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HIROTAKA OKABE Last modified date：2024.03.28

Associate Professor / Applied Physics / Department of Applied Quantum Physics and Nuclear Engineering / Faculty of Engineering


Papers
1. Kentaro Fujimoto, Brian Adala Omondi, Shinya Kawano, Yoshiki Hidaka, Kenji Ishida, Hirotaka Okabe, Kazuhiro Hara , Ionized acrylamide-based copolymer / terpolymer hydrogels for recovery of positive and negative heavy metal ions, PLOS ONE, 10.1371/journal.pone.0298047, 19, 3, e0298047, 2024.03, [URL].
2. Nguyen Sura, Hirotaka Okabe, Brian A. Omondi, Albert Mufundirwa, Yoshiki Hidaka, Kazuhiro Hara, Study on the influence of inductive groups on the performance of carboxylate-based hydrogel polymer network, Polymer Testing, 10.1016/j.polymertesting.2019.106117, 80, 2019.12, We report study on the effect of Br and CH3 inductive groups on the loading capacity of carboxylate-based hydrogel adsorbent. Synthesized sodium acrylate (NaAc) and 2-Bromoacrylic acid (BrAc) copolymer hydrogels for metal ion capture were characterized using FTIR, UV–Vis, 13C NMR, and DSC methods for structural and functional properties. Both FTIR and UV–Vis spectra indicated formation of a charge transfer complex between Br, CH3 groups and the carbonyl (C═O) group whereas solid-state NMR evidenced Br group appearance as an appendage on hydrogel backbone. By incorporating Br group on the hydrogel matrix and consequently exploiting the high electronegativity potential and inductive effect chemistry of this group, there was a significant increase in dissociation of H+ ions and hence higher loading capacity of carboxylate group. This facilitated higher ion exchange ability, resulting in up to 4 times increase in adsorption capacity during adsorption from multi-element metal ion competitive solution. Separately, when applied on single ion non-competitive solution, its adsorption capacity on vanadium increased three-fold from 119 mg/g to 373 mg/g due to the effect of Br group. However, the CH3 had a negating effect instead lowering the adsorption capacity (below 119 mg/g); while also caused lower swelling ratio of carboxylate-functionalized hydrogel adsorbents..
3. Tran Thu Hong, Hirotaka Okabe, Yoshiki Hidaka, Brian A. Omoldi, Kazuhiro Hara, Radiation induced modified CMC-based hydrogel with enhanced reusability for heavy metal ions adsorption, polymer, 10.1016/j.polymer.2019.121772, 181, 2019.10, The study attempted solving hazardous heavy-metal problems by creating a new eco-friendly functional hydrogel adsorbent (CSB-hydrogel). By utilizing γ-irradiation induced grafting and co-polymerization, the CSB-hydrogels were synthesized from a main bio-polymer {Sodium Carboxymethyl Cellulose (CMC)} and two active vinyl monomers {Sodium Styrene Sulfonate (SSS) and Bis[2-(Methacryloyloxy)Ethyl] Phosphate (BMEP)}. As well as the compression moduli, the CSB-hydrogels showed significant difference in the swelling capacities with the variety of BMEP-amounts. The author then examined the CSB-hydrogels’ multi-metal-ion adsorption capacities by performing the ion-capturing experiments with a varying species mixture solution and by utilizing ICP-MS analysis technique. The CSB-hydrogels demonstrated their highly-efficient recovery functionalities for most of the metal ions in the solution; especially, higher than 70% for nickel. Moreover, the CSB-hydrogels showed sufficient performance after 4-time repetitive adsorption-desorption treatments. With the high heavy-metal capturing-efficiency and the re-usability, the CSB-hydrogels were revealed to have a high potential as a new eco-friendly environment-purifying material..
4. Tran Thu Hong, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Equilibrium and kinetic studies for silver removal from aqueous solution by hybrid hydrogels, Journal of Hazardous Materials, 10.1016/j.jhazmat.2018.11.008, 365, 237-244, 2019.03.
5. Md Murshed Bhuyan, Omondi Brian Adala, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Selective adsorption of trivalent metal ions from multielement solution by using gamma radiation-induced pectin-acrylamide-(2-Acrylamido-2-methyl-1-propanesulfonic acid) hydrogel, Journal of Environmental Chemical Engineering, 10.1016/j.jece.2018.102844, 7, 1, 102844, 2019.02, [URL].
6. Tran Thu Hong, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Radiation synthesis and characterization of super-absorbing hydrogel from natural polymers and vinyl monomer, Environmental Pollution, 10.1016/j.envpol.2018.07.129, 242, Part B, 1458-1466, 2018.11.
7. Kazuma Yamanaka, Takayuki Narumi, Megumi Hashiguchi, Hirotaka Okabe, Kazuhiro Hara, Yoshiki Hidaka, Time-Dependent Diffusion Coefficients for Chaotic Advection due to Fluctuations of Convective Rolls, Fluids, 10.3390/fluids3040099, 3, 4, 1-8, 99, 2018.11.
8. Yoshiki Hidaka, Kosuke Ijigawa, Seung-Yong Kwak, Noriko Oikawa, Hirotaka Okabe, Kazuhiro Hara, Information Reduction for Chaotic Patterns , Forma, 33, S3-S7, 2018.10, [URL].
9. Brian A. Omondi, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Fabrication of poly (1, 4-dioxa-7, 12-diazacyclotetradecane-8, 11-dione) macrocyclic functionalized hydrogel for high selective adsorption of Cr, Cu and Ni, Reactive and Functional Polymers, 10.1016/j.reactfunctpolym.2, 130, 90-97, 2018.09.
10. Brian Adala Omondi, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Synthesis and Characterization of Poly(1,4,7-Trioxacycloundecane-8,11-dione) Macrocyclic Functionalized Hydrogel for High Selectivity Adsorption and Complexation of Bismuth Ion, Polymers, https://doi.org/10.3390/polym10060662, 10, 6, 662, 2018.06.
11. Brian Adala Omondi, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Poly (1, 4-diazocane-5, 8-dione) macrocyclic-functionalized hydrogel for high selectivity transition metal ion adsorption, Journal of Environmental Chemical Engineering, https://doi.org/10.1016/j.reactfunctpolym.2018.02.003, 125, 11-19, 2018.04.
12. Md Murshed Bhuyan, Hirotaka Okabe, Yoshiki Hidaka, Nirmal Chandra Dafader, Nazia Rahman, Kazuhiro Hara, Synthesis of pectin-N, N-dimethyl acrylamide hydrogel by gamma radiation and application in drug delivery (in vitro), Journal of Applied Polymer Science, https://doi.org/10.1080/10601325.2018.1442177, 55, 4, 369-376, 2018.02.
13. Kazuya Maeda, Takayuki Narumi, Rinto Anugraha, Hirotaka Okabe, Kazuhiro Hara, Yoshiki Hidaka, Sub-Diffusion in Electroconvective Turbulence of Homeotropic Nematic Liquid Crystals, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.87.014401, 87, 1, 014401, 2018.01.
14. Md Murshed Bhuyan, Hirotaka Okabe, Yoshiki Hidaka, Kazuhiro Hara, Pectin-[(3-acrylamidopropyl) trimethylammonium chloride-co-acrylic acid) hydrogel prepared by gamma radiation and selectively silver (Ag) metal adsorption, Journal of Applied Polymer Science, http://dx.doi.org/10.1002/app.45906, 135, 8, 45906, 2017.10.
15. Thu Hong Tran, HIROTAKA OKABE, Yoshiki Hidaka, Kazuhiro Hara, Removal of metal ions from aqueous solutions using carboxymethyl cellulose/sodium styrene sulfonate gels prepared by radiation grafting, Carbohydrate Polymers, http://dx.doi.org/10.1016/j.carbpol.2016.09.049, 157, 335-343, 2017.02.
16. Takayuki Narumi, Yosuke Mikami, Tomoyuki Nagaya, HIROTAKA OKABE, Kazuhiro Hara, Yoshiki Hidaka, Relaxation with long-period oscillation in defect turbulence of planar nematic liquid crystals, Phys. Rev. E, https://doi.org/10.1103/PhysRevE.94.042701, 94, 042701, 2016.10.
17. Kazuhiro Hara, Seiya Fujiwara, Tetsumasa Fujii, Satoru Yoshioka, Yoshiki Hidaka, HIROTAKA OKABE, Attempts to Capturing ppb-level Elements from Sea Water with Hydrogels, Progress in Nuclear Energy, http://dx.doi.org/10.1016/j.pnucene.2015.04.017, 92, 228-233, 2016.09.
18. Brian Adala Omondi, Ronald Nguele, HIROTAKA OKABE, Yoshiki Hidaka, Kazuhiro Hara, Multicomponent adsorption of benzene and selected borderline heavy metals by poly (butadiene-co-acrylic acid) hydrogel, Journal of Environmental Chemical Engineering, http://dx.doi.org/10.1016/j.jece.2016.07.013, 4, 3, 3385-3392, 2016.09.
19. Md. Murshed Bhuyan, Nirmal Chandra Dafader, HIROTAKA OKABE, Yoshiki Hidaka, Kazuhiro Hara, Md. Mizanur Rahman, Mohammad Mizanur Rahman Khan, Nazia Rahman, Synthesis of Potato Starch-Acrylic-Acid Hydrogels by Gamma Radiation and Their Application in Dye Adsorption, International Journal of Polymer Science, http://dx.doi.org/10.1155/2016/9867859, 2016, Article ID 9867859, 11 pages, 2016.08.
20. Misato Iino, Yoshiki Hidaka, Fahrudin Nugroho, Rinto Anugraha, HIROTAKA OKABE, Kazuhiro Hara, Responses of spatiotemporal chaos to oscillating forces, Phys. Rev. E, doi.org/10.1103/PhysRevE.92.012916, 92, 012916, 2015.07.
21. Katsuhiro Kobayashi, HIROTAKA OKABE, Shinya Kawano, Yoshiki Hidaka, Kazuhiro Hara, Biophoton Emission Induced by Heat Shock, PLOS ONE, 9, 8, e105700, 2014.08, [URL].
22. Nazia Rahman, Nobuhiro Sato, Satoru Yoshioka, Yoshiki Hidaka, HIROTAKA OKABE, Kazuhiro Hara, Selective Hg(II) adsorption from aqueous solutions of Hg(II) and Pb(II) by hydrolyzed acrylamide-grafted PET films, Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering, 10.1080/10934529.2014.882209, 49, 7, 798-806, 2014.07, [URL].
23. Nazia Rahman, Nobuhiro Sato, Satoru Yoshioka, Yoshiki Hidaka, HIROTAKA OKABE, Kazuhiro Hara, The effect of hot DMSO treatment on the γ-ray-induced grafting of acrylamide onto PET films, Polymer Journal, 10.1038/pj.2014.12, advance online publication 19 March 2014, 2014.04, [URL].
24. Nazia Rahman, Nobuhiro Sato, Satoru Yoshioka, Masaaki Sugiyama, HIROTAKA OKABE, Kazuhiro Hara, Selective Cu(II) Adsorption from Aqueous Solutions Including Cu(II), Co(II), and Ni(II) by Modified Acrylic Acid Grafted PET Film, ISRN Polymer Science, http://dx.doi.org/10.1155/2013/536314, 2013, 1-9, 536314, 2013.07, [URL], Acrylic acid (AAc) grafted polyethylene terephthalate (PET) films were prepared by γ irradiation. The graft films showed little metal ion adsorption due to compact structure of the graft chains as shown by the scanning electron microscopy (SEM) images which restricted the access of metal ions to the functional groups. Therefore, the graft films were modified with KOH treatment for expansion of the graft chains to facilitate the access of metal ions to the functional groups. The modified films were used to study the selective Cu2+ adsorption from aqueous solution containing Cu2+, Co2+, and Ni2+. Langmuir and Freundlich isotherm models were used for interpretation of selective equilibrium adsorption data and Langmuir model showed better fitting with experimental data. Again pseudo-first-order and pseudo-second-order equations were used for interpretation of selective kinetic adsorption data and pseudo-second-order equation showed better prediction of experimental data. The adsorbent film showed high selectivity towards Cu2+ in presence of Cu2+, Co2+, and Ni2+ in the pH range of 1.5 to 4.5. Desorption and reuse of the adsorbent film were also studied which indicated that the film can be used repeatedly for selective Cu2+ sorption from aqueous solution..
25. Yusril Yusuf, Shohei Yamaguchi, Shinya Kawano, HIROTAKA OKABE, Simon Krause, Heino Finkelmann, P. E. Cladis, Shoichi Kai, Polar Liquid Crystal Elastomers Cross Linked Far from Thermodynamic Phase Transitions: Dislocation Loops in Smectic Clusters, Advances in Condensed Matter Physics, 10.1155/2013/752060, 2013, 1-11, 752060, 2013.06, [URL], Nematic networks with three different concentrations of polar and nonpolar mesogens and the same concentration of a novel cross-linking agent give rise to unusual liquid single crystal elastomers (LSCEs) that are transparent monodomain nematic networks with smectic clusters. The largest spontaneous length change is observed in the sample with 70 mol% of the polar mesogen which also has the highest glass transition temperature and smectic clusters with a slowly increasing but nearly constant layer spacing on cooling from 90°C to 25°C. X-ray scattering intensity from smectic clusters with layer spacings that monotonically increase on cooling first increases to a maximum at C corresponding to clusters of about 30 layers. Below , the scattering intensity decreases as the number of layers in a cluster decreases. To account for this surprising nonlinear behavior that correlates with nonlinear features of the networks’ macroscopic spontaneous shape change and birefringence, a model is proposed where dislocations form in the layers at . Below , more dislocations form to break down the layer structure. The possibility of dislocation formation at independent of mesogenic concentrations is attributed to a conformational change in the crosslinker which is present at the same concentration in the three LSCEs..
26. Tomoyuki Ohya, Keitaro Tanoi, Yousuke Hamada, Hirotaka Okabe, Hiroki Rai, Junko Hojo, Kazutoshi Suzuki, Tomoko M. Nakanishi, An Analysis of Long-Distance Water Transport in the Soybean Stem Using H2 15O, Plant and Cell Physiology, Vol.49, pp.718-729, 2008.05.
27. Ryuzou Kawabata, Tohru Miike, Hirotaka Okabe, Masayoshi Uefune, Junji Takabayashi, Masami Takagi and Shoichi Kai, Spectral Analysis of Ultraweak Chemiluminescence from Kidney Bean Leaf Infested with Tetranychus Kanzawai Kishida, Japanese Journal of Applied Physics, 10.1143/JJAP.44.1115, 44, 2, 1115-1118, Vol. 44, Part. 1, No. 2, pp.1115-1118, 2005.02.
28. Ryuzou Kawabata, Masayoshi Uefune, Tohru Miike, Hirotaka Okabe, Junji Takabayashi, Masami Takagi, Shoichi Kai, Biophoton Emission from Kidney Bean Leaf Infested with Tetranychus Kanzawai Kishida, Japanese Journal of Applied Physics, 10.1143/JJAP.43.5646, 43, 8A, 5646-5651, Vol. 43, Part. 1, No. 8A, pp.5646-5651, 2004.08.
29. Tomoyuki OHYA, Noriko OIKAWA, Ryuzou KAWABATA, Hirotaka OKABE, Shoichi KAI, Biophoton Emission Induced by Osmotic Stress in Adzuki Bean Root, Japanese Journal of Applied Physics, 10.1143/JJAP.42.7625, 42, 12, 7625-7628, Vol. 42, Part. 1, No. 12, pp.7625-7628, 2003.12.
30. Seiji TAKI, Hirotaka OKABE, Shoichi KAI, Study of Odd-even Effect in Molecular Alignments of nOCB Liquid Crystals:
STM Observation and Charge Density Distribution Analysis, Japanese Journal of Applied Physics, 10.1143/JJAP.42.7053, 42, 11, 7053-7056, Vol. 42, Part. 1, No. 11, pp.7053-7056, 2003.11.
31. Tomoyuki OHYA, Satoshi YOSHIDA, Ryuzou KAWABATA, Hirotaka OKABE, Shoichi KAI, Biophoton Emission Due to Drought Injury in Red Beans: Possibility of Early Detection of Drought Injury, Japanese Journal of Applied Physics, 10.1143/JJAP.41.4766, 41, 7A, 4766-4771, Vol. 41, Part. 1, No. 7A, pp.4766-4771, 2002.07.
32. Tomoyuki OHYA, Noriko OIKAWA, Hirotaka OKABE and Shoichi KAI, Stress-induced damage and chemiluminescence from a root seedling in red bean, The 6th Symposium of the International Society of Root Research, pp. 270-271, 2001.11.
33. Satoshi KAWAGUCHI, Masayasu MIMURA, Tomoyuki OHYA, Noriko OIKAWA, Hirotaka OKABE and Shoichi KAI, Hormone-mediated pattern formation in seedling of plants: a competitive growth dynamics model, Journal of the Physical Society of Japan, 10.1143/JPSJ.70.3155, 70, 10, 3155-3160, Vol. 70, No. 10, pp.3155-3160, 2001.10.
34. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Coexistence of Capillary and Elastic Surface Waves at the Gelation Point of Tungstic Acid, Statistical Physics, Third Tohwa University Internatioal Conference, Fukuoka, Japan 1999, AIP Conference Proceedings 519, 519, 173-175, pp.173-175, 2000.08.
35. Tomoyuki OHYA, Hideaki KURASHIGE, Hirotaka OKABE and Shoichi KAI, Early Detection of Salt Stress Damage by Biophotons in Red Bean Seedling, Japanese Journal of Applied Physics, 10.1143/JJAP.39.3696, 39, 6A, 3696-3700, Vol. 39, Part. 1, No. 6A, pp.3696-3700, 2000.06.
36. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Cepstrum Analysis for Surface Waves on Gels, Japanese Journal of Applied Physics, 10.1143/JJAP.39.2952, 39, 5B, 2952-2953, Vol. 39, Part. 1, No. 5B, pp.2952-2953, 2000.05.
37. Satoshi KAWAGUCHI, Masayasu MIMURA, Tomoyuki OHYA, Noriko OIKAWA, Hirotaka OKABE and Shoichi KAI, Hormone-Dependent Model on Seed Germination Sensitive to Growth Stage, Journal of the Physical Society of Japan, 10.1143/JPSJ.69.1234, 69, 4, 1234-1244, Vol. 69, No. 4, pp.1234-1244, 2000.04.
38. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Viscoelastic Behavior of Tungstic Acid Gel during the Gelation Process, Hydrocolloids Part. 1 Physical Chemistry and Industrial Applications of Gels, Polysaccharides, and Proteins, 79-84, pp.79-84, 2000.01.
39. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Crossover from Capillary and Elastic Surface Wave around the Gelation Point of Tungstic Acid - Cepstrum Analysis -, Reports on Progress in Polymer Physics in Japan, Vol. 42, pp.101-102, 2000.01.
40. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Surface Waves and Viscoelastic Properties of Gels, Transactions of the Materials Research Society of Japan, Vol. 24, No. 4, pp.575-578, 1999.12.
41. 川口　聡、三村昌泰、大矢智幸、岡部弘高、甲斐昌一, ホルモンを介した植物の集団生長−感受率変化を取り入れた根の生長モデル−, 九州大学工学集報, 72, 3, 283-290, 1999.05.
42. rotaka OKABE, Kazuhiro HARA and Shoichi KAI, Viscoelastic Properties near the Sol-Gel Transition, AIP (American Institute of Physics) Conference Proceedings 469, Slow Dynamics in Complex Systems, 469, 673-674, pp.673-674
Proceedings of Eighth Tohwa University International Symposium, November 1998, 1999.05.
43. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Anomalous Velocity Change of Surface Wave near the Gelation Point, Physica B, 10.1016/S0921-4526(98)01304-0, 263, 73-76, Vol. 263-264, pp.73-76, 1999.03.
44. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, The Correlation of Viscoelasticity and Surface Wave Mode during the Gelation Process, Reports on Progress in Polymer Physics in Japan, Vol. 41, pp.443-444, 1999.01.
45. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, The Change of Surface Wave Property near the Gelation Point of Tungstic Acid, Reports on Progress in Polymer Physics in Japan, Vol. 40, pp.219-222, 1998.05.
46. Hirotaka OKABE, Keiichi KUBOYAMA, Kazuhiro HARA and Shoichi KAI, Propagating Properties of Surface Waves and Viscoelasticity near the Gelation Point, Japanese Journal of Applied Physics, 10.1143/JJAP.37.2815, 37, 5B, 2815-2817, Vol. 37, Part. 1, No. 5B, pp.2815-2817, 1998.05.
47. H. Okabe, K. Kuboyama, K. Hara, S. Kai, Velocity Change of Surface Wave near the Gelation Point, Proc. WCU 97, 24-27 Aug. 1997, Yokohama, pp.216-217, 1997.07.
48. K. Hara, H. Kanaya, T. Masuike, N. Koshobu, H. Okabe, S. Kai, A. Nakamura, N. Hiramatsu, T. Nishida, E. Takushi, Some Features in Gel Drying Process and Dehydrated Substances, Progress of Theoretical Physics, 126, 249-252, Supplement, No. 126, pp.249-252, 1997.07.
49. H. Okabe, H. Nishimura, K. Hara, S. Kai, Gelation and Glass Transition in Thermosetting Process of Epoxy Resin, Progress of Theoretical Physics, 126, 119-122, Supplement, No. 126, pp.119-122, 1997.07.


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