毛细管阵列微反应器制备荧光聚合物纳米粒子

设计并制作了同轴毛细管阵列微反应器,以聚(9,9-二辛基芴-共-苯并噻二唑)(PFBT)为原料、四氢呋喃为溶剂、去离子水为反溶剂、聚苯乙烯-马来酸酐共聚物为稳定剂,采用纳米沉淀法制备了聚合物荧光纳米粒子.用动态光散射技术(DLS)对荧光聚合物纳米粒子的结构进行了表征.结果表明,同轴毛细管阵列微反应器中间层溶剂的存在改变了PFBT溶液与反溶剂的混合方式,克服了微流体注射纳米沉淀法中注射管口的产物沉淀堵塞问题.在PFBT质量浓度高达500 mg/L时,反应器仍可长时间持续运行.同时,聚合物纳米粒子的粒径可通过改变PFBT溶液质量浓度、溶剂和反溶剂的流量比等条件来精确调控.当PFBT溶液质量浓度为50 mg/L、去离子水与PFBT溶液流量比为750时,制备的聚合物纳米粒子尺寸可降至13 nm.该微反应器实现了聚合物纳米粒子的长时间连续可控制备.     

毛细管阵列微反应器制备聚合物荧光纳米粒子

设计并制作了新型同轴毛细管阵列微反应器,结合纳米沉淀法制备了聚合物荧光纳米粒子。实验所用的聚合物为聚（9,9-二辛基芴-共-苯并噻二唑）（PFBT）,溶剂为四氢呋喃（THF）,反溶剂为去离子水,稳定剂为聚苯乙烯-马来酸酐共聚物（PSMA）。产物纳米粒子使用动态光散射技术（DLS）进行表征。结果表明,同轴毛细管阵列微反应器中间层溶剂的存在,改变了聚合物溶液与反溶剂的混合方式,克服了微流体注射纳米沉淀法中注射管口的产物沉淀堵塞问题。在聚合物浓度高达500 mg/L时,反应器仍可长时间持续运行。同时,纳米颗粒的粒径可以通过改变聚合物溶液、溶剂和反溶剂的流量及聚合物溶液浓度等操作条件来精确调控。当 PFBT 溶液的浓度为50 mg/L,去离子水与聚合物溶液的流量比为750：1时,制备的纳米颗粒的尺寸可小至13 nm。该微反应器实现了聚合物纳米粒子的长时间连续可控制备。     

天然纤维素荧光微球的制备及荧光性能研究

采用绿色环保的碱、尿素、水溶剂体系溶解天然纤维素,利用高压静电法得到再生纤维素微球,通过物理包埋和化学键合两种方式成功对纤维素微球进行了荧光功能化。物理包埋法将纤维素溶液与染料共混,在微球高压静电喷雾成型过程负载罗丹明荧光染料,微球呈现强的橘红色荧光,其最大荧光发射波长与单纯罗丹明水溶液相比发生蓝移;化学键合法以环氧氯丙烷为连接剂在天然纤维素表面引入异硫氰酸荧光素酯(FI-TC),荧光显微镜观察显示微球呈现强的绿色荧光,在水溶剂化作用下,化学键合在微球表面的染料与单纯FITC溶液的荧光发射光谱无明显差别。物理负载方式可实现微球的高染料负载量,为10%(wt),但存在荧光染料的泄漏问题;化学负载方式染料共价键结合,无泄漏问题,但染料负载量较低,约为0.2%(wt)。     

带有滤光光阑的微透镜阵列制备方法

文章提出了一种采用湿法刻蚀制备含滤光光阑的三明治结构微透镜阵列(MLA)的方法。该方法制备的微透镜阵列透镜一致性好,其上的滤光层能够有效遮挡杂光,极大改善了激光直写光刻系统(LDI)的曝光效果,并且该方法具有制备设备简单、制备成本低、适合大批量制备的特点。     

湿法刻蚀制备微透镜阵列的影响因素

湿法刻蚀在直接制备微透镜阵列以及制备微透镜阵列复制模具中得到了广泛应用。文章从基材、刻蚀保护层、曝光方式、刻蚀液、刻蚀工艺条件几个方面,介绍其对湿法刻蚀制备凹微透镜阵列品质的影响,并给出了批量制备高良率的微透镜阵列的建议。     

一类蓝色有机发光材料的合成及荧光性能研究

以4,4-(二乙氧基膦酸)联苯苄酯和芳香醛(或肉桂醛)为原料,碱催化下,在DMF溶液中,经过Wittig-Horner反应,合成了7种含苯乙烯基联苯类化合物。利用MS,1H NMR或元素分析表征了化合物的结构,采用紫外光谱和荧光光谱研究了化合物的光谱性能。结果表明,所合成的化合物是一种较为理想的蓝光材料。     

溶胀法制备高强度聚苯乙烯荧光及编码微球

通过对荧光微球制备的传统溶胀法的改进,以二氯甲烷作溶胀剂,0.25%SDS水溶液作分散体系(促进疏水性染料溶胀进入种子微球以增加微球荧光强度),制备出了荧光强度高,单分散性好(平均粒径3.6μm,变异系数3.7%),光学性质稳定,定量染色的绿色、橙色、红色三种荧光微球。将发生荧光共振能量转移的两种染料同时溶胀进种子微球中,制备了能产生双荧光信号的荧光编码微球。     

磁性荧光聚合物载药微球的制备

采用反相微乳液法合成氨基功能化的CdTe-Fe_3O_4/SiO_2磁性荧光复合纳米粒子,通过去甲斑蝥酸钠(SNCID)的羧基与氨基化的CdTe-Fe_3O_4/SiO_2磁性荧光复合纳米粒子孔道表面的羟基形成氢键,制成磁性荧光聚合物载药微球。采用荧光分光光度计(FS)、扫描电镜(SEM)、紫外-可见分光光度计(UV-Vis)、傅里叶红外光谱仪(FT-IR)等方法对该聚合物载药微球的理化性质进行表征分析。结果显示磁性荧光聚合物载药微球为球状,具有良好的分散性和光致发光能力等优点,其载药量和包封率分别为21.49%和69.84%。磁性荧光复合纳米粒子可作为具有荧光性质的药物载体。     

聚合物荧光微球的研究进展

综述了近年来聚合物荧光微球的研究状况和技术进展,重点讨论了聚合物荧光微球的制备方法(吸附法、包埋法、自组装法、接枝法、共聚法)和其在生物医学领域的主要应用(高通量药物筛选、免疫分析、固定化酶与基因研究、标准物与生物探针),并对荧光微球的分类方法进行了简单介绍。同时对聚合物荧光微球的发展趋势及应用前景进行了分析和展望。     

高度有序TiO2纳米管阵列的制备及其光催化性能研究

室温下在NH4F、乙二醇的混合溶液中采用阳极氧化法在纯Ti片表面得到一层结构高度有序、分布均匀、垂直取向TiO2纳米管阵列,通过调整阳极氧化工艺条件可实现对其结构参数(如管径、管壁厚度、管长等)的有效控制;对TiO2纳米管阵列进行扫描电子显微镜(SEM)、X-射线衍射(XRD)检测;测试了TiO2纳米管降解甲基橙的光催化性能。结果表明:在优化条件下制备得到了高密度排列的TiO2纳米管阵列;在500 W高压汞灯照射40 min后,初始摩尔浓度为20 mg·L-1的甲基橙在pH=2.0时,降解率达到99.4%,溶液中加入H2O2可以提高TiO2纳米管光降解催化活性。     

Microscale analysis of patterning reactions via FTIR imaging: Application to intelligent hydrogel systems

A novel application of FTIR imaging for real-time characterization of patterning polymerization processes with microscale spatial resolution is presented. These methods will enable the microscale analysis of the reactions of polymeric systems with various substrates and devices. Specifically, intelligent hydrogels containing ionic groups (pH responsive) and poly(ethylene glycol) have been micropatterned onto gold surfaces, and the free-radical polymerization reaction has been characterized. It was demonstrated that differences in the reaction rates across a patterned region could be successfully resolved and characterized. This novel characterization method based on FTIR imaging will facilitate the optimization of integration processes of patterned polymeric films leading to enhanced (and reproducible) application of these materials as functional components in a variety of microdevices.     

Fabrication of Highly Ordered Polymeric Nanodot and Nanowire Arrays Templated by Supramolecular Assembly Block Copolymer Nanoporous Thin Films

Realizing the vast technological potential of patternable block copolymers requires both the precise controlling of the orientation and long-range ordering, which is still a challenging topic so far. Recently, we have demonstrated that ordered nanoporous thin film can be fabricated from a simple supramolecular assembly approach. Here we will extend this approach and provide a general route to fabricate large areas of highly ordered polymeric nanodot and nanowire arrays. We revealed that under a mixture solvent annealing atmosphere, a near-defect-free nanoporous thin film over large areas can be achieved. Under the direction of interpolymer hydrogen bonding and capillary action of nanopores, this ordered porous nanotemplate can be properly filled with phenolic resin precursor, followed by curation and pyrolysis at middle temperature to remove the nanotemplate, a perfect ordered polymer nanodot arrays replication was obtained. The orientation of the supramolecular assembly thin films can be readily re-aligned parallel to the substrate upon exposure to chloroform vapor, so this facile nanotemplate replica method can be further extend to generate large areas of polymeric nanowire arrays. Thus, we achieved a successful sub-30 nm patterns nanotemplates transfer methodology for fabricating polymeric nanopattern arrays with highly ordered structure and tunable morphologies.     

聚己内酯材料的改性及在3D打印中的应用

主要综述了通过物理和化学方法制备改性聚己内酯(PCL)的方法和所制备的改性PCL的性能,并且对PCL材料在3D打印领域中的应用也进行了介绍。由于PCL具有较好的生物相容性和韧性,并且改性的PCL也具有较为理想的强度,相应的3D打印产品可用到组织工程领域。另外,化学改性的PCL还具有一定的功能性。     

3D Printing/Interfacial Polymerization Coupling for the Fabrication of Conductive Hydrogel

In this study, 3D printing is coupled with interfacial polymerization to obtain electroactive hydrogels with complex and defined geometry. Conductive hydrogels are created through a two‐step procedure: first a digital light processing 3D printing system is used to fabricate poly(ethylene glycol)diacrylate 3D structure and then pyrrole is oxidized to polypyrrole (PPY), exploiting an interfacial polymerization mechanism through which PPY can be formed in the poly(ethylene glycol) matrix, thus creating a conductive phase.     

Patterned growth of CdS by combined electrochemical atomic layer epitaxy and microcontact printing techniques

Ultrathin films of well-ordered CdS on Ag(1 1 1) can be attained by electrochemical atomic layer epitaxy (ECALE) technique, which is based on self-limiting reactions, such as underpotential deposition. The layer-by-layer electrodeposition on single crystal faces allows a precise control of film thickness and yields semiconducting nanostructures of high crystallinity. In this paper, the ECALE method has been used to deposit CdS on Ag(1 1 1) covered by patterns of hexadecanethiol, C₁₆SH. The patterned Ag(1 1 1) was obtained by using the microcontact printing technique of a polydimethylsiloxane (PDMS) stamp previously immersed in C₁₆SH. The stamp used in this work produced thiol strips 320 nm large, with an 850 nm pitch.The deposition of CdS takes only place on the uncovered silver substrate whereas it is prevented on the thiols monolayers, yielding CdS patterned according to the used stamp. The deposit has been characterized by electrochemical techniques and AFM measurements.     

热脱附-气/质联用法快速测定烟用印刷油墨中的挥发性成分

应用热脱附-气/质联用法(TDS-GC/MS)对卷烟包装材料印刷中使用的油墨挥发性成分进行了分析测定,对影响热脱附的条件进行了优化。结果表明,热脱附温度80℃,脱附时间2 min,冷阱温度-150℃为最佳组合水平。同时对方法的重现性进行了考察,各目标物的相对标准偏差小于15%(n=6)。     

纺织品数码静电印花技术的开发与有机颜料显色剂

20世纪80年代开发的数码喷墨印花开创了无版印花的先例,但是受到生产速率低和印墨成本高的制约,至今只占印花织物的1～3%.90年代中期,美国和日本在彩色静电复印的基础上,研究开发了数码静电印花技术,生产速率达到网印水平.本文介绍美国乔治亚学院的研究成果,重点是有机颜料着色剂和TIPS技术制造的专用粘合剂,以及二者混合而成的显色剂.     

安全无害粉末粘接型三维打印成形材料研究

为了研究安全无害粉末粘接三维打印成形材料,本文分析比较了目前常用的成形材料的安全性和成形效果,从常用的医用辅料和食品添加剂中选出了满足三维打印成形工艺要求的材料:聚乙烯吡咯烷酮(PVP)、羟丙基甲基纤维素(HPMC)、乙基纤维素(EC)、微粉硅胶。通过试验验证了各材料的成形性能和在成形过程中所起的作用,并打印出了较理想的三维打印制品。     

Fabrication of Photothermally Responsive Nanocomposite Hydrogel through 3D Printing

The responsive hydrogels have received great attention in many fields. However, the molding method and response mode of such hydrogels are criticized when it comes to real applications. In this work, a novel class of poly(N‐isopropyl acrylamide)/graphene oxide (PNIPAm/GO) nanocomposite hydrogel through self‐assembly three‐dimensional (3D) printing via ultraviolet light polymerization. The precursor is ordinarily constituted by NIPAm monomer, crosslinker, and water mixed with a photoinitiator, besides the introduction of nanoclay adjusts the shear thinning properties to an optimal level, which is important for the 3D printing precision. Then, the graphite oxide as infrared light absorber endows the hydrogel fast photothermal excited responsivity instead of conventional temperature response. The shrinkage and swelling of the composite hydrogel can be controlled by turning the near‐infrared light on or off. Meanwhile, the reversible behavior of as‐prepared hydrogel is easily regulated by altering the content of GO and illumination time of near‐infrared light. Additionally, a round tube is obtained based on the as‐prepared hydrogel, which can be driven to get a pencil, indicating their potential applications in actuator and other functional program.