Materials Literature
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BACKGROUND: Poly [(R)-3-hydroxybutyric acid] (PHB) is a prokaryote storage material for carbon and energy that accumulates in cells under unbalanced growth conditions. Because this class of biopolymers has plastic-like properties, it has attracted considerable interest for biomedical applications and as a biodegradabl…
Abstract Flour rice husk (FRH) was employed as a filler in block copolymer polypropylene (PPB) in order to prepare polymer‐based reinforced composites. Four coupling agents were selected to modify the surface of the rice husk in the composite materials, including two types of functionalized polymers [PP homopolymer gr…
The magnetic anisotropy of epitaxial La0.67Sr0.33MnO3 (LSMO) thin films on vicinal, TiO2-terminated SrTiO3 substrates is investigated. Atomic force microscopy shows a regular step-terrace structure on the LSMO surface which is a replication of the surface of the substrate. The films show in-plane uniaxial magnetic ani…
A series of amine bis(phenolate) ligand precursors and their group 4 metal complexes have been prepared, characterised by single-crystal X-ray diffraction, and tested for ring opening polymerisation of epsilon-caprolactone.
We report the preparation of a poly(acrylic acid) polymer brush from a flat silica substrate using a surface-initiated atom transfer radical polymerization of tert -butyl acrylate. Significantly, we use a chemical free deprotection strategy through pyrolysis of the tert -butyl esters to the corresponding carboxylic ac…
The reaction of [M(H(2)L(i))] (M = Cu, Zn) and U(acac)(4) in refluxing pyridine produced the trinuclear complexes [[ML(i)(py)(x)](2)U] [L(i) = N,N'-bis(3-hydroxysalicylidene)-R, R = 1,2-ethanediamine (i = 1), 2-methyl-1,2-propanediamine (i = 2), 1,2-cyclohexanediamine (i = 3), 1,2-phenylenediamine (i = 4), 4,5-dimethy…
This communication reports on the growth of highly uniform KNbO3 nanowires exhibiting a narrow diameter distribution around 60 nm and a length-to-width ratio up to 100. The nanowires were prepared by a hydrothermal route, which enables simple, gram-scale production. A systematic study of the synthesized nanowires in t…
Abstract The production of carboxymethylcellulose (CMC) from bleached cellulose pulps obtained from Posidonia oceanica was explored. The optimal reaction conditions were studied for the carboxymethylation of cellulose in organic liquids. The carboxymethylation reaction was carried out with NaOH and monochloroacetic ac…
Molecular orbital energy minimizations were performed with the B3LYP/6-31G(d) method on a [((OH)3SiO)3SiOH-(H3O+).4(H2O)] cluster to follow the reaction path for hydrolysis of an Si-O-Si linkage via proton catalysis in a partially solvated system. The Q3 molecule was chosen (rather than Q2 or Q1) to estimate the maxim…
Point defects, including atom vacancies, adatom, and Stone-Wale defects, close to a (5,5) single-walled carbon nanotube (SWNT) open end were studied by density functional theory (DFT), semiempirical PM3 methods, and the empirical Brenner potential. It is found that defect stability increases as they become closer to t…
We report on results of the first realistic electronic structure calculations of the Pu-based PuCoGa5 superconductor based on the dynamical mean field theory. We find that dynamical correlations due to the local Coulomb interaction between Pu f-electrons lead to substantial modification of the electronic structure wit…
We present inelastic neutron scattering measurements on the intermetallic compounds Ce(Ru$_{1-x}$Fe$_x$)$_2$Ge$_2$ ($x$=0.65, 0.76 and 0.87). These compounds represent samples in a magnetically ordered phase, at a quantum critical point and in the heavy-fermion phase, respectively. We show that at high temperatures th…
We have developed the electron-phonon matrix element in single-wall carbon nanotubes by using the extended tight-binding model based on density functional theory. We calculate this matrix element to study the electron-phonon coupling for the radial breathing mode (RBM) and the $G$-band $A$ symmetry modes of single-wal…
A complex InAs/CdSe/ZnSe core/shell1/shell2 (CSS) structure is synthesized, where the intermediate CdSe buffer layer decreases strain between the InAs core and the ZnSe outer shell. This structure leads to significantly improved fluorescence quantum yield as compared to previously prepared core/shell structures and en…
Ferromagnetic shape memory alloys ${\mathrm{Ni}}_{2+x}{\mathrm{Mn}}_{1\ensuremath{-}x}\mathrm{Ga}$ were studied in the range of compositions $0.16\ensuremath{\leqslant}x\ensuremath{\leqslant}0.36$. The experimental phase diagram, constructed from differential scanning calorimetry, transport, and magnetic measurements,…
We have identified a new type of transition from extended to localized vibrational states in one-dimensional graded elastic chains of coupled harmonic oscillators, in which the vibrating masses or nearest-coupling force constants vary linearly along the chain. We found that the delocalization transition occurs at the…
Pulsed laser deposition (PLD) is a good method for growing high-quality functional oxide thin films because of the technical simplicity and the ease with which deposition can be switched from one material to another. However, the repeatability of film quality is often hard to achieve, especially when using several dif…
In this study, we explored the use of semiconductor quantum dots (QDs) as fluorescence labels in immunoassays for simultaneous detection of two species of foodborne pathogenic bacteria, Escherichia coli O157:H7 and Salmonella Typhimurium. QDs with different sizes can be excited with a single wavelength of light, resul…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTLarge Aqueous Aluminum Hydroxide MoleculesWilliam H. CaseyView Author Information Department of Chemistry and Department of Geology, University of California, Davis, California 95616 Cite this: Chem. Rev. 2006, 106, 1, 1–16Publication Date (Web):December 7, 2005Publication Histo…
Abstract A series of copolyamides of various compositions of nylon 6 and nylon 6,18 were produced. Increased resistance to organic solvents resulted from greater incorporation of nylon 6,18, as shown by decreasing solubility. High‐resolution solution NMR indicated there were four amide carbonyls that corresponded to t…