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We previously showed that the hybridization of water-insoluble 12-hydroxystearic acid (HSA) with water-soluble long-chain amidoamine derivatives yields hydrogels composed of self-assembled helical ...

Biopolyimides poly(ATA-CBDA) made from of 4,4′-diamino-α-truxillic acid dimethyl ester (ATA) and 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) were synthesized and its electric volume resis...

In this study, the efficiency of tail-to-tail dimerization of Michael acceptors catalyzed by N-heterocyclic carbene has been significantly improved. By increasing the reaction temperature to 200 °C...

A highly stereoselective Michael addition of α-amino acid-derived 2-benzyloxythiazol-5(4H)-ones to dimethyl allenedicarboxylate was developed by employing P-spiro chiral triaminoiminophosphorane bearing (S)-sec-butyl groups as a catalyst. Theoretical investigation of the transition-state models for the reaction and control experiments suggested the intervention of a dynamic kinetic resolution of the axially chiral allene acceptor. The synthetic utility of this method was demonstrated through the transformation of the stereochemically homogeneous Michael adduct to an α-vinylic α-amino acid derivative.

Bridge circuit based ionic current sensing in a microfluidic channel has attracted attention as a highly sensitive analytical method for bio-related molecules and particles. However, channel geometry which greatly influences the detected ionic current has not been investigated. Here, we investigate experimentally and theoretically the effect of differences in the microfluidic channel geometry on shapes and amplitude of signals in ionic current sensing. Our results clarify the geometrical effect of the channel in the bridge circuit based ionic current sensing method.

This study aims to report the hydrothermal synthesis of water-soluble Mn-doped ZnSe-ZnS alloy quantum dots (QDs), wherein manganese (Mn^2+) serves as an emission center. The alloy composition was controlled by the mixing ratio of ZnSe:Mn and ZnS:Mn precursor solutions....

Monomers of 4-vinylaniline, and 4-vinylpyridine were studied to investigate the influence of charges of the initiator on the dispersion stability of the new polymer particles created using soap-fre...

The magnetic response of storage modulus for polysaccharide magnetic hydrogels with high off-field modulus was investigated. Magnetic hydrogels with 3.0 wt % carrageenan or agar demonstrated drasti...

The relationship between magnetic-field sensitivity and the volume fraction of magnetic particles for magnetic elastomers was investigated. The magnetic-field dependence of the storage modulus for magnetic elastomers was measured by dynamic viscoelastic measurements under magnetic fields with a constant sweep rate of 3.7 mT s−1. The magnetic-field sensitivity was determined by the initial slope of the storage modulus using an exponential function. It was revealed that the maximum magnetic-field sensitivity was 1.8 × 10−2 mT−1 at the maximum volume fraction of magnetic particles.

We studied the effects of magnetic field strength and sample size on the magnetomechanical response for disk-shaped magnetic elastomers placed on a permanent magnet. The diameter of magnetic elastomer was varied between 14–40 mm, whereas the height was constant at 5 mm. The stress was measured with a unidirectional compression apparatus. It was found that the smallest magnetic elastomer with 14 mm diameter did not exhibit magnetomechanical response, on the other hand, clear response was observed for magnetic elastomers with 35 mm diameter. This sample size effect was observed at both 310 and 420 mT.

Thiocholine bromide was proposed as a cationic capping ligand for a variety of metal and semiconductor nanoparticles with a good dispersibility in an ionic liquid (IL). The stability of NPs was improved in the IL compared to that in water, which was verified by an improved emission property of semiconductor nanoparticles and higher thermal stability of gold nanoparticles. The cationic thiocholine was further demonstrated as a surface ligand for CdTe nanoparticle dispersible in organic media in combination with various anions. Thiocholine bromide was proposed as a capping ligand for a variety of metal and semiconductor nanoparticles with a good dispersibility in an ionic liquid. The cationic thiocholine further served as a surface ligand for CdTe NPs dispersible in organic media in combination with various anions.

A flow-injection spin-trapping ESR system using DMPO (5,5-dimethyl-1-pyrroline N-oxide) was developed for quantitative detection of the alkoxy radicals (•OR, R = C(CH3)2-C(+NH2Cl−)NH2) formed by th...

Over the past few decades, many studies have been conducted on ultralong C–C bonds (bond length greater than 1.7 A). This highlight review discusses the molecular design of ultralong C–C bonds and ...

Sound velocity of magnetic elastomers containing carbonyl iron and barium ferrite particles has been investigated by using an ultrasound pulse-echo method at 10 MHz. The sound velocity for magnetic elastomers containing barium ferrite was independent of the sample thickness, and the mean sound velocity was determined to be 1187 ± 5 m s−1. The sound velocity for magnetic elastomers containing carbonyl iron linearly decreased with the sample thickness, and the values (954–1031 m s−1) were lower than those of barium ferrite. Microphotographs revealed that carbonyl iron particles were randomly dispersed and barium ferrite particles were heterogeneously dispersed in the polyurethane matrix. The relationship between the sound velocity and the particle dispersibility is discussed.

We have investigated the transition from linear viscoelasticity to nonlinear viscoelasticity for bimodal magnetic elastomers under a magnetic field. For bimodal magnetic elastomers, the transition strain increased remarkably with the volume fraction of nonmagnetic particles. For monomodal magnetic elastomers, the transition strain also increased with the volume fraction of magnetic particles; however, the increment was not significant. A possible mechanism of the widening of the linear viscoelastic plateau by nonmagnetic particles is discussed.

Photodissociation of three oxime ester compounds was investigated using time-resolved electron paramagnetic resonance spectroscopy. Direct evidences for the appearance of methyl and iminyl radicals...

The self-assembly of Prussian blue nanoparticles and single-walled carbon nanotubes is demonstrated by using analytical TEM. The nanotube composites containing compositionally tunable Prussian blue...