Materials Literature
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Unsymmetric peptide bolaamphiphiles that incorporate (l-glutamyl)3glycine at one terminus and either tetraethylene glycol or aspartic acid at the other were found to form hydrogels at low wt %, presumably by self-assembling into nanofibers presenting (l-glutamyl)3glycine at their surfaces and burying the second headgr…
A series of block copolymers were synthesized by ring-opening polymerization of l ( d )-lactide in the presence of mono- or dihydroxyl poly(ethylene glycol) (PEG) using zinc metal as a catalyst. The resulting diblock and triblock copolymers with relatively short polylactide (PLA) blocks were characterized by various a…
Deposition of stable boron-doped diamond (BDD) films on Ti substrates is believed to be very difficult. In the present study, the stability of Ti/BDD electrodes has been significantly improved by using an organic additive, CH2(OCH3)2. The improved electrodes had service lives of 175-264 h under accelerated life test c…
SWNTs, produced via the HiPco process, display strong microwave absorption (1.01 × 10-5 eV microwave field) with subsequent dramatic light emission, intense heat release (2000 °C), outgassing, mechanical extension, and nanotube reconstruction (welding and loop formation).
Asymmetric dimers consisting of gold microcrystals and spherical silica colloids have been fabricated by depositing thin films of gold onto the spherical colloids to form half-shells, followed by annealing at elevated temperatures. The capability and feasibility of this procedure have been demonstrated with silica and…
Mercaptopropyl-functionalized silica spheres have been prepared by self-assembly co-condensation of mercaptopropyltrimethoxysilane (MPTMS) and tetraethoxysilane (TEOS) precursors in the presence of a cationic surfactant as templating agent and ammonia as catalyst. Several materials have been obtained by varying the MP…
The fabrication of functional nanostructured materials for sensing, encapsulation and delivery requires practical approaches to self-assembly on multiple length scales and the synthesis of tough yet permeable structures. Here, the self-assembly of functionalized, photoluminescent nanoparticles at liquid interfaces, fo…
In the present work we report results from neutron and synchrotron radiation diffraction measurements that confirm the presence of a very weak phase transition in Sr 2 CuWO 6 at about 600 °C. This phase transition is continuous and changes the symmetry from I 4/ m at low temperature to another tetragonal phase at high…
The surface of boron-doped diamond thin films can be modified by exposure to a strong oxidizing agent, resulting in the formation of -OH and =O terminated diamond. The -OH groups are reacted with an acid chloride to produce a covalently bound, modified diamond thin film surface. The demonstration of these reactions al…
Motivated by Lehmann-like rotation phenomena in cholesteric drops we study the transverse drift of two types of cholesteric fingers, which form rotating spirals in thin layers of cholesteric liquid crystal in an ac or dc electric field. We show that electrohydrodynamic effects induced by Carr-Helfrich charge separatio…
The band structure of surface electronic states on the $\mathrm{ZnO}(101\ifmmode\bar\else\textasciimacron\fi{}0)$ surface has been investigated by angle-resolved photoelectron spectroscopy utilizing synchrotron radiation. Photon-energy dependent measurement and the K and ${\mathrm{O}}_{2}$ adsorption studies have been…
Magnetic susceptibility, electron paramagnetic resonance (EPR) and optical absorption have been studied in a glass system 20La 2 O 3 –22Al 2 O 3 –23B 2 O 3 – 35(SiO 2 +GeO 2 ) with a part of La 2 O 3 substituted by Gd 2 O 3 in different concentrations. Positive Weiss constants have been found in more heavily doped gla…
The wet air oxidation kinetics of an aqueous solution of phenol was studied over extrudates of an Al−Fe pillared clay catalyst in the temperature range of 90−150 °C and air pressure range of 0.8−2.5 MPa. The variables studied included reaction temperature, air pressure, solution pH, initial phenol concentration, and c…
Abstract Radical copolymerization of behenyl (systematic IUPAC nomenclature: n ‐docosyl) acrylate and behenyl fumarate has been carried out in toluene at 70°C using benzoyl peroxide as initiator. Gel permeation chromatography was used to determine molecular weights (MW) and molecular weight distribution (MWD) of behen…
Disc shaped samples of the glass composition: 0.40Bi 2 O 3 –0.60B 2 O 3 were prepared by a melt quenching technique by keeping the quenching rate constant but gradually increasing the melt annealing or ageing time from 15 to 220 min at a temperature of 850 °C. A total of five glass samples were prepared. Density, ultr…
The ultrastructure and mineralogy of cultured and wild specimens of the green algae Acetabularia acetabulum were studied. Sites of calcification were clarified using TEM and SEM. Minerology was determined via electron diffraction, energy‐dispersive x‐ray microanalysis, and Fourier transform infrared spectral analyses…
The effect of host glass composition on the optical absorption and fluorescence spectra of Nd 3+ has been studied in mixed alkali borate glasses of the type x Na 2 O–(30− x )K 2 O–69.5B 2 O 3 –0.5Nd 2 O 3 ( x = 5, 10, 15, 20 and 25). Various spectroscopic parameters such as Racah ( E 1 , E 2 and E 3 ), spin–orbit ( ξ…
Abstract The ductile–brittle transition temperatures were determined for compatibilized nylon 6/acrylonitrile‐butadiene‐styrene (PA6/ABS) copolymer blends. The compatibilizers used for those blends were methyl methacrylate‐ co ‐maleic anhydride (MMA‐MAH) and MMA‐ co ‐glycidyl methacrylate (MMA‐GMA). The ductile–brittl…
Highly ordered ZnO crystals of 0.15 μm width and 0.5 μm length were grown on silicon wafers coated with a monolayer of SiCl 3 (CH 2 ) 11 −O−C 6 H 5 molecules. Various techniques (contact angle measurements, ellipsometry, ATR-FTIR) were employed for determining the quality of the monolayer coating. In addition, the bar…
A systematic search method that identifies trial crystal structures by manipulating a molecular model in direct-space within a defined unit cell and comparing calculated and experimental powder X-ray data and assessing calculated lattice energies has been extended to allow simulation of crystal structures having two s…