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TEOS-TMB-H2O 계로부터 SiO2-B2O3 막제조에 관한 연구
조인경(In Kyoung Cho),강태범(Tae Bum Kang),이현경(Hyun Kyung Lee) 한국공업화학회 2002 공업화학 Vol.13 No.1
다공성 SiO_2-B_2O_3 막을 졸겔법에 의해서 Si(OC_2H_5)_4-(CH_3O)_3B-H_2O-C_2H_5OH 계로부터 제조하고 막의 특성을 XRD, IR, BET, TG-DTA, SEM, TEM을 사용하여 조사하였다. 괴상의 다공성 SiO_2-B_2O_3 막 제조를 위한 Si(OC_2H_5)_4 : (CH_3O)_3B : H_2O : C_2H_5OH의 최적 몰비는 1:0.11:5.385:5.385 이었다. Si(OH_4)와 B(OH)_3는 400℃ 이하에서 생성되고 SiO_2-B_2O_3는 500℃ 이상에서 생성되었다. 25 ℃~800 ℃ 온도범위에서 얻어진 건조 겔체는 평균 기공직경이 0.0034 ㎛~0.0052㎛이고 표면적은 244.478 ㎡/g~648.138 ㎡/g이었으며, 입자의 크기는 7㎚~35㎚인 무정형의 다공체이었다. A porous borosilicate membrane was prepared from Si(OC_2H_5)_4-(CH_2O)_3B-H_2O-C_2H_5OH system by sol-gel method. In order to investigate the characteristics of this membrane, the analytical methods such as X-ray diffractometer, IR spectrophotometer, BET, TG-DTA, SEM and TEM have been utilized, for porous borosilicate membrane, the optimum mole ratio of Si(OC_2H_5)_4 : (CH_3O)_3B : H_2O : C_2H_5OH was 1:0.11:5.385:5.385. Most of borons in the gels dried at room temperature were considered to be of boric acid forms, since they were hydrogen bonded to the silica network. In the 100 ℃~500 ℃ range, however, some of the boric acids were condensed with the silica frame work to form terminal =B-O-Si≡. Above 500 ℃, the condensation proceeded further and boron was fully incorporated into the frame work of =B-O-Si≡. Therefore, the porous borosilicate membrane was obtained by the heat treatment of the gel above 500 ℃. In the 25 ℃~800 ℃ range, the surface area of sintered gel was between 244.478 ㎡/g~648.138㎡/g; the median pore diameter was between 0.0034 ㎛~0.0052 ㎛; and the particle size of sintered gel was between 7㎚ ~35 ㎚.
姜泰範 상명대학교 논문집 1986 상명대학교논문집 Vol.17 No.-
With the purpose to obtain Γ-MnO_2 by transforming MnSO_4 · H_20, MnSO_4 · H_2O was calcined at various temperatures for 4 hours and then treated with differently diluted HNO_3 solutions. The results obtained were as follows: When MnSO_4 · H_2O was heated in air, MnSO_4 was produced at 260℃~300℃, and MnO, Mn_2O_3 and Mn_3O_4 were produced at 780℃-960℃. When Mn_3O_4 was treated with 60% nitric acid for 2hours at 100℃, Γ-MnO_2 was obtained.
tert-Butaol/Water 혼합용매에서 Solvated Electron과 AgClO4 반응의 반응속도에 관한 연구(제 1보)
姜泰範,李玄京 상명대학교 기초과학연구소 1998 기초과학연구 Vol.11 No.-
The reactivity of solvated electron(es-) with s cavenger(AgClO4) was s tudied in tert- butanol/water mixed solvents as a function of solvent compos ition and temperature. The reaction rate constant(k2) of solvated electron(es-) with AgClO4 correspond to (es- + Ag+) reaction in tert- butanol/water mixed solvent. The reaction of (es- + Ag+) in the water rich region is nearly diffus ion controlled reaction. For the reaction of solvated electron (es- + Ag+) with AgClO4 in tert- butanol/water mixed solvents , the activation energies (E2) of (es- + Ag+) reaction decrease as water is added to alcohol.
姜泰範 상명대학교 논문집 1984 상명대학교논문집 Vol.13 No.-
When γ-MnO_2 and β-MnO_2 was heated, transition process and range of transition temperature was as follows; γ-MnO_2?? β-MnO_2?? Mn_2O_3?? Mn_3O_4, and β-MnO_2?? Mn_2O_3?? Mn_3O_4
다공성 실리카막에 의한 C_3H_6-N_2 혼합기체분리
강태범 상명대학교 자연과학연구소 2001 自然科學硏究 Vol.8 No.-
The porous silica glass was prepared from Si(OC_2H_5 )_4 -H_2O system by sol- gel method. The performance of the porous silica membrane was investigated for the separation C3H6/N2 gas mixture. The real separation factor (α) and ideal separat ion factor (α^* ) decreased as the pressure and t emperature increased.
돈도와(溫度) 조성의(組成) 함수로서(函數) 1-Propanol/Water 혼합용액의(混合溶液) 점도와(粘度) 밀도(密度)( 제 2보 )
강태범,이현경 상명대학교 자연과학연구소 1998 自然科學硏究 Vol.5 No.-
Viscosity and density of 10 binary mixtures of 1-propanol with water were measured at 278.2≤T/K≤338.2 and the results summarized using polynomials in temperature. The excess dynamic viscosity( E) was large and positive in all cases.
tert-Butanol/Water 혼합 용매에서 Solvated Electron(es-)과 Scavenger(CuSO4)의 반응성에 관한 연구(제 1보)
강태범,이현경 상명대학교 자연과학연구소 1998 自然科學硏究 Vol.5 No.-
The reactivity of solvated electron(es-) with CuSO4 was studied in tert-butanol/water mixed solvents as a function of solvent composition and temperature. For the solvated electron(es-) and CuSO4 reaction the compositions were : Xw = 1.00, 0.98, 0.97, 0.94, 0.90. Lower water contents were not used because CuSO4 was not sufficiently soluble. The reactivity of solvated electron(es-) with CuSO4 is dependent on the electron affinnity for the scavenger(CuSO4), the solvent structure, the solvent-electron, and scavenger-solvent interactions. The reaction of solvated electrons(es-) with copper ions are strongly dependent on the properties of solvent. The reaction rate constant(k2) of solvated electron with CuSO4 correspond to (es- + Cu2+) reaction in tert-butanol /water mixed solvents. The values of the rate constants of the reactions of es- with scavenger (CuSO4) are 2.71∼3.71( 107m3/mol·s) in tert-butanol /water of the region 0.90 Xw 1.00 at 298.15K.