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用含氨基的偶联剂修饰介孔分子筛MCM-41的表面,将修饰前和修饰后的介孔分子筛分别负载难溶性药物萘普生(NAP),利用X射线衍射、傅里叶变换红外光谱、差示扫描量热分析、扫描电子显微镜、透射电子显微镜和N2吸附 脱附分析等技术分别对其进行了结构表征和性能测试。 结果表明,药物分子存在于分子筛的孔道中。 负载在MCM-41中的萘普生溶出速率远优于原料药,60 min时大约溶出70%。 氨基修饰后的药物释放速率比修饰前有所减慢,表明可通过氨基修饰调节释放速率。 相似文献
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Zhuo Zhu Xiaomeng Shi Guilan Fan Fujun Li Jun Chen 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(52):19197-19202
A photo‐involved Li‐O2 battery with carbon nitride (C3N4) is presented as a bifunctional photocatalyst to accelerate both oxygen reduction and evolution reactions. With illumination in a discharge process, photoelectrons generated in the conduction band (CB) of C3N4 are donated to O2 for O2?, which undergoes a second electron reduction to O22? and gives the final product of Li2O2; in a reverse process, holes left behind in the valence band (VB) of C3N4 plus an applied lower voltage than the equilibrium drive the Li2O2 oxidation. The discharge voltage is significantly increased to 3.22 V, surpassing the thermodynamic limit of 2.96 V, and the charge voltage is reduced to 3.38 V. This leads to a record‐high round‐trip efficiency of 95.3 % and energy density increase of 23.0 % compared to that in the dark. 相似文献
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Zhang Yaping He Qing Cao Yun Bao Sui Zhou Shun Tian Zhenfeng Wang Xiaofeng Peng Xiaomeng Zhang Xiaoyu Zhu Dongliang She Shike 《Journal of Thermal Analysis and Calorimetry》2019,136(4):1711-1721
Journal of Thermal Analysis and Calorimetry - The interactions of tobacco shred with other tobacco-based materials, like expanded cut tobacco, cut reconstituted tobacco and expanded cut stem during... 相似文献
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TiO2 nanowires were successfully prepared via a simple hydrothermal method and a layer of sulfurized polyaniline(PANI) was loaded onto their surface to prepare a sensor of elemental mercury at room temperature. The sulfurized PANI/TiO2 composite sensor has a high sensitivity to mercury in a range of density from 5.57 mg/m3 to 126.18 mg/m3 at room temperature. The response time and recovery time are relatively short. We also investigated the sensitivity and response time to other interfering gases, such as NO2, SO2 and NH3. And the sulfurized PANI/TiO2 composite material shows a good selectivity for element mercury. The microscopic structure of the sensor was investigated via X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive X-ray analysis (EDAX). The sulfurized PANI/TiO2 composite material shows a high sensitive response, and good selectivity to element mercury, which is promising for the application in the detection of element mercury. 相似文献
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Jiale Gao Nuoya Liu Xiaomeng Zhang En Yang Yuzhu Song Jinyang Zhang Qinqin Han 《Molecules (Basel, Switzerland)》2022,27(2)
Amanita poisoning is one of the most deadly types of mushroom poisoning. α-Amanitin is the main lethal toxin in amanita, and the human-lethal dose is about 0.1 mg/kg. Most of the commonly used detection techniques for α-amanitin require expensive instruments. In this study, the α-amanitin aptamer was selected as the research object, and the stem-loop structure of the original aptamer was not damaged by truncating the redundant bases, in order to improve the affinity and specificity of the aptamer. The specificity and affinity of the truncated aptamers were determined using isothermal titration calorimetry (ITC) and gold nanoparticles (AuNPs), and the affinity and specificity of the aptamers decreased after truncation. Therefore, the original aptamer was selected to establish a simple and specific magnetic bead-based enzyme linked immunoassay (MELISA) method for α-amanitin. The detection limit was 0.369 μg/mL, while, in mushroom it was 0.372 μg/mL and in urine 0.337 μg/mL. Recovery studies were performed by spiking urine and mushroom samples with α-amanitin, and these confirmed the desirable accuracy and practical applicability of our method. The α-amanitin and aptamer recognition sites and binding pockets were investigated in an in vitro molecular docking environment, and the main binding bases of both were T3, G4, C5, T6, T7, C67, and A68. This study truncated the α-amanitin aptamer and proposes a method of detecting α-amanitin. 相似文献
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Xiaomeng Liu Qishun Huang Jun Wang Lanling Zhao Haoran Xu Qing Xia Deyuan Li Lei Qian Huaisheng Wang Jintao Zhang 《中国化学快报》2021,32(6):2086-2090
The sluggish kinetics of oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) have always restricted the development of lithium oxygen batteries(LOBs).Herein,hollow carbon spheres loaded with Pd/Pd_4S heterostructure(Pd/Pd_4S@HCS) were successfully prepared via the in-situ deposition to improve the electrocatalytic activities for both ORR and OER in LOBs.With the welldispersed Pd/Pd_4S nanoparticles,the hierarchical composite with large specific surface area offers favorable transport channels for ions,electron and oxygen.Especially,the Pd/Pd_4S nanoparticles could exhibit excellent electrochemical performance for ORR and OER due to their intrinsic catalytic property and interfacial effect from the heterostructure.Therefore,the LOBs with Pd/Pd_4S@HCS as cathode catalyst show improved specific capacities,good rate ability and stable cycling performance. 相似文献
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Jia Guozhi Maximov A. L. Wang Wei Bai Xuefeng Wei Xiaomeng Su Xiaofang Li Tong Guo Chunmu Wu Wei 《Russian Journal of Applied Chemistry》2020,93(4):502-511
Russian Journal of Applied Chemistry - The preparation of bifunctional catalysts with high catalytic selectivity for the n-alkanes hydroisomerization still remains challenging for the production of... 相似文献