Materials Literature
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Abstract Carbon nanotubes can be made soluble in both organic solvents and in aqueous solutions by organic functionalization. In particular, soluble carbon nanotubes can be further derivatized by coupling with amino acids and bioactive peptides. Immobilization of peptides to the external walls of carbon nanotubes may…
New NMR experiments are presented for the assignment of methyl (13)C and (1)H chemical shifts from Ile, Leu, and Val residues in high molecular weight proteins. The first class of pulse schemes transfers magnetization from the methyl group to the backbone amide spins for detection, while the second more sensitive clas…
3D PbS dendritic nanostructures (see Figure) have been fabricated by a facile hydrothermal method in the presence of N ‐cetyl‐ N , N , N ‐trimethyl‐ammonium bromide (CTAB). Both CTAB and thiourea play important roles in the formation of well‐defined PbS dendrites. X‐ray diffraction, electron diffraction, and high‐reso…
Synthesis of water‐soluble CdTe nanocrystals with high photoluminescence quantum yield and narrow fluorescence emission spectra (see Figure) is developed under the conditions of low precursor concentration and moderate temperature of hydrothermal growth. The relatively high temperature accelerates the particle growth…
Compressed under ambient temperature, graphite undergoes a transition at approximately 17 gigapascals. The near K-edge spectroscopy of carbon using synchrotron x-ray inelastic scattering reveals that half of the pi-bonds between graphite layers convert to sigma-bonds, whereas the other half remain as pi-bonds in the h…
The basic concepts and characteristics of Raman spectra from carbon nanotubes (both isolated and bundled) are presented. The general characteristics of the radial breathing mode, tangential mode (G band), disorder-induced mode (D-band) and other Raman features are presented, with the focus directed toward their use fo…
Semiconductor quantum dots (QDs) are nanometer-sized fluorescent probes suitable for advanced biological imaging. We used QDs to track individual glycine receptors (GlyRs) and analyze their lateral dynamics in the neuronal membrane of living cells for periods ranging from milliseconds to minutes. We characterized mult…
We present a simple and intuitive picture, an electromagnetic analog of molecular orbital theory, that describes the plasmon response of complex nanostructures of arbitrary shape. Our model can be understood as the interaction or "hybridization" of elementary plasmons supported by nanostructures of elementary geometri…
Previously we reported stretched polyaniline films as thermoelectric materials. The conductive polyaniline films were cast and stretched to investigate on thermoelectric properties. The thermoelectric performance of the stretched polyaniline films in the direction parallel to the stretching direction was much higher t…
(Bi/sub x/Sb/sub 1-x/)/sub 2/Te/sub 3/ (.5/spl les/x/spl les/.7) polycrystalline samples were synthesized using a combination of melting and powder metallurgy techniques. The samples were hot pressed in graphite dies and cut perpendicular and parallel to the pressing direction. Samples were examined by microprobe anal…
Abstract The Hartree–Fock–Bogoliubov (HFB) method, dealing with Bogoliubov orbitals, which consist of particle and hole part, can provide states with pair correlations associated with Cooper pairs. The dimension of HFB Fock matrices can be reduced by restrictions of spin states of Bogoliubov orbitals similarly to ordi…
Thermoelectrics have application for cooling, heating and temperature control in vehicles including cars, trucks and vans. The first automobile application has successfully entered mass production. Interest is increasing in establishing other uses for thermoelectrics in vehicles. Characteristics and performance requir…
Changes in supramolecular assembly of matrix, specifically collagen, have important functional consequences, especially for tissues requiring high mechanical strength. Thus modulation of collagen assembly could be used as a therapeutic intervention or to control the development of tissue-engineered constructs containi…
The US Department of Energy's National Renewable Energy Laboratory (NREL) has developed an integrated heat exchanger/thermoelectric power system analysis tool (in Matlab/Simulink environment) that simultaneously analyzes and optimizes the integrated effects of heat exchanger and thermoelectric power generator (TEPG) p…
A unique structure: In the crystalline state the lanthanum copper sulfide La2CuS4 comprises discrete anion triples. These are composed of almost planar triangular [CuS3]5− units, which consist of Cu+ and S2− ions linked through a −SS−-dumbbell to form the [S3Cu⋅⋅⋅SS⋅⋅⋅CuS3]12− anion (see picture).
We study the emergence of a cross-over from entropically driven to thermally activated dynamics in different versions of the 'entropic' phase space model introduced by Barrat and Mézard, and previously considered in the zero temperature limit. We first focus on the low temperature ( T ⩽ T g ) ageing phase of the origi…
The dynamics of E92B18 (E=OCH2CH2: oxyethylene, B=OCH2CH(C2H5): oxybutylene; the subscripts are the number of repeats) block copolymer micelles is investigated by neutron spin-echo (NSE). The dynamics of chains in E92B18 micelles is investigated in the hard gel and soft gel phases of the E92B18 in D2O, as well as in t…
We have measured the thermoelectric power of several germanium single crystals with different isotopic compositions: natural, 96.3%, and 99.99% enriched ${}^{70}\mathrm{Ge}.$ N- and p-type Ge samples with the net concentration of electrically active impurities $<2\ifmmode\times\else\texttimes\fi{}{10}^{13}{\mathrm{…
The metal-insulator transition in VO2 was investigated using the three-band Hubbard model, in which the degeneracy of the 3d orbitals, the on-site Coulomb and exchange interactions, and the effects of lattice distortion were considered. A new scenario on the phase transition is proposed, where the increase in energy l…
The conventional worldwide accepted method of computerized glow curve deconvolution based on the general order kinetics formalism has two fatal defects in systems where the trapping levels (two or more) have non-zero retrapping probability. The first one is ignoring the thermal connectivity between thermoluminescence…