Materials Literature
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A simple and reliable one-step technique is developed to form robust PAMAM dendrimer–gold nanoparticle nanocomposites using dithiocarbamate-based chemistry. The interparticle spacing and optical properties of films can be readily tuned by controlling the dendrimer generation and/or the mole ratio between dendrimers an…
Abstract Poly(vinyl alcohol) (PVA) is an important water‐soluble polymer. Its many applications (e.g., textile sizing, dispersants, and adhesives) greatly depend on its water solubility and particularly on its dissolution rate in water. In this study, urea, combined with methanol, was adopted to improve the water solu…
Highly cross-linked polymer (HCP) networks are becoming increasingly important as high-performance adhesives and multifunctional composite materials. Because of their cross-linked molecular architectures, HCPs can be strong but brittle. One key goal in improving the performance of an HCP is to increase toughness witho…
We have discovered that poly(ethylenimine)-capped Au nanoparticles can be fabricated into a two-dimensional film by adding toluene into the colloidal solution. The Au nanoparticle film layer creeps up the glass wall of the vial after adding benzenethiol into the toluene phase, thus allowing for a robust Au film to for…
A hybrid colloidal CdTe nanocrystal/bulk GaAs p-i-n heterostructure is demonstrated to have potential for highly efficient light harvesting photovoltaic devices. An array of rectangular channels is fabricated on the surface of the GaAs heterostructure penetrating through its active layer and subsequently filled with w…
Abstract BACKGROUND: The reinforcement of elastomers by the addition of fillers is one of the most important aspects in rubber science and technology. In order to optimise the filler–polymer interface, innovative in situ generation of silica within isoprene rubber was carried out by means of a bottom‐up approach throu…
We describe the electrochemistry of 15 nm diameter silica nanoparticles densely functionalized with ferrocene (FcSiO(2)) through siloxane couplings. Each nanoparticle bears approximately 600 Fc sites, as measured by potentiometric titration (590 Fc) and diffusion-controlled voltammetry (585 Fc) and estimated by XPS (6…
Isocyanide ligands bearing an azo group and one alkoxy chain OC(n)H(2n+1) have been synthesized. They are calamitic liquid crystals for n > 4 and display nematic (n = 8, 12) and SmA (n = 12) mesophases. Their gold(I) compounds [AuX(CNR)] (X = Cl, C(6)F(5); R = C(6)H(4)N horizontal lineNC(6)H(4)OC(n)H(2n+1), n = 4, 8,…
A systematic analysis of the deep level spectrum in the lower half of the bandgap of Au–Zn1−xMgxO (0.056<x<0.18) Schottky diodes is presented. Two deep levels are observed at Ev+580 and Ev+280 meV regardless of the bandgap energy with trap concentrations linearly increasing with the Mg content. The Ev+28…
Exciton dissociation and carrier transport in poly(3-hexylthiophene) (P3HT)/germanium (Ge) nanocrystals composites were investigated by steady-state and time-resolved photoluminescence (PL) as well as photovoltaic (PV) effect. Quenching of the PL quantum yield η and shortening of the PL lifetime τ in the composites we…
We explore the role of coupling between silver nanowires and an underlying silver film in fluorescence enhancement from proximal molecules. Variation of the thickness of an oxide layer separating nanowire arrays from the Ag film causes an alternation in the incident light polarization that produces the highest enhance…
A novel use of two components of Cape aloe, aloin A and aloesin, acting as stabilizers in the preparation of gold and silver nanoparticles, is reported. Stable water-soluble particles of different size and shape are prepared by varying the reaction conditions, temperature, reaction time, and reducing agents. Character…
Abstract The reversible nature of buckling is employed to repeatedly transfer colloids assembled in buckling patterns to flat surfaces. The cycle of colloidal loading–transfer–buckling is repeatedly carried out to fabricate the same colloidal patterns. The key to success is the reduction in the amplitude of the buckli…
The corrosion behaviour of mild steel and 316L austenitic stainless steel was investigated in saline solution containing 1 and 3%NaCl. Specimens with surface roughness of 200, 600 grit emery paper and 1m diamond paste were investigated. The anodic polarization measurement technique was performed at a scan rate of 1mV/…
Anatase crystals with lateral sizes of tens of micrometers are impossible to prepare as thin films on amorphous substrates by normal thin film deposition techniques. When deposited on amorphous substrates, polycrystalline anatase titanium dioxide (TiO 2 ) thin films have typically grain and crystal sizes comparable to…
4-(2-(4-pyridinyl)ethynyl)benzenic diazonium salt (PBD) was synthesized and used to modify the substrate by self-assembly (SA) technique. Following decomposition of the diazonium group in PBD under UV irradiation, the ionic bonds between the diazonium salt and substrate are converted to covalent bonds. The PBD monolay…
Uniform MF/YVO 4:Ln 3+ (Ln = Eu, Dy, and Sm) composite microspheres have been prepared via a simple and economical wet-chemical route at ambient pressure and low temperature. Monodisperse micrometer-sized melamine formaldehyde (MF) colloidal particles were first fabricated by a condensation process of melamine with fo…
Abstract Here, the creation of new supramolecular functional materials based on the reconstruction of three‐dimensional interconnecting self‐organized nanofiber networks by a surfactant is reported. The system under investigation is N ‐lauroyl‐ L ‐glutamic acid di‐ n ‐butylamide in propylene glycol. The architecture o…
An exact description of the complete jamming landscape is developed for a system of hard discs of diameter sigma, confined between two lines separated by a distance 1+sqrt[3/4]<H/sigma<2. By considering all possible local packing arrangements, the generalized ensemble partition function of jammed states is obtained us…
The temperature evolution of the nanoscale structure of ${\text{PbSc}}_{0.5}{\text{Nb}}_{0.5}{\text{O}}_{3}$ (PSN) and $(\text{Pb},{A}^{\ensuremath{''}}){\text{Sc}}_{0.5}{\text{Nb}}_{0.5}{\text{O}}_{3}$, $({A}^{\ensuremath{''}}=\text{Ba},\text{Bi})$ is analyzed by applying synchrotron single-crystal and high-resolutio…