Materials Literature
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A highly regular mesh of hexagonal boron nitride with a 3-nanometer periodicity and a 2-nanometer hole size was formed by self-assembly on a Rh(111) single crystalline surface. Two layers of mesh cover the surface uniformly after high-temperature exposure of the clean rhodium surface to borazine (HBNH)3. The two layer…
The issue of dislocation formation in a strained epitaxial heterostructure was the focus of attention in the preceding chapter. Residual stress was assumed to originate from the combination of a mismatch in lattice parameters between the materials involved and the constraint of epitaxy. The discussion in Chapter 6 led…
Investigations have continued for economical utilization of lignocellulosic wastes, which represents one of the environmental problems facing the third world countries. The use of sugar-cane bagasse, rice straw, and waste paper as cellulose-containing waste stuff for obtaining soil conditioners is the basic aim of thi…
Incorporation of fillers in elastomers results in a profound effect on mechanical properties of the composites formed. Significant study has been carried out on this topic. Fillers are customarily classified into organic and inorganic. The latter class includes calcium carbonate, talc, barium sulphate, china clay (kao…
The existence of residual stress in films deposited on substrates and the effects of such stress on delamination and cracking were recognized as early as the nineteenth century. For example, an antimony film deposited on a substrate was found to be prone to cracking as a result of vibration or local application of hea…
Abstract Silver dendritic nanoparticles of uniform size and morphology have been prepared at room temperature using ascorbic acid as a reducing agent and sodium polyacrylate (PAA) as a protective agent in aqueous solution.
Abstract It was found that single-walled carbon nanotubes are stably dispersed into a low molecular-weight hydrogel (β-d-glucopyranoside–azonaphthol conjugate). From absorption and fluorescence spectral observations and microscopic images, it was shown that this gelator tends to orientate on the surface of SWNTs and s…
The size and molecular mass of water-soluble interpolyelectrolyte complex (PEC) formed between poly( l -glutamate) and poly(amido amine) dendrimer in aqueous solution were estimated as a function of the decreasing pH from the turbidities ( τ ) and their wavelength dependence, by comparison with numerical τ calculation…
The pore size distributions of bundled single-walled carbon nanotubes were investigated by N 2 adsorption and desorption. It was found that the pore sizes are in two main ranges: <5 nm and 10−100 nm. Furthermore, their heating in an inert gas, CO 2, or H 2 at 800 °C did not change the pore size distribution, even thou…
The ground-state geometries, electronic structures, and vibrational frequencies of alkali metal−B 5 - MB 5 (M = Li, Na, K, Rb, and Cs) and alkaline earth metal−B 5 - MB 5 + (M = Be, Mg, Ca, and Sr) clusters were investigated using ab initio self-consistent field and density functional theory (DFT) methods. Calculation…
A density functional theory (DFT) study has been conducted to investigate the structural and electronic properties of PdO/HZSM-5 and thereby the relationship between PdO and the acid sites of HZSM-5. Different cluster models of PdO/HZSM-5 based on experimental and theoretical works are presented. The study shows that…
Pristine single-wall carbon nanotubes (SWCNT's) filled with ${\mathrm{C}}_{60}$ are investigated with resonance Raman spectroscopy. Both totally symmetric modes of ${\mathrm{C}}_{60}$ exhibit a surprising splitting into two components with a slightly different resonance behavior and an apparent loss of polarization. T…
Fluorescence microscopy techniques are used to investigate diffusion and wetting at the interior surface of template-synthesized silica nanotubes. Imaging of individual nanotubes reveals that complete modification of the nanotube interiors with hydrophobic ligands is attained during nanotube synthesis. Fluorescence re…
Abstract Blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) in the amorphous state were miscible in all of the blend compositions studied, as evidenced by a single, composition‐dependent glass‐transition temperature observed for each blend composition. The variation in the glass‐transiti…
Wood fiber reinforced polypropylene composites containing different types of wood fiber (hard and softwood fiber) were prepared by an injection molding and a compression molding process. Influence of different processing systems and compatibilizer on the composite mechanical properties was investigated. The present st…
Conducting poly(o-toluidine) (POT) with multiwalled carbon nanotubes (MWNTs) nanocomposite (POT-MWNTs) was synthesized by oxidative polymerization. Chloroform solutions of the material were used for the optical characterizations by means of UV-visible spectroscopy and for the fabrication of Langmuir-Schaefer (LS) film…
Controlling the spatial organization of cells is vital in engineering tissues that require precisely defined cellular architectures. For example, functional nerves or blood vessels form only when groups of cells are organized and aligned in very specific geometries. Yet, scaffold designs incorporating spatially define…
The buildup of layer-by-layer assemblies onto gold surfaces from water-soluble charged polyelectrolytes and proteins is examined using quartz crystal microgravimetry (QCM) and electrochemical techniques. Polyelectrolytes such as poly(styrenesulfonate) and poly(ester sulfonic acid) (Eastman AQ-29D polymer) adsorb spont…
A scalable method for controlled synthesis of luminescent compound semiconductor nanocrystals (quantum dots) using microemulsion-gas contacting at room temperature is reported. The technique exploits the dispersed phase of a microemulsion to form numerous identical nanoreactors. ZnSe quantum dots were synthesized by r…
We have studied the hydrolytic degradation of high molecular weight poly(p-dioxanone), PPDX, sutures. The samples were degraded either in distilled water or in a phosphate buffer at 37 degrees C, and the starting viscosity-average molecular weight was 130 kg/mol. The hydrolytic degradation of PPDX occurs in an approxi…