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Modified Sol-Gel Processing for Titanium Disulfide
고용복,배영제,채희권,Go, Yong Bok,Bae, Young Je,Chae, Hee K. Korean Chemical Society 1997 대한화학회지 Vol.41 No.3
육방형 이황화 티탄늄의 분말과 박막을 졸-겔법을 변형시켜 제조하였다. 여러 가지 용매하에서 이소프로폭시화 티탄늄과 황하 수소와의 반응에 의해 전구체의 침전을 유도한 후 이것을 황화 수소 분위기에서 열처리를 하면 분말이 얻어지는 반면 2-메톡시에톡시화 티탄늄과의 반응은 안정한 전구체 용액을 주므로 이것을 스핀 코팅하여 열처리하면 박막을 얻을 수 있다. 이러한 분말과 박막의 형태 변화를 열처리를 하면서 전자 현미경과 분말 X-선 회절기를 통해 살펴보았다. Powders and thin-layers of a hexagonal titanium disulfide phase have been successfully prepared by modifying the sol-gel process. The reaction of titanium isopropoxide with hydrogen sulfide causes the precipitation of a precursor which was converted to the disulfide on heat-treatment in $H_2S$ at various temperatures depending on the solvent adopted, whereas that of titanium 2-methoxyethoxide with $H_2S$ produces a stable solution which was spin-casted onto silicon substrates followed by thermolysis to give thin films. Upon heat-treatment in $H_2S$, the disulfides show interesting morphological variations in the form of their powders and thin films, which were characterized by SEM and X-ray diffractometer.
만성 신부전 환자에서 혈액 투석을 위한 PTFE Graft를 이용한 Arteriovenous Fistula의 임상경험
고용복,유영경 대한혈관외과학회 1990 Vascular Specialist International Vol.6 No.1
Angioaccess for maintenance hemodialysis of chronic renal failure patient was very important for life saving. The expanded polytetrafluoroethylene (PTFE) tubular prosthesis is gaining acceptance as an alternative when primary arteriovenous fistula can not provide vascular access for chronic hemodialysis. The clinical experience in 112 PTFE grafts is reviewed in KangNam St. Marys Hospital in a period of 6 year and 5 month (from January, 1984 to May, 1990). The results were as follows: 1) 112 PTFE graft arteriovenous fistulas were constructed at 95 chronic renal failure patient for hemodialysis. The age distribution of 95 patients showed that 33.7%, occurred on 5th decade and the male-female ratio was 1: 1.37. 2) Anatomical site of PTFE graft arteriovenous fistula showed as follows at forearm; 54.5%, at upper arm: 28.6% at thigh; 13.4g, at anterior upper chest: 3.6%,. 3) The complications of the PTFE graft arteriovenous fistula were thrombotic occlusion due to forceful hemostasis after hemodialysis (85%), graft infection (9%.) and hematoma (6%). 4) The mean survival of PTFE graft arteriovenous fistula was 21.5 months. For the purpose of improvement of survival, hemodialysis followed by hemostasis with light pressure that allow adequate blood flow to graft arteriovenous fistula would be essential.