Materials Literature
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The negative thermal expansion (NTE) and correlated magnetic and electrical transport properties of Mn 3 Ga x Si 1− x N were investigated. For pure Mn 3 GaN, there is a large NTE effect corresponding to the antiferromagnetic to paramagnetic transition. Very interestingly, when partial Ga was replaced by Si, the NTE pr…
Jump to it! 2D IR pressure-jump spectroscopy of adsorbed CO can be used to assess the accessibility and location of platinum nanoparticles supported on a zeolite and investigate the behavior of Pt atoms after thermal treatment (activation, catalytic reaction, sintering). Different Pt nanoparticle sintering mechanisms…
In this study, mesoporous or colloidal silica particles were incorporated into polystyrene matrices via melt blending or by styrene polymerization initiated from the particle surface. The relationships between the surface morphology of filler particles in polymer composites and their thermomechanical properties were i…
A straightforward method is presented for the preparation of homogeneous as well as structured polymer brushes on SiC substrates. The self-initiated photografting and photopolymerization (SIPGP) of styrene and N, N -dimethylaminoethyl methacrylate (MAEMA) allows the preparation of polymer brush layers directly and sel…
We show that the width of the longitudinal magnetoconductivity peaks in graphene related to the $N=1$ Landau level displays a power-law type temperature dependence, $\ensuremath{\Delta}\ensuremath{\nu}\ensuremath{\propto}{T}^{\ensuremath{\kappa}}$, with $\ensuremath{\kappa}=0.37\ifmmode\pm\else\textpm\fi{}0.05$. Simil…
Two different Pd complexes are supported on the mercaptopropyltrimethoxy silyl-functionalized mesoporous material KIT-6 and their activity in the Suzuki−Miyaura cross coupling reaction is examined. Remarkably, these materials show a much greater recyclability than the corresponding SBA-15-based materials, which lose a…
Zwitterionomers containing less than 13 mol % zwitterion functionality were synthesized using free radical copolymerization of n -butyl acrylate (nBA) and sulfobetaine monomers. X-ray scattering results revealed a two-phase morphology, which is typical of random ionomers with an ionomer peak at q ∼1.5 nm −1 . Swelling…
The liquid-liquid phase separation of a binary solvent can be arrested by colloidal particles trapped at the interface [K. Stratford, Science 309, 2198 (2005)]. We show experimentally that the colloidal network so formed can remain stable after fully remixing the liquids, creating a new type of gel in which colloids i…
The purpose of this work was to develop a novel nano-carrier with targeting property to tumor. In this study, pullulan acetate (PA) was synthesized by the acetylation of pullulan to simplify the preparation technique of nanoparticles. Folic acid (FA) was conjugated to PA in order to improve the cancer-targeting activi…
Elastic bicomponent networks with shape memory effect were obtained via cross-linking reactions of unsaturated polyester with methacrylates. Unlike conventional shape memory polymers, the new material is transparent, rubbery, and can be tailored to various transition temperatures by macromolecular engineering. Various…
Diorganotellurides efficiently catalyze the aerobic oxidation of organosilanes under photosensitized conditions to afford the corresponding silanols in excellent yield.
It is known that artificial neural network is a powerful scheme for function learning and modeling nonlinear loads. However, a direct application of artificial neural network for modeling time-varying loads may lead to inaccuracies. This paper presents an accurate neural-network-based method for modeling the highly no…
The first direct observation of the transient spin-state in a disordered magnetic system with time-resolved XAFS is reported. By observing the evolution of the Fe(II) 1s-3d transition, the spin crossover transition from the (1)A(1) low spin state to (5)T(2) high spin state has been directly observed on a picosecond ti…
MnO 2 ‐doped (K 0.5 Na 0.5 )NbO 3 (KNN) single crystals were grown by high‐temperature solution method using K 2 CO 3 –Na 2 CO 3 eutectic composition as flux. The effect of the manganese dopant on the dielectric, piezoelectric properties and the domain structure was investigated. The MnO 2 ‐doped KNN crystals were fou…
A novel optically transparent ceramic nanocomposite Y 2 O 3 –MgO was produced using spark plasma sintering technique. Sintering parameters was optimized to obtain fully dense material while maintaining nanoscale grain size. The sintered nanocomposite has an excellent infrared transmission as a result of small grain si…
A graft copolymer, poly(styrene sulfonic acid) grafted with polyaniline (PSSA- g -PANI), is synthesized and used as the hole transport layer in polymer solar cells based on poly(3-hexylthiophene) and [6,6]-phenyl- C 61-butyric acid methyl ester. Electrochemical stability of PSSA- g -PANI is superior to poly(3,4-ethyle…
Piezoresistivity was found in silicon oxycarbide (SiOC) ceramics synthesized using a polymer‐to‐ceramic transformation process. A commercial polysiloxane, namely poly(methylsilsesquioxane), was used as the starting material. The SiOC ceramic synthesized at 1400°C exhibits high piezoresistivity, leading to strain sensi…
In practical applications, global cluster structure optimisation has so far been limited largely to homogeneous clusters of atoms or small molecules, with little or no choice in the calculation of inter-particle forces. We eliminate these limitations by presenting a new program suite OGOLEM that is universal by design…
CdSe quantum belts (QBs) having lengths of 0.5-1.5 microm and thicknesses of 1.5-2.0 nm exhibit high photoluminescence (PL) efficiencies of approximately 30%. Epifluorescence studies establish the PL spectra to be uniform along single QBs, and nearly the same from QB to QB. Photogenerated excitons are shown to be effe…
Even 35 years after the discovery of surface-enhanced Raman spectroscopy (SERS) much remains to be learned about the phenomenon. (1-3) Despite broad consensus on the mechanism of SERS, many features remain poorly understood and in particular much less effort has been put into understanding the continuum emission calle…