Browsing by Author "Clarke, David"
Now showing items 1-20 of 39
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Anisotropic Thermal Diffusivity and Conductivity in La-Doped Strontium Niobate Sr2Nb2O7
Sparks, Taylor David; Fuierer, Paul A.; Clarke, David R. (Wiley-Blackwell, 2010)The thermal diffusivity of the La-doped layered perovskite Sr2Nb2O7 parallel and perpendicular to the perovskite layers is reported from room temperature up to 1000°C. The anisotropy persists through an incommensurate-normal ... -
Bacterial Approaches to the Recovery of Scarce Metals
Bonificio, William Daley (2015-05-05)Many of the scarcest metals are critical to future energy technologies. However, these metals often have limited supplies, and their current production and recycling methods are complicated and use toxic chemicals. In ... -
Bacterial recovery and recycling of tellurium from tellurium-containing compounds by Pseudoalteromonas sp. EPR3
Bonificio, William Daley; Clarke, David R. (Wiley-Blackwell, 2014)Aims: Tellurium-based devices, such as photovoltaic (PV) modules and thermoelectric generators, are expected to play an increasing role in renewable energy technologies. Tellurium, however, is one of the scarcest elements ... -
Buckling Induced Functionality in Soft Structures
Liu, Jia (2016-04-18)A variety of instabilities can be triggered when elastic structures are subjected to mechanical loadings. While such instabilities have traditionally been considered as a failure, a new trend is emerging in which the ... -
Complex Ordered Patterns in Mechanical Instability Induced Geometrically Frustrated Triangular Cellular Structures
Kang, Sung Hoon; Shan, Sicong; Kosmrlj, Andrej; Noorduin, Wim L.; Shian, Samuel; Weaver, James C.; Clarke, David R.; Bertoldi, Katia (American Physical Society, 2014)Geometrical frustration arises when a local order cannot propagate throughout the space because of geometrical constraints. This phenomenon plays a major role in many systems leading to disordered ground-state configurations. ... -
A data-driven review of thermoelectric materials: Performance and resource considerations
Gaultois, Michael W.; Sparks, Taylor D.; Borg, Christopher K. H.; Seshadr, Ram; Bonificio, William D.; Clarke, David R. (American Chemical Society, 2013)In this review, we describe the creation of a large database of thermoelectric materials prepared by abstracting information from over 100 publications. The database has over 18,000 data points from multiple classes of ... -
Dielectric elastomer actuators under equal-biaxial forces, uniaxial forces, and uniaxial constraint of stiff fibers
Lu, Tongqing; Huang, Jiangshui; Jordi, Christa; Kovacs, Gabor; Huang, Rui; Clarke, David R.; Suo, Zhigang (Royal Society of Chemistry, 2012)A membrane of a dielectric elastomer deforms when a voltage is applied through its thickness. The achievable voltage-induced deformation is strongly affected by how mechanical loads are applied. Large voltage-induced ... -
Dielectric elastomer generator with equi-biaxial mechanical loading for energy harvesting
Huang, Jiangshui; Shian, Samuel; Suo, Zhigang; Clarke, David R. (Society of Photo-Optical Instrumentation Engineers (SPIE), 2013)Dielectric elastomer generators (DEGs) are attractive candidates for harvesting electrical energy from mechanical work since they comprise relatively few moving parts and large elastomer sheets can be mass produced. ... -
Effect of High-Temperature Aging on the Thermal Conductivity of Nanocrystalline Tetragonal Yttria-stabilized Zirconia
Limarga, Andi M.; Shian, Samuel; Baram, Mor; Clarke, David R. (Elsevier, 2012)The thermal conductivity of yttria-stabilized zirconia (YSZ) thermal barrier coatings increases with high-temperature aging. This common observation has been attributed to the densification of the coatings as porosity ... -
Effect of Silane Coupling Agent Chemistry on Electrical Breakdown across Hybrid Organic–Inorganic Insulating Films
Diebold, Roger Mitchell; Gordon, Michael J.; Clarke, David R. (American Chemical Society, 2014)Dielectric breakdown measurements were conducted on self-assembled monolayer (SAM)/native silicon oxide hybrid dielectrics using conductive atomic force microscopy (C-AFM). By depositing silane coupling agents (SCAs) through ... -
Electrically tunable window device
Shian, Samuel; Clarke, David R. (The Optical Society, 2016)A device for controlling the transmittance of light over large areas, such as windows, is described. It is based on electrostatically induced surface deformation of soft dielectric elastomer sheets produced when a voltage ... -
Electrically-tunable surface deformation of a soft elastomer
Shian, Samuel; Clarke, David R. (Royal Society of Chemistry (RSC), 2016)The flat surface of a thin elastomer on a conducting substrate can be deformed by applying an electric field to a percolating network of metallic nanowires randomly dispersed over the surface. The magnitude of the field-induced ... -
First-principles calculations of the high-temperature phase transformation in yttrium tantalate
Feng, Jing; Shian, Samuel; Xiao, Bing; Clarke, David R. (American Physical Society (APS), 2014)The high-temperature phase transition between the tetragonal (scheelite) and monoclinic (fergusonite) forms of yttrium tantalite (YTaO4 ) has been studied using a combination of first-principles calculations and a Landau ... -
Giant, Voltage-Actuated Deformation of a Dielectric Elastomer under Dead Load
Huang, Jiangshui; Li, Tiefeng; Foo, Choon Chiang; Zhu, Jian; Clarke, David R.; Suo, Zhigang (American Institute of Physics, 2012)Far greater voltage-actuated deformation is achievable for a dielectric elastomer under equal-biaxial dead load than under rigid constraint usually employed. Areal strains of 488% are demonstrated. The dead load suppresses ... -
High-Speed, Compact, Adaptive Lenses Using In-Line Transparent Dielectric Elastomer Actuator Membranes
Shian, Samuel; Diebold, Roger Mitchell; Clarke, David R. (Society of Photo-Optical Instrumentation Engineers (SPIE), 2013)Electrically tunable adaptive lenses provide several advantages over traditional lens assemblies in terms of compactness, speed, efficiency, and flexibility. We present an elastomer-liquid lens system which makes use of ... -
Highly compliant transparent electrodes
Shian, Samuel; Diebold, Roger Mitchell; McNamara, Alena; Clarke, David R. (AIP Publishing, 2012)Adaptive optical devices based on electric field induced deformation of dielectricelastomers require transparent and highly compliant electrodes to conform to large shape changes. Electrical, optical, and actuation properties ... -
Large, Uni-directional Actuation in Dielectric Elastomers Achieved By Fiber Stiffening
Huang, Jiangshui; Zhu, Jian; Clarke, David R.; Suo, Zhigang (American Institute of Physics, 2012)Cylindrical actuators are made with dielectric elastomer sheets stiffened with fibers in the hoop direction. When a voltage is applied through the thickness of the sheets, large actuation strains are achievable in the axial ... -
Maximizing the Energy Density of Dielectric Elastomer Generators Using Equi-Biaxial Loading
Huang, Jiangshui; Shian, Samuel; Suo, Zhigang; Clarke, David R. (Wiley-VCH Verlag Berlin, 2013-03-29)Dielectric elastomer generators (DEGs) for harvesting electrical energy from mechanical work have been demonstrated but the energy densities achieved are still small compared with theoretical predictions. We show that ... -
Multi-scale architectured thermoelectric materials in the Mg2(Si,Sn) system
Gorsse, S.; Vivès, S.; Bellanger, P.; Riou, D.; Laversenne, L.; Miraglia, S.; Clarke, David R. (Elsevier BV, 2016)Two different microstructural architectures featuring multiple length scales have been created in the thermoelectric Mg2(SixSn1−x) system. The first one combines the nano-grain microstructure, characteristic of rapid ... -
Nanocalorimetry Experiments and First-Principles Theoretical Studies of Solid-State Reactions in Nanolaminates
Lee, Dongwoo (2016-05-04)The extraordinary sensitivity and extremely small thermal mass of chip-based nanocalorimetry sensors allow the study of reactions in thin films over a broad range of heating rates, from isothermal to 10^5 K/s. First-principles ...