一种二氧化碳基聚脲高分子材料的制备方法

本发明公开了一种二氧化碳基聚脲高分子材料的制备方法,属于高分子材料制备技术领域。解决了现有技术中二氧化碳基聚脲性能不能满足要求的问题,拓宽了二氧化碳基聚脲的应用范围。该制备方法,将端氨基聚脲齐聚物与扩链剂、环氧树脂、醇酸树脂、酚醛树脂、脲醛树脂或者其他活性端基齐聚物进行聚合,得到二氧化碳基聚脲高分子材料；其采用的端氨基聚脲齐聚物的结构式如式Ι所示。该制备方法绿色环保,无污染,工艺简单,原子经济性好,使用范围广,通过不同化学结构的端氨基聚脲齐聚物与不同的底物进一步反应,可以制备性能各异的高分子材料,适用于多种用途

一种抗菌涂层及其制备方法

本发明提供了一种抗菌涂层,由聚吖内酯、多巴胺、抗细菌粘附剂和杀菌剂制备得到。本发明提供的抗菌涂层利用多巴胺中儿茶酚单元的粘附特性,涂层粘附性高,粘附稳定性好,适用于各种表面性质和复杂形状的医疗器械,具有较强的普适性和实用性；抗细菌粘附剂和杀菌剂能够发挥协同作用,使本发明提供的抗菌涂层抗菌效果更优异,对血液和体细胞的不良影响更小,并且生物相容性更优良。本发明还提供了一种抗菌涂层的制备方法。本发明提供的制备方法仅需将基体浸入聚合物溶液中,即可得到抗菌涂层,方法简单易操作,适用性广

电化学沉积制备图案化薄膜材料的方法

本发明公开了一种电化学沉积制备图案化薄膜材料的方法,属于薄膜材料制备技术领域。解决了现有技术中图案化薄膜材料的制备方法成本高、耗时长,只能制备刚性电极,ITO导电基底无法重复利用的技术问题。该方法先采用电化学沉积方法在图案化ITO导电基底上沉积薄膜；然后将沉积有薄膜的ITO导电基底冲洗干净并吹干,用胶布粘贴在沉积有薄膜的ITO导电基底的表面,刮平后,揭下,得到图案化的薄膜材料。该方法制备速度快、精度极高,短至数十秒即可以制备线宽精度为2微米的薄膜材料；且不消耗图案化ITO导电基底,ITO导电基底可以重复利用,完全没有废料产生,成本极低

Poly(Acrylic Acid) Modification of Nd3+-Sensitized Upconversion Nanophosphors for Highly Efficient UCL Imaging and pH-Responsive Drug Delivery

In this work, a simple method is demonstrated for the synthesis of multifunctional core-shell nanoparticles NaYF4:Yb,Er@NaYF4:Yb@NaNdF4:Yb@NaYF4:Yb@PAA (labeled as Er@Y@Nd@Y@PAA or UCNP@PAA), which contain a highly effective 808-nm-to-visible UCNP core and a thin shell of poly(acrylic acid) (PAA) to achieve upconversion bioimaging and pH-sensitive anticancer chemotherapy simultaneously. The core-shell Nd3+-sensitized UCNPs are optimized by varying the shell number, core size, and host lattices. The final optimized Er@Y@Nd@Y nanoparticle composition shows a significantly improved upconversion luminescence intensity, that is, 12.8 times higher than Er@Y@Nd nanoparticles. After coating the nanocomposites with a thin layer of PAA, the resulting UCNP@PAA nanocomposite perform well as a pH-responsive nanocarrier and show clear advantages over UCNP@mSiO(2), which are evidenced by in vitro/in vivo experiments. Histological analysis also reveals that no pathological changes or inflammatory responses occur in the heart, lungs, kidneys, liver, and spleen. In summary, this study presents a major step forward towards a new therapeutic and diagnostic treatment of tumors by using 808-nm excited UCNPs to replace the traditional 980-nm excitation

Individual Surface-Engineered Microorganisms as Robust Pickering Interfacial Biocatalysts for Resistance-Minimized Phase-Transfer Bioconversion

A powerful strategy for long-term and diffusional-resistance-minimized whole-cell biocatalysis in biphasic systems is reported where individually encapsulated bacteria are employed as robust and recyclable Pickering interfacial biocatalysts. By individually immobilizing bacterial cells and optimizing the hydrophobic/hydrophilic balance of the encapsulating magnetic mineral shells, the encased bacteria became interfacially active and locate at the Pickering emulsion interfaces, leading to dramatically enhanced bioconversion performances by minimizing internal and external diffusional resistances. Moreover, insitu product separation and biocatalyst recovery was readily achieved using a remote magnetic field. Importantly, the mineral shell effectively protected the entire cell from long-term organic-solvent stress, as shown by the reusability of the biocatalysts for up to 30cycles, while retaining high stereoselective catalytic activities, cell viabilities, and proliferative abilities

一种高外量子效率和宽光谱响应的有机光电探测器及其制备方法

本发明涉及一种高外量子效率和宽光谱响应的有机光电探测器,包括顺次连接的：下转化层、衬底、阳极、电子注入阻挡层、电子传输层、有源层和阴极；其中电子注入阻挡层的厚度为1纳米到10纳米；电子传输层的厚度在5纳米到60纳米；有源层的厚度在5纳米到200纳米；阴极的厚度为50纳米到1000纳米。本发明利用激子分离后的空穴增强电极处的电子隧穿注入同样实现了较高的光电倍增效应(EQE>15000％),并且该结构还十分有利于实现宽光谱响应的有机光电探测器件

Strongly Coupled Pt-Ni2GeO4 Hybrid Nanostructures as Potential Nanocatalysts for CO Oxidation

A facile and low-cost method has been developed to successfully fabricate 3D flower-like and sphere-like Ni2GeO4 nanostructures with tunable sizes and shapes. It is found that the hard template, polymethyl methacrylate (PMMA) nanopsheres, is essential to the formation of the final products. The as-prepared nanostructures can serve as an outstanding support for Pt nanoparticles after surface modification with l-lysine. In the catalytic test of CO oxidation, Pt-Ni2GeO4 nanoflowers exhibited much higher catalytic performance compared with Pt-Ni2GeO4 nanospheres, representing a typical size-dependent catalytic property

Development of a donor polymer using a B <- N unit for suitable LUMO/HOMO energy levels and improved photovoltaic performance

The LUMO/HOMO energy levels of conjugated polymers are key parameters for their applications as polymer electron donors for polymer solar cells (PSCs). The widely-used strategy to tune the LUMO/HOMO levels of polymer donors is to develop D-A type polymers based on an alternating electron-donating unit (D) and an electron-accepting unit (A). In this paper, we report a novel approach to tune the LUMO/HOMO levels of polymer donors via replacing a C-C unit by a B <- N unit for enhanced PSC device performance. The control polymer PCPDT shows the LUMO/HOMO levels of -2.71 eV/-4.98 eV, which are both much higher than those required for an ideal polymer donor. By replacing a C-C unit with a B <- N unit, the resulting polymer PBNCPDT exhibits much lower LUMO/HOMO levels of -3.23 eV/-5.20 eV. PBNCPDT also shows a narrower optical bandgap (E-g = 1.73 eV) than that (E-g = 1.85 eV) of PCPDT, which is helpful for harvesting of sunlight. Moreover, PBNCPDT with the B <- N unit is not a typical D-A type conjugated polymer because its LUMO and HOMO are both delocalized over the whole conjugated framework. As the control PSC device based on PCPDT exhibits an open-circuit voltage (V-oc) of 0.45 V and power conversion efficiency (PCE) of 0.63%, the device of PBNCPDT shows much improved V-oc of 0.82 V and PCE of 3.74%. These results indicate that a B <- N unit can be used to develop polymer donors for high-performance PSC devices

Photoluminescence Properties of Efficient Blue-Emitting Phosphor alpha-Ca1.65Sr0.35SiO4:Ce3+: Color Tuning via the Substitutions of Si by Al/Ga/B

A series of Ce3+-doped alpha-Ca1.65Sr0.35SiO4 (CSSO) phosphors without and with the substitutions of Si by Al/Ga/B were synthesized via the high-temperature solid-state reaction process. X-ray diffraction patterns and Rietveld refinements were used to demonstrate the successful incorporations of Al/Ga/B into CSSO:Ce3+. Without Al/Ga/B, the Ce3+ singly doped CSSO phosphors present intense blue emission, which correspond to the broad emission bands in visible region with the wavelength range from 360 to 580 nm upon 350 nm excitation. The optimal emission intensity occurs in CSSO:0.05Ce(3+) sample with the emission peak wavelength at 436 nm. With the introduction of Al/Ga/B into the CSSO:0.05Ce(3+), the emission peak shifts from 436 to 457/465/446 nm under 365 nm excitation, respectively. The red shift of Ce3+ emission is attributed to the polyhedral distortion of the cations, resulting in the enhancement of crystal field spitting due to the variations of the adjacent (Al/Ga/B,Si)O-4 polyhedron. Moreover, the temperature-dependent photoluminescence was determined to be of light impact to CSSO:Ce3+ with the introduction of Al/Ga/B. This research is useful for enriching the emission colors of Ce3+-activated phosphors