Materials Literature
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Combined small-angle and high energy wide-angle X-ray scattering measurements of nanoparticle size and structure permit interior strain and disorder to be observed directly in the real-space pair distribution function (PDF). PDF analysis showed that samples of ZnS nanoparticles with similar mean diameters (3.2-3.6 nm)…
A novel method is presented to monitor carbon nanotube (CNT) growth by formation of CNT stacks. By this process, CNT growth kinetics are investigated for densely packed CNT films in the gas-diffusion-controlled regime. CNT stacks are fabricated by water-assisted selective etching and the cyclic introduction of ethylen…
2,5-Diphenyl-1,3,4-oxadiazole (OXD) derivatives with terminal ethynyl- (4a,b) and butadiynyl- (8a,b) substituents have been synthesized in high yields. 2-Methyl-3,5-hexadiyn-2-ol has not been exploited previously in the synthesis of terminal butadiynes. Crystals of 8a and 8b are remarkably stable to long-term storage…
We have synthesized an amphiphilic rigid-flexible macrocycle (fcoil = 0.68) consisting of hexa-p-phenylene and aliphatic polyether chain. The macrocyclic molecule in bulk state self-organizes into a 2-D body-centered rectangular structure (a = 4.3 nm and b = 6.3 nm). In aqueous solution, the macrocycle self-assembles…
We extend the concepts of phase, polarization, and feedback control of matter to develop a general approach for guiding light in the nanoscale via nanoparticle arrays. The phase and polarization of the excitation source are first introduced as tools for control over the pathway of light at array intersections. Genetic…
In recent years there has been considerable interest in using natural plant fibers as reinforcements for plastics. The motivation includes cost, performance enhancement, weight reduction, and environment concerns. High performance flax fiber could potentially substitute for glass or carbon fibers as reinforcements for…
Recent advances in in situ measurement technology and automation of batch crystallizers have enabled the development of batch crystallization recipes in which the desired supersaturation profile is followed by feedback control. This paper describes a new approach for following supersaturation setpoints for antisolvent…
A study based on two-dimensional percolation theory yielding quantitative parameters for optimum connectivity of transparent single-wall carbon nanotube (SWNT) thin films is reported. Optimum SWNT concentration in the filtrated solution was found to be 0.1 mg/L with a volume of 30 mL. Such parameters lead to SWNT frac…
The adsorption of CO(2) over a set of gallium (III) oxide polymorphs with different crystallographic phases (alpha, beta, and gamma) and surface areas (12-105 m(2) g(-1)) was studied by in situ infrared spectroscopy. On the bare surface of the activated gallias (i.e., partially dehydroxylated under O(2) and D(2) (H(2)…
Excitons in coupled quantum wells open the possibility to reach high densities close to equilibrium. In a recent experiment employing a lateral trap potential, a blue shift and a broadening of the exciton emission line has been seen (Snoke, SSC 134). The standard Hartree-Fock treatment can explain the blue shift but f…
The adsorption of proteins on poly(2-hydroxyethyl methacrylate) (PHEMA) brushes was systematically studied by quartz crystal microbalance (QCM) and fluorescence microscopy as a function of graft density and protein size. The graft density σ (chains/nm 2 ) ranged from 0.007 (dilute or semidilute brush regime) to 0.7 (c…
A simple chemical modification route to confer high hydrophobicity to crystalline cellulose surface was demonstrated using tunicin whiskers as model material. An alkyenyl succinic anhydride (ASA) aqueous emulsion was mixed with cellulose suspension, freeze-dried, and heated to 105 degrees C. The bulk degree of substit…
A facile method has been developed to prepare aqueous dispersions of encapsulated conjugated polymer nanoparticles exhibiting high fluorescence brightness. Salient features of the nanoparticles include their small diameter and spherical morphology. Encapsulation of the nanoparticles with a silica shell reduces the rat…
Compounds which possess 3D open-framework or 2D layered structures have been long been the subject of considerable interest due to the unique environment for reaction offered by their architechure. These compounds can undergo intercalation and/or chemie douce reactions that result in the incorporation of atoms or ions…
Owing to the exceedingly small intermolecular forces in perfluoropolymers, their solubility is dominated by entropy effects. Enthalpic interactions almost always decrease solubility because they tend to favor solvent-solvent mixing. Solution melting and crystallization temperatures have been observed to decrease with…
Lithium fluoride (LiF) nanowires with diameter of 100nm–500nm and length of tens of microns were synthesized via vapor-liquid-solid growth. Cubic-structured single-crystalline LiF nanowires grew along the ⟨001⟩ and ⟨110⟩ crystallographic directions, respectively. The growth of the LiF nanowires was proposed by the cat…
We report the first analysis of the soluble sub-proteome of the obligate thermophile, Geobacillus thermoleovorans T80, utilizing a robust multidimensional protein identification protocol. A total of 1,336 proteins were initially identified utilizing automated MS/MS identification software. Intensive manual curation re…
The conformational changes of carboxymethyl dextran (CMD) substrates induced by variations in pH and ionic strength were studied using surface plasmon field-enhanced fluorescence spectroscopy (SPFS). A typical response was an increase in swelling upon increasing the pH and decreasing the ionic strength. Furthermore, t…
The room temperature cation occupancy in LiMgVO(4) and LiZnVO(4) crystallographic sites is obtained by means of the combined use of X-ray powder diffraction (XRPD), (7)Li and (51)V magic angle spinning nuclear magnetic resonance (MAS NMR), and micro-Raman measurements. In the LiMgVO(4) Cmcm orthorhombic structure, the…
The infrared fluorescence and optical gain characteristics of optically transparent nanocomposites consisting of (THF)14Er10S6Se12I6 (“Er10”) or (DME)2Er(SC6F5)3 (“Er1”) clusters dissolved in a transparent hexafluoroisopropyl (6F) variant of a perfluorocyclobutyl (PFCB)-based fluoropolymer are reported. Under excitati…