• Title/Summary/Keyword: Sol-Gel Method

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Material Life Cycle Assessment of Graphene 2wt% Added to Li1.6Ni0.35Mn0.65O2 Half-Cell (그래핀 2wt%를 첨가한 Li1.6Ni0.35Mn0.65O2 Half-Cell의 물질 전 과정 평가)

  • CHO, KYOUNG-WON;LEE, YOUNG-HWAN;HAN, JEONG-HEUM;YU, JAE-SEON;HONG, TAE-WHAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.1
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    • pp.132-137
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    • 2020
  • Lithium secondary batteries have become an important power source for portable electronic devices such as cellular phones, laptop computers. Presently, commercialized lithium-ion batteries use a LiCoO2 cathode. However, due to the high cost and environmental problems resulting from cobalt, an intensive search for new electrode materials is being actively conducted. Recently, solid solution LiMn1-xNixO2 have become attractive because of high capacity and enhanced safety at high voltages over 4.5 V. The Li1.6Ni0.35Mn0.65O2 compounds were conventionally prepared by a sol-gel method, which can produce the layered Li-Ni-Mn-O compounds with a high homogeneity. And by adding a graphene 2wt% the first charge-discharge voltage profiles was increased over Li1.6Ni0.35Mn0.65O2 compound. Also, the variation s of the discharge capacities with cycling showed a higher capacity retention rater. In this study, material lifecycle evaluation was performed to analyze the environmental impact characteristics of Li1.6Ni0.35Mn0.65O2 & graphene 2wt% half-cell manufacturing process. The software of material life cycle assessment was Gabi. Through this, environmental impact assessment was performed for each process. The environmental loads induced by Li1.6Ni0.35Mn0.65O2 & graphene 2wt% synthesis process were quantified and analyzed, and the results showed that the amount of power had the greatest impact on the environment.

Preparation and Photosensitivity of Ag-Multi Walled Carbon Nanotube-TiO2 Nano Composite (Ag-Multi walled carbon nanotube-TiO2 복합나노소재 제조 및 광감응성)

  • Kim, Sung-Pil;Kim, Jong-Oh
    • Journal of the Korean GEO-environmental Society
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    • v.17 no.2
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    • pp.5-11
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    • 2016
  • $MWCNT-TiO_2$ nano composites and $Ag-MWCNT-TiO_2$ nano composites were prepared from Multi-Walled Carbon NanoTube (MWCNT), titanium (IV) butoxide (TNB) solution and silver nitrate ($AgNO_3$) by the sol-gel method. The dispersion and structure of Ag in the synthesized composites was observed by Scanning Electron Microscopy (SEM) and Field Emission Transmission Electron Microscopy (FE-TEM). X-Ray Diffraction (XRD) patterns of the composites showed that the composites contained an anatase phase. The Energy Dispersive X-ray spectroscopy (EDX) showed the presence of C, O, Ti and Ag peaks. The $TiO_2$ particles were distributed uniformly in the MWCNT network, and Ag particles were virtually fixed on the surface of the tubes. Also decomposition of the methylene blue was investigated according to UV radiation times for study photocatalytic activity. $Ag-MWCNT-TiO_2$ nano composites show high photodegradation than $MWCNT-TiO_2$ nano composites. The results indicate that the high conductivity of Ag improved the photoactivity of the $MWCNT-TiO_2$ composite.

Characteristics of Electrospun Ag Nanofibers for Transparent Electrodes (전기방사법으로 제조된 Ag 나노섬유의 투명전극 특성)

  • Hyeon, Jae-Young;Choi, Jung-Mi;Park, Youn-Sun;Kang, Jiehun;Sok, Junghyun
    • Journal of the Korean Vacuum Society
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    • v.22 no.3
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    • pp.156-161
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    • 2013
  • We fabricated transparent conductive electrodes with silver (Ag) nanofibers by electrospinning process. Ag nanofibers have high aspect ratio and fused junctions which result in low sheet resistance. Electrospinning is a fast and efficient process to fabricate continuous one-dimensional (1D) nanofibers. Ag/polymer ink were prepared in polymer matrix solution by a sol-gel method. Then, Ag/polymer nanofibers precursors are heated at $200{\sim}500^{\circ}C$ in air for 2 h to eliminate partially the polymers. The topographical features of the Ag nanofibers were characterized by FE-SEM, and the electrical property was analyzed through I-V measurement system. Finally, optical property was measured using UV/VIS spectroscopy. The transparent conductive electrodes with Ag nanofibers exhibited a sheet resistance (Rs) of $250{\Omega}/sq$ at a transparency (T) of 83%. Transparent conductive films, contain the Ag nanofibers as conductive materials, have good electrical, optical, and mechanical properties. Therefore, it is expected to be useful for the application of flexible display in the future.

Preparation of $SiO_2-TiO_2$ Porous Composite Pigments Using a Pickering Emulsion Method as Template (피커링 에멀젼을 형판으로 하는 $SiO_2-TiO_2$ 다공성 분체의 제조)

  • Lee, Sang-Gil;Kim, Young-Ho;Hong, Jun-Ki;Pyo, Hyeong-Bae;Lee, Dong-Kyu
    • Journal of the Korean Applied Science and Technology
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    • v.29 no.3
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    • pp.377-392
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    • 2012
  • It has been known that small solid particles act as a stabilizer in pickering emulsion system. In this study, we successfully prepared stable pickering emulsion in n-hexylalcohol and water system with $TiO_2$ whose surface was treated by alkylsilane. The optimum condition to prepare pickering emulsion stabilized by $TiO_2$ particles was determined by amount of $TiO_2$ particles and ratio of water and oil phase. The type of pickering emulsion was dependent on wettability of particles for water and n-hexylalcohol. When the amount of $TiO_2$ particles increased up to 5.00 wt%, the stability of pickering emulsion was showed to be improved. The most stable pickering emulsion was prepared in the case of W/O type which has the ratio of oil and water phase (3 : 7). We tried to prepare porous $SiO_2-TiO_2$ composite pigments using a pickering emulsion as template at the optimal condition. Porous pigments were synthesized with Ludox HS-30 as an inorganic material by sol-gel process. The characteristics and shape of porous pigments were measured by optical microscope, SEM, BET, XRD and EDS.

Surface Characteristics and Antifouling Performance of Inorganic MnOx-WO3-TiO2 Nanopowder for Self-polishing Copolymer Paint Applications (무기계 MnOx-WO3-TiO2 나노분말의 표면특성 및 자기마모형 수지 적용성 평가)

  • Shin, Byeongkil;Park, Hyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.22 no.2
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    • pp.253-258
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    • 2016
  • The $MnO_x-WO_3-TiO_2$ nanoscale powders were synthesized by sol-gel method in order to prevent the biological fouling on the ships and offshore structures. Powder characteristics and antifouling performance were investigated with respect to the crystalline, microstructure and surface property for application in self-polishing copolymer resins. The high antifouling activity of $TiO_2$-system biocide was attributed to its redox potential and soluble metal ions originating from tungsten oxides according to the improvements in the powder characteristics. Based on their physio-chemical characterizations, the specific surface areas of powders were about $90m^2/g$ and the grain size was in the region 100 ~ 150 nm. Powder characteristics and surface properties were improved by the addition of $WO_3$. Antifouling performance were analyzed according to their surface properties and static immersion tests to determine the effects of the $TiO_2$-system compounds. The surface of 2 wt. % added sample was clean for 5 month. This may be attributed to the ability of $MnO_x-WO_3-TiO_2$ powders to act as a promoter in antifouling agents.

Sol-gel Derived-highly Transparent c-axis Oriented ZnO Thin Films (졸-겔법에 의한 c-축 배향성을 가진 고투과율 ZnO 박막의 제조)

  • Lee, Young-Hwan;Jeong, Ju-Hyun;Jeon, Young-Sun;Hwang, Kyu-Seog
    • Journal of Korean Ophthalmic Optics Society
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    • v.13 no.1
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    • pp.71-76
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    • 2008
  • Purpose: A simple and efficient method to prepare nanocrystalline ZnO thin film with pure strong UV emission on soda-lime-silica glass substrates by low-temperature annealing was improved. Methods: Crystal structural, surface morphological, and optical characteristics of nanocrystalline ZnO thin films deposited on soda-lime-silica glass substrates by prefiring final annealing process at 300$^{\circ}C$ were investigated by using X-ray diffraction analysis, field emission-scanning electron microscope, scanning probe microscope, ultraviolet-visible-near infrared spectrophotometer, and photoluminescence. Results: Highly c-axis-oriented ZnO films were obtained by prefiring at 300$^{\circ}C$. A high transmittance in the visible spectra range and clear absorption edge in the ultra violet range of the film was observed. The PL spectrum of ZnO thin film with a deep near band edge emission was observed while the defect-related broad green emission was nearly quenched. Conclusions: Our work will be possibly adopted to cheaply and easily fabricate ZnO-based optoelectronic devices at low temperature, below 300$^{\circ}C$, in the future.

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Magnetic Properties of Cr-Doped Inverse Spinel Fe3O4 Thin Films (Cr 치환된 역스피넬 Fe3O4 박막의 자기적 특성)

  • Lee, Hee-Jung;Choi, Seung-Li;Lee, Jung-Han;Kim, Kwang-Joo;Choi, Dong-Hyeok;Kim, Chul-Sung
    • Journal of the Korean Magnetics Society
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    • v.17 no.2
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    • pp.51-54
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    • 2007
  • By substituting Cr in inverse-spinel $Fe_3O_4,\;Cr_xFe_{3-x}O_4$ thin film samples were prepared by sol-gel spin-coating method and their structural electronic, and magnetic properties were analyzed. X-ray diffraction indicates that the lattice constant decrease with increasing Cr composition (x). This result can be explained in terms of occupation of octahedral sites by $Cr^{3+}$ ions with smaller ionic radius than that of $Fe^{3+}$ Vibrating sample magnetometry measurements on the samples at room temperature revealed that saturation magnetization ($M_s$) decrease by Cr substitution, explainable by comparing spin magnetic moment among the related transition-metal ions. A decrease of magnetoresistence effect with x was observed, similar to that of $M_s$. The coercivity of the $Cr_xFe_{3-x}O_4$ films was found to increase with x, attributed to the increase of magnetic anisotropy by the existence of octahedral $Cr^{3+}(d^3)$.

The Multiferroic Properties Study of YMn2-xFexO5 (x=0.00, 0.01) by Neutron Diffraction (고 분해능 중성자 회절 실험에 의한 YMn2-xFexO5 (x = 0.00, 0.01)의 다강체 특성 연구)

  • Kim, Dong-Hyun;Kim, Chul-Sung
    • Journal of the Korean Magnetics Society
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    • v.17 no.5
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    • pp.183-187
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    • 2007
  • Compounds of multiferroic materials $YMn_{2-x}Fe_xO_5$ (x = 0.00, 0.01) were prepared using the sol-gel method. The crystallographic, magnetic and electric properties are studied using x-ray diffraction (XRD), neutron diffraction, vibrating sample magnetometer (VSM) and physical property measurement system (PPMS). The crystalline structure of $YMn_2O_5$ was found to be orthorhombic (Pbam) at room temperature. The lattice constants of $YMn_2O_5$ were determined to be $a_0=7.275\;{\AA},\;b_0=8.487\;{\AA},\;c_0=5.674\;{\AA}$. The lattice constants not changed with Fe concentrations. Our data demonstrate the correlation of magnetic and electric properties in $YMn_2O_5$ materials.

Electrochemical Study of Nanoparticle Li4Ti5O12 as Negative Electrode Material for Lithium Secondary Battery (리튬이차전지 음극재용 나노입자 Li4Ti5O12의 전기화학적 연구)

  • Oh Mi-Hyun;Kim Han-Joo;Kim Young-Jae;Son Won-Keun;Lim Kee-Joe;Park Soo-Gil
    • Journal of the Korean Electrochemical Society
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    • v.9 no.1
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    • pp.1-5
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    • 2006
  • Lithium titanium oxide $(Li_4Ti_5O_{12})$ with spinel-framework structures as anode material for lithium-ion battery was prepared by sol-gel and high energy ball milling (HEBH) method. According to the X-ray diffraction (XRD), Particle Size Analyses(PSA) and scanning electron microscopy (SEM) analysis, uniformly distributed $Li_4Ti_5O_{12}$ particles with grain sizes of 100 nm were observed. Half cells, consisting of $Li_4Ti_5O_{12}$ as working electrode and lithium foil as both counter and reference electrodes showed the high performance of high rate discharge capacity and 173 mAh/g at 0.2C in the range of $1.0\sim2.5 V$. Furthermore, the crystalline structure of $Li_4Ti_5O_{12}$ didn't transform during the lithium intercalation and deintercalation process.

The Study on the Catalytic Performance and Characterization of La0.9Sr0.1Cr0.7B0.3O3±δ (B=Mn, Ni, Fe, Ru) for High Temperature Water-gas Shift Reaction with Simuated Coal-derived Syngas (모사된 석탄가스화 합성가스를 이용한 La0.9Sr0.1Cr0.7B0.3O3±δ (B=Mn, Ni, Fe, Ru)의 수성가스전이반응 활성 및 특성에 관한 연구)

  • Lee, Seul-Gi;Kwak, Jaehoom;Sohn, Jung Min
    • Transactions of the Korean hydrogen and new energy society
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    • v.24 no.6
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    • pp.543-549
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    • 2013
  • In this study, $La_{0.9}Sr_{0.1}Cr_{0.7}M_{0.3}O_{3{\pm}{\delta}}$ (M=Mn, Ru, Fe, Ni) were prepared by sol-gel method and water gas shift reaction with simulated coal-derived syngas between $400{\sim}650^{\circ}C$ was conducted to evaluate the catalytic activity of prepared catalysts. Physico-chemical properties were characterized by XRD, BET, SEM-EDS and TPR. The formation of perovskite crystallite, $LaCrO_3$ was confirmed and the highest surface area was measured with $La_{0.9}Sr_{0.1}Cr_{0.7}Mn_{0.3}O_{3{\pm}{\delta}}$. Equilibrium conversion of CO above $550^{\circ}C$ was achieved except $La_{0.9}Sr_{0.1}Cr_{0.7}Fe_{0.3}O_{3{\pm}{\delta}}$. and methanation reaction was carried out as side reaction of water gas shift reaction with $La_{0.9}Sr_{0.1}Cr_{0.7}Ni_{0.3}O_{3{\pm}{\delta}}$ and $La_{0.9}Sr_{0.1}Cr_{0.7}Ru_{0.3}O_{3{\pm}{\delta}}$. Conclusively, $La_{0.9}Sr_{0.1}Cr_{0.7}M_n{0.3}O_{3{\pm}{\delta}}$ was the most suitable catalyst of water gas shift reaction above $500^{\circ}C$ for CO conversion and hydrogen production.