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RISS 인기검색어
- 검색키워드
- 저자 : Tulchinsky, Y. (검색결과 2 건)
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Is iron unique in promoting electrical conductivity in MOFs?
Sun, L.,Hendon, C.,Park, S.,Tulchinsky, Y.,Wan, R.,Wang, F.,Walsh, A.,Dinca, M. Royal Society of Chemistry 2017 Chemical Science Vol.8 No.6
<P>Identifying the metal ions that optimize charge transport and charge density in metal-organic frameworks is critical for systematic improvements in the electrical conductivity in these materials. In this work, we measure the electrical conductivity and activation energy for twenty different MOFs pertaining to four distinct structural families: M-2(DOBDC)(DMF)(2) (M = Mg2+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+); H4DOBDC = 2,5-dihydroxybenzene-1,4-dicarboxylic acid; DMF = N, N-dimethylformamide), M-2(DSBDC)(DMF)(2) (M = Mn2+, Fe2+; H4DSBDC = 2,5-disulfhydrylbenzene-1,4-dicarboxylic acid), M2Cl2(BTDD)(DMF)(2) (M = Mn2+, Fe2+, Co2+, Ni2+; H2BTDD = bis(1H-1,2,3-triazolo[4,5-b],[40,50-i]dibenzo[1,4]dioxin), and M(1,2,3-triazolate)(2) (M = Mg2+, Mn2+, Fe2+, Co2+, Cu2+, Zn2+, Cd2+). This comprehensive study allows us to single-out iron as the metal ion that leads to the best electrical properties. The iron-based MOFs exhibit at least five orders of magnitude higher electrical conductivity and significantly smaller charge activation energies across all different MOF families studied here and stand out materials made from all other metal ions considered here. We attribute the unique electrical properties of iron-based MOFs to the high-energy valence electrons of Fe2+ and the Fe3+/2+ mixed valency. These results reveal that incorporating Fe2+ in the charge transport pathways of MOFs and introducing mixed valency are valuable strategies for improving electrical conductivity in this important class of porous materials.</P>
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Facial Nerve Repair following Acute Nerve Injury
Ehud Fliss,Ravit Yanko,Arik Zaretski,Roei Tulchinsky,Ehud Arad,Daniel J. Kedar,Dan M. Fliss,Eyal Gur 대한성형외과학회 2022 Archives of Plastic Surgery Vol.49 No.4
Background Acute facial nerve iatrogenic or traumatic injury warrants rapid management with the goal of reestablishing nerve continuity within 72 hours. However, reconstructive efforts should be performed up to 12 months from the time of injury since facial musculature may still be viable and thus facial tone and function may be salvaged. Methods Data of all patients who underwent facial nerve repair following iatrogenic or traumatic injury were retrospectively collected and assessed. Paralysis etiology, demographics, operative data, postoperative course, and outcome were examined. Results Twenty patients underwent facial nerve repair during the years 2004 to 2019. Data were available for 16 of them. Iatrogenic injury was the common category (n¼13, 81%) with parotidectomy due to primary parotid gland malignancy being the common surgery (n¼7, 44%). Nerve repair was most commonly performed during the first 72 hours of injury (n¼12, 75%) and most of the patients underwent nerve graft repair (n¼15, 94%). Outcome was available for 12 patients, all of which remained with some degree of facial paresis. Six patients suffered fromcomplete facial paralysis (50%) and three underwent secondary facial reanimation (25%). There were no major operative or postoperative complications. Conclusion Iatrogenic and traumatic facial nerve injuries are common etiologies of acquired facial paralysis. In such cases, immediate repair should be performed. For patients presenting with facial paralysis following previous surgery or trauma, nerve repair should be considered up to at least 6 months of injury. Longstanding paralysis is best treated with standard facial reanimation procedures.
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