紫外光辐照下钛硅共掺杂类金刚石薄膜微结构的演化

采用中频磁控溅射Ti80Si20合金靶在单晶硅表面制备了钛硅共掺杂的类金刚石薄膜。利用紫外-可见光多波长Raman光谱表征薄膜微结构, 并结合FTIR光谱研究了紫外光辐照对类金刚石薄膜微结构的影响, 进一步讨论了紫外光辐照下薄膜微结构的演化机理。结果表明: 非晶结构的类金刚石薄膜出现反式聚乙炔和聚对苯乙炔类聚合物结构以及sp杂化的线型卡宾碳结构。紫外光辐照诱导薄膜微结构驰豫和重构, 薄膜Si-O和C-O键含量增加, C=C和C-H键含量减少; 同时薄膜sp²团簇尺寸减小而无序度增大。     

聚乳酸/TiO_2杂化薄膜的抗紫外光性能

采用超声分散并浇注成膜法制备了聚乳酸/金红石型二氧化钛(PLLA/Rutile TiO2)、聚乳酸/锐钛型二氧化钛(PLLA/Anatase TiO2)两种杂化薄膜。通过扫描电镜(SEM)观察、红外吸收光谱(FT-IR)测定、差示扫描量热(DSC)分析、热失重(TGA)分析等方法,研究了聚乳酸经紫外光辐照后的结构性能变化及不同晶型TiO2在改善聚乳酸抗紫外光性能方面的作用。结果表明,经空气氛中紫外光的作用,聚乳酸分子链中与羰基相连的碳-氧键(C-O键)断裂,生成羧基(-COOH)和羟基(-OH);Rutile TiO2和Anatase TiO2的加入均可抑制紫外光对聚乳酸分子的破坏作用,Rutile TiO2的抑制作用比Anatase TiO2强。     

石墨烯对ABS/PC共混物耐紫外光辐照性能的影响

采用红外光谱、差示扫描量热法和扫描电子显微镜并结合拉伸性能分析,研究了石墨烯对聚(丙烯腈-丁二烯-苯乙烯)/聚碳酸酯(ABS/PC)共混物耐紫外光辐照性能的影响。结果表明,紫外光辐照过程中,虽然PC组分未发生明显的结构变化,但ABS组分的分子结构受到破坏,产生羰基、羟基等含氧基团化合物,导致力学性能劣化。辐照100 h,共混物的拉伸强度由58.68 MPa降低至49.72 MPa,拉伸断裂伸长率由11.65%降低至3.3%;引入石墨烯后,共混物在紫外光辐照下的老化过程受到抑制,且这种抑制作用随着石墨烯含量的增加而增强。引入1%的石墨烯,即可使共混物发生由韧至脆的转变所经历的辐照时间由100 h延长到200 h。通过引入石墨烯,能提高ABS/PC共混物耐紫外光辐照性能。     

感光溶胶—凝胶法制备光波导薄膜微图案

利用溶胶-凝胶法制备了有机-无机杂化光敏性SiO2-TiO2材料,在单晶硅基片上旋转涂膜,经前烘、紫外光固化、淋洗、后烘等步骤,在硅片上得到复制有掩模微图案的薄膜。用紫外-可见光-近红外分光光度计测试了薄膜的光透过吸收性质,用Fourier红外光谱仪测试了不同紫外光辐照时间下薄膜的红外振动吸收光谱,用高倍光学显微镜和扫描电子显微镜(SEM)观察制备得到的薄膜微图案。结果表明:薄膜在紫外可见光区域的光透过率约为90%,紫外光照能促使不同的官能团间发生缩聚反应,80℃前烘温度处理以及15min左右的紫外光辐照能够得到清晰、精确的薄膜微图案。     

复合紫外吸收剂对聚丙烯酸酯乳液薄膜抗老化性的影响(英文)

讨论了金红石型纳米TiO2,2-羟基-4-正辛氧基二苯甲酮(UV-531)及R-TiO2/UV-531的紫外光吸收性质,并通过超声分散和原位聚合工艺将其添加到聚丙烯酸酯乳液中,采用UV-vis,FTIR和SEM探讨了紫外吸收剂对聚丙烯酸酯乳液薄膜抗紫外老化性能的影响。结果表明,复合紫外吸收剂拓展了紫外光区的吸收范围,优于单一的有机/无机紫外吸收剂。R-TiO2/UV-531发挥了有机和无机紫外吸收剂的协同效应,利用具有良好光稳定性的金红石型纳米TiO2的遮光性减缓了UV-531的分解。原位聚合使R-TiO2/UV-531更好地分散于乳液中,提高了薄膜的抗老化性。     

介孔二氧化硅搭载UV-9透明抗紫外聚丙烯食品包装薄膜制备及其性能评价

以十六烷基三甲基溴化铵(CTAB)作为模板剂制备出纳米介孔SiO2,并以此为载体搭载抗紫外助剂UV-9制备“SiO2/UV-9”粉体,将聚丙烯(PP)与“SiO2/UV-9”和UV-329共混后,流延挤出制备透明抗紫外包装复配膜。采用投射电镜、氮气吸附等手段表征介孔SiO2结构,对薄膜进行紫外-可见光光谱分析、膜内助剂迁移试验测试。结果表明,制备介孔SiO2的比表面积为725 m^2/g,平均孔径为2.8 nm;该包装复配薄膜内抗紫外助剂低于水基、酸性和酒精类食品接触材料特定迁移限量(SML);复配薄膜在可见光波段的透光率达80%以上,在紫外光波段的透光率低于40%。     

二氧化钛薄膜亲水性恢复研究

新制备的锐钛矿TiO2薄膜具有超亲水性,在使用和储存过程中超亲水性会降低.本文探究恢复亲水性的方法,采用热处理、等离子体辐照、紫外光照射等技术恢复锐钛矿TiO2薄膜亲水性,三种方法均能够有效地恢复薄膜表面的亲水性.热处理及紫外光照射操作简单而经过等离子体辐照的薄膜能保持更长时间的可见光致亲水性.     

类金刚石薄膜的紫外辐照研究

对射频等离子体方法制备的类金刚石（以下简称DLC）薄膜样品进行了紫外辐照，采用电阻率，Raman光谱及红外光谱研究了紫外光（以下简称UV）辐照对DLC薄膜结构与特征的影响，Raman光谱表明：紫外光对DLC薄膜中SP^3C-H键的破坏作用非常明显，红外（IR）光谱结果进一步验证了这一结果，经UV辐照后，DLC薄膜的电阻率呈变小趋势，这说明薄膜被强烈氧化，最后呈现石墨化趋势。     

改性纳米二氧化钛光催化降解聚乙烯薄膜的研究

以硬脂酸钠改性的纳米TiO2为光催化剂,与LDPE树脂制备了nano-TiO2/PE复合薄膜.研究了该薄膜在紫外光照射条件下的降解性能,并进行了SEM、FI-IR、VHX-100数码显微镜等分析,测试了薄膜经辐照前后的力学性能、质量变化和分子量变化.研究结果表明,该薄膜在紫外光照射下降解性能明显提高,薄膜在40W、254nm的紫外光照射120h后,粘均分子量(Mη)降低27.1%,拉伸强度降低49.1%,断裂伸长率降低91.3%;照射144h后质量损失达16%(质量分数);辐照后薄膜的羰基含量升高.     

碳点基紫外线吸收剂的合成及在聚乙烯/木粉复合材料中的应用

首先以壳聚糖、柠檬酸、辛醛为原料,通过水热法合成了壳聚糖衍生物基聚合物碳点,然后与2,4-二羟基二苯甲酮(UV-0)、多聚甲醛通过曼尼希反应合成了一类新型壳聚糖衍生物碳点基紫外线吸收剂(P(CS-g-OC-CA)Ds-g-UV-0)。通过红外光谱、紫外吸收光谱、X射线衍射、热重分析对中间体和产物进行了结构表征与性能测试。结果表明,P(CS-g-OC-CA)Ds-g-UV-0具有良好的紫外光吸收性和耐热稳定性。将P(CS-g-OC-CA)Ds-g-UV-0应用到聚乙烯(PE)/木粉复合材料中,经过40 d的紫外加速老化实验系统研究了木塑复合材料的抗紫外老化性能,并与低分子紫外线吸收剂UV-0的应用性能进行了对比研究。对老化前后复合材料的冲击强度、羧基指数、纤维素指数以及扫描电子显微镜等性能进行了测试。结果表明,添加3%以上P(CS-g-OC-CA)Ds-g-UV-0不仅可以对PE/木粉复合材料起到良好的抗紫外光老化效果,同时还可以提高复合材料的冲击强度。     

反应型紫外线吸收剂的制备及高分子化

通过小分子紫外线吸收剂2,4-二羟基二苯甲酮(UV-0)与甲基丙烯酰氯反应制备了反应型紫外线吸收剂4-甲基丙烯酸酯基-2-羟基二苯甲酮(MHB),其结构由1H-NM R,FT-IR,UV-V is吸收光谱等手段进行表征。采用溶液聚合方法,通过与苯乙烯共聚,制得po ly(S t-co-MHB)共聚物,实现了MHB的高分子化。凝胶渗透色谱(GPC)测定结果表明,po ly(S t-co-MHB)的数均分子量在21000左右,分子量分布指数为2.5,共聚是实现MHB高分子化的有效途径。UV-V is吸收光谱测试结果表明,随MHB含量增加,po ly(S t-co-MHB)共聚物的紫外吸收性能增强。     

ZnO/Al2O3 coatings for the photoprotection of polycarbonate

ZnO and ZnO/Al₂O₃ thin films were deposited by r.f. magnetron sputtering on polycarbonate (PC) films in order to protect this polymer against photodegradation. The composition, structure and optical properties of the ceramic coatings were characterised. CO₂-plasma treatments were applied to PC in order to improve the coating adhesion. The PC surface energy was characterised by wettability measurements and the chemical bonds were analysed by XPS.It was found that ZnO coatings improve the stability of PC to UV radiations and that an intermediate alumina coating inhibits the photocatalytic oxidation of PC at the PC/ZnO interface. Additionally an external alumina coating brings a high hardness to the coating.     

聚碳酸酯-聚二甲基硅氧烷共聚物的制备及其对聚碳酸酯的改性

为了实现聚碳酸酯的回收和循环利用,利用化学降解法实现聚碳酸酯(PC)的可控降解,得到端羟基聚碳酸酯。利用氯封端的聚二甲基硅氧烷与端羟基聚碳酸酯反应得到聚碳酸酯-聚二甲基硅氧烷(PC-PDMS)共聚物,采用红外、核磁、热重分析对共聚物进行了表征。测试结果表明,共聚物中PDMS的质量分数为37.73%,共聚物的热稳定性介于PC和降解产物之间。采用双螺杆挤出机制备PC/PC-PDMS共混物,用毛细管流变仪测试其流动性能。共混物注塑成标准样条用于力学性能测试,结果表明PC的缺口冲击强度得到提高。     

Study of the deposition parameters and Fe-dopant effect in the photocatalytic activity of TiO2 films prepared by dc reactive magnetron sputtering

The reactive magnetron sputtering method was used to prepare pure and Fe-doped titanium dioxide thin films. The films were deposited onto microscope glass slides and polycarbonate plates at different total pressure and Fe-doping concentrations. The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and UV-visible spectroscopy (UV). For glass substrates a polycrystalline TiO₂ structure was verified with X-ray diffraction, which showed typical characteristic anatase reflections. An iron phase appeared in the highly Fe-doped samples. The absorption edges of the Fe-doped TiO₂ films shifted to visible region with increasing concentration of iron. For the polycarbonate substrate an amorphous TiO₂ structure was revealed for all deposition conditions. The effects of different Fe-doping and total pressure levels on the photocatalytic activity were obtained by the degradation rates of Rhodamine-B (RoB) dye under UV light irradiation. For the deposition conditions considered in this study the highest photodegradation rates were achieved for films deposited on the polymer substrates. Of these overall highest rates was achieved for deposition at 0.4 Pa and without doping. However, for both substrates, films prepared at the particular total pressure of 0.5 Pa and a low iron concentration showed better photocatalytic activity than the pure TiO₂ films prepared under the same deposition parameters. On the contrary, the photocatalytic degradation rates of RoB on the highly Fe-doped TiO₂ films decreased strongly.     

Influence of substrates on the structural and optical properties of chemically deposited CdS films

Cadmium sulfide (CdS) films were chemically deposited on glass, polycarbonate (PC), polyethylene terephthalate (PET), and Si wafer. Effects of substrate types on the structural and optical properties of the films were investigated. There is a preferential orientation of the crystallites in the film grown on the glass along the c-axis (perpendicular to the plane of the substrate) producing a strong hexagonal (0 0 2) or cubic (1 1 1) peak, regardless of the presence of ITO coating. However, such preferential orientation decreases or disappears when the deposition was made onto PC or PET substrates. The crystallinity of CdS films on glass and Si is better than that of the other ones. The average transmittance of the films on PC and PET is about 50% and 55%, respectively, and increases up to 70% for glass substrate. The improvement of the transmittance was obtained from ITO-coated substrates.     

Photocatalytic properties of Au/TiO2 thin films prepared by RF magnetron co-sputtering

Au/TiO₂ thin films with various Au doping contents were deposited on quartz substrates by radio frequency (RF) magnetron co-sputtering. The as-deposited Au/TiO₂ films were characterized by energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), XRD, and UV-vis techniques. Au doping and UV treatment enhanced the photocatalytic efficiency of TiO₂ thin films. The optimal RF power of the Au target and UV treatment time were 5 W and 1 h, respectively. The enhanced photoactivity of Au(5 W)/TiO₂ thin films with UV treatment is found to result from the increased hydroxyl concentration.     

Microfabricated polycarbonate CE devices for DNA analysis

The microchip capillary electrophoresis (CE) devices were fabricated in polycarbonate (PC) plastic material by compression molding. The molded devices were enclosed utilizing thermal bonding to another PC wafer. These thermal bonds do not yield up to an applied force equivalent to 150 psi. Aqueous fluid transport inside the plastic CE devices was enhanced by UV irradiation treatment of the hydrophobic polycarbonate plastic surfaces prior to thermal bonding. In comparison to glass microchannels, electroosmotic flow (EOF) in native PC channels is low and is independent of buffer pH at pH 7 and 9. UV irradiation of PC surfaces increases surface hydrophilicity and increases EOF. CE DNA separation was demonstrated in these PC CE devices with good resolution and run-to-run reproducibility. The on-chip PCR/CE analysis of a 500-bp region of bacteriophage lambda DNA was also demonstrated.     

聚乙烯醇复合薄膜的抗紫外线性能

目的研究聚乙烯醇(PVA)复合薄膜(添加紫外线阻隔剂)的紫外线透过率和透明性能。方法将不同种类、不同质量分数的紫外线阻隔剂与PVA原料混合制备复合薄膜,检测其紫外线透过率、透光率、雾度。结果添加有机紫外线吸收剂UV-284后,薄膜能够有效阻隔大部分紫外线,但影响薄膜的外观,复合薄膜呈黄色。无机的紫外线阻隔剂在PVA薄膜中容易发生颗粒团聚,当Nano-Ti O2的质量分数为2.5%时,复合薄膜的平均紫外线透过率达到2%左右,若再增加质量分数则紫外线透过率变化不大。结论紫外线阻隔剂有效降低了PVA薄膜的紫外线透过率,但同时复合薄膜的透光率降低,雾度上升。综合比较,PVA薄膜中添加Nano-Ti O2的紫外线阻隔效果,比加入相同质量分数的UV-284或Nano-Zn O的复合薄膜要好。     

Dependence of the electrical and optical properties on the bias voltage for ZnO:Al films deposited by r.f. magnetron sputtering

Aluminum-doped zinc oxide (ZnO:Al) thin films were deposited on glass, polycarbonate (PC), and polyethylene terephthalate (PET) substrates by r.f. magnetron sputtering. The substrate dc bias voltage varied from 0 V to 50 V. Structural, electrical and optical properties of the films were investigated. The deposition rate of ZnO:Al films on glass substrate initially increased with the bias voltage, and then decreased with further increasing bias voltage. It was found that the best films on glass substrate with a low as 6.2 × 10^− 4 Ω cm and an average transmittance over 80% at the wavelength range of 500-900 nm can be obtained by applying the bias voltage of 30 V. The properties of the films deposited on polymer substrate, such as PC and PET, have a similar tendency, with slightly inferior values to those on glass substrate.