Article
Polymer Science
Liurong Huang, Shuang Ding, Tian Chen, Ruike Wu, Xinyu Wang, Shifang Jia
Summary: This paper investigates the structural and functional properties of collagen from tilapia scales pretreated by heat-assisted ionic liquids. The results show that the solubility of collagen, exposure of chromophores, and regeneration of collagen subunits were all influenced by the heat-assisted IL pretreatments. The functional properties of regenerated collagen, including gel strength, viscosity, water-binding capacity, and emulsifying capacity, were also impacted by the different IL pretreatments.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Osamu Wada, Doddoji Ramachari, Chan-Shan Yang, Yukihiro Harada, Takashi Uchino, Ci-Ling Pan
Summary: The dielectric properties of multi-component silicate oxide glasses were studied, focusing on high dielectric constant oxyfluorosilicate (OFS) glasses. Infrared reflection spectroscopy and terahertz (THz) timedomain spectroscopy were used to investigate the vibrational parameters and ionic pairs in OFS glasses. The THz dielectric strength of OFS glasses was found to be dominated by the lowest frequency mode, while the high frequency dielectric constant showed a superlinear dependence on the electronic polarizability of oxygens. The low frequency mode contribution to the dielectric constant was enhanced by the ionicity and exhibited a steeper dependence on the electronic polarizability.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Rui Shi, Anthony J. Cooper, Hajime Tanaka
Summary: The behaviour of ions solvated in water is highly ion-specific and can be explained by considering the interplay between ion-water and inter-water interactions as well as the bond-orientational order of the hydration shell. This study provides insight into the ion-specific effects observed in salt solutions and their impact on solution dynamics. The findings have fundamental implications for ionic processes in aqueous solutions, offering a physical principle for electrolyte design and application.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
P. P. Bobrov, N. A. Golikov, E. S. Kroshka, A. V. Repin
Summary: This research proposes a broadband dielectric spectroscopy method for assessing the permeability and average pore size of porous rocks. The study finds that the parameters of relaxation processes are well correlated with the low-frequency conductivity of the samples, but show no stochastic dependence on pore size and permeability. The parameters of high-frequency relaxation processes, however, depend on the solution ratio, concentration, pore size, and permeability.
JOURNAL OF APPLIED GEOPHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Olivia Peytral-Rieu, David Dubuc, Katia Grenier
Summary: To improve research accuracy, biologists have begun using 3D models as intermediates between 2D cell culture and in vivo tissue study. These models include spheroids, which retain in vivo characteristics while being easy to use. Various nondestructive techniques, such as electromagnetic wave analysis, are used to study these objects. However, low-frequency waves cannot penetrate cells and most microwave devices only focus on smaller scales or larger tissues. This article presents a microwave spectroscopy device that fills the scale gap by characterizing fixed spheroids' dielectric properties.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Changting Pi, Huizhen Jenny Qian, Tianyi Wang, Jie Zhou, Zhixian Deng, Yiyang Shu, Xun Luo
Summary: This paper proposes a fully integrated wideband high-resolution THz spectroscope using a multi-branch rotational symmetric sensing surface. The proposed structure can expand the induction frequency range, increase the effective induction area, and support multiple detectors for high detection accuracy. The rotational symmetric characteristic of the sensing surface allows for consistent responses in different polarization directions. The experiment verifies the effectiveness of the proposed spectroscope, which has a wide detection range and high frequency resolution.
2022 IEEE/MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS 2022)
(2022)
Article
Materials Science, Multidisciplinary
Vincent Irawan, Daichi Kajiwara, Yasuhiro Nakagawa, Toshiyuki Ikoma
Summary: Hydroxyapatite (HAp) and collagen (Col) composites have been successfully fabricated as bilayer membranes with distinct layer-by-layer structures and robust mechanical properties using a combination of sequential self-assembly and ethanol-exchanged methods. The membranes exhibited HAp embedded in Col fibrils, with sequentially self-assembled membranes showing distinct HAp/Col layers and simultaneously self-assembled membrane having a continuous interface.
Review
Materials Science, Biomaterials
Tarun Agarwal, Irene Chiesa, Dario Presutti, Vincent Irawan, Kiran Yellappa Vajanthri, Marco Costantini, Yasuhiro Nakagawa, Sheri-Ann Tan, Pooyan Makvandi, Ehsan Nazarzadeh Zare, Esmaeel Sharifi, Carmelo De Maria, Toshiyuki Ikoma, Tapas Kumar Maiti
Summary: The inadequate self-repair and regenerative efficiency of cartilage tissues have led researchers to devise advanced strategies, including the introduction of bioprinting, for resolving this issue. This review discusses the implications of standard and advanced 3D/4D printing technologies for repairing various cartilage tissues, highlights stem cell opportunities, and explores critical issues and prospects for future developments in personalized medicine.
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Nicolas Debons, Kenta Matsumoto, Noriyuki Hirota, Thibaud Coradin, Toshiyuki Ikoma, Carole Aime
Summary: The study involves the preparation of bionanocomposites from tilapia fish scale collagen and multifunctional silica nanoparticles under high magnetic field, showing the potential of these scaffolds to improve cell performance.
Article
Multidisciplinary Sciences
Manpreet Kaur, Satoshi Ishii, Ryusuke Nozaki, Tadaaki Nagao
Summary: In this study, it was found that wetting and evaporation of pure water from a porous alumina block can generate electrical current. This power generation scheme is simple, clean, versatile, and does not require any input of heat or light.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Dock-Chil Che, Hiroshi Kawamata, Masaaki Nakamura, Toshio Kasai, King-Chuen Lin
Summary: The photodissociation dynamics of isohaloethane at 234 nm was investigated using a sliced imaging technique combined with an oriented molecular beam. The speed and angular distributions of the competitive products were analyzed, revealing Gaussian-like characteristics for Br atoms and Boltzmann-like characteristics for Cl atoms.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xinyan Zhang, Cunfang Zhang, Ren Guo, Song Chen, Jianan Zhang, Xiaona Li, Toshiyuki Ikoma, Weiyi Chen
Summary: TiO2 nanoparticle (NP) compacts were used as supportive substrates for the synthesis of TiO2 nanowires (NWs) with controlled diameter via an alkali hydrothermal route. The hydrothermal treatment converted the TiO2 NPs on the compacts to TiO2 NWs. The diameter of each NW could be adjusted by changing the hydrothermal temperature and reaction time. The NWs grown on the compacts showed better stability in aqueous solution compared to those grown on conventional Ti metals. In vitro biocompatibility evaluation demonstrated that the NWs supported cell attachment and proliferation, with smaller diameter NWs showing enhanced effects. The synthesized TiO2 NWs have potential as novel biocompatible tissue regenerative matrix.
MATERIALS TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Shuaishuai Li, Ren Guo, Song Chen, Jianan Zhang, Toshiyuki Ikoma, Xiaona Li, Weiyi Chen
Summary: In this study, porous hollow hydroxyapatite (HAp) microspheres were successfully prepared using chitosan microspheres as sacrificial templates. The microstructure, biocompatibility, and drug delivery properties of HAp microspheres were evaluated. The results showed that the HAp microspheres had a spherical morphology with a porous and core-shell structure. They exhibited good biocompatibility and could support the attachment and proliferation of osteoblast cells. Furthermore, the HAp microspheres could adsorb and deliver a model drug, tetracycline hydrochloride (TH), and retain its biological activity to inhibit the growth of bacteria.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Ren Guo, Shuaishuai Li, Song Chen, Jianan Zhang, Toshiyuki Ikoma, Xiaona Li, Weiyi Chen
Summary: In this study, hydroxyapatite whisker membranes were used as biocompatible and recyclable filters for bacterial removal, achieving a filtration efficiency of 100% and allowing the membranes to be recycled and reused.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Hao Li, Jianan Zhang, Shuaishuai Li, Song Chen, Ren Guo, Toshiyuki Ikoma, Xiaona Li, Weiyi Chen
Summary: In this study, TiO2 hollow microspheres were successfully synthesized using chitosan/gelatin microspheres as both supporting matrix and sacrificial templates. The TiO2 hollow microspheres exhibited a spherical morphology with a hollow structure, and promoted cell attachment and proliferation.
Article
Materials Science, Multidisciplinary
Cunfang Zhang, Xinyan Zhang, Song Chen, Jianan Zhang, Shuaishuai Li, Xiaona Li, Toshiyuki Ikoma, Weiyi Chen
Summary: Novel silk fibroin-decorated TiO2 nanowire microspheres were successfully synthesized through in situ decoration method, and the presence of silk fibroin enhanced the biocompatibility of the microspheres.
Article
Pharmacology & Pharmacy
Ken Takahashi, Yasuhiro Nakagawa, Yu Sato, Ryo Wakita, Maeda Shigeru, Toshiyuki Ikoma
Summary: In this study, QX-OH was loaded onto carboxyl-functionalized mesoporous silica nanoparticles (MSN) using an ester-based drug loading method to achieve pH-responsive release. The introduction of an ester bond efficiently provided a local anesthetic via pH-responsive release.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hiroshi Kawamata, Dock-Chil Che, Masaaki Nakamura, Toshio Kasai
Summary: The photodissociation dynamics of 1-chloro-2-iodo-1,1,2-trifluoroethane (CF2ClCHFI) was studied using the slice imaging technique combined with an oriented molecular beam. The speed and angular distributions of the spin-orbit-selected I atoms were determined and the anisotropic parameters for the ground and excited states were calculated. The study also revealed that the transition dipole moment in photoabsorption was nearly parallel to the C-I bond axis, and a large amount of energy was distributed into the internal energy of the CF2ClCHF· radical, leading to the secondary reaction of C-Cl bond rupture.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Materials Science, Ceramics
Ren Guo, Congcong Rong, Song Chen, Jianan Zhang, Akiyoshi Osaka, Toshiyuki Ikoma, Xiaona Li, Weiyi Chen
Summary: In this study, chitosan/Fe3O4/TiO2@TiO2 nanowire microspheres with extracellular matrix-like fibrous surface and photothermal antibacterial property were synthesized. The microspheres significantly enhanced the attachment and proliferation of human umbilical vein endothelial cells and exhibited photothermal antibacterial activity due to the presence of nanofibrous surface and Fe3O4 component.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Yuta Aida, Yasuhiro Nakagawa, Tetsuo Kishi, Toshiyuki Ikoma
Summary: This study investigated the identification of star-shaped Au-Ag nanoparticles with spinous morphology using discrete dipole approximation and morphological symmetric consideration. By varying the Au/Ag ratio, nanoparticles with different aspect ratios and number of spines were obtained and their morphology was identified by comparing the optical absorption spectra with the calculated absorption efficiency. Taking the particle size distribution into consideration improved the calculation accuracy. In conclusion, this study demonstrated the potential of computational morphological identification in predicting nanoparticles with complexed morphology.
Review
Chemistry, Multidisciplinary
Dock-Chil Che, Hiroshi Kawamata, Masaaki Nakamura, Cheng-Jui Tso, Balaganesh Muthiah, Toshio Kasai
Summary: This review article discusses the branching selectivity in the photodissociation of asymmetric-top molecules, presenting examples of halothane CF3CHBrCl and isohaloethane CF2BrCHFCl. The unexpected branching ratio observed in the photodissociation of halothane suggests a preference for fragmentation through the strongly bounded Cl-C bond. In contrast, isohaloethane showed similar values for all-atom fragmentations. The author attributes these differences to curve crossing of excited states and non-adiabatic interactions.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2023)