Materials Literature
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Three collections of Harpephyllum caffrum bark were made from the same female tree in the Eastern Cape during 2003/2004 and tested for antibacterial and antifungal activity. The highest antibacterial activity was detected with plant material collected in June 2003 and December 2003, with a decline in activity in extra…
Fluoroquinolones are broad-spectrum antimicrobial agents that seem to reach their intracellular target site (DNA gyrase) in Escherichia coli by means of an uptake process through the outer and inner membranes. Delivery of quinolones with liposomes has many advantages than the free form of the drug. Liposomes may repre…
Abstract Crosslinking behaviors of acrylonitrile butadiene rubber (NBR)/poly (vinyl chloride) (PVC) alloy, filled with anhydrous copper sulfate (CuSO 4 ) particles, were investigated for the first time by dynamic mechanical analysis (DMA) under hetero and isothermal modes, respectively. In the heterothermal testing, (…
A multi-scale model is presented that captures the experimentally observed behaviour of electroluminescence (EL) in carbon nanotube field-effect transistors (CNFETs) under ambipolar bias conditions, namely variations in mobile EL intensity, localized EL at a contact, and localized EL at a charge defect. A full, quantu…
In this study, we used PAMAM dendrimers ( G1 − G4 ) as stationary phases to deposit porphyrin-intercalated DNA onto ITO electrodes. The surface density of the external amino moieties of the dendrimers, i.e., the cationic charge density on the surface, increased with each generation, and correspondingly increased the s…
Abstract Polyaddition reaction of aromatic bis(2‐oxazolines) with aliphatic dicarboxylic acids, hence AA + BB type reactions, was studied. 1,4‐Bis(2‐oxazolin‐2‐yl)benzene (TBOX) and 1,3‐bis(2‐oxazolin‐2‐yl) benzene (IBOX) as AA monomer and aliphatic dicarboxylic acids with the number of carbon atoms 4–12 as BB monomer…
Two models exist for the orientational distribution of the long molecular axes in smectic-A liquid crystals: the conventional unimodal distribution and the "cone-shaped" de Vries distribution. The de Vries hypothesis provides a plausible picture of how, at a molecular level, a first-order Sm-A to Sm-C* transition may…
A hierarchical high-fidelity analysis procedure is adopted for predicting the critical buckling load of filament wound laminated conical shells. This hierarchical procedure includes three levels of fidelity for the analysis. Level-1 assumes that the shell buckling load can be predicted by using simply supported bounda…
A method for synthesizing multiwalled carbon nanotubes (MWNTs) beaded with Cu 2 O nanospheres has been developed. In this work Cu(CH 3 COO) 2 ·H 2 O served as the precursor and NaBH 4 as the reducing agent, and the produced Cu 2 O nanoparticles were deposited on the MWNTs with the help of poly(vinyl pyrrolidone) (PVP)…
Crystalline β-Ga 2 O 3 nanorods have been prepared from GaCl 3 and humid SBA-15 microparticles (SMP) at low temperature (280–300 °C) using the solvothermal method. The as-synthesized product was characterized by x-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electr…
A series of novel conjugated polymers containing first row transition metal complexes have been synthesized and characterized. Metal complexes including Mn(II), Fe(II), Co(II), Ni(II), and Cu(II) were incorporated into the bipyridine coordination sites of the conjugated polymer backbone. Upon inclusion of the metal co…
Ammonium tetrafluoroborate, a cheap and commonly used chemical, was successfully utilized in this study to synthesize BN-coated MgF 2 nanowires and collapsed BN nanotubes, although previous investigations have indicated that the compound cannot be used as a chemical vapour deposition (CVD) reaction precursor of amorph…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionSynthesis and Physicochemical and Dynamic Mechanical Properties of a Water-Soluble Chitosan Derivative as a BiomaterialJaepyoung Cho, Justin Grant, Micheline Piquette-Miller, and Christine AllenCite this: Biomacromolecules 2…
A phase diagram for the Na 2 O−Al 2 O 3 −H 2 O system at 130 °C is presented in this paper using Schreinemaker's method. The compositions of the clear liquid and the wet solids were analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES). The equilibrium solids are aluminum hydroxide (Al 2 O 3 ·H…
We investigate the low-spin to high-spin transition of cobalt in $\mathrm{La}\mathrm{Co}{\mathrm{O}}_{3}$. The underlying physics of the transition is related to the large totally symmetric relaxation of ligands accompanying the electron conversion from the ${t}_{2g}$ to the ${e}_{g}$ orbitals of ${\mathrm{Co}}^{3+}$.…
This book contains Proceedings of the ACS Symposium entitled Applied Modeling and Computations in Nuclear Science held at the 230th ACS National Meeting in Washington DC, 2005. It combines 24 chapters selected from presented papers, as well as invited review articles written by recognised experts. It represents the st…
The solid lipid nanoparticles based on p-hexanoyl calix[4]arene and loaded with UV blocker trans-2-ethylhexyl-4-methoxy-cinnamate (t-EHMC) can control the photochemistry of the guest, eliminate the photodimerization pathway, and improve the photoblocking properties of t-EHMC.
Excited states of stilbenylpyrroles 1a-1c deactivate by two photochemical processes: cis-trans-isomerization and hydrogen transfer of NH to the stilbene double bond. NH-transfer results in the formation of two quinone dimethane intermediates, 10 and 11, and biradicals 12. Intramolecular cyclization of intermediates 10…
Abstract Summary: Nanofibrous sugar sticks with linear PANCGAMA and cyclic PANCAG glucose pendants were fabricated by electrospinning from acrylonitrile‐based glycopolymers. Field emission scanning electron microscope was used to characterize the morphologies of the nanofibers. Utilizing the specific carbohydrate‐prot…
Oxygen transport in ceramic oxide materials has received much attention over the past few decades. Much of this interest has stemmed from the desire to construct high temperature electrochemical devices for energy conversion, an example being the solid oxide fuel cell. In order to achieve high performance for these de…