Materials Literature
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Abstract Prolonged scale inhibition in excess of one year is a desirable benefit of oil and gas well formation squeeze treatments. Traditionally liquid inhibitors have given the requisite inhibitor residual for up to one year. Operators desire longer inhibition periods. This paper describes a new scale inhibitor techn…
Abstract This paper describes field experience and lessons learned from scale-control operations in a deepwater subsea development in the Campos Basin, Brazil; specifically, from bullheading scale-inhibitor squeezes from the FPSO host, along the production flowlines, into four low-watercut, horizontal subsea wells, co…
Missense mutations in the collagen triple helix that replace one Gly residue in the (Gly-X-Y)(n) repeating pattern by a larger amino acid have been shown to delay triple helix folding. One hypothesis is that such mutations interfere with the C- to N-terminal directional propagation and that the identity of the residue…
In order to study the heating process of water by the microwaves of 2.5-20GHz frequencies, we have performed molecular dynamics simulations by adopting a non-polarized water model that have fixed point charges on rigid-body molecules. All runs are started from the equilibrated states derived from the I$_{c}$ ice with…
Strain induced spin-splitting is observed and characterized using pump-probe Kerr rotation spectroscopy in n-ZnSe epilayers grown on GaAs substrates. The spin-splitting energies are mapped out as a function of pump-probe separation, applied voltage, and temperature in a series of samples of varying epilayer thicknesse…
As part of our investigations of the interest in degradable artificial biopolymers, attention was recently paid to other applications such as analysis of polyelectrolyte complexes or release of one of their polyelectrolyte component. The present work is aimed at comparing the enzymatic degradation of polyelectrolyte c…
Two novel genes (tsB, tsC) involved in the conversion of DL-2-amino-Delta2-thiazoline-4-carboxylic acid (DL-ATC) to L-cysteine through S-carbamyl-L-cysteine (L-SCC) pathway were cloned from the genomic DNA library of Pseudomonas sp. TS1138. The recombinant proteins of these two genes were expressed in Escherichia coli…
The local structure of monoclinic, monohydrate, hexagonal, and pyrochlore WO3 phases was investigated by the extended x-ray absorption fine structure spectroscopy as preliminary studies of model compounds of amorphous and thin film WO3 based electrochromic species. In the four cases, we found a large W-O distribution…
Electric-field-induced changes in absorption and emission spectra of colloidal CdS nanoparticles ranging in size from 1.0 to 5.0 nm in diameter have been measured by using electric field modulation spectroscopy. The analysis of the electroabsorption spectra indicates that the dipole moment in the first exciton state b…
[reaction: see text] Synthesis and characterization of core-modified [26]hexaphyrin (1.1.1.1.0.0). A meso aryl rubyrin isomer and a new 54pi-modified dodecaphyrin are reported.
The substituent patterns of some chemically modified celluloses were characterized as a function of their size distribution, using size-exclusion chromatography coupled to both nuclear magnetic resonance spectroscopy (NMR) and cloud-point measurements. Intact and enzymatically hydrolyzed methyl cellulose (MC) was frac…
Single-crystalline ZnS nanowires coated with graphitic carbon shells were synthesized by thermal evaporation of a mixture of ZnS and SnS powders in a graphite crucible. As-synthesized ZnS/C nanostructures were characterized using X-ray diffraction, scanning electron microscope, and transmission electron microscopy equ…
An effective procedure for the fabrication of patterned nanowire arrays with micron-sized features is presented. Photolithographic methods are utilized to form set patterns onto porous anodic alumina membranes (AAM), and these modified membranes can then be used in the electrochemical growth of nanowire arrays. This a…
This book describes some recent developments in natural and synthetic degradable and biodegradable polymers and materials, including their synthesis and assembly, characterization and degradation studies, as well as the design and exploration of such materials for specific and alternative eco-friendly and sustainable…
The self-assembly of a spherical-morphology block copolymer into V-shaped grooves has been investigated. Although spherical morphology block copolymers typically form a bcc sphere array in bulk, the V groove promotes the formation of a well-ordered fcc close-packed sphere array with the (111) planes of the array paral…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFine Structures in Phase-Separated Domains of a Polyolefin Blend via Spinodal DecompositionXiaohua Zhang, Zhigang Wang, and Charles C. HanView Author Information Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, State Key Lab…
The family of bioplastics known as polylactic acids, or PLA, encompasses the set of polymers of lactide, a cyclic dimer produced by the dehydration of lactic acid, that represents a highly promising and versatile category of biomaterials. The development of PLA into a commodity polymer has spanned over six decades of…
Novel tricyclic ladder oligomethylsilsesquioxanes were prepared by heterofunctional condensation of cis - trans - cis -1,3,5,7-tetraisocyanato-1,3,5,7-tetramethylcyclotetrasiloxane with 1,3-di- tert -butoxy-1,3-dimethyldisiloxane-1,3-diol in the presence of triethylamine in THF. A mixture of stereoisomers of the tricy…
This paper documents a continuation of work published in Langmuir 2005, 21, 8743-8750. We report new aspects of this amino acid adsorption study, including the effect of changing zeolite framework type and results from adsorption of mixed amino acids. In single-amino-acid adsorption experiments, zeolite Y (Si/Al=2.5)…
We have used the flow characteristics of an electrospinning jet to elongate and fix DNA molecules. We embedded and observed fluorescently labeled lambda bacteriophage DNA molecules in polyethylene oxide nanofibers. The embedded DNA molecules were imaged using fluorescence microscopy and found to be stretched to length…