Materials Literature
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The effect of postmodification of polyelectrolyte multilayer microcapsules by exposure to organic solvent/water mixtures on their permeability, morphology, and mechanical properties is investigated. We study microcapsules with ultrathin shells composed of alternating polystyrene sulfonate and polyallylamine hydrochlor…
Pb ( Zr x Ti 1 − x ) O 3 (PZT) thin films were coated on Pt/Ti/SiO2/Si substrates by a sol-gel method and then crystallized by 28 GHz microwave irradiation. The elevated temperature generated by microwave irradiation to obtain the perovskite phase is only 480 °C, which is significantly lower than that of conventional…
We describe a novel technique of using fluorescent silica nanoparticles (FSNPs) to detect over-expressed folate receptors, as typical for certain malignancies (metastatic adenocarcinoma, pituitary adenoma and others). Using Stöber's method with some modification, 135 nm size FSNPs were synthesized by a hydrolysis and…
Abstract Reaction of a Mg-Al carbonate layered double hydroxide (LDH) with boric acid leads to a borate-pillared LDH with the stoichiometry [Mg 0.65 Al 0.35 (OH) 2 ][B 3 O 5 ] 0.35 .0.65H 2 O and an interlayer spacing of 1.07 nm. Infrared and 11 B magic angle spinning nuclear magnetic resonance data are consistent wit…
We report results on the desorption of OH- induced by 0-19 eV electrons incident on self-assembled monolayer films made of single and double DNA strands of different orientations with respect to a gold substrate. Such measurements make it possible to deduce the mechanism and site of OH- formation within a biomolecule…
Polypropylene/silica (PP/Silica) composites were prepared by two steps: tetraethyl orthosilicate (TEOS) was first impregnated into PP matrix using supercritical carbon dioxide (SC CO 2 ) as a swelling agent and carrier followed by hydrolysis/condensation reaction of TEOS confined in polymer network. The effects of soa…
Abstract The accuracy of quantitative XPS analysis can be improved using predetermined transmission functions. Two different calibration methods are used for estimating the transmission function T ( E ) of a photoelectron spectrometer, applying a survey spectra approach (SSA) and a quantified peak‐area approach (QPA)…
Single-step synthesis of well-crystallized and pure barium titanate nanoparticles in supercritical fluids, Reverón, Helen, Aymonier, Cyril, Loppinet-Serani, Anne, Elissalde, Catherine, Maglione, Mario, Cansell, François
Austenitic stainless steels are the most favoured construction materials for various components required in chemical, petrochemical, fertiliser and nuclear industries. However, these steels are prone to sensitisation. In the sensitised condition, the steels are quite susceptible to intergranular corrosion and intergra…
The synthesis of ZnO nano-needles using unbalanced magnetron sputtering is reported. A multilayer structure comprised of ZnO(50 nm)/Zn(20 nm)/ZnO(2 µm) was grown on a stainless steel substrate without substrate heating. The growth of ZnO nano-needles was observed on the surface of the multilayer structure after post-a…
Abstract Transmission electron microscopy (TEM) has been used to demonstrate the biological formation of a hollow spherical halloysite-like mineral in freshwater systems. The interaction between clays and microbes was investigated in microbial films from laboratory cultures derived from natural sediments. Optical and…
V(2)O(5) x nH(2)O xerogel films with n = 1.6, 0.6, and 0.3 have been prepared from the sol-gel route by reacting V(2)O(5) with H(2)O(2) followed by drying under ambient conditions and thermal annealing at 110 and 250 degrees C, respectively. After dehydration, V(2)O(5) crystallizes at 300-330 degrees C, as revealed by…
Chiral molecules that self-assemble to form chiral supramolecular structures exhibit interesting structural features reminiscent of tertiary and quaternary structures of proteins and have applications in catalysis and nonlinear optics. Often, these structures are hierarchical, with their chiral structure difficult to…
Raman scattering from binary ${\mathrm{Ge}}_{x}{\mathrm{Se}}_{1\ensuremath{-}x}$ glasses under hydrostatic pressure shows onset of a steady increase in the frequency of modes of corner-sharing $\mathrm{Ge}{\mathrm{Se}}_{4}$ tetrahedral units when the external pressure $P$ exceeds a threshold value ${P}_{c}$. The thres…
First-principles calculations show that AB defects substituting on an O site in ZnO where A, B=N, O, or C are an important class of defects whose physical properties cannot be described by the usual split interstitials but rather by substitutional diatomic molecules. The molecular natures of the (AB)O defects are refl…
Indium oxide (In 2 O 3 ) octahedrons and nanowires were synthesized by chemical vapor deposition (CVD) through selecting appropriate source materials and controlling proper external conditions. The growth mechanisms of In 2 O 3 octahedrons and nanowires were analyzed in detail, based on which growth model of single-cr…
Polycrystalline thin films of double layer manganite La_1.4Ca_1.6Mn_2O_7 (DLCMO) have been deposited by nebulized spray pyrolysis on single crystal LaAlO_3 substrates. These single phase films having grain size in the range 70-100 nm exhibit ferromagnetic transition at T_C ~ 107K. The short range ferromagnetic orderin…
Large quantities of highly pure boron nitride nanotubes (BNNTs) are synthesized through a carbon-free method. Nanotube phonon features are investigated by Raman and Fourier-transformed infrared spectroscopies. Both methods indicate highly pure boron nitride phase. Intense ultraviolet light emission is observed when BN…
We report on the interaction of carbon monoxide with cationic gold clusters in the gas phase. Successive adsorption of CO molecules on the Au(n)(+) clusters proceeds until a cluster size specific saturation coverage is reached. Structural information for the bare gold clusters is obtained by comparing the saturation s…
Abstract The thermal stability of surfactant-modified clays plays a key role in the synthesis and processing of organoclay-based nanocomposites. Differential thermal analysis (DTA), thermogravimetric measurement and differential scanning calorimetry (DSC) were used in this study to characterize the thermal stability o…