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활성탄소에 담지된 백금나노입자의 전기화학적 거동에 대한 그라파이트 나노섬유 첨가효과
조원빈 ( Won Bin Jo ),오미순 ( Mi Soon Oh ),김주현 ( Ju Hyun Kim ),김석 ( Seok Kim ) 한국화학공학회 2010 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.48 No.6
본 연구에서는 탄소지지체로 활성탄소를 주요재료로 사용하고 여기에 그라파이트 나노섬유(graphite nanofibers)를 함량별로 혼합시킨 후, 백금전구체를 포함하는 용액에 분산시키고, 화학적인 환원반응을 통해서 백금입자를 담지하여 제조하였다. 첨가하는 GNF의 함량을 조절하면서, 백금입자의 결정 크기와 담지함량을 제어할 수 있었다. GNF 함량이 15 wt%인 혼합지지체를 사용한 백금입자의 경우, 최대의 전기활성 특성을 나타내었다. 또한, GNF 함량을 0%에서 15%로 증가시킴에 따라 전기전도도가 10-4 S/cm에서 10-1 S/cm로 증가하였다. 첨가제 GNF를 10%까지 도입한 경우, 백금입자의 전기활성은 크게 증가하는 경향을 보이지만, 15%에서는 그 증가경향이 작아져서 포화되는 현상이 보였다. 이런 결과는 전기활성도의 변화가 혼합지지체의 전기전도도 변화와 백금이 담지된 함량, 그리고, 담지형태와 관련성이 있음을 알 수 있었다. In the present study, mixed carbon-supported platinum (Pt) nanoparticles were prepared by a chemical reduction method of Pt precursor solution on two types of carbon materials such as activated carbons (ACs) and graphite nanofibers (GNFs). Average crystalline sizes and loading levels of Pt metal particles could be controlled by changing a content of GNFs. The highest electroactivity for methanol oxidation was obtained by preparing the carbon supports having 15 wt% GNFs. Furthermore, with an increase of GNFs content from 0% to 15%, an electrical conductivity was changed from 10-4 S/cm to 10-1 S/cm. By an introduction of 10 wt% GNFs additive, the electroactivity of platinum particles was enhanced, but was saturated in the case of 15 wt% GNFs contents. This was related with the fact that the electroactivity change was dependent on the electrical conductivity of mixed carbon supports and Pt particle deposition content or deposition morphology.
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경미한 외상을 받은 소아,청소년 환자의 지연 진단에 대한 고찰
최지안 ( Jee Ahn Choi ),박원빈 ( Won Bin Park ),김진주 ( Jin Joo Kim ),조진성 ( Jin Sung Jo ),김재광 ( Jae Kwang Kim ),임용수 ( Yong Su Lim ),현성열 ( Sung Youl Hyun ),정호성 ( Ho Seong Jeong ),양혁준 ( Hyuk Jun Yang ),이근 ( Gun 대한외상학회 2009 大韓外傷學會誌 Vol.22 No.2
Purpose: To analyze delayed diagnosis, we collected date on pediatric and adolescent patients who had been admitted to the Emergency Department with injuries due to minor trauma. Methods: We retrospectively analyzed the age distribution, trauma mechanism, time interval for each affected body region at delayed diagnosis, hospital stay, and outcome for 161 pediatric and adolescent patients who had been admitted to the Emergent Department of Gachon University Gil Hospital from January 2006 to September 2008. Results: The incidence of delayed diagnosis in pediatric and adolescent trauma was 11.8% in our retrospective review of 161 pediatric and adolescent patients. Lengths of hospitalization were longer in patients with delayed diagnosis (p<0.05). Patients with delayed diagnosis were more often transferred to other hospitals than patients with non-delayed diagnosis (p<0.05). The time intervals for each different affected body regions at delayed diagnosis were significantly different, but the hospital stays were not. There were no statistical significance to age on affected body region. Conclusion: From this study, we found that admission result and hospital stay were statistically significant differences between the delayed-diagnosis patient group and the non-delayed-diagnosis patient group. Finally, we must follow up pediatric and adolescent patients with minor trauma, closely considering missed injuries. (J Korean Soc Traumatol 2009;22:212-7)
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