Synthesis and electrochemical performance of Ce 0.05 SnS 2 /graphene nanocomposites as anode materials for lithium-ion batteries

Micro & nano letters

article

Qiufen Wang¹  Ying Huang¹  Juan Miao²  Wenjing Xu³ 

[1] The Key Laboratory of Space Applied Physics and Chemistry for the Ministry of Education, School of Science, Northwestern Polytechnical University;School of Physics and Chemistry, Henan Polytechnic University;Jiaozuo Teachers College

关键词: nanocomposites;    nanoparticles;    cerium compounds;    secondary cells;    electrochemical electrodes;    nanofabrication;    sintering;    X-ray diffraction;    field emission electron microscopy;    transmission electron microscopy;    graphene;    tin compounds;    particle size;    electrochemical performance;    anode materials;    lithium ion batteries;    Ce0.05SnS2-graphene nanocomposites;    hydrothermal method;    sintering;    X-ray diffraction;    field emission transmission electron microscopy;    electrochemical measurements;    flower-like particles;    graphene sheets;    discharge capacity;    retention capacity;    rate capability;    nanographene;    Ce0.05SnS2-C;   

DOI  :  10.1049/mnl.2014.0225

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Background & Aims: Cesarean section performed under subarachnoid block is often accompanied by visceral pain. Hence, various adjuvants have been tried to address this problem and to provide prolonged postoperative analgesia. Highly selective α2-agonist dexmedetomidine is increasingly used as an intrathecal adjuvant. The study was designed to evaluate dexmedetomidine 5 µg as adjuvant to intrathecal hyperbaric 0.5% bupivacaine 9 mg in cesarean sections with respect to block characteristics, sedation and neonatal APGAR scores.Settings and Design: A prospective, randomized, double blinded, controlled studyMethodology: 60 parturients undergoing elective lower segment cesarean section were assigned to 2 groups (n=30) to receive either 0.5% hyperbaric bupivacaine 9 mg with dexmedetomidine 5 µg (Group D) or 0.5% hyperbaric bupivacaine 9 mg with saline (Group C). Block characteristics, hemodynamic parameters, sedation scores and neonatal APGAR scores were recorded. Data obtained were compiled and analyzed with appropriate tests. A p-value of < 0.05 was considered significant.Results: Onset of sensory and motor block were significantly faster in Group D (45 and 43 sec) compared to Group C (68 and 67 sec). Time for two segment sensory regression, duration of sensory and motor block was significantly prolonged in Group D compared to Group C (140 vs 44, 364 vs 126 and 341 vs 113 min). Time for first analgesic request was significantly prolonged in Group D compared to Group C (420 and 69 min). There was no significant difference in hemodynamic parameters, sedation and neonatal APGAR scores between the groups.Conclusions: The addition of 5 µg dexmedetomidine as an intrathecal adjuvant to bupivacaine for cesarean section hastens and prolongs sensory and motor block and provides better perioperative analgesia without significant maternal and neonatal adverse effects.

【 授权许可】

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