Materials Literature
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Acoustic streaming is an important phenomenon observed in sonochemical reactors controlling the physical effects due to the cavitation. Not many efforts are observed, however, in exact quantification of the generated liquid circulation currents, experimentally or theoretically. The present work has been directed at qu…
Sensitive and specific: By using surface-enhanced Raman scattering (SERS) microspectroscopy, solid-phase-bound compounds can be detected directly and marker-free in a few seconds on a single polystyrene bead. No significant contributions of the matrix are observed, as demonstrated by reference Raman spectra.
Founded in 1683 in Leiden, the Netherlands, Brill is a leading international academic publisher in the Humanities, Social Sciences, International Law, and Biology. With offices in the Netherlands, Germany, Austria, the USA and Asia, Brill today publishes more than 360 journals and 2,000 new books and reference works e…
The optimum length of silver nanorods for surface-enhanced Raman scattering (SERS) was studied. Uniform silver nanorods in diameter and length were fabricated on porous anodic aluminum oxide templates prepared in sulfuric acid, and their lengths were varied by controlling the electrodeposition time. The diameter of th…
Motivated by the observation of a gapless spin liquid state in $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$, we analyze the anisotropic triangular lattice $S=1/2$ Heisenberg model with the resonating valence bond mean-field approximation. Paying attention to the small quasi-one-dimensional anisotropy of the material, we take…
We have established the cohesive law for carbon nanotube (CNT) walls in multi-wall CNTs. The interactions between CNT walls are characterized by the van der Waals force. The tensile cohesive strength and cohesive energy are given in terms of the area density of CNT and parameters in the van der Waals force. For an inf…
Local segmental relaxation properties of poly(methylmethacrylate) (PMMA) of varying molecular weight are measured by dielectric spectroscopy and analyzed in combination with the equation of state obtained from PVT measurements. Significant variations of glass transition temperature and fragility with molecular weight…
Oleoylchitosans (O-chitosans), with different molecular masses and degrees of substitution (DS), were synthesized by reacting chitosan with oleoyl chloride. The FT-IR suggested the formation of an amide linkage between amino groups of chitosan and carboxyl groups of oleic acid. The viscosity of O-chitosan sharply incr…
High Resolution Image Download MS PowerPoint Slide Previous work on propylene epoxidation using H 2 /O 2 over Au/TS-1 catalysts indirectly supports a “sequential” mechanism: (1) H 2 O 2 formation from H 2 /O 2 on Au and (2) propylene epoxidation using H 2 O 2 on Ti-defect sites. On the contrary, recent kinetic studies…
Several zeolites, such as faujasite, mordenite, and ZSM-5, with various aluminum contents have been used to analyze the effect of aluminum or cation concentration (strength of electrostatic field) on hydrogen adsorption at low temperature. Irrespective of the zeolite structure, the adsorption capacity, isosteric heat…
Abstract Different types of polymer nanocomposites on the base of polystyrene, polymethylmethacrylate, and polycarbonate with alumina and SiO 2 nanoparticles and carbon nanotubes have been studied. Miniaturized, microdimensional samples were used, enabling a good control of morphology and distribution of particles by…
The Zn II complexes of triazacyclononane-functionalized DAB dendrimers are powerful catalysts for the cleavage of an RNA model substrate with clear evidence of cooperativity between two metal centers.
The distance- and polarization-dependent near-field enhancement of two coupling metal nanoparticles (MNPs) is analyzed by means of the novel scanning particle enhanced Raman spectroscopy (SPRM) technique. In contrast to single MNP Raman experiments, the near-field coupling between two dissimilar MNPs as followed here…
Mesoporous silicas with various morphologies and structures were synthesized with the aid of 2,2,4-trimethylpentane (TMP) in the presence of nonionic surfactant P123 [(EO)20(PO)70(EO)20] as a structure-directing agent under mild reaction conditions (HAc-NaAc buffer solution, pH 4.4). The ropelike particles formed by e…
Carbohydrate residues are found on the extracellular side of the cell membrane. They form a protective coating on the outer surface of the cell and are involved in intercellular recognition. Synthetic carbohydrate-based polymers, so-called glycopolymers, are emerging as important well-defined tools for investigating c…
Layered tantalum oxide, RbTaO3, was delaminated into colloidal TaO3 unilamellar crystallites, which are characterized by an open-channel structure as well as a very small thickness of approximately 1.0 nm.
Recent experiments have reported the self-assembly of TGA- and DMAET-stabilized CdTe nanoparticles (NPs) into wires and sheets, respectively, depending upon the stabilizer used. We develop a mesoscale model based on quantum mechanical calculations and perform Monte Carlo simulations of these NPs to elucidate the condi…
We report unusual observations in the magnetic behavior of ${\mathrm{Sn}}_{1\ensuremath{-}x}\phantom{\rule{0.1em}{0ex}}^{57}\mathrm{Fe}_{x}{\mathrm{O}}_{2\ensuremath{-}\ensuremath{\delta}}$ powders prepared by a sol-gel method. M\"ossbauer spectra showed three different sites for those irons in the $\mathrm{Sn}{\mathr…
We report measurements of the spin polarization (\textbf{\textit{P}}) of the concentrated magnetic semiconductor EuS using both zero-field and Zeeman-split Andreev reflection spectroscopy (ARS) with EuS/Al planar junctions. The zero-field ARS spectra are well described by the modified (spin-polarized) BTK model with e…
We predict properties of triplet excited states in single-walled carbon nanotubes (CNTs) using a time-dependent density-functional theory (TD-DFT). We show that the lowest triplet state energy in CNTs to be about 0.2-0.3 eV lower than the lowest singlet state energies. Like in pi-conjugated polymers, the lowest CNT tr…