Materials Literature
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The size effects of ferroelectric particles described by the transverse Ising model have been studied taking into account the long-range interactions. The size dependence of the mean polarization, Curie temperature, and the mean susceptibility, as well as the critical size of the particle, have been obtained. The prof…
ABSTRACT In this study, attempts were made to improve the characteristics of starch‐based plastic foams by blending starch with polylactic acid (PLA), a biodegradable polymer made from renewable sources. Formulations of the foams (types of starch, ratio of starch to polymer, and moisture content) were optimized. Physi…
To use porous silicon as an optical interferometric biosensor, the pores must be sufficiently large to allow easy ingress of reagents and the layer must also display Fabry-Perot optical cavity modes. Here the detection antibody is rabbit IgG and the analyte is α-rabbit IgG conjugated to horseradish peroxidase (HRP). F…
The thermal decomposition kinetics of different polymorphs of CL-20 (α, γ and ε) has been investigated by thermogravimetry, IR spectroscopy and optical and electronic microscopy. The reactions proceed with self-acceleration and can be described by a kinetic law of first order with autocatalysis. Already at the earlies…
Chemically synthesized nanoparticles can be regarded as building blocks for more complex systems. Hence, the characterization of their attributes is a key step toward controlling and tuning the properties of new nanocomposite materials. We present a structural characterization of thiol-capped gold nanoparticles as a f…
The nucleation and crystallization of a series of glasses based on 4.5SiO 2 ·3Al 2 O 3 ·1.5P 2 O 5 ·(5 − z )CaO · z CaF 2 with a Ca:P ratio corresponding to apatite were studied. In these glasses, the objective was to investigate the influence of fluorine content and z was varied from 3 to 0. All the glasses studied c…
The heat capacity of synthetic eskolaite, Cr 2 O 3 , and of the synthetic spinels magnesiochromite, MgCr 2 O 4 , and chromite, FeCr 2 O 4 were measured from 1.5 K to 340 K. For MgCr 2 O 4 , a substantial magnetic contribution to the entropy is revealed by a sharp peak in the heat capacity curve at 12.55 ± 0.05 K, whic…
A temperature-dependent study was carried out for the platinum-nanoparticle-catalyzed electron-transfer reaction between hexacyanoferrate(III) and thiosulfate ions in the temperature range of 20−70 °C. The Pt nanoparticles are dominantly truncated octahedral in shape and have an average particle size of 7.0 ± 0.8 nm.…
Stem scar application of chitosan inhibited growth and production of pathogenic factors by blackmold rot [ Alternaria alternata (Fr.:Fr.) Keissl.] in challenged tomato ( Lycopersicon esculentum Mill.) fruit stored at 20 °C for 28 days. Blackmold lesions were visible within 4 days of inoculation in control fruit, compa…
Thermally-carbonized porous silicon films have been prepared by exploiting the dissociation of acetylene. Thermoanalytical methods have been used to study the oxidation behavior of these films in different oxidizing ambients. The results have been compared to other stabilization methods. Due to enhanced adsorption and…
The Cd 2+ -mediated assembly of multiporphyrin arrays at air−subphase interfaces has been studied. Surface pressure−area isotherms for the monolayers of zinc tetrapyridylporphyrin (ZnTPyP) showed that the mean ZnTPyP molecular area was 0.65 and 1.9 nm 2 on water and 0.1 M Cd 2+ subphase surfaces, respectively. Spectro…
A mathematical model for prediction of the compressional behaviour of woven reinforcement is described. The model accounts for the compression of yarns and the change of yarn crimp under pressure applied to a fabric layer. Compression curves of glass rovings are studied experimentally and serve as input for simulation…
We investigated the effect of A-site compound substitution on the structures and properties of Ca 0.8 (MCe) 0.1 Bi 4 Ti 4 O 15 (M denotes Li, Na and K) ceramics. The samples were prepared by the conventional ceramic technique. Sintering characteristics of Ca 0.8 (MCe) 0.1 Bi 4 Ti 4 O 15 and CaBi 4 Ti 4 O 15 ceramics w…
A semiempirical "universal" corresponding states relationship, for the dimensionless transport coefficients of dense fluids as functions of the reduced configurational entropy, was proposed more than 20 years ago and established by many simulations. Recent density functional analysis predicts a universal freezing-temp…
The three-dimensional structure of metastable exfoliated-restacked WS 2 (r-WS 2 ) has been determined by the atomic pair distribution function (PDF) technique. We show that the structure of r-WS 2 is not a random turbostratic assembly of layers, as previously thought, but it can be better regarded as a monoclinic stru…
In this work, isotactic poly(propylene) (iPP) was finely dispersed in immiscible atactic polystyrene (PS) matrices. When the dispersion obtained is fine enough (droplet size of approximately 1–2 μm), the iPP crystallizes in a fractionated fashion at temperatures between 104 and 42°C. By applying a self-nucleation proc…
This paper describes photoluminescence (PL) stabilization through chemical modification of freshly prepared porous silicon (PSi) surfaces. As-anodized PSi surfaces react with 1-alkenes, non-conjugated dienes and aldehydes at elevated temperatures to form organic monolayers covalently bonded to the surface. This therma…
We investigate interfacial and capillary phenomena in a simple model for a fluid of hard rods, viz. the Zwanzig model, in which the orientations of rectangular blocks are restricted to three orthogonal directions. The theory, which is based on an Onsager-like free energy functional, predicts local biaxial ordering at…
Structural and light-emitting properties of nanoparticles of ZnS:Mn annealed in vacuum at temperatures up to 525 °C are presented. Annealing the 3.5 nm particles at temperatures up to 350 °C caused growth of some particles without substantial change in the luminescence or ZnS lattice. After annealing at 400–525 °C, th…
The stability of derivatized mesoporous silicon mirrors in simulated human blood plasma has been assessed. The rate at which they are dissolved in-vivo is predicted to be tunable by surface chemistry over timescales of weeks to years, and high reflectivity can be maintained until the bottom of the multilayer stack sta…