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We report the first application of valence-band photoemission to a quantum-dot system. Photoemission spectra of cadmium sulfide quantum dots, ranging in size from 12 to 35 \AA{} radius, were obtained using photon energies of 20 to 70 eV. The spectra are qualitatively similar to those obtained for bulk cadmium sulfide,…
Enormous impact pressures can develop when a vapor cavity collapses in a liquid, and it is generally held that these pressures are the underlying cause of cavitation damage of surfaces. The rapid growth and disappearance of vapor cavities have been viewed with a surface forces apparatus in liquids, and their effects o…
Studies of the chemistry that occurs on the nanosurfaces of size-selected silicon clusters reveal a number of fascinating qualitative similarities to the behavior of bulk surfaces. However, silicon clusters containing up to 70 atoms appear to be much less reactive than bulk silicon surfaces. This unexpected result sug…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ quantitation of protein adsorption density by integrated optical waveguide attenuated total reflection spectrometryS. S. Saavedra and W. M. ReichertCite this: Langmuir 1991, 7, 5, 995–999Publication Date (Print):May 22, 1991Publication History Published online1 May 2…
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Abstract Tetrafluoroethylene (TFE) was copolymerized with 1‐fluorosulfonyl‐difluoroacetylfluoride (FSDFAF) in both the bulk and solution by using a free radical initiator at temperature 50°C. The presence of sulfonyl fluoride (SO 2 F) functional groups in the copolymers was proved by infrared (IR) spectroscopy. The c…
Abstract Cold plasma treatment of polyester fabric in the presence of several volatile monomers containing expected flame retardant elements was made and some of the flammability characteristics of the plasma/monomer‐treated fabric were studied. The plasma treatment on the fabric caused a slight decrease in both oxyge…
Abstract Mill mixed blend of epoxidized natural rubber and chlorosulfonated polyethylene forms a self‐vulcanizable rubber blend during molding at high temperatures in absence of any vulcanizing agent, which is confirmed by FTIR studies. The extent of vulcanization reaction not only depends upon time and temperature of…
Abstract IR and X‐ray diffraction studies have been carried out on raw and chemically treated pineapple leaf fiber (PALF). The degree of crystallinity, as found by X‐ray diffraction and the crystallinity index as found by infrared methods, decreases on treatment with NaOH and NaClO 2 solutions. The decrease of crystal…
No new experiments are reported in this paper: the paper comprises a re-interpretation of published EPR data of the various di-nitrogen centres in brown diamond, including the new ENDOR results of the authors' previous paper on the W7 centre (see ibid., vol.3, p.3591, 1991). The new evidence about W7 provided by these…
Abstract Flexural test specimens were injection‐molded from polypropylenes added with 0.5 wt % calcium carbonate, talc, p ‐ tert ‐dibutyl‐benzoic acid monohydroxy aluminum, or p‐ dimethyl‐benzylidene sorbitol under cylinder temperatures of 200–320°C. Distributions in the flow direction of higher‐order structures such…
Polycrystalline boron nitride films have been deposited using microwave plasma-enhanced chemical vapor deposition. IR absorption spectra of films deposited using NaBH4 as the boron source in NH3 and H2 gases showed absorptions which are nearly the same as the characteristic vibrational modes seen in cubic and pyrolyti…
Abstract Interaction in the system isotactic polypropylene–calcite was investigated using X‐ray diffraction and transmission electron microscopy. Calcite acts as a weak nucleation agent for polypropylene crystallization and its activity could be increased or decreased by a suitable surface treatment. Investigation of…
Abstract The relationship between the particle sizes and minimum film formation temperature (MFT) of polymer colloids was studied. Early workers had developed theoretical models predicting small particle colloids should coalesce easier and have lower MFTs than those of large colloids. Early published work examining th…
Abstract Flexural test specimens were injection‐molded from polypropylenes added with 0.5 wt % of calcium carbonate, talc, p ‐ tert ‐ dibutyl‐benzoic acid monohydroxy aluminum, or p ‐di‐methyl‐benzylidene sorbitol under cylinder temperatures of 200–;320°C. Properties such as flexural modulus, flexural strength, heat d…
Abstract Three algorithms for draping biaxially woven fabrics on arbitrarily curved surfaces are presented and compared for numerical accuracy and computational expense. The first one minimizes the elastic energy in each fabric cell, while the two others are based on placing a net of interlocked and inextensible fibre…
Thin-film heterostructures of Bi(4)Ti(3)O(12)Bi(2)Sr(2)CuO(6+x), have been grown on single crystals of SrTiO(3), LaAlO(3), and MgAl(2)O(4) by pulsed laser deposition. X-ray diffraction studies show the presence of c-axis orientation only; Rutherford backscattering experiments show the composition to be close to the no…
The dependence of the pre-exponential factor (σ0) on the activation energy (ΔE) is investigated for SeTe, SeTeM, GeSe, and GeSeM glassy alloys where M is a metal. An approximate linear dependence of In σ0 on ΔE is observed in SeTe and SeTeM systems with good quantitative agreement between the expected and cal…
The effect of strain rate on yield point and dislocation density evolution during compression, as well as on the rate and depth of relaxation after some preliminary deformation and on 7.5 MHz ultrasonic attenuation of NaCl crystals is studied. The existence is found of a critical strain rate, at which the applied and…
We measure the viscosity of glycerol by using photon correlation spectroscopy to observe the Brownian motion of small (∼100 nm) polystyrene spheres. By comparing the viscosity measured with different size spheres, we can measure the length scale dependence of the viscosity as the liquid is cooled towards the glass. In…