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Supercapacitive behavior of mesoporous carbon CMK-3 in calcium nitrate aqueous electrolyte
Heming Luo,Deyi Zhang,Liwen Zheng,Longyan Lei,Jingxiang Wu,Jian Yang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4
Calcium nitrate Ca(NO3)2 aqueous solution was found to be an effective aqueous electrolyte for a supercapacitorusing ordered mesoporous carbon as the electrode materials. The supercapacitive behavior of ordered mesoporouscarbon CMK-3 electrode in Ca(NO3)2 aqueous electrolyte was investigated utilizing cyclic voltammetry (CV),electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge measurements. CMK-3 electrodeshows excellent supercapacitive behavior with wide voltage window, high specific gravimetric capacitance and satisfactoryelectrochemical stability in Ca(NO3)2 aqueous electrolyte. The specific gravimetric capacitance of CMK-3 electrodein Ca(NO3)2 aqueous electrolyte reaches 210 F g−1 at a current density of 1 A g−1, which is higher than that in conventionalaqueous electrolytes NaNO3 and KOH solution about 40% and 54%, respectively. The high charge density of the electricdouble layer formed at the interface of the CMK-3 electrode and Ca(NO3)2 aqueous electrolyte and the pseudo-capacitiveeffect originating from the oxygen groups on the surface of CMK-3 were believed to respond for the excellent supercapacitivebehavior of CMK-3 electrode in Ca(NO3)2 aqueous electrolyte.
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Zhu Qinchao,Zhou Xuhao,Zhang Yanan,Ye Di,Yu Kang,Cao Wangbei,Zhang Liwen,Zheng Houwei,Sun Ziyang,Guo Chengchen,Hong Xiaoqian,Zhu Yang,Zhang Yajun,Xiao Ying,Valencak Teresa G.,Ren Tanchen,Ren Daxi 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background : Post-traumatic massive hemorrhage demands immediately available first-aid supplies with reduced operation time and good surgical compliance. In-situ crosslinking gels that are flexibly adapting to the wound shape have a promising potential, but it is still hard to achieve fast gelation, on-demand adhesion, and wide feasibility at the same time. Methods : A white-light crosslinkable natural milk-derived casein hydrogel bioadhesive is presented for the first time. Benefiting from abundant tyrosine residues, casein hydrogel bioadhesive was synthesized by forming di-tyrosine bonds under white light with a ruthenium-based catalyst. We firstly optimized the concentration of proteins and initiators to achieve faster gelation and higher mechanical strength. Then, we examined the degradation, cytotoxicity, tissue adhesion, hemostasis, and wound healing ability of the casein hydrogels to study their potential to be used as bioadhesives. Result : Rapid gelation of casein hydrogel is initiated with an outdoor flashlight, a cellphone flashlight, or an endoscopy lamp, which facilitates its usage during first-aid and minimally invasive operations. The rapid gelation enables 3D printing of the casein hydrogel and excellent hemostasis even during liver hemorrhage due to section injury. The covalent binding between casein and tissue enables robust adhesion which can withstand more than 180 mmHg blood pressure. Moreover, the casein-based hydrogel can facilitate post-traumatic wound healing caused by trauma due to its biocompatibility. Conclusion : Casein-based bioadhesives developed in this study pave a way for broad and practical application in emergency wound management.
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