Materials Literature
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The literature data on the adsorption of sulfates by soils were reviewed. Factors affecting the adsorption of sulfates and the major mechanisms of sulfate adsorption were considered, including the most important of them: the ligand exchange with the formation of surface outer-and innersphere complexes and the Coulomb…
Abstract The hydrolysis of four alkoxysilane agents, γ‐methacryloxypropyl trimethoxysilane (MPS), γ‐mercaptopropyl trimetoxysilane (MRPS), octyl trimethoxysilane OS), and N ‐phenyl‐γ‐aminopropyl trimethoxysilane (PAPS), was carried out in an ethanol/water (80/20) solution under both acid and basic conditions. 1 H, 13…
Bifunctional nanocomposites with superparamagnetic and NIR luminescent properties were synthesized by a layer-by-layer and a modified Stöber method. Fe 3 O 4 nanoparticles as the core were coated with NaYF 4:Ln 3+ (Ln = Nd, Er, Pr, or Ho) to form the first layer. Then, the second layer was coated with silica to improv…
The crystal structures of minerals and inorganic compounds with OPb 4 oxocentered tetrahedra are reviewed. It is shown that the OPb 4 tetrahedral units may link by sharing common Pb atoms to form structural units of various shape and dimensionality. These units determine basic topology of the structures and influence…
A correlation between genome size and cell volume has been observed across diverse assemblages of eukaryotes. We examined this relationship in diatoms (Bacillariophyceae), a phylum in which cell volume is of critical ecological and biogeochemical importance. In addition to testing whether there is a predictive relatio…
A lead-free piezoelectric ceramic binary system based on bismuth sodium titanate (Bi0.5Na0.5)TiO3 (BNT)-bismuth potassium titanate (Bi0.5K0.5)TiO3 (BKT) was synthesized by conventional mixed-oxide technique. The XRD analysis showed that the rhombohedral-tetragonal morphotropic phase boundary (MPB) of the Bi0.5 (Na1-xK…
In this study, size and surface effects on temperature and frequency dependent magnetic properties of superparamagnetic Fe3O4 nanoparticles in a size range of 1.1-11 nm are investigated by SPR technique. We used a theoretical formalism based on a distribution of diameters or volumes of the nanoparticles following logn…
The photosynthetic apparatus of green sulfur bacteria, the chlorosome, is generally considered as a highly efficient natural light-harvesting system. The efficient exciton transport through chlorosomes toward the reaction centers originates from self-assembly of the bacteriochlorophyll molecules. The aim of the presen…
Abstract Epoxidized soybean oil (ESO) was converted to a polysoap (PESO) via a two‐step synthetic procedure of catalytic ring‐opening polymerization, followed by hydrolysis (HPESO) with a base. Various molecular weights of PESO and HPESO were prepared by varying the reaction temperature and/or catalyst concentration.…
In this work, two-dimensional surface quasi-crystal patterns were developed by using a novel azobenzene-containing amorphous material (IAC-4), which was newly synthesized for the application. IAC-4 contains a core of isosorbide moiety and two push-pull type azo chromophores as the inner part. The periphery of IAC-4 is…
Matching two geometric objects in two-dimensional (2D) and three-dimensional (3D) spaces is a central problem in computer vision, pattern recognition, and protein structure prediction. In particular, the problem of aligning two polygonal chains under translation and rotation to minimize their distance has been studied…
The bandgap energies of semiconductor quantum dots and wires are investigated with respect to the effects of size, dimensionality, and also composition using a nanothermodynamic model. The results indicate: (1) that the bandgap energy increases with decreasing the nanocrystal size for groups IV, III−V, and II−VI semic…
Polymer microcapsules can be used as controlled release systems in drugs or in foods. Using layer-by-layer adsorption of common food proteins and polysaccharides, we produced a new type of microcapsule with tunable strength and permeability. The shell consists of alternating layers of pectin and whey protein fibrils,…
Nanofibers produced by electrospinning are already being used in a vast array of products in many industries. However, the volume of production of nanofibers has been being a bottleneck restricting their applications. In this work we reported a novel method to fabricate continuous and uniform nanofibers by electrospin…
Synthetic polymers have become an indispensable part of the daily‐life of human beings and the biodegradable class of polymers hold immense value in therapeutics. Fatty acid incorporation in biodegradable polymers renders flexibility, low melting point, hydrophobicity, and pliability properties. At the same time, degr…
[AuCl(SMe 2 )] reacts with HC≡CR (R = bpyl = 2,2′-bipyridine-5-yl ( 1 ), phtpyl = phenyl-4-(2,2′:6′,2′′-terpyridine-4-yl) ( 2 )) and NEt 3 (1:1:3) to afford the polymers [Au(C≡CR)] n (R = bpyl ( 3 ), phtpyl ( 4 )). The new alkyne HC≡Cphccbpyl ( 5, phccbpyl = 4-C 6 H 4 C≡Cbpyl) has been prepared by Sonogashira coupling…
Cryptand-like porphyrinoid assembled with three 2,6-dipyrrylpyridine chains binds alcohol at each molecular crevice in the C 3 h symmetric conformation through three hydrogen bondings. This receptor binds dichloroacetic acid at each crevice in the D 3 symmetric conformation, where strong positive allosteric effect was…
In-situ Raman measurements using a gated spectroscopy system revealed irreversible changes at 800-1000 °C in a natural red spinel (with 2 cation mol% Cr and 1 cation mol% Zn) and at 1100-1200 °C in a natural clear spinel (without Cr or Zn). Our observations of rapid broadening of a mode at 409 cm −1 and the appearance…
This paper discusses the implementation of a low-cost 128 times 128 uncooled infrared microbolometer detector array together with its integrated readout circuit (ROC) using a standard 0.35 mum n-well CMOS and post-CMOS MEMS processes. The detector array can be created with simple bulk-micromachining processes after th…
Surface x-ray diffraction was used to determine the atomic structures of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ thin films, grown monolayer by monolayer on ${\mathrm{SrTiO}}_{3}$ by pulsed laser deposition. Structures for one-, two-, three-, four-, six-, and nine-monolayer-thick films we…