Materials Literature
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We have investigated a surfactant-assisted sonochemical approach to produce monodisperse <TEX>$Fe_3O_4$</TEX> nanoparticles (NPs). The non-ionic surfactant Igepal CO-520 (Poly(oxyethylene)(5) nonylphenyl ether) has been used for the preparation of NPs and the effects on the NP size, size distribution, and magnetic pro…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionQuantum Transport and Field-Induced Insulating States in Bilayer Graphene pnp JunctionsLei Jing, Jairo Velasco, Jr., Philip Kratz, Gang Liu, Wenzhong Bao, Marc Bockrath, and Chun Ning Lau*Cite this: Nano Lett. 2010, 10,…
A synchrotron-radiation-based circular-dichroism end-station has been implemented at beamline BL04B at the National Synchrotron Radiation Research Center (NSRRC) in Taiwan for biological research. The design and performance of this compact end-station for measuring circular-dichroism spectra in the vacuum-ultraviolet…
폴리아믹산(PAA)은 가교가 가능한 2중 결합을 갖는 bicyclo(2,2,2)oct-7-ene-2,3,5,6-telracarboxy-licdianhydride(BTDA)와 bis[4-(3-aminophenoxy)pheny1] sulfone(BAPS)을 N.N-dimethylacetamide(DMAc) 용매에서 반응하여 얻어졌으며, 폴리이미드(PI) 필름은 PAA를 캐스팅하여 각각 다른 반응 온도에서 열처리를 통해 얻었다. 가교 온도를 250~350℃까지 증가하여 얻은 가교된 PI의 열적-기계적 성질, 가교도, 광학적 특성을 열처리 온도에 따라 조사하였다. 열적-기…
Abstract Review: 9 refs.
Diatom silica is a form of biogenic opal (SiO2.nH2O, Figure 1) containing oxygen, silicon, carbon and nitrogen isotopes that can be used in lacustrine and marine paleoenvironmental studies. Since diatoms bloom following a seasonal pattern defined partly by the variability of climate, nutrient supply, mixing regimes, a…
An introduction is provided to three papers which compare corresponding protein crystal and NMR solution structures determined by the Joint Center for Structural Genomics (JCSG). Special mention is made of the JCSG strategy for combined use of the two techniques, and of potential applications of the concept of `refere…
Carbon nanotubes are unique tubular structures of nanometer diameter and large length/diameter ratio. The nanotubes may consist of one up to tens and hundreds of concentric shells of carbons with adjacent shells separation of ~0.34 nm. Multiwalled carbon nanotubes were synthesized by arc-discharge technique. MWCNTs we…
Activated carbons are well known as adsorbents for gases and vapors. Micro porous carbons are used for the sorption/separation of light gases, whereas, carbon with bigger pore size are applied for removal of large molecules. Therefore, the control of pore size of activated carbon plays a vital role for their use in sp…
무수산인 4,4`-(4,4`-isopropylidene-diphenoxy)bis(phthalic anhydride) (BPADA)와 아민계인 2,2`-bis (trifluoromethyl) benzidine (TFB), bis (3-aminophenyl) sulfone (APS), 4,4`-methylene-bis-(2-methylcyclohexylamine) (MMCA), bis[4-(3-aminophenoxy) phenyl] sulfone (BAPS)에 melamine훌 각각 5몰%포 반응시켜 N,N`-dimethylacetamide(DMAc) 용매 속에서 폴…
1. 서 론 고도의 지식적 산업이 기반을 이룰 것이라고 예측되는 21세 기에는 국가의 지식 경쟁력, 특히 과학기술 분야의 국제 경쟁 력을 갖추어야 하는데, 특히 자원과 자본이 부족한 우리의 여 건에서 국가의 과학기술 경쟁력 제고의 수단으로 새로운 소재 의 개발 연구가 중요하다.이러한 관점에서 최근 탄소소재는 우주항공, 에너지, 공해제거용 친환경 소재 등에 직접 응용되 고 있으며 반도체, 자동차, 로봇 산업 등에 활용도를 크게 높 이고 있는 원천 기반소재로, 탄소소재를 이용한 고기능성 및 친환경적인 소재로의 적용을 위하여 선진국에서 활발한 연구 와 공업적인 응용이 시…
Four different cation radical salts are obtained upon electrocrystallization of [Cp(2)W(dmit)] (dmit = 1,3-dithiole-2-thione-4,5-dithiolato) in the presence of the BF(4)(-), PF(6)(-), Br(-), and [Au(CN)(2)](-) anions. In these formally d(1) cations, the WS(2)C(2) metallacycle is folded along the S···S hinge to differe…
Density functional theory calculations are used to study the healing process of a defective CNT (i.e. (8,0) CNT) by CO molecules. The healing undergoes three evolutionary steps: 1) the chemisorption of the first CO molecule, 2) the incorporation of the C atom of CO into the CNT, accompanied by the adsorption of the le…
Abstract The static and the second harmonic generation second‐order nonlinear susceptibilities, χ (2) , of 3‐methyl‐4‐nitropyridine N ‐oxide, 2‐carboxylic acid‐4‐nitropyridine‐1‐oxide, 2‐methyl‐4‐nitroaniline, and m ‐nitroaniline crystals are calculated using a model that combines accurate ab initio molecular properti…
Abstract Hybrid latices of poly(styrene‐ co ‐butyl acrylate) were synthesized via in situ miniemulsion polymerization in the presence of 3 and 6 wt % organically modified montmorillonite (OMMT). Three different ammonium salts: cetyl trimethyl ammonium chloride (CTAC), alkyl dimethyl benzyl ammonium chloride (Dodigen),…
This paper reports the study of microcellular injection molding of low-density polyethylene- (LDPE) based composites. The effects of adding nanoclays and polymer additives in LDPE as well as rheological property of materials on the cell morphology, mechanical properties and surface properties of microcellular injectio…
One-dimensional cobalt nanostructures with large aspect ratio up to 450 have been prepared via a template-free hydrazine reduction route under external magnetic field assistance. The morphology and properties of cobalt nanostructures were characterized by scanning electron microscopy, X-ray diffractometer, and vibrati…
The notorious biofouling organism Dreissena polymorpha (the zebra mussel) attaches to a variety of surfaces using a byssus, a series of protein threads that connect the animal to adhesive plaques secreted onto hard substrata. Here, the use of matrix-assisted laser desorption ionization time-of-flight mass spectrometry…
Excitations of precursor molecules by different laser powers in laser-assisted growth of diamond films using a wavelength-tunable CO 2 laser were studied. The wavelength of the CO 2 laser was tuned to 10.532 μm to match a vibration mode of a precursor molecule, ethylene. The density of the incident laser power was adj…
The peel strength of silica filled on two grades of epoxidized natural rubber (ENR), i.e., ENR 25 and ENR 50 adhesive were investigated using coumarone-indene as the tackifying resin. Toluene was used as the solvent throughout the study. Result shows that peel strength increases with increase in silica loading due to…