Materials Literature
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The high-bias electrical transport properties of suspended metallic single-walled carbon nanotubes (SWNTs) are investigated at various temperatures in vacuum, in various gases, and when coated with molecular solids. It is revealed that nonequilibrium optical phonon effects in suspended nanotubes decrease as the ambien…
The synthesis of porphyrin precursors requires the successive introduction of substituents at the pyrrole alpha- and alpha'-positions (2- and 5-, respectively). An alpha-pyrrole substituent that serves as a temporary masking agent and is not deactivating would greatly facilitate such syntheses, particularly for beta-(…
Ti-MCM-41 mesoporous molecular sieves were prepared at ambient temperature and were characterized by X-ray absorption near-edge structure and extended X-ray absorption fine structure, UV-vis, Fourier transform infrared spectroscopy, and photoluminescence spectroscopic analyses. It was found that an increase in the Ti…
Derivatization of silicon surfaces is an area of intense interest due to the centrality of silicon in the microelectronics industry and because of potential promise for a myriad of other applications. In this paper, we investigate the feasibility of Si-Si bond formation directly on the surface to contrast with the mor…
Biobased neat unsaturated polyester materials containing epoxidized methyl linseedate (EML) were processed with cobalt naphthenate as a promoter and 2-butanone peroxide as an initiator. Up to 25 wt % of the unsaturated polyester resin (UPE) was replaced by EML to process biobased UPE. The combination of UPE and EML re…
The selective adsorption of heavy isotopes in narrow nanotubes, known as quantum sieving, is studied using a simple approximate theory for several different potential models. We address the reasons for wide disagreement among previously published results for quantum sieving. We analyze the sensitivity of quantum sievi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTElectrically Conductive Epoxy/Clay/Vapor Grown Carbon Fiber HybridsMasaya Kotaki, Ke Wang, Mei Ling Toh, Ling Chen, Siew Yee Wong, and Chaobin HeView Author Information Institute of Materials Research and Engineering, 3 Research Lin…
Systematic studies on symmetric twin molecules composed of two bent-core mesogenic units are reported for the first time. It is shown that the formation of mesophases mainly depends on the chemical structure of the spacer. A sufficiently flexible spacer containing dimethylsiloxane units allows a decoupling of the meso…
Praseodymium hydroxide nanorods were synthesized by a two-step approach: First, metallic praseodymium was used to form praseodymium chloride, which reacted subsequently with KOH solution to produce praseodymium hydroxide. In the second step the hydroxide was treated with a concentrated alkaline solution at 180 degrees…
The Brust synthesis of thiolate-protected gold clusters has been modified to produce identifiable proportions of a hexanethiolate-protected Au225 core nanoparticle that display quantized double layer charging voltammetry consistent with a Au225 core dimension. Transmission electron microscopy (TEM) and thermogravimetr…
The occurrence of polymer−solvent intercalates of syndiotactic polystyrene (sPS) in biphenyl, benzophenone, and diphenylmethane has been observed from thermodynamic, structural, and morphological investigations. For each system the temperature−concentration phase diagram has been established by DSC and has allowed one…
We have synthesized heterostructured zinc oxide-aluminosilicate nanohybrids through a hydrothermal reaction between the colloidal suspension of exfoliated montmorillonite nanosheets and the sol solution of zinc acetate. According to X-ray diffraction, N2 adsorption-desorption isotherm, and field emission-scanning elec…
Three novel organic−inorganic hybrid monovacant Keggin-type silicotungstates and germanotungstates containing lanthanide III cations with 1D and 2D infinitely extended structures, [Sm(H 2 O) 6 ] 0.25 [Sm(H 2 O) 5 ] 0.25 H 0.5 {Sm(H 2 O) 7 [Sm(H 2 O) 2 (DMSO)(α-SiW 11 O 39 )]}·4.5H 2 O (DMSO = dimethyl sulfoxide) ( 1 )…
Photoresponsive uniform colloidal spheres were constructed from an amphiphilic azobenzene-containing random copolymer, poly{2-[4-(phenylazo)phenoxy]ethyl acrylate- co -acrylic acid} (PPAPE), and were characterized by using TEM, SEM, AFM, SLS, and DLS measurements. The photoisomerization of the azobenzene units was stu…
Due to the simplicity of the process, holes in the graphene walls of single-wall carbon nanotubes (SWNTs) and single-wall carbon nanohorns (SWNHs) have often been opened using O2 gas at high temperatures, even though this contaminates the nanotubes with carbonaceous dust (C-dust). To open holes with less C-dust contam…
The synthesis of homoditopic heterocomplementary monomers forming sextuple hydrogen-bond-mediated self-assemblies in apolar solvents is described. The nanostructures of the fibrillar aggregates formed in decane solutions of such monomers were investigated by small-angle neutron scattering. The fibers were found to be…
Carbon nanotube field-effect transistors operate over a wide range of electron or hole density, controlled by the gate voltage. Here we calculate the mobility in semiconducting nanotubes as a function of carrier density and electric field, for different tube diameters and temperatures. The low-field mobility is a nonm…
A pressure-driven method was employed to immobilize enzymes on hydrophobic mesoporous silica supports. This approach gave rise to higher enzyme loading and reduced enzyme leaching, compared to conventional methods. Candida antarctica lipase B (CALB) was successfully entrapped in the cagelike pores of siliceous mesocel…
A rapid new method for preparation of monodisperse InP-nanocrystals was developed. A highly reactive indium precursor and tris(trimethylsilyl)phosphine (TMS)3P was reacted within a weakly coordinating solvent in the presence of a supporting protic agent. The yielded InP-nanocrystals had a very narrow size distribution…
This paper reports well-aligned arrays of CuO nanoplatelets synthesized through a hydrothermal route without template's assistance. The surface of well-aligned arrays of CuO nanoplatelets looks like a wall. These nanoplatelets, possessing four clear edges, are 50-80 nm in thickness, 150-250 nm in width, and 0.8-1.5 mi…