Publications by authors named "Sangwook Sihn"
Article Synopsis
- * Researchers developed computational tools to discover how material properties affect switching mechanisms in memristors, particularly in tantalum oxide based resistive random-access memory combined with NMOS transistors.
- * A multiphysics model utilizing partial differential equations was created to analyze the electrical and thermal behaviors of memristors as they switch states, successfully predicting the I-V characteristics in various configurations.
Article Synopsis
- Shape memory polymers (SMPs) have advantages like low density and easy processing but lack mechanical strength compared to shape memory alloys, making reinforcement with materials like inorganic nanowires and carbon nanotubes (CNTs) a promising approach for improving their properties.* ! -
- The typical method of creating SMP composites (SMPCs) by mixing nanowires with monomers results in only slight mechanical improvements due to the limitations of mixing rules.* ! -
- A new fabrication technique is introduced, which uses pre-fabricated nanowire foams combined with SMPs, leading to a 300% improvement in elastic modulus, significantly surpassing traditional methods.* !
Scalable and repeatable determinations of continuous wave (CW) laser-induced damage thresholds are required to develop materials for applications ranging from deformable mirrors to momentum transfer. Current standards assume sample geometries and beam conditions where CW damage thresholds are constant in linear power density, depend strongly on substrate thermal conductivity, and are insensitive to environmental conditions. In this work, the CW laser response of thin PET films with a reflective Al/MgF coating are experimentally assessed over a range of beam diameters and irradiances.
View Article and Find Full Text PDFHierarchically organized three-dimensional (3D) carbon nanotubes/graphene (CNTs/graphene) hybrid nanostructures hold great promises in composite and battery applications. Understanding the junction strength between CNTs and graphene is crucial for utilizing such special nanostructures. Here, in situ pulling an individual CNT bundle out of graphene is carried out for the first time using a nanomechanical tester developed in-house, and the measured junction strength of CNTs/graphene is 2.
View Article and Find Full Text PDFThermal management in polymeric composite materials has become increasingly critical in the air-vehicle industry because of the increasing thermal load in small-scale composite devices extensively used in electronics and aerospace systems. The thermal transport phenomenon in these small-scale heterogeneous systems is essentially controlled by the interface thermal resistance because of the large surface-to-volume ratio. In this review article, several modeling strategies are discussed for different length scales, complemented by our experimental efforts to tailor the thermal transport properties of polymeric composite materials.
View Article and Find Full Text PDFThe through-thickness thermal conductivity in conventional adhesive joints (of approximately 0.3 W/m-K) fails to meet the thermal load transfer requirement in numerous applications to enable lean manufacturing and improve system reliability to thermal load. Carbon nanotubes are known to possess extremely high thermal conductivity along the longitudinal axis.
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