共查询到17条相似文献,搜索用时 72 毫秒
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微接触印刷(μCP)是一种能在微纳米尺度上完成表面图案化的技术,主要特点是高效和低成本.研究了μCP过程中印章机械特性和印刷压力对形成的微图案质量的影响.为了进一步分析聚二甲基硅氧烷(PDMS)制作的印章特性,浇注了5种配比的PDMS试样,并进行了单轴拉伸和压缩试验,获得了其应力应变关系.制作了3种配比的表面线型图案印章,实施微接触印刷使其印刷压强在1kPa~1MPa.通过图形化分析对最终的微接触印刷质量进行评估.实验结果表明:最优的压强区间为20~200kPa.较小的压力将会产生印章与基底的间隙,而较大的压力将会导致印章的严重变形.由于质量比为20:1的PDMS印章的弹性模量最小,其在中等压力下的微接触印刷质量最好,而较硬的印章可有效地抵抗印刷中产生的变形. 相似文献
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材料表面自由能对微接触印刷油墨转移过程的影响 总被引:1,自引:0,他引:1
为提高印刷转移效果,以硫醇为研究对象,从理论上分析了理想状况印刷和实际印刷中硫醇的比表面能对其转移率和铺展系数的影响;实验研究了印刷图案精细程度和达到稳定的时间随硫醇浓度的变化情况。结果表明:降低硫醇浓度可降低其比表面能,从而增大转移率和增强在基底表面的铺展效果。为实际应用中硫醇转移过程的控制和改进提供一些指导。 相似文献
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为了在PET基底上制备精细的透明网格状导电图案, 本工作利用微接触印刷高精度的优势, 分别采用线条结构和网格结构的印章转印银纳米粒子导电油墨, 分析了其转印过程, 并讨论了印章结构对网格图案性能的影响。结果表明: 采用线条结构的印章可真实还原印章设计尺寸, 避免了线条的扩展, 有利于提高网格图案的透光率; 同时, 在交叉处墨层较厚可提高导电性。而采用网格结构印章可一次转移快速获得网格图案, 但由于印章网格上相邻线条之间液桥的形成会使图案线宽增加, 降低其透光率; 采用间距较大的印章可使液桥断裂, 得到边缘光滑的网格图案, 但间距增大导致单位面积导电路径减少, 降低其导电性。总之, 采用线条结构印章有利于获得性能较好的网格图案, 但两次转移过程相对复杂, 需用时间较长。 相似文献
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以L-谷氨酸-γ-甲酯(MLG)为A组分,1,2-二氯乙烷为溶剂,聚二甲基硅氧烷(PDMS)为引发剂兼B组分,制成了A-B型二嵌段共聚膜(MSi膜)。经~1HNMR、IR、X-ray等测试方法解析和表征,确认不同共聚组成的A-B型MSi膜形成了明显的微相结构及区域,A、B相区域具有A、B组分均聚物相类似的结构。值得注意的是在A、B相之间形成了具有无规线团(random coil)结构的中间相,且随着B组分含量的增加,A组分规整的α-螺旋(α-helix)结构的破坏程度越大,中间相的区域扩大。 相似文献
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研究了共聚合吡咯和蛋白A(staphylococcal proteinA)修饰传感界面的新方法,用于安培型免疫微传感器检测人免疫球蛋白(immunoglobulin G,IgG)抗原.基于微机电系统(micro electro mechanical systems,MEMS)技术,在硅片上制备带有SU-8微反应池和微型两电极系统的传感芯片,利用电化学循环伏安法,将蛋白A与吡咯掺杂后共聚于工作电极表面,以此固定IgG抗体.优化蛋白A和抗体固定的实验条件,对聚合膜进行了扫描电镜(SEM)成像分析.实验结果表明,该方法操作简便、可控性强,在160S内能够有效固定蛋白A,改善抗体固定效果,与用聚吡咯修饰传感界面的方法相比,检测灵敏度提高约10%,以此实现的安培型免疫微传感器非特异性吸附小,具有较好的重复性和稳定性. 相似文献
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利用射频等离子体增强化学气相沉积(RF-PECVD)技术,以B2H6为掺杂剂,在玻璃衬底上制备了厚度为40nm左右的p型微晶硅薄膜.为获得高电导率高晶化率的薄膜,采用正交实验法对衬底温度、氢稀释比及硼烷掺杂比等主要沉积参数进行初步优化.Raman光谱和电导率测试结果表明:(1)在实验选取的参数范围内,衬底温度是影响薄膜暗电导率和晶化率的最主要因素,其次是氢稀释比,硼烷掺杂比的影响相对较小;(2)通过正交优化,获得了暗电导率为2.05S·cm-1、晶化率为86%的p型微晶硅薄膜. 相似文献
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A. Bernard J. P. Renault B. Michel H. R. Bosshard E. Delamarche 《Advanced materials (Deerfield Beach, Fla.)》2000,12(14):1067-1070
The direct patterning of biomolecules on a solid substrate can be achieved using microcontact printing, a method that has been very successfully adopted for the precise and gentle transfer of proteins and lipid bilayers from stamp to substrate in 1 s, without loss of biological activity. The image shown was produced by patterning 16 different proteins onto the polystyrene surface of a cell culture dish using a stamp inked by means of a microfluidic network. 相似文献
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András Perl David N. Reinhoudt Jurriaan Huskens 《Advanced materials (Deerfield Beach, Fla.)》2009,21(22):2257-2268
Microcontact printing (µCP) offers a simple and low‐cost surface patterning methodology with high versatility and sub‐micrometer accuracy. The process has undergone a spectacular evolution since its invention, improving its capability to form sub‐100 nm SAM patterns of various polar and apolar materials and biomolecules over macroscopic areas. Diverse development lines of µCP are discussed in this work detailing various printing strategies. New printing schemes with improved stamp materials render µCP a reproducible surface‐patterning technique with an increased pattern resolution. New stamp materials and PDMS surface‐treatment methods allow the use of polar molecules as inks. Flat elastomeric surfaces and low‐diffusive inks push the feature sizes to the nanometer range. Chemical and supramolecular interactions between the ink and the substrate increase the applicability of the µCP process. 相似文献
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Xuepu Wang Marcel Sperling Martin Reifarth Alexander Bker 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(11)
A method for the fabrication of well‐defined metallic nanostructures is presented here in a simple and straightforward fashion. As an alternative to lithographic techniques, this routine employs microcontact printing utilizing wrinkled stamps, which are prepared from polydimethylsiloxane (PDMS), and includes the formation of hydrophobic stripe patterns on a substrate via the transfer of oligomeric PDMS. Subsequent backfilling of the interspaces between these stripes with a hydroxyl‐functional poly(2‐vinyl pyridine) then provides the basic pattern for the deposition of citrate‐stabilized gold nanoparticles promoted by electrostatic interaction. The resulting metallic nanostripes can be further customized by peeling off particles in a second microcontact printing step, which employs poly(ethylene imine) surface‐decorated wrinkled stamps, to form nanolattices. Due to the independent adjustability of the period dimensions of the wrinkled stamps and stamp orientation with respect to the substrate, particle arrays on the (sub)micro‐scale with various kinds of geometries are accessible in a straightforward fashion. This work provides an alternative, cost‐effective, and scalable surface‐patterning technique to fabricate nanolattice structures applicable to multiple types of functional nanoparticles. Being a top‐down method, this process could be readily implemented into, e.g., the fabrication of optical and sensing devices on a large scale. 相似文献
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