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54th SPSJ Symposium on Macromolecules

作者： Otsuka, Hidenori Satomi, Tomomi Ueno, Koji Taniguchi, Akiyoshi Kobayashi, Hisatoshi Tanaka, Junzo Nagasaki, Yukio Kataoka, Kazunori Fujita, Yohei Biomaterials Center National Institute for Materials Science Graduate School of Pure and Applied Science University of Tsukuba Graduate School of Engineering University of Tokyo Department of Applied Chemistry Tokyo University of Science

Micropatterned PEGylated substrates with two-dimensional arrays of plasma-etched circular domains were prepared by coating of poly(ethylene glycol) (PEG) based polymer on the substrate, followed by plasma-etching through a metal mask pattern with circular holes. The PEGylated region on the patterned substrate works to repel proteins, consequently, inhibits cell adhesion. Then the micro-patterning of bovine articular chondrocytes or rat primary hepatocytes hetero-spheroids underlaid with endothelial cells was achieved on the plasma-etched circular domains, exposing the base substrate surface. PEG-g-pyridine copolymer was then synthesized for long-term cell culture, which is expected to have long stability, to overcome deterioration of polymer modified surface at room temperature and atmospheric conditions when single-point adsorption was employed.

关键词： Cells

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Recent advances in electronic devices for monitoring and modulation of brain

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Nano Research 2021年第9期14卷 3070-3095页

作者： Yong Won Kwon Yoon Sun Jun Young-Geun Park Jiuk Jang Jang-Ung Park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoul 03722Republic of Korea

The brain is actuated by billions of neurons with trillions of interconnections that regulate human *** the mechanisms of these systems that induce sensory reactions and respond to disease remains one of the greatest challenges in science,engineering,and *** advances in nanomaterials and nanotechnologies have led to the extensive research of electronic devices for brain interfaces to better understand the neural activities of the brains complex nervous *** development of sensor devices for monitoring the physiological signals of the brain related to traumatic injury status has accompanied by the progress of electronic neural probes in *** addition,these neurological and stereotactic surgical revolutions hold immense potential for clinical analysis of pharmacological systems within cerebral ***,we review the progress of electronic devices interfacing with brain in terms of the materials,fabrication technologies,and device *** activity can be measured and modulated by brain probes based on newly developed nanofabrication ***,in vivo pathological monitoring of the brain and pharmacological assessment has been developed in miniaturized and wireless *** also consider the key challenges and prospects for further development,and explore the future directions emerging in the latest research.

关键词： neural interfaces neural recording neuromodulation intracranial pressure monitoring microfluidic drug delivery

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Carbon Nanotube Coating on Titanium Substrate Modified with TiO_2 Nanotubes

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Journal of Wuhan University of Technology(materials science) 2011年第5期26卷 867-871页

作者：白玉 PARK Ilsong BAE Taesung KIM Kyounga WATARI Fumio UO Motohiro LEE Minho Department of Dental Biomaterials School of Dentistry and Institute of Oral BioscienceBrain Korea 21 ProjectChonbuk National University School of Materials Science and Engineering Inner Mongolia University of Technology Department of Conservative Dentistry Institute of Oral Bioscience and BK 21 ProjectSchool of DentistryChonbuk National University Biomedical Dental Materials and EngineeringDepartment of Oral Health ScienceGraduate School of Dental MedicineHokkaido University Advanced Biomaterials Section Graduate School of Medical and Dental SciencesTokyo Medical and Dental University

A combination of carbon nanotubes （CNTs） and titanium （Ti） modified with TiO2 nanotubes （TiO2 NTs） was fulfilled with the aim of improving bioactivity of Ti ***,well-ordered TiO2 NTs were prepared by the electrochemical anodization of Ti in an ethylene glycol electrolyte containing 1 wt% NH4F and 10 wt% H2O at 20 V for 50 min,followed by ***,the carboxylated CNTs were coated onto the TiO2 NTs using electrophoretic deposition （EPD） *** growth of hydroxyapatite （HA） on the samples was investigated by soaking them in simulated body fluid （SBF）.The result showed the CNTs-coated Ti with the modification of TiO2 NTs （CNTs-TiO2 NTs） was more efficient to induce HA formation than the CNTs-coated smooth Ti （CNTs-Ti）.The vitro cell response was evaluated using osteoblast cells （MC3T3-E1）.The good cell proliferation and strong cell adhesion could be obtained on the CNTs-TiO2 *** results indicated that CNT coating on the Ti modified with TiO2 NTs could be potentially useful for the periodontal ligament combination on dental implants.

关键词： carbon nanotubes TiO2 nanotubes apatite-forming ability cell adhesion

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Accessing the viscera: Technologies for interoception research

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Current Opinion in Neurobiology 2025年 93卷 103050-103050页

作者： Pang, Karen K.L. Mondal, Rajib Sahasrabudhe, Atharva Anikeeva, Polina Department of Brain and Cognitive Sciences Massachusetts Institute of Technology United States K. Lisa Yang Brain-Body Center Massachusetts Institute of Technology United States McGovern Institute for Brain Research Massachusetts Institute of Technology United States Research Laboratory of Electronics Massachusetts Institute of Technology United States MIT-Harvard Graduate Program in Health Sciences and Technology United States Department of Materials Science and Engineering Massachusetts Institute of Technology United States

Interoception, or the perception and regulation of body signals by the central nervous system, is critical for maintaining homeostasis and coordination of behaviors. Deciphering the mechanisms of interoception requires identifying pathways and decoding of diverse signals across the brain-body axis. These studies are enabled by tools to modulate and record physiological processes in the brain and visceral organs. While numerous advanced neurotechnologies are well-established in the brain, these techniques often offer limited utility for other organs, such as the gastrointestinal tract, heart, liver, or bladder. In this review, we highlight recent advances in technologies for recording and modulation of visceral organ physiology in small animals in vivo, with a focus on implantable bioelectronic organ interfaces that can be deployed in behaving animals. We discuss how such interfaces are made possible through innovations in materials and electronics and outline unmet technological challenges in interoception research. © 2025 Elsevier Ltd

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Static and dynamic mechanical properties of extracellular matrix synthesized by cultured chondrocytes

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materials science and engineering C 2004年第3期24卷 425-429页

作者： Miyata, Shogo Furukawa, Katsuko S. Ushida, Takashi Nitta, Yasuo Tateishi, Tetsuya Biomedical Engineering Laboratory Dept. of Mechanical Enginieering Graduate School of Engineering Hongo 7-3-1 Bunkyo Tokyo 113-8656 Japan Biomaterials Center Natl. Inst. for Materials Science Japan

Recently, an approach to restore cartilage defects, culturing autologous chondrocytes in vitro to create a three-dimensional tissue and then implanting the cultured tissue, has been developed. In this kind of approach, it is important to study whether the extracellular matrixes synthesized by cultured chondrocytes have appropriate mechanical property. In this study, we attempted to evaluate in detail mechanical properties of the extracellular matrix synthesized by chondrocytes in vitro. Therefore, we cultured bovine chondrocytes in agarose gel and assessed the changes in not only static but also dynamic mechanical properties during long-term culture. In addition, to assess the mechanical property of the extracellular matrix synthesized by chondrocytes only, we calculated the volume ratio of the extracellular matrix in agarose gel from the cross section and estimated the static Young's modulus of the extracellular matrix synthesized by cultured chondrocytes based on the Rule of Mixture. As a result, both the equilibrium aggregate modulus and dynamic Young's modulus of chondrocyte/agarose disks increased with time. The value of calculated modulus was larger than that of the pericellular matrix of cartilage explant. In conclusion, the biomechanical property of chondrocyte/agarose constructs and the matrix synthesized by chondrocytes were assessed in detail. © 2004 Elsevier B.V. All rights reserved.

关键词： Cartilage

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Alumina sol bonded castables for blast furnace main troughs. Part 1 - dispersants, gelling agents and secondary binders.

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Ceramics International 2025年

作者： L.B. Nascimento V.G. Domiciano V.C. Pandolfelli RHI Magnesita GmbH Technology Center Leoben Austria Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos Brazil RHI Magnesita Research and Development Center Contagem Brazil

Calcium aluminate cement (CAC) is broadly used in refractory compositions due to its advantages, although CaO can affect the castable’s hot properties when silica is present. The need for higher-temperature applications and tougher conditions has led to innovations in high-performance materials, focusing on reducing CAC content and using binders without CaO or SiO 2 . Although progress has been made in their application, these binders still have limitations. Colloidal alumina is particularly promising for generating a silica-free system with higher refractoriness and lower liquid phase formation, depending on the refractory composition. Based on these aspects, this work evaluated the influence of using colloidal alumina as a binder in refractory castables (Al 2 O 3 -SiC-C) for blast furnace main troughs, comparing its properties to a commercially available silica sol castable. The influence of different dispersants, gelling agents and secondary binders on the properties of both sol-bonded castables was investigated. The results indicated that citric acid was the most effective dispersant in providing suitable rheological behavior based on its interaction with alumina particles (electrostatic mechanism), magnesia sinter and calcium aluminate cement. Furthermore, using optimized amounts of citric acid, MgO and CAC, a colloidal alumina-bonded refractory composition with higher green mechanical strength and suitable working time was obtained compared to the colloidal silica castable used as reference.

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Unconventional assemblies of bisacylhydrazones:The role of water for circularly polarized luminescence

Aggregate

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Aggregate 2022年第5期3卷 185-193页

作者： Hye Jin Cho Dong Yeun Jeong Hwihyun Moon Taewoo Kim You Kyoung Chung Yeongdong Lee Zonghoon Lee Joonsuk Huh Youngmin You Changsik Song Department of Chemistry Sungkyunkwan UniversitySuwonGyeonggi 16419Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and EngineeringEwha Womans UniversitySeoul 03760Republic of Korea Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Department of Materials Science and EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Understanding the precise molecular arrangement of chiral supramolecular polymers is essential not only to comprehend complex superstructures like proteins and DNA but also for the development of next-generation optoelectronic materials,including materials displaying high-performance circularly polarized luminescence(CPL).Herein,we report the first chiral supramolecular polymer systems based on hydrazone–pyridinium conjugates comprising alkyl chains of different lengths,which afforded control of the apparent supramolecular *** supramolecular chirality is governed basically by the remote chiral centers of alkyl chains,helicity inversion was achieved by controlling the conditions under which the hydrazone building blocks underwent aggregation(i.e.,solvent compositions or temperature).More importantly,the addition of water to the system led to aggregationinduced hydrazone deprotonation,which resulted in a completely different selfassembly *** water molecules played an essential role,forming the assembly’s channel-like backbone,around which hydrazone molecules gathered as a result of hydrogen bonding *** co-assembly of an achiral hydrazone luminophore with the given supramolecular polymer system allowed the fabrication of a novel CPL-active hydrazone-based material exhibiting a high maximum value for the photoluminescence dissymmetry factor of -2.6×10^(-2).

关键词： circularly polarized luminescence(CPL) helicity control hydrazone self-assembly structural water supramolecular polymerization

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Mesenchymal stem cell culture on chitosan/DNA polyelectrolyte complexes

Mesenchymal stem cell culture on chitosan/DNA polyelectrolyt...

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8th World biomaterials Congress 2008, WBC 2008

作者： Kawazoe, Naoki Narita, Yujiro Chen, Guoping Satomi, Tadaatsu Tateishi, Tetsuya Biomaterials Center National Institute for Materials Science Tsukuba Ibaraki Japan Graduate School of Science and Engineering Tokyo Denki University Hiki-gun Saitama Japan

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Femtosecond laser-mediated anchoring of polymer layers on the surface of a biodegradable metal

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Journal of Magnesium and Alloys 2021年第4期9卷 1380-1388页

作者： Jaeho Park Bo-In Park Young Ju Son Sun Hee Lee Seung-Hoon Um Yu-Chan Kim Myoung-Ryul Ok Jeong-Yun Sun Hyung-Seop Han Hojeong Jeon Center for Biomaterials Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Mg has received much attention as a next-generation implantable material owing to its biocompatibility,bone-like mechanical properties,and biodegradability in physiological *** application of various polymer coatings has been conducted in the past to reduce the rapid formation of hydrogen gas and the local change in pH during the initial phase of the chemical reaction with the body ***,we propose femtosecond(fs)laser-mediated Mg surface patterning for significant enhancement of the binding strength of the coating material,which eventually reduces the corrosion *** of the structural,physical,crystallographic,and chemical properties of the Mg surface have been conducted in order to understand the mechanism by which the surface adhesion increases between Mg and the polymer coating *** on the fs laser conditions,the surface structure becomes rough owing to the presence of several microscaled pits and grooves of nanoporous MgO,resulting in a tightly bonded poly(lactic-co-glycolic acid)(PLGA)*** corrosion rate of the PLGA-coated,fs laser-treated Mg is considerably slow compared with the non-treated Mg;the treated Mg is also more biocompatible compared with the non-treated *** fs laser-based surface modification technique offers a simple and quick method for introducing a rough coating on Mg;further,it does not require any chemical treatment,thereby overcoming a potential obstacle for its clinical use.

关键词： Femtosecond laser Biodegradable metal Polymer coating Surface modification Surface adhesion

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Ionic oxidation in cathodic cage of titanium CP grade II

Ionic oxidation in cathodic cage of titanium CP grade II

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作者： Vitoriano, Jussier Oliveira Braz, Danilo Cavalcante Barbosa, Geovani Ferreira Araújo, Francisco Odolberto Alves, Clodomiro Post-Graduate Program in Materials Science and Engineering Universidade Federal Rural do Semi-Árido Brazil

Titanium oxides such as rutile and anatase, are materials that stand out for exhibiting properties that act in biomedical and photocatalytic applications, among others. It is extreme importance to idealize new techniques that produce such compounds, being indispensable the improvement of characterizations for these materials. For this purpose, titanium comercially pure (CP) grade II cylindrical samples were oxidized ionically using titanium cage electric shields, oxidized at 350 ° C in 3 and 8 hours. Through Grazing Incidence X-ray Diffraction (GIXRD) analysis, was observed on the surface of the treated samples the formation of a TiO2 film with the anatase, rutile and brookite phases, the latter phase cited being difficult to produce in conventional thermochemical treatments. All samples treated showed a significant increase in wettability using distilled water. The higer value was for the sample with a 8 hours treatment time, in which this condition presented phases with greater intensity in the analysis of GIXRD. © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Titanium dioxide

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