Materials Literature
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We report the synthesis of a series of poly(p-phenylene ethynylene)s (PPEs) with high ionization potentials and associated high excited-state electron affinities. Their photophysical properties were investigated using steady-state and time-resolved fluorescence techniques. The ionization potentials of the polymer thin…
Principles of Brazing serves as a problem-solving guide for anyone who works with brazing processes or designs component joints. It covers key brazing parameters such as surface energy and tension, wetting and contact angle, and filler spreading characteristics; design considerations including mechanical integrity and…
Tetrapod zinc oxide (T-ZnO) nanorods have been synthesized by evaporation and recondensation of metallic Zn under ambient conditions. The total sizes of the T-ZnO nanostructures range from 300nmto15μm with leg diameters of about 30to650nm, depending on the deposition temperature. A detailed high-resolution electron mi…
We describe an exciting opportunity for affinity biosensing using a ratiometric approach to the angular-dependent light scattering from bioactivated and subsequently aggregated noble metal colloids. This new model sensing platform utilizes the changes in particle scattering from very small colloids, which scatter ligh…
Abstract The oxorhenium(V) chelates [ReOCl(N,O‐L)(PPh 3 )] [N,O‐L=( O CH 2 CH 2 ) N (CH 2 CH 2 OH)(CH 2 CO O ) ( 2 ), ( O CH 2 CH 2 ) N (CH 2 CO O )(CH 2 COOCH 3 ) ( 3 )] and [ReOCl 2 (N,O‐L)(PPh 3 )] [N,O‐L=C 5 H 4 N (CO O ‐2) ( 4 ) C 5 H 3 N (COOCH 3 ‐2)(CO O ‐6) ( 5 )] have been prepared by reaction of [ReOCl 3 (PP…
Typical liquidus temperatures can be over 1000°C greater than the glass transition temperatures for high-pressure aluminosilicate melts so the effect of temperature must be determined if glass data is to be used to approximate the structural speciation present in geologic melts. This study has investigated the effect…
ABSTRACT Water barrier and mechanical properties were measured for soy protein isolate (SPI) films plasticized with glycerol (GLY) and 1 of the plasticizers (propylene glycol [PG], polyethylene glycol [PEG], sorbitol [SOR], or sucrose [SUC]) at a ratio of 25:75, 50:50, 75:25, and 0:100. Plasticizer type as well as the…
The effects of the chemical functionalization of a single-wall carbon nanotube in nanotube/polyethylene compos-ites on the bulk elastic properties are presented. Constitutive equations are established for composites containing both functionalized and nonfunctionalized nanotubes using an equivalent-continuum modeling t…
Mechanics and Mechanisms of Fracture: An Introduction concerns itself with the fracture behavior of engineering materials and the tools one can use to account for it when analyzing designs and investigating failures. The book begins with a review of stress analysis and its application in progressively more realistic s…
This study was undertaken to evaluate the feasibility of using chitosan, a natural antimicrobial substance, to improve the preservation of a very perishable cheese. The effectiveness of chitosan to inhibit the growth of spoilage microorganisms in Mozzarella cheese was studied during refrigerated storage. A lactic acid…
Nucleolipids are hybrid molecules composed of a nucleobase, a nucleoside, a nucleotide or an oligonucleotide (either DNA or RNA), and a lipophilic moiety, which might be either simply a single- or double-chained alkyl (or alkenyl) moiety or a carbocyclic hydrocarbon such as cholesterol, a vitamin, or a bile acid. This…
An approach to fabricate ferromagnetic∕polymer composite nanotubes has been developed. The surfaces of the pores in self-ordered porous alumina membranes are wetted with a polystyrene or poly-l-lactide layer containing a metallo-organic precursor. Decomposition of the precursor leads to the formation of thin-walled ma…
A novel method is developed to enable the formation, positioning, and patterning of individual metal nanoclusters with controllable and monodispersed sizes down to 1-2 nm scale. The method is generic for fabricating designed arrays of virtually any type of metal nanoparticles well below 10 nm. Among the wide range of…
Measurements of the high-pressure compressive strength are presented for several aluminum alloys shocked to 22GPa. Five well-characterized aluminum materials were studied, including 6061 alloy with three average grain sizes (50, 30, and <5μm), pure aluminum 1060 (99.5% Al) with a 180-μm grain size, and ultrapur…
Elucidating the chemisorption properties of CO on gold clusters is essential to understanding the catalytic mechanisms of gold nanoparticles. Gold hexamer Au(6) is a highly stable cluster, known to possess a D(3)(h) triangular ground state structure with an extremely large HOMO-LUMO gap. Here we report a photoelectron…
Metal–ferroelectric–insulator–semiconductor (MFIS) diodes and p-channel MFIS field-effect transistors (FETs) were fabricated and their electrical properties were characterized. These MFIS structures were formed using HfO 2 as an insulating buffer layer, and SrBi 2 Ta 2 O 9 (SBT) and (Bi,La) 4 Ti 3 O 12 (BLT) as ferroe…
The exciton binding energy serves as a critical criterion for identification of the nature of elementary excitations (neutral excitons versus a pair of charged carriers) in semiconductor materials. An exciton binding energy of 0.41 eV is determined experimentally for a selected nanotube type, the (8,3) tube, confirmin…
Methanol catalysis meets chemistry under confined conditions. Methanol is regarded as one of the most important future energy sources. ZnO/Cu composite materials are very effective in heterogeneous catalysis for methanol production due to the so-called strong metal-support interaction effect (SMSI). Therefore, materia…
We compare theoretical and simulation results for static and dynamic properties for a model of particles interacting via a spherically symmetric repulsive ramp potential. The model displays anomalies similar to those found in liquid water, namely, expansion upon cooling and an increase of diffusivity upon compression.…
Despite the recent progress toward the synthesis of monodisperse semiconducting nanocrystals, it remains a challenge to prepare quantum dot structures with a precise number of atoms. Here, we report synthesis, crystal structure, and optical properties of a family of cadmium sulfide nanocrystal superlattices assembled…