Materials Literature
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Control of the electrical and optical properties of different polythiophene derivatives can be achieved, to some extent, by adjusting the nature of their substituents. The effects of flexible side chains (increase in solubility, modification of the stability of the conducting state, induction of thermo‐, iono‐, photo‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphogenesis of Biomineral and Morphosynthesis of Biomimetic FormsGeoffrey A. OzinView Author Information Materials Chemistry Research Group, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6 Cite this: Acc. Chem. Res. 19…
Some Acetobacter strains produce a cellulose called bacterial cellulose in culture medium. This cellulose has unique structural and mechanical properties compared with higher plant cellulose, and is expected to be a commodity material in various fields of industry. For economical mass production, it is essential to co…
The rational modification of porous and single‐crystalline silico surfaces is of particular interest for technologies based on silicon. Porous silicon, such as the layer shown in the Figure, has many potential technological applications. In this review of chemical reactions developed for Si surface modification, both…
We evaluate thermodynamic, structural, and transport properties from extensive molecular-dynamics computer simulations of the ST2 and TIP4P models of liquid water over a wide range of thermodynamic states. We find a line in the phase diagram along which the isothermal compressibility of the supercooled liquid is a max…
Self-assembly of silver sulfide, Ag 2 S, nanoparticles is reported for different particles sizes. Monolayers of particles organized in a hexagonal network are formed over very large domains. Small or large aggregates can also be produced. The observations indicate that the formation of self-assemblies of nanoparticles…
Metallophthalocyanine thin films, obtained by vacuum deposition as highly ordered, uniquely oriented films (the Figure shows an iron phthalocyanine film deposited at 200°C), have been sued to fabricated organic field‐effect transistors (FETs). It is demonstrated that the substrate temperature during deposition greatly…
Negatively charged amino acids (aspartic acid, glutamic acid) and a related polymer, poly(α,β-aspartate), have been intercalated within the gallery spaces of layered double hydroxides. Synthesis of these bioinorganic nanocomposites was achieved via co-precipitation involving simultaneous formation of the inorganic lay…
Temperature-dependent neutron diffraction studies on melt-grown crystals of the layered compound ${\mathrm{La}}_{1.2}$${\mathrm{Sr}}_{1.8}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ reveal a dramatic structural response to the onset of ferromagnetism and the coincident insulator-metal transition. Unlike the related mangani…
The measurement of current and voltage fluctuations on the same electrochemical cell allows the evaluation of a quantity R n known as noise resistance, which has been proposed as an indication of the corrosion resistance of the material under study. The theoretical basis for the relationship between R n and the electr…
Silicon is at the heart of the microelectronics revolution. Its dominance over other semiconductors is intimately tied to its superior materials and processing properties and to the tremendous base of technology that has developed around it. Another semiconductor is not likely to displace silicon as the material of ch…
Ordered organo–silica–surfactant mesophases containing covalently linked functionalized moieties are prepared with MCM-41-type architectures by template-directed co-condensation of tetraethoxysilane and organotrialkoxysilanes (RO) 3 Si–R′ [R = Me, Et; R′ = (CH 2 ) 3 SH, (CH 2 ) 3 NH 2 , (CH 2 ) 3 OCH 2 CH(O)CH 2 , (CH…
XAFS, IR, and UV−vis (diffuse reflectance and photoluminescence) spectroscopies have been employed to investigate the local environment of Cu I in Cu I -ZSM-5 prepared by gas phase reaction of H-ZSM-5 (SiO 2 /Al 2 O 3 = 90−50) with CuCl. The measurements confirm that the absolutely predominant copper species formed wi…
False-twist-textured yarns of 22 dtex and below with few filaments are commonly used in stretch stockings and tights. Because of the relatively high ratio of filament diameter to yarn diameter in such yarns, a concentric-helix model cannot be assumed, and the geometrical relationships describing their structure have t…
Sudden rearrangement of the tightly packed bubbles in a foam can be induced by application of shear and by diffusion of gas from smaller to larger bubbles. Using diffusing-wave spectroscopy, we measure dynamics at times that are short in comparison with the rate of these events, where the relative bubble configuration…
Electrochromic properties of poly(aniline N‐butylsulfonate)s (PANBUS) coatings on indium‐tin oxide (ITO) glasses exposed to an ion conducting polymer films were investigated. The ion conducting polymer films were prepared via photocross‐linking reactions of methoxy polyethylene glycol‐mono methacrylate with tri(propyl…
The solution of the nonlinear equation for a typical ferroresonant circuit containing a power transformer is shown to be dependent on the value of its initial conditions. It is also shown that a small change in initial conditions leads to a large difference in long-term behaviour of the system, and this makes the futu…
Fabrics woven from ring-, rotor-, and friction-spun yarns, have been compared from the standpoint of comfort. Emphasis has been placed on the tactile and thermal aspects of comfort by the use of the Kawabata Fabric Evaluation System. The effect of the weave on the comfort aspects of the fabric has also been studied. A…
The effect of tramp elements Cu and Sn on the hot workability of mild steels was investigated in this paper. A hot rolling condition was simulated by oxidizing followed by tensile-deforming and the hot workability was assessed by measuring the number of surface cracks. The microstructure at the scale/steel interface w…
Low-grade exhaust heat is used to provide a reliable and independent power source for instrumentation circuitry by means of a thermoelectric generator (TEG). A design of a self-starting DC-DC power converter is developed and optimized for very-low-input voltages (below 300 mV) in order to allow operation at temperatur…