HyukSu Han

We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2)(2)CH3, -CH2(CH2)(4)CH2-, -C(6)H(5), -(CH2)(7)CH3, and -(CH2)(11)CH3 groups through a modified one-step process. The scanning electron microscopy (SEM), quasi-elastic light scattering (QELS), UV-visible spectra, nitrogen sorption, and water vapor adsorption methods are used to characterize the particles. The SEM micrographs of the particles demonstrate that the modified particles ar

This study investigated the correlation between the microstructure and the mechanical properties of pure Ti specimens manufactured via selective laser melting (SLM) using the stress relief heat-treatment process. Similar heat treatments were performed at a rate of 10 °C/min with a dwell time of 2 h to reach post-treatment temperatures ranging from of 490 to 890 °C in intervals of 100 °C. Phase change analysis using X-ray diffraction was conducted to verify the effects of the post-treatment proce

Abstract The efficiency of water electrolysis is constrained by the substantial energy requirements of the anodic oxygen evolution reaction (OER) process. It is crucial to solve the issue for efficient and energy‐efficient device manufacture. Geometric distortion in transition metal complexes significantly affects their performance. The Jahn‐Teller (J.T.) distortion is a geometric distortion that results in various electronic and structural alterations in transition metal complexes. Recently, th

Direct formic acid fuel cells (DFAFCs) stand out for portable electronic devices owing to their ease of handling, abundant fuel availability, and high theoretical open circuit potential. However, the practical application of DFAFCs is hindered by the unsatisfactory performance of electrocatalysts for the sluggish anodic formic acid oxidation reaction (FAOR). Palladium (Pd) based nanomaterials have shown promise for FAOR due to their highly selective reaction mechanism, but maintaining high elect

During aluminum (Al) electrolysis, large amounts of spent cathode carbon (SCC) are generated, often contaminated with hazardous substances such as fluorides and cyanides. As a result, SCC is classified as a dangerous solid waste posing long‐term risks to ecosystems and human health if untreated. This review comprehensively analyzes the chemical composition, formation mechanisms, and environmental hazards of SCC, and summarizes current physical and chemical remediation strategies. Unlike previous

Pure titanium (Ti), known for its exceptional corrosion resistance, high specific strength, and biocompatibility, is increasingly employed in patient-specific biomedical components and aerospace applications. While Selective Laser Melting (SLM) offers superior design flexibility and near-net-shape capabilities for fabricating complex geometries, the process still faces challenges in controlling the surface quality of down surface regions, where incomplete melting, powder adhesion, and steep ther

Ti–6Al–4V alloy fabricated via selective laser melting (SLM) inherently develops high residual stresses due to rapid cooling and steep thermal gradients. To address this, stress relief (SR) heat treatment was performed below the β-transus temperature (0.3–0.5 Tm) to enable atomic diffusion without triggering full phase transformation. This study investigates the effects of SR treatment on microstructural evolution, dislocation density, residual stress, and mechanical properties. Residual stress

This study investigates how energy density and subsequent hot isostatic pressing (HIP) affect the density, microstructure, electrical conductivity, and mechanical properties of pure copper (Cu) components fabricated by selective laser melting (SLM). Components were produced at three calculated energy densities 3.11, 6.22, and 9.34 J·mm -3 and then subjected to a thermo-mechanical HIP treatment (600 °C, 2000 bar, 2 h). As the as-built energy density increased during the SLM process, lack-of-fusio

The development of green hydrogen generating technology is currently of the utmost importance. The photoelectrochemical water splitting (PECWS) is one of the primary methods for green hydrogen generation. Recently, individuals have been investigating atomically dispersed sites anchored on semiconductor supports for the PECWS. The single‐atom catalysts (SACs) offer very accurate catalytic sites which improve the reaction kinetics for both hydrogen and oxygen evolution reactions. This review empha