Aligned Assembly in a 2-D Gel of a Water-Soluble Peptide.,Langmuir

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Aligned Assembly in a 2-D Gel of a Water-Soluble Peptide.
Langmuir ( IF 3.7 ) Pub Date : 2020-09-03 , DOI: 10.1021/acs.langmuir.0c01944
Zainab O Makinde _{1,

2} , Nadine J van der Heijden _{1,

2} , Laura J Domigan _{2,

3} , Duncan J McGillivray _{1,

2} , David E Williams _{1,

2}

Affiliation

We demonstrate the assembly of a compact, gel-like Langmuir–Blodgett film of rods formed by self-assembly of a β-sheet-forming water-soluble peptide, Ac-IKHLSVN-NH₂, at the surface of aqueous electrolytes. We characterize surface pressure hysteresis and demonstrate shear stiffening of the surface caused by area cycling, which we interpret as due to rearrangement and alignment of the rods. We show strong effects of the electrolyte on the assembly of the elementary rods, which can be related to the Hofmeister series and interpreted by effects on the interaction energies mediated by ions and water. Formation of β-sheet structures and assembly of these into surface-segregated semicrystalline gels was strongly promoted by ammonium sulfate electrolyte. With ammonium sulfate electrolyte as subphase for Langmuir–Blodgett film deposition, shear stiffening by surface area cycling resulted in very compact films on transfer to a substrate.

中文翻译：

在水溶性肽的二维凝胶中排列的组件。

我们演示了杆的致密，凝胶状Langmuir–Blodgett膜的组装，该膜由形成β-折叠的水溶性肽Ac-IKHLSVN-NH _2的自组装形成，在水性电解质的表面。我们表征了表面压力的滞后现象，并演示了由于面积循环而引起的表面剪切硬化，我们将其解释为是由于棒的重新排列和对齐而引起的。我们显示了电解质对基础棒组装的强烈影响，这可能与霍夫迈斯特系列有关，并且可以通过对离子和水介导的相互作用能的影响来解释。硫酸铵电解质大大促进了β-折叠结构的形成以及将其组装成表面分离的半结晶凝胶。用硫酸铵电解质作为Langmuir-Blodgett膜沉积的子相，通过表面积循环的剪切硬化导致非常紧凑的膜转移到基材上。

更新日期：2020-09-29

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