Materials Literature
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We report on the photoinitiated polymerization of phenyl benzoate-based liquid crystalline (LC) thiol-ene monomers in isotropic and anisotropic solvents. The mixing behavior of the thiol-ene monomers with anisotropic cyanobiphenyl solvents was investigated, and unique reactive LC mixtures are formed that exhibit varia…
This paper summarizes the research of the CIS Team at NREL in three major areas: absorber deposition; understanding the role of chemical bath deposited (CBD) CdS in CIS junctions; and in the development of devices without CdS. Low cost, scaleable processes chosen for absorber fabrication include sputtering, electrodep…
The successful introduction of hydrogen for transportation, consumer and military applications will require the simultaneous introduction of small scale hydrogen production-storage and distribution systems for central depot and residential use. These systems will have to be flexible, safe and economical. An integrated…
Density functional B3LYP calculations have been employed to investigate potential energy surfaces for the reactions of scandium, nickel, and palladium oxides with methane. The results show that NiO and PdO are reactive toward methane and can form molecular complexes with CH 4 bound by 9−10 kcal/mol without a barrier.…
We present a novel method, called colloidal lithography, to prepare well-defined model catalysts on planar supports. The method facilitates fabrication of monodisperse catalyst particles with variable, well-defined size, shape, and interparticle distance. The chemical and structural composition of the constituents (i.…
The degradation of S-nitrosothiols (RSNOs) to release NO is believed to be catalyzed by CuI ions, but the mechanism remains unclear. Kinetic experiments have shown that decomposition rates vary significantly with the chemical nature of the RSNO considered. On the basis of first-principles calculations, the catalytic r…
The electret properties of cycloolefin copolymer (COC) films, metalized on one side and charged with corona or electron-beam methods, were investigated. Measurements of the isothermal decay of surface and bulk charges under room conditions and at elevated temperatures and humidities as well as thermally-stimulated cur…
We developed the 1T/1C FRAM device technology using 0.5 /spl mu/m design rule which is perfectly compatible with 0.5 /spl mu/m CMOS logic process. This technology achieves the small 1T/1C FRAM cell size of 12.5 /spl mu/m/sup 2/, and minimized process degradations of ferroelectric material characteristics using low-pow…
A solid state chemistry synthetic approach towards identifying new materials with potentially superior thermoelectric properties is presented. Materials with complex compositions and structures also have complex electronic structures which may give rise to high thermoelectric powers and at the same time possess low th…
The necessity to apply near-toxic amounts of radioprotective drugs to achieve adequate protection during radiation treatments represents a major problem in human medicine. One of the promising strategies to suppress the toxicity of these drugs involves their incorporation into biocompatible polymers. In this study cys…
Recent papers have covered the merits of using finite elements to calculate the thermoelectric device performance for steady-state conditions. Likewise, papers have covered the use of finite elements to model transient cooling conditions. It remains then to model power generation performance with finite elements and c…
Ultrathin ( d < 20 nm) films of cellulose were fabricated by regeneration of trimethylsilylcellulose films, which were deposited on silicon wafers by the Langmuir−Blodgett (LB) or the spin-coating method. Equilibrium film thickness with respect to relative atmospheric humidity was quantitatively measured by ellipsomet…
Argon plasma-pretreated poly(tetrafluoroethylene- co -hexafluoropropylene) (FEP) films were subjected to UV-induced surface graft copolymerization with acrylonitrile (AN). The AN graft-copolymerized FEP (AN-g-FEP) surface was further reacted with hydroxylamine to introduce amidoxime groups on the surface (the amidoxim…
Two tripodal ligands, bis(2-benzimidazolylmethyl)(2-pyridylmethyl)amine (L(1)) and bis(2-pyridylmethyl)(2-benzimidazolylmethyl)amine (L(2)), were synthesized. With the third chromophoric ligand antipyrine (Antipy), three series of lanthanide(III) complexes were prepared: [LnL(1)(Antipy)(3)](ClO(4))(3) (series A), [LnL…
The preparation of polyethylene- block -poly(ethylene- alt -propylene)- block -poly(ethylene oxide) (PE- b -PEP- b -PEO) triblock copolymers by homogeneous catalytic hydrogenation of the precursor poly(1,4-butadiene)- block -poly(1,4-isoprene)- block -poly(ethylene oxide) (PB- b -PI- b -PEO) triblock copolymers, which…
A 3D magnetostatics computer code optimized for Undulators and Wigglers is described. The code uses a boundary integral method and makes extensive use of analytical expressions for the field and field integrals along a straight line. The code outperforms currently available finite element packages in the area of simpl…
Methods for introducing new magnetic, optical, electronic, photophysical, or photochemical properties to semiconductor nanocrystals are attracting intense applications-oriented interest. In this communication, we report the preparation and electronic absorption spectroscopy of colloidal ZnO DMS-QDs. Our synthetic proc…
A synthesis of ordered biphenylene-bridged mesoporous material with a crystal-like periodic pore wall structure is reported.
A general peptide design is presented that links the pH-dependent intramolecular folding of beta-hairpin peptides to their propensity to self-assemble, affording hydrogels rich in beta-sheet. Chemical responsiveness has been specifically engineered into the material by linking intramolecular folding to changes in solu…
Carbon nanotubes can be functionalized via amidation and esterification of the nanotube-bound carboxylic acids. The solubility of these functionalized carbon nanotubes makes it possible to characterize and study the properties of carbon nanotubes using solution-based techniques. Representative results concerning the s…