Materials Literature
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We report solvatochromatic shifts in the absorption spectra of colloidal CdSe quantum dots that are consistent with the change in polarization energy of the quantum-confined exciton. Good agreement with theory is found when the screening from the ligand shell is included. The polarization energy also accounts for the…
We present a detailed magnetic study of the perovskite manganite ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ at low temperatures including magnetization and ac susceptibility measurements. The data appear to exclude a conventional spin glass phase at low fields, suggesting instead the presence of correl…
We consider a porous medium being saturated with a pore fluid (Biot's theory). The fluid is assumed as incompressible. It is shown that the general integral of the elastic and pressure equations can be written in form of a time dependent vectorpotential ${\bf F}$ being a solution of a homogeneous, fourth order differe…
One of the expectations in science is the discovery of materials with surprising properties or functionality based on designed molecules that self-order or fold. The focus on self-assembly throughout the 90s has generated very useful knowledge toward this expectation and many prospects are on the horizon.1-6 Learning…
Ab initio molecular orbital theory was used to examine the physisorption of a hydrogen molecule on planar and curved graphene clusters. The repulsive nature of a H 2 −H 2 interaction and the small dependence of physisorption energies on physisorption sites favor a close-packed structure for molecular hydrogen physisor…
The properties of diluted ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ are calculated for a wide range of Mn concentrations within the local-spin-density approximation of density-functional theory. M\"ulliken population analyses and orbital-resolved densities of states show that the configuration of…
Abstract A series of novel thermotropic main‐chain chiral liquid–crystalline random copolyesters consisting of spacers of two different types—chiral and achiral—was synthesized. Polyesters (BmTa) with tartaric acid as the chiral spacer (Ta), aliphatic diols (with ‘ m ’ = 2–10 methylene groups) as the achiral spacers,…
Multiple internal reflection infrared spectroscopy (MIRIRS) and temperature-programmed desorption (TPD) were used to investigate the interaction of oxygen with a diamond (110)-oriented surface. Exposure of the hydrogen-free diamond surface at 90 K to room-temperature O 2 or thermally excited oxygen, O 2 * (produced wi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT[Co(en)3][B2P3O11(OH)2]: A Novel Borophosphate Templated by a Transition-Metal ComplexGuo-Yu Yang and Slavi C. SevovView Author Information Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556 Cite this: Inorg. Chem. 2001, 40, 1…
A new type of TiO 2 nanosheet−organic complex multilayer film was successfully prepared by the Langmuir−Blodgett technique. Surface pressure−area ( π − A ) curves demonstrated that a stable monolayer of dioctadecyldimethylammonium bromide (DODAB) was formed on an aqueous suspension of TiO 2 nanosheets derived from an…
Edman degradation remains the primary method for determining the sequence of proteins. In this study, accelerator mass spectrometry was used to determine the N-terminal sequence of glutathione S-transferase at the attomole level with zeptomole precision using a tracer of (14)C. The transgenic transferase was labeled b…
Solutions of xanthan gum form a strong gel in the presence of metal ions. The gelation process of a low concentration xanthan solution in the presence of aqueous aluminum ions (Al(III)) was followed as a function of temperature. Thermal gelation was observed at 44 ± 2 °C by the onset of heterodyne and nonergodic behav…
The synthesis and electrochemical and spectroscopic properties of bis-dirhodium complexes containing ap or dpf bridging ligands, (ap)(4)Rh(2)(C triple bond C)(2)Rh(2)(ap)(4) (2) and (dpf)(4)Rh(2)(CNC(6)H(4)NC)Rh(2)(dpf)(4) (4), were investigated (where ap and dpf are the 2-anilinopyridinate and N,N'-diphenylformamidin…
The interfacial interaction between PAN-based IM7 carbon fibers and Avimid K3B, a thermoplastic polyimide resin was investigated using core and valence band X-ray photoelectron spectroscopy (XPS). The extent of interaction between the fiber and the matrix material has a significant effect on the strength of the ultima…
Polymeric [CuII(SQMe−SQMe)]n has been prepared with a bridging 4,4‘-bis(semiquinone) ligand. Temperature-dependent magnetic properties result from ferromagnetic and antiferromagnetic coupling interactions involving the metal and the diradical ligands. Monomeric (bpy)CuII(CatMe−BQMe) and (PPh3)2CuI(SQMe−BQMe) show that…
This study demonstrates for the first time that porous zeolite films with surface patterns such as knotted-rope web and wrinkled honeycomb can be obtained by convection-assisted dynamic self-assembly of zeolite nanoparticles. The study also shows that an appropriate dispersant and the presence of zeolite nanoparticles…
Carbonaceous compounds deposited on aluminosilicate mesoporous molecular sieves of the MCM-41 type during conversion of cyclohexene at various temperatures were investigated using TGA; DRIFT, UV−vis, and 13 C solid state NMR spectroscopies; and a sorption technique. The chemical composition of the deposits is not sign…
The effectiveness of power ultrasound as a viable alternative for destroying pathogenic organisms in homogeneous and heterogeneous mixtures of aqueous solutions was investigated. The method involved monitoring of total coliform bacteria during sonication of E. coli suspensions in the absence and presence of equivalent…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
${\mathrm{C}}_{20}$ cages consisting only of pentagons have been synthesized in a gas phase. [H. Prinzbach et al., Nature (London), 407, 60 (2000)]. By performing first-principles calculations, we have found that the ${\mathrm{C}}_{20}$ cages can form condensed phases in several dimensions. The most stable phase among…