Materials Literature
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Using first-principles calculations, we investigate the comparative stability of sub-0.4 nm carbon nanotubes. Compared to the fullerenes C 20 and C 60 , it is found that the most likely carbon nanotubes with a small diameter 0.3 nm are (2,2),(3,1) and (4,0) nanotubes. The spontaneous symmetry breaking of an isolated (…
In this paper, we report the results obtained from a comprehensive characterization of newly synthesized dendrimeric molecules in a solvated environment, by computer-aided simulations. The evidences allowed us to formulate some structure-activity relationships (SARs) between the experimentally verified cytotoxicity/no…
Synthesis and characterization of mono-iron(III)-substituted molybdophosphate, the solidification as a heterogeneous catalyst, and the oxidative dehydrogenation of 2-propanol were reported. The catalyst was isolated as Cs 2.8 H 1.2 PMo 11 Fe(H 2 O)O 39 ·6H 2 O, and characterized by elemental analysis and X-ray diffrac…
It is known that proteins can adopt different folds while sharing similar features for recognition of similar substrates or ligands, for example, in the binding sites of enzyme cofactors such as ATP. On the other hand, proteins that have highly flexible binding sites or belong to large and diverse protein families can…
Exopolyphosphatase/guanosine pentaphosphate phosphohydrolase (PPX/GPPA) enzymes play central roles in the bacterial stringent response induced by starvation. The high-resolution crystal structure of the putative Aquifex aeolicus PPX/GPPA phosphatase from the actin-like ATPase domain superfamily has been determined, pr…
Non-filled MgO nanotube bundles have been fabricated via a thermal evaporation method using Mg strips as the source material. The samples were characterized using x-ray diffraction, scanning electron microscopy and transmission electron microscopy. The as-synthesized nanotubes self-assembled into bundles, and the nano…
The complexation of tetrakis(4-N-methylpyridyl)porphyrin (TMPyP) with free and encapsidated DNA of T7 bacteriophage was investigated. To identify binding modes and relative concentrations of bound TMPyP forms, the porphyrin absorption spectra at various base pair/porphyrin ratios were analyzed. Spectral decomposition,…
Real time, high resolution studies of protein adsorption and structure at the solid–liquid interface using dual polarization interferometry, Neville J Freeman, Louise L Peel, Marcus J Swann, Graham H Cross, Andrew Reeves, Stuart Brand, Jian R Lu
The synthesis and characterization of dendron-coated porphyrins up to the fifth generation are described. Both free base and zinc-cored tetraphenylporphyrin (TPPH 2 and TPPZn) were used, from which the dendrons were divergently grown using the anhydride of acetonide-protected bis-MPA (acetonide-2,2-bis(methoxy)propano…
A new type of 4,4'-bis(styryl)-2,2'-bipyridine functionalized by a dialkylamino-azobenzene group has been prepared. This ligand has allowed the preparation of photoisomerizable octupolar tris(bipyridyl)zinc(II) complexes and the corresponding star-shaped polymer by atom transfer radical polymerization (ATRP) of methyl…
The accuracy of the molecular weights Mn and polydispersities of polymer brushes, determined by stretching the grafted chains using atomic force microscopy (AFM) and measuring the contour length distribution, was evaluated as a function of grafting density sigma. Poly(N,N-dimethylacrylamide) brushes were prepared by s…
By using metalorganic chemical vapor deposition, ZnO nanorods, nanotubes, and nanowalls can be selectively obtained by adjusting the growth pressure from 10 to 0.06 Torr. The appearance of different nanostructures is due to different growth modes. The variation of nanostructure shape with change in pressure is explain…
The shear-induced crystallization behavior of poly(butylene terephthalate) (PBT) has been investigated by in-situ small-angle X-ray scattering at temperatures of 198, 203, and 208 °C as well as by ex-situ atomic force microscopy. Increasing the shear rate and/or the shear strain enhances the crystallization kinetics.…
A surface sol-gel process has been demonstrated to be an effective method for the surface modification of silver island films as unique SERS substrates for monitoring molecular adsorption on a dielectric titania surface. This layer-by-layer approach allows control of the thickness of the dielectric surface with a mono…
The synthesis of the perovskite Li 0.3 La 0.566 TiO 3 by a Pechini-type polymerizable precursor method is described. TGA−DTA analysis was carried out on the precursors, and powder XRD analysis was performed on the final products obtained by heating the precursors over a temperature range from 600 to 900 °C during 2 h.…
A series of low-melting, thermally stable cadmium metal-organic chemical vapor deposition (MOCVD) precursors have been synthesized, structurally and spectroscopically characterized, and implemented in growth of highly conductive and transparent CdO thin films. One member of the series, bis(1,1,1,5,5,5-hexafluoro-2,4-p…
A new cholesterol organogelator 4 was synthesized and its gelation property was evaluated. It was confirmed that 4 was an effective gelator for various organic solvents and could self-assemble into network fibers with a bilayer of folded conformation in some organic solvents. Moreover, organogelator 4 could act as a t…
Amphiphilic 2,17-bis-sulfonato-5,10,15(trispentafluorophenyl)corrole (2) and its Ga and Mn complexes (2-Ga and 2-Mn) form tightly bound noncovalent conjugates with human serum albumin (HSA). Protein-induced changes in the electronic absorption, emission, and circular dichroism spectra of these corroles, as well as res…
A method for the removal of the triblock copolymer template from mesoporous silica SBA-15 in two stages has been developed. The mesopores of SBA-15 are first vacated by treatment with sulfuric acid that decomposes accessible portions of the template via ether cleavage. The concentration of the acid was found to be cru…
TiO 2 -supported transition metal oxides (Mn, Cr, and Cu) for the SCR of NO with NH 3 have been synthesized by wet impregnation. The adsorption and coadsorption of NH 3, NO, and O 2, in conjunction with in situ FT-IR spectroscopy, was used to elucidate the reaction mechanism as the samples were heated from 323 to 673…