Marine Bioinspired Underwater Contact Adhesion
Marine Bioinspired Underwater Contact Adhesion
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DOI：
10.1021/acs.biomac.6b00300
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发表时间：
2016-05-01
影响因子：
6.2
通讯作者：
Ahn, B. Kollbe
中科院分区：
文献类型：
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作者：
Clancy, Sean K.;Sodano, Antonio;Ahn, B. Kollbe
海洋贻贝和藤壶是固着的生物污损生物，它们在潮湿环境中粘附在许多表面上并保持非常牢固的结合。以前模拟生物湿粘合剂特性的合成方法主要集中在贻贝足蛋白（mfps）中存在的儿茶酚部分，尤其富含界面mfps，例如在贻贝斑块和基质之间的界面处发现的mfp-3和-5。然而，藤壶并不使用多巴来实现湿粘附，而是富含非儿茶酚芳香族残留物。由于这种异常现象，我们对研究含有藤壶水泥蛋白和界面 mfps 关键功能的共聚丙烯酸酯薄膜的初始接触粘合性能很感兴趣，例如芳香族（儿茶酚或非儿茶酚）、阳离子、阴离子和非极性残基。使用具有平冲头接触几何形状的探针粘性测试装置测量共聚物的初始湿接触粘附力。优化的仿生共聚物薄膜的湿接触粘合力在去离子水中接近 15.0 N/cm(2)，在人造海水中接近 9.0 N/cm(2)，比商用压敏胶 (PSA) 胶带（接近 0.1 N/cm(2)）高出 150 倍。此外，在 pH 值接近 7 时获得最大湿接触粘附力，表明其在生物医学应用中的可行性。
Marine mussels and barnacles are sessile biofouling organisms that adhere to a number of surfaces in wet environments and maintain remarkably strong bonds. Previous synthetic approaches to mimic biological wet adhesive properties have focused mainly on the catechol moiety, present in mussel foot proteins (mfps), and especially rich in the interfacial mfps, for example, mfp-3 and -5, found at the interface between the mussel plaque and substrate. Barnacles, however, do not use Dopa for their wet adhesion, but are instead rich in noncatecholic aromatic residues. Due to this anomaly, we were intrigued to study the initial contact adhesion properties of copolymerized acrylate films containing the key functionalities of barnacle cement proteins and interfacial mfps, for example, aromatic (catecholic or noncatecholic), cationic, anionic, and nonpolar residues. The initial wet contact adhesion of the copolymers was measured using a probe tack testing apparatus with a flat-punch contact geometry. The wet contact adhesion of an optimized, bioinspired copolymer film was similar to 15.0 N/cm(2) in deionized water and similar to 9.0 N/cm(2) in artificial seawater, up to 150 times greater than commercial pressure-sensitive adhesive (PSA) tapes (similar to 0.1 N/cm(2)). Furthermore, maximum wet contact adhesion was obtained at similar to pH 7, suggesting viability for biomedical applications.