微波加热法合成CaS∶Ce,Sm及其发光特性

用微波加热法合成CaS∶Ce,Sm材料,由光谱可知,其光激励光谱和发射光谱分别位于红外和可见光区域,因而只要选择适当的光探测方法即可记录发射光。与高温固相法比较,微波加热法合成能够减少S的升华,提高反应速率,同时能够有效回避保护气氛并最大限度地去除对环境的污染;在生成CaS的同时完成稀土金属的掺杂,从而比较容易的得到了纯度较高的CaS∶Ce,Sm。     

CaS：Eu，Sm的制备及发光特性

采用碳还原法制备了电子俘获材料CaS：Eu，Sm，研究了灼烧温度及灼烧时间对样品发光性能的影响,XRD测试表明，样品具有CaS的面心立方结构，晶格常数为0．58nm．样品的激发谱峰值在279、466、497nm处，荧光光谱的峰值在649nm处，光激励发光峰为650nm，光激励发光的光谱响应范围为900-1400nm。     

水热法合成电子俘获材料SrS：Eu~（2＋）、Sm~（3＋）

采用水热法合成了电子俘获材料SrS：Eu2＋、Sm3＋。通过X射线衍射分析、扫描电子显微镜、能谱、光激励发光光谱和荧光衰减,对其微观结构与光谱性能进行了表征。研究表明所制得的SrS：Eu2＋、Sm3＋电子俘获材料为单相的面心立方结构,粒度均一,且粒径小。采用水热合成法能够有效降低样品中杂质含量,并可有效减缓样品衰减速率。光激励发光光谱（λex=980nm）表明Eu2＋和Sm3＋能够掺入SrS基质中,与高温固相法制备的材料相比,水热法制备的SrS：Eu2＋、Sm3＋有更高的发光强度。     

微波辅助法制备TiO2及其光催化性能

以四氯化钛为主要原料,采用微波辅助法制得TiO2光催化材料。运用X射线衍射线、紫外可见光漫反射、拉曼光谱及扫描电子显微镜等多种方法进行表征和分析。结果表明,采用微波辅助法能够获得纳米TiO2,且微波法能够制备出和常规加热法同样的产品,但微波加热快捷省时。焙烧温度对TiO2结构和光催化活性有重要的影响。微波焙烧较适宜的温度为400~600℃。     

Sm3+/Ce3+/Tb3+共掺CaO-B2O3-SiO2发光玻璃的制备及发光性能研究

采用高温熔融法制备了Sm3+/Ce3+/Tb3+共掺杂的CaO-B2O3-SiO2发光玻璃材料,并用荧光分光光度计和CIE色度坐标对其发光性能进行了研究。发射光谱表明,在374nm激发下,Sm3+/Ce3+/Tb3+共掺杂CaO-B2O3-SiO2发光玻璃的发射光谱中同时观测到了红橙光、蓝光和绿光的发射带,这些发射带的混合实现了白光发射。此外,在Sm2O3和Tb4O7含量不变的情况下,随着CeO2含量的减小,Sm3+/Ce3+/Tb3+共掺杂发光玻璃的发光颜色在白光区逐渐由蓝光区附近过渡到黄光区附近。     

铜型抗菌沸石的合成(英文)

用液相、固相离子交换法将沸石与具有抗菌性能的铜离子合成抗菌沸石。用正交法确定了两种方法的较佳条件 ,并进行了比较。液相、固相离子交换法合成铜型抗菌沸石的较佳条件为硫酸铜浓度为 0 .1mol·L- 1 ,硫酸铜用量为 0 .0 2mol;温度分别为 60℃和 5 5 0℃ ,反应时间分别为 4h和 1h。尝试利用微波加热法合成抗菌沸石。微波加热合成抗菌沸石可以减少反应时间和节约能源     

微波合成条件下Sm3+对CaS:Eu2+红色发光的增强

首次在微波场作用 下快速合成了类球形亚超细CaS:Sm^3 ,Eu^2 磷光体,平均粒径为240~450nm,系统考察了Sm^3 ,Eu^2 双掺离子在没掺杂浓度时对CaS磷光体荧光性质的影响,并探讨了Sm^3 →Eu^2 之间的能量传递机理。     

微波法合成金属-有机骨架材料研究应用进展

微波加热是一种简单、高效、低成本的加热方式,近年来在新材料合成方面得到广泛应用。作为新型多孔材料,金属-有机骨架(MOF)材料在吸附、催化等领域的应用备受关注。由于传统加热法合成MOF材料存在反应时间长等缺点,微波法作为一种新的加热方式被越来越多地用于合成MOF材料。与传统加热法相比,微波法合成MOF具有反应速度快、合成的晶体尺寸小等特点。综述了微波法合成MOF材料的研究进展,介绍了该方法合成的MOF材料在气相吸附、液相吸附方面的应用。     

含钐稀土-高分子荧光材料的制备和表征

合成了聚N-异丙基丙烯酰胺-丙烯酸P(NIPAM-co-AAc)共聚微凝胶与Sm(Ⅲ)离子、α--噻吩甲酰三氟丙酮(HTTA)的三元配合物.用激光光散射、Zeta电位、紫外光谱、红外光谱、荧光光谱进行了表征.结果表明,微凝胶粒径为360nm;Sm(Ⅲ)与微凝胶、HTTA之间以配位作用为主;微凝胶、HTTA和Sm(Ⅲ)之间能进行有效的能量传递.配合物的最佳激发波长为348 nm,在此激发波长下Sm(Ⅲ)有荧光特征发射.     

氧化锌/铈纳米材料的微波合成及其光催化性能研究

采用微波辐射-焙烧法合成了ZnO/Ce纳米光催化剂,利用X射线粉末衍射、扫描电镜、X-射线能谱和紫外-可见光谱等技术对ZnO/Ce的晶相结构、表面形貌和光催化性能等进行表征。以罗丹明B脱色降解为模型反应,考察不同合成条件对光催化性能的影响。结果表明:最佳条件为2-甲基咪唑和二水合乙酸锌物质的量比为10∶1,微波辐射12min(650W),无水乙醇为溶剂,马弗炉550℃煅烧5h,铈含量为2%,可以得到纯度高、颗粒小、光降解效果好的ZnO/Ce纳米材料。该材料不仅合成时间短,45min内太阳光下对罗丹明B的降解率为97.1%,较纯ZnO提高了26.6%,降解反应过程符合准一级动力学模型。     

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.