摘要：Lanthanide(Ln^(3+))-doped near infrared(NIR)-II luminescent nanoprobes have shown great promise in many technological fields,but are currently limited by the low absorption efficiency of Ln^(3+)due to the forbidden 4f→4f ***,we report a novel NIR-II luminescent nanoprobe based on efficient energy transfer from Ce^(3+)to Er^(3+)and Nd^(3+)in sub-10 nm SrS nanocrystals(NCs),which are excitable by using a commercial blue light-emitting diode(LED).Through sensitization by the allowed 4f→5d transition of Ce^(3+),the NCs exhibit strong NIR-II luminescence from Er^(3+)and Nd^(3+)with quantum yields of 2.9%and 2.3%,***,by utilizing the intense NIR-II luminescence of Er^(3+)from the thermally coupled Stark sublevels of ^(4)I_(13/2),we demonstrate the application of SrS:Ce^(3+)/Er^(3+)NCs as blue-LED-excitable NIR-II luminescent nanoprobes for ratiometric thermal *** findings reveal the unique advantages of SrS:Ln^(3+)NCs in NIR-II luminescence,which may open up a new avenue for exploring novel and versatile luminescent nanoprobes based on Ln^(3+)-doped sulphide NCs.

摘要：Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution ***,because of the spectral line broadening and multiple sites of lanthanide in upconversion particles(UCPs),the crystal-field(CF)polarization components of UCL are usually ***,we report the linearly polarized UCL in LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals with resolvable CF transition lines and a polarization degree up to *** CF levels and CF transition lines of Er^(3+),as well as their emission polarization anisotropy,are unraveled for the first time through low-temperature and high-resolution photoluminescence(PL)and UCL *** taking advantage of the well-resolved and highly-polarized CF transition lines of Er^(3+),we demonstrate the application of LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals as anisotropic UCL probes for orientation *** findings provide fundamental insights into the polarization anisotropy of UCL in lanthanide-doped single particles,thus laying a foundation for the future design of anisotropic luminescent probes towards versatile applications.

摘要：设计合成了含离子液体的吡啶配体1,2-二甲基-3-乙氧基吡啶六氟磷酸盐咪唑离子液体,在丙酮∶石油醚=3∶1的混合溶剂制备了含咪唑的离子液体.该离子液体可以做配体与Grubbs第二代催化剂反应,制备离子液体负载的钌催化剂,利用(1H,13C,31P)-NMR、元素分析等方法对合成的化合物和催化剂进行表征,催化剂中与钌连接的苯亚甲基上氢(RuCH—Ph)的振动峰由原来第二代催化剂的δ=19.2移至δ=16.27,在δ=-143.3处只出现PF6-中磷的信号峰,PCy3的信号消失,表明PCy3已经被置换完全,得到了新的催化剂.通过ICP测定含吡啶配体的离子液体负载的催化剂在混合物中的含量为14wt%.该催化剂在丙酮、甲醇、咪唑类离子液体等极性溶剂中易于溶解,解决了Grubbs催化剂在离子液体中不溶解的问题,实现了在纯离子液体中均相ROMP反应.考察了催化剂对不同极性单体在离子液体[BMIm]BF4中的开环易位聚合反应,非极性的环辛烯、含有中等极性取代基的5-羟基环辛烯单体以及含强极性取代基的5-腈基-2-降冰片烯单体的转化率分别为96%、73%和51.7%.利用凝胶渗透色谱(GPC)测定了聚合物的分子量及分子量分布.

摘要：为了研究活性自由基共聚物结构,通过一个新的稳态活性自由基共聚模型,用C++语言设计了一个计算机程序,利用此程序可模拟生成ATRcP增长反应链,并获得活性自由基共聚产物的共聚组成、平均段长、链段长度分布,以及元组浓度等反映共聚物微观结构的重要信息。

摘要：为了研究活性自由基共聚物的组成、平均段长、链段分布及各元组浓度等重要结构量,本文运用Monte Carlo模拟方法设计一个计算机程序,模拟具有休眠-活化过程的活性自由基共聚过程,并分析所得到的链结构及微结构相关参数,确定了反应参数和聚合物产物结构的关系。

摘要：探讨有机棉纤维、暖姜纤维以及金黄连纤维混纺纱的生产工艺。针对3种混纺纤维的性能特点,选择合理的配棉方案,确定最佳混纺比。通过正交试验设计优化喷气涡流纺的纺纱参数,分析纱线强力和条干均匀度的变化,得出了最优工艺配置。试验结果表明:当喷嘴气压0.5 MPa、纺纱速度330 m/min、前罗拉钳口到锭子的距离20 mm时,所纺纱线的质量指标相对最佳。认为:有机棉纤维/暖姜纤维/金黄连纤维混纺比为60/20/20时,其针织面料具有一定的抗菌、透气和保温性能。