Materials Literature
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Highly C‐axis oriented ZnO thin film was manufactured by radio‐frequency magnetron sputtering technique on Si (111) substrate. The main objective was to study the influence of rapid thermal annealing (RTA) temperature on the structure and interfacial characteristic of ZnO thin films. X‐ray diffraction results showed t…
Microwave absorbability of electromagnetic waves in the frequency range of 1–15 GHz, which is often used in recent wireless applications, for stacks of various numbers of conductive nonwoven fabric sheets with different resistivity was evaluated to clarify their possibility as the broadband microwave absorber in the f…
Abstract The intermolecular interaction is ubiquitous and influences the results of virtually every chemical or physical experiment. There are some important questions left in the theory of intermolecular interaction. One of such questions is: what kind of objects do interact. In the article, we recall a kind of unusu…
A fundamental T-branch in one-dimensional photonic crystal waveguides based on the omnidirectional reflection is constructed. Numerical simulations of this T-branch indicate that without any structural optimization, four high reflectance peaks and three high transmittance peaks appear alternately within a wide enough…
E-mail: opilkwon@ajou.ac.krReceived March 12, 2012, Accepted April 9, 2012Key Words : Metallopolymers, Layered mesophase, CarbazoleOrganic polymers with spatially ordered functional groupsoften exhibit enhanced physical properties compared toamorphous polymers with randomly orientated functionalgroups.
Abstract Fluorescence quenching of fluoranthene by maleic anhydride (MAH) in polypropylene (PP) during twin‐screw extrusion (TSE) was investigated using an online fluorescence measurement system. The fluorescence quenching effect was clearly seen from the decrease of the peak intensity and integrated area of the resid…
Landfills have been the most common form of waste disposal, and old landfills are present or in close proximity to most communities. Many old landfills, built before the environmental laws could properly regulating waste disposal, often not lined, are now considered potentially contaminated sites and can represent a s…
采用原位聚合和混炼插层相结合技术制备了氢化丁腈橡胶/聚甲基丙烯酸镁/有机蒙脱土(HNBR/PMgMA/OMT)纳米复合材料,通过XRD,SEM和TEM等测试方法研究了HNBR/PMgMA/OMT纳米复合材料的结构、形态和性能.PMgMA离子簇与未反应完全的MgMA单体形成纳米-微米共存形态结构,PMgMA对HNBR有显著的增强效果,HNBR/PMgMA/OMT纳米复合材料具有良好的加工性能、物理机械性能和耐介质老化性能.TEM结果显示MgMA/OMT并用有助于OMT剥离分散,有机蒙脱土在硫化胶中形成以剥离和插层为主、反插层和未插层共存的微观结构;SEM显示当MgMA/OMT用量为20/10份时能明显改善复合材料的界面结合,此时纳米…
Abstract Two new long-chain carboxylic acids (1, 2) bearing strong fluorescent group pyrene as ligands for Self-Assembled Monolayers (SAMs) have been synthesized. The multistep targeted synthesis is accomplished by use of Pyren-1-yl methylamine hydrochloride and employing simplified synthetic protocols. Compound 2 con…
Since ancient times, pure carbon materials have been familiar in human society—not only diamonds in jewellery and graphite in pencils, but also charcoal and coal which have been used for centuries as fuel for living and industry. Carbon fibers are stronger, tougher and lighter than steel and increase material efficien…
International audience
Abstract We have reported, from ab initio calculations, on the changes in the electronic and structural properties of short carbon atomic chains held rigidly between hydrogenated armchair graphene nanoribbons (AGNR) and zig‐zag graphene nanoribbons (ZGNR). Several lengths (N = 2–9 atoms) and forms of the chains have b…
We study tunneling phenomena at the edge of the anti-Pfaffian quantum Hall state at the filling factor $\nu=5/2$. The edge current in a single point-contact is considered. We focus on nonlinear behavior of two-terminal conductance with the increase in negative split-gate voltage. Expecting the appearance of the interm…
Ballistic Electron Emission Microscopy Study of Charge Transport Across an Au/Graphene-Oxide/Modified-Si Stack, Kajen, R. S., Chandrasekhar, N., Ng, Ming Hua, Goh, Seok Hong, Pey, Kin Leong, Vijila, C.
Abstract Morphosynthesis of poly[4‐(1,4‐phenylene)oxyphthalimide] (POPI) and poly[4‐(1,4‐phenylene)oxyphthalimide‐co‐4‐phthalimide] (POPI‐PPI) was examined by using the crystallization during the polymerization. The POPI fibrillar crystals were obtained as precipitates with the formation of spherical aggregates of pla…
采用固相法获得了Mn改性的Na 0.5 Bi 2.5 Nb 2 O 9 (NBN+ x mol%MnCO 3 , 0≤ x ≤10.0)铋层状压电陶瓷, 并系统地研究了Mn(掺杂)对NBN基陶瓷显微结构与电性能的影响. 结果表明, 所有获得的样品都是居里点在700℃以上的单一相铁电体. 加入Mn显著地提高了NBN系列陶瓷的机械品质因素 Q m , 明显改善了陶瓷的压电与机电性能. 当MnCO 3 掺杂量为8.0mol%时, 陶瓷获得最佳电性能: tan δ =0.749%, d 33 =20 pC/N, Q m =3120, k p =12.37%, k t =21.09%, P r =7.01 μC/cm 2 . NBN+ x…
Aqueous solution of oxygenated Direct yellow 12 dye has been evaluated spectrophotometrically as a possible gamma rays dosimeter. The neutral (pH-7), alkaline (pH-12.5) and acidic (pH-5.5) aqueous solution of the dye were prepared and exposed to various gamma doses. Absorption spectra of unirradiated and irradiated so…
We report on aging, rejuvenation and memory effects in the ferromagnetic phase of pure terbium. We have applied an experimental method specifically for investigating slow dynamics of spin glasses, because these effects cannot be interpreted as conventional diffusion after-effects. Results show that relaxation times of…
SERRS (surface-enhanced resonance Raman scattering) is a vibrational technique, whereby a relatively weak Raman scattering effect is enhanced through the use of a visible chromophore and a roughened metal surface. The direct analysis of DNA by SERRS requires the modification of a nucleic acid sequence to incorporate a…
Department of Chemistry, University of Toronto, Toronto, ONT, Canada M5S 3H6Received March 12, 2012, Accepted March 26, 2012Key Words : Copper(II) complex, Coordination polymer, Crystal structure, HexaazamacrocycleCoordination polymers have been received considerableinterest due to their interesting structural aspects…