Preparation and Fluorescence Properties of Polymethyl Methacrylate Resin Incorporated with Sodium Tris （Pyridine Dicarboxylato）Europate

Based on the strong fluorescence and the highly thermal stability of sodium tris (pyridine dicarboxylato)eruopate(Na3Eu(DPA)3),polymethyl methacrylate(PMMA)composite material incorporated with the complex,PMMA:Na3Eu(DPA)3,was prepared at 250℃，The fluorescence behavior of PMMA:Na3Eu(DPA)3material was examined,The results show that the composite material keeps the luminescent characteristics of the Eu^3 chelate after PMMA is incorporated with Na3Eu(PDA)3,and strong orange-red emission of the composite wsa observed.The fluorescence intensity of the composite material increases with the increase of the weight ratio of Na3Eu(PDA)3to PMMA,but the relationship is not linear.     

大学生美白化妆品使用现况调查研究

采用网络问卷的形式,对569名大学生进行调查,以了解大学生消费者对美白化妆品的认知、偏好和使用状况。结果显示受访者对美白产品的安全问题和功效问题关注比例最高,有21.9％的人使用美白护肤品后出现接触性皮炎,有81.0％的人认为美白产品的功效不显著。调查数据说明美白化妆品的宣传教育和客观评价标准应引起各方的进一步重视。     

如何挑选氨基酸洁面产品？

<正>从成分和配方角度来说,氨基酸洁面产品是以酰基氨基酸盐作为主表面活性剂的清洁产品。近些年氨基酸概念的洁面产品炒得比较热,原因在于它在清洁力和安全性间达到比较好的平衡。一款洁面产品的评价标准是"净而不干",和脂肪酸盐成分(皂基)的洗面奶相比,氨基酸洁面产品清洁力虽略低一点,但温和性和刺激性远远优于皂基产品,可与专门针对敏感性肤质的温和洗面奶相媲美且清洁力更好。总而言之,氨基酸     

Synthesis and Fluorescence of Novel Conjugated Europium Complex

Organicelectroluminescence (OEL)hasbeenstudiedextensivelyforitslowdrivevoltage ,suitabilityforintegratedcircuitandpotentialapplicationforlargeflatpaneldisplay[1,2 ] .GreenandblueluminescentmaterialsforOELdeviceshavebeenbasicallysatisfiedforOELapplication[3 ] .Toourknowledge ,searchfornovel ,stable ,strongredluminescentmaterialsisur gentforapplicationofOELdevicesatthepresenttime .Becausesomelanthanideions ,e .g .,Eu3 + andTb3 + ,possessgoodluminescencecharacteristics (highcolorpurity)base…