Materials Literature
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A stochastic formulation for the description of antisolvent mediated crystal growth processes is discussed. In the proposed approach, the crystal size growth dynamics is driven by a deterministic growth factor coupled to a stochastic component. The evolution in time of the particle size distribution (PSD) is then desc…
Abstract Glycine crystallization during spray drying has been investigated on a laboratory scale. In order to obtain different polymorphs the experiments have been performed at different hot air temperatures, concentrations, different flow of the solution and spraying air. The obtained crystals were analyzed by means…
Low‐temperature sintering of high‐strength β‐eucryptite ceramics with low positive coefficient of thermal expansion (CTE) was attained using Li 2 O–GeO 2 sintering additive. High‐purity β‐eucryptite could be synthesized using high‐purity and fine amorphous silica, α‐alumina, and lithium carbonate powder mixture at 950…
In this work, polyurethane prepolymers (PUP) were synthesized using different weight-average molecular weight ( M w ) of poly-1,4-butylene glycol adipate (PBA), and then used to prepare modified thermoplastic starch (TPS) in an intensive mixer. The effects of M w of polyurethane soft segments on the structure/properti…
We designed, fabricated and characterized a nano-periodical highly-efficient blazed grating for extreme-ultraviolet (XUV) radiation. The grating was optimized by the rigorous coupled-wave analysis method (RCWA) and milled into the top layer of a highly-reflective mirror for IR light. The XUV diffraction efficiency was…
Abstract Poly( N ‐acryloxysuccinimide) (PNAS) and poly( N ‐acryloxysuccinimide‐ co ‐ N ‐vinylpyrrolidone) (P(NAS‐ co ‐NVP)) of adjustable molecular weights and narrow polydispersities were prepared by nitroxide‐mediated polymerization (NMP) in N , N ‐dimethylformamide in the presence of free SG1 ( N ‐ tert ‐butyl‐ N ‐…
Reaction of the dipyrrin ligand 1,3,7,9-tetramethyl-2,8-diethyldipyrrin with BH 3 ·SMe 2 initially gives a dipyrrin-BH 3 adduct, which eliminates dihydrogen to form the dipyrrin-supported BH 2 borane L H BH 2 . This species is unstable toward isomerization to its dipyrromethane isomer 1, via a (possibly BH 3 catalyzed…
The carotenoid-binding protein (CBP) of the domesticated silkworm, Bombyx mori, a major determinant of cocoon color, is likely to have been substantially influenced by domestication of this species. We analyzed the structure of the CBP gene in multiple strains of B. mori, in multiple individuals of the wild silkworm,…
Abstract A positive effect of ultrasound on crystallization has been shown for many applications especially on small scale. Predictable scale‐up of sonocrystallization is a challenge due to the inherent dependency of ultrasound on scale. The presented research discusses the experimental application of ultrasound to in…
Metal ion (Ag(+), Cd(2+), Zn(2+)) modified CdS quantum dots (QDs) were synthesized and used for Cu(2+) sensing. Modification by these metal ions could enhance the PL intensity of CdS QDs with the extent of the PL enhancement being related to the concentration of the metal ions. Different metal ion (Ag(+), Cd(2+), Zn(2…
We present temperature and power dependent photoluminescence measurements on CdSe nanowires synthesized via vapor-phase with and without the use of a metal catalyst. Nanowires produced without a catalyst can be optimized to yield higher quantum efficiency, and narrower and spatially uniform emission, when compared to…
Abstract A crystal chemistry approach was carried out in order to decipher the mechanisms involved in phase transitions of zirconia. A detailed analysis of structures, based on structural sheets of half fluorite cell thick and described in terms of SDF and HDF (for slightly and highly distorted fluorite) sheets is pro…
Highly aligned CaCu(3)Ti(4)O(12) nanorod arrays were grown on Si/SiO(2)/Ti/Pt substrates by radio-frequency sputtering at a low deposition temperature of 300 °C and room temperature. Structural and morphological studies have shown that the nanostructures have a polycrystalline nature and are oriented perpendicular to…
The effects of particle shape on the vibrational properties of colloidal glasses are studied experimentally. "Ellipsoidal glasses" are created by stretching polystyrene spheres to different aspect ratios and then suspending the resulting ellipsoidal particles in water at a high packing fraction. By measuring displacem…
Size effect in ferroelectrics is treated as a competition between the geometrical symmetry of the ferroelectric sample and its crystalline symmetry. Polarization rotation is shown to be a clear finite size effect that results from this competition, which can be induced by all types of driving forces that are coupled w…
Abstract Polyethylene (PE) has relatively poor adhesion with polar polymeric materials. In an effort to improve the adhesion between PE and thermoplastic polyurethane (TPU), maleic anhydride (MA), hydroxyl (OH), and secondary amine (NHR) functionalized PEs were blended into nonmodified PE. These functional groups will…
Two yttrium(III) coordination compounds, [Y(a3-ptz)2(H2O)5]Cl · 4H2O (1) and [Y(atza)2(H2O)2(CH3OH)]Cl (2) [a3-ptz = 5-[N-acetato(3-pyridyl)]tetrazole; atza = 5-aminotetrazole-1-acetato], have been synthesized. Single-crystal X-ray diffraction analysis reveals that 1 has a distorted monocapped square-antiprism coordin…
MnFe(2)O(4) nanocrystals (NCs) coated with three different surfactants (oleic acid, oleylamine or 1,2-hexadecanediol) and their mixtures, with sizes in range 6-12 nm, were synthesized by high-temperature decomposition of organometallic precursors. The effects of morphology and surface chemistry of MnFe(2)O(4) NCs on t…
BaTiO 3 powders doped with Ag at different Ag/Ba molar ratios were prepared by sol-gel method. The resistivity reached the lowest point of 5.644 Ω·m when Ag concentration was 0.10 at% and the powders were calcined for two times at 800°C and 500°C. XRD and FTIR investigations showed that no new substance was formed aft…
Abstract Isolation step of vancomycin, a glycopeptide antibiotic, is usually done from fermentation broth filtrate, while its adsorption directly from the whole broth could rationalize the process. The equilibrium and kinetics of vancomycin adsorption from broth supernatant, diluted and whole broth on polymeric adsorb…