Materials Literature
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In this work we have explored capillary adhesion between hair fibers treated with different types of oils. With coconut, olive, and sunflower oils the capillary adhesion was found to decrease with time, but not with mineral oil. Application of heat reduced the capillary adhesion further for coconut and sunflower oils.…
The well-known influence of long perfluorinated chains on the structures and stability of amphiphilic molecules in liquid crystalline mesophases or mesoscopic micellar arrangements is evaluated here in the realm of crystalline materials based on rigid aromatic molecules bearing only a limited number of CF(3) moieties.…
Abstract Maleic anhydride (MA) and dicumyl peroxide (DCP) were used as crosslinking agent and initiator respectively for blending starch and a biodegradable synthetic aliphatic polyester using reactive extrusion. Blends were characterized using dynamic mechanical and thermal analysis (DMTA). Optical micrographs of the…
Abstract Direct melt compounding was used to prepare nanocomposites of organophilic montmorillonite (o‐mmt) clay dispersed in maleated polypropylenes (PPgMA) as well as nanocomposites of organoclay and polypropylene (PP) modified with various grades of PPgMA compatibilizers. The thermal effect on the rheology and melt…
Abstract It is usually reported that wood particles in wood/polymer composite foams can act as nucleating sites. Since high wood contents are used, it is difficult to determine exactly the effect of wood particles. In this study, LDPE was chemically foamed in a twin‐screw extruder, and small amounts of wood (0–5 phr)…
Molecular dynamics simulations of the n-alkanes C18H38, C19H40, and C20H42 are reported for temperatures just below the melting point. Besides thermodynamic and average structural data for the ordered phase, we discuss the molecular motions initiating the rotator phases observed in spontaneous phase transitions in iso…
Interactive, strong interbonding and highly electron conductive nonstoichiometric titanium suboxide catalytic supports, Magneli phases (Ti(n)O(2n-1), on average Ti(4)O(7)), have been used in the electrocatalysis of hydrogen (HELR) and oxygen (OELR) electrode reactions with remarkable consequences and advanced achievem…
Water soluble alpha-helical polypeptides were used to prepare silica coated hexagonal single crystal platelets in concentrated solutions. To our knowledge, there is no other instance where polymer single crystals, typically formed under high dilution, can be grown in a bulk material. This unprecedented self-assembly p…
At 300 K ultrafine $\ensuremath{\sim}6\text{ }\text{ }\mathrm{nm}$ grain-size nanoanatase retains its structural integrity up to 18 GPa. There is progressive pressure-induced structural disorder to a highly disordered state at $P>18\text{ }\text{ }\mathrm{GPa}$. Signatures of short-range order persist to well beyon…
High resolution neutron powder diffraction has been applied to verify the model of distorted cycloidal magnetic modulation proposed on the basis of NMR studies of the multiferroic BiFeO 3 in Zalesskii et al (2000 Europhys. Lett. 50 547). Our experimental results do not support the model of magnetic modulation given by…
Abstract In this study, the novel halogen‐free flame retardants (PSiN, A and B), which contain phosphorus, nitrogen, and silicon, have been synthesized. The structure of PSiN‐A is characterized by fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and its thermal property is studied through…
We present evidence of magnetic order in the quasi-one-dimensional spin-1/2 molecular chain compound, copper pyrazine dinitrate $\mathrm{Cu}({\mathrm{C}}_{4}{\mathrm{H}}_{4}{\mathrm{N}}_{2}){(\mathrm{N}{\mathrm{O}}_{3})}_{2}$. Zero field muon-spin relaxation measurements made at dilution refrigerator temperatures show…
The nature of the thermochromic form of overcrowded bistricyclic aromatic enes (BAEs) has been controversial for a century. We report the single-crystal X-ray structure analysis of the deep-purple and yellow polymorphs of 9-(2,7-dimethyl-9H-fluoren-9-ylidene)-9H-xanthene (11), which revealed the molecules in a twisted…
Horseradish peroxide (HRP) was covalently coupled to three-dimensional (3D) silk fibroin scaffolds using water-soluble carbodiimide. Stable, bilaterally symmetrical immobilized HRP gradient patterns were generated within 3D silk fibroin scaffolds using the principles of diffusion. Gradients of immobilized HRP activity…
A novel titanium-substituted silicotungstate cluster of [{gamma-SiTi2W10O36(OH)2}2(mu-O)2]8- (1) is synthesized by the introduction of titanium(IV) ions into a divacant lacunary gamma-Keggin-type silicotungstate of [gamma-SiW10O36]8-. This titanium-substituted polyoxometalate, 1, exhibits a dimeric structure. One half…
Fishing of graphitic nanotubes with a macroscopic glass hook: A ∼30 mm long fiber (see figure and cover) is readily processed from a suspension of self-assembled nanotubes with one-handed helical chirality, formed from the (R)- or (S)-enantiomer of chiral amphiphile 2. The majority of the nanotubes in the fiber are un…
Abstract The anionic epoxy homopolymerization initiated by tertiary amines, imidazoles, and ammonium salts is a complex reaction exhibiting two undesired characteristics for practical applications: (a) slow reaction rates with long induction periods, and (b) short primary chains due to the high rate of chain transfer…
Imperative irradiation: A large enantiomeric excess in a liquid-crystal phase can be induced by circularly polarized light (CPL) as an external stimulus, and an imbalance in the two chiral domains becomes remarkable in the BX phase (see pictures), which is similar to the B4 phase made up by classical bent-core mesogen…
For the first time, we observed photoluminescence in Eu(III) dithiocarbamate complexes at room temperature -- more specifically in [Eu(Et(2)NCS(2))(3)phen], [Eu(Et(2)NCS(2))(3)bpy] and the novel [Eu(Ph(2)NCS(2))(3)phen], where phen stands for 1,10-phenanthroline and bpy for 2,2'-bipyridine. Correlations between the el…
Temperature-dependent X-ray diffraction and infrared (IR) spectra were measured for poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate- co -3-hydroxyhexanoate) P(HB- co -HHx) (HHx = 2.5, 3.4, 10.5, and 12 mol %) to explore their crystal and lamella structure and the C−H···O C hydrogen bonding in them. The X-ray…