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Interfacial Shear Strength and Adhesive Behavior of Silk Ionomer Surfaces
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-08-04 00:00:00 , DOI: 10.1021/acs.biomac.7b00790 Sunghan Kim 1 , Ren D. Geryak 1 , Shuaidi Zhang 1 , Ruilong Ma 1 , Rossella Calabrese 2 , David L. Kaplan 2 , Vladimir. V. Tsukruk 1
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-08-04 00:00:00 , DOI: 10.1021/acs.biomac.7b00790 Sunghan Kim 1 , Ren D. Geryak 1 , Shuaidi Zhang 1 , Ruilong Ma 1 , Rossella Calabrese 2 , David L. Kaplan 2 , Vladimir. V. Tsukruk 1
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The interfacial shear strength between different layers in multilayered structures of layer-by-layer (LbL) microcapsules is a crucial mechanical property to ensure their robustness. In this work, we investigated the interfacial shear strength of modified silk fibroin ionomers utilized in LbL shells, an ionic–cationic pair with complementary ionic pairing, (SF)-poly-l-glutamic acid (Glu) and SF-poly-l-lysine (Lys), and a complementary pair with partially screened Coulombic interactions due to the presence of poly(ethylene glycol) (PEG) segments and SF-Glu/SF-Lys[PEG] pair. Shearing and adhesive behavior between these silk ionomer surfaces in the swollen state were probed at different spatial scales and pressure ranges by using functionalized atomic force microscopy (AFM) tips as well as functionalized colloidal probes. The results show that both approaches were consistent in analyzing the interfacial shear strength of LbL silk ionomers at different spatial scales from a nanoscale to a fraction of a micron. Surprisingly, the interfacial shear strength between SF-Glu and SF-Lys[PEG] pair with partially screened ionic pairing was greater than the interfacial shear strength of the SF-Glu and SF-Lys pair with a high density of complementary ionic groups. The difference in interfacial shear strength and adhesive strength is suggested to be predominantly facilitated by the interlayer hydrogen bonding of complementary amino acids and overlap of highly swollen PEG segments.
中文翻译：
丝绸离聚物表面的界面剪切强度和粘合行为
逐层（LbL）微胶囊的多层结构中不同层之间的界面剪切强度是确保其坚固性的关键机械性能。在这项工作中，我们调查的LbL壳利用改性丝纤蛋白的离聚物的界面剪切强度，离子-阳离子对具有互补配对离子，（SF） -聚升谷氨酸（Glu），并且SF-聚升-赖氨酸（Lys），以及由于聚（乙二醇）（PEG）段和SF-Glu / SF-Lys [PEG]对的存在而具有部分筛选的库仑相互作用的互补对。通过使用功能化的原子力显微镜（AFM）尖端以及功能化的胶体探针，可以在不同的空间范围和压力范围下探测处于溶胀状态的这些丝绸离聚物表面之间的剪切和粘附行为。结果表明，这两种方法在分析LbL丝离聚物在从纳米尺度到几分之一微米的不同空间尺度上的界面剪切强度方面都是一致的。出奇，具有部分筛选离子对的SF-Glu和SF-Lys [PEG]对之间的界面剪切强度大于具有高密度互补离子基团的SF-Glu和SF-Lys对之间的界面剪切强度。建议通过互补氨基酸的层间氢键键合和高度溶胀的PEG片段的重叠来促进界面剪切强度和粘合强度的差异。
更新日期：2017-08-05
中文翻译：
丝绸离聚物表面的界面剪切强度和粘合行为
逐层（LbL）微胶囊的多层结构中不同层之间的界面剪切强度是确保其坚固性的关键机械性能。在这项工作中，我们调查的LbL壳利用改性丝纤蛋白的离聚物的界面剪切强度，离子-阳离子对具有互补配对离子，（SF） -聚升谷氨酸（Glu），并且SF-聚升-赖氨酸（Lys），以及由于聚（乙二醇）（PEG）段和SF-Glu / SF-Lys [PEG]对的存在而具有部分筛选的库仑相互作用的互补对。通过使用功能化的原子力显微镜（AFM）尖端以及功能化的胶体探针，可以在不同的空间范围和压力范围下探测处于溶胀状态的这些丝绸离聚物表面之间的剪切和粘附行为。结果表明，这两种方法在分析LbL丝离聚物在从纳米尺度到几分之一微米的不同空间尺度上的界面剪切强度方面都是一致的。出奇，具有部分筛选离子对的SF-Glu和SF-Lys [PEG]对之间的界面剪切强度大于具有高密度互补离子基团的SF-Glu和SF-Lys对之间的界面剪切强度。建议通过互补氨基酸的层间氢键键合和高度溶胀的PEG片段的重叠来促进界面剪切强度和粘合强度的差异。
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