Materials Literature
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Abstract A periodic ordered mesoporous organosilica containing uniform ethane groups in the pore walls was prepared using microwave heating to produce 1.5–2.5-μm uniform particles with spherical morphology.
Experimentally based lattice energies are calculated for the apatite family of double salts M(5)(PO(4))(3)X, where M is a divalent metal cation (Ca, Sr, Ba) and X is hydroxide or a halide. These values are also shown to be estimable, generally to within 4%, using the recently derived Glasser-Jenkins equation, U(POT) =…
The selective catalytic reduction (SCR) of N 2 O with CH 4 in the absence and presence of excess O 2 has been studied over ion-exchanged Fe−BEA catalyst by the combination of an activity test with in-situ infrared spectroscopy to understand the nature of the surface species involved in the SCR of N 2 O with CH 4 . Fro…
The Johari−Goldstein (JG) secondary relaxation, presumed to be universal, has never been seen in 1,4-polyisoprene (PI) by dielectric spectroscopy, despite very many measurements extending over the past half-century. By using a high-resolution capacitance bridge, we are able to show the existence of a secondary relaxat…
The thixotropic properties ofthermoreversible organogels composed ofN-3-hydroxypropyl dodecanamide and various apolar fluids have been investigated by X-ray scattering, light microscopy, and rheo-optics experiments. This revealed that gel formation occurs via a precipitation process. Depending upon the cooling rate, l…
A nearly-free-electron (NFE) model to describe STM spectroscopy of (111) metal surfaces with Kondo impurities is presented. Surface states are found to play an important role giving a larger contribution to the conductance in the case of Cu(111) and Au(111) than Ag(111) surfaces. This difference arises from the farthe…
Self-assembly of structurally tunned nearly monodispersed HgTe - ssDNA nanostars of average size 1.4 nm have been achieved by manipulating HgTe nanoparticles using single stranded (ss) DNA under galvanostatic condition. The nanostars are linked with one another by ssDNA of length 0.35 nm. Whereas, HgTe nanoparticles w…
The effect of organoclay platelets on morphologies of three blend compositions (80/20, 20/80, and 99.5/0.5 w/w) of nylon-6 (N6) and poly(ethylene- ran -propylene) rubber (EPR) has been studied by scanning and transmission electron micrographs. For the 80/20 (w/w) N6/ERP blend, the dispersed domain size ( D ) of EPR ph…
Large-scale arrayed ZnO crystals with a series of novel morphologies, including tower-like, flower-like, and tube-like samples, have been successfully fabricated by a simple aqueous solution route. The morphology and orientation of the obtained ZnO crystal arrays can be conveniently tailored by changing the reactants…
Bu3SnOEt, Bu2Sn(OEt)2, and BuSn(OEt)3 were used as initiators of ring‐opening polymerizations of ϵ‐caprolactone conducted in 2 M solutions in chlorobenzene with monomer/functional group ratios of 50/1. Time‐conversion curves were recorded in the temperature range of 30–90°C. The reactivity of the initiators increased…
The Berkeley Structural Genomics Center (BSGC) pursues an integrated structural genomics program designed to obtain a near-complete structural representation of two minimal genomes: Mycoplasma genitalium (MG) and Mycoplasma pneumoniae (MP), two related human and animal pathogens. The MP gene MPN428 (gi:1674097) encode…
The use of phosphonic acids [(HO)2P(O)R, R = Ph or Ph‐o,m,p‐NO2] in conjunction with a water‐tolerant Lewis acid, ytterbium trifluoromethanesulfonate [Yb(OTf)3], induces the cationic polymerization of p‐methoxystyrene (pMOS). The polymerization is performed by addition of pMOS to a suspension of either nitrophenylphos…
Aliphatic–aromatic polyamides of castor oil based dimer acid (DA) with various aromatic diamines, viz., 4,4′‐diaminodiphenyl sulfone (SD), 4,4′‐diamino‐diphenyl methane (MD), and p‐phenylene diamine (PD) were synthesized using triphenylphosphite (TPP) as condensation reagent. Pyridine and N,N‐dimethyl formamide (DMF)…
The use of phosphorus as a co‐catalyst enabling modification of the kinetic equilibrium between the elementary growth steps of multiwalled carbon nanotubes and induction of a mechanism of sequential catalytic growth is reported. The mechanism produces nanotube‐based filaments periodically inserted with catalyst nanopa…
Drying is an essential step in many production and treatment processes. The control of dry product quality is more and more required in order to insure a good using or handling of the material. Then new mathematical models should integer these requirements and consider the phenomena of shrinkage. This work gives a mat…
Drying is an essential operation of the wood industry. Computational models of wood drying appeared several decades ago. They started with just mass transfer in one dimension. Nowadays, comprehensive models exist, that can deal with three dimensions and comprehensive physical and mechanical formulation. Provided a com…
In the present work, we sought to improve our sparkle model for the calculation of lanthanide complexes, SMLC,in various ways: (i) inclusion of the europium atomic mass, (ii) reparametrization of the model within AM1 from a new response function including all distances of the coordination polyhedron for tris(acetylace…
A simple criterion to identify potential phase‐change materials is developed using density functional theory. These compounds rely on the switching between an amorphous and a crystalline state. Here it is demonstrated that suitable alloys have an average valence electron number larger than 4.1 and show p‐electron bond…
The fabrication of carbon nanotubes (CNTs) with controlled cross‐sectional shapes is reported for the first time. Anodic porous alumina with triangular openings is used as a template for the chemical vapor deposition synthesis of the CNTs with triangular cross‐sections (see Figure). The CNTs can be applied to the fabr…
Several experimental methodologies exist for measuring volatilities; however, results show great dispersion and sometimes lack of agreement between different methods. The aim of our study was to compare the performance of three static headspace methods (vapor phase calibration, VPC; phase ratio variation, PRV; and liq…