钛酸酯偶联剂改性纳米ZnO制备MC尼龙6/ZnO复合材料

用钛酸酯偶联剂改性纳米ZnO制备MC尼龙6/纳米ZnO复合材料。当纳米ZnO加入量为2%时,MC尼龙6/纳米ZnO复合材料力学综合性能最优,与纯MC尼龙6相比,其拉伸强度提高28.4%,断裂伸长率提高152.7%,弯曲模量提高30.2%,冲击强度提高60.5%。从SEM分析可见,ZnO在MC尼龙6中分布均匀,达到纳米级分散;从XRD分析可见,纳米ZnO没有改变MC尼龙6的结晶形态。     

纳米氧化锌表面包覆二氧化硅的性能研究

采用直接沉淀法制备了纳米ZnO,以ZnSO4·7H2O和Na2CO3为原料,并用硅酸钠水解生成的SiO2对其进行了表面包覆改性。通过采用红外吸收光谱（FT-IR）,X射线衍射（XRD）对改性前后的ZnO进行表征。结果表明,ZnO表面形成的包覆物是以非晶态形式存在的,改性后纳米ZnO对紫外光的屏蔽性能有所下降,光催化活性明显下降,进一步证明了纳米ZnO颗粒表面存在二氧化硅包覆层,使纳米ZnO稳定化。     

A facile solid-state heating method for preparation of poly(3,4-ethelenedioxythiophene)/ZnO nanocomposite and photocatalytic activity

Poly(3,4-ethylenedioxythiophene)/zinc oxide (PEDOT/ZnO) nanocomposites were prepared by a simple solid-state heating method, in which the content of ZnO was varied from 10 to 20 wt%. The structure and morphology of the composites were characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) absorption spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The photocatalytic activities of the composites were investigated by the degradation of methylene blue (MB) dye in aqueous medium under UV light and natural sunlight irradiation. The FTIR, UV-vis, and XRD results showed that the composites were successfully synthesized, and there was a strong interaction between PEDOT and nano-ZnO. The TEM results suggested that the composites were a mixture of shale-like PEDOT and less aggregated nano-ZnO. The photocatalytic activity results indicated that the incorporation of ZnO nanoparticles in composites can enhance the photocatalytic efficiency of the composites under both UV light and natural sunlight irradiation, and the highest photocatalytic efficiency under UV light (98.7%) and natural sunlight (96.6%) after 5 h occurred in the PEDOT/15wt%ZnO nanocomposite.     

纳米ZnO薄膜掺磷、硼的电学性能研究

用扫描俄歇探针研究了掺杂磷、硼对纳米ZnO薄膜电学性能的影响。结果表明，ZnO薄膜掺入磷或硼后，可以显著降低薄膜电阻；改变扩散温度可以改变磷、硼浓度，从而改变Zn/O化学计量比，Zn/O化学计量比越大，薄膜电阻越小；掺磷或硼的ZnO薄层电阻最低值得的扩散温度分别为850℃和800℃。     

Evaluation of nanocomposite packaging containing Ag and ZnO on shelf life of fresh orange juice

Nanocomposite LDPE films containing Ag and ZnO nanoparticles were prepared by melt mixing in a twin-screw extruder. Packages prepared from the films were then filled with fresh orange juice and stored at 4 °C. Microbial stability, ascorbic acid (AA) content, browning index, color value, and sensory attributes of them were evaluated after 7, 28, and 56 days of storage. Packages containing the nanomaterials, expect 1% nano-ZnO, kept the microbial load of fresh juice below the limit of microbial shelf life (6 log cfu/ml) up to 28 days The least degradation of AA (80.50 mg/100 g), development of brown pigments (OD = 0.23) and losing of color (∆E = 6.0) were observed in pouches containing 0.25% nano-ZnO, after the same time. Sensory attributes were also ranked highest for the juice thus packed in the recent packages after 28 days (p < 0.05). Packages containing nanosilver increased shelf life of fresh juice although part of its sensory attributes were lost.

Industrial relevance

Compared with pure packaging materials, antimicrobial nanocomposite packages containing Ag and ZnO as an alternative non-thermal technology can extend the shelf life of fresh orange juice up to 28 days. However, a certain concentration of nano-ZnO in the packages showed less adverse effects on sensory characteristics.     

纳米氧化锌改性PA6复合材料的制备及性能研究

利用熔融共混法制得了纳米氧化锌改性PA6复合材料,并研究了其有关性质。结果表明:纳米氧化锌能有效改善PA6的力学性能,其添加量在3%时材料力学性能最佳。结晶及热分析研究表明纳米粒子能有效限制PA6分子链段运动,使其结晶度下降。     

分散剂对釉料中Nano—ZnO分散性研究

通过对不同浓度C16-MADS、SDS和六偏磷酸钠3种分散剂对釉料中Nano—ZnO进行分散效果的研究,得出结论：0．7％（质量分数,下同）C16-MADS,4．00％纳米ZnO,粘度0．65;0．5％六偏磷酸钠,4．0％纳米ZnO,粘度0．95;0．8％SDS＋C16-MADS,4．0％ ZnO,粘度0．56。     

纳米ZnO/PDMS复合薄膜力敏特性研究

力学敏感单元作为力学传感检测技术的核心单元,力敏传感技术在航空航天、工程设施、医疗、石油开采等生活、生产的各个领域都存在广泛的应用。研究了纳米ZnO/PDMS复合薄膜的制备,以及复合薄膜在加速度计中的应用。以纳米ZnO颗粒为填充粒子,以聚二甲基硅氧烷（PDMS）为聚合物,采用机械共混法制备了纳米ZnO/PDMS复合薄膜,并研究了复合薄膜的制作工艺、微观结构及力敏特性;并循序渐进地设计了复合薄膜在1G加速度内的力敏特性测试。实验结果表明：加速度计的灵敏度最大可达到0.484pF/g,验证该复合薄膜结构应用到加速度计中的可行性,为基于复合薄膜结构的加速度计力敏效应的验证奠定了理论依据和测试基础。     

超声辐照聚合制备复合乳液—影响反应的几个因素

以V-50为引发剂采用超声辐照乳液聚合制备PMMA／nano-ZnO复合乳液。引发剂用量、乳化剂用量、乳化剂配比、纳米氧化锌的性质、用量以及反应温度、单体含量是本体系超声辐照聚合反应的重要影响因素。这些参数的不同导致了聚合反应的诱导期、转化率不同。含有纳米氧化锌的乳液聚合体系,纳米氧化锌影响了聚合过程中的成核,有未改性纳米氧化锌参与的聚合体系的主要成核方式仍然是胶束成核与均相成核。     

掺杂型ZnOw/纳米ZnO并用对PP性能的影响

研究了铝掺杂氧化锌晶须(ZnOw)和纳米ZnO对聚丙烯共混物力学性能和抗静电性能的影响.结果表明,铝掺杂氧化锌晶须能提高聚丙烯的冲击强度、拉伸强度和表面电阻率.纳米ZnO与掺杂氧化锌晶须并用能协同增强和增韧聚丙烯,纳米ZnO/掺杂氧化锌晶须/聚丙烯的质量比为2/16/82时,共混体系的综合力学性能较好.