A5011879468- Nuclear Physics and Applications
- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- Polymer Surface Interaction Studies
- Surface Modification and Superhydrophobicity
- Surfactants and Colloidal Systems
- Silicone and Siloxane Chemistry
- Force Microscopy Techniques and Applications
- Atomic and Subatomic Physics Research
- Theoretical and Computational Physics
- Lipid Membrane Structure and Behavior
- Fluid Dynamics and Thin Films
- High-pressure geophysics and materials
- Synthesis and properties of polymers
- Advanced NMR Techniques and Applications
- Material Dynamics and Properties
- X-ray Diffraction in Crystallography
- Spacecraft and Cryogenic Technologies
- Machine Learning in Materials Science
- Rheology and Fluid Dynamics Studies
- NMR spectroscopy and applications
- Radiation Detection and Scintillator Technologies
- Material Properties and Processing
Mie University
2014-2024
Guangdong Technion-Israel Institute of Technology
2019
Japan Atomic Energy Agency
2008-2019
Japan Proton Accelerator Research Complex
2019
University of Wollongong
2019
Technical University of Munich
2019
Comprehensive Research Organization for Science and Society
2018
High Energy Accelerator Research Organization
2003-2017
Material Physics Center
2016
Nagoya University
1995-2012
Super-hydrophilic polymer brushes were prepared by surface-initiated atom transfer radical polymerization of 2-methacryloyloxyethyl phosphorylcholine (MPC) on initiator-immobilized silicon wafers. The graft density was estimated to be ca. 0.22 chains nm−2 based the linear relationship between Mn and layer thickness. contact angle against water very low, air bubbles in hardly attached onto brush surface, indicating a super-hydrophilic surface. Neutron reflectivity measurements poly(MPC)...
The neutron instruments suite, installed at the spallation source of Materials and Life Science Experimental Facility (MLF) Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 beam ports 21 are in operation for user programs or under commissioning. A unique challenging instrumental suite been realized via combination a high-performance source, optimized scattering, using cutting-edge technologies. All are/will serve world-leading investigations broad range fields,...
Epoxy structural adhesives have been used extensively in the automotive and aerospace industries to bond assembly parts. Much effort has devoted enhancing mechanical properties of epoxy resin by incorporating fillers. Among a variety fillers investigated for this purpose, nanocelluloses are regarded as promising type emerging green filler material because their excellent physicochemical properties. Indeed, polymer nanocomposites. However, toughening reinforcing effects on rigid not yet fully...
A block copolymer of deuterated polystyrene (dPS) and 2-[2-(2-methoxyethoxy)ethoxy]ethyl methacrylate (PME3MA) spontaneously exposes the PME3MA block, which is soluble in water, to surface a vacuum. dPS−PME3MA mixed with (PS) segregates PS changes hydrophobic into hydrophilic surface. Neutron reflectivity, X-ray photoelectron spectroscopy, dynamic secondary ion mass spectrometry probe segregation due its block. Sum-frequency generation vibrational spectroscopy detects exclusively triethylene...
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTComparison of Interdiffusion Behavior between Cyclic and Linear Polystyrenes with High Molecular WeightsDaisuke Kawaguchi, Keisuke Masuoka, Atsushi Takano, Keiji Tanaka, Toshihiko Nagamura, Naoya Torikai, Robert M. Dalgliesh, Sean Langridge, Yushu MatsushitaView Author Information Department Applied Chemistry, Graduate School Engineering, Nagoya University, Furo-cho, Chikusa-ku, 464-8603, Japan; Faculty...
The electrode surface of a lithium battery was characterized using in situ reflectivity techniques and epitaxial thin films. Epitaxial LiFePO4 films were fabricated by pulsed laser deposition. Changes interfacial structures on the are determined X-ray neutron (NR) measurements an X-ray-transmission electrochemical cell. is stable during first charge/discharge process. NR analysis indicates reversible change concentration gradient ions at LiFePO4/electrolyte interface deintercalation.
Lamellar domain spacings (D) of blends a styrene-2-vinylpyridine (SP) diblock copolymer and homopolymers corresponding to the block polymers (S and/or P), which molecular weights are lower than that polymer, were examined by small-angle X-ray scattering (SAXS), dimensions chains in lamellae investigated neutron (SANS). The D's for SP/S/P ternary SP/S (or SP/P) binary increase with increasing weight homopolymers, MH, as well volume fraction ΦH, lamella. variations ΦH having different MH's...
Polyhedral oligomeric silsesquioxane (POSS) meets increasing interest as a building unit for inorganic-organic hybrid materials. The incorporation of cyclopentyl-substituted POSS (CpPOSS) into polystyrene (PS) thin films led to an inhibition dewetting. In this paper, the dispersion state CpPOSS in CpPOSS/PS and, furthermore, relationships between structure and dewetting effect are discussed. Structural analysis revealed that segregated film surface crystallized. segregation changes free...
We investigated the swelling behaviors of poly(vinyl alcohol) (PVA) films deposited on Si wafers with water vapor, which is a good solvent for PVA elucidating structural and dynamical heterogeneities in film thickness direction. Using deuterated differences direction can be detected easily as different degrees by neutron reflectivity. Consequently, degree saponification exceeding 98 mol % exhibits three-layered structure It considered that an adsorption layer consisting molecular chains are...
Segment distribution of styrene in an alternating lamellar structure styrene−2-vinylpyridine diblock copolymer was investigated by neutron reflection. Block copolymers having three types deuterium-labeled block chains consisting fully labeled, partially junction-labeled, and end-labeled were used this study. The degree junction end labeling varied to obtain a more complete picture segment distribution. Spin-coated thin films these on silicon wafers exhibited structures which oriented...
A newly designed 1.5th generation poly(amido amine) dendrimer with an azacrown core, hexylene spacers, and octyl terminals was spread on gold nanoparticle (Au-NP) suspension. The surface pressure-area isothermal curves indicated that the molecular area of Au-NP suspension significantly smaller than water, indicating formation dendrimer/Au-NP composites. Langmuir films were transferred to copper grids at various pressures observed by transmission electron microscopy. consisted a fractal-like...
The effect of composition distribution on microphase-separated structures AB diblock and BAB triblock copolymers was investigated at the molecular level by measurements neutron reflectivity. Monodispersed three poly(styrene)-d8-block-poly(2-vinylpyridine) (DP) labeled (PDP) unlabeled counterparts were synthesized a living anionic polymerization process designed to yield constant weight with different volume fractions. selective labeling method employs blending for segmental study while...
A novel neutron reflectometer with horizontal geometry will be established at BL16 in Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC) as a successor ARISA-II. ARISA-II corresponding to single beam downward 2.22 deg has achieved off-specular time-resolved reflectivity measurements. The is designed so receive two tilted beams (2.22 & 5.71 deg), which gives us an opportunity investigation on free liquid surface. can provide...
We investigated in detail the structures poly(vinyl alcohol) (PVA) adsorption layers on a Si substrate, which remained substrate after immersing relatively thick 30–50 nm films hot water, by neutron reflectometry under humid conditions. For PVA with degree of saponification exceeding 98 mol %, layer exhibits three-layered structure thickness direction. The bottom is considered to be so-called inner that not fully swollen water vapor. This may because polymer chains are strongly constrained...
The effect of salt concentration on the nanostructure a spread monolayer ionic amphiphilic diblock copolymer, (diethylsilacyclobutane)m-b-(methacrylic acid)n, at air−water interface was directly investigated by in situ X-ray reflectivity and neutron techniques. Previously, we had found that poly(methacrylic acid) (PMAA) hydrophilic layer under water not form simple polyelectrolyte brush but consisted dense carpet upper diffuse lower when chain long enough. Here observed this double formation...
Microphase-separated structures of a poly(deuterated styrene-block-2-vinylpyridine) (dPS-b-P2VP) block copolymer in thin films were studied by neutron reflectivity (NR) and transmission electron microtomography (TEMT). The dPS-b-P2VP shows cylindrical morphology the bulk state. was spun-coated on Si substrate, which extensively annealed (170 °C for 14 days) before NR experiments. film showed featureless profile, monotonically decreased with increasing scattering vector along depth direction...
The short-time mutual diffusion at an interface of linear polystyrene/linear deuterated polystyrene with different molecular weights was examined by time-resolved neutron reflectivity (TR-NR) measurements. model scattering length density (b/V) profiles obtained solving a partial differential equation for the process, using segmental coefficients as only fitting parameter were used to analyze TR-NR data. In diffusion, asymmetric derived from relaxation able data much better than those...
The effect of chain-end chemistry on surface and interfacial segregation in symmetric blends polystyrene (hPS)/deuterated (dPS) has been investigated by X-ray photoelectron secondary ion mass spectroscopy conjunction with neutron reflectivity measurements. Alpha,omega-fluoroalkyl- alpha,omega-carboxy-terminated polystyrenes (alpha,omega-hPS(Rf)2 alpha,omega-hPS(COOH)2) were used as end-functionalized polymers; the former possesses chain ends lower energies, latter higher energies compared...