Materials Literature
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Polyhydroxyalkanoates (PHAs) are biodegradable polyesters produced by many bacterial species. They are a natural part of the renewable carbon life cycle and are a sustainable source of plastics into the future. PHA production, however, cost about ten times as much as petroleum-derived thermoplastics. The value of the…
Bond orientational order parameters for the global minimum energy configurations of a number of Lennard-Jones and Morse clusters are calculated. The results demonstrate that the bond orientational order parameters, particularly the third-order invariants, provide a fairly discriminating set of symmetry markers for dif…
Sol−gel processing provides a useful route to novel metastable materials such as molecular hybrids of silica and either transition metal oxides or organic components. Because the properties of these materials depend critically on how the components are combined, we present calculations of the size and structure of sil…
An ab initio method with mixed-basis norm-conserving non-local pseudo-potentials has been employed to investigate the electronic structures of LiMgN. The band structure, electronic density of states and charge density contour plot of LiMgN are also presented. By the calculation, we have found that LiMgN with a zincble…
Dynamic properties and layer displacement-layer displacement correlation functions of the smectic-A films on a substrate are investigated. The eigenfrequencies spectrum and eigenmotions of the film are calculated within the framework of a discrete model. It was found that the static as well as dynamic properties of fr…
The preparation of a series of organically functionalized wormhole-motif microspherical MSU-X silicas mesostructures was achieved by a direct synthesis process involving the addition of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) to mildly acidified solutions of a structure-directing nonionic…
Thin vacuum-evaporated layers of As 40 S 60x Se x composition are investigated using Raman spectroscopy from the viewpoint of thermo-and photostructural transformations in them. These transformations are considered as changes in their network structure including three types of piramidal units AsS 3/2 , AsSe 3/2 and As…
The role of temperature in the formation of high nuclearity nickel(II) citrate spin clusters is explored, revealing how changes in structure and hence magnetic properties can be triggered through desolvation and ligand reorganisation.
Samples of Pb-Sn eutectic alloy with a high density of 8.5 x 10(3) kg/m(3) are levitated with a single-axis acoustic levitator, and containerlessly melted and then solidified in argon atmosphere. High undercoolings up to 38 K are obtained, which results in a microstructural transition of "lamellas-broken lamellas-dend…
We provide experimental evidence for stretching and collapse of neutral polymer layers, already adsorbed at an oil-in-water interface, due to its interaction with surfactants. Upon stretching, the first interaction length (2L(0)) follows a power law dependence on surfactant concentration ( proportional, variant C(x)(s…
We have carried out molecular dynamics simulations of the crystallization of hard spheres modeling colloidal systems that are studied in conventional and space-based experiments. We use microscopic probes to investigate the effects of gravitational forces, polydispersity, and of bounding walls on the phase structure.…
Chevrel-type LiMo 3 Se 3 nanowires dissolved in dimethyl sulfoxide were decorated with 13 nm citrate ligated Au particles (water) and 6 nm trioctylphosphineoxide ligated CdSe particles (tetrahydrofuran) by combining the respective solutions at room temperature, followed by mild acidification with hydrochloric acid in…
HI0719 belongs to a large family of highly conserved proteins with no definitive molecular function and is found in organisms ranging from bacteria to humans. We describe the NMR structure of HI0719, the first solution structure for a member of this family. The overall fold is similar to the crystal structures of two…
Flexible supramolecular cation structures, [(XyDA) 0.5 (crown ethers)] + complexes, were introduced as countercations to [Ni(dmit) 2 ] - anions, which bear an S = 1/2 spin, to form novel magnetic crystals (XyDA = p -xylylenediammonium, dmit 2- = 2-thioxo-1,3-dithiole-4,5-dithiolate, and crown ethers = [12]crown-4, [15…
Residual hydrogen in stainless steel results in a steady outgassing from vacuum chamber walls, hindering the achievement of ultrahigh vacuum conditions. The total content, the binding states, and the diffusivity of residual hydrogen in austenitic stainless steels, which together define the room temperature hydrogen ou…
Palladium nanoparticles within polyelectrolyte multilayers of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) were prepared as seeds for further growth by electroless nickel deposition. The seeds were generated by binding tetraaminepalladium from aqueous solution to PAA carboxylic acid functionalitie…
Ultra-small ZnS nanoparticles have been synthesized by a novel solid−solid reaction between Na 2 S and ZnSO 4 nanoparticles in the confined space of AOT reversed micelles. The reaction was performed by mixing two dry AOT/ n -heptane solutions, containing Na 2 S and ZnSO 4 nanoparticles, respectively. This synthetic ro…
Poly(ethylene oxide)-block-poly(l-lysine) (PEO-PLL) was complexed with an amphiphilic hexa-peri-hexabenzocoronene (HBC). This produced a thermotropic liquid crystalline material (PEO-PLL-HBC), which was investigated by FTIR spectroscopy and differential scanning calorimetry as well as by wide- and small-angle X-ray sc…
Femtosecond transient absorption spectroscopy has been used to characterize charge carrier relaxation from the second excited state (1P) to the first excited state (1S) in colloidal indium phosphide (InP) quantum dots (QDs). A three pulse experiment consisting of a visible pump, infrared pump, and white light probe wa…
The reactions of RE(IO3)3 [RE = Nd, Sm, Eu] with I2O5 and MoO3 in a 1:2:2 molar ratio at 200 degrees C in aqueous media provide access to RE(MoO2)(IO3)4(OH) [RE = Nd (1), Sm (2), Eu (3)] as pure phases as determined from powder X-ray diffraction data. Single crystal X-ray diffraction experiments demonstrate that these…