Materials Literature
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Liquid foams can behave like solids or liquids, depending on the applied stress and on the experimental timescale. Understanding the origin of this complex rheology which gives rise to many applications and which resembles that of many other forms of soft condensed matter made of closely packed soft units requires cha…
Polycationic polymers are used extensively in biology to disrupt cell membranes and thus enhance the transport of materials into the cell. The highly polydisperse nature of many of these materials makes obtaining a mechanistic understanding of the disruption processes difficult. To design an effective mechanistic stud…
Semiconducting single-walled carbon nanotubes are studied in the diffusive transport regime. The peak mobility is found to scale with the square of the nanotube diameter and inversely with temperature. The maximum conductance, corrected for the contacts, is linear in the diameter and inverse temperature. These results…
The chapters in this volume are representative of the contributions presented at a symposium, New Polymeric Materials held in Capri, Italy, October 22-25, 2003 on the occasion of the 70th birthday of Frank E. Karasz.
The anodic behavior of nickel in Na2B4O7 solutions containing various concentrations of NaCl, NaBr, or NaI as pitting corrosion agents was studied using the potentiodynamic technique. In absence of the halide anions, the E/i curves exhibit active and passive regions prior to oxygen evolution. The passivity is due to t…
The transmetalation reaction between a sacrificial nanoparticle and more noble metal ions in solution has emerged as a novel method for creating unique hollow and bimetallic nanostructures. In this report, we investigate the possibility of carrying out the transmetalation reaction between hydrophobic silver nanopartic…
The magnetic behavior of epitaxial La0.7Ca0.3MnO3 (LCMO) films grown on SrTiO3, with thickness down to 2.4nm, has been analyzed and correlated to the magnetoresistance (MR). Below about 10nm the canonical ferromagnetic order switches to a distribution of superparamagnetic clusters. These ultrathin films show a huge MR…
Abstract Blends of polyamide‐6 with 5, 7.5, 10, 15, and 20 wt % of polyvinyl alcohol (PVA) were prepared by the extruding in a corotating twin‐screw extruder. The extrudate strands were cut into pellets and injection‐molded to make test specimens. These specimens were tested for physico‐mechanical properties such as t…
[reaction: see text] The photochemical conversion of 9,10-deoxytridachione to photodeoxytridachione has been photosensitized. The conversion was also quenched by piperylene. Photodeoxytridachione was produced in good yields under conditions in which only the cyclohexadiene group is sensitized. The results show that so…
Functional properties of the amino polysaccharides, chitin and chitosan, vary significantly with their acetyl content. The acid hydrolysis-HPLC method offers good accuracy and precision to assay the acetyl content regardless of the solubility of the sample. In this research, the hydrolysis parameters were changed, and…
A novel fabrication of the chemically and topologically heterogeneous patterns on the surface of polymeric films over an area of more than 1 square centimeter in a single step was demonstrated by using the self-organizing character of polystyrene-b-oligothiophene block copolymers. Hexagonally arranged open pores of a…
This chapter reviews the research on morphology development in polymer blends and describes the different experimental methodologies used to determine blend morphology in three different types of polymer processing equipment: twin screw extruder, single-screw extruder, and twin rotor batch mixer. It describes some min…
Molecular dynamics simulations are performed on parallel computers to investigate the crystalline $\mathrm{Si}(111)∕{\mathrm{Si}}_{3}{\mathrm{N}}_{4}(0001)$ interface that is modeled as an eight-component system. The average total energy per particle and the average kinetic energy per particle of the subsystems are mo…
The photophysical properties of a series of triply bridged [3.3.n](3,6,9)carbazolophanes ([3.3.n]Cz, n = 3, 4, 5, 6) were studied as a model compound for a fully overlapped carbazole excimer. In these [3.3.n]Cz molecules, a plane angle of the two carbazole moieties changed systematically from nearly parallel to obliqu…
A series of luminescent sol−gel-encapsulated Ru(bpy) 3 Cl 2 ·6H 2 O and EuCl 3 ·6H 2 O mixtures with Zn(NO 3 ) 2 ·6H 2 O were assembled and characterized in terms of their steady-state and time-dependent photophysical properties. UV−vis absorption, steady-state emission, and FT-IR spectra were measured for the materia…
Abstract A new interesting category of organometallic polyketones and copolyketones was synthesized via Friedel–Crafts reactions through the polymerization of 2,7‐bis[(2‐ferrocenyl)methylene] cycloheptanone ( II ) with different diacid chlorides. The model compound was synthesized by reacting monomer II with benzoyl c…
Three heteroleptic tris(phathlocyaninato) dysprosium triple-decker complexes with different alkoxy groups at the peripheral positions of the medium phthalocyanine ligand (Pc)Dy[Pc(OCnH(2n+1))8]Dy(Pc) (n = 4, 8, 16) (I-III) {Pc = unsubstituted phthalocyaninate; Pc(OC4H9)8 = 2,3,9,10,16,17,23,24-octakis(butyloxy)phthalo…
13C high-resolution solid-state NMR coupled with selective 13C isotope-labeling of different Ala one methyl carbons was used to clarify the structure of (AG)15 peptide in the silk II structure as a model for the crystalline domain of Bombyx mori silk fiber. At the inner part of the peptide, the fraction of the peak at…
Soil carbonate‐C is a large pool of C and, in desert environments, is the dominant type of C stored in soil. To more fully understand the global C cycle and the role of soil in C sequestration, it is important to recognize how C enters and leaves the carbonate pool, as well as identify the forms of carbonate that exis…
The phase transition of 1:1 mixed-stack organic charge-transfer crystal of tetrathiafulvalene-$p$-bromanil (TTF-BA) has been investigated by high resolution x-ray diffraction. The temperature-induced phase transition to a nonmagnetic state at 53 K was characterized by a dimeric distortion of the donor-acceptor stack s…