Nanotechnology for Materials and Manufacturing — Physics, Synthesis, and Devices

Nanotechnology introduces unprecedented research opportunities in various energy and environment related applications. This issue in ES Materials and Manufacturing contains many interesting papers to show the potential development along this important research direction, ranging from fundamental physics, materials synthesis, to novel device applications. As the most ubiquitous form of energy, heat has been used ever since the beginning of human being history and thermal sciences still remain as a vibrant field with new possibility in nanomaterials. In this issue, Xiao et al. (10.30919/esmm5f237) reviewed the recent studies on thermal transport within periodic porous films, 2D materials, and 3D structures. These materials have been widely studied in recent years for potential applications in thermoelectric energy conversion and thermal management. When heat can be manipulated as waves instead of particlelike phonons, existing studies on acoustic/optics can be extended to thermal applications. This review mainly addresses the challenge and limitation for such “phononic crystals,” in analogy to “photonic crystals” for light manipulation. Other than material development, new measurement techniques are also critical to thermal studies. Wang et al. (10.30919/esmm5f239) proposed a modified steady-state hot wire method that can characterize convection heat transfer coefficient of microwires without the knowledge of thermal conductivity for the microwire. This technique can be potentially used for microscale to nanoscale convection studies. For mass production of materials in manufacturing, enormous attention should be paid to the process-structure-property relationships due to employed synthesis techniques. Here Mitkari and Ubale (10.30919/esmm5f231) grew nanostructured CoS thin films on an amorphous glass substrate by the SILAR method. These films showed hexagonal structures, while their electrical resistivity and activation energy were found to be thickness dependent. For thermoelectrics, Artini et al. (10.30919/esmm5f221) varied the applied pressure used for the spark plasma sintering of filled skutterudite. The resulting power factors were checked for samples belonging to the Sm (Fe Ni ) Sb y x 1-x 4 12