Materials Literature
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The method of thin film preparation known as layer-by-layer assembly is of growing interest for current and envisioned developments in bionanotechnology. Here, cysteine-containing 32mer peptides have been designed, synthesized, purified, and used to prepare polypeptide films. A range of methods-quartz crystal microbal…
Self-organized Si-Er heterostructure nanowires showed promising 1.54 microm Er(3+) optical activity. Si nanowires of about 120-nm diameter were grown vertically on Si substrates by the vapor-liquid-solid mechanism in an Si-Er-Cl-H(2) system using an Au catalyst. Meanwhile, a single-crystalline Er(2)Si(2)O(7) shell san…
This paper describes the photosynthesis of gold nanoparticles (GNPs) in the presence of bovine serum albumin (BSA). The concentration of NaAuCl4 and the relative ratio of NaAuCl4 to BSA are important parameters for controlling the size of the GNPs. We prepared GNPs having average diameters ranging from 7 to 50 nm by i…
The phase composition and morphology of black powder samples synthesized by pyrogenation of carbon nanotubes and colloidal Fe(OH) 3 were investigated using x-ray diffraction (XRD) and transmission electron microscopy. A new kind allotrope of carbon, 'new diamond' (n-diamond), was obtained in the final black powder whe…
Thermally induced transmission and reflectivity changes are investigated in thin films formed by Bi nanostructures embedded in amorphous Al 2O3. The Bi nanostructures are formed by coalesced nanoparticles forming a quasi-network close to the percolation threshold. Upon heating above the Bi melting temperature (>574…
This paper deals with the investigations on the nucleation and growth of Zinc Oxide (ZnO) nanostructures in a catalyst free synthesis. The ZnO nanostructures have been formed by evaporation of Zn (99.99%) in O2 and Ar atmosphere in single zone furnace under two temperature regions, region A (approximately 1173-1073 K)…
Abstract The effects of molecular weight (MW) and MW distribution on the maximum tensile properties of polyethylene (PE), achieved by the uniaxial drawing of solution‐grown crystal (SGC) mats, were studied. The linear‐PE samples used had wide ranges of weight‐average ( M w = 1.5–65 × 10 5 ) and number‐average MWs ( M…
The development of the ferroelectric polarization of lead–zirconate–titanate (PZT) bulk ceramics under varying electric fields is examined. Repeated partial switching and backswitching results in a decrease of the switchable polarization, but has no effect on the effective strain. This is attributed to a stabilization…
Abstract Acrylic polymer/silica hybrids were prepared by emulsifier‐free emulsion polymerization and the sol–gel process. Acrylic polymer emulsions containing triethoxysilyl groups were synthesized by emulsifier‐free batch emulsion polymerization. The acrylic polymer/silica hybrid films prepared from the acrylic polym…
We observed thermally induced nanomechanical deflection of a hybrid inorganic nanowire (NW) synthesized by pulsed-laser deposition, the structure of which is a carbon nanotube template sandwiched by aluminum oxide and tungsten oxide thin layers. The hybrid NW was gradually bent at a specimen temperature ranging from r…
Microwave absorption (8 GHz to 12 GHz) studies have been made with carbon nanomaterials for the first time. Carbon nanomaterials are synthesized by the pyrolysis of camphor. It is observed that film of carbon prepared under certain synthetic condition, can absorb microwave of either some specific wavelengths e.g., 9.5…
The alkylation of m-cresol with isopropyl alcohol in the presence of novel superacidic catalysts named as UDCaT-4, UDCaT-5, and UDCaT-6 was investigated. The catalysts are modified versions of zirconia showing high catalytic activity, stability, and reusability in the presence of water as compared to conventional sulf…
Light-induced ordering processes were investigated in spin-coated films of a smectic main-chain polyester with mesogenic 4,4‘-dioxyazobenzene groups in the backbone. Spin-coating results in aggregation due to π−π stacking and out-of-plane orientation. Both are destroyed by UV exposure. However, they are rebuilt by sub…
The microwave (mw) plasma torch at atmospheric pressure has been studied for carbon nanotube (CNT) synthesis. The depositions were carried out on silicon substrates with 515 nm thin iron catalytic overlayers from the mixture of argon, hydrogen and methane. The optical emission spectroscopy of the torch showed the pres…
Absorption, fluorescence and decay properties of erbium-doped alkali tellurofluorophosphate glasses (RTFP) with the molar compositions of 50 (NaPO 3 ) 6 –10 TeO 2 –20 AlF 3 –19 RF–1 Er 2 O 3 (R = Li,Na or K) have been investigated in order to utilize these materials for the development of fibre amplifiers and lasers.…
This letter reports the formation of a reacted layer between Cu film and barrierless Si substrate during annealing. The Cu films with a minor WN phase are deposited by reactive cosputtering of Cu and W in an Ar∕N2 mixture gas. After annealing at 530 °C for 1 h, a ∼200-nm-thick reacted layer formed at the Cu(WN)∕Si int…
Powder x-ray diffraction patterns of magnetite (Fe 3 O 4 ) have been recorded at 90 K, below the Verwey transition, at three wavelengths in the pre- to mid-edge region of the 7.1 keV Fe K absorption. Simultaneous fitting of these profiles has been used to refine the anomalous scattering coefficients for the octahedral…
Porous anodic alumina membranes (PAAMs) have uniform and high-density nanopores, and the dimension and interval of the pores can be easily controlled by varying the anodization conditions. The application of PAAMs could widely impact the cost and efficiency of the liquid-based nanoscale separations. We report here the…
Ba(dmae)2 (dmaeH=N,N-dimethylaminoethanol, C4H11NO) reacts with Co(acac)2 (acac=2,4-pentanedionate) to produce the trinuclear coordination complex [Ba2Co(acac)4(dmae)3(dmaeH)] in an 85% yield. Spectroscopic and single-crystal X-ray diffraction experiments indicate that the complex possesses a structure in which two ba…
Abstract The treatment of nanoscopic silica grafted in the blend during the processing of silica‐filled styrene butadiene rubber was performed with silane, introduced at different concentrations, or at a constant concentration with a given length of alkyl chain. From swelling measurements in water and in solvent, the…