Materials Literature
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The shear response of polymer brushes is explored as a function of grafting surface curvature using the Alexander−deGennes ansatz, where the free ends of the chains are localized at the tip of the brush and all tethered chains in the brush are stretched equally. Brushes adsorbed onto the concave and convex surfaces of…
Changes in shape of internally pressurized tubes caused by operating temperatures and pressures are enhanced by fast neutron irradiation. Lengths and diameters of Zr-2.5Nb pressure tubes in CANada Deuterium Uranium-Pressurized Heavy Water (CANDU-PHW) power reactors and test reactors have been monitored periodically ov…
Electron radiation induced hydrocarbon contamination can be either a problem or a useful tool in electron beam analyses and lithographies. We have used atomic force microscopy to study electron beam written contamination structures. Contamination is shown not only to arise from the primary electron beam but also from…
(Tetraphenylporphyrinato)zinc(II) covalently linked with pyridine at the ortho position of one of the four phenyl rings exists as a stable pentacoordinated complex while a temperature dependent “tail-on” and “tail-off” binding mechanism is operative for the meta-substituted derivative. The axially bound pyridine does…
Streptomyces griseus produced a certain kind of flocculating substance(s). The flocculating substance(s) could aggregate suspended kaolin particles in solution to form small floes and enables it to sediment those particles. The production of flocculating substance(s) by S. griseus was not parallel to the cell growth a…
Solid state 13 C CP/MAS studies of poly(vinyl chloride) (PVC)−bis(2-ethylhexyl) phthalate (DOP) have been carried out to elucidate the dynamics of polymer−plasticizer interaction at the molecular level. 13 C NMR spectra, spin−lattice relaxation time T 1 (C) and spin−spin relaxation time T 2 (C) were obtained for vario…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Specimen Thickness on Crystallization RateJ. M. SchultzView Author Information Materials Science Program, University of Delaware, Newark, Delaware 19716Cite this: Macromolecules 1996, 29, 8, 3022–3024Publication Date (Web):April 8, 1996Publication History Received15 M…
Thermal conductivity of sintered silicon nitride has been improved by grain growth of β-Si3N4. β-Si3N4 containing 0.5mol% Y2O3 and 0.5mol% Nd2O3 was gas-pressure sintered at 1973 to 2473K and the microstructures and the thermal conductivities were investigated. The materials sintered at temperatures higher than 2173K…
This study examines the relationship between polymer surface conformation and colloid stability using single-stranded DNA as a model polymer and a biochemical technique called hydroxyl radical footprinting (HRF). The DNA polymer (dT40B) has a diblock copolymer architecture with an uncharged and relatively hydrophobic…
This work describes the effect of the addition of EPDM to polypropylene on the mechanical performance of EPDM/PP blends prepared in different composition ranges and mixing conditions, and evaluates the effect on the mechanical properties when controlled degraded polypropylene is added to these blends as a third compon…
Keggin-type heteropolyacids (water-soluble H 3 PMo 12 O 40, H 4 PMo 11 VO 40, and H 8 PMo 10 VCuO 40 and water-insoluble K 3 PMo 12 O 40 and H 3 - x Cs x PMo 12 O 40, x = 1, 2, 2.5, 3) deposited on highly oriented pyrolytic graphite (HOPG) surfaces were successfully imaged by scanning tunneling microscopy (STM). All o…
The esterification of aqueous lactic acid solution with methanol and its reverse reaction catalyzed by acidic cation exchange resins in the H+ form were carried out in a batch system. The inhibiting effects of water and methanol on the resins were evaluated. The experimental data were correlated by a kinetic model tha…
The thiazole orange derivative, TO-PRO-3, and its dimeric analogue, TOTO-3, bind strongly to both double- and single-stranded DNA. Both the bound and the free dye undergo efficient nonphotochemical hole burning. From the structure of the hole burned and the fluorescence line-narrowed spectra, it is concluded that ther…
Crack growth in silica optical fibers was measured directly in a wide range of crack velocities d a/ d t (10 −13 < d a /d t < 10 −5 m/s) by improving our previous method. The slope in log‐log plots of the crack velocity versus the stress intensity factor data was revealed to increase with the crack velocity, e.g…
Advanced ceramic materials can be synthesized and processed using a large variety of different techniques. Synthesis and processing methods of oxide and non-oxide ceramic materials is reviewed with emphasis on solution techniques and high-temperature gas phase and condensed phase syntheses. Net-shape methods such as c…
The reaction between salicylaldehyde, diethylenetriamine and lanthanide(III)(Ln3+) nitrates in refluxing methanol produced new acyclic dimeric Schiff-base compounds [{LnL7(NO3)}2](H2L7 is the 2 : 1 Schiff-base condensation product of salicylaldehyde and diethylenetriamine) in which the coupled Ln3+ ions are bridged by…
The dark‐field diffraction contrast of helical nanotubes (NTs) is shown to be asymmetric when an NT is tilted at appropriate angle with respect to the incident electron beam. This phenomenon was used for the chirality determination of multi‐shell NTs observed in MoS 2 layered compound. Both kinds of NT — helical and n…
The mechanisms of the molecular and dissociative adsorption of formic acid HCOOH on a ZnO(101̄0) surface were investigated by means of the ab initio molecular orbital method using a Zn 4 O 4 cluster embedded in an electrostatic field represented by 464 point charges at the crystal ZnO lattice positions. cis -Formic ac…
Stress, strain, and optical birefringence were measured for cross-linked natural rubber in compression and tension over a range of strains. The experimental data were compared to the constrained-junction theory (Flory, P. J.; Erman, B. Macromolecules 1982, 15, 800) and to the constrained-chain theory (Kloczkowski, A.;…
The phase behavior in ternary blends of polystyrene (PS), poly(methyl methacrylate) (PMMA), and poly(styrene- co -methyl methacrylate) has been determined as a function of sequence distribution at 150 °C. Two copolymers were investigated which have comparable compositions (48−50 mol % methyl methacrylate monomer units…