Materials Literature
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Abstract Hydrogenation of carboxylic styrene–butadiene rubber latex was carried out using hydrazine and hydrogen peroxide with ferrous sulfate as a catalyst without pressurized hydrogen and an organic solvent. A mixed inhibitor was used during hydrogenation to prevent gel formation. Various hydrogenation conditions we…
Abstract Self‐assembled films of poly( o ‐ethoxyaniline)—POEA alternated with sulfonated lignin (SL)—were successfully produced, and their kinetics of formation and growth investigated for different dopants (hydrochloric acid, methanesulfonic acid, p ‐toluenesulfonic acid, and camphorsulfonic acid). These films were c…
Blends of polystyrene (PS) and polyurethane (PU) elastomer were obtained by melt mixing, using poly(styrene-co-maleic anhydride) (SMA) containing 7 wt % of maleic anhydride groups as a reactive compatibilizer. Polyurethanes containing polyester flexible segments, PU-es, and polyether flexible segments, PU-et, were use…
The morphology of silk produced by recluse spiders (Loxosceles arizonica) was investigated by scanning electron microscopy, atomic force microscopy, and transmission electron microscopy. This silk consisted entirely of very long, thin ribbons of width 2-4 microm and thicknesses of no more than 40 nm. The correspondenc…
Abstract Poly(trimethylene terephthalate) (PTT)‐based mono and bico meltblown webs have been produced by using a Reicofil® Bi‐Component Meltblown Line at TANDEC, located at the University of Tennessee, Knoxville, TN. Thermal and flow properties of PTT were first examined by DSC (differential scanning calorimetry) and…
In the field of the science of flow and deformation of matter (rheology), the so-called Deborah number plays an important role, since it describes the influence of time on the observed flow properties. The technique of thermally stimulated depolarisation currents (TSDC) constitutes a dielectric technique whose experim…
We describe a novel method to control the shape and size of Au nanoparticles using a protection–reduction technique. The remarkable feature of this method is that the reducing and protecting agents were mixed first prior to addition to the solution of KAu(CN)2.The reactivity and concentration of reducing agent, the mo…
In this paper, the experimental results of the study of the behaviour of three-layer solid dielectrics in high electric field are presented. The breakdown voltage and the breakdown channel forms depend on factors such as the position of the boundaries between layers in the gap, the ratio of permittivities of layer mat…
We have measured the thermal conductivity of glassy glycerol between 1.5 and 100 K, as well as the specific heat of both glassy and crystalline phases of glycerol between 0.5 and 25 K. We discuss both low-temperature properties of this typical molecular glass in terms of the soft-potential model. Our finding of an exc…
New layered inorganic−organic magnesium organosilicates were prepared by a single-step template sol−gel synthesis through the reaction of magnesium ions with a synthetic homologous series of urea−alkoxysilanes with the general formula (CH 3 CH 2 O) 3 Si(CH 2 ) 3 NHC(O)NH(CH 2 ) n CH 3, for n = 2, 4, and 6. The nanocom…
A hydrophobic core is a widely accepted determinant of protein stability. However, regulatory proteins undergoing ligand-induced conformational switching may expose interior residues to solvent and cannot afford to be extremely rigid. Optimizing the energetic balance between stability and binding is challenging. The a…
Resonant Raman scattering and photoluminescence from high-quality nanocrystalline ZnO thin films prepared by thermal oxidation of ZnS thin films, X T Zhang, Y C Liu, Z Z Zhi, J Y Zhang, Y M Lu, D Z Shen, W Xu, G Z Zhong, X W Fan, X G Kong
The therapeutic effectiveness of drugs is often limited by the inability to sustain therapeutic levels at the target site. Encapsulation of drugs in multivesicular lipid-based particles for sustained release is a novel approach to improving the pharmacokinetics of drug therapy. This paper reviews the preclinical and c…
The synthesis, structures and magnetic properties of two fluorine-intercalated layered manganates, LaSrMnO4F and La1.2Sr1.8Mn2O7F, are reported. Rietveld structure refinement based on time of flight neutron powder diffraction data indicates that both compounds are tetragonal (space group P4/nmm) with cell parameters a…
Two- and three-dimensional superlattices of passivated silver nanoparticles were formed on amorphous carbon films by the self-assembly technique. The x-ray diffraction (XRD) and x-ray photoelectron spectroscopy results demonstrated that the colloid system was composed of silver nanoparticles and, on the surface of the…
Abstract There are two types of polycondensation reactions in the solid‐state polymerization (SSP) of poly(ethylene terephthalate) (PET), namely, transesterification and esterification. Transesterification is the reaction between two hydroxyl ends with ethylene glycol as the byproduct, and esterification is the reacti…
Lithium magnesium fluoride sulfate, LiMgFSO4, has been prepared by reaction of MgSO4·H2O, Li2CO3 and NH4F at 450–500 °C. It crystallizes in space group P of the triclinic system, with Z = 2 and a = 5.1623(7), b = 5.388(1), c = 7.073(1) Å, α = 106.68(1), β = 107.40(1) and γ = 97.50(1)°. The structure is built up from s…
In this paper, a porous silicon (PS) layer is investigated as a sensing material to detect organic vapours with low concentration. To do this, PS sensors with membrane structure were designed and fabricated. The sensors were made by applying the technologies of membrane formation by anisotropic etching of silicon and…
With the miniaturization of a solid, quantum and interface effects become increasingly important. As a result, the band structure of a nanometric semiconductor changes: the band gap expands, the core level shifts, the bandwidth revises, and the sublevel separation within a band increases. Unfortunately, such a thoroug…
A novel approach to design extremely low band gap polysquaraines with intense near-infrared (NIR) absorption and high intrinsic conductivity is described. Feasibility of the new strategy is illustrated by an A-B type copolymerization of squaric acid and 1,4-dialkoxydivinylbenzene-bridged bispyrroles, which resulted in…