KNT-Scientific-Publications

Influence of probe-sample temperature difference on thermal mapping contrast in scanning thermal microscopy imaging

The purpose of this work is to investigate the influence of a temperature difference through a probe-sample contact on thermal contrast in Scanning Thermal Microscopy imaging. A variety of combinations of temperature differences in the probe-sample system were first analyzed based on an electro-thermal finite element model. The numerical analysis included cooling the sample, as well as heating the sample and

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KNT-Scientific-Publications

InGaN/GaN Laser Diodes With High Order Notched Gratings

We report on InGaN/GaN distributed feedback laser diodes with high order gratings emitting at a single wavelength around 428 nm. The 39th order notched gratings have the advantage of a simplified fabrication route with no need for overgrowth. The laser ridge and grating were formed by electron beam lithography followed by ICP etching. The as-cleaved

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KNT-Scientific-Publications

Generation and precise control of dynamic biochemical gradients for cellular assays

Spatial gradients of diffusible signalling molecules play crucial roles in controlling diverse cellular behaviour such as cell differentiation, tissue patterning and chemotaxis. In this paper, we report the design and testing of a microfluidic device for diffusion-based gradient generation for cellular assays. A unique channel design of the device eliminates cross-flow between the source and

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KNT-Scientific-Publications

Thermal properties measurements of a silica/pyrocarbon composite at the microscale

Laminar pyrocarbons are used as interphases or matrices of carbon/carbon and ceramic-matrix composites in several high-temperature aerospace applications. Depending on their organization at the microscale, they can have a variety of mechanical and thermal properties. Hence, it is important to know, before thermal processing, the properties of these matrices at the micrometer scale in order

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KNT-Scientific-Publications

Probing Nanoscale Heat Transport in Liquid Environments—Contact and Non-Contact Immersion Scanning Thermal Microscopy (iSThM)

Operation of Scanning Thermal Microscopy (SThM) [1] in liquid environment probing thermal phenomena with nanoscale resolution could open unique opportunities for studies of biological materials, processes in the rechargeable energy storage and catalysis. Until recently such SThM operation would be deemed fully impossible, due to dominating heat dissipation from the heated probe into the surrounding

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KNT-Scientific-Publications

Nano-Localized Thermal Analysis and Mapping of Surface and Sub-Surface Thermal Properties Using Scanning Thermal Microscopy (SThM)

Determining and acting on thermo-physical properties at the nanoscale is essential for understanding/managing heat distribution in micro/nanostructured materials and miniaturized devices. Adequate thermal nano-characterization techniques are required to address thermal issues compromising device performance. Scanning thermal microscopy (SThM) is a probing and acting technique based on atomic force microscopy using a nano-probe designed to act

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