纳米复合材料

Abstract(#br)A novel method based on ex situ dispersion of silver nanoparticles within the monomers and subsequent emulsion polymerization using water-in-sc-CO 2 medium is introduced in this paper. Silver nanoparticles were synthesized by chemical reduction of silver nitrate using sodium borohydrate as a reducing agent and polydimethylsiloxane (PDMS) as a stabilizer in the water-in-sc-CO 2 medium.

Abstract(#br)Superhydrophobic and oleophobic polydimethylsiloxane (PDMS)–silica nanocomposite double layer coating was fabricated by applying a thin layer of low surface energy fluoroalkyl silane (FAS) as topcoat. The coatings exhibited WCA of 158–160° and stable oleophobic property with oil CA of 79°. The surface morphology was characterized by field emission scanning electron microscopy (FESEM) and surface chemical composition was determined by energy dispersive X-ray spectrometery (EDX) and X-ray photoelectron spectroscopy (XPS).

Abstract(#br)This study explores the radiation characteristics of carbon nanotubes-based polymer composite for high-energy proton shielding applications in aerospace industry. Nanocomposites of single-walled carbon nanotubes (SWCNTs) dispersed in polydimethylsiloxane (PDMS) were tested under monoenergetic proton beams. The stopping ranges of the nanocomposite (PDMS/SWCNT) were calculated and compared to those of the pure PDMS and aluminum (Al).

Abstract(#br)We print complex curvilinear microstructures in an elastomer matrix using a ferrofluid droplet as the print head. A magnetic field moves the droplet along a prescribed path in liquid polydimethylsiloxane (PDMS). The droplet sheds magnetic nanoparticle (MNP) clusters in its wake, forming printed features. The PDMS is subsequently heated so that it crosslinks, which preserves the printed features in the elastomer matrix.

Abstract(#br)Bioinspired dry adhesives with protruding tips offer strong, repeatable, and reversible adhesion both in normal and shear directions owing to the presence of a thin spatulate layer. However, the temperature range in which they can be used is limited because most of them are made of polymeric materials that have inherently poor thermomechanical stability. Here, we report a nanocomposite dry adhesive as a high-temperature reversible adhesive with high pull-off strength.

Abstract(#br)In this paper, we develop a new type of polydimethylsiloxane (PDMS)-based nanocomposite by incorporating carboxyl-functionalized multi-walled nanotube (MWCNT) to the polymer matrix as fillers. The dispersion of MWCNT during the material processing plays a significant role in deciding the final properties of the nanocomposites. A rapid evaporation and stirring method was used to minimize re-aggregation of the fillers during MWCNT/PDMS composites fabrication processing by solution blending.

Abstract(#br)Over the last two decades, it has become increasingly unarguable that the addition of a small amount of nanoparticles to elastomers can lead to a drastic enhancement of their elastic response not only at small deformations but, more importantly, at large deformations.

Abstract(#br)Strain sensors with high sensitivity and large stretchability are of interest in various engineering fields. Here, directly printed stretchable strain sensors with great sensitivity and high durability was fabricated using aerodynamically focused nanomaterials (AFN) printing system. Specifically, microscale porous conductive patterns composed of silver nanoparticles (AgNPs) and multi-walled carbon nanotubes (MWCNTs) composites are printed onto polydimethylsiloxane (PDMS) for stretchable strain sensor.

摘要 本论文研究了石墨烯纳米片( GNP )与双链DNA的纳米复合材料作为紫外光敏材料，由于其具有良好的电学性能，同时结合DNA对紫外光的化学敏感性，特别是对能量较高的UV-C波段。在柔性聚二甲基硅氧烷( PDMS )基体中嵌入石墨烯-DNA填料，采用滴注法制备纳米复合膜。由于纳米复合材料的传感性能受填料分散量和均匀性的影响较大，为了提高石墨烯- DNA元素在聚合物基体中的分散性，对其合成工艺进行了优化。采用互补技术研究了GNP-DNA / PDMS薄膜在UV-C辐射前后的电学、热学性能以及表面形貌和润湿性。研究结果揭示了这些新型功能纳米复合材料在高致命紫外辐射环境中的潜在应用。

Abstract(#br)Oil spill accidents and industrial oily wastewater are threatening all living species in the ecological system. Development of materials with special wettability for oil/water separation has been the subject of many researches. Herein, superhydrophobic and superoelophilic nanocomposite coatings, based on titanium dioxide (TiO 2 ) nanoparticles and polydimethylsiloxane (PDMS), were applied on metal meshes with different pore sizes (25 and 100 μm). Morphological analysis revealed that adding PDMS, as a binder, significantly changes the surface structure of the coatings.