Materials Literature
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Photocurrents in nanotube p-n junctions are calculated using a non-equilibrium Green function quantum transport formalism. The short-circuit photocurrent displays band-to-band transitions and photon-assisted tunneling, and has multiple sharp peaks in the infrared, visible, and ultraviolet ranges. The operation of such…
Femtosecond transient absorption measurements were carried out to investigate the scavenging effect, at low concentration, of the radiosensitizing molecule 5-bromo-2‘-deoxyuridine (BrdU) on presolvation states of the hydrated electron. Hydrated electrons were generated by two photon absorption of bulk water at 267 nm,…
X-ray studies on degummed B. mori silk fibers and on hydrogels prepared under a variety of conditions reveal moderately small angle reflections. These reflections are often highly oriented and are correlated to silk II lattice reflections. A superstructure can explain these features. Silk fibroin hydrogels were monito…
One reference tertiary amine and three families of structurally related trialkylamines and dendrimers have been synthesized, characterized, and studied by molecular dynamics simulations. The catalytic activity of these amines in the nitroaldol (Henry) reaction between 2-nitroethanol and benzaldehyde has been measured…
Amphiphilic bis(tetrathiafulvalene) [bis(TTF)] macrocycles with four alkyl chains were fabricated as novel electrically active Langmuir-Blodgett (LB) films. Two TTF units were linked via [24]crown-8, [21]crown-7, and [18]crown-6 macrocycles, forming charge-transfer (CT) salts with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyan…
Unless kinetically stabilized, hydroxides of silicon are unstable and readily self-condense through elimination of water molecules to yield Si−O−Si siloxane linkages. The condensation reaction is known to be very facile in the presence of acids and bases. Stabilization of three hydroxyl groups on the same silicon in a…
In this paper, we explore the impact of dietary deprivation, where spiders are provided diets missing one or more of the amino acids, on the properties of the spider dragline silk spun after one month on the diet. Cohorts of female N. clavipes spiders were selected for diets deprived of alanine (Ala) and glycine (Gly)…
Poly(lactic acid)s (PLA) were grafted to both ends of Pluronic F127 (PEO−PPO−PEO) to produce novel amphiphilic PLA−F127−PLA block copolymers. The hydrolytic degradation of PLA−F-127−PLA block copolymers in phosphate buffered saline (PBS) (pH 7.4) solution at 37 °C was studied using a combination of physical techniques…
The swelling behavior of alkanethiol-terminated poly(ethylene glycol) with an average molecular weight of 2180 Da (i.e., approximately 45 ethylene glycol, EG, units) in contact with water was investigated by neutron reflectometry as a function of the morphology of the PEG-SH layer. Amorphous films at a low grafting de…
Ion mobility and molecular modeling methods were used to examine the gas-phase structures of sodiated POSS capped with styryl and epoxy phenyl substituents (Na + Sty x Ep 8 - x T 8 ). Results were obtained for x = 5−7 and indicated that three distinct isomers with different collision cross-sections were present for ea…
The ternary alkali selenophosphates KPSe6 and RbPSe6 crystallize in the polar orthorhombic space group Pca2(1) with a = 11.7764(17) A, b = 6.8580(10) A, c = 11.4596(16) A, and Z = 4 for RbPSe6. CsPSe6 crystallizes in the monoclinic space group P2/n with a = 6.877(3) A, b = 12.713(4) A, c = 11.242(4) A, beta = 92.735(7…
Abstract The effects of clay on polymorphism of polypropylene (PP) in PP/clay nanocomposites (PPCNs) under various thermomechanical conditions were studied. In extruded PP and PPCN pellet samples, only α‐phase crystallites existed, as they were prepared by rapidly cooling the melt extrudates to room temperature. Under…
Using an interfacial polymerization technique, polyaniline (PANI) nanofibers are grown on Au electrodes which were pre-treated with a self-assembled monolayer (SAM) of 4-aminothiophenol (ATP). The ATP monolayer facilitates the growth of PANI nanofibers onto the Au surface to yield a durable polymer/metal interface. Th…
Addition of a benzyl substituent to the macrocyclic ring of DOTA has a substantial impact on the conformational ring flipping motion of the macrocycle in the resulting LnDOTA complexes. The p-NO2-benzyl substituent in the Ln(p-NO2-Bn-DOTA)- complexes lies in an equatorial position and effectively "locks" the conformat…
Syntheses, structures, and magnetic properties of two heterobridged mu-alkoxo-mu-7-azaindolate dicopper(II) complexes, [Cu(II)2(L-F)(mu-C7H5N2)] (1) and [Cu(II)2(L-H)(mu-C7H5N2)].CH3OH (2) (H3L-F = 1,3-bis(3-fluorosalicylideneamino)-2-propanol; H3L-H = 1,3-bis(salicylideneamino)-2-propanol) have been reported. Aside f…
Abstract This article investigates the effect of moisture on the dynamic mechanical behavior of polyamide‐6 (PA6)/clay nanocomposites with dynamic mechanical analysis from −130 to 110 °C. The storage moduli increase with the clay loading for dried and moisture‐absorbed samples because of the enhancing effect from the…
In this paper, we report the use of highly electrically conductive (400−1000 S/cm) polyaniline fibers for the development of electrochemical linear actuators. The high conductivity of the fibers ensures well-defined electroactivity and actuation without a metal backing. In propylene carbonate (PC), the electrochemical…
An unusual aggregation phenomenon that involves positively charged poly(L-lysine) (PLL) and negatively charged gold nanoparticles (Au NPs) is reported. Discrete, submicrometer-sized spherical aggregates are found to form immediately upon combining a PLL solution with gold sol (diameter approximately 14 nm). These PLL-…
Antitumor activity of linear, beta-cyclodextrin polymer (CDP)-camptothecin (CPT) conjugates (HGGG6, LGGG10, HG6, and HGGG10) is investigated in nude mice bearing human LS174T colon carcinoma tumors. These conjugates differ in polymer molecular mass [97 kDa (H) or 35 kDa (L)], CDP-CPT linker structure [glycine (G) or t…
Polymerization of 1,2-dithiane (DT) and the characterization of the polymer were investigated. Bulk polymerization of DT proceeded readily without initiators above the melting point of DT, giving a polymer in high yield. The polymerization of DT was strongly affected by the presence of small amounts of thiols. The mol…