Materials Literature
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We report a continuous or nearly continuous order–disorder transition from orthorhombic (pseudo-tetragonal) to orthorhombic structure on heating in SrSnO 3 at 377 °C, and a discontinuous transition near 260 °C. The transition at 377 °C is manifested in an order of magnitude increase in Raman linewidths and in a λ-shap…
Abstract Nowadays oligopeptides can be easily synthesized and their secondary and tertiary structure is controlled by the amino acid sequence. Alkylation or lipidation of the hydrophilic peptides adds additional amphiphilicity which can be used in several applications. Examples are given of bioactive compounds (e.g.,…
Campylobacter jejuni is highly unusual among bacteria in forming N-linked glycoproteins. The heptasaccharide produced by its pgl system is attached to protein Asn through its terminal 2,4-diacetamido-2,4,6-trideoxy-d-Glc (QuiNAc4NAc or N,N'-diacetylbacillosamine) moiety. The crucial, last part of this sugar's synthesi…
The three-dimensional structure of the hexameric (alphabeta)(6) 1.2-MDa complex formed by glutamate synthase has been determined at subnanometric resolution by combining cryoelectron microscopy, small angle x-ray scattering, and molecular modeling, providing for the first time a molecular model of this complex iron-su…
B 6 O powders were hot pressed with and without Al 2 O 3 as a sintering additive at temperatures up to 1900°C and a pressure of 50 MPa. The microstructure of a doped and undoped sample was studied by transmission electron microscopy techniques. This paper aims at studying the correlation between micro/nanostructure ev…
Networks of single-wall carbon nanotubes (SWCNTs) are covalently functionalized with oxygen-containing groups. In lower concentration, these functional groups act as stable dopands improving the conductivity of the SWCNT material. In higher concentration however, their role as defects with a certain scattering potenti…
An easy, inexpensive, high-throughput, and scalable one-step microlithography technique to construct a superhydrophobic surface is introduced. The resulting surface can be very precisely designed to have specific dimensions. The dependence of the hydrophobic behavior on the surface dimensions is analytically investiga…
The heat treatment of silicon nitride (Si 3 N 4 ) ceramics with additions of 8, 12, and 16 wt% Yb 2 O 3 was carried out at different temperatures and the evolution of grain boundary (GB) phase was investigated systematically by X‐ray diffraction (XRD) as well as scanning electron and transmission electron microscopic…
Abstract The precursors with a low manganese content ≤ 0.07% Mn were synthesized by spontaneous crystallization from Zn2+, Mn2+ and C2O42−-containing solutions. The initial ratio Zn2+:C2O42− = 1:1 and 1:2 influences the morphology and prevailing orientations of the crystallites in the oxalate samples. The presence of…
Development of high‐efficiency multicontaminant sorbents is critical for commercialization of power plants utilizing integrated gasification combined cycle technologies. A known prototypical sorbent for this application is the compound zinc orthotitanate, Zn 2 TiO 4 (ZTO). Previous work has not completely resolved the…
This paper reports the texturing behavior of β‐sialon by strong magnetic field alignment (SMFA) during slip casting, followed by reaction pressureless sintering, using either α or β‐Si 3 N 4 , Al 2 O 3 , and AlN as the starting materials. It is found that the β‐Si 3 N 4 crystal exhibits a substantially stronger orient…
The effect of hydrostatic pressure on the ferromagnetic ordering transition of the monoclinic Gd5(Si0.375Ge0.625)4 giant magnetocaloric effect compound was investigated using x-ray magnetic circular dichroism measurements in a diamond anvil cell. The Curie temperature TC increases linearly with applied pressure up to…
A semiquantitative correlation between experimental observations and theoretical prediction in electron microscopy is achieved. Experiments conducted on amorphous silicon in the convergent beam electron diffraction mode provide measurements of the reduction of the central-disk intensity. In addition to elastic scatter…
In this paper sorption and desorption of water vapor on hair fibers treated with various oils is investigated, using a dynamic vapor sorption (DVS) apparatus. Results show lower "equilibrium" sorption of moisture for various oil-treated samples compared to the untreated sample. Coconut oil-treated hair had a higher re…
The effects of oxygen pick‐up and sintering additives on the formation of silicon carbide (SiC) fibers from polyaluminocarbosilane are studied. It has been found that the strict control of oxygen pick up during the oxidation curing is essential to produce near‐stoichiometric SiC fibers. When the molar ratio of oxygen…
A ceramic composite mimicking the pervasively cracked microstructure of flexible sandstone (itacolumite) was successfully synthesized by sintering two ceramic materials with different thermal expansion coefficients. A combination of granular KZr 2 (PO 4 ) 3 (high thermal expansion) and powdered KAlSi 2 O 6 (low therma…
Although concrete is an extremely popular material in the building industry, it is very weak in tension, as compared to its strength in compression. Smart prestressing of concrete with shape memory alloy fibers is a promising solution to this limitation. To this end, already stretched shape memory alloy fibers are emb…
The momentum distribution in KD 2 PO 4 (DKDP) has been measured using neutron Compton scattering above and below the weakly first-order paraelectric–ferroelectric phase transition ( T =229 K). There is very little difference between the two distributions, and no sign of the coherence over two locations for the proton…
Clathrochelate iron(II) FeBd 2(S2C2(CN)2Gm)(BF)2 tris-dioximate with a ribbed vic-dinitrile fragment was synthesized as a precursor of the monoribbed-functionalized hybrid phthalocyaninoclathrochelates by nucleophilic substitution of the vic-dichloride FeBd2(Cl2Gm)(BF)2 clathrochelate (1) with the potassium salt of di…
Highly stable gold–silver alloy nanoparticles with varying mole fractions were prepared in aqueous sodium dodecyl sulfate solution by simultaneous reduction of chloroauric acid (HAuCl4) and silver nitrate (AgNO3) using sodium citrate. The formation of alloy nanoparticles was confirmed by UV-visible spectroscopy and tr…