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나노 실리카의 분무건조를 이용한 중공구 입자 제조와 실리카중공구의 열전달 특성
윤찬기,임형미,차수진,김대성,이승호,Youn, Chan Ki,Lim, Hyung Mi,Cha, Sujin,Kim, Dae Sung,Lee, Seung-Ho 한국재료학회 2012 한국재료학회지 Vol.22 No.10
Hollow silica spheres were prepared by spray drying of precursor solution of colloidal silica. The precursor solution is composed of 10-20 nm colloidal silica dispersed in a water or ethanol-water mixture solvent with additives of tris hydroxymethyl aminomethane. The effect of pH and concentrations of the precursor and additives on the formation of hollow sphere particles was studied. The spray drying process parameters of the precursor feeding rate, inlet temperature, and gas flow rate are controlled to produce the hollow spherical silica. The mixed solvent of ethanol and water was preferred because it improved the hollowness of the spheres better than plain water did. It was possible to obtain hollow silica from high concentration of 14.3 wt% silica precursor with pH 3. The thermal conductivity and total solar reflectivity of the hollow silica sample was measured and compared with those values of other commercial insulating fillers of glass beads and $TiO_2$ for applications of insulating paint, in which the glass beads are representative of the low thermal conductive fillers and the $TiO_2$ is representative of infrared reflective fillers. The thermal conductivity of hollow silica was comparable to that of the glass beads and the total solar reflectivity was higher than that of $TiO_2$.
기계적 혼합과 고상법에 의해 합성한 LiNi<sub>1-y</sub>Ga<sub>y</sub>O<sub>2</sub>의 전기화학적 특성
김훈욱,윤순도,이재천,박혜령,박찬기,송명엽,Kim, HunUk,Youn, SunDo,Lee, JaeCheon,Park, HyeRyoung,Park, Chan-Gi,Song, MyoungYoup 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.9
$LiNi_{1-y}Ga_yO_2$ (y = 0.005, 0.010, 0.025, 0.050, and 0.100) were synthesized by the solid-state reaction method after mechanical mixing, and their_electrochemical properties were investigated. All the $LiNi_{1-y}Ga_yO_2$ (y=0.005, 0.010, 0.025, 0.050, and 0.100) samples had the R3m structure. The sample with y = 0.025 showed the largest first discharge capacity (131.4 mAh/g) and good cycling performance [discharge capacity 117.5 mAh/g ($89.4{\%}$ of the first discharge capacity) at the 20th cycle]. The first discharge capacity decreased as the value of y increased. The samples with y = 0.010 and y = 0.005 had small R-factor but their cycling performance was worse than that of the sample with y = 0.025. All the $LiNi_{1-y}Ga_yO_2$ samples had smaller discharge capacities than $LiNiO_2$, but their cycling performances were better than that of $LiNiO_2$.
기계적 혼합과 고상법에 의해 합성한 LiNi1-yInyO2의 전기화학적 특성
김훈욱,윤순도,박혜령,송명엽,이재천,박찬기 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.1
By calcining at 750 ℃ for 30 h in O2 stream after milling, LiNi1-yInyO2(y = 0.005, 0.01, 0.025, 0.05, and 0.1) were synthesized and their electrochemical properties were investigated. All the samples had the Rm structure. In addition, they contained LiInO2 phase and the intensities of the peaks for the LiInO2 phase increased as the value of y increased. The sample with y = 0.01 had the largest first discharge capacity (140.2 mAh/g), but the sample with y = 0.005 had a better cycling performance. The samples with y 0.025 had a bad cycling performance irrespective of the first discharge capacity. The sample with y = 0.005 had the largest value of I003/I104 and the smallest value of R-factor. Among all the samples, LiNi00.995In0.005O2 had the best electrochemical properties. This sample had a smaller first discharge capacity than LiNiO2, but it showed a better cycling performance than LiNiO2.
기계적 혼합과 고상법에 의해 합성한 LiNi1-yGayO2의 전기화학적 특성
송명엽,박혜령,윤순도,김훈욱,이재천,박찬기 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.9
LiNi1-yGayO2 (y=0.005, 0.010, 0.025, 0.050 and 0.100) were synthesized by the solid-state reaction method after mechanical mixing, and their electrochemical properties were investigated. All the LiNi1-yGayO2 (y=0.005, 0.010, 0.025, 0.050 and 0.100) samples had the Rm structure. The sample with y=0.025 showed the largest first discharge capacity (131.4mAh/g) and good cycling performance [discharge capacity 117.5mAh/g (89.4% of the first discharge capacity) at the 20th cycle]. The first discharge capacity decreased as the value of y increased. The samples with y=0.010 and y=0.005 had small R-factor but their cycling performance was worse than that of the sample with y=0.025. All the LiNi1-yGayO2 samples had smaller discharge capacities than LiNiO2, but their cycling performances were better than that of LiNiO2. 기계적 혼합과 고상법에 의해 LiNi1-yGayO2 (y=0.005, 0.010, 0.025, 0.050 and 0.100)를 합성하고 전기화학적 특성을 조사하였다. LiNi1-yGayO2 (y=0.005, 0.010, 0.025, 0.050, and 0.100)의 모든 시료들은 Rm 구조의 상을 형성하였다. Ga가 y=0.025 치환된 경우 가장 높은 초기방전용량(131.4mAh/g)을 보여주었으며 20번째 싸이클에서 방전용량은 117.5mAh/g으로 초기방전용량의 약 89.4%이었다. Ga의 치환량이 증가함에 따라 초기방전용량의 감소가 뚜렷하였으며 Ga가 y=0.01과 y=0.005 치환된 경우 R-factor 값이 낮았지만 싸이클 성능이 Ga가 y=0.025 치환된 경우보다 좋지 않았다. Ga를 치환한 모든 조성에서 초기방전용량은 LiNiO2보다 줄어들었지만 싸이클 성능은 향상되었다.
원종필 ( Won Jong Pil ),박찬기 ( Park Chan Gi ),윤종환 ( Yoon Jong Han ),황금식 ( Hwang Kum Sik ),조용진 ( Cho Yong Jin ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
The corrosion of steel reinforcing bar(re-bar) has been the major cause of the reinforced concrete deterioration. FRP(Fiber-reinforced polymer) reinforcing bar has emerged as one of the most promising and affordable solutions to the corrosion problems of steel reinforcement in structural concrete. In this study, long-term durability performance of FRP re-bar were evaluated. The mechanical and durability properties of two type of CFRP- and GFRP re-bar were investigated; the FRP re-bars were subjected to alkaline solution, acid solution, salt solution and deionized water. The mechanical and durability properties were investigated by performing tensile and short beam tests. Experimental results confirmed the desirable resistance of FRP re-bar to aggressive chemical environment.