一步法制备有序介孔炭/硫化镉纳米复合材料

采用一步法制备出有序介孔炭原位负载纳米硫化镉(Cd S)粒子复合材料。该法以酚醛树脂、硫脲、硝酸镉为前驱体,三嵌段共聚物F127为模板剂,最终炭化得到有序介孔炭/Cd S纳米复合材料,并采用XRD、BET和TEM等技术对产物进行表征。该复合材料具有有序的孔道结构,均一的孔直径(3.4~4.1 nm)和大的比表面积(554.2 m2/g)。纳米Cd S粒子为较稳定的六方晶相,粒径均一,且高度分散在有序介孔炭内,随着Cd S粒子含量的增加,介孔炭有序度降低。     

活化和氮掺杂炭层包覆碳纳米管载铂催化剂电催化性能研究

利用化学浸渍还原法,以原始和混酸活化碳纳米管,及聚苯胺改性制备的氮掺杂炭层包覆碳纳米管为载体,制备上述碳纳米管负载铂催化剂,研究比较它们作为质子交换膜燃料电池催化剂的电催化性能。透射电镜观察表明,以混酸活化碳纳米管为载体一定程度改善了铂粒子在碳管上的沉积形态和分散性,沉积的铂粒子大小约5~8nm,但铂粒子仍存在较明显的团聚现象;而因聚苯胺改性碳纳米管外层为均匀氮掺杂炭层,铂粒子能均匀分散沉积于氮掺杂层表面,其平均粒径约为2~4nm。电化学分析表明,混酸活化和氮掺杂炭层包覆碳纳米管都能够改善负载催化剂的电催化活性,尤其氮掺杂炭层包覆碳纳米管负载铂催化剂不仅具有最高氧还原活性,其负载催化剂同时展现了良好的循环稳定性。     

金属纳米粒子/微管簇碳纤维复合材料的合成与研究

借助原位还原法,成功地将铂纳米粒子负载在一种具有微管簇形貌的植物载体-剑麻纤维中,负载的铂纳米粒子的平均粒径约为3.6nm.通过在400℃下碳化这种含有铂纳米粒子的剑麻纤维,得到铂纳米粒子/碳纤维复合材料,这种碳纤维保留了原来剑麻纤维的微管簇形貌.剑麻纤维中相邻的微管壁和它们所夹的胞间层在碳化反应之后,融为一体,变成了均一的碳微管壁.虽然碳化后铂纳米粒子的平均粒径增大到5.3m左右,但是生成的载体碳纤维还是有效地阻止了铂纳米粒子的生长.这种铂纳米粒子/碳纤维复合材料兼具微管簇结构、碳纤维载体和活性铂纳米粒子的优点,很可能成为一种新型的异相催化剂,在很多领域中具有开发前景.     

负载Pd纳米粒子聚合物颗粒的制备及其催化性能研究

使聚N-乙烯基乙酰胺（PNVA）大分子单体与苯乙烯（St）和丙烯腈（AN）进行三元分散共聚,制得了粒径分布较均一、表面带有花纹状的PNVA-g-PAN/PSt聚合物颗粒,进而以PdCl2为金属源,乙醇为还原剂,采用醇热法将Pd2＋离子还原成Pd纳米粒子并负载于聚合物颗粒表面。透射电子显微镜（TEM）观察表明Pd纳米粒子在聚合物颗粒表面且分布均匀。X射线衍射（XRD）花样图显示Pd纳米粒子为立方晶系,其粒径在9nm左右。热重分析（TGA）结果表明PNVA-g-PAN/PSt聚合物颗粒表面所含Pd纳米粒子的质量分数为0.15%～0.30%。在Pd纳米粒子存在的条件下,可使葡萄糖容易转化为葡萄糖酸,表明该负载型Pd纳米粒子具有良好的催化氧化作用。     

碳负载尺寸可控的铂纳米粒子微波合成和表征

分别以XC-72碳和碳纳米管为载体,H₂PtCl₆为前驱体,用微波辐射加热的方法合成了碳负载的铂纳米粒子,并对其进行了EDX、TEM和XRD表征.研究了H₂PtCl₆乙二醇溶液的pH值对微波合成铂纳米粒子的大小、均匀性及其在碳载体上分散程度的影响.研究结果发现对于Pt/XC-72碳,随着pH值从3.4增加到9.5,铂纳米粒子的平均粒径从5.5nm减小到2.7nm;对于Pt/CNTs,随着pH值从3.5增加到9.4,铂纳米粒子的平均粒径从5.3nm减小到2.8nm.另外,随着pH值的增加,铂纳米粒子的尺寸均匀性及其在碳载体表面的分散程度得到改善.     

溶胶-凝胶法制备电极催化剂用纳米WC及其脱玻璃碳研究

以钨酸钠为钨源，酚醛树脂为碳源，采用溶胶-凝胶法制备WC前驱体，在氩气、氢气混合气氛下高温原位还原碳化制备纳米WC。分别采用浓硝酸和氢气对WC中的残余玻璃碳进行脱碳处理。在含有WC的氯铂酸（H2PtCl6·6H2O）悬浊液中采用甲醛（HCH0）还原法制备纳米WC负载纳米Pt的复合粒子，将其制作成工作电极，在酸性介质中采...     

微孔炭的纳米孔结构和表面微结构

综述了微孔炭微观结构研究的最新进展，介绍了以活性炭纤维（ＡＣＦ）为代表的微孔炭的纳米孔空间有别于宏观炭材料表面的性质，主要内容有：微孔炭中，超微粒子构筑而成的纳米孔空间是一个强大分子场形成的高压空间；微孔中形成的吸附态分子与体相分子性质大不相同；通过调整孔尺度和微表面结构可以调节纳米孔空间性质。     

Pt／C催化剂的制备及其对甲醇电催化氧化的研究

首次报道了以乙二胺四乙酸（EDTA）作为螯合剂,采用硼氢化钠还原氯铂酸制备Pt／C（Pt的质量分数为20％）纳米催化剂,TEM分析表明,通过改变反应的pH值可以获得分散度与粒径不同的Pt粒子,当pH=12．5时,Pt的分散度最高,平均粒径最小（3．2nm）。催化剂的退火处理研究表明,经270℃氮气氛围内退火后,其电催化活性有了显著提高。使用循环伏安法在甲醇的溶液中电催化氧化研究结果表明,在pH=12．5时制备的催化剂对甲醇的电催化氧化活性最高。     

纳米氧化镁模板法制备氮掺杂炭电极材料

六水氯化镁作为镁源,制备了粒径范围11~26nm的氧化镁,以纳米氧化镁为模板,将聚丙烯酰胺高温炭化,酸溶去模板,制备出高含氮量的多孔炭材料,并对材料进行XRD、SEM、孔径表征和电化学性能测试。结果显示,炭材料以层状为主,平均孔径为4.72nm,比表面积达1873m2/g;在1mol/LH2SO4电解液中,放电电流密度为1A/g时,电极材料的质量比电容达176F/g。     

纳米氧化镁模板法制备氮掺杂炭电极材料

六水氯化镁作为镁源,制备了粒径范围11~26nm的氧化镁,以纳米氧化镁为模板,将聚丙烯酰胺高温炭化,酸溶去模板,制备出高含氮量的多孔炭材料,并对材料进行XRD、SEM、孔径表征和电化学性能测试。结果显示,炭材料以层状为主,平均孔径为4.72nm,比表面积达1873m2/g;在1mol/L H2SO4电解液中,放电电流密度为1A/g时,电极材料的质量比电容达176F/g。     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.