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热转化法测定颗粒物中硝酸盐的研究 被引量:1
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作者 杨建虎 王良 +5 位作者 李启杰 段佳鹏 靳秀英 田建立 崔延青 张扬 《分析仪器》 CAS 2017年第5期119-122,共4页
建立了测定颗粒物中硝酸盐含量的热转化方法,测试了NH_4NO_3、NaNO_3和KNO_3等硝酸盐的转化效率,在此基础上利用气溶胶发生器产生特定浓度的气溶胶样品,考察了此方法的精密度和线性度等指标,同时与离子色谱分析方法的仪器进行了长期的... 建立了测定颗粒物中硝酸盐含量的热转化方法,测试了NH_4NO_3、NaNO_3和KNO_3等硝酸盐的转化效率,在此基础上利用气溶胶发生器产生特定浓度的气溶胶样品,考察了此方法的精密度和线性度等指标,同时与离子色谱分析方法的仪器进行了长期的比对测试。结果显示在有钼催化的条件下,350℃时硝酸铵的转化效率能达到98.3%,测定标样的相对标准偏差为1.4%,两种方法的相关系数r^2=0.8095。充分证明了热转化法对硝酸盐转化效率高、重复性好,与传统离子色谱分析方法相关性较高。 展开更多
关键词 颗粒物 硝酸盐 热转化法
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低密度碳粘接碳纤维复合材料(CBCF)抗氧化改性研究 被引量:8
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作者 师建军 张宗波 +3 位作者 冯志海 张大海 王筠 徐彩虹 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2018年第7期728-734,共7页
以全氢聚硅氮烷(PHPS)为原料,采用浸渍-热转化方法,在低密度碳粘接碳纤维复合材料(CBCF)中短切碳纤维表面成功包覆硅氧氮(SiON)涂层。采用扫描电子显微镜(SEM)、能量色散X射线光谱(EDS)等分析测试手段对碳纤维表面的SiON涂层进行了形貌... 以全氢聚硅氮烷(PHPS)为原料,采用浸渍-热转化方法,在低密度碳粘接碳纤维复合材料(CBCF)中短切碳纤维表面成功包覆硅氧氮(SiON)涂层。采用扫描电子显微镜(SEM)、能量色散X射线光谱(EDS)等分析测试手段对碳纤维表面的SiON涂层进行了形貌和物相分析,结果表明:涂层主要由Si、O、N元素组成,在PHPS浓度为3wt%和5wt%条件下制备的涂层均匀、致密,随着PHPS浓度的提高,涂层厚度增加,但易发生结块。当PHPS浓度为10wt%和20wt%时,制备的SiON涂层出现结块并且存在裂纹。采用热重分析和等温氧化实验对纯CBCF和SiON涂层改性的CBCF复合材料抗氧化性能进行考核,结果显示碳纤维表面包覆SiON涂层能够显著提高CBCF复合材料的抗氧化性,随着PHPS浓度增大,低密度CBCF复合材料抗氧化性能显著提高。 展开更多
关键词 全氢聚硅氮烷 碳粘接碳纤维复合材料 浸渍-热转化法 SiON涂层 抗氧化
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Field Measurement of NO2 and RNO2 by Two-Channel Thermal Dissociation Cavity Ring Down Spectrometer 被引量:2
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作者 陈剑 吴昊 +2 位作者 刘安雯 胡水明 张劲松 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2017年第5期493-498,I0001,共7页
A two-channel thermal dissociation cavity ring down spectroscopy (CRDS) instrument has been built for in situ, real-time measurement of NO2 and total RNO2 (peroxy nitrates and alkyl nitrates) in ambient air, with ... A two-channel thermal dissociation cavity ring down spectroscopy (CRDS) instrument has been built for in situ, real-time measurement of NO2 and total RNO2 (peroxy nitrates and alkyl nitrates) in ambient air, with a NO2 detection limit of 0.10 ppbv at 1 s. A 6-day long measurement was conducted at urban site of Hefei by using the CRDS instrument with a time resolution of 3 s. A commercial molybdenum converted chemiluminescence (Mo-CL) instrument was also used for comparison. The average RNO2 concentration in the 6 days was measured to be 1.94 ppbv. The Mo-CL instrument overestimated the NO2 concentration by a bias of +1.69 ppbv in average, for the reason that it cannot distinguish RNO2 from NO2. The relative bias could be over 100% during the afternoon hours when NO2 was low but RNO2 was high. 展开更多
关键词 Cavity ring-down spectroscopy Molybdenum converted chemiluminescence Thermal dissociation Organic nitrates
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Quantum dot-sensitized solar cells employing Pt/C_(60) counter electrode provide an efficiency exceeding 2%
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作者 YUE GenTian WU JiHuai +4 位作者 XIAO YaoMing LIN JianMing HUANG MiaoLiang FAN LeQing LAN Zhang 《Science China Chemistry》 SCIE EI CAS 2013年第1期93-100,共8页
A microporous platinum/fullerenes (Pt/C 60) counter electrode was prepared by using a facile rapid thermal decomposition method,and the quantum-dot sensitized solar cell (QDSSC) of Pt/C 60-TiO 2-CdS-ZnS and Pt/C 60-Ti... A microporous platinum/fullerenes (Pt/C 60) counter electrode was prepared by using a facile rapid thermal decomposition method,and the quantum-dot sensitized solar cell (QDSSC) of Pt/C 60-TiO 2-CdS-ZnS and Pt/C 60-TiO 2-CdTe-ZnS was fabrication.The technique forms a good contact between QDs and TiO 2 films.The photovoltaic performances of the as-prepared cells were investigated.The QDSSCs with Pt/C 60 counter electrode show high power conversion efficiency of 1.90% and 2.06%,respectively (under irradiation of a simulated solar light with an intensity of 100 mW cm 2),which is comparable to the one fabricated using conventional Pt electrode. 展开更多
关键词 counter electrode quantum dot microporous platinum/fullerenes solar cell
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