Materials Literature
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We demonstrate a new method that makes use of colloidal silica templates to fabricate porous three-dimensional architectures of carbon nanotubes (CNTs). CNTs were grown on monolayered and multilayered structures of colloidal silica using chemical vapor deposition. Porous CNT membranes and three-dimensional carbon nano…
Nonwoven structures have a range of applications which include geotextiles, interlinings, carpet backing and as reinforcements in composites. In this study, the tensile behavior of nonwoven structures including needlepunched and thermal bonded has been predicted by modifying the micromechanical model based upon the ge…
The ageing dynamics of a charged colloidal system, Laponite suspended in water, have been investigated by photon correlation technique. The samples covered a novel and very wide range of clay concentrations (C w = 0.3–3.1 wt%) and four different NaCl concentrations (C s = 1 × 10−4 M, 1 × 10−3 M, 2 × 10−3 M and 5 × 10−…
Material size effects are predicted for idealized planar micromanufactured structures, as a consequence of the competitive contributions of strain gradient strengthening and loss of microstructural constraints with diminishing dimensions, assuming a constant grain size. Simulations are carried out using a three-dimens…
Following an introduction to the nanocluster stabilization literature and DLVO (Derjaugin-Landau-Verwey-Overbeek) theory of colloidal stability, the most common steric stabilizer of transition-metal nanoclusters, poly(vinylpyrrolidone) (PVP), has been examined for its efficacy in the formation, stabilization, and subs…
A biomaterial and its potential degradation products should be biocompatible, nontoxic, and removed by the body upon expiration of its functional lifetime. One historically successful approach is to create new materials from biomolecules that naturally occur in the human body. Herein, we report the synthesis and chara…
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Helical wheel projections of peptides based on the repeating unit Ac-(AAKA)n-NH2 clearly illustrate an amphipathic nature. One should therefore expect these peptides to form helices if the number of residues exceeds a certain threshold value. Indeed, ECD measurements show that Ac-(AAKA)4-NH2 and, to a minor extent, al…
Abstract Summary: Shear‐induced crystallization in a blend of isotactic poly(propylene) and poly(ethylene‐ co ‐octene) (iPP/PEOc) has been investigated by means of in‐situ optical microscopy and a shear hot stage under various thermal and shear histories. Cylindrites are observed after shear in the phase‐separated iPP…
In this study, the soft embossing method is proposed to fabricate periodical microgrooved structure on polyimide surfaces. These microgrooved polyimide surfaces are assembled to form liquid-crystal cells. It is found that the director of liquid crystals uniformly aligns along the groove direction even when the groove…
Novel highly soluble addition-type imide oligomers were synthesized from 2,3,3′,4′-biphenyltetracarboxylic dianhydride (a-BPDA), 9,9-bis(4-aminophenyl)fluorene (BAFL), 4,4′-diaminodiphenyl ether (4,4′-ODA), and 4-phenylethynylphthalic anhydride (PEPA) to fabricate carbon fiber-reinforced plastics (CFRP) by routing imi…
Abstract Summary: With the proper selection of shear and thermal conditions, super‐hydrophobic polymeric surfaces (contact angle > 150°) with tunable sliding angles (from less than 1° to higher than 90°) can be prepared from pure isotactic poly(propylene) (iPP) without any further modification with low‐surface‐ener…
We present a theoretical study of the phase behavior of mixed brushes composed of charged and noncharged polymers that are mutually incompatible. We derive the self-consistent-field (SCF) equations from the canonical ensemble for a system of polyelectrolyte and uncharged polymers with added salt. Within the saddle poi…
Abstract Structure, thermal properties, and influence of layered double hydroxide (LDH) fillers on photocrosslinking behavior of high‐density polyethylene (HDPE)/LDH nanocomposites have been studied in the present article. The X‐ray diffraction and transmission electron microscopy analysis demonstrate that the complet…
The aliphatic anthracene compound 1 and the oligomeric anthracene 2 were synthesized. Thin films of 1 and 2 mixed with the sensitizers tetraphenylporphyrin (TPP) and methylene blue (MB) were irradiated with visible light in air. Upon formation of singlet oxygen, the anthracene units were converted quantitatively to th…
Ordered mesoporous Fe2O3 was synthesized using cetyltrimethylammonium chloride (CTAC) and polyethylene glycol octadecyl ether (Brij 76) surfactant templates. The gel time was monitored as a function of the concentration ratio of precursor to the surfactant. As-prepared FeOOH gels were extracted in ethanol to remove th…
Structural aspects of clustering of rare earth ions in oxide glasses have been studied for the last several years in relation to their applications in photonics. However, the mechanism of homogenization of the spatial distribution of rare earth ions by codoping, typically with Al or P, is still not well understood. In…
Abstract Summary: The atom transfer radical polymerization of [2‐(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) has been studied under different [Cu I ]/[Cu II ] ratios. The reaction kinetics is followed by ellipsometry and quartz crystal microbalance and it was found that the reaction speed influences the…
Abstract Summary: The formation of a molecular‐complex crystalline phase of syndiotactic polystyrene (sPS) that contains a stable nitroxide radical compound, 2,2,6,6‐tetramethylpiperidinyl‐ N ‐oxyl (TEMPO), is confirmed by IR and electron spin resonance (ESR) spectroscopy, X‐ray diffractometry, and thermogravimetric a…
We have established experimental strategies on how to create a Menger sponge-like fractal body and how to control its fractal dimension. The essence was to utilize alkylketene dimer (AKD), which spontaneously forms super-water-repellent fractal surface. We prepared "fractal AKD particles" with fractal surface structur…