Materials Literature
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The Pnma incommensurate phase transition in the perovskite Pr(0.48)Ca(0.52)MnO(3) at ∼ 235 K is accompanied by shear strains of up to ∼ 2.5% (from neutron diffraction) and changes in the shear modulus of up to ∼ 40% (from resonant ultrasound spectroscopy, RUS), indicating strong coupling between the structural order p…
PURPOSE: Electron spin-echo (ESE) oxygen imaging is a new and evolving electron paramagnetic resonance (EPR) imaging (EPRI) modality that is useful for physiological in vivo applications, such as EPR oxygen imaging (EPROI), with potential application to imaging of multicentimeter objects as large as human tumors. A pr…
A quantitative and systematic investigation about the molecular nature of the dielectric and mechanical properties of organic/inorganic hybrid glass film with alkylene bridges was performed. The hybrid glass film was prepared from a sol precursor solution of the mixture of tetraethoxysilane (TEOS) and bis(triethoxysil…
Carbon-carbon (C/C), carbon-carbon-silicon carbide (C/C-SiC) composites and titanium alloy substrates were bonded in single lap and overlap joints with phenolic resin to study the differences in joint strength of two similar and dissimilar materials under shear load. The results indicate that the bonding strength of s…
Aspects of orbital paramagnetism and intermolecular interactions are discussed in relation to compounds containing octahedral molecules (where is a transition metal) and Chevrel phase cuboctahedron systems . The 100th anniversary of the birth of Professor S A Altshuler, a pioneer in the use of NMR for studying Van Vle…
루틴은 항발암, 소염제, 항바이러스성 기능을 갖는 물질이다. 미생물이 만들어낸 폴리에스테르인 PHBV와 루틴을 전기방사하여 나노섬유 부직포를 얻었다. 나노섬유 부직포의 항균성은 황색포도상구균(Staphylococcus aureus), 폐렴간균(Klebsiella pneumoniae)을 사용하여 평가하였고, KB 셀을 이용하여 세포독성을 평가하였다. 그 결과 루틴을 3 wt% 함유할 때 지지체는 우수한 항균성을 보였으며, KB 셀을 이용한 실험결과로부터 루틴을 함유하는 PHBV 지지체는 세포독성을 나타내지 않음을 알 수 있었다.
Hummers와 Offeman 방법을 이용하여 흑연으로부터 graphene oxide(GO)를 합성하였다. Hydrazine hydrate를 사용하여 GO를 환원시켜 reduced graphene oxide(RGO)를 합성하였으며, 말단에 amine이 치환된 유기화제를 사용하여 관능기화 그래핀을 합성하였다. 합성된 GO, RGO, 그리고 관능기화 그래핀의 구조를 확인하기 위하여 FTIR과 13C NMR를 이용하였다. 합성된 시료들의 열 안정성, 모폴로지 및 다양한 유기용매 내에서의 분산도를 각각 조사하였다. AFM 사진으로부터 GO와 RGO는 한층 또는 두층 두께의…
Exposure of skin to various chemical and physical agents results in excessive stress to the outermost cell layer of the skin, causing different degenerative effects that can be minimized by using antioxidant formulations. The major challenge, in this regard, is to develop a formulation, which can prevent photodegradat…
Abstract Polymer chains consisting of water‐soluble polyacrylamides and N‐isopropylacrylamide (NIPAM), hydrophobically modified with low amounts of N,N‐dialkylacrylamides (N,N‐dioctylacrylamide) have been prepared via free radical micellar polymerization, using a hydrophobic initiator derived from 4,4′‐azobis(4‐cyanop…
We provide insight into the C1s x-ray absorption response of ${\mathrm{C}}_{60}$ encaged in metallicity-sorted single-walled carbon nanotubes. The partial density of states observed for different constituent species unveils their distinct electronic properties. We identify the relative positions and filling of the one…
A novel approach to creating a gap on the nanometer scale between two adjacent electrodes of the same or different metals is described. The gap size can be well controlled through sidewall coverage in a self-aligned manner and it can be tuned from 60 nm down to 5 nm with high reproducibility. This technique is fully c…
Mesoporous titanium dioxide ( $TiO_2$ ) thin films were prepared using poly(vinyl chloride)-graft-poly(N-vinyl pyrrolidone) (PVC-g-PVP) as a templating agent via sol-gel process. Grafting of PVC chains from PVC backbone was done by atom transfer radical polymerization (ATRP) technique. The successful grafting of PVP t…
以聚乳酸、正硅酸乙酯和硝酸钙为原料, 采用溶胶-凝胶方法制备了不同比例的聚乳酸/SiO 2 -CaO多孔复合薄膜. 采用扫描电子显微镜和红外光谱仪对薄膜的微观结构和组成进行分析, 并利用表面Zeta电位测定仪对其表面电位进行表征, 通过模拟体液浸泡实验和MTT方法对薄膜的生物活性和细胞毒性进行评价. 结果表明: 复合薄膜在模拟体液中经过7d的浸泡, 薄膜表面形成了环状结构的类骨磷灰石层; 随着SiO 2 -CaO含量增加, 复合薄膜表面微孔的孔径变小, 薄膜表面Zeta电位变负, 诱导类骨磷灰石沉积的能力增强; MTT实验证实复合薄膜对MG-63细胞没有毒性且有利于细胞的增殖.
Duales Reaktionszentrum: Die katalytische Reaktion H2+O2 an einem Au/TiO2-Katalysator wurde durch Transmissions-IR-Spektroskopie und DFT-Rechnungen untersucht. Für die O2-unterstützte H2-Dissoziation wurde gefunden, dass sie über eine Ti-OOH-Zwischenstufe am Au/TiO2-Perimeter verläuft. Die berechneten Energiebarrieren…
Abstract Grafting of maleic anhydride (MAH) onto isotactic poly butene‐1 (iPB‐1) was carried out by thermal decomposition of dicumyl peroxide (DCP) using electron‐donating monomer styrene (St), and were carried out in the molten state in a twin‐screw extruder according to an experimental design in which the content of…
Abstract Ultrahigh molecular weight fibers were treated by low energy ion beam in a pulse regime. Results of infrared and WAXD analyses showed the change of both chemical structure and morphology of the fiber surface. Adhesion of the treated fiber surface to conventional binders appeared to be two times higher than th…
Cobalt (II), copper (II), iron (III), manganese (II) and nickel (II) complexes of barbituric acid were synthesized and characterized by infrared and ultraviolet spectroscopy. The ligand and the complexes have been screened for in vitro antibacterial activity against a range of Gram-positive and Gram-negative bacteria…
Bragg gratings with a second-order resonance wavelength in the near-IR spectral region have been inscribed into single-mode chalcogenide (As 2 S 3 ) glass fibre by a He — Ne laser beam using a configuration typical of Bragg grating fabrication in germanosilicate fibre, with the use of a phase mask that ensures effecti…
Abstract Monomeric zinc(II) and mercury(II) complexes containing tripodal nitrogen donor ligand 2,6‐bis(3,4,5‐trimethyl‐N‐pyrazolyl)pyridine (btmpp) were synthesized, and characterized by elemental and spectroscopic (IR, UV/Vis) analyses, TG‐DTA and single‐crystal X‐ray diffraction studies. X‐ray analyses of the compl…
For the last 10 years pharmaceutical research and industry has elucidated several innovations and practices in pharmaceutical nanotechnology. Due to the increasing use of nanoparticles, the risk of human exposure rapidly increases and reliable toxicity test systems are urgently needed. Nanotoxicology refers to the stu…