Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStrong Reduction of Thermal Conductivity in Nanostructured PbTe Prepared by Matrix EncapsulationJoseph R. Sootsman, Robert J. Pcionek, Huijun Kong, Ctirad Uher, and Mercouri G. KanatzidisView Author Information Department of Chemistry, Michigan State University, East L…
Here, we report a highly efficient growth of single-walled carbon nanotubes (SWNTs) and double-walled carbon nanotubes (DWNTs) on conducting metal foils. We found that foils made of Ni-based alloys with Cr or Fe serve as excellent substrates for SWNT (DWNT) synthesis. In significant contrast, a CNT grown on Ni, Fe foi…
High-level ab initio calculations using the CASPT2 method and extensive basis sets were performed on the energy differences of the high-[(5)T(2g):t(2g) (4)e(g) (2)] and low-[(1)A(1g):t(2g) (6)] spin states of the pseudo-octahedral Fe(II) complexes [Fe(H(2)O)(6)](2+), [Fe(NH(3))(6)](2+), and [Fe(bpy)(3)](2+). The resul…
Density-functional calculations are used to study various plausible structures of the wurtzite InN $(0001)$ and $(000{\bar 1})$ surfaces. These structures include the unreconstructed surfaces, surfaces with monolayers of In or N, several possible coverages and locations of In or N adatoms and vacancies. The stable str…
We have investigated the effects of the interfacial bond arrangement on the electronic transport features of metal–nanotube–metal systems. The transport properties of finite, defect-free armchair and zigzag single-walled carbon nanotubes attached to Au(111) metallic contacts have been calculated by means of the non-eq…
The slow advance of a crack in sodo-silicate glasses was studied at nanometer scale by in situ and real time atomic force microscopy (AFM) in a well controlled atmosphere. An enhanced diffusion of sodium ions in the stress gradient field at the submicrometric vicinity of the crack tip was revealed through several effe…
Abstract The adsorption of 4‐mercaptopyridine (4‐Mpy) molecules on ZnS nanocrystals was investigated by means of Raman spectroscopy. We compared the Raman signals of 4‐Mpy molecules adsorbed on ZnS nanocrystals and Ag substrate. The differences in the adsorption of 4‐Mpy molecules on the semiconductor and the metal su…
Further utilization of chitosan nanofibrous membranes that are electrospun from chitosan solutions in trifluoroacetic acid (TFA) with or without dichloromethane (DCM) as the modifying cosolvent is limited by the loss of the fibrous structure as soon as the membranes are in contact with neutral or weak basic aqueous so…
Modeling enzyme catalysis: High-level ab initio QM/MM calculations yield activation enthalpies and free energies for chorismate mutase and para-hydroxybenzoate hydroxylase that are in excellent agreement with experimental results. Enzyme reactivity is described quantitatively by transition-state theory.
Haloacid dehalogenase (HAD)-like hydrolases are a vast superfamily of largely uncharacterized enzymes, with a few members shown to possess phosphatase, beta-phosphoglucomutase, phosphonatase, and dehalogenase activities. Using a representative set of 80 phosphorylated substrates, we characterized the substrate specifi…
Zinc oxide–soluble starch nanocomposites (nano-ZnO) synthesized using water as a solvent and soluble starch as a stabilizer is impregnated onto cotton fabrics to impart antibacterial and UV-protection functions. Nano-ZnO synthesized by reacting zinc nitrate with sodium hydroxide in the presence of soluble starch absor…
The demand for high-quality low-cost uncooled infrared (IR) photodetectors have significantly increased in recent years. In this paper, a novel concept of utilizing InAsSb as a midwave IR uncooled detector is introduced. According to the approach used in this paper, the InAsSb detection layer acts as gate over a GaAs…
Abstract The effect of gas adsorption on different carbon nanotube systems is studied using ESR spectrosocpy. One system consists of purified and unpurified single‐walled carbon nanotubes, one of unpurified multi‐walled tubes, and one of multi‐walled tubes where defects have been introduced purposefully at different l…
This paper reports that the thermo-optic coefficient (dn/dT) as well as thermal expansion coefficients (β) of DR1/PMMA polymer film are measured for both TE (transversal electric) and TM (transversal magnetic) polarizations by using an attenuated total reflection configuration at the wavelengths of 832nm. The thermo-o…
We studied the structure and the dynamics of a nanocolloidal silica gel dispersed in an organic solvent [octylcyanobiphenyl (8CB)] as a function of the silica density by x-ray intensity fluctuation spectroscopy (XIFS). The silica density of the dispersed aerosil gel samples ranged from $0.03\phantom{\rule{0.3em}{0ex}}…
Abstract We report on the synthesis of hydrogen atoms in different Si 8 O 12 R 8 cages (R = (CH 2 ) n H with n = 0–3) by both radiation chemistry and ion implantation. The efficiencies of both mechanisms have been studied quantitatively and attempts to optimise the process have been made. Spectral properties and relax…
Abstract A type of rosin imidazoline (IM) has been synthesized using rosin acid and diethylenetriamine (DETA) as raw materials. The monolayers of IM were assembled on the surface of iron. The monolayers of the IM inhibitor were characterized by electrochemical impedance spectroscopy (EIS), electrochemical polarization…
[reaction: see text] The photochromic performance of a hybrid system connecting naphthopyran and dithienylethene was investigated, and the photochemistry of eight different isomers was explored by choosing an appropriate wavelength of light.
Polymer membranes were used as biomimetic environments to study the effect of confinement on silica formation. Within membrane pores, silica tubes were formed, consisting of a dense silica shell incorporating nanoparticle aggregates. The shell structure does not depend on the membrane pore size, suggesting that its fo…
Abstract Studies on the formation of single‐walled carbon nanotubes by an aerosol method based on the introduction of pre‐formed catalyst particles into conditions leading to carbon nanotube synthesis are presented. Carbon monoxide and iron nanoparticles were used as carbon source and catalyst, respectively. The carbo…