Materials Literature
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This work reports the results obtained on the synthesis of the Aurivillius oxide SrBi 4 Ti 4 O 15 as carried out by mechanochemically assisted methods. The effects of changing the milling media (vibrating and planetary mills) and the length of the mechanical treatment are discussed. The products obtained were characte…
The porosity and the available surface area of a lignocellulosic fiber can influence the accessibility and reactivity in derivatization and modification reactions because the porous cell-wall network determines the upper size limit for molecules that can penetrate and react with the interior of the wall. To obtain inf…
Abstract Gold nanoparticles deposited [by homogeneous deposition-precipitation (HDP) using urea] on Yb2O3 and other rare-earth oxides (viz. Sm2O3, Eu2O3, and Tb2O3) are novel highly active/selective and reusable catalysts for the selective epoxidation of styrene to styrene oxide by anhydrous or aqueous t-butyl hydrope…
Transmission electron microscopy and X-ray scattering have been used to characterize the microphase segregation of linear−dendritic diblock copolymers in the bulk state. The dendritic block copolymers consisted of a linear poly(ethylene oxide) (PEO) block of 2000 molecular weight attached covalently to a polyamidoamin…
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…