• Research Paper

    Dependence on Surface Roughness of Electrical and Electrochemical Properties of Non-Porous and Porous Titanium Sheets
    Minsu Park, Taeho Lee, Manho Park, Si Young Chang
    Titanium sheets are used in various electrochemical applications because of their excellent corrosion resistance and electrical stability. In this study, the effects … + READ MORE
    Titanium sheets are used in various electrochemical applications because of their excellent corrosion resistance and electrical stability. In this study, the effects of changes in surface roughness on sheet resistance and corrosion behavior of non-porous and porous titanium sheets were compared. In the as-received condition, the surface roughness (Ra) values of the non-porous and porous sheets were 0.06 and 2.41 µm, respectively, and the corresponding sheet resistance values were 4.82 and 10.62 mΩ/□. Potentiodynamic polarization tests performed in 0.5 M H2SO4 showed that the corrosion potentials (Ecorr) of the non-porous and porous sheets were -0.301 and -0.362 V, respectively, while the corrosion current densities (Icorr) were 0.117 and 0.812 µA･cm-2, respectively. The porous sheet showed a higher Icorr than the non-porous sheet, indicating relatively lower corrosion resistance. As surface roughness was increased by polishing with SiC sandpapers (G100-G1200), the sheet resistance increased in both sheets. In addition, the corrosion current density increased. EIS analysis also showed a decreasing tendency in polarization resistance (Rp). - COLLAPSE
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    27 May 2026

  • Research Paper

    Evaluation of Silk Fibroin/Fish Vitreous Humor Hydrogel as a Potential Biomaterial for Corneal Regeneration
    Aynaz Sharifian, Esmaeil Biazar, Javad Esmaeili, Reza Zeinali, Saeed Heidari Keshel, Soheil Shokri, Azam Rahimi, Davood Zaeifi
    Corneal blindness is a significant cause of visual loss worldwide and its treatment poses substantial clinical and scientific challenges. Various strategies have … + READ MORE
    Corneal blindness is a significant cause of visual loss worldwide and its treatment poses substantial clinical and scientific challenges. Various strategies have been investigated to repair or regenerate damaged corneal tissue. In this study, a scaffold for epithelial cell growth and proliferation was developed using different ratios of silk fibroin (SF) and fish vitreous humor (VH), two natural biocompatible biomaterials. Hydrogels of pure SF, SF/VH (9:1), and SF/VH (1:1) were cross-linked with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and then characterized by infrared spectroscopy, optical transparency, swelling behavior, degradation profile, mechanical properties, and in vitro cell studies. Spectrophotometric analysis showed that scaffolds with higher SF content exhibited superior transparency and light transmission. Increasing the SF content also enhanced mechanical strength while reducing both swelling and degradation rates. Higher VH content improved elasticity and promoted cell adhesion, proliferation, and overall viability. Among the tested formulations, the SF/VH (9:1) hydrogel demonstrated the best balance of physicochemical, mechanical, and biological properties, indicating its strong potential as a scaffold for regenerating corneal epithelial tissue. - COLLAPSE
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    27 May 2026

  • Research Paper

    Growth Mechanism and Location Control of Black Phosphorus in Mineralizer-Assisted Synthesis

    미네랄라이저 보조 합성에서 흑린의 성장 메커니즘 및 위치 제어

    Yooyeon Jo

    조유연

    Since the first mechanical exfoliation of graphene in 2004, two-dimensional materials have been extensively studied due to their distinctive electrical and optical … + READ MORE
    Since the first mechanical exfoliation of graphene in 2004, two-dimensional materials have been extensively studied due to their distinctive electrical and optical properties combined with atomic-scale thickness. Black phosphorus has emerged as a promising two-dimensional material because of its thickness-dependent bandgap, relatively high carrier mobility, and intrinsic in-plane anisotropy. It was first synthesized in 1914 using high-pressure techniques involving several gigapascals. A mineralizer-assisted synthesis method was introduced in 2007, enabling growth under ambient pressure without the use of highly toxic reagents. Despite these advances, black phosphorus obtained by conventional methods is typically in bulk form and the growth mechanism in the ampoule remains unclear. In this study, the growth location and behavior of black phosphorus are investigated using a quartz ampoule-based mineralizer-assisted synthesis method. The growth location and morphology of black phosphorus are dependent on the experimental configuration, particularly the presence of mineralizer-related compounds and metal-coated substrates. We demonstrate that Sn-P-I compounds and metal-induced reactions can effectively control the growth location, and provide insights toward thin-film black phosphorus synthesis. - COLLAPSE
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    27 May 2026

  • Research Paper

    Optical Properties of Thermally Evaporated CsPbBr3-Based Symmetric and Asymmetric Multiple Quantum Wells

    열증착으로 형성된 CsPbBr3 페로브스카이트 기반 대칭 및 비대칭 다중양자우물(MQWs) 구조의 광특성 분석

    Kwang Jae Lee

    이광재

    Lead halide perovskite semiconductors have attracted significant attention because of their defect tolerance, tunable bandgap, and excellent optoelectronic properties. In this work, … + READ MORE
    Lead halide perovskite semiconductors have attracted significant attention because of their defect tolerance, tunable bandgap, and excellent optoelectronic properties. In this work, symmetric and asymmetric multiple quantum wells (MQWs) based on CsPbBr3 were fabricated using a thermal evaporation process, and their photoluminescence (PL) properties were systematically investigated. TPBi (2,2′,2″-(1,3,5-benzenetriyl)-tris(1-phenyl-1H-benzimidazole)) and BCP (bathocuproine) were employed as barrier materials to form Type I and Type II band alignments, respectively, resulting in distinct optical characteristics and carrier recombination behaviors in the MQW structures. Despite using the same CsPbBr3 material, the MQWs exhibited significantly different PL characteristics depending on the band alignment and structural configuration. In particular, asymmetric MQWs with Type I and Type II band alignments exhibited completely different carrier dynamics in temperature-dependent PL measurements. The Type I structures exhibited thermally activated carrier redistribution, whereas the Type II structures showed dominant energy funneling toward the lowest energy states. These results demonstrate that carrier dynamics and optical properties in perovskite MQWs can be effectively controlled by band alignment and structural asymmetry, providing a direct physical basis for designing quantum well-based optoelectronic devices. - COLLAPSE
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    27 May 2026

  • Research Paper

    Enhanced Electrochemical Performance of Thick LiFePO4 Electrodes via Mechanofusion-Assisted Dual Carbon Coating

    메카노퓨전 공정을 통한 이중 탄소 코팅된 LiFePO4 후막 전극의 전기화학적 성능 향상

    Un-Tae Kim, Myeong-Hun Jo, Hyo-Jin Ahn

    김운태, 조명훈, 안효진

    Lithium iron phosphate (LFP) is attracting attention for its low cost, excellent stability, and eco-friendliness. However, LFP has a relatively low theoretical … + READ MORE
    Lithium iron phosphate (LFP) is attracting attention for its low cost, excellent stability, and eco-friendliness. However, LFP has a relatively low theoretical capacity, operating voltage, and low electrical conductivity. To improve the disadvantages of LFP, LFP carbon coating technology is essential. In this paper, a double carbon coating was performed on LFP using a mechanofusion process. The synthesized carbon coating LFP was structurally analyzed, and the electrochemical performance was evaluated by manufacturing a thick electrode. The optimized composition, LFP@C5, exhibited the lowest charge transfer resistance (423 Ω), excellent rate performance of 21.3 mAh g-1 at 5.0 C, and an improved capacity retention of 29.4 % after 100 cycles at 1.0 C. LFP@C5 has a continuous conductive network within the electrode that reduces electrode/electrolyte interfacial resistance and improves electrochemical performance in the thick film electrode. As a result, the mechanofusion-based dual carbon coating strategy enhances the cycling stability and high-rate performance of thick LFP electrodes. - COLLAPSE
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    27 May 2026
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Journal Informaiton Korean Journal of Materials Research Korean Journal of Materials Research
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