Materials Literature
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Abstract Specially engineered drug particles can solve solubility and formulation problems, which are major challenges for the pharmaceutical industry. Ultrasound irradiation induces acoustic streaming, and highly localized temperature and pressure within the fluid, which can lead to a reduction in crystal size and th…
SUMMARY Several populations identified and reported from North America and Mongolia under the names Fragilaria elliptica Schumann or Staurosira elliptica (Schumann) Williams et Round were analyzed in detail using light microscopy (LM) and scanning electron microscopy (SEM). The analysis yielded three variants that can…
We combine the hypernetted chain approximation of liquid state theory with the mode-coupling theory of the glass transition to analyze the structure and dynamics of soft spheres interacting via harmonic repulsion. We determine the locus of the fluid-glass dynamic transition in a temperature--volume fraction phase diag…
Heat conduction through the Frenkel-Kontorova chain under the influence of an ac driving force applied locally at one boundary is studied by nonequilibrium molecular dynamics simulations. We observe the occurrence of thermal resonance, namely, there exists a value of the driving frequency at which the heat flux takes…
References ..................................................................................................................................... 316 The term electrochemical reactor is a modification of the chemical engineering term, chemical reactor, reflecting the electrochemical process. The theories in electrochemic…
As curved position-sensitive detectors improve in angular resolution, the effects that fixed incident angle reflection have on X-ray diffraction peaks become more apparent. In this study the effects of sample transparency, incident beam height, detector resolution and sample displacement on the intensity, location, wi…
We investigated the atomic structure of gold nanoparticles with an average size of ∼5 nm in diameter, supported by silica. We used high-energy X-ray diffraction and the atomic pair distribution function (PDF) to probe the local atomic structure. Measurements were performed from 25 to 950 °C. The structure is approxima…
Shape Memory Alloy are considered as one of the best active materials for actuation due to their remarkable properties, mainly their large strain and their power to weight ratio. On the other hand, they also have undesirable features that limit applications. One reason is their large thermal time constant. Antagonisti…
Under the assumption that the structural parameters of a crystalline phase change `smoothly' with increasing pressure, the evolution of the parameters can be parameterized as a function of pressure using continuous monotonic functions. Four different approaches to determine the structural evolution of As 2 O 5 with in…
Abstract Reactive crystallization of calcium sulfate dihydrate (gypsum) was investigated at pH 3.5 and 65 °C in the presence of citric acid and Cr 3+ ions. Concentrations of both additives varied between 0 and 4000 ppm. The combined effect of additives on crystal size distributions, filtration characteristics, and cry…
Abstract Porous, flat membranes of ultrahigh‐molecular‐weight polyethylene (UHMWPE) were prepared by thermally induced phase separation, with mineral oil as a diluent and poly(ethylene glycol) with a weight‐average molecular weight of 20,000 (PEG20000) as an additive. Through the control of the rheological behavior, c…
The electronic structure of organic ferroelectric tetrathiafulvalene– p -bromanil (TTF–BA) have been studied by first-principles calculations. It has been found that two antiferromagnetic ordered states, which are assumed to approximate a spin-singlet state, are more stable than the non-magnetic state. Estimated spont…
We report a theoretical investigation of the ac transport in metallic single-walled carbon nanotubes (SWNTs). In contrast to the dc conductance, we clarify that the ac admittance behavior of finite-length metallic SWNTs does depend on the tube chirality and it is classified into two chirality categories: that of metal…
Abstract A novel transformation of silsesquioxane cages in the coordination sphere of a lanthanide ion is reported. Reaction of in situ prepared ( c ‐C 6 H 11 ) 7 Si 7 O 9 (OLi) 3 with anhydrous ErCl 3 in thf solution afforded the large heterometallic (Er/Li) metallasilsesquioxane cluster ( c ‐C 6 H 11 ) 21 Si 21 O 36…
Nanoparticles are widely used in the papermaking industry as retention/ drainage aids, usually in conjunction with a high mass cationic polyelectrolyte such as cationic starch. However, little convincing knowledge of their role and mechanism in the wet-end system is yet found. This work focused on the role of nanosili…
5,6-Dimethoxyindole-2-carboxylic acid has been electrochemically polymerized to form a polymer that is chemically similar to melanin, a conjugated polymer found in nature. The poly(5,6-dimethoxyindole-2-carboxylic acid) (PDMICA) films are green and electrochromic, changing color from transparent to green and then to p…
This paper reports the occurrence and the crystal structure of fantappièite, a new member of the cancrinite-sodalite group of minerals from Torre Stracciacappe, Trevignano community (Rome, Latium, Italy). The mineral occurs within a volcanic ejectum consisting of dominant sanidine with minor plagioclase, biotite, augi…
The core-shell Zn–ZnO nanostructures were fabricated from Zn-powder embedded in graphite (i.e. carbon matrix) in a thin-films form by an inexpensive vacuum arc technique followed by laser ablation. The grazing incidence X-ray diffraction pattern shows that intensity of Zn-peak decreases, and subtle ZnO-peak increasing…
Abstract Several new methods for the synthesis of phosphorus dendrimers capped with biologically active azabisphosphonates are reported. Monomers bearing either azido or acetylenic groups were designed as building blocks either for attachment onto the surfaces of classical phosphorus dendrimers or for use in the const…
The standard collagen triple-helix requires a perfect (Gly-Xaa-Yaa)(n) sequence, yet all nonfibrillar collagens contain interruptions in this tripeptide repeating pattern. Defining the structural consequences of disruptions in the sequence pattern may shed light on the biological role of sequence interruptions, which…