Atsushi Takahara

Atsushi Takahara
Kyushu University | Kyudai · Institute for Materials Chemistry and Engineering

About

747
Publications
42,876
Reads
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21,911
Citations
Citations since 2016
158 Research Items
10937 Citations
201620172018201920202021202205001,0001,500
201620172018201920202021202205001,0001,500
201620172018201920202021202205001,0001,500
201620172018201920202021202205001,0001,500
Introduction
Skills and Expertise
Additional affiliations
October 2008 - present
Japan Science and Technology Agency (JST)
Position
  • Project Manager
April 2003 - present
Kyushu University
Position
  • Professor (Full)
April 2003 - present
Kyushu University
Position
  • Professor (Full)

Publications

Publications (747)
Article
This paper presents a facile method for fabricating a thin-film sample with a high asymmetry value of induced circularly polarized luminescence (iCPL) (|glum| = 2.0 × 10-3). The method involves mixing stereoregular poly(methyl methacrylate) (PMMA) and chiral chromophore (2,2,2-trifluoro-1-(9-anthryl)ethanol (TFAE)) to form a complex with a dynamic...
Article
Polyethyleneglycol 12 mol / polydimethylsiloxane co-polymer (PEG-12 dimethicone) is a type of polyether modified silicone (PEMS), which can form a lamellar liquid crystalline phase, and is widely used in cosmetics. The structural changes of PEG-12 dimethicone caused by water contents as well as shear flow were evaluated using simultaneous measureme...
Article
Plastic wastes in the oceans, rivers, and soil have become a serious issue in recent years, especially plastic fragments with the size of 5 mm or less, which are called microplastics (MPs). Characterization of MPs is complex because the weight of a single MP particle is less than 1 mg. In this study, microplastics collected from the surface layer o...
Article
Light produced by synchrotron radiation (SR) is much brighter than that produced by conventional laboratory X-ray sources. The photon energy of SR X-ray ranges from soft and tender X-rays to hard X-rays. Moreover, X-ray becomes element sensitive with decreasing photon energy. By using a wide energy range and high-quality light of SR, different scat...
Article
Full-text available
Advances in mechanistic understanding of integrin-mediated adhesion highlight the importance of precise control of ligand presentation in directing cell migration. Top-down nanopatterning limited the spatial presentation to sub-micron placing restrictions on both fundamental study and biomedical applications. To break the constraint, here we propos...
Article
The specific deformation behavior of crystalline polymer films, namely unoriented crystallized isotactic polypropylene (it PP) films, was investigated under a multiaxial stress field. Changes in the aggregation structure of the films were investigated during the bulge deformation process using in situ small-angle X-ray scattering, wide-angle X-ray...
Article
Isotactic polypropylene (iPP) is one of the most commonly used polymers owing to its excellent mechanical properties and well-balanced physical properties. These properties can be achieved and controlled through a better understanding of its hierarchical structures. The crystal structures of iPP thin films of ∼120 nm thickness formed on graphite an...
Article
Polysaccharides and “imogolite” (a natural aluminum silicate nanoclay) were used as building blocks to prepare environmentally benign (organic/inorganic) hybrid materials of natural origin. Cellulose nanocrystals (CNCs), cellulose fibers (CFs), and sacran were employed as polysaccharides. By utilizing oppositely charged organic and inorganic compon...
Article
Full-text available
Imogolite/chitosan hybrid films were prepared using pyridoxal-5'-phosphate (PLP) as an interfacial modifier. Thermogravimetric analysis and spectroscopic measurements revealed that the phosphate group of PLP was adsorbed on the imogolite. Furthermore, rheological measurements suggested that the PLP-modified imogolites (PLP-imogolite) had strong int...
Article
Full-text available
Comb-like polymers with pendant-like perfluorocarbon side chains self-assemble into smectic lamellae and have been extensively used as water-repellent, hydrophobic coating materials characterized by large water contact angles ( θ > 120°). As poly(perfluorooctyl acrylate) films are “ apparently hydrophobic” ( θ > 120°), the interaction of such mater...
Article
The construction of a deep learning model and visualization of judgment regions were conducted for X-ray diffraction and scattering images of aliphatic polyesters. Due to recent progress in measurement methods, a large amount of image data can be obtained in a short time; therefore, machine learning methods are useful to determine the important reg...
Article
X-ray photon correlation spectroscopy (XPCS) is a powerful tool for investigating the dynamics of polymer nanocomposites. In this study, XPCS was utilized to analyze the dynamics of a matrix-free nanocomposite consisting of poly(methyl methacrylate)-b-poly(butyl acrylate)-g-silica nanoparticles (PMMA-b-PBA-g-SiNPs) during uniaxial elongation and st...
Article
Full-text available
When isotropic solids are unequally stretched in two orthogonal directions, the true stress (force per actual cross-sectional area) in the larger strain direction is typically higher than that in the smaller one. We show that thiol-acrylate liquid crystal elastomers with polydomain texture exhibit an unusual tendency: The true stresses in the two d...
Article
The aggregation behaviors of a diblock copolymer and a triblock copolymer of poly(2-ethyl-2-oxazoline) (PEOX) and polyethylene oxide (PEO) in aqueous solutions were investigated mainly by static and dynamic light scattering and infrared spectroscopy. PEOX is a thermoresponsive polymer that is soluble in water at room temperature, but insoluble abov...
Article
The mechanical stretching behavior of the poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS) triblock copolymer (87 wt% polyethylene-co-butylene (PEB), 13 wt% polystyrene (PS)) was investigated under three different stretching modes and through in situ small-angle X-ray scattering (SAXS) analysis. The strain energy density function was investiga...
Article
Full-text available
We prepared a dielectric elastomer actuator composed of hydrogenated carboxylated acrylonitrile-butadiene rubber (HXNBR)/nitrile group (CN)-modified and non-modified titanium oxide (TiO2) particles with insulation properties. The CN group-containing silane coupling agent was synthesized via a thiol–ene reaction between acrylonitrile and 3-mercaptpr...
Article
Full-text available
A versatile wrinkle‐based micropatterned system with a film‐substrate structure is proposed, which contains a hydrophilic film of polyvinyl alcohol or its composite with laponite and a hydrophobic substrate of polydimethylsiloxane or its composite with carbon black. The wrinkled system features high design flexibility and multistimuli responsivenes...
Article
Marine mussels efficiently adhere under wet conditions by precisely controlling the hierarchical structure of the adhesive plaque through sequential mussel foot protein secretion in the foot-tip cavity. Chemical analysis of the non-uniform mussel plaque morphology has been performed using spectromicroscopy; however, the mesoscopic morphology has no...
Article
‘Imogolite’, a tubular inorganic nanotube surface, was modified with a peptide oligomer to prepare a hybrid hydrogel. The formation of the gels was confirmed by conducting a vial inversion test and rheological measurements. The surface modification of imogolite with the peptide oligomer was verified by performing thermogravimetric analysis and circ...
Preprint
Full-text available
Mechanical stretching behavior of poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS) triblock copolymer (87 wt% polyethylene-co-butylene (PEB) block, 13 wt% polystyrene (PS) block) was investigated by three different stretching and in situ small angle X ray scattering (SAXS) measurements. Strain energy density function was investigated based on...
Article
Crystalline polymers have a hierarchical structure in which polymer chains are folded. Although each hierarchical structure strongly affects the physical properties of crystalline polymers, it is hard to describe the relationship between the formation conditions, crystal structure and physical properties. We used Random Forest regression to compreh...
Article
Polarizing observation was carried out for nylon 12 (Ny12) films with a notch of ca. 0.2 mm length during uniaxial elongation. As the result, a ductile deformation behavior was detected, and a X-shaped area with higher retardation was observed around the notch extending to 45˚inclined direction to the uniaxial elongation direction. Moreover, during...
Article
Full-text available
We synthesized silica-coated barium titanate (BaTiO3) particles with different silica shell thicknesses and evaluated the effect of silica coating on the relative dielectric properties of silica-coated BaTiO3 particles. Furthermore, composite elastomers were prepared using hydrogenated carboxylated acrylonitrile–butadiene rubber (HXNBR) with a high...
Article
Adhesives for carbon fiber-reinforced poly (etheretherketone) (CFR-PEEK) have attracted the interest of researchers as an effective means for bonding this newly developed lightweight and high-performance composite structures. In this study, we developed a method to overcome the lack of interaction between adherends and adhesives through the modific...
Article
Full-text available
The complicated structure-property relationships of materials have recently been described using a methodology of data science that is recognized as the fourth paradigm in materials science. In network polymers or elastomers, the manner of connection of the polymer chains among the crosslinking points has a significant effect on the material proper...
Article
Anionic polymerization of methacrylate-functionalized ionic monomers, 2-(methacryloyloxy)ethyltrimethylammonium chloride (MTAC) and 3-(N-2-methacryloyloxyethyl-N,N-dimethyl)-ammonatopropanesulfonate (MAPS), was performed using conventional alkyl lithium as an initiator in ionic liquid, leading to poly(MTAC) (PMTAC) and poly(MAPS) (PMAPS). During an...
Article
Poly(etheretherketone) (PEEK) is a high-performance engineering thermoplastic with high heat deflection temperature. Owing to its low surface free energy, the untreated PEEK adherend may exhibit low bond shear strength with epoxy adhesives. This work presents a method to improve the adhesion performance of PEEK with epoxy adhesives through poly(gly...
Article
Full-text available
Light produced by synchrotron radiation (SR) is much brighter than that produced by conventional laboratory X-ray sources. The photon energy of SR X-ray ranges from soft and tender X-rays to hard X-rays. Moreover, X-rays become element sensitive with decreasing photon energy. By using a wide energy range and high-quality light of SR, different scat...
Article
Polyzwitterions have emerged as a new class of anti-fouling materials alternating poly(ethylene glycol). The exemplary bio-passivation and lubrication behaviors are often attributed to the particular chemical structure of zwitterions which involve a large dipole moment of the charged groups and a neutral net-charge, while the hydration state and dy...
Article
Acrylonitrile-butadiene rubbers (NBRs) have a lower glass transition temperature (Tg) and a higher dielectric constant than other rubbers. To understand how a low Tg and a high dielectric constant are compatible, we focused on the acrylonitrile (AN) monomer sequence in rubber and synthesized random and alternating copolymers to evaluate the effect...
Article
This study investigates the effect of ionic liquids (ILs) on the anionic polymerization of methyl methacrylate (MMA). Polymethyl methacrylate (PMMA), an isotactic polymer, is prepared by anionic polymerization at a high reaction temperature with an IL that acts as both solvent and additive. The most plausible reaction mechanism is determined using...
Article
Hard segments of polyurethanes (PUs) are generally formed from diisocyanate and diol. Diol can be replaced with triol and thiol. These chemical structures of hard segments strongly affect not only a microphase separated structure but mechanical properties of resultant PUs. In this review, we focus on the relationship between chemical structure like...
Article
A highly effective aqueous lubrication strategy employing electrostatic assembly of a negatively charged ultra-high molecular weight natural polysaccharide named “Sacran” and a positively charged poly[2-(methacryloyloxy)ethyltrimethyl ammonium chloride] (PMTAC) brush was investigated. The PMTAC brush was compressed through the adsorption of Sacran...
Article
A hydrolysis-resistant polymer bearing new quasi-choline phosphate (quasi-CP) structures as side groups, poly(2-methacryloyloxyethyl choline methylphosphonate) (PMCPm), was designed and synthesized. Radical polymerization and sub-surface-initiated radical polymerization were used to prepare homo-polymer and polymer brush on polymer substrates. Hydr...
Article
Polylactide (PLA) exhibits various types of crystal modifications depending on the preparation conditions, including the components. To solve the open question, a reliable calculation method for crystallinity, crystal forms, and composition in neat PLA and PLA composites was developed on the basis of temperature-dependent synchrotron wide-angle X-r...
Article
The molecular aggregation structure and surface properties of a catechol-bearing fluoropolymer, P(FAC8-co-DOPAm), which was synthesized by conventional radical copolymerization of 2-(perfluorooctyl)ethyl acrylate (FAC8) and N-(3,4-dihydroxyphenethyl)acrylamide (DOPAm), and its application to the superamphiphobic surfaces are presented. The crystall...
Article
Surface functionalization tailors the interfacial properties without impacts on the mechanical strength, which is beneficial for industry and daily applications of various metallic materials. Herein, a two-step surface functionalization strategy, (1) catechol-mediated immobilization of clickable agent and (2) postfunctionalization based on thiol–en...
Article
Reinforcement of the interfacial interaction between epoxy adhesives and metallic materials was achieved using polyglycidylmethacrylate (PGMA) with N-(3,4-dihydroxyphenethyl) methacrylamide (DOPAm) fragments. The copolymer, namely P(GMA-co-DOMAm), was synthesized via reversible addition-fragmentation chain-transfer polymerization. Because of the ca...
Article
A free-standing (biomacomolecule/natural inorganic nanotube) hybrid film was fabricated through alternative layer-by-layer (LBL) assembly of sacran and imogolite nanotubes. Sacran is a natural polysaccharide extracted from the cyanobacterium Aphanothece sacrum, while imogolite is a natural tubular aluminosilicate clay found in volcano ash. The hybr...
Article
A fluorosurfactant based on 3,3,3-trifluoropropene (TFP) telomer was synthesized as an environmentally friendly alternative to perfluorooctanoic acid (PFOA) using TFP and 2-iodoperfluoropropane ((CF3)2CF–I) as starting materials. TFP telomerization was initiated by addition of di-tert-butylperoxide in the presence of (CF3)2CF–I as a chain transfer...
Article
A conductive polymer thin film having coline phosphate as side group was prepared. Quartz crystal microbalance (QCM) was employed to evaluate the adsorption of the model protein, bovine serum albumin...
Article
Natural rubber (NR) films from various mixing ratios of large- (LRP) and small rubber particles (SRP) were prepared through latex and solution casting methods. Film-forming behaviours of the resulting films were investigated by monitoring their surface characteristics using atomic force microscopy (AFM). When the SRP portion was higher, the surface...
Article
There have been several reports investigating independent properties of large- (LRP) and small rubber particles (SRP). This work envisaged that, when co-existing, they could offer exceptional viscoelastic and mechanical properties from both components. Latex samples of various mixing ratios were prepared and properties of their rubber films were in...
Article
Solid films of deoxyribonucleic acid (DNA) containing a hydrated ionic liquid, choline dihydrogen phosphate (CDP), were prepared by a solvent-casting method. Thermal properties, aggregation structure, thermal molecular motion, and tensile properties of CDP-containing DNA films were examined by thermogravimetry (TG), wide angle X-ray diffraction (WA...
Article
Full-text available
The porous shell structure of liquid marbles allows liquid vapor to enter in/out of the liquid marbles, leading to the deformation/collapse of liquid marbles, which limits their application as miniature reactors for long-term chemical reactions. In this study, to prevent volatilization and maintain long-term stability, stable liquid marbles were fa...
Article
Block copolymers of poly (l-lactic acid) (PLLA) and polystyrene with different lengths of PLLA blocks entered into the network structures of PLLA gels formed with complex crystals with solvent molecules. The induced changes of the structure and the flow temperature of the gels were investigated to elucidate the mechanism of the block copolymers to...
Article
The scratch test was conducted for polycarbonate (PC) and poly(methyl methacrylate) (PMMA) with a load-progressive mode. Changes in the molecular aggregation structure of PC and PMMA induced by the scratch test were investigated based on polarized optical microscopic observation and small-angle X-ray scattering (SAXS) measurement. The scratching co...
Article
Liquid repellency of comb-shaped polyacrylates with perfluoroalkyl side-chains associates with the ordered structure of the side-chains at the surface. The molecular aggregation structure and surface properties of poly{2-[(perfluorohexylethyl)carbamate]ethyl}acrylate (PFAUr-C6) were studied using differential scanning calorimetry (DSC), polarized o...
Article
Owing to the increasing environmental awareness, nanocellulose/ natural clay composites with improved mechanical performance have attracted growing interest due to their eco-friendly properties. In this study, hybrid films composed of cellulose nanofibers (CNF) and imogolite nanotubes (natural aluminosilicate nanotubes) were fabricated. We mainly s...