Materials Literature
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Graphene-based sheets show promise for a variety of potential applications, and researchers in many scientific disciplines are interested in these materials. Although researchers have developed many ways of generating single atomic layer carbon sheets, chemical exfoliation of graphite powders to graphene oxide (GO) sh…
Carbon nanotubes and materials based on carbon nanotubes have many perceived applications in the field of biomedicine. Several highly promising examples have been highlighted in the literature, ranging from their use as growth substrates or tissue scaffolds to acting as intracellular transporters for various therapeut…
Cellulose nanocrystals were extracted from Agave angustifolia fibres by alkali and bleaching treatments followed by acid hydrolysis. The chemical composition of the Agave fibres was determined at different stages of chemical treatment. The structural analysis was carried out by a Fourier Transform Infrared spectroscop…
Field emission studies are reported for the first time on layered MoS₂ sheets at the base pressure of ∼1 × 10⁻⁸ mbar. The turn-on field required to draw a field emission current density of 10 μA/cm² is found to be 3.5 V/μm for MoS₂ sheets. The turn-on values are found to be significantly lower than the reported MoS₂ n…
Abstract Bakground Biological methods for metal nanoparticle synthesis using plant extracts have been suggested as possible ecofriendly alternatives to chemical and physical methods. In the present study, copper nanoparticles were biologically synthesized using Magnolia kobus leaf extract as reducing agent and their a…
Synthesis of nitrogen-doped carbons with large surface area, high conductivity, and suitable pore size distribution is highly desirable for high-performance supercapacitor applications. Here, we report a novel protocol for template synthesis of ultrathin nitrogen-doped graphitic carbon nanocages (CNCs) derived from po…
Nanoparticles (NPs) are of similar size to typical cellular components and proteins, and can efficiently intrude living cells. A detailed understanding of the involved processes at the molecular level is important for developing NPs designed for selective uptake by specific cells, for example, for targeted drug delive…
π in the sky: A squaraine-linked, conjugated two-dimensional porphyrin covalent organic framework (COF; see scheme; C: gray, H: white, N: blue, Cu: red) was synthesized. Owing to the π-conjugated linkage together with the eclipsed stacking of the units, this COF exhibits enhanced chemical and thermal stabilities. It a…
We reported the development of a new type of multifunctional titanium dioxide (TiO2)-graphene nanocomposite hydrogel (TGH) by a facile one-pot hydrothermal approach and explored its environmental and energy applications as photocatalyst, reusable adsorbents, and supercapacitor. During the hydrothermal reaction, the gr…
While nanoparticles occur naturally in the environment and have been intentionally used for centuries, the production and use of engineered nanoparticles has seen a recent spike, which makes environmental release almost certain. Therefore, recent efforts to characterize the toxicity of engineered nanoparticles have fo…
Shale is a sedimentary rock rich in kerogen, organic complex mixture which can be extracted in the form of oil and gas.Industrial shale processing description is based models representing the heat transfer in drying, heating and pyrolysis.The extraction of organic matter from rock by heating (pyrolysis) is a great inv…
The field of molecular photo-isomerisable switches has drawn major interest recently. Molecules which can efficiently and reversibly be transformed from one form to another by light are promising for use in molecular electronics, data-storage or as motors in molecular machines. \nThe topic of this thesis are two impor…
针对硝基苯催化加氢合成对氨基苯酚（PAP）反应,以HZSM-5（n（SiO2）/n（Al2O3）=25）为载体,制备了不同Pt负载量的Pt/HZSM-5及Pb-Pt/HZSM-5双功能催化剂,采用透射电镜（TEM）、氢气程序升温脱附（H2-TPD）、CO吸附漫反射红外光谱（DRFTIR）和X射线光电子能谱（XPS）技术对催化剂结构和电子性能进行了表征,同时评价了催化剂催化合成PAP的活性。结果表明,Pb的掺杂改性能有效提高Pt在载体表面的分散度,改性后催化剂Pt的电子密度增大。Pb-Pt/HZSM-5催化剂催化合成PAP的选择性明显高于相同负载量下的Pt/HZSM-5催化剂。由于Pb、Pt之间相互作用导致的Pt活性位上电子密度的增…
Biomedical applications of nanoperticles have been attracting growing interest as a drug carrier and an imagingprobe. In this context, we are focusing on the nanodiamond because of the low-toxic and surface-modifiable nature. In thispaper, we will report on the progress on the application of nanodiamond and other nano…
バイオ・マテリアル学科 坂井賢一(Ken-
Les procédés de mise en forme de tôles minces sont très largement répandus dans l’industrie. Néanmoins, l’utilisation de ces procédés est limitée par le niveau de formabilité du matériau formé, notamment dans le cas des alliages d’aluminium. Afin d’améliorer ces limites de formabilité, des procédés de mise en forme à…
Ao aplicarmos um campo magnético perpendicularmente `a uma placa condutora bidimensional percorrida por corrente elétrica, verificamos um desvio das cargas elétricas para uma das bordas. Logo, a outra borda ficará eletricamente carregada com sinal oposto em relação à primeira. Esta diferença de potencial surgida transve…
Na Região Nordeste do Brasil, nas últimas décadas, com o incremento da irrigação em perímetros irrigados, muitas vezes com manejo inadequado às condições locais, os processos de salinização e sodificação de solos têm se intensificado, promovendo a degradação e abandono de extensas áreas anteriormente produtivas. Assim…
CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Métodos acurados de avaliação de tenacidade à fratura, incluindo curvas de resistência ao rasgamento dúctil de juntas soldadas de dutos e risers rígidos, tornam-se essenciais em procedimentos de avaliação de defeitos em regiões de soldas e zonas termicamente afetadas, nas quais defeitos não detectados podem se propaga…