Materials Literature
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Abstract This contribution reports on the synthesis of hyperbranched polylysines via thermal polymerization of L ‐lysine hydrochloride. Polymerization of L ‐lysine hydrochloride in the presence of one equivalent KOH at 150 °C resulted in polymers with a number‐average molecular weight of 4600 g/mol and a polydispersit…
The ultrafast photoluminescence dynamics of nitride-passivated silicon nanocrystals is investigated using the variable stripe length geometry with 200 femtosecond pump pulses. We find that the luminescence lifetimes are in the nanosecond range throughout the entire spectral range. However, no evidence for optical gain…
Abstract A novel in‐site H 2 O 2 strategy is proposed for the liquid‐phase epoxidation of propene catalyzed by titanium silicalite (TS‐1). Said in‐site H 2 O 2 strategy is based on the direct synthesis of H 2 O 2 from H 2 and O 2 under atmospheric pressure via nonequilibrium plasma reactions. Methanol is used to absor…
Abstract The thermal behavior and spherulitic morphologies of poly( L ‐lactic acid) (PLLA)/poly( D ‐lactic acid) (PDLA) 1/1 blend with weight‐molecular‐weight of 10 5 order, together with those of pure PLLA and PDLA, were investigated using differential scanning calorimetry and polarized optical microscopy. It was fou…
Novel green and sustainable elastomers having both good biodegradability and chemical recyclability properties were designed and synthesized using potentially biobased materials and lipase as an environmentally benign catalyst. High molecular weight poly[(12-hydroxydodecanoate)-co-(12-hydroxystearate)] [poly(12HD-co-1…
Pb Ti O 3 – Bi Me O 3 (Me=Fe, Zn1/2Ti1/2, and Zn3/4W1/4) solid solutions exhibit unusually enhanced tetragonality (c/a). Lattice dynamics and structure of PbTiO3–BiMeO3 with enhanced c/a were investigated by Raman scattering technique and x-ray Rietveld method, respectively. The A1(1TO) soft mode, associated with the…
One of the fundamental goals in biology is to understand the complex spatiotemporal interplay of biomolecules from the cellular to the integrative level. To study these interactions, researchers commonly use fluorescent labeling for both in vivo cellular imaging and in vitro assay detection (1)(2). In this context, on…
Double and single vacancies differently affect the conductance of carbon nanotubes [G. Gómez-Navarro et al., Nat. Mater. 4, 534 (2005)], so that the exact knowledge of the abundance of these defects is mandatory for an unambiguous interpretation of irradiation-induced changes in nanotube conductance. We calculate conc…
Abstract A copolymer, poly(aniline‐ co‐o ‐aminophenol), was prepared chemically by using ammonium peroxydisulfate as an oxidant. The monomer concentration ratio of o ‐aminophenol to aniline strongly influences the copolymerization rate and properties of the copolymer. The optimum composition of a mixture for the chemi…
This paper presents a recently developed theory of colloid dynamics as an alternative approach to the description of phenomena of dynamic arrest in monodisperse colloidal systems. Such theory, referred to as the self-consistent generalized Langevin equation (SCGLE) theory, was devised to describe the tracer and collec…
Abstract In this article, the linear and nonlinear shear rheological behaviors of polylactide (PLA)/clay (organophilic‐montmorillonite) nanocomposites (PLACNs) were investigated by an Advanced Rheology Expanded System rheometer. The nanocomposites were prepared by master batch method using a twin‐screw extruder with p…
A new kind of carbon foam, which is based on the welding of single-walled carbon nanotubes, is built in a computer simulation. Its precisely defined architecture and all atomic positions allow one to perform detailed theoretical analysis of the properties. Such foam is as light as 19 of steel, while its stiffness is s…
Highly ordered linear C60 molecular-chain arrays with 2.31-nm interchain spacing (see image) are self-assembled on Ag(111) by using α-sexithiophene (6T) monolayer nanostripes on Ag(111) as a molecular surface nanotemplate. The subtle balance between molecule–molecule and molecule–substrate interactions facilitates the…
Nanocomposites offer a promising approach to incorporate nanostructured constituents to bulk thermoelectric materials. n-type CoSb3 nanocomposites were prepared by hot pressing the mixture of nanoscale and microsized CoSb3 powders synthesized by solvothermal method and melting, respectively. Microstructure analysis sh…
The magnetic properties of the double perovskite La2NiMnO6 polycrystalline sample have been investigated by magnetometry and electron spin resonance. The magnetization curve shows a paramagnetic-ferromagnetic transition at TC∼280K. However, the electron spin resonance spectra reveal that a pure paramagnetic regime onl…
The thermal conductance by phonons of a quasi-one-dimensional solid with isotope or defect scattering is studied using the Landauer formalism for thermal transport. The conductance shows a crossover from localized to Ohmic behavior, just as for electrons; however, the nature of this crossover is modified by delocaliza…
Lead-free alkali niobate piezoelectric ceramics with nominal compositions [(Na0.535K0.480)0.942+xLi0.058](Nb0.90Ta0.10)O3 compensated with Na and K at a fixed and optimized ratio of 0.535:0.480 were prepared by normal sintering. The electrical properties were investigated with a special emphasis on the influence of co…
It was recently reported that misoriented layered WSe2 and (W)x(WSe2)y films possess extremely low cross-plane thermal conductivity. Here, we report that the in-plane thermal conductivity results for WSe2 and W4(WSe2)10 films measured by using a suspended device are about 30 times higher than the cross-plane values be…
We investigate the temperature dependence of exciton fluorescence, absorption, and Stokes shift for five sizes of high quality $\mathrm{Cd}\mathrm{Se}∕\mathrm{Zn}\mathrm{S}$ nanocrystals from the perspective of the fine structure model and exciton-acoustic phonon coupling. The Stokes shift is found to have a weak temp…
The vibrational property and Raman spectra of carbon nanoribbons (CNRs) have been systematically studied by the density functional theory in the local density approximation. It is found that for all CNRs there are three typical Raman-active modes, i.e., the radial-breathing-like mode (RBLM), the localized mode and the…