Materials Literature
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Hierarchical features of the thermal unfolding-refolding structural transition of hen egg white lysozyme (HEWL) have been studied in the temperature range from 13 to 84 degrees C by using high-resolution wide-angle X-ray scattering (WAXS) measurements at a third-generation synchrotron source. We have gathered high-sta…
Abstract The change of the glass transition temperatures ( T g ) in the blend of poly( L ‐lactic acid) (PLLA) and the copolymers of poly(D, L ‐lactic acid) and poly(glycolic acid) (PDLLA‐PGA) with different D, L ‐lactic acid and glycolic acid composition ratio (50 : 50, 65 : 35, and 75 : 25) was studied by DSC. Dynami…
Two highly emissive conjugated polymers with tethered rotaxane repeat units are reported. Hydrogen bonding between acidic alcohols and the N-heteroaromatic groups in the rotaxanes attenuates polymer fluorescence. In addition, the rotaxane groups create precise three-dimensional pockets for metal binding, which results…
The aim of this work is to obtain amorphous thin films of poly(3-hydroxybutyrate) (PHB) at room temperature. The PHB thin films were obtained by spin-coating of chloroform−polymer solutions on glass substrate. The films were extensively characterized by X-ray diffraction and AFM. In this work it has been shown that th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Functionalized RAFT Agents for Light Harvesting MacromoleculesMing Chen, Kenneth P. Ghiggino, Albert W. H. Mau, Ezio Rizzardo, Wolfgang H. F. Sasse, San H. Thang, and Gerard J. WilsonView Author Information School of Ch…
Self-assembly of alpha-lactalbumin after partial hydrolysis by a protease from Bacillus licheniformis can result in nanotubular structures, which show many similarities to microtubules. Calcium plays a crucial role in this process. The objective of this investigation was to study the role of calcium in more detail. Th…
This communication presents the first functionalization of a hydrogen-terminated silicon-rich silicon nitride (Si3Nx) surface with a well-defined, covalently attached organic monolayer. Properties of the resulting monolayers are monitored by measurement of the static water contact angle, X-ray photoelectron spectrosco…
Abstract Nanocomposites of epoxy resin with montmorillonite clay were synthesized by swelling of different proportions of the clay in a diglycidyl ether of bisphenol‐A followed by in situ polymerization with aromatic diamine as a curing agent. The montmorillonite was modified with octadecylamine and made organophilic.…
Catalytic activity for CH 4 oxidation and resistance to SO 2 poisoning were tested for three LaCo 1 - X Fe X O 3 prepared by reactive grinding. The catalysts prepared by this method showed well-crystallized perovskite structure and various specific surface areas. The activity in CH 4 oxidation correlates well with BET…
Stable water-soluble diammonium tris(2-hydroxypropionato)titanate(IV) [ammonium trilactatotitanate(IV)], (NH4)2[Ti(C3H4O3)3], was prepared in the crystalline form. According to the X-ray single-crystal diffraction data, this compound crystallizes in the cubic cell with a = 11.649(4) angstroms, space group P2(1)3 (no.…
A porphyrin macroring, mimicking the light-harvesting complex of photosynthetic purple bacteria, was synthesized by self-assembling trisporphyrinatoZn(II) complexes with imidazolyl substituents at both molecular terminals. Very strong complementary coordination of imidazolyl to Zn(II) afforded exclusively the cyclic t…
We report evidence for ferroelectricity in bismuth manganite epitaxial films from optical second-harmonic generation (SHG). The change in the polar symmetry of SHG signals under external electric fields is correlated to specific changes in the ferroelectric domain microstructures. We also observe giant enhancement of…
The nucleation-growth-passivation Brust reaction has been modified so as to enrich the product in useful quantities of a 38-atom gold nanoparticle coated with a hexanethiolate monolayer. Two modifications are described, using -78 degrees C reduction temperature and a hyperexcess of thiol. Compositional evidence is pre…
The physical mechanism responsible for nonlinear elastic, hysteretic, and discrete memory response of nonlinear mesoscopic elastic solids has to date not been identified. We show, by nanoindenting mica single crystals, that this response is most likely due to the formation of dissipative and fully reversible, dislocat…
Abstract The reinforcement of poly(dimethylsiloxane) (silicone rubber) imparted by different types of fillers was investigated. Three different techniques of incorporation of silica were compared: the usual blending process, in situ filling process, and introduction of spherical colloidal silicas (Stöber silicas). In…
Abstract In this study, we investigated the effects of untreated precipitated silica (PSi) and fly ash silica (FASi) as fillers on the properties of natural rubber (NR) and styrene–butadiene rubber (SBR) compounds. The cure characteristics and the final properties of the NR and SBR compounds were considered separately…
[reaction: see text] A new class of molecular machine exhibits a hingelike motion upon photoirradiation. The motion (close and open) can be operated by alternate irradiation with UV and visible light. The trans/trans and cis/cis isomers are thermally stable at 40 degrees C, and the photochemical closure reaction (from…
We obtain a general result for the Lamb shift of excited states of multi-level atoms in inhomogeneous electromagnetic structures and apply it to study atomic hydrogen in inverse-opal photonic crystals. We find that the photonic-crystal environment can lead to very large values of the Lamb shift, as compared to the cas…
The energetics of transition and noble metal (Rh, Pd, Cu) vicinal surfaces, i.e., surface energy, step energy, kink energy and electronic interactions between steps, is studied at 0K from electronic structure calculations in the tight-binding approximation using a {\it s, p} and {\it d} valence orbital basis set. Then…
We perform molecular dynamic simulations of liquid nanoparticles deposited on a disordered substrate. The motion of the nanoparticle is characterised by a 'stick and roll' diffusive process. Long simulation times ($\simeq μs$), analysis of mean square displacements and stacking time distribution functions demonstrate…