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    【24h】Investigation on Micro-patterned Gold Plated Polymer Substrate for a Micro Hydraulic Actuator

    机译微型液压执行机构的微图案镀金聚合物基板的研究

    【摘要】Plants have the ability to develop large mechanical force from chemical energy available with bio-fuels. The energy released by the cleavage of a terminal phosphate ion during the hydrolysis of a bio-fuel assists the transport of ions and fluids in cellular homeostasis. Materials that develop pressure and hence strain similar to the response of plants to an external stimuli are classified as riastic materials. This new class of actuators use protein transporters as functional units to move species and result in deformation [Leo et al 2005 (Proceedings of IMECE - 06)]. The ion transporters are hydrocarbons which are formed across the cellular membranes. The membranes that house the ion transporters are aggregates of phospholipids rigidized by cytoskeleton. Reconstituting these nano-machines on a harder matrix is quintessential to build a functional device. Artificial phospholipid membranes or Biliayer lipid membranes (BLM) have poor structural integrity and do not adhere to most surfaces. Patterned arrays of pores made on Poly-propylene glycol-diacrylate (PPG-DA) substrate, a photo curable polymer was made available to us for initial design iterations for an actuator. Hydrophobicity of PPG-DA posed initial problems to support a BLM. We modified the surface of micropatterned PPG-DA membrane by gold plating it. The surface of the porous PPG-DA membranes was plated with gold (Au). A 10nm seeding layer of Au was sputtered on the surface of the membrane. Further gold was reduced onto the sputtered gold surface [Supriya et al(Langmuir 2004, 20, 8870-8876)] by suspending the samples in a solution of hydroxylamine and Hydrogen tetrachloroaurate(III) trihydrate [HAuC14.3H2O]. This reduction process increased the thickness of the gold, enhanced its adhesion to the PPG-DA substrate and improved the shapes of the pores. This surface modification of PPG-DA helped us form stable BLM with l-Palmitoyl-2-Oleoyl-sn-Glycero-3- [Phospho-L-Serine] (Sodium Salt) (POPS), 1-Palmitoyl-2-Oleoyl-sn-Glycero- 3-Phosphoethanolamine (POPE) lipids. The observed ionic resistance of the BLM remained stable and sustained 4 mm water column for the the four hours observation period. This article describes the procedure we adopted to modify the PPG-DA substrate, form a BLM and the procedure to quantify the stability of the BLM formed with -amine and -thiol head groups in the lipids.

    【摘要机译】植物具有利用生物燃料可利用的化学能发展出巨大机械力的能力。在生物燃料水解过程中,末端磷酸根离子裂解所释放的能量有助于离子和液体在细胞体内平衡中的运输。产生压力并因此产生类似于植物对外部刺激的反应的应变的材料被归类为敏感材料。这类新的致动器使用蛋白质转运蛋白作为功能单位来移动物种并导致变形[Leo et al 2005(IMECE会议录-06)]。离子转运蛋白是在细胞膜上形成的碳氢化合物。容纳离子转运蛋白的膜是被细胞骨架硬化的磷脂聚集体。在更硬的基质上重建这些纳米机器对于构建功能设备至关重要。人工磷脂膜或胆脂膜(BLM)具有较差的结构完整性,不能粘附在大多数表面上。在聚丙二醇二丙烯酸酯(PPG-DA)基板上制作的孔的图案阵列,可光固化的聚合物可用于执行器的初始设计迭代。 PPG-DA的疏水性为支持BLM提出了最初的问题。我们通过镀金修饰了微图案PPG-DA膜的表面。 PPG-DA多孔膜的表面镀有金(Au)。在膜的表面上溅射10nm的Au晶种层。通过将样品悬浮在羟胺和三水合四氯金酸氢盐(III)溶液[HAuC14.3H2O]中,将更多的金还原到溅射的金表面上[Supriya et al(Langmuir 2004,20,8870-8876)]。这种还原过程增加了金的厚度,增强了其对PPG-DA基材的附着力,并改善了孔的形状。 PPG-DA的这种表面修饰帮助我们与l-Palmitoyl-2-Oleoyl-sn-Glycero-3- [Phospho-L-Serine](钠盐)(POPS),1-Palmitoyl-2-Oleoyl- sn-甘油-3-磷酸乙醇胺(POPE)脂质。在四个小时的观察期内,观察到的BLM的离子电阻保持稳定并维持4 mm水柱。本文介绍了我们用来修饰PPG-DA底物,形成BLM的程序,以及量化由脂质中的-胺和-硫醇头基形成的BLM稳定性的程序。

    【作者】Vishnu Baba Sundaresan;Barbar Akle;Donald J Leo;

    【作者单位】Mechanical Engineering Department, Virginia Tech, Blacksburg. Virginia - 24061;

    【年(卷),期】2006(),

    【年度】2006

    【页码】P.61701U.1-61701U.9

    【总页数】9

    【原文格式】PDF

    【正文语种】eng

    【中图分类】TB30;

    【关键词】active materials;nastic structures;proton transporters;micro-hydraulic actuation;

    机译 活性材料;鼻部结构;质子转运体;微液压驱动;
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