微纳光纤直径精细控制技术

为实时监测高通量激光系统中洁净情况,提出了基于微纳光纤的微量污染物传感技术。为消除微纳光纤外形结构误差对测试结果影响,首先理论研究了微纳光纤拉制过程,得到了加热长度和拉伸长度误差和引入微纳光纤外形结构偏差的关系,接着通过理论仿真得到了不同拉制参数条件下,微纳光纤外形结构误差情况,并得到了拉制长度为10 mm、直径为1.5 μm的最优制备参数,最后通过实测微纳光纤外形结构验证了理论仿真结果。实验结果表明,通过优化微纳光纤拉制参数可实现其外形结构的精细控制,为微纳光纤用于微量污染物传感工程实用化奠定基础。     

PS-RF双层空心微球的制备

 采用聚苯乙烯(PS)空心微球为模板,间苯二酚-甲醛(RF)为前驱体溶液,邻苯二甲酸二丁酯为分散剂,以界面聚合反应为基础初步总结出一条PS-RF双层聚合物空心微球的制备工艺,并就制备过程中RF溶液与分散剂油相的选择、预聚时间、搅拌速率、固化温度等影响因素进行了讨论。当RF溶液质量分数为25%,间苯二酚与碳酸钠的物质的量之比为100,预聚24 h,搅拌速率120～200 r/min,固化温度35 ℃时,制得了球形度和同心度达到95%以上,表面粗糙度小于10 nm的PS-RF双层空心微球。     

Optical Properties of Oligo(fluorene-vinylene) Functionalized Anthracene Linear Oligomers: Effect of π-extension

The photo-physical properties of oligo(fluorene-vinylene) functionalized anthracene linear oligomers (An-OFV_n (n=1-4)) have been systemically investigated through experimental and theoretical methods. The steady-state spectral measurement shows that the increas-ing of fluorene-vinylene (FV) group could lead to the red shift of absorption spectra and restrain the excimer formation between oligomers. Quantum chemical calculations exhibit that the energy levels of HOMO, LUMO, and the band gap gradually converge to a con-stant in accompany with the increasing of FV unit. Meanwhile, the electronic cloud which distributes on the branch arms, also gradually enhances and makes the absorption spectral shape of oligomers become similar to that of branch arms step by step. The time-resolved fluorescence tests exhibits that the lifetime of excimer emission would be almost invariable after the number of FV group in oligomer is ≥2. In nonlinear optical test, the two-photon photoluminescence efficiency and two-photon absorption cross-section will both gradually enhance and be close to an extremum after the number of FV unit is equal to 4. These results will provide a guideline for the design of novel photo-electronic materials.     

配合物｛[Ni（tyr）2（4,4’-bpt）]·H2O｝·H2O的合成及晶体结构

本文以3,5-二(4-吡啶基)-1,2,4-三唑和酪氨酸为混合配体,利用水热法合成了一个单核镍配合物{[Ni(tyr)2(4,4’-bpt)].H2O}.H2O(1)(其中4,4’-bpt=3,5-二(4-吡啶基)-1,2,4-三唑,Htyr=L-酪氨酸)并利用元素分析、红外光谱和X射线单晶衍射法对其结构进行了表征。结果表明,配合物属于单斜晶系,P21空间群,a=6.0720(12),b=14.083(3),c=17.609(4),β=92.18(3)°,V=1504.6(5)3,Z=2,F(000)=950,S=1.011,最终偏离因子[I>2σ(I)]R1=0.0481,wR2=0.0952,对全部数据R1=0.0583,wR2=0.1000。     

A novel calix[4]arene fluorescent receptor for selective recognition of acetate anion

A novel bridged fluorescent calix[4]arene with 1,8-diaminoanthracene and glycine at the upper rim has been prepared, which exhibited selective recognition towards AcO⁻ over other anions such as F⁻, Cl⁻, Br⁻, , , I⁻ and by fluorescence spectroscopy and ¹H NMR method.     

三个镧系金属氮氧自由基配合物的合成、结构及磁性

以氮氧自由基为配体,合成了3例氮氧自由基-稀土三自旋单核配合物[Ln（hfac）₃（NIT-Ph-4-Br）₂]（Ln=Gd（1）,Tb（2）,Dy（3）,hfac=六氟乙酰丙酮,NIT-Ph-4-Br=4,4,5,5-四甲基-2-（4''-溴）-咪唑啉-3-氧化-1-氧基自由基。单晶结构分析表明3个配合物均属单斜晶系P2₁/c空间群,配合物中的Ln（Ⅲ）离子为八配位模式,并且拥有相似的自由基-稀土-自由基单核结构。对配合物的磁性测试结果表明,配合物1中自由基与Gd（Ⅲ）离子之间存在着铁磁相互作用,自由基与自由基之间存在着反铁磁相互作用;配合物2,3中,稀土离子与自由基之间存在弱的反铁磁相互作用。     

氯乙烯/N-苯基马来酰亚胺悬浮共聚合速率的研究

考察了单体配比、温度、引发剂浓度诸因素对氯乙烯（ＶＣ）／Ｎ－苯基马来酰亚胺（ＰＭＩ）悬浮共聚速率的影响．ＶＣ／ＰＭＩ共聚有显著的交叉终止,致使共聚速率降低,测得交叉终止速率常数的函数＝５．７７,ＰＭＩ均聚综合速率常数的倒数值δ２＝５３．６５,共聚表观活化能Ｅａ＝１２７．９ｋＪ／ｍｏｌ,增长活化能Ｅｐ＝６３．７ｋＪ／ｍｏｌ,聚合速率对引发剂浓度的反应级数为０．７８６．并对ＶＣ／Ｎ－环己基马来酰亚胺（ＣＨＭＩ）和ＶＣ／ＰＭＩ两个体系进行了比较     

Copper(0)-mediated radical polymerization of styrene at room temperature

The “living’/controlled radical polymerization (LRP) of styrene (St) at room temperature is rarely reported. In this work, copper(0) (Cu(0))-mediated radical polymerization of St at room temperature was investigated in detail. Dimethyl sulfoxide (DMSO), N,N-dimethylformamide (DMF) as well as a binary solvent, tetrahydrofuran/1,1,1,3,3,3-hexafluoro-2-propanol were used as the solvents, respectively. Methyl-2-bromopropionate and ethyl 2-bromoisobutyrate were used as the initiators, respectively. The polymerization proceeded smoothly with moderate conversions at room temperature. It was found that DMF was a good solvent with the essential features of LRP, while DMSO was a poor solvent with uncontrollable molecular weights. Besides, the match among the initiator, solvent and molar ratios of reactants can modulate the livingness of the polymerization, and the proper selection of ligand was also crucial to a controlled process. This work provided a first example of Cu(0)-mediated radical polymerization of St at room temperature, which would enrich and strength the LRP technique.     

大尺寸金属氧化物TFT面板设计分析

根据最基本的2T1C像素电路,建立了TFT各参数与AMOLED面板限制因素的计算模型。详细分析了AMOLED显示尺寸与TFT迁移率、金属方块电阻、刷新频率以及器件结构的关系。在大尺寸高分辨率AMOLED面板设计中,信号线RC延迟是主要限制因素。TFT迁移率的提高在一定范围内对大尺寸显示面板设计有利,降低RC延迟是实现大尺寸、高分辨率、高刷新频率显示的关键技术。开发铜布线技术和低寄生电容TFT器件结构是未来大尺寸AMOLED显示的关键技术。