Materials Literature
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Abstract Double stimuli‐responsive membranes are prepared by modification of pH‐sensitive integral asymmetric polystyrene‐ b ‐poly(4‐vinylpyridine) (PS‐ b ‐P4VP) diblock copolymer membranes with temperature‐responsive poly( N ‐isopropylacrylamide) (pNIPAM) by a surface linking reaction. PS‐ b ‐P4VP membranes are first…
We realized ambipolar field-effect transistors by coupling exfoliated thin flakes of tungsten disulfide (WS(2)) with an ionic liquid dielectric. The devices show ideal electrical characteristics, including very steep subthreshold slopes for both electrons and holes and extremely low OFF-state currents. Thanks to these…
In this perspective we discuss the roles of hot spots in surface-enhanced Raman spectroscopy (SERS). After giving background and defining the hot spot, we evaluate a variety of SERS substrates which often contain hot spots. We compare and discuss the differentiating properties of each substrate. We then provide a thor…
Density functional theory (DFT) computations were performed to investigate the electronic properties and Li storage capability of Ti(3)C(2), one representative MXene (M represents transition metals, and X is either C or/and N) material, and its fluorinated and hydroxylated derivatives. The Ti(3)C(2) monolayer acts as…
This paper focuses on the design of an innovative air-conditioning system, namely a magnetocaloric air-conditioner for an electric minibus. An integrated design of the complete system is necessary, as the hot and cold side of the regenerator will work under dynamic conditions which depend on the thermal load in the ca…
Abstract In the present article, the effect of γ‐ray irradiation of doses 14.85, 30, and 45 kGy on the thermomechanical and tensile properties of blends of cis ‐polyisoprene and trans ‐polyisoprene have been investigated. The results on thermomechanical properties show that glass transition temperature increases and h…
Dissipative particle dynamics (DPD) was initially used to simulate the polystyrene/nanoparticle composite microspheres (PNCM) in this paper. The coarse graining model of PNCM was established. And the DPD parameterization of the model was represented in detail. The DPD repulsion parameters were calculated from the cohe…
Scanning electron microscope (SEM) observation shows that tumblebug’s elytra are a kind of chitin fibre reinforced biocomposite. In the biocomposite, the chitin fibres possess a laminated microstructure and distribute in a kind of particular helicoidal pattern. More careful observation indicates that there is a kind o…
Atomistic simulations have been used to investigate the effect of a spatially distinct defect, i.e. stacking fault tetrahedron (SFT), on the inception of plastic deformation in a perfect copper single crystal during nanoindentation. An SFT positioned within a volume under significant stress from indentation lowers the…
Abstract Multiferroic materials, which show simultaneous ferroelectric and magnetic ordering, exhibit unusual physical properties–and in turn promise new device applications–as a result of the coupling between their dual order parameters. BiFeO 3 is currently considered the most promising candidate material for device…
We study the rotational dynamics of a supercooled molecular liquid by means of molecular dynamics simulations. The system under investigation is composed of rigid diatomic molecules with an associate dipole moment. At room temperature, orientational correlations decrease rapidly with increasing distances. Upon cooling…
A nice piece of KIT: The first synthesis of a new bimetallic 3D-cage-type mesoporous catalyst CuAl-KIT-5 and its remarkable performance for the highly selective synthesis of ortho-prenylated phenols and chromans is reported. As a service to our authors and readers, this journal provides supporting information supplied…
The water-soluble and high-quality ZnS:Mn 2+ /ZnS core–shell nanoparticles were synthesized by chemical precipitation method in an air atmosphere. The poly(methyl methacrylate) (PMMA) was used as a surfactant. Structural, morphology and optical properties were characterized by X-ray diffraction (XRD), transmission ele…
Abstract Off‐grade poly(ethylene terephthalate) (PET) of industrial manufacturers was partially depolymerized using excess ethylene glycol in the presence of manganese acetate as a transesterification catalyst to synthesize PET oligomers. Influences of reaction time, Ethylene Glycol (EG)/PET molar ratio, catalyst conc…
Deep level transient spectroscopy of both majority and minority carrier traps is performed in a n-type, nitrogen doped homoepitaxial ZnO layer grown on a m-plane by molecular beam epitaxy. Deep levels, most of them being not detected in undoped ZnO, lie close to the band edges with ionization energies in the range 0.1…
The authors report clear evidence of radiative and nonradiative energy transfer from CdSe quantum dots to Nd3+ ions in a glass system synthesized by melting method. An efficient control of energy transfer can be obtained by controlling the mean radius of the CdSe quantum dots. Increase of about 100% of the near infrar…
We compare nanoscale frictional characteristics of three types of chemically treated graphene nanoribbons (GNRs) via atomic force microscope. Measurements in both ambient and low humidity conditions demonstrate that covalently bonded functional groups have a significant impact on the frictional response of GNRs. The m…
Mutation of Arg427 and Arg472 in Rhizobium etli pyruvate carboxylase to serine or lysine greatly increased the activation constant (K(a)) of acetyl CoA, with the increase being greater for the Arg472 mutants. These results indicate that while both these residues are involved in the binding of acetyl CoA to the enzyme,…
Colloidal synthesis of inorganic materials is usually achieved in solvents under milder conditions of temperature than those usually used for the preparation of bulk compounds. As commonly shown on oxide nanoparticles with sizes of more than typically 20 nm, this leads to particles exhibiting an altered crystallinity…
A micelle-assisted wet-chemistry route is developed to synthesize pure and Zn-doped lead sulfide (PbS) quantum dots (QDs) and nanocrystals (NCs) under microwave irradiation. The formation mechanism includes three major steps, initialization of π-bonded complex, transformation into a micelle structure, and the dissipat…