Synthesis and Mesomorphic Properties of New Liquid Crystalline Dimesogens
Syntheses and mesomorphic properties of dimesogens incorporating dissimilar mesogenic units viz. cholesterol and substituted biphenyls are reported.
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Catalytic Chain Transfer Polymerization of Methyl Methacrylate in Supercritical Carbon Dioxide: Evidence for a Diffusion-Controlled Transfer Process
The mechanism of catalytic chain transfer polymerization with methyl methacrylate was studied in a range of media. The chain transfer reaction in supercritical CO 2 was found to be significantly enhanced compared with similar experiments in toluene or in bulk methyl methacrylate. The results are consistent with a diff…
Induced crystallinity during stretch–blow moulding process and its influence on mechanical strength of poly(ethylene terephthalate) bottles
Microstructural evolution in poly(ethylene terephthalate) during a stretch– blow process has an important influence on the final mechanical prop erties. To obtain information other than thickness distributions from numerical simulations of the blow moulding process, it is necessary to take into account the evolution o…
Ferroelectricity in Liquid Crystals
After summarizing ferroelectric and antiferroelectric liquid crystals (LCs) in liquid crystals so far discovered, two materials exhibiting a proper ferroelectricity are reported; (1) polar order in nematic LC of aromatic polyesters and (2) ferroelectric switching in a lyotropic liquid crystal of polypeptide. In the po…
Terephthaloyl Derivatives as New Gelators; Excellent Gelation Ability and Remarkable Increase of Gel Strength by Adding Polymers
Abstract New gelators based on benzenedicarboxylic acid were synthesized, and their gelation abilities were clarified. N,N′-Terephthaloyl-bis(l-valylaminooctadecane) was especially an excellent gelator to harden a wide variety of organic fluids. The strength of gel markedly increased with addition of commercially avai…
Study of the mechanical, thermal, and thermodegradative properties of virgin PP with recycled and non‐recycled HDPE
Abstract In order to show the significance of plastic recycling, a study of the properties of blends of PP with non‐recycled and recycled high density polyethylene (HDPE) is made. The results of the Young's modulus for polypropylene (PP)/non‐recycled and recycled HDPE blends present a slight synergism, although no sig…
Atomic displacements and defect accumulation during irradiation with energetic particles: An autobiographical review
We have been requested to prepare a rather unusual article for this special publication. The article should be not only autobiographical in nature but should also have historical perspectives and critique and should contain some element of visionary forecast. Undoubtedly, the idea is unique and challenging though may…
A TEM study of long-period mica polytypes: determination of the stacking sequence of oxybiotite by means of atomic resolution images and Periodic Intensity Distribution (PID)
In this study it is shown that the stacking sequences in long-period mica polytypes (including a rare example of a mixed-rotation polytype, with a 36-layer long periodicity) can be unambiguously determined using atomic resolution images recorded down two zone axes separated by 30 degrees (e.g. [100] and [31;0]) at the…
Direct and inverse electromechanical effect in ferroelectric liquid crystalline elastomers
Ferroelectric liquid crystalline elastomers (FLCEs) form a novel class of materials, in which the properties of macroscopically oriented ferroelectric liquid crystals can be combined with those of elastomers. The (direct and the inverse) piezoelectric effect in these systems is measured and analyzed on a molecular lev…
First-Row Transition-Metal Complexes of the 1-Methoxycyclobutenedionate(1−) Ion
The synthesis and characterization by single-crystal X-ray crystallography of a series of monomeric first-row transition-metal complexes with the 1-methoxycyclobutenedionate(1-) ligand are described. The isomorphous compounds [M(CH(3)OC(4)O(3))(2)(H(2)O)(4)] (M = Mn, Co, Ni, Zn) are C(2) symmetric and crystallize in t…
Effect of Fe doping on magnetic properties and magnetoresistance in La1.2Sr1.8Mn2O7
We report the effect of Fe doping on magnetic properties and magnetoresistance (MR) in the layered perovskite La1.2Sr1.8Mn2O7. Fe doping results in the weakening of ferromagnetic (FM) ordering, and the occurrence of a low-temperature spin-glass state in La1.2Sr1.8Mn2−xFexO7. Resistivity increases sharply with increasi…
Order-disorder process in the tetrahedral sites of albite
The crystal structure of albite from Stintino, Sardinia, Italy, was refined at different degrees of disorder to determine the (Si-Al) order-disorder process. Eight X-ray structure refinements were performed on single-crystal data collected at room temperature, after heating at 1050-1090 °C for 3 to 12 days. Average lo…
FTIR, XPS and TPR studies of N2O decomposition over Cu-ZSM-5
Decomposition of N2O on Cu-ZSM-5 was studied by temperature-programmed reaction (TPR), in situ Fourier transform infrared spectroscopy (FTIR) and XPS. It is found that the decomposed intermediates of N2O— dinitrogen and oxygen ion— show adsorption bands at 2161 cm−1 and 910 cm−1 in the IR spectrum, which can be assign…
Investigation of tetrahedral amorphous carbon films using x-ray photoelectron and Raman spectroscopy
Amorphous carbon containing very little hydrogen and having a highly tetrahedral structure has been prepared by the Filtered Cathodic Vacuum Arc (FCVA) technique under different deposition temperatures. Based on Raman measurement, it was found that the ID/IG intensity ratio, the G band peak position and the linewidth…
Periodic DFT Study of the Pt(111): A p(1×1) Atomic Oxygen Interaction with the Surface
The p(1×1) adsorption of atomic oxygen on the fcc and hcp three-fold hollow site of a Pt(111) surface has been investigated by a periodic slab model, varying the number of layers from two to four. The density functional method with local spin density approximation and with generalized gradient exchange−correlation fun…
Transport properties of crosslinked acrylonitrile butadiene rubber/poly(ethylene-co-vinyl acetate) blends
The diffusion and transport of organic solvents through crosslinked nitrile rubber/poly(ethylene-co-vinyl acetate) (NBR/EVA) blends have been studied. The diffusion of cyclohexanone through these blends was studied with special reference to blend composition, crosslinking systems, fillers, filler loading, and temperat…
Processing of β‐Silicon Nitride from Water‐Based alpha‐Silicon Nitride, Alumina, and Yttria Powder Suspensions
A water‐based route for processing ß‐Si 3 N 4 from alpha‐Si 3 N 4 , Al 2 O 3 , and Y 2 O 3 powder mixtures was established. The surface charges and isoelectric points of the three different powders were investigated within the pH range from pH 3 to pH 12. Citric acid diammonium salt was found to be an effective defloc…
Stress Corrosion Cracking of Sensitized Type 304 Stainless Steel in 288C Water: A Five Laboratory Round Robin
This chapter contains sections titled: Introduction Experimental Procedures Results And Discussion Conclusions
KINETICS OF OSMOTIC DEHYDRATION OF APPLES WITH PECTIN COATINGS
The solids gain and water loss during osmotic dehydration of coated apples were found to be dependend on concentration of pectin solution (0.5–4%) and drying time of coated apples (0–40 min). The coated apples were found to have generally a smaller the solids gain and higher or the same water loss than uncoated sample…
Biodegradable films from PHB-8HV copolymers and polyalcohols blends: crystallinity, dynamic mechanical analysis and tensile properties
Blends of poly(3-hydroxybutyrate)-poly(3-hydroxyvalerate) (PHB-HV) and polyalcohols have been prepared by solvent casting. The polyalcohols used were castor oil (CO) and polypropylene glycol (PPG400 and PPG1000). Thermal behaviour, crystallinity, morphology and dynamic mechanical properties of systems with various PPG…