Hiroki Iwase
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View article: Velocity gradient dependent structures of 12–2–12 wormlike micelles: insights from small-angle neutron scattering in the 1–2 shear plane
Velocity gradient dependent structures of 12–2–12 wormlike micelles: insights from small-angle neutron scattering in the 1–2 shear plane Open
The velocity gradient dependent shear-induced structural evolution of wormlike micelles (WLMs) formed by a gemini-type cationic surfactant (12–2–12) in an aqueous solution was investigated using small-angle neutron scattering (SANS). To ac…
View article: Upgrade of the KWS-2 high-intensity/extended-<i>Q</i>-range SANS diffractometer of JCNS for soft matter and biophysics: <i>in situ</i> SEC, controlled <i>in situ</i> RH/T variation and WANS detection
Upgrade of the KWS-2 high-intensity/extended-<i>Q</i>-range SANS diffractometer of JCNS for soft matter and biophysics: <i>in situ</i> SEC, controlled <i>in situ</i> RH/T variation and WANS detection Open
The KWS-2 small-angle neutron scattering (SANS) diffractometer operated by Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum, Garching, Germany, is dedicated to the investigation of mesoscopic multi-scale structures …
View article: Quasielastic neutron scattering study on low-hydrated myoglobin inside silica nanopores
Quasielastic neutron scattering study on low-hydrated myoglobin inside silica nanopores Open
In this study, nanosecond-scale dynamics of low-hydrated myoglobin (Mb) encapsulated in mesoporous silica (MPS) with 7.8 nm pores was investigated by using high resolution (energy resolution: 1 μeV) neutron backscattering spectroscopy. The…
View article: Polyelectrolyte-protein synergism: pH-responsive polyelectrolyte/insulin complexes as versatile carriers for targeted protein and drug delivery
Polyelectrolyte-protein synergism: pH-responsive polyelectrolyte/insulin complexes as versatile carriers for targeted protein and drug delivery Open
The co-assembly of polyelectrolytes (PE) with proteins offers a promising approach for designing complex structures with customizable morphologies, charge distribution, and stability for targeted cargo delivery. However, the complexity of …
View article: Development of Cryogenic HPLC for Wide Range Low Temperatures Using Liquefied Propane as Mobile Phase and Its Application to Hydrogen/Deuterium Compounds Separation
Development of Cryogenic HPLC for Wide Range Low Temperatures Using Liquefied Propane as Mobile Phase and Its Application to Hydrogen/Deuterium Compounds Separation Open
In this study, a novel cryogenic high-performance liquid chromatography (HPLC) system, where the separation temperature can be controlled from -196 to -50 °C, was developed using liquefied propane as the mobile phase. Pyrene retention in a…
View article: Fibrillization Process of Human Amyloid-Beta Protein (1–40) under a Molecular Crowding Environment Mimicking the Interior of Living Cells Using Cell Debris
Fibrillization Process of Human Amyloid-Beta Protein (1–40) under a Molecular Crowding Environment Mimicking the Interior of Living Cells Using Cell Debris Open
Molecular crowding environments play a crucial role in understanding the mechanisms of biological reactions. Inside living cells, a diverse array of molecules coexists within a volume fraction ranging from 10% to 30% v/v. However, conventi…
View article: Extended <i>Q</i>-range small-angle neutron scattering to understand the morphology of proton-exchange membranes: the case of the functionalized syndiotactic-polystyrene model system
Extended <i>Q</i>-range small-angle neutron scattering to understand the morphology of proton-exchange membranes: the case of the functionalized syndiotactic-polystyrene model system Open
Semi-crystalline polymers exhibit microphase separation into crystalline and amorphous domains characterized by multiple structural levels with sizes ranging from ångströms to hundreds of nanometres. The combination of small-angle (SANS) a…
View article: Effect of water content on stratum corneum penetration mechanism of W/O type microemulsions
Effect of water content on stratum corneum penetration mechanism of W/O type microemulsions Open
The stratum corneum (SC) consists of a lipid layer that forms two types of lamellar structures: short lamellar (S-La) and long lamellar (L-La).
View article: Conformation and Structure of Hydroxyethyl Cellulose Ether with a Wide Range of Average Molar Masses in Aqueous Solutions
Conformation and Structure of Hydroxyethyl Cellulose Ether with a Wide Range of Average Molar Masses in Aqueous Solutions Open
The solution properties of a water-soluble chemically modified cellulose ether, hydroxyethyl cellulose (HeC), were examined using static light scattering (SLS), dynamic light scattering (DLS), small-to-wide-angle neutron scattering (S-WANS…
View article: Elongated Rodlike Particle Formation of Methyl Cellulose in Aqueous Solution
Elongated Rodlike Particle Formation of Methyl Cellulose in Aqueous Solution Open
The conformation and structure of methyl cellulose (MC) ether samples dissolved in pure water under dilute conditions were carefully reconsidered based on the results obtained using small-to-wide-angle neutron scattering (S-WANS), static l…
View article: Evidence of Long Two-Dimensional Folding Chain Structure Formation of Poly(vinylidene fluoride) in <i>N</i>-Methylpyrrolidone Solution: Total Form Factor Determination by Combining Multiscattering Data
Evidence of Long Two-Dimensional Folding Chain Structure Formation of Poly(vinylidene fluoride) in <i>N</i>-Methylpyrrolidone Solution: Total Form Factor Determination by Combining Multiscattering Data Open
Very recently, we proposed that poly(vinylidene fluoride) (PVDF) dissolves in a long rectangular column conformation induced by the formation of a two-dimensional folding chain structure in an N-methylpyrrolidone (NMP) solution based on th…
View article: On the Proton Conduction Pathways in Polyelectrolyte Membranes Based on Syndiotactic-Polystyrene
On the Proton Conduction Pathways in Polyelectrolyte Membranes Based on Syndiotactic-Polystyrene Open
When functionalized by the solid-state sulfonation process, the amorphous regions of the semi-crystalline syndiotactic-polystyrene (sPS) become hydrophilic, and thus can conduct protons upon membrane hydration, which increases the interest…
View article: Neutron Reflectometry & Simultaneous Measurements of Rheology and Small Angle Neutron Scattering Studies for Polyether Modified Silicone Vesicle Systems
Neutron Reflectometry & Simultaneous Measurements of Rheology and Small Angle Neutron Scattering Studies for Polyether Modified Silicone Vesicle Systems Open
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 o…
View article: Star-Polymer-DNA Gels Showing Highly Predictable and Tunable Mechanical Responses
Star-Polymer-DNA Gels Showing Highly Predictable and Tunable Mechanical Responses Open
Dynamically crosslinked gels are appealing materials for applications that require time-dependent mechanical responses. DNA duplexes are ideal crosslinkers for building such gels because of their excellent sequence addressability and flexi…
View article: Contrast Variation Small-Angle Neutron Scattering Study of Solubilization of Perfumes in Cationic Surfactant Micelles
Contrast Variation Small-Angle Neutron Scattering Study of Solubilization of Perfumes in Cationic Surfactant Micelles Open
Perfume solubilization is an important process in the production of commercial products such as beverages, foods, and cosmetics. In the present study, small-angle neutron scattering (SANS) experiments were performed to investigate the solu…
View article: Distinguishing Adsorbed and Deposited Ionomers in the Catalyst Layer of Polymer Electrolyte Fuel Cells Using Contrast-Variation Small-Angle Neutron Scattering
Distinguishing Adsorbed and Deposited Ionomers in the Catalyst Layer of Polymer Electrolyte Fuel Cells Using Contrast-Variation Small-Angle Neutron Scattering Open
The ionomers distributed on carbon particles in the catalyst layer of polymer electrolyte fuel cells (PEFCs) govern electrical power via proton transport and oxygen permeation to active platinum. Thus, ionomer distribution is a key to PEFC…
View article: Reconsideration of the conformation of methyl cellulose and hydroxypropyl methyl cellulose ethers in aqueous solution
Reconsideration of the conformation of methyl cellulose and hydroxypropyl methyl cellulose ethers in aqueous solution Open
A rod-like structure with once-folded highly extended hairpin-like conformation is constructed from methyl and hydroxypropyl methyl cellulose ethers in aqueous solution.
View article: The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-Range Contrast Variation SANS
The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-Range Contrast Variation SANS Open
Membranes based on sulfonated synditoactic polystyrene (s-sPS) were thoroughly characterized by contrast variation small-angle neutron scattering (SANS) over a wide Q-range in dry and hydrated states. Following special sulfonation and trea…
View article: The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS
The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS Open
Membranes based on sulfonated synditoactic polystyrene were thoroughly characterized by contrast variation SANS over a wide Q-range in dry and hydrated states. The film samples were prepared by solid-state sulfonation that allowed a unifor…
View article: Small-angle Neutron Scattering Study of Micelle Structure and Hydration Behavior of Oleic Acid-based Gemini Surfactant
Small-angle Neutron Scattering Study of Micelle Structure and Hydration Behavior of Oleic Acid-based Gemini Surfactant Open
Herein, we characterized the micelle structure and hydration behavior of oleic acid-based gemini surfactants by small-angle neutron scattering. A larger counterion size (Li+ < Na+ < K+ < Cs+) resulted in decreased aggregation number (Nagg)…
View article: Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J‑PARC)
Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J‑PARC) Open
The Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC) is a landmark large user-facility producing neutron and muon beams. Those beams feed over 20 beamlines hosting world-class…