Nanocomposite Films of Laponite/PEG-Grafted Polymers and Polymer Brushes with Nonfouling Properties,Langmuir

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Nanocomposite Films of Laponite/PEG-Grafted Polymers and Polymer Brushes with Nonfouling Properties
Langmuir ( IF 3.7 ) Pub Date : 2017-06-27 00:00:00 , DOI: 10.1021/acs.langmuir.7b00534
Ekram Wassel ₁ , Martha Es-Souni _{1,

2} , Nele Berger ₁ , Dimitri Schopf ₁ , Matthias Dietze ₁ , Claus-Henning Solterbeck ₁ , Mohammed Es-Souni ₁

Affiliation

We explore the suitability of nanocomposite thin films based on laponite nanomaterial and grafted antiadhesive polymers as transparent nonfouling surfaces. For this purpose, two polymers were chosen: a linear poly(ethylene glycol) (PEG) silane, 2-[methoxy(polyethyleneoxy)propyl]-trimethoxysilane), and thermoresponsive poly(oligo ethylene glycol)-methyl ether-methacrylate (POEGMA) brushes. PEG silane was grafted on the laponite nanoparticles in solution yielding homogeneous and transparent thin films via a dip coating procedure on glass and silicon substrates. POEGMA was grafted on laponite-(3-Aminopropyl)trimethoxysilane (APTMS) nanocomposite films that were processed similarly to PEG-silane using atom transfer radical polymerization (ATRP). Film characterization with, among others, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM) attests to successful grafting of the polymers to the laponite nanoparticles. In particular, evidence of basal plane expansion of laponite with increasing silane concentration are obtained using XRD, while patent morphological changes are revealed with AFM. The results are discussed in terms of the different grafting sites on laponite and compared with literature. While LP-PEG-silane is easily applied to a surface from a precursor solution via a dip coating procedure LP-APTMS-OEGMA requires lots more chemicals, a thorough control of reaction parameters, and longer reaction time in order to generate films with the desirable properties. We therefore also addressed the antifouling properties of the films. These were tested together with control samples of bare glass and laponite thin films for 30 days in an algae container. More tests were conducted with fibroblast cell cultures. Our preliminary results show that grafting of PEG containing polymers and polymer brushes alters the properties of the laponite films from fouling to nonfouling surfaces. As a first estimate, the adhesion of particles (diatoms, algae, etc.) to surfaces is reduced by approximately 85% in the case of LP-PEG-silane and up to 92% in the case of LP-APTMS-POEGMA, in comparison to the control surfaces. Furthermore, practically no cell adhesion on such surfaces could be observed.

中文翻译：

Laponite / PEG接枝的聚合物和具有防污性能的聚合物刷的纳米复合薄膜

我们探索基于皂石纳米材料和接枝抗粘聚合物作为透明防污表面的纳米复合薄膜的适用性。为此，选择了两种聚合物：线性聚（乙二醇）（PEG）硅烷，2- [甲氧基（聚乙氧基）丙基]-三甲氧基硅烷）和热敏性聚（低聚乙二醇）-甲基醚-甲基丙烯酸酯（POEGMA）刷子。通过在玻璃和硅基板上进行浸涂工艺，将PEG硅烷以溶液形式接枝到合成锂皂石纳米粒子上，从而生成均匀且透明的薄膜。POEGMA接枝在锂皂石-（3-氨基丙基）三甲氧基硅烷（APTMS）纳米复合膜上，该膜使用原子转移自由基聚合（ATRP）与PEG-硅烷类似地进行了处理。使用傅里叶变换红外（FT-IR）光谱对薄膜进行表征，X射线衍射（XRD）和原子力显微镜（AFM）证明了将聚合物成功接枝到锂皂石纳米颗粒上。尤其是，使用XRD获得了随着硅烷浓度增加而合成锂皂石的基础面膨胀的证据，而使用AFM揭示了专利形态的变化。讨论了在皂石上不同接枝位置的结果，并与文献进行了比较。尽管可以通过浸涂工艺轻松地将LP-PEG-硅烷从前体溶液中施涂到表面上，但LP-APTMS-OEGMA需要更多的化学物质，对反应参数的彻底控制以及更长的反应时间，才能生成具有所需膜的薄膜特性。因此，我们还讨论了膜的防污性能。将它们与裸露玻璃和皂石薄膜的对照样品一起在藻类容器中测试30天。用成纤维细胞培养进行了更多的测试。我们的初步结果表明，含PEG的聚合物和聚合物刷的接枝改变了皂石薄膜的性能，从污垢表面变为无污垢表面。初步估算，在LP-PEG-硅烷的情况下，颗粒（硅藻，藻类等）对表面的附着力降低约85％，在LP-APTMS-POEGMA的情况下，降低至92％。与控制面的比较。此外，实际上没有观察到细胞在这种表面上的粘附。我们的初步结果表明，含PEG的聚合物和聚合物刷的接枝改变了皂石薄膜的性能，从污垢表面变为无污垢表面。初步估算，在LP-PEG-硅烷的情况下，颗粒（硅藻，藻类等）对表面的粘附力降低约85％，在LP-APTMS-POEGMA的情况下，降低至92％。与控制面的比较。此外，实际上没有观察到细胞在这种表面上的粘附。我们的初步结果表明，含PEG的聚合物和聚合物刷的接枝改变了皂石薄膜的性能，从污垢表面变为无污垢表面。初步估算，在LP-PEG-硅烷的情况下，颗粒（硅藻，藻类等）对表面的粘附力降低约85％，在LP-APTMS-POEGMA的情况下，降低至92％。与控制面的比较。此外，实际上没有观察到细胞在这种表面上的粘附。

更新日期：2017-06-28

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