Joon-Hwan Choi's research while affiliated with Korea Institute of Materials Science and other places

... The main peak at ca. 445 cm − 1 and a second broad peak at 560 cm − 1 were observed, attributed to the F 2g octahedral symmetric vibrational mode and defect-induced mode (D), respectively 19 . The F 2g symmetry pattern is characteristic of ceria uorite structures 20 . ...

... In terms of energy efficiency, our setup obtains almost identical inactivation results at only a quarter of the energy requirement. However, it is well established that gram-negative species are more susceptible to NTP than grampositive species, which might explain this observation [28,30]. ...

... Firstly, the choice of active cathode metal determines the cathode microstructure [12], which governs electronic and ionic transport. This is of particular importance for high-temperature sodium-metal chloride cells with high mass loading and areal capacity (e.g. ...

... However, with increasing demands on large-scale energy storage due to climate change and the bloom of a solid-state battery, applications of Na-β"alumina are seemingly rising again because of the abundance of sodium as compared to lithium sources and the high ionic conductivity of about 1 S cm −1 in single crystal Na-β"alumina and 0.2-0.4 S cm −1 in polycrystalline β"-alumina at 300 • C [4][5][6][7][8][9][10]. For example, recently, Fertig et al. have provided a detailed review on the potential revival of Na-β"-alumina for sodium solid-state batteries [4]. ...

... [1] The aggregation of simple molecular precursors through non-covalent interactions can obtain critical structures or organizations to life, such as deoxyribonucleic acid (DNA), protein, and phospholipid membranes, [2] which inspires chemists to construct complex and versatile suprastructures from simple fragments via non-covalent interactions. "Supraparticles" are controllable self-assembly systems formed by two or more nanoparticles through noncovalent interactions [3] and have been widely explored in nanomaterial, optics, biology and magnetism in recent years. [4][5][6][7] Clusters can be viewed as intermediate states between molecules and nanoparticles. ...

... The samples were dried at 120 • C for 30 min before the sample weight was measured. The weight loss of the electrode is calculated as follows [21]: ...

... As a very important microwave dielectric material, Al 2 O 3 ceramics are widely used in antennas, resonators, filters, and other equipment due to its high strength, corrosion resistance and outstanding microwave dielectric properties [1][2][3]. However, pure Al 2 O 3 ceramics require a high temperature exceeding 1500 • C to be sintered [4], which does not meet the requirements of modern industrial green energy conservation. So, reducing the sintering temperature of Al 2 O 3 ceramics is very important. ...

... Tan et al., in a recent study, looked into the benefits of coupling piezoelectric galloping energy harvesting with the natural environment [20]. By utilizing vortex-induced vibrations [20][21][22][23][24][25][26] and galloping, the harvesters generated more energy [21,[27][28][29][30][31]. Furthermore, PEH have been studied for their possible application in devices that harness energy from human movements [32][33][34][35][36][37]. ...

... The quite large variability in sintering conditions for zirconia experiments produced by CPP or even CCT could be associated with the amount and nature of stabilizing agents used in these ceramics. In fact, several manuscripts studied the optimal conditions to attain high densities [51,64,81,89,94,149,157,159,163,180,189,191,199,200,203,204,234,245,248,300,308], whereas other studies have been focused on decreasing the sintering temperature of a certain material or optimizing several parameters in the powders compaction [129,204,230,308]. As an example, Fu et al. 2014 [300] varied UP and CIP pressures load and sintering temperatures in the fabrication of alumina by CPP and analyzed the final properties. ...

... 6,7 The ability to adapt, control, and modify these features hinges on the close interplay between the synthesis conditions and the various reaction pathways that are conceivable from the synthesis. 8,9 But when diffusion governs the process, few options are available to effectively reduce the energy barriers, steer the reaction coordinates, and achieve predictable reaction kinetics toward the most desirable products. 10,11 In addition, computational methods frequently assume diffusion as the governing process when predicting the possible phase outcomes from a given material system. ...