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Makinde ZO, van der Heijden NJ, Domigan LJ, McGillivray DJ, Williams DE. Aligned Assembly in a 2-D Gel of a Water-Soluble Peptide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11292-11302. [PMID: 32882136 DOI: 10.1021/acs.langmuir.0c01944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
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.
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Affiliation(s)
- Zainab O Makinde
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
| | - Nadine J van der Heijden
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
| | - Laura J Domigan
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
- Department of Chemical and Materials Engineering, The University of Auckland, Auckland 1010, New Zealand
| | - Duncan J McGillivray
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
| | - David E Williams
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
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Huang X, Dong H, Liu Z, Zhao YP. Probing Micro-Newton Forces on Solid/Liquid/Gas Interfaces Using Transmission Phase Shift. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5442-5447. [PMID: 30916566 DOI: 10.1021/acs.langmuir.8b03922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Many of the nature and life systems are driven by capillary interactions on solid/liquid/gas interfaces. Here, we present a profilometry technique called transmission phase shift for visualizing the liquid/gas interfaces in three dimensions with high resolution. Using this approach, we probe the change in tiny forces with particle radius at a solid/liquid/gas interface. We provide the first direct evidence that in the issues of floating versus sinking at small-scale, Archimedes' principle should be generalized to include the crucial role of surface tension and reveal the dominant regimes of floating particles based on the Bond number. Remarkably, the measured forces are in the range of micro-Newtons, suggesting that this terse methodology may guide the future design of a liquid microbalance and will be a universal tool for investigating capillarity and interface issues.
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Affiliation(s)
- Xianfu Huang
- State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics , Chinese Academy of Sciences , Beijing 100190 , China
- School of Aerospace Engineering , Beijing Institute of Technology , Beijing 100081 , China
- School of Engineering Science , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Huimin Dong
- School of Aerospace Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Zhanwei Liu
- School of Aerospace Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Ya-Pu Zhao
- State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics , Chinese Academy of Sciences , Beijing 100190 , China
- School of Engineering Science , University of Chinese Academy of Sciences , Beijing 100049 , China
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Xiang W, Zhu Z, Zhou L, Wang K, Chen J. Networked Nanogels from Self-Assembly of End-Functionalized Polymers at the Vapor/Liquid Interface: Molecular Dynamics Simulations. MACROMOL THEOR SIMUL 2018. [DOI: 10.1002/mats.201800052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wenjun Xiang
- School of Chemistry and Chemical Engineering; Sichuan University of Arts and Science; Dazhou Sichuan 635000 P. R. China
| | - Zhaoju Zhu
- School of Chemistry and Chemical Engineering; Sichuan University of Arts and Science; Dazhou Sichuan 635000 P. R. China
| | - Lvshan Zhou
- School of Chemistry and Chemical Engineering; Sichuan University of Arts and Science; Dazhou Sichuan 635000 P. R. China
| | - Kun Wang
- School of Chemistry and Chemical Engineering; Sichuan University of Arts and Science; Dazhou Sichuan 635000 P. R. China
| | - Jinhui Chen
- Dong Ying Bureau of Land and Resources; Dongying Shandong 257000 P. R. China
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Knecht V, Reiter G, Schlaad H, Reiter R. Structure Formation in Langmuir Peptide Films As Revealed from Coarse-Grained Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6492-6502. [PMID: 28594565 DOI: 10.1021/acs.langmuir.7b01455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Molecular dynamics simulations in conjunction with the Martini coarse-grained model have been used to investigate the (nonequilibrium) behavior of helical 22-residue poly(γ-benzyl-l-glutamate) (PBLG) peptides at the water/vapor interface. Preformed PBLG mono- or bilayers homogeneously covering the water surface laterally collapse in tens of nanoseconds, exposing significant proportions of empty water surface. This behavior was also observed in recent AFM experiments at similar areas per monomer, where a complete coverage had been assumed in earlier work. In the simulations, depending on the area per monomer, either elongated clusters or fibrils form, whose heights (together with the portion of empty water surface) increase over time. Peptides tend to align with respect to the fiber axis or with the major principal axis of the cluster, respectively. The aspect ratio of the cluster observed is 1.7 and, hence, comparable to though somewhat smaller than the aspect ratio of the peptides in α-helical conformation, which is 2.2. The heights of the fibrils is 3 nm after 20 ns and increases to 4.5 nm if the relaxation time is increased by 2 orders of magnitude, in agreement with the experiment. Aggregates with heights of about 3 or 4.5 nm are found to correspond to local bi- or trilayer structures, respectively.
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Affiliation(s)
- Volker Knecht
- Freiburg Centre for Interactive Materials and Bioinspired Technologies (FIT) , 79110 Freiburg, Germany
| | - Günter Reiter
- Freiburg Centre for Interactive Materials and Bioinspired Technologies (FIT) , 79110 Freiburg, Germany
- Institute of Physics, University of Freiburg , Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Helmut Schlaad
- Institute of Chemistry, University of Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - Renate Reiter
- Freiburg Centre for Interactive Materials and Bioinspired Technologies (FIT) , 79110 Freiburg, Germany
- Institute of Physics, University of Freiburg , Hermann-Herder-Str. 3, 79104 Freiburg, Germany
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Schöne AC, Roch T, Schulz B, Lendlein A. Evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer techniques. J R Soc Interface 2017; 14:20161028. [PMID: 28468918 PMCID: PMC5454283 DOI: 10.1098/rsif.2016.1028] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/05/2017] [Indexed: 12/18/2022] Open
Abstract
Polymeric biomaterials are of specific relevance in medical and pharmaceutical applications due to their wide range of tailorable properties and functionalities. The knowledge about interactions of biomaterials with their biological environment is of crucial importance for developing highly sophisticated medical devices. To achieve optimal in vivo performance, a description at the molecular level is required to gain better understanding about the surface of synthetic materials for tailoring their properties. This is still challenging and requires the comprehensive characterization of morphological structures, polymer chain arrangements and degradation behaviour. The review discusses selected aspects for evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer methods as powerful techniques for studying interfacial properties, such as morphological and degradation processes. The combination of spectroscopic, microscopic and scattering methods with the Langmuir techniques adapted to polymers can substantially improve the understanding of their in vivo behaviour.
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Affiliation(s)
- Anne-Christin Schöne
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
| | - Toralf Roch
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
- Helmholtz Virtual Institute-Multifunctional Biomaterials for Medicine, Kantstrasse 55, 14513 Teltow, Germany
| | - Burkhard Schulz
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
| | - Andreas Lendlein
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
- Helmholtz Virtual Institute-Multifunctional Biomaterials for Medicine, Kantstrasse 55, 14513 Teltow, Germany
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