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P-896 : Surface Modification of Mesoporous Silica via Dehydroxylation Route
임정은,김지만,심창보,이분열 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Since researchers at Mobil Company reported the syntheses of mesoporous silicas such as MCM-41 and MCM-48, there have been lots of developments in their synthesis, structural characterization and modification with various inorganic or organic functional groups. Most popularly, the organically modified mesoporous silicas can be prepared via post-grafting technique. However, post-grafting method is too easy cleavage of the Si-O-C bonds during applications and the loss of functionality. We propose a novel strategy for modification of mesoporous silica surface via a dehydroxylation route using Grignard reagent. The route gives not only the formation of a direct Si-C bond, which is much stronger in hydrolytic cleavage, but also preclusion from the formation of both surface bound oligomers and variable modes of attachment.
김현철,이세엽,심창보,Hyun-Cheol Kim,Se-Youp Lee,Chang Bo Shim 대한안과학회 2005 대한안과학회지 Vol.46 No.2
Purpose: To prospectively evaluate the clinical results of iris-fixed phakic intraocular lens (IOL) implantation (Artisan? implantation) in patients with high myopia. Methods: Eighteen eyes of 10 patients underwent Artisan? implantation between December 2001 and February 2003 and were followed up for more than 6 months. The study prospectively analyzed the efficacy, safety and predictability of Artisan? implantation based on visual acuity and refractive errors. Results: The preoperative mean uncorrected visual acuity (UCVA) was 0.02, and mean spherical equivalent refraction was -9.98D. Postoperative uncorrected vision was more than 0.5 in 83.3% of the eyes at 1 month and in 100% after 3 months. Also it was more than 0.9 in 22.2% of the eyes at 1 month, in 50.0% at 3 months and in 88.9% at 6 months. The spherical equivalent refraction after surgery was within 0.5D of emmetropia in 77.8% of eyes at 1 month, in 94.4% at 3 months and in 100% at 6 months. Also it was within 1.0D of emmetropia in 94.4% at 1 month and in 100% after 3 months. Complications included temporary glare or halo in 3 eyes, transient elevation of intraocular pressure in 1 eye, and decentration of IOL due to incomplete iris-fixation in 1 eye. Conclusions: Because of its good visual results and rare complications, the Artisan? implantation may be an effective surgical procedure for patients who cannot undergo laser in situ keratomileusis (LASIK).