Polymer nanogels grafted from nanopatterned surfaces studied by AFM force spectroscopy.
Polymer nanogels grafted from nanopatterned surfaces studied by AFM force spectroscopy.
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通过 AFM 力谱研究从纳米图案表面接枝的聚合物纳米凝胶。
DOI：
10.1021/la2011953
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Frey,Wolfgang
中科院分区：
文献类型：
--
作者：
Park,Soyeun;Frey,Wolfgang
纳米图案化的交联聚合物对于具有受控机械性能的应用是重要的。接枝的线性和交联的聚二甲基丙烯酰胺凝胶的微米和纳米粒子上创建使用iniferter驱动的准活性自由基聚合与传统的光刻和纳米球光刻相结合。微图案化的线性聚合物在中等接枝密度下再现预期的缩放行为。通过AFM力谱法测定，向聚合溶液中加入交联剂导致早期终止的趋势增加。类似地，纳米图案化的线性聚合物显示出减小的厚度，这与具有减小的横向限制的纳米岛移植物的预期缩放关系一致。交联剂的加入重新引入了本文报道的聚合物长度的一些横向限制。使用一种算法分析了微米和纳米图案化的线性和交联聚合物的机械性能，以客观地确定AFM力谱和两种独立的基于赫兹的分析方法中的接触点。得到的杨氏模量接近那些预期的均匀厚的聚合物膜，是独立的图案尺寸。我们的研究结果表明，聚合物纳米柱与控制的弹性模量可以使用不可逆交联剂制造。他们还强调了成功制造具有定义的机械和结构特性的接枝纳米柱必须考虑的一些因素。
Nanopatterned cross-linked polymers are important for applications with controlled mechanical properties. Grafted linear and cross-linked polydimethylacrylamide gels on micro- and nanopatterns were created using iniferter-driven quasi-living radical polymerization combined with conventional photolithography and nanosphere lithography. Micropatterned linear polymers reproduce the expected scaling behavior at moderate grafting density. The addition of cross-linker to the polymerization solution leads to an increased tendency of early termination as determined by AFM force spectroscopy. Similarly, nanopatterned linear polymers show reduced thickness in agreement with the expected scaling relationship for nanoisland grafts that have reduced lateral confinement. The addition of cross-linker reintroduces some of the lateral confinement for the length of polymers reported here. The mechanical properties of both the micro- and nanopatterned linear as well as cross-linked polymers were analyzed using an algorithm to objectively determine the contact point in AFM force spectroscopy and two independent Hertz-based analysis approaches. The obtained Young’s moduli are close to those expected for homogeneous thick polymer films and are independent of pattern size. Our results demonstrate that polymeric nanopillars with controlled elastic modulus can be fabricated using irreversible cross-linkers. They also highlight some of the factors that must be considered for successful fabrication of grafted nanopillars of defined mechanical and structural properties.
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