Materials Literature
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In this study, thermal and microscopic analyses were used to evaluate a variety of carbonate and bicarbonate salts (alkali, alkaline—earth, and other metals), having different thermal stability within the range of poly(ethylene terephthalate) (PET) processing temperatures, as nucleating agents for recycled bottle PET.…
Tausende einzelner Metall‐Nanokristalle mit einem Durchmesser von 2.5 nm bilden die in der rasterelektronenmikroskopischen Aufnahme rechts gezeigten fünf Partikelringe, von denen jeder einen Durchmesser von etwa 1 μm hat. Hier wird eine experimentelle und theoretische Erklärung für die Bildung derartiger Ringe vorgest…
Blends of polystyrene (PS) and polybutadiene (PBD) were investigated by differential scanning calorimetry. From the phase composition diagram of the blends, it appears that PBD dissolves more in the PS-rich phase than does PS in the PBD-rich phase. This result is consistent with the behavior of the specific heat incre…
To improve the mechanical properties and structure of HDPE/CaCO3 composites, a type of modifier, consisting mainly of carboxylated polyethylene (CPE), and a type of CaCO3 grafted with acrylamide (CaCO3(SINGLE BOND)A) were used. The carboxyl group content of CPE was from 1 to 10%. The amide group content on the surface…
Unprecedented structural and compositional features are exhibited by these large vanadium borate clusters (for example 1, see picture on the right). Facile solubilization and crystallization of transition metal oxides by these large, multidentate polyborate ligands portends a rich and diverse chemistry for transition…
Rosettes that are held together by hydrogen bonds (see sketch on the right) were synthesized from metallodendrimers constructed by coordination chemistry. Two orthogonal, noncovalent interactions (metal–ligand and hydrogen bonding) were employed to build these nanosized dendrimers (M ≈ 7–28 kDa).
A scanning probe microscope was used to induce local, nonvolatile field effects in epitaxial, ferroelectric Pb(Zr 0.52 Ti 0.48 )O 3 /SrRuO 3 heterostructures. Field-effected regions with linewidths as small as 3500 angstroms were written by locally switching the polarization field of the Pb(Zr 0.52 Ti 0.48 )O 3 layer;…
Abstract Chemistry is classically concerned with the connection of atoms and molecules into new functional units. The rules of connection are yet to be extended to the generation and connection of larger objects, whose dimensions are measured in nanometers. However, linking objects of this size through molecules appro…
The orientation of the noncrystalline (amorphous) phase in poly(ethylene terephthalate) fibers is analyzed by separating the amorphous scattering in the wide-angle x-ray diffraction patterns into isotropic and anisotropic components. Two parameters are used to characterize the amorphous orientation—the fraction of the…
Bamboo fiber-reinforced polypropylene (PP) composites were prepared. PP and two maleated polypropylenes (s-MAPP and m-MAPP) were used as matrices. Crystallization and interfacial morphology were studied by using differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), and optical microscopy. It ha…
The properties of starch plastic sheets were investigated by stress—strain measurements in relation with starch crystallinity. Granular potato starch was plasticized with different amounts of glycerol and water by extrusion. The materials were amorphous directly after processing. During aging above the glass transitio…
Without sticking to the surface rapeseed oil droplets roll around on a surface prepared in two steps: An aluminum plate is first anodically oxidized and then treated with fluorinated monoalkylphosphates. The contact angles for some polar oils on such surfaces are greater than 150°.
We report measurements of $^{10}\mathrm{B}$ stopping powers in random and Si 〈100〉 directions. The measurements were carried out in the 500--9000 keV energy range for the channeling case and in the 300--800 keV for the random one. For the channeling measurements, the low energy data (500--800 keV) follow a ${\mathrm{v…
Single crystals of V6O13 were grown by chemical vapour treatment; thereafter electrochemically lithiated. The title compound was the first phase formed during electrochemical lithiation at 2.65 V versus Li/Li+. The Li2V6O13 structure can be described as layers of VO6 octahedra stacked perpendicular to the c direction.…
Mineralologi, Krystallografi, Eudialyt, Kent brooksit, Mikrosonde analyse
Thick films (10–12 μm) of NiZn–ferrite (Ni0.6Zn0.4Fe2O4) were grown on single-crystal (100) magnesium oxide substrates using pulsed laser deposition (PLD). The morphology, phase, orientation, strain, and magnetic properties of the as-deposited films were investigated as a function of substrate temperature (400–700 °C)…
The fcc to bcc structural change in the growth of ultrathin iron films is studied for films grown on a (111) fcc surface, in an attempt to mimic the geometry of the martensitic transition in bulk iron, where the interface is formed from the close-packed planes of the two structures. The use of a 2-ML Ni/W(110) substra…
A previously proposed approach for the ab initio evaluation of Hubbard parameters is applied to BEDT-TTF dimers. The dimers are positioned according to four geometries taken as the first neighbors from the experimental data on the κ-(BEDT-TTF)2Cu[N(CN)2]Br crystal. RHF-SCF, CAS-SCF and frozen-orbital calculations usin…
We present a mathematical model to describe the optical phase shift induced by polymer dispersed liquid crystals (PDLCs) on light impinging transversely on the sample. PDLCs are dispersions of liquid crystal microdroplets in a polymeric binder. Droplets appear as optically uniaxial spheres randomly oriented so that th…
The effect of laser intensity on the deposition of diamondlike carbon (DLC) films has been studied using an ArF (193 nm) pulsed excimer laser. Our results are found to be distinct from other studies using Nd-YAG infrared or excimer 248-nm lasers. Two issues concerning the growth mechanism of the films are discussed: (…