Materials Literature
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High performance catalysts or energy devices such as solar cells and batteries which involve reactions and transport problems require nanostructured functional materials that are highly ordered mesoporous and crystalline materials. The self-assembly based structure direction of functional inorganic materials by block…
This thesis presents a study of single-walled carbon nanotubes (SWNTs) using revised Cosserat rod models. A SWNT is a thin hollow cylinder, with diameter of the order of 1 nm and length possibly as large as 1[MICRO SIGN]m. Its wall is composed of a single layer of carbon atoms with an estimated thickness around 0.335…
Two vibrating bubbles submerged in a fluid influence each others' dynamics via sound waves in the fluid. Due to finite sound speed, there is a delay between one bubble's oscillation and the other's. This scenario is treated in the context of coupled nonlinear oscillators with a delay coupling term. It has previously b…
This thesis presents a new potentially low-cost massively parallel electron lithography system, which we term as RadioIsotope-powered Parallel Electron Lithography (RIPEL). We demonstrate its applications to solar cells, thermo-opto-mechanical excitation, inertial sensors, micro-speakers, ultrasonic mechanical DNA sen…
Poly(3-hydroxybutyrate) (PHB) is a biodegradable and biocompatible polymer produced by many bacteria as a stored carbon source. Recent reviews have recently recognized PHB granules as a biomaterial that can be functionalized for use in various biomedical applications. The studies in this dissertation describe a novel…
The resolving equations for the calculation of the stability of polymer compressed rods with the creep using Galerkin method are obtained. The problem is solved in the case of a simply supported pivotally-rod having an initial bending in the plane of the lower stiffness, and in the case of off-center application of fo…
Atomistic simulations can illuminate detailed mechanisms of brittle and ductile fracture and plasticity. However, there are many limitations to these simulations like short timescales, small spatial scales, and limitations of the discretization. Using molecular dynamics (MD) and multiscale methods, adaptations can be…
O presente estudo aborda a caracterizacao das modificacoes ocorridas na microestrutura de um aco de Alta Resistencia e Baixa Liga (ARBL), mais especificadamente do aco API 5L Grau X-80, de grande utilizacao na industria de petroleo e gas no transporte de materias primas a longas distâncias. Afim de que se obtenha uma…
Orientador: Celso Prevedello
Los bioplasticos representan un interesante sector en el mundo de los materiales y actualmente son objeto de un profundo estudio tanto desde el punto de vista academico como tecnologico. Ello es debido principalmente a su origen natural y a su capacidad de biodegradabilidad en condiciones controladas. El almidon es un…
为了解决固体氧化物燃料电池(SOFC)陶瓷连接材料的低成本制备难题, 设计了与LaCrO3基连接材料和Ni基阳极均具有良好烧结匹配性能的新型复合材料NiO/ La0.7Ca0.3Cr0.97O3−δ (LCC97)作为管式SOFC的支撑体. 详细研究了NiO含量(5wt%、25wt%、50wt%、75wt%)对复合支撑体的烧结性能、微观组织、孔隙率、电导性能、热膨胀系数等的影响, 结果表明: LCC97与NiO具有优良的烧结和化学匹配性能, NiO/LCC97(1:1, wt%)具有最优的综合性能. 以其为支撑体, 采用浆料浸渍法制备LCC97湿膜, 1400℃空气条件下共烧, 获得了致密LCC97连接材料薄膜.
A diamond-like carbon (DLC) based solid-lubricant film was designed and DLC films were successfully prepared using a microwave plasma enhanced magnetron sputtering deposition technology. Post-test characterizations including Raman spectrometry, X-ray diffraction, nano-indentation test, adhesion test, friction coeffici…
Los recubrimientos protectores son frecuentemente aplicados para incrementar la resistencia a la corrosion y a la oxidacion de aceros ferritico-martensiticos. En este estudio, los recubrimientos de aluminio modificado con Si fueron depositados mediante deposicion Quimica en Fase Vapor en Lecho Fluidizado a presion atm…
Current biomaterial approaches for repairing the cornea's ocular surface upon injury are partially effective due to inherent material limitations. As a result there is a need to expand the biomaterial options available for use in the eye, which in turn will help to expand new clinical innovations and technology develo…
利用巴黎翠凤蝶前翅翅鳞片作为模板, 通过前驱体浸泡后烧结的方法制备出具有原始蝶翅鳞片准周期三维结构的SnO 2 (金红石相), 并采用化学沉积的方法在已制备的SnO 2 上沉积Au纳米颗粒, 合成出Au/SnO 2 纳米复合材料. 通过SEM、XRD以及TEM等表征方法检测并分析该材料形貌结构和成分组成. 采用罗丹明6G(R6G)作为分析物, 测试该材料的表面增强拉曼散射光谱. 通过材料形貌结构图及UV-Vis漫反射光谱谱图, 分析该基底的表面增强拉曼散射机理. 该基底所具有的三维结构为拉曼信号增强提供大量“热点”, 而基底材料中SnO 2 和Au纳米颗粒为拉曼增强效应提供协同作用. 良好的拉曼性能以及较低的制备成本表明, 该新型…
采用水基原子层沉积(H 2 O-based ALD)方法在石墨烯上直接生长Al 2 O 3 介质薄膜, 研究了Al 2 O 3 成核机理. 原子力显微镜(AFM)对Al 2 O 3 薄膜微观形态分析表明, 沉积温度决定着Al 2 O 3 在石墨烯表面的成核生长情况, 物理吸附在石墨烯表面的水分子是Al 2 O 3 成核的关键, 物理吸附水分子的均匀性直接影响Al 2 O 3 薄膜的均匀性. 在适当的温度窗口(100~130℃), Al 2 O 3 可以均匀沉积在石墨烯上, AFM测得Al 2 O 3 薄膜表面均方根粗糙度(RMS)为0.26 nm, X射线光电子能谱(XPS)表面分析与元素深度剖析表明, 120℃下在石墨烯表面沉积…
Block copolymer self-assembly presents a method for pattern and template application on the 10 to 50 nm length scale. However, the research in this area has been limited to the use of only one block copolymer per layer due to the damage and intermixing when spin coating of a second polymer layer. Here we propose a new…
The small lateral dimensions of spintronic devices and high density memory bits require the employment of magnetic ultrathin metallic film structures. Understanding the structure of such films is a critical component of developing the correct interpretation of their magnetic behaviour. The Molecular Beam Epitaxy facil…
This thesis represents a body of work investigating the physics of strongly interacting quantum particles, confined to a two-dimensional plane in a nontrivial vector potential (such as a transverse magnetic field), commonly referred to as quantum Hall physics. The result which anchors these studies is my discovery, re…
In this work, (Ca 1-xCu x)TiO 3 crystals with (x = 0, 0.01 and 0.02), labeled as CTO, CCTO1 and CCTO2, were synthesized by the microwave-hydrothermal method at 140°C for 32 min. XRD patterns (Fig. 1), Rietveld refinement and FT-Raman spectroscopy indicated that these crystals present orthorhombic structure Pbnm. Micro…