A5029237569- Hydrogels: synthesis, properties, applications
- Pickering emulsions and particle stabilization
- Advanced Materials and Mechanics
- Liquid Crystal Research Advancements
- Advanced Polymer Synthesis and Characterization
- Surfactants and Colloidal Systems
- Advanced Sensor and Energy Harvesting Materials
- Polymer Surface Interaction Studies
- Magnetic properties of thin films
- Micro and Nano Robotics
- Nanomaterials and Printing Technologies
- Photonic and Optical Devices
- Thin-Film Transistor Technologies
- Material Dynamics and Properties
- Semiconductor Lasers and Optical Devices
- Surface Modification and Superhydrophobicity
- Physics of Superconductivity and Magnetism
- Organic Light-Emitting Diodes Research
- Viral-associated cancers and disorders
- Gold and Silver Nanoparticles Synthesis and Applications
- Electrostatics and Colloid Interactions
- Semiconductor Quantum Structures and Devices
- Optical Network Technologies
- Electrohydrodynamics and Fluid Dynamics
- Supramolecular Self-Assembly in Materials
Shinshu University
2016-2025
Okayama University
2005-2025
Ōtani University
2011-2023
The University of Tokyo
2004-2022
Okayama Saiseikai General Hospital
2017-2022
Yamanashi Prefectural Fisheries Technology Center
2011-2022
Mitsubishi Electric (Japan)
2001-2021
Shibaura Institute of Technology
2012-2021
Japan Science and Technology Agency
2008-2020
Ueda Womens Junior College
2018-2020
Nanogels and microgels are soft, deformable, penetrable objects with an internal gel-like structure that is swollen by the dispersing solvent. Their softness potential to respond external stimuli like temperature, pressure, pH, ionic strength, different analytes make them interesting as soft model systems in fundamental research well for a broad range of applications, particular field biological applications. Recent tremendous developments their synthesis open access complex architectures...
We present Janus microgels modified using a Pickering emulsion-based approach and demonstrate their self-assembly. Stimuli-responsive composed of cross-linked poly[N-isopropylacrylamide-co-(acrylic acid)] (pNA) were synthesized by means aqueous free-radical precipitation polymerization. Using pNA as stabilizers, emulsion was formed simple stirring with dispersion hexadecane. The amino groups then introduced carbodiimide coupling reaction ethylenediamine...
<h3>Objectives</h3> To determine the pathogenic association of latent Epstein-Barr virus (EBV) infections with both typical hydroa vacciniforme (HV) and severe HV-like eruptions, to survey complications outcomes patients. <h3>Design</h3> Case series. <h3>Patients</h3> Twenty-nine patients HV or eruptions. <h3>Interventions</h3> In situ hybridization immunostaining biopsy specimens; extraction DNA samples from cutaneous lesions and/or peripheral blood mononuclear cells for EBV assay. <h3>Main...
We report the formation of novel thermosensitive hybrid core−shell particles via in situ synthesis gold nanoparticles using as a template. The template particles, with cores composed mainly poly(glycidyl methacrylate) (GMA) and shells poly(N-isopropylacrylamide) (PNIPAM), were synthesized aqueous medium, functional groups such thiol incorporated into each particle. found that these containing effective for long-term storage. obtained exhibited reversible color change from red to purple,...
We report reversibly color changeable hybrid microgels that tune multiple brilliant colors due to interparticle interactions of SPR using several structured nanoparticles. The were brought out the thermosensitive swelling/deswelling property microgel. employ N-isopropylacrylamide (NIPAM) and glycidyl methacrylate (GMA) copolymerized (NG microgels) as templates for in situ synthesis Au seed nanoparticles could be stably grown by successive reduction Ag microgels. Interestingly, able exhibit...
Self-oscillating microgels have been obtained by introducing a Ru catalyst for the Belousov–Zhabotinsky (BZ) reaction into cross-linked copolymer. In this microgel system, chemical energy of BZ is converted to rhythmic swelling/deswelling with self-flocculating/self-dispersing oscillation around its phase-transition temperature (see scheme; Ru(bpy)3 denotes tris-bipyridine complex bearing vinyl group).
We present the assembly of colloidal crystals composed various thermoresponsive core/shell microgels and their hybrid microgel counterparts that contain localized Au nanoparticles. To obtain nanostructured microgels, we conducted a three-stage polymerization. First, core cross-linked poly(N-isopropylacrylamide) (pNIPAm) were synthesized by precipitation Using these as cores or "seeds", copolymer shell pNIPAm was added to particles using functional comonomer. Finally, second consisting solely...
Autonomously oscillating soft actuators have been successfully obtained by assembling pre-existing microgel particles. The amplitude of the actuator's oscillation could be controlled selecting types oscillations constituent microelements, i.e., swelling–deswelling or cooperative dispersing–flocculating motion microgels. new prepared this fabrication process make suitable for practical use in microfluidic devices such as self-beating micropumps.
We present autonomously oscillating viscosity in microgel dispersions. The microgels were obtained by introducing the Ru catalyst for Belousov−Zhabotinsky (BZ) reaction into a cross-linked copolymer. In this system, chemical energy of BZ is converted to rhythmic swelling/deswelling oscillation microgels. Moreover, self-flocculating/self-dispersing occurs near its phase transition temperature. Through use these two oscillations microgels, new function colloidal dispersions has been...
The drying mechanism of poly(N-isopropylacrylamide) (pNIPAm) microgel dispersions was investigated. microgels were synthesized by temperature-programmed aqueous free radical precipitation polymerization using NIPAm, N,N'-methylenebis(acrylamide), and water-soluble initiator. Drying processes the observed with a digital camera an optical microscope, resultant dried structures scanning electron microscopy. We found that presence changed behavior process water. In particular, adsorbed at...
Abstract Rotaxane cross‐linked (RC) microgels that exhibit a decoupled thermo‐ and pH‐responsive volume transition were developed. The pH‐induced changes of the aggregation/disaggregation states cyclodextrin in RC networks used to control swelling capacity entire microgels. Different from conventional microgels, which are usually obtained copolymerizations involving charged monomers, respond temperature as intended, even presence functional molecules such dyes microgel dispersion. results...
We propose a recycling strategy for tough polymers based on microparticles. The "microparticle-based" concept allows materials without loss of their properties (‘closed-loop’ recycling).
The structures of single microgels and microgel arrays at the air/water interface were directly visualized correlated with π – A isotherms to understand compression behavior soft deformable interface.
We report novel thermosensitive hybrid core−shell particles via in situ gold nanoparticle formation using as a template. This method for the synthesis of nanoparticles with microgel interiors offers advantage eliminating or significantly reducing particle aggregation. In addition, by structures which shell has and gel properties water−whereas core itself is water-insoluble polymer−we were able to synthesize only at surface core, had reactive sites bind metal ions. After synthesized,...
Journal Article Survival rates and prognostic factors of Epstein–Barr virus‐associated hydroa vacciniforme hypersensitivity to mosquito bites Get access T. Miyake, Miyake Department Dermatology Okayama University Graduate School Medicine, Dentistry Pharmaceutical Sciences 2‐5‐1 Shikata‐cho Kita‐ku 700‐8558 Japan Search for other works by this author on: Oxford Academic Google Scholar Yamamoto, Yamamoto JapanDepartment Kawasaki Medical Y. Hirai, Hirai M. Otsuka, Otsuka Hamada, Hamada K....
The deformation of soft hydrogel microspheres (microgels) adsorbed at the air/water interface was investigated for first time using large poly(<italic>N</italic>-isopropyl acrylamide)-based microgels synthesized by a modified aqueous precipitation polymerization method.
The reusability of hybrid core-shell microgels, whose core surfaces were decorated with gold nanoparticles, was investigated in terms catalysis activity. Hybrid microgels composed a rigid and water-swollen gel shell endowed the immobilized nanoparticles high dispersion stability, which resulted excellent catalytic In contrast to free Au conventional where are randomly distributed over entire microgel templates, hydrogel part suppressed aggregation between individual improved for reaction....
Self-oscillating microgel, which undergoes an autonomic and periodical swelling/deswelling oscillation, has been reported. The cross-linked microgels were synthesized by the copolymerization of N-isopropylacrylamide (NIPAm) with ruthenium tris(2,2′-bipyridine) [Ru(bpy)3] as a catalyst for Belousov−Zhabotinsky (BZ) reaction surfactant-free aqueous precipitation polymerization. self-oscillation was detected changes in optical transmittance. showed not only is synchronized redox oscillation...
Self-oscillation for the microgel particles ( approximately 200 nm in diameter) was studied by changing initial substrate concentrations (i.e., malonic acid, sodium bromate, and nitric acid) of Belousov-Zhabotinsky (BZ) reaction that is used chemical energy self-oscillation. The cross-linked microgels are composed N-isopropylacrylamide ruthenium tris(2,2'-bipyridine), Ru(bpy) 3, which a catalyst BZ reaction. Comparing with homogeneous, stirred solution bulk reaction, swelling/deswelling...