纳米粒子

Abstract(#br)Aging in water of a TiO 2 -based nanocomposite used in sunscreen cosmetics has been studied as a function of light and time. It consisted initially in a TiO 2 core, coated with Al(OH) 3 and polydimethylsiloxane (PDMS) layers. Size measurement, coating alteration, and surface charge were followed by laser diffraction, TEM/EDS, ICP-AES and electrophoretic mobility measurement.(#br)The nanocomposite rapidly underwent progressive dispersion in the aqueous phase, enabled by the dissolution of the PDMS layer.

Abstract(#br)The ability to fabricate flexible filtration membranes that can selectively separate particles of different sizes is of considerable interest. In this article, we describe a facile, reproducible and simple one-step method to produce pores in polydimethylsiloxane (PDMS) membranes. We embedded micron-sized NaHCO 3 particles in 50\u003cce:hsp sp=\"0.25\"/\u003eμm thick PDMS films. After curing, the membranes were immersed in concentrated HCl acid. Pores were generated in the membrane by the evolution of CO 2 gas from the reaction of NaHCO 3 and HCl.

Abstract(#br)A novel optofluidic surface-enhanced Raman scattering (SERS) chip was specially designed and fabricated using polydimethylsiloxane (PDMS) and embedded with normal silica multi-mode optical fibers. Unlike in a conventional Raman detection configuration where an angle of 90° is commonly adopted, here the orientations of the excitation fiber and the collection fiber was set at such an obtuse angle so that the light beam from the excitation fiber can illuminate the endface, but is not within the acceptance angle of the collection fiber.

Abstract(#br)Laser-generated-focused ultrasound (LGFU) holds promise for the high-precision ultrasound therapy owing to its tight focal spot, broad frequency band, and stable excitation with minimal ultrasound-induced heating. We here report the development of the LGFU as a stimulus for promoted drug release from microgels integrated with drug-loaded polymeric nanoparticles.

Abstract(#br)The fabrication and characterization of a localized surface plasmon resonance (LSPR) based optical nanosensor, which utilizes highly ordered gold nanoparticles as transducers are presented in this work. The nanoparticles are synthetized using nanodimpled aluminium templates, which were prepared by a selective chemical etching of the porous anodic alumina grown over an aluminium sheet. The formed nanoparticles were directly transferred to PDMS (polydimethylsiloxane) based microfluidic cells, where their LSPR transmittance spectra were measured.

摘要( # br )在薄晶圆的临时键合和脱粘过程中，要保证键合层具有可靠的粘结性能，且脱粘过程要可控。我们提出了一种基于壁虎仿生黏附结构的晶圆键合层，该键合层由碳量子点( CDs )和聚二甲基硅氧烷( PDMS )组成，表面具有单层微柱阵列。与纯PDMS制成的粘接层相比，PDMS-CDs表面可大大提高粘接强度。此外，掺杂的CDs使仿生表面对温度敏感，因此其表面附着力受温度变化的控制。随着温度的升高，表面附着力明显下降，使得脱粘成为可能。本研究在变温条件下，研究了PDMS-CDs在毫米和纳米尺度下的表面粘附性能。

In this work, surface acoustic wave (SAW) sensors with two types of polymer sensing films, polyethyleneimine (PEI) and polydimethylsiloxane (PDMS), containing embedded ZnO, TiO\u003csub\u003e2\u003c/sub\u003e, and WO\u003csub\u003e3\u003c/sub\u003e nanoparticles (NPs) for detecting volatile organic compounds (VOCs) were produced and studied. The NPs were obtained using the pulsed laser ablation method, with the same deposition conditions used for all three materials studied.

In order to change the refractive index of polydimethylsiloxane (PDMS), TiO nanoparticles were added to obtain a TiO/PDMS composite. The refractive index of the PDMS composite increased by up to 0.008 by adding 1.0 wt% TiO nanoparticles to PDMS. By 1.0-MeV proton beam irradiation, the TiO/PDMS composite shows increased refractive index up to by 0.012 for 1.0 wt% TiO/PDMS composite with fluence of 100 nC/mm.

演示一种替代冲洗和擦拭( RR )方法清洗软隐形眼镜外表面污染物。该技术是利用聚二甲基硅氧烷( PDMS )的弹性特性，通过非粘着解胶的方法物理去除接触镜片表面的污染物，称为聚合物污染物去除技术( PoPPR )。采用PoPPR方法，以市售的多用途镜片清洗液为对照，研究了3种不同配比( 1：30、1：40和1：50 )的定形剂与聚合物PDMS的配比。采用花粉( 25 ~ 40μm )、微珠( 1 ~ 5μm )和纳米颗粒( 5 ~ 10 nm ) 3种不同粒径的模拟污染物对两种清洗方法的有效性进行了测试。记录各接触镜片去除污染物的分数并进行显著性评价，发现PDMS 1∶40为PoPPR法清洗镜片的最佳配比。对于较大颗粒( \u003e 10μm )，常规RR法与PoPPR法无差异( p \u003e 0.05 )。然而，与RR方法相比，新的PoPPR技术对PM2.5小颗粒( \u003c 2.5μm )的去除效果明显更好，特别是对微球( p = 0.006 )和纳米颗粒( p \u003c 0.001 )，这一概念证明工作表明，PoPPR方法清洗隐形眼镜的效果与传统的花粉等大颗粒清洗方法一样。PoPPR法更有效地去除极细颗粒污染物，包括微塑料和纳米颗粒。这种方法提供了一种潜在的更有效的清洁方案，可以加强接触镜使用者，特别是那些生活在空气污染严重地区的使用者的安全、健康和舒适。