表面

Abstract(#br)Ultra-High Performance Concrete (UHPC) is characterized by a densely packed mix-design, which can offer attractive surface properties for architectural building facades. A technical challenge for aesthetic applications is the protection against fouling. This work demonstrates that water-repellent concrete can be obtained just after demoulding by replicating the features of micro-pillared moulds made of polydimethylsiloxane (PDMS).

Abstract(#br)The collection of a low vapor pressure chemical simulant triethyl phosphate sorbed onto silica gel (TEP/SG) from a surface with subsequent analysis of the TEP/SG particulates using desorption electrospray ionization–mass spectrometry (DESI–MS) is described. Collection of TEP/SG particulates on a surface was accomplished using a sticky screen sampler composed of a stainless steel screen coated with partially polymerized polydimethylsiloxane (PDMS).

纳米粒子填充聚合物复合材料长期以来一直是人们关注的领域，因为它对复合材料的力学行为具有典型的稳定作用，并增加了诸如降低表面电阻等功能。这些纳米复合材料较新的应用包括将光电功能纳米粒子分散在聚合物基体中，例如将发光纳米晶分散在用于发光太阳能聚光光伏和电致变色板的刚性板中。发光纳米晶在可拉伸聚合物中的分散为应用增加了新的可能性，例如可穿戴健康监测系统、灵活的通信设备等等。为了利用这些纳米复合材料所具有的令人激动的综合性能，迫切需要对其光学效应、力学行为和组分性质之间的相互关系进行评价和理解。这里，我们研究了光亮发光硅纳米晶/聚二甲基硅氧烷( PDMS )纳米复合材料的光学和力学行为，作为纳米晶浓度和纳米晶表面功能性的函数。机械地说，在较高的浓度下，纳米晶的掺入导致纳米复合材料的力学性能大幅降低。结果表明，纳米晶包裹体干扰了聚合物的交联，改变了宿主PDMS的力学行为。