel ionic Thermosensitive Polymers with Biodegradability and Dewatering of Drinking Water Treatment Sludge, 9^th Korea-Japan Symposium on Materials & Interfaces, PE-07 (2010), Yeosu, Korea

44. Hideaki Tokuyama, Atsushi Takahashi, Shuji Sakohara, Temperature-Swing Co-Adsorption of Heavy Metal Ions and Humic Acid onto Thermosensitive Polymers and/or Grafted Polymers, 9^th Korea-Japan Symposium on Materials & Interfaces, PE-08 (2010), Yeosu, Korea

45. Atsushi Takahashi, Yasuo Nakaya, Shuji Sakohara, Thermosensitive properties of N,N-dimethylacrylamide gel with oligo(N-isopropylacrylamide) chains grafted on gel network, The 6^th Joint China-Japan Chemical Engineering Symposium, NM-P-03 (2011), Wuhan, China

46. Sho Kimata, Makoto Chuman, Shuji Sakohara, Separation of endocrine disripter by pH-responsive unimolecular micelles grafted on porous support, The 6^th Joint China-Japan Chemical Engineering   Symposium, NM-P-07 (2011), Wuhan, China

47. Taichi Kawachi, Shuji Sakohara, Compaction of suspended particles with dual ionic thermosensitive polymers incorporating a hydrophobic component, 11^th World Filtration Congress, L13 (2012), Graz, Austria

48. Takehiko Gotoh, Kengo Iwamoto, Shuji Sakohara, Repeated Adsorption of Metal Ions onto Thermosensitive Ionic Hydrogel by Temperature Swing, Polymer Networks Group 21^st Conference, 3 (2012), Jackson Hole, USA

49. Shuji Sakohara, Separation Technology Using Stimuli-Responsive Polymers and Gels (Plenary lecture), 19^th Regional Symposium on Chemical Engineering (RSCE2012) (2012), Bali, Indonesia

50. Koji Teramoto, Toshiyuki Harada, Takehiko Gotoh, Takashi Iizawa, Shuji Sakohara, Separation of endocrine disruptor by pH-responsive unimolecular micelles grafted on porous material, 10^th Japan-Korea Symposium on Materials & Interafces, P-25 (2012), Kyoto, Japan

51. Eva Oktavia Ningrum, Yukiko Nurakami, Takehiko Gotoh, Takashi Iizawa, Shuji Sakohara, Development of a novel adsorbent using zwitteirionic betaine gels, 10^th Japan-Korea Symposium on Materials & Interafces, P-25 (2012), Kyoto, Japan

52. Eva Octavia Ningrum, Yukiko Murakami, Yasuhiro Ofuka, Shuji Sakohara, Transition and adsorption behavior of zwitterionoc gels in various salt solutions,9^th World Congress of Chemical Engineering, MoP-T1-012,　1-4 (2013), Seoul, Korea

53. Eva Octavia Ningrum, Yukiko Murakami, Yasuhiro Ofuka, Shuji Sakohara, Adsorption properties of cations and anions by zwitterionic sulfobetaine gels, Polymer Networks Group 22^nd Conference, PST 40c (2014), Tokyo, Japan