Comment on “Examination of Spinel and Nonspinel Structural Models for γ-Al2O3by DFT and Rietveld Refinement Simulations”
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Aggregation of the Amphipathic Peptides (AAKA)ninto Antiparallel β-Sheets
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…
Shear‐Induced Crystallization in a Blend of Isotactic Poly(propylene) and Poly(ethylene‐co‐octene)
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…
Pretilt Angle of Liquid Crystals and Liquid-Crystal Alignment on Microgrooved Polyimide Surfaces Fabricated by Soft Embossing Method
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…
Development of Highly Soluble Addition-type Imide Oligomers for Matrix of Carbon Fiber Composite (I): Imide Oligomers Based on Asymmetric Biphenyltetracarboxylic Dianhydride and 9,9-Bis(4-aminophenyl) fluorene
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…
Shear‐Controlled Micro/Nanometer‐Scaled Super‐Hydrophobic Surfaces with Tunable Sliding Angles from Single Component Isotactic Poly(propylene)
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…
Self-Consistent-Field Analysis of Mixed Polyelectrolyte and Neutral Polymer Brushes
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…
Structure, thermal stability, and photocrosslinking characterization of HDPE/LDH nanocomposites synthesized by melt‐intercalation
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…
Imaging by Sensitized Oxygenations of Photochromic Anthracene Films: Examination of Effects That Improve Performance and Reversibility
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…
Nanoenergetic Composite of Mesoporous Iron Oxide and Aluminum Nanoparticles
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…
Direct spectroscopic observation of the atomic-scale mechanisms of clustering and homogenization of rare-earth dopant ions in vitreous silica
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…
The Effect of [CuI]/[CuII] Ratio on the Kinetics and Conformation of Polyelectrolyte Brushes by Atom Transfer Radical Polymerization
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…
Molecular‐Complex Formation of Syndiotactic Polystyrene with Stable Radical Molecules
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…
Menger sponge-like fractal body created by a novel template method
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…
Effect of Peptide Ligand Dipole Moments on the Redox Potentials of Au38 and Au140 Nanoparticles
Phenylethanethiolate monolayer-protected Au38 and Au140 nanoclusters were modified by ligand place exchange with a series of thiolated peptides. The peptides were homooligomers based on the alpha-aminoisobutyiric acid unit. The effects of changing the peptide concentration and the peptide length in the capping monolay…
Bonding nature of metal/oxide incoherent interfaces by first-principles calculations
A bonding mechanism of large-mismatched metal/oxide heterointerfaces, classified as incoherent interfaces, is investigated by first-principles calculations. As a model system, incoherent $\mathrm{Ni}∕\mathrm{Zr}{\mathrm{O}}_{2}(111)$ interfaces are selected, and the interfacial bonding characters and their relevance t…
Synthesis of novel boron‐containing epoxy–novolac resins and properties of cured products
Abstract Epoxy–novolac resins were synthesized by modifying a commercial novolac resin with epichlorohydrin. These epoxy–novolac resins were characterized and further modified with different contents of bis(benzo‐1,3,2‐dioxa‐borolanyl)oxide or bis(4,4,5,5‐tetramethyl‐1,3,2‐dioxa‐borolanyl)oxide. The boron‐containing e…
Dislocation transport using an explicit Galerkin/least-squares formulation
An explicit Galerkin/least-squares formulation is introduced for a quasilinear transport equation in field dislocation mechanics (FDM) and applied to the study of the kinematics of dislocation density evolution in the following physical contexts: annihilation of dislocations, expansion of a polygonal dislocation loop…
Surface Functionalization of Fe3O4 Magnetic Nanoparticles via RAFT‐Mediated Graft Polymerization
Abstract Summary: Surface functionalization of Fe 3 O 4 magnetic nanoparticles (MNP) via living radical graft polymerization with styrene and acrylic acid (AAc) in the reversible addition‐fragmentation chain transfer (RAFT)‐mediated process was reported. Peroxides and hydroperoxides generated on the surface of Fe 3 O…
Multiwalled Carbon Nanotubes Functionalized by Hyperbranched Poly(urea‐urethane)s by a One‐Pot Polycondensation
Abstract Summary: Hyperbranched poly(urea‐urethane)‐functionalized multiwalled carbon nanotubes (MWNT‐HPUs) have been synthesized by a one‐pot polycondensation of tolylene 2,4‐diisocyanate and diethanolamine in the presence of MWNTs terminated with multiple hydroxy groups. FT‐IR, Raman, 1 H NMR, and 13 C NMR spectra r…