1
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Affiliation(s)
- Jose D. Delgado
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Joseph B. Schlenoff
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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2
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Ultra-slow diffusion of hexacyanoferrate anions in poly(diallyldimethyl ammonium chloride)-poly(acrylic acid sodium salt) multilayer films. J Colloid Interface Sci 2019; 539:306-314. [DOI: 10.1016/j.jcis.2018.12.073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 12/17/2018] [Accepted: 12/18/2018] [Indexed: 11/19/2022]
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3
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Frueh J, Rühm A, He Q, Möhwald H, Krastev R, Köhler R. Elastic to Plastic Deformation in Uniaxially Stressed Polylelectrolyte Multilayer Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11933-11942. [PMID: 30125507 DOI: 10.1021/acs.langmuir.8b01296] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Polyelectrolyte multilayer (PEM) are thin polymeric films produced by alternating adsorption of positively and negatively charged polyelectrolytes (PE) on a substrate. These films are considered drug delivery agents as well as coating material for implants, due to their antibiofouling and biologically benign properties. For these reasons the film mechanical properties as well as response to mechanical stress are important measurement parameters. Especially intriguing is the correlation of the mechanical properties of PEM on macroscopic level with the structure of PEM on molecular level, which is addressed here for the first time. This study investigates PEM from PDADMA/PSS produced by spraying technique with neutron and X-ray reflectometry. Reflectometry technique provides precise information on thickness and density (i.e., electron density or scattering length density, respectively), and, this way, allows to conclude on changes in film composition. Thus, neutron and X-ray reflectometry technique is suitable to investigate the overall and the internal transformations, which PEM films might undergo upon exposure to mechanical load. During uniaxial elongation two regimes of PEM-deformation can be observed: An elastic regime at small elongations (below ca. 0.2%), which is characterized by a reversible change of film thickness, and a plastic regime with a permanent change above this limit. Both regimes have in common, that the mechanical load induces an increase of the film thickness, which is accompanied by an uptake of water from the surrounding atmosphere. The strain causes a molecular rearrangement within the PEM-structure of stratified layers, which, even in elastic regime, is permanent, although the thickness change remains reversible.
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Affiliation(s)
- Johannes Frueh
- Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Micro/Nano Technology Research Centre , Harbin Institute of Technology , Yikuang Street 2 , Harbin 150080 , China
| | - Adrian Rühm
- Max-Planck Institute for Intelligent Systems (formerly Max-Planck Institute for Metals Research) , ZWE FRM II, Heisenbergstraße 3 , D-70569 Stuttgart , Germany
| | - Qiang He
- Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Micro/Nano Technology Research Centre , Harbin Institute of Technology , Yikuang Street 2 , Harbin 150080 , China
| | - Helmuth Möhwald
- Max-Planck Institute of Colloids and Interfaces , Dept. Interfaces , Am Mühlenberg 1 , 14424 Golm/Potsdam , Germany
| | - Rumen Krastev
- NMI Natural and Medical Sciences Institute at the University of Tübingen , Markwiesenstraße 55 , 72770 Reutlingen , Germany
- Faculty of Applied Chemistry , Reutlingen University , Alteburgstraße 150 , 72762 Reutlingen , Germany
| | - Ralf Köhler
- Max-Planck Institute of Colloids and Interfaces , Dept. Interfaces , Am Mühlenberg 1 , 14424 Golm/Potsdam , Germany
- Helmholtz Centre Berlin for Materials and Energy , Inst. Soft Matter and Functional Materials , Hahn-Meitner-Platz 1 , 14109 Berlin , Germany
- Stranski-Laboratorium for Physical and Theoretical Chemistry , Berlin University of Technology (TU Berlin) , Straße des 17. Juni 124 , D-10623 Berlin , Germany
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4
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Chen XC, Huang WP, Ren KF, Ji J. Self-Healing Label Materials Based on Photo-Cross-Linkable Polymeric Films with Dynamic Surface Structures. ACS NANO 2018; 12:8686-8696. [PMID: 30106556 DOI: 10.1021/acsnano.8b04656] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Spatially controlling the evolution of surface structures may provide an effective strategy for patterning surface roughness and facilitating the construction of various functional surfaces. In this study, we report a photo-cross-linkable polymeric film with dynamic surface micro/nanostructures. The surface structures of the un-cross-linked regions can be eliminated under saturated humidity, which can be utilized to create patterned roughness on the film. One potential application of this patternable platform is as a "smart" label material for graphical symbols. Various graphical symbols can be programmed onto this film by partially erasing its surface roughness, enabling visibility due to the difference in light scattering between different areas of the film. When a thus-prepared label was blurred by mechanical scratches, it could be healed under saturated humidity, and its original readability could be fully restored. Furthermore, the patterned rough surface created using our approach can also be very useful in many other research fields, such as surface wettability and cell behavior manipulation.
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Affiliation(s)
- Xia-Chao Chen
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , P.R. China
| | - Wei-Pin Huang
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , P.R. China
| | - Ke-Feng Ren
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , P.R. China
| | - Jian Ji
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , P.R. China
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5
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Helfricht N, Doblhofer E, Bieber V, Lommes P, Sieber V, Scheibel T, Papastavrou G. Probing the adhesion properties of alginate hydrogels: a new approach towards the preparation of soft colloidal probes for direct force measurements. SOFT MATTER 2017; 13:578-589. [PMID: 27976776 DOI: 10.1039/c6sm02326f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The adhesion of alginate hydrogels to solid surfaces was probed by atomic force microscopy (AFM) in the sphere/plane geometry. For this purpose a novel approach has been developed for the immobilization of soft colloidal probes onto AFM-cantilevers, which is inspired by techniques originating from cell biology. The aspiration and consecutive manipulation of hydrogel beads by micropipettes allows the entire manipulation sequence to be carried-out in situ. Hence, any alteration of the hydrogel beads upon drying can be excluded. The adhesive behaviour of alginate hydrogels was first evaluated by determining the distribution of pull-off forces on self-assembled monolayers (SAMs) terminating in different functional groups (-CH3, -OH, -NH2, -COOH). It was demonstrated that solvent exclusion plays practically no role in the adhesion process, in clear difference to solid colloidal probes. The adhesion of alginate beads is dominated by chemical interactions rather than solvent exclusion, in particular in the case of amino-terminated SAMs. The data set acquired on the SAMs provided the framework to relate the adhesion of alginate beads on recombinant spider silk protein films to specific functional groups. The preparation of soft colloidal probes and the presented approach in analysing the adhesive behaviour is not limited to alginate hydrogel beads but can be generally applied for probing and understanding the adhesion behaviour of hydrogels on a wide range of substrates, which would be relevant for various applications such as biomedical surface modification or tissue engineering.
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Affiliation(s)
- Nicolas Helfricht
- Physical Chemistry/Physics of Polymers, University of Bayreuth, Universitätsstr. 30, Bayreuth 95440, Germany.
| | - Elena Doblhofer
- Biomaterials, University of Bayreuth, Universitätsstr. 30, Bayreuth 95440, Germany
| | - Vera Bieber
- Physical Chemistry/Physics of Polymers, University of Bayreuth, Universitätsstr. 30, Bayreuth 95440, Germany.
| | - Petra Lommes
- Chemistry of Biogenic Resources, Technical University Munich, Schulgasse 16, 94315 Straubing, Germany
| | - Volker Sieber
- Chemistry of Biogenic Resources, Technical University Munich, Schulgasse 16, 94315 Straubing, Germany
| | - Thomas Scheibel
- Biomaterials, University of Bayreuth, Universitätsstr. 30, Bayreuth 95440, Germany
| | - Georg Papastavrou
- Physical Chemistry/Physics of Polymers, University of Bayreuth, Universitätsstr. 30, Bayreuth 95440, Germany.
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6
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Zhang R, Zhang Y, Antila HS, Lutkenhaus JL, Sammalkorpi M. Role of Salt and Water in the Plasticization of PDAC/PSS Polyelectrolyte Assemblies. J Phys Chem B 2016; 121:322-333. [DOI: 10.1021/acs.jpcb.6b12315] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Ran Zhang
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
| | - Yanpu Zhang
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Hanne S. Antila
- Department
of Chemistry, School of Chemical Technology, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
| | - Jodie L. Lutkenhaus
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Maria Sammalkorpi
- Department
of Chemistry, School of Chemical Technology, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
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7
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Chen XC, Ren KF, Chen JY, Wang J, Zhang H, Ji J. Self-wrinkling polyelectrolyte multilayers: construction, smoothing and the underlying mechanism. Phys Chem Chem Phys 2016; 18:31168-31174. [DOI: 10.1039/c6cp05419f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The spontaneous formation of these surface features can be attributed to swelling-induced film deformation during the assembling process.
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Affiliation(s)
- Xia-chao Chen
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Ke-feng Ren
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Jia-yan Chen
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Jing Wang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - He Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Jian Ji
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
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Kuznetsov V, Zinn AH, Zampardi G, Borhani-Haghighi S, La Mantia F, Ludwig A, Schuhmann W, Ventosa E. Wet Nanoindentation of the Solid Electrolyte Interphase on Thin Film Si Electrodes. ACS APPLIED MATERIALS & INTERFACES 2015; 7:23554-23563. [PMID: 26418194 DOI: 10.1021/acsami.5b06700] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The solid electrolyte interphase (SEI) film formed at the surface of negative electrodes strongly affects the performance of a Li-ion battery. The mechanical properties of the SEI are of special importance for Si electrodes due to the large volumetric changes of Si upon (de)insertion of Li ions. This manuscript reports the careful determination of the Young's modulus of the SEI formed on a sputtered Si electrode using wet atomic force microscopy (AFM)-nanoindentation. Several key parameters in the determination of the Young's modulus are considered and discussed, e.g., wetness and roughness-thickness ratio of the film and the shape of a nanoindenter. The values of the Young's modulus were determined to be 0.5-10 MPa under the investigated conditions which are in the lower range of those previously reported, i.e., 1 MPa to 10 GPa, pointing out the importance of the conditions of its determination. After multiple electrochemical cycles, the polymeric deposits formed on the surface of the SEI are revealed, by force-volume mapping in liquid using colloidal probes, to extend up to 300 nm into bulk solution.
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Affiliation(s)
- Volodymyr Kuznetsov
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-University Bochum , Universitätsstraße 150, 44780 Bochum, Germany
| | - Arndt-Hendrik Zinn
- Institute for Materials, Ruhr-University Bochum , Universitätsstraße 150, 44801 Bochum, Germany
| | - Giorgia Zampardi
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-University Bochum , Universitätsstraße 150, 44780 Bochum, Germany
- Semiconductor & Energy Conversion - Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , 44780 Bochum, Germany
| | - Sara Borhani-Haghighi
- Institute for Materials, Ruhr-University Bochum , Universitätsstraße 150, 44801 Bochum, Germany
| | - Fabio La Mantia
- Semiconductor & Energy Conversion - Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , 44780 Bochum, Germany
- Energiespeicher- und Energiewandlersysteme, Universität Bremen , Wiener Str. 12, 28359 Bremen, Germany
| | - Alfred Ludwig
- Institute for Materials, Ruhr-University Bochum , Universitätsstraße 150, 44801 Bochum, Germany
- Materials Research Department, Ruhr-Universität Bochum , Universitätsstr.150, 44780 Bochum, Germany
| | - Wolfgang Schuhmann
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-University Bochum , Universitätsstraße 150, 44780 Bochum, Germany
- Materials Research Department, Ruhr-Universität Bochum , Universitätsstr.150, 44780 Bochum, Germany
| | - Edgar Ventosa
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-University Bochum , Universitätsstraße 150, 44780 Bochum, Germany
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Siglreitmeier M, Wu B, Kollmann T, Neubauer M, Nagy G, Schwahn D, Pipich V, Faivre D, Zahn D, Fery A, Cölfen H. Multifunctional layered magnetic composites. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:134-148. [PMID: 25671158 PMCID: PMC4311584 DOI: 10.3762/bjnano.6.13] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 12/09/2014] [Indexed: 05/31/2023]
Abstract
A fabrication method of a multifunctional hybrid material is achieved by using the insoluble organic nacre matrix of the Haliotis laevigata shell infiltrated with gelatin as a confined reaction environment. Inside this organic scaffold magnetite nanoparticles (MNPs) are synthesized. The amount of MNPs can be controlled through the synthesis protocol therefore mineral loadings starting from 15 wt % up to 65 wt % can be realized. The demineralized organic nacre matrix is characterized by small-angle and very-small-angle neutron scattering (SANS and VSANS) showing an unchanged organic matrix structure after demineralization compared to the original mineralized nacre reference. Light microscopy and confocal laser scanning microscopy studies of stained samples show the presence of insoluble proteins at the chitin surface but not between the chitin layers. Successful and homogeneous gelatin infiltration in between the chitin layers can be shown. The hybrid material is characterized by TEM and shows a layered structure filled with MNPs with a size of around 10 nm. Magnetic analysis of the material demonstrates superparamagnetic behavior as characteristic for the particle size. Simulation studies show the potential of collagen and chitin to act as nucleators, where there is a slight preference of chitin over collagen as a nucleator for magnetite. Colloidal-probe AFM measurements demonstrate that introduction of a ferrogel into the chitin matrix leads to a certain increase in the stiffness of the composite material.
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Affiliation(s)
- Maria Siglreitmeier
- Department of Chemistry, Physical Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
| | - Baohu Wu
- Department of Chemistry, Physical Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
- Jülich Centre for Neutron Science JCNS-MLZ, Outstation at MLZ, Forschungszentrum Jülich, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Tina Kollmann
- Theoretical Chemistry, University of Erlangen-Nürnberg, Nägelsbachstraße 25, 91052 Erlangen, Germany
| | - Martin Neubauer
- Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Gergely Nagy
- Laboratory for Neutron Scattering, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Dietmar Schwahn
- Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), 85748 Garching, Germany
| | - Vitaliy Pipich
- Jülich Centre for Neutron Science JCNS-MLZ, Outstation at MLZ, Forschungszentrum Jülich, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Damien Faivre
- Department of Biomaterials, Max Planck Institute of Colloids & Interfaces Science Park Golm, 14424 Potsdam, Germany
| | - Dirk Zahn
- Theoretical Chemistry, University of Erlangen-Nürnberg, Nägelsbachstraße 25, 91052 Erlangen, Germany
| | - Andreas Fery
- Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Helmut Cölfen
- Department of Chemistry, Physical Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
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Kunz DA, Erath J, Kluge D, Thurn H, Putz B, Fery A, Breu J. In-plane modulus of singular 2:1 clay lamellae applying a simple wrinkling technique. ACS APPLIED MATERIALS & INTERFACES 2013; 5:5851-5. [PMID: 23719416 DOI: 10.1021/am4015204] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Knowledge of the mechanical properties of singular clay lamellae is of crucial importance for the optimization of clay-polymer nanocomposites. On the basis of controlled stress release, singular 2:1 clay lamellae show regular wrinkles on a deformable substrate. A subsequent two-dimensional Fourier transformation gives an in-plane modulus of the clay lamella of approximately 150 GPa. Only readily-available topographical atomic force microscopy is required for analysis rendering that fast and facile procedure generally applicable for nanoplatelet characterization.
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Affiliation(s)
- Daniel A Kunz
- Department of Inorganic Chemistry I, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
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