混合材料

Abstract(#br)Due to its elasticity, transparency and biocompatibility, polydimethylsiloxane (PDMS) has been used as an organic component of hybrid materials in different fields of application such as photonics or biomaterials. Typically an acidic medium is used in the sol–gel processing of PDMS–metal oxide systems due to its catalytic effect. Furthermore, when dealing with highly reactive transition metal alkoxides, a chelating agent is pointed out as being necessary to avoid phase separation.

Abstract(#br)Organic–inorganic materials have been the object of intense research due to their wide range of properties and therefore innumerous applications. We prepared organic–inorganic hybrid materials by direct energy deposition on a mixture of polydimethylsiloxane silanol terminated (33\u003cce:hsp sp=\"0.25\"/\u003ewt% fixed content), tetraethylorthosilicate and a minor content of zirconium propoxide that varied from 1 to 5\u003cce:hsp sp=\"0.25\"/\u003ewt% using gamma radiation from a Co-60 source. The samples, dried in air at room temperature, are bulk, flexible and transparent.

摘要 本论文的目的是研究含CaO和P2 O5的SiO2基生物活性杂化材料在其结构中的溶解机理，以及在降解过程中磷灰石结晶对杂化材料表面特性的影响。采用溶胶-凝胶法制备了杂化材料。以正硅酸乙酯( TEOS )、端羟基聚二甲基硅氧烷( PDMS )、Ca ( NO3 ) 2·4H2O和磷酸三乙酯( TEP )为反应物。将样品浸泡于模拟体液( SBF )中，测试其降解性能和生物活性。利用拉曼光谱、张力仪和N2吸附/脱附曲线测定降解过程中的变化。采用多种数学方法对结果进行了分析。SiO2改性PDMS-P2O5 - CaO杂化材料表面磷灰石层的生长伴随着SiO2基基体的降解。溶解动力学取决于材料的组成。它从低P2 O5样品的表面驱动机制转变为符合Weibull动力学模型的降解路径，典型的是富P2 O5材料中的基质溶解过程。在降解过程中，测定了孔隙的表面参数、分形常数和各向异性。低含量P2 O5材料的分形常数略有增加，表明在降解的第一阶段形成了均一的类硅层，为后续磷灰石的形成提供了锚定核。在所有的情况下，降解会导致墨瓶状孔隙，随着降解的进行，其体积增大，但保持其颈部形状。

Abstract(#br)To exploit the application potential of Ag nanoparticles (AgNPs) in optical limiting materials, it is significant to develop AgNPs doped polymeric hybrid materials. In this paper, spherical AgNPs were prepared using the seeding growth method. An additional silica coating was employed to obtain the Ag@SiO 2 core-shell materials. Then Ag@SiO 2 was doped into polydimethylsiloxane(PDMS) rubbers to investigate their optical limiting property to laser at 532\u003cce:hsp sp=\"0.25\"/\u003enm.

摘要\n可伸缩和灵活的电子设备可以穿在人体上，也可以融入服装。它们在可穿戴电子、柔性显示器和可伸展电路领域有很好的应用前景。这里报道了一种基于多壁碳纳米管( MWCNTs )包复氧化锌( ZnO )纳米颗粒( NPs )并嵌入聚二甲基硅氧烷的智能传感器。基于MWCNT / ZnO纳米杂化粒子的智能传感器可以测量较宽的温度范围( 0 ~ 100℃)，MWCNT浓度和ZnO NP尺寸的选择使得传感器对温度变化和其他变形表现出稳定的线性响应，具有较高的选择性。该智能传感器具有负温度系数，灵敏度为-33.6 kΩ℃-1，采用不同尺寸的ZnO NP测量传感器的弯曲运动灵敏度，可调谐范围为33.3 ~ 138.89 kΩ度-1。