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초임계 증착법을 통한 실리카와 타이타니아 역 오팔의 제조
유혜민(Hye Min Yu),임종성(Jong Sung Lim) 한국청정기술학회 2012 청정기술 Vol.18 No.1
정보 전달의 수단으로의 빛을 제어하는 기술에 대한 연구가 활발한 가운데, 최근 가장 각광 받고 있는 것이 광결정(Photonic crystals)을 갖는 물질이다. 이를 합성하는 다양한 방법 중에서 초임계 증착법(Supercritical deposition)을 사용하면, 복잡한 내부 구조물까지의 반응물의 침투가 용이하여 신속하고 효율적인 공정이 가능하다. 본 논문에서는 비독성, 비인화성 등으로 친환경 초임계 용매인 초임계 이산화탄소(Supercritical carbon dioxide) 분위기 하에서 고분자 콜로이드 주형에 금속 알콕사이드를 코팅하는 방법으로 매크로 기공을 갖는 역 오팔(Inverse opals) 구조물을 합성하였다. 반응온도와 압력은 40 ℃와 80bar로 고정하였으며, 반응 시간과 반응물의 비율을 조절하여 역 오팔의 구조의 변화를 살펴보았다. 실험에는 금속 알콕사이드로써 Tetraethyl orthosilicate (TEOS)와 Titanium (IV) isopropoxide (TTIP)가 사용되었으며, 각각을 통하여 실리카와 타이타니아 역 오팔을 합성할 수 있었다. Photonic crystals (PCs) are highly ordered porous materials which have been much attention because of its potential for controlling the light sauces. There are many methods for synthesizing this kind of materials among them we chose the supercritical deposition. With this method the reactants can easily infiltrate into the complex structure. In this paper, supercritical carbon dioxide (scCO₂) was used as a reaction medium, which is known as a sustainable solvent due to its nontoxic and noninflammable characteristics. We coated the colloidal template with metal alkoxide by using scCO₂ and then obtained macro-porous inverse opals. The reaction was carried out at 40 ℃ and 80 bar. We synthesized two different inverse opals which called silica and titania inverse opals by use of tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TTIP) as a precursor, respectively.
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우측 대장에 국한된 허혈성 대장염은 불향한 예후의 예측인자 인가?
전형구 ( Hyung Ku Chon ),박경택 ( Kyung Taek Park ),정종환 ( Jong Hwan Chong ),정범수 ( Beon Su Jeong ),유혜민 ( Hye Min Yu ),안대선 ( Dea Sun An ),윤해은 ( Hae Eun Youn ),김선민 ( Sun Min Kim ),양희찬 ( Hee Chan Yang ),이수택 전북대학교 의과학연구소 2010 全北醫大論文集 Vol.34 No.1
Background/Aims: Ischemic colitis is a medical condition in which inflammation and injury of the large intestine result from inadequate blood supply. In general, the patients with ischemic colitis have a wide spectrum of severity; most of them are treated supportively and then recovered fully, while a minority of them in critical condition may develop sepsis and become severely ill. But, there have been few studies analyzing the factors associated with poor prognosis in ischemic colitis. As the blood supply of colon, we suppose that when ischemia affects the right side of the colon in an isolated fashion, the prognosis may not be so favorable. After comparison between isolated right colon ischemia and the others, we would recognize the clinical meaning of that and doubt whether significant factor related to the prediction of poor prognosis. Methods and Materials: Patients with ischemic colitis were enrolled in a retrospective study at Chonbuk National University Hospital during interval January 2003 to June 2009. They were identified using computerized searches of ICD-9 codes for colon ischemia, that were diagnosed by colonoscopy( or sigmoidoscopy), MDCT (multidirectional computed tomography). And then, divided into two groups, one with isolated right colon ischemia (IRCI) and the other with colon ischemia not involving the right colon in an isolated fashion (non-IRCI). We analyzed age, gender, underlying diseases [e.g diabetis mellitus, hypertension, chronic kidney disease, arrhythmia(atrial fibrillation or atrial flutter), cerebral vascular disease, ischemic heart disease, previous cancer history, abdominal operation history], clinical symptoms and signs, blood test (hemoglobin, white blood cell count and basic biochemical profile) , CT findings, treatment and mortality. Results: A total 89 patients were identified colon ischemia. IRCI group was composed of 18 patients (11 females and 7 males, average age of 66.83±2.81). The mortality of patients with IRCI was 27.8% compared with a mortality of 1.4% in patients with non-IRCL(p=0.001) Moreover, they had a more underlying DM (44.4% vs 31.0%. p=0.281), hypertension (61.1% vs 36.6 %, p=0.060), vascular disorder(IHD or CVA) (27.8% vs 15.5%, p=0.225), previous cancer history (27.8% vs 18.3%, p=0.372), previous abdomen operation history (50.5% vs 11.3%, p=0.003) than non-IRCI group. Arrival at hospital, IRCI group had more abdominal pain (94.4% vs 81.7%, p=0.184) and tenderness (88.9% vs 63.4%, p=0.037), more frequency of fever, chills(33.3% vs 14.1 %, p=0.057), and higher heart rate (93.77±5.63 vs 83.07 ±1.81, p=0.021) but less diarrhea (27.8% vs. 29.6%, P =0.881), hematochezia (44.4% vs. 52.1%, P =0.561) and lower hemoglobin level (11.28±0.52 vs 12.63 ±0.21, p=0.008) compared with non IRCI group. Among CT findings, wall thickening (80.0% vs. 20.0% p =0.012), attenuation (27.8% vs. 5.0% p=0.005), enhancement (27.8% vs 5.0%, p=0.005) and thrombosis/porto-mesenteric gas (44.4% vs. 3.3% p =.001) were significantly different between two groups. Hospital duration of IRCI group was longer (17.94±6.08 vs 13.93± 1.92, p=0.413) and more recurrence(22.2% vs 9.9% p=0.155) than non IRCI group. During admission, 4 patients(22.2%) of IRCI group suffered from abdomen operation for their appropriate treatment; but 2 patients(2.8%) of non IRCI group did.(p=0.014) Odds ratio for mortality and surgery with IRCI compared With Non-IRCI is 26.9 (95% CI=2.9~249.7,p=0.001), 9.857 (95% CI= 9.6~59.2,p=0.014), respectively Conclusions: Patients with IRCI significantly undergone more surgery and had a higher mortality. Although statistically meaningless, they had a higher recurrence rate and longer hospital stay.
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