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Li J, Krishna B A, van Ewijk G, van Dijken DJ, de Vos WM, van der Gucht J. A comparison of complexation induced brittleness in PEI/PSS and PEI/NaPSS single-step coatings. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Abeyratne-Perera HK, Basu S, Chandran PL. Shells of compacted DNA as nanocontainers transporting proteins in multiplexed delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 127:112184. [PMID: 34225845 DOI: 10.1016/j.msec.2021.112184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 05/04/2021] [Accepted: 05/07/2021] [Indexed: 11/24/2022]
Abstract
Polyethyleneimine (PEI) polymers are known to compact DNA strands into spheroid, toroid, or rod structures. A formulation with mannose-grafted PEI (PEIm), however, was reported to compact DNA into ~100 nm spheroids that indented like thin-walled pressurized shells. The goal of the study is to understand why mannose bristles divert the traditional pathway of PEI-DNA compaction to produce shell-like structures, and to manipulate the process so that proteins can be packed into the core of the assembling shells for co-delivering DNA and proteins into cells. DLS, AFM, and TEM imaging provide a consistent picture that BSA proteins can be packed into the shells without altering the shell architecture, as long as the proteins were added during the time course of shell assembly. Force spectroscopy studies reveal that DNA shells that buckle also have a rich surface-coating of mannose, indicating that a micelle-like partitioning of hydrophobic and hydrophilic layers governs shell assembly. When HEK293T cells are spiked with BSA-laden DNA shells, co-transfection of DNA and BSA is observed at higher levels than control formulations. Distinct micron-sized features appear having both green fluorescence from BSA-FITC and blue fluorescence from NucBlue DNA stain, suggesting BSA release in nucleus and secretory granules. With DNA nanocontainers, proteins can take advantage of the efficiency of PEI-based DNA transfection for hitchhiking into cells while being shielded from the challenges of the intracellular route. DNA nanocontainers are rapid to assemble, not dependent on the DNA sequence, and can be adapted for different protein types; thereby having potential to serve as a high-throughput platform in scenarios where DNA and protein have to be released at the same site and time within cells (e.g., theranostics, multiplexed co-delivery, gene editing).
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Affiliation(s)
- Hashanthi K Abeyratne-Perera
- Biochemistry and Molecular Biology Department, College of Medicine, Howard University, Washington, DC, United States of America
| | - Saswati Basu
- Chemical Engineering Department, College of Engineering and Architecture, Howard University, Washington, DC, United States of America
| | - Preethi L Chandran
- Biochemistry and Molecular Biology Department, College of Medicine, Howard University, Washington, DC, United States of America; Chemical Engineering Department, College of Engineering and Architecture, Howard University, Washington, DC, United States of America.
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3
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Puri S, Thaokar RM. Study of dependence of elasticity on the microstructure of microcapsules using electro-deformation technique. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.02.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Czerwieniec B, Strawski M, Granicka LH, Szklarczyk M. AFM study of adhesion and interactions between polyelectrolyte bilayers assembly. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Hellwig J, Strebe J, V Klitzing R. Effect of environmental parameters on the nano mechanical properties of hyaluronic acid/poly(l-lysine) multilayers. Phys Chem Chem Phys 2018; 20:19082-19086. [PMID: 29972161 DOI: 10.1039/c8cp02621a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Atomic force microscopy (AFM) was used to determine the mechanical properties as the indentation modulus of native and crosslinked poly(l-lysine) (PLL)/hyaluronic acid (HA) multilayer films by static force measurements. The influence of the surrounding medium on the mechanical properties of the films after preparation is investigated. The indentation modulus of native and crosslinked film was measured at different pH values, ionic strengths and temperatures. The native HA/PLL films, which behave like a physical gel, show the highest values of the indentation modulus for an intermediate pH value and low ionic strength. Any changes in the pH or an increase in the ionic strength/temperature decreases the measured indentation modulus. In contrast, the crosslinked films show an increase by a factor of 80 in the indentation modulus but no response to changes in the pH, ionic strength or temperature; they behave like a chemical gel. The pH, ionic strength and temperature used in this work are close to the in vivo conditions and thus give a fundamental point of view on the nanomechanical response of the PLL/HA films. Furthermore, information about the mechanical properties can be used for the understanding and manipulation of cell adhesion.
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Affiliation(s)
- Johannes Hellwig
- Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17. Juni 124, D-10623, Berlin, Germany
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6
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Mettu S, Ye Q, Zhou M, Dagastine R, Ashokkumar M. Ultrasonically synthesized organic liquid-filled chitosan microcapsules: part 2: characterization using AFM (atomic force microscopy) and combined AFM-confocal laser scanning fluorescence microscopy. SOFT MATTER 2018; 14:3192-3201. [PMID: 29651482 DOI: 10.1039/c8sm00065d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Atomic Force Microscopy (AFM) is used to measure the stiffness and Young's modulus of individual microcapsules that have a chitosan cross-linked shell encapsulating tetradecane. The oil filled microcapsules were prepared using a one pot synthesis via ultrasonic emulsification of tetradecane and crosslinking of the chitosan shell in aqueous solutions of acetic acid. The concentration of acetic acid in aqueous solutions of chitosan was varied from 0.2% to 25% v/v. The effect of acetic acid concentration and size of the individual microcapsules on the strength was probed. The deformations and forces required to rupture the microcapsules were also measured. Three dimensional deformations of microcapsules under large applied loads were obtained by the combination of Laser Scanning Confocal Microscopy (LSCM) with Atomic Force Microscopy (AFM). The stiffness, and hence the modulus, of the microcapsules was found to decrease with an increase in size with the average stiffness ranging from 82 to 111 mN m-1 and average Young's modulus ranging from 0.4 to 6.5 MPa. The forces required to rupture the microcapsules varied from 150 to 250 nN with deformations of the microcapsules up to 62 to 110% relative to their radius, respectively. Three dimensional images obtained using laser scanning confocal microscopy showed that the microcapsules retained their structure and shape after being subjected to large deformations and subsequent removal of the loads. Based on the above observations, the oil filled chitosan crosslinked microcapsules are an ideal choice for use in the food and pharmaceutical industries as they would be able to withstand the process conditions encountered.
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Affiliation(s)
- Srinivas Mettu
- School of Chemistry, The University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia.
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7
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Tailored polyelectrolyte thin film multilayers to modulate cell adhesion. Biointerphases 2017; 12:04E403. [DOI: 10.1116/1.5000588] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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8
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Hellwig J, Micciulla S, Strebe J, von Klitzing R. Separation of Storage and Loss Modulus of Polyelectrolyte Multilayers on a Nanoscale: A Dynamic AFM Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10505-10512. [PMID: 27610635 DOI: 10.1021/acs.langmuir.6b02764] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Atomic force microscopy (AFM) is used to carry out rheology measurements on the nanoscale and to determine the mechanical properties of poly(l-lysine) (PLL)/hyaluronic acid (HA) multilayer films. Storage (G') and loss modulus (G″) of the films are calculated and compared with the values obtained from quartz crystal microbalance with dissipation monitoring measurements (QCM-D). A predominant elastic behavior independently of the applied frequencies (5-100 Hz) is observed for native HA/PLL films consisting of 36 double layer. If the layers are cross-linked, the value of G' increases by 2 orders of magnitude, while the loss modulus becomes negligible, making these films a purely elastic chemical gel. The values of G' and G'' extracted from QCM-D measurements on native films are much higher, due to the different frequency regime of the applied shear stress. However, the viscoelastic ratio from the two methods is the same and proves the elastic dominated response of the multilayer in both frequency regimes.
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Affiliation(s)
- Johannes Hellwig
- Stranski-Laboratorium, Department of Chemistry, TU Berlin , Strasse des 17. Juni 124, D-10623 Berlin, Germany
| | - Samantha Micciulla
- Stranski-Laboratorium, Department of Chemistry, TU Berlin , Strasse des 17. Juni 124, D-10623 Berlin, Germany
| | - Julia Strebe
- Stranski-Laboratorium, Department of Chemistry, TU Berlin , Strasse des 17. Juni 124, D-10623 Berlin, Germany
| | - Regine von Klitzing
- Stranski-Laboratorium, Department of Chemistry, TU Berlin , Strasse des 17. Juni 124, D-10623 Berlin, Germany
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9
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Mettu S, Zhou M, Tardy BL, Ashokkumar M, Dagastine RR. Temperature dependent mechanical properties of air, oil and water filled microcapsules studied by atomic force microscopy. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.02.046] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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10
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Zahouani S, Chaumont A, Senger B, Boulmedais F, Schaaf P, Jierry L, Lavalle P. Stretch-Induced Helical Conformations in Poly(l-lysine)/Hyaluronic Acid Multilayers. ACS APPLIED MATERIALS & INTERFACES 2016; 8:14958-14965. [PMID: 26646202 DOI: 10.1021/acsami.5b08302] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We investigate the effect of stretching on the secondary structure of cross-linked poly(l-lysine)/hyaluronic acid (PLL/HA) multilayers. We show that stretching these films induces changes in the secondary structure of PLL chains. Our results suggest that not only α- but also 310-helices might form in the film under stretching. Such 310-helices have never been observed for PLL so far. These changes of the secondary structure of PLL are reversible, i.e., when returning to the nonstretched state one recovers the initial film structure. Using molecular dynamics simulations of chains composed of 20 l-lysine residues (PLL20), we find that these chains never adopt a helical conformation in water. In contrast, when the end-to-end distance of the chains is restrained to values smaller than the mean end-to-end distance of free chains, a distance domain rarely explored by the free chains, helical conformations become accessible. Moreover, the formation of not only α- but also 310-helices is predicted by the simulations. These results suggest that the change of the end-to-end distance of PLL chains in the stretched film is at the origin of the helix formation.
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Affiliation(s)
- Sarah Zahouani
- Institut National de la Santé et de la Recherche Médicale, INSERM Unité 1121 , 11 rue Humann, 67085 Strasbourg Cedex, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg , 8 rue Sainte Elisabeth, 67000 Strasbourg, France
| | - Alain Chaumont
- Faculté de Chimie, UMR 7177, Université de Strasbourg , 1 rue Blaise Pascal, 67008 Strasbourg Cedex, France
| | - Bernard Senger
- Institut National de la Santé et de la Recherche Médicale, INSERM Unité 1121 , 11 rue Humann, 67085 Strasbourg Cedex, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg , 8 rue Sainte Elisabeth, 67000 Strasbourg, France
| | - Fouzia Boulmedais
- Institut Charles Sadron, CNRS UPR 22 , 23 rue du Lœss, 67034 Strasbourg Cedex, France
- University of Strasbourg Institute of Advanced Study , 5 allée du Général Rouvillois, 67083 Strasbourg Cedex, France
| | - Pierre Schaaf
- Institut National de la Santé et de la Recherche Médicale, INSERM Unité 1121 , 11 rue Humann, 67085 Strasbourg Cedex, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg , 8 rue Sainte Elisabeth, 67000 Strasbourg, France
- Institut Charles Sadron, CNRS UPR 22 , 23 rue du Lœss, 67034 Strasbourg Cedex, France
- University of Strasbourg Institute of Advanced Study , 5 allée du Général Rouvillois, 67083 Strasbourg Cedex, France
| | - Loïc Jierry
- Institut Charles Sadron, CNRS UPR 22 , 23 rue du Lœss, 67034 Strasbourg Cedex, France
- University of Strasbourg Institute of Advanced Study , 5 allée du Général Rouvillois, 67083 Strasbourg Cedex, France
| | - Philippe Lavalle
- Institut National de la Santé et de la Recherche Médicale, INSERM Unité 1121 , 11 rue Humann, 67085 Strasbourg Cedex, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg , 8 rue Sainte Elisabeth, 67000 Strasbourg, France
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11
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Knopf-Marques H, Singh S, Htwe SS, Wolfova L, Buffa R, Bacharouche J, Francius G, Voegel JC, Schaaf P, Ghaemmaghami AM, Vrana NE, Lavalle P. Immunomodulation with Self-Crosslinked Polyelectrolyte Multilayer-Based Coatings. Biomacromolecules 2016; 17:2189-98. [DOI: 10.1021/acs.biomac.6b00429] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Helena Knopf-Marques
- INSERM UMR 1121, 11 rue Humann, 67085 Strasbourg, France
- Faculté
de Chirurgie Dentaire, Fédération de Médecine
Translationnelle de Strabourg, Fédération des Matériaux
et Nanosciences d’Alsace, Université de Strasbourg, 3 rue
Sainte Elisabeth, 67000 Strasbourg, France
| | - Sonali Singh
- Division
of Immunology, School of Life Sciences, Faculty of Medicine and Life
Sciences, University of Nottingham, Queen’s Medics, al Centre, Nottingham, NG7 2UH, United Kingdom
| | - Su Su Htwe
- Division
of Immunology, School of Life Sciences, Faculty of Medicine and Life
Sciences, University of Nottingham, Queen’s Medics, al Centre, Nottingham, NG7 2UH, United Kingdom
| | - Lucie Wolfova
- Contipro
a.s.,
Dolni Dobrouc 401 561 02 Dolni Dobrouc, Czech Republic
| | - Radovan Buffa
- Contipro
a.s.,
Dolni Dobrouc 401 561 02 Dolni Dobrouc, Czech Republic
| | - Jalal Bacharouche
- Laboratoire de Chimie Physique et Microbiologie pour l’Environnement CNRS UMR7564, 405 rue de Vandoeuvre, 54600 Villers-les-Nancy, France
| | - Grégory Francius
- Laboratoire de Chimie Physique et Microbiologie pour l’Environnement CNRS UMR7564, 405 rue de Vandoeuvre, 54600 Villers-les-Nancy, France
| | - Jean-Claude Voegel
- INSERM UMR 1121, 11 rue Humann, 67085 Strasbourg, France
- Faculté
de Chirurgie Dentaire, Fédération de Médecine
Translationnelle de Strabourg, Fédération des Matériaux
et Nanosciences d’Alsace, Université de Strasbourg, 3 rue
Sainte Elisabeth, 67000 Strasbourg, France
| | - Pierre Schaaf
- INSERM UMR 1121, 11 rue Humann, 67085 Strasbourg, France
- Faculté
de Chirurgie Dentaire, Fédération de Médecine
Translationnelle de Strabourg, Fédération des Matériaux
et Nanosciences d’Alsace, Université de Strasbourg, 3 rue
Sainte Elisabeth, 67000 Strasbourg, France
- Institut Charles Sadron, CNRS UPR 22, 23 rue du Lœss, 67034 Strasbourg, France
| | - Amir M. Ghaemmaghami
- Division
of Immunology, School of Life Sciences, Faculty of Medicine and Life
Sciences, University of Nottingham, Queen’s Medics, al Centre, Nottingham, NG7 2UH, United Kingdom
| | - Nihal Engin Vrana
- INSERM UMR 1121, 11 rue Humann, 67085 Strasbourg, France
- Protip Medical, 8 Place de l’Hôpital, 67000 Strasbourg, France
| | - Philippe Lavalle
- INSERM UMR 1121, 11 rue Humann, 67085 Strasbourg, France
- Faculté
de Chirurgie Dentaire, Fédération de Médecine
Translationnelle de Strabourg, Fédération des Matériaux
et Nanosciences d’Alsace, Université de Strasbourg, 3 rue
Sainte Elisabeth, 67000 Strasbourg, France
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12
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Sousa MP, Cleymand F, Mano JF. Elastic chitosan/chondroitin sulfate multilayer membranes. ACTA ACUST UNITED AC 2016; 11:035008. [PMID: 27200488 DOI: 10.1088/1748-6041/11/3/035008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Freestanding multilayered films were obtained using layer-by-layer (LbL) technology from the assembly of natural polyelectrolytes, namely chitosan (CHT) and chondroitin sulfate (CS). The morphology and the transparency of the membranes were evaluated. The influence of genipin (1 and 2 mg ml(-1)), a naturally-derived crosslinker agent, was also investigated in the control of the mechanical properties of the CHT/CS membranes. The water uptake ability can be tailored by changing the crosslinker concentration that also controls the Young's modulus and ultimate tensile strength. The maximum extension tends to decrease upon crosslinking with the highest genipin concentration, compromising the elastic properties of CHT/CS membranes: nevertheless, when using a lower genipin concentration, the ultimate tensile stress is similar to the non-crosslinked one, but exhibits a significantly higher modulus. Moreover, the crosslinked multilayer membranes exhibited shape memory properties, through a simple hydration action. The in vitro biological assays showed better L929 cell adhesion and proliferation when using the crosslinked membranes and confirmed the non-cytotoxicity of the developed CHT/CS membranes. Within this research work, we were able to construct freestanding biomimetic multilayer structures with tailored swelling, mechanical and biological properties that could find applicability in a variety of biomedical applications.
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Affiliation(s)
- M P Sousa
- 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal. ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal. Present address: Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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Wijeratne S, Liu W, Dong J, Ning W, Ratnayake ND, Walker KD, Bruening ML. Layer-by-Layer Deposition with Polymers Containing Nitrilotriacetate, A Convenient Route to Fabricate Metal- and Protein-Binding Films. ACS APPLIED MATERIALS & INTERFACES 2016; 8:10164-10173. [PMID: 27042860 DOI: 10.1021/acsami.6b00896] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This paper describes a convenient synthesis of nitrilotriacetate (NTA)-containing polymers and subsequent layer-by-layer adsorption of these polymers on flat surfaces and in membrane pores. The resulting films form NTA-metal-ion complexes and capture 2-3 mmol of metal ions per mL of film. Moreover, these coatings bind multilayers of polyhistidine-tagged proteins through association with NTA-metal-ion complexes. Inclusion of acrylic acid repeat units in NTA-containing copolymers promotes swelling to increase protein binding in films on Au-coated wafers. Adsorption of NTA-containing films in porous nylon membranes gives materials that capture ∼46 mg of His-tagged ubiquitin per mL. However, the binding capacity decreases with the protein molecular weight. Due to the high affinity of NTA for metal ions, the modified membranes show modest leaching of Ni(2+) in binding and rinsing buffers. Adsorption of NTA-containing polymers is a simple method to create metal- and protein-binding films and may, with future enhancement of stability, facilitate development of disposable membranes that rapidly purify tagged proteins.
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Affiliation(s)
- Salinda Wijeratne
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Weijing Liu
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Jinlan Dong
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Wenjing Ning
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | | | - Kevin D Walker
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Merlin L Bruening
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
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14
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Muzzio NE, Pasquale MA, Gregurec D, Diamanti E, Kosutic M, Azzaroni O, Moya SE. Polyelectrolytes Multilayers to Modulate Cell Adhesion: A Study of the Influence of Film Composition and Polyelectrolyte Interdigitation on the Adhesion of the A549 Cell Line. Macromol Biosci 2015; 16:482-95. [DOI: 10.1002/mabi.201500275] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 10/09/2015] [Indexed: 01/12/2023]
Affiliation(s)
- Nicolás E. Muzzio
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); (UNLP, CONICET); Sucursal 4; Casilla de Correo 16; 1900 La Plata Argentina
| | - Miguel A. Pasquale
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); (UNLP, CONICET); Sucursal 4; Casilla de Correo 16; 1900 La Plata Argentina
| | - Danijela Gregurec
- Soft Matter Nanotechnology Group; CIC biomaGUNE; Paseo Marimón 182 C; 20009 San Sebastián Gipuzkoa Spain
| | - Eleftheria Diamanti
- Soft Matter Nanotechnology Group; CIC biomaGUNE; Paseo Marimón 182 C; 20009 San Sebastián Gipuzkoa Spain
| | - Marija Kosutic
- Soft Matter Nanotechnology Group; CIC biomaGUNE; Paseo Marimón 182 C; 20009 San Sebastián Gipuzkoa Spain
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); (UNLP, CONICET); Sucursal 4; Casilla de Correo 16; 1900 La Plata Argentina
| | - Sergio E. Moya
- Soft Matter Nanotechnology Group; CIC biomaGUNE; Paseo Marimón 182 C; 20009 San Sebastián Gipuzkoa Spain
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15
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Miranda A, Martins M, De Beule PAA. Simultaneous differential spinning disk fluorescence optical sectioning microscopy and nanomechanical mapping atomic force microscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:093705. [PMID: 26429446 DOI: 10.1063/1.4931064] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Combined microscopy techniques offer the life science research community a powerful tool to investigate complex biological systems and their interactions. Here, we present a new combined microscopy platform based on fluorescence optical sectioning microscopy through aperture correlation microscopy with a Differential Spinning Disk (DSD) and nanomechanical mapping with an Atomic Force Microscope (AFM). The illumination scheme of the DSD microscope unit, contrary to standard single or multi-point confocal microscopes, provides a time-independent illumination of the AFM cantilever. This enables a distortion-free simultaneous operation of fluorescence optical sectioning microscopy and atomic force microscopy with standard probes. In this context, we discuss sample heating due to AFM cantilever illumination with fluorescence excitation light. Integration of a DSD fluorescence optical sectioning unit with an AFM platform requires mitigation of mechanical noise transfer of the spinning disk. We identify and present two solutions to almost annul this noise in the AFM measurement process. The new combined microscopy platform is applied to the characterization of a DOPC/DOPS (4:1) lipid structures labelled with a lipophilic cationic indocarbocyanine dye deposited on a mica substrate.
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Affiliation(s)
- Adelaide Miranda
- Applied Nano-Optics Laboratory, International Iberian Nanotechnology Laboratory, Avenida Mestre José Veiga, s/n, 4715-330 Braga, Portugal
| | - Marco Martins
- Nano-ICs Group, International Iberian Nanotechnology Laboratory, Avenida Mestre José Veiga, s/n, 4715-330 Braga, Portugal
| | - Pieter A A De Beule
- Applied Nano-Optics Laboratory, International Iberian Nanotechnology Laboratory, Avenida Mestre José Veiga, s/n, 4715-330 Braga, Portugal
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Chyasnavichyus M, Young SL, Tsukruk VV. Mapping micromechanical properties of soft polymer contact lenses. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.09.053] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Reisch A, Roger E, Phoeung T, Antheaume C, Orthlieb C, Boulmedais F, Lavalle P, Schlenoff JB, Frisch B, Schaaf P. On the benefits of rubbing salt in the cut: self-healing of saloplastic PAA/PAH compact polyelectrolyte complexes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:2547-51. [PMID: 24478263 DOI: 10.1002/adma.201304991] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 11/22/2013] [Indexed: 05/04/2023]
Abstract
The inherent room temperature mending and self-healing properties of saloplastic PAA/PAH CoPECs are studied. After ultracentrifugation of PAA/PAH polyelectrolyte complexes, tough, elastic materials are obtained that undergo self-healing facilitated by salt. At intermediate salt concentrations the CoPECs remain elastic enough to recover their original shape while the chains are mobile enough to repair the cut, thus leading to actual self-healing behavior.
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Affiliation(s)
- Andreas Reisch
- Laboratoire de Conception et Application de Molécules Bioactives, UMR 7199, CNRS/Université de Strasbourg Faculté de Pharmacie, 74 Route du Rhin, 67401, Illkirch Cedex, France; International Center for Frontier Research in Chemistry, 8 Allée Gaspard Monge, 67083, Strasbourg, France
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Joseph N, Ahmadiannamini P, Hoogenboom R, Vankelecom IFJ. Layer-by-layer preparation of polyelectrolyte multilayer membranes for separation. Polym Chem 2014. [DOI: 10.1039/c3py01262j] [Citation(s) in RCA: 243] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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19
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Parveen N, Schönhoff M. Swelling and Stability of Polyelectrolyte Multilayers in Ionic Liquid Solutions. Macromolecules 2013. [DOI: 10.1021/ma401625r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Nagma Parveen
- Institute
of Physical Chemistry, University of Muenster, Corrensstr. 28/30, 48149 Münster, Germany
- NRW
Graduate School of Chemistry, University of Muenster, Wilhelm-Klemm-Str.
10, D-48149 Münster, Germany
| | - Monika Schönhoff
- Institute
of Physical Chemistry, University of Muenster, Corrensstr. 28/30, 48149 Münster, Germany
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20
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21
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Varughese S, Kiran MSRN, Ramamurty U, Desiraju GR. Nanoindentation im Kristall-Engineering: Quantifizierung mechanischer Eigenschaften von Molekülkristallen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201205002] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Varughese S, Kiran MSRN, Ramamurty U, Desiraju GR. Nanoindentation in crystal engineering: quantifying mechanical properties of molecular crystals. Angew Chem Int Ed Engl 2013; 52:2701-12. [PMID: 23315913 DOI: 10.1002/anie.201205002] [Citation(s) in RCA: 178] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Revised: 08/31/2012] [Indexed: 11/05/2022]
Abstract
Nanoindentation is a technique for measuring the elastic modulus and hardness of small amounts of materials. This method, which has been used extensively for characterizing metallic and inorganic solids, is now being applied to organic and metal-organic crystals, and has also become relevant to the subject of crystal engineering, which is concerned with the design of molecular solids with desired properties and functions. Through nanoindentation it is possible to correlate molecular-level properties such as crystal packing, interaction characteristics, and the inherent anisotropy with micro/macroscopic events such as desolvation, domain coexistence, layer migration, polymorphism, and solid-state reactivity. Recent developments and exciting opportunities in this area are highlighted in this Minireview.
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Affiliation(s)
- Sunil Varughese
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
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23
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Gensel J, Dewald I, Erath J, Betthausen E, Müller AHE, Fery A. Reversible swelling transitions in stimuli-responsive layer-by-layer films containing block copolymer micelles. Chem Sci 2013. [DOI: 10.1039/c2sc20836a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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24
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Cavelier S, Barrett CJ, Barthelat F. The Mechanical Performance of a Biomimetic Nanointerface Made of Multilayered Polyelectrolytes. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200626] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Lehaf AM, Hariri HH, Schlenoff JB. Homogeneity, modulus, and viscoelasticity of polyelectrolyte multilayers by nanoindentation: refining the buildup mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6348-55. [PMID: 22480307 PMCID: PMC3328862 DOI: 10.1021/la300482x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Atomic force microscopy, AFM, and nanoindentation of polyelectrolyte multilayers, PEMUs, made from poly(diallyldimethylammonium), PDADMA, and poly(styrene sulfonate), PSS, provided new insight into their surface morphology and growth mechanism. A strong odd/even alternation of surface modulus revealed greater extrinsic (counterion-balanced) charge compensation for fully hydrated multilayers ending in the polycation, PDADMA. These swings in modulus indicate a much more asymmetric layer-by-layer growth mechanism than previously proposed. Viscoelastic properties of the PEMU, which may contribute to cell response, were highlighted by variable indentation rates and minimized by extrapolating to zero indentation rate, at which point the surface and bulk equilibrium moduli were comparable. Variations in surface composition were probed at high resolution using force mapping, and the surface was found to be uniform, with no evidence of phase separation. AFM comparison of wet and dry films terminated with PSS and PDADMA revealed much greater swelling of the PDADMA-terminated PEMU by water, with collapse of surface roughness features in dry conditions. Dynamic and static contact angle measurements suggested less rearrangement for the glassy PSS surface.
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Affiliation(s)
- Ali M Lehaf
- Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, Florida 32306, USA
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26
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Gribova V, Auzely-Velty R, Picart C. Polyelectrolyte Multilayer Assemblies on Materials Surfaces: From Cell Adhesion to Tissue Engineering. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2012; 24:854-869. [PMID: 25076811 PMCID: PMC4112380 DOI: 10.1021/cm2032459] [Citation(s) in RCA: 231] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Controlling the bulk and surface properties of materials is a real challenge for bioengineers working in the fields of biomaterials, tissue engineering and biophysics. The layer-by-layer (LbL) deposition method, introduced 20 years ago, consists in the alternate adsorption of polyelectrolytes that self-organize on the material's surface, leading to the formation of polyelectrolyte multilayer (PEM) films.1 Because of its simplicity and versatility, the procedure has led to considerable developments of biological applications within the past 5 years. In this review, we focus our attention on the design of PEM films as surface coatings for applications in the field of physical properties that have emerged as being key points in relation to biological processes. The numerous possibilities for adjusting the chemical, physical, and mechanical properties of PEM films have fostered studies on the influence of these parameters on cellular behaviors. Importantly, PEM have emerged as a powerful tool for the immobilization of biomolecules with preserved bioactivity.
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Affiliation(s)
- Varvara Gribova
- LMGP-MINATEC, Grenoble Institute of Technology, 3 Parvis Louis Néel, 38016 Grenoble, France
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), affiliated with University Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble, France
| | - Rachel Auzely-Velty
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), affiliated with University Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble, France
| | - Catherine Picart
- LMGP-MINATEC, Grenoble Institute of Technology, 3 Parvis Louis Néel, 38016 Grenoble, France
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27
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Üzüm C, Hellwig J, Madaboosi N, Volodkin D, von Klitzing R. Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2012; 3:778-88. [PMID: 23213641 PMCID: PMC3512127 DOI: 10.3762/bjnano.3.87] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 10/21/2012] [Indexed: 05/19/2023]
Abstract
Scanning- and colloidal-probe atomic force microscopy were used to study the mechanical properties of poly(L-lysine)/hyaluronan (PLL/HA)(n) films as a function of indentation velocity and the number of polymer deposition steps n. The film thickness was determined by two independent AFM-based methods: scratch-and-scan and newly developed full-indentation. The advantages and disadvantages of both methods are highlighted, and error minimization techniques in elasticity measurements are addressed. It was found that the film thickness increases linearly with the bilayer number n, ranging between 400 and 7500 nm for n = 12 and 96, respectively. The apparent Young's modulus E ranges between 15 and 40 kPa and does not depend on the indenter size or the film bilayer number n. Stress relaxation measurements show that PLL/HA films have a viscoelastic behaviour, regardless of their thickness. If indentation is performed several times at the same lateral position on the film, a viscous/plastic deformation takes place.
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Affiliation(s)
- Cagri Üzüm
- Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany
| | - Johannes Hellwig
- Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany
| | - Narayanan Madaboosi
- Fraunhofer Institute for Biomedical Engineering, Am Mühlenberg 13, 14476 Potsdam-Golm, Germany
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Dmitry Volodkin
- Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Regine von Klitzing
- Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany
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28
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Lehaf AM, Moussallem MD, Schlenoff JB. Correlating the compliance and permeability of photo-cross-linked polyelectrolyte multilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4756-4763. [PMID: 21443175 PMCID: PMC3075366 DOI: 10.1021/la200229h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Photo-cross-linkable polyelectrolyte multilayers were made from poly(allylamine) (PAH) and poly(acrylic acid) (PAA) modified with a photosensitive benzophenone. Nanoindentation, using atomic force microscopy (AFM) of these and unmodified PAH/PAA multilayers, was used to assess their mechanical properties in situ under an aqueous buffer. Under the conditions employed (and a 20 nm radius AFM tip), reliable nanoindentations that appeared to be decoupled from the properties of the silicon substrate were obtained for films greater than 150 nm in thickness. A strong difference in the apparent modulus was observed for films terminated with positive as compared to negative polyelectrolytes. Films terminated with PAA were more glassy, suggesting better charge matching of polyelectrolytes. Multilayers irradiated for up to 100 min showed a smooth, controlled increase in the modulus with little change in the water contact angle. The permeability to iodide ion, measured electrochemically, also decreased in a controlled fashion.
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Affiliation(s)
- Ali M Lehaf
- Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, Florida 32306, USA
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29
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Ott P, Trenkenschuh K, Gensel J, Fery A, Laschewsky A. Free-standing membranes via covalent cross-linking of polyelectrolyte multilayers with complementary reactivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:18182-18188. [PMID: 21033763 DOI: 10.1021/la1035882] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Polyelectrolyte multilayers were prepared by the layer-by-layer (LbL) technique from polyanions bearing aldehyde and polycations with 4-methylpyridinium moieties. The aldol reaction of these complementary reactive groups can be followed by the formation of fluorescent merocyanine dyes, resulting in cross-linked, ultrathin polymer films. The efficient stabilization of the polymer films allows for their intact removal from high surface energy supports, such as glass or surface oxidized silicon wafers, by simple treatment with salt solutions, yielding free-standing membranes. Increasing separation of the reactive polycation and polyanion layers with layers of inert polycation and polyanion analogues only gradually prevents the coupling reaction. From this dependence, polyions assembled in consecutive adsorption layers seem to be able to penetrate into as far as three neighboring layers.
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Affiliation(s)
- Patrick Ott
- Department of Chemistry, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany
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30
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Crouzier T, Boudou T, Picart C. Polysaccharide-based polyelectrolyte multilayers. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.05.007] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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31
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Feldötö Z, Varga I, Blomberg E. Influence of salt and rinsing protocol on the structure of PAH/PSS polyelectrolyte multilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17048-17057. [PMID: 20886835 DOI: 10.1021/la102351f] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A quartz crystal microbalance (QCM) and dual polarization interferometry (DPI) have been utilized to study how the structure of poly(allylamine hydrochloride) (PAH)/poly(styrene sulfonate) (PSS) multilayers is affected by the rinsing method (i.e., the termination of polyelectrolyte adsorption). The effect of the type of counterions used in the deposition solution was also investigated, and the polyelectrolyte multilayers were formed in a 0.5 M electrolyte solution (NaCl and KBr). From the measurements, it was observed that thicker layers were obtained when using KBr in the deposition solution than when using NaCl. Three different rinsing protocols have been studied: (i) the same electrolyte solution as used during multilayer formation, (ii) pure water, and (iii) first a salt solution (0.5 M) and then pure water. When the multilayer with PAH as the outermost layer was exposed to pure water, an interesting phenomenon was discovered: a large change in the energy dissipation was measured with the QCM. This could be attributed to the swelling of the layer, and from both QCM and DPI it is obvious that only the outermost PAH layer swells (to a thickness of 25-30 nm) because of a decrease in ionic strength and hence an increase in intra- and interchain repulsion, whereas the underlying layers retain a very rigid and compact structure with a low water content. Interestingly, the outermost PAH layer seems to obtain very similar thicknesses in water independent of the electrolyte used for the multilayer buildup. Another interesting aspect was that the measured thickness with the DPI evaluated by a single-layer model did not correlate with the estimated thickness from the model calculations performed on the QCM-D data. Thus, we applied a two-layer model to evaluate the DPI data and the results were in excellent agreement with the QCM-D results. To our knowledge, this evaluation of DPI data has not been done previously.
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Affiliation(s)
- Zsombor Feldötö
- Surface & Corrosion Science, Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
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Hariri HH, Schlenoff JB. Saloplastic Macroporous Polyelectrolyte Complexes: Cartilage Mimics. Macromolecules 2010; 43:8656-8663. [PMID: 21132107 PMCID: PMC2994323 DOI: 10.1021/ma1012978] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 08/31/2010] [Indexed: 11/29/2022]
Abstract
Complexes of sodium poly(4-styrenesulfonate) (NaPSS) and poly(diallyldimethylammonium chloride) (PDADMAC) were formed on mixing equimolar solutions in high salt concentration. Under ultracentrifugal fields, the complex precipitates were transformed into compact polyelectrolyte complexes (CoPECs), which showed extensive porosity. The mechanical properties of CoPECS make them attractive for bioimplants and tissue engineering applications. Free NaPSS chains in the closed pores of CoPECs create excess osmotic pressure, which controls the pore size and contributes to the mechanical resistance of the material. The mechanical properties of CoPECs, modulated by the ionic strength of the doping medium, were studied by uniaxial tensile testing and the stress-strain data were fit to a three-element Maxwell model which revealed at least two regimes of stress relaxation.
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Affiliation(s)
- Haifa H. Hariri
- Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, Florida 32306
| | - Joseph B. Schlenoff
- Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, Florida 32306
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33
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Aulin C, Johansson E, Wågberg L, Lindström T. Self-organized films from cellulose I Nanofibrils using the layer-by-layer technique. Biomacromolecules 2010; 11:872-82. [PMID: 20196583 DOI: 10.1021/bm100075e] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The possibility of forming self-organized films using only charge-stabilized dispersions of cellulose I nanofibrils with opposite charges is presented, that is, the multilayers were composed solely of anionically and cationically modified microfibrillated cellulose (MFC) with a low degree of substitution. The build-up behavior and the properties of the layer-by-layer (LbL)-constructed films were studied using a quartz crystal microbalance with dissipation (QCM-D) and stagnation point adsorption reflectometry (SPAR). The adsorption behavior of cationic/anionic MFC was compared with that of polyethyleneimine (PEI)/anionic MFC. The water contents of five bilayers of cationic/anionic MFC and PEI/anionic MFC were approximately 70 and 50%, respectively. The MFC surface coverage was studied by atomic force microscopy (AFM) measurements, which clearly showed a more dense fibrillar structure in the five bilayer PEI/anionic MFC than in the five bilayer cationic/anionic MFC. The forces between the cellulose-based multilayers were examined using the AFM colloidal probe technique. The forces on approach were characterized by a combination of electrostatic and steric repulsion. The wet adhesive forces were very long-range and were characterized by multiple adhesive events. Surfaces covered by PEI/anionic MFC multilayers required more energy to be separated than surfaces covered by cationic/anionic MFC multilayers.
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Affiliation(s)
- Christian Aulin
- BIM Kemi AB, Box 3102, SE-443 03 Stenkullen, Sweden, Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Innventia AB, Box 5604, SE-114 86 Stockholm, Sweden.
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Akgöl Y, Cramer C, Hofmann C, Karatas Y, Wiemhöfer HD, Schönhoff M. Humidity-Dependent DC Conductivity of Polyelectrolyte Multilayers: Protons or Other Small Ions as Charge Carriers? Macromolecules 2010. [DOI: 10.1021/ma1012489] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yahya Akgöl
- Institut für Physikalische Chemie and SFB 458, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48149 Münster, Germany
| | - Cornelia Cramer
- Institut für Physikalische Chemie and SFB 458, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48149 Münster, Germany
| | - Christian Hofmann
- Institut für Physikalische Chemie and SFB 458, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48149 Münster, Germany
| | - Yunus Karatas
- Institut für Anorganische und Analytische Chemie and SFB 458, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, 48149 Münster, Germany
| | - Hans-Dieter Wiemhöfer
- Institut für Anorganische und Analytische Chemie and SFB 458, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, 48149 Münster, Germany
| | - Monika Schönhoff
- Institut für Physikalische Chemie and SFB 458, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48149 Münster, Germany
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Kocgozlu L, Lavalle P, Koenig G, Senger B, Haikel Y, Schaaf P, Voegel JC, Tenenbaum H, Vautier D. Selective and uncoupled role of substrate elasticity in the regulation of replication and transcription in epithelial cells. J Cell Sci 2010; 123:29-39. [PMID: 20016064 DOI: 10.1242/jcs.053520] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Actin cytoskeleton forms a physical connection between the extracellular matrix, adhesion complexes and nuclear architecture. Because tissue stiffness plays key roles in adhesion and cytoskeletal organization, an important open question concerns the influence of substrate elasticity on replication and transcription. To answer this major question, polyelectrolyte multilayer films were used as substrate models with apparent elastic moduli ranging from 0 to 500 kPa. The sequential relationship between Rac1, vinculin adhesion assembly, and replication becomes efficient at above 200 kPa because activation of Rac1 leads to vinculin assembly, actin fiber formation and, subsequently, to initiation of replication. An optimal window of elasticity (200 kPa) is required for activation of focal adhesion kinase through auto-phosphorylation of tyrosine 397. Transcription, including nuclear recruitment of heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1), occurred above 50 kPa. Actin fiber and focal adhesion signaling are not required for transcription. Above 50 kPa, transcription was correlated with alphav-integrin engagement together with histone H3 hyperacetylation and chromatin decondensation, allowing little cell spreading. By contrast, soft substrate (below 50 kPa) promoted morphological changes characteristic of apoptosis, including cell rounding, nucleus condensation, loss of focal adhesions and exposure of phosphatidylserine at the outer cell surface. On the basis of our data, we propose a selective and uncoupled contribution from the substrate elasticity to the regulation of replication and transcription activities for an epithelial cell model.
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Affiliation(s)
- Leyla Kocgozlu
- Institut National de la Santé et de la Recherche Médicale, INSERM Unité 977, 67085 Strasbourg Cedex, France
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Szarpak A, Cui D, Dubreuil F, De Geest BG, De Cock LJ, Picart C, Auzély-Velty R. Designing Hyaluronic Acid-Based Layer-by-Layer Capsules as a Carrier for Intracellular Drug Delivery. Biomacromolecules 2010; 11:713-20. [DOI: 10.1021/bm9012937] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Anna Szarpak
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
| | - Di Cui
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
| | - Frédéric Dubreuil
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
| | - Bruno G. De Geest
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
| | - Liesbeth J. De Cock
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
| | - Catherine Picart
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
| | - Rachel Auzély-Velty
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP53, 38041 Grenoble cedex 9, France, Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium, Minatec, Grenoble Institute of Technology and LMGP, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
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Boudou T, Crouzier T, Ren K, Blin G, Picart C. Multiple functionalities of polyelectrolyte multilayer films: new biomedical applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:441-67. [PMID: 20217734 DOI: 10.1002/adma.200901327] [Citation(s) in RCA: 511] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The design of advanced functional materials with nanometer- and micrometer-scale control over their properties is of considerable interest for both fundamental and applied studies because of the many potential applications for these materials in the fields of biomedical materials, tissue engineering, and regenerative medicine. The layer-by-layer deposition technique introduced in the early 1990s by Decher, Moehwald, and Lvov is a versatile technique, which has attracted an increasing number of researchers in recent years due to its wide range of advantages for biomedical applications: ease of preparation under "mild" conditions compatible with physiological media, capability of incorporating bioactive molecules, extra-cellular matrix components and biopolymers in the films, tunable mechanical properties, and spatio-temporal control over film organization. The last few years have seen a significant increase in reports exploring the possibilities offered by diffusing molecules into films to control their internal structures or design "reservoirs," as well as control their mechanical properties. Such properties, associated with the chemical properties of films, are particularly important for designing biomedical devices that contain bioactive molecules. In this review, we highlight recent work on designing and controlling film properties at the nanometer and micrometer scales with a view to developing new biomaterial coatings, tissue engineered constructs that could mimic in vivo cellular microenvironments, and stem cell "niches."
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Affiliation(s)
- Thomas Boudou
- Grenoble-INP, LMGP-MINATEC, CNRS UMR 5628 3, Parvis Louis Néel, 38016 Grenoble, France
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Abstract
Biomaterials form the basis of current and future biomedical technologies. They are routinely used to design therapeutic carriers, such as nanoparticles, for applications in drug delivery. Current strategies for synthesizing drug delivery carriers are based either on discovery of materials or development of fabrication methods. While synthetic carriers have brought upon numerous advances in drug delivery, they fail to match the sophistication exhibited by innate biological entities. In particular, red blood cells (RBCs), the most ubiquitous cell type in the human blood, constitute highly specialized entities with unique shape, size, mechanical flexibility, and material composition, all of which are optimized for extraordinary biological performance. Inspired by this natural example, we synthesized particles that mimic the key structural and functional features of RBCs. Similar to their natural counterparts, RBC-mimicking particles described here possess the ability to carry oxygen and flow through capillaries smaller than their own diameter. Further, they can also encapsulate drugs and imaging agents. These particles provide a paradigm for the design of drug delivery and imaging carriers, because they combine the functionality of natural RBCs with the broad applicability and versatility of synthetic drug delivery particles.
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Estrela-Lopis I, Iturri Ramos JJ, Donath E, Moya SE. Spectroscopic Studies on the Competitive Interaction between Polystyrene Sodium Sulfonate with Polycations and the N-Tetradecyl Trimethyl Ammonium Bromide Surfactant. J Phys Chem B 2009; 114:84-91. [DOI: 10.1021/jp908608u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- I. Estrela-Lopis
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany, and CIC biomaGUNE, Paseo Miramón 182 Edificio Empresarial C, 20009 San Sebastian, Gipuzkoa, Spain
| | - J. J. Iturri Ramos
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany, and CIC biomaGUNE, Paseo Miramón 182 Edificio Empresarial C, 20009 San Sebastian, Gipuzkoa, Spain
| | - E. Donath
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany, and CIC biomaGUNE, Paseo Miramón 182 Edificio Empresarial C, 20009 San Sebastian, Gipuzkoa, Spain
| | - S. E. Moya
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany, and CIC biomaGUNE, Paseo Miramón 182 Edificio Empresarial C, 20009 San Sebastian, Gipuzkoa, Spain
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Schweikart A, Horn A, Böker A, Fery A. Controlled Wrinkling as a Novel Method for the Fabrication of Patterned Surfaces. COMPLEX MACROMOLECULAR SYSTEMS I 2009. [DOI: 10.1007/12_2009_22] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Bernsmann F, Richert L, Senger B, Lavalle P, Voegel JC, Schaaf P, Ball V. Use of polymerisation to produce free-standing membranes from exponentially growing multilayer films. SOFT MATTER 2008; 4:1621-1624. [PMID: 32907155 DOI: 10.1039/b806649c] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this communication, we demonstrate that dopamine is able to undergo a polymerisation process in (PLL-HA)n polyelectrolyte multilayer films, and that this polymerisation is of the same nature as in solution at pH 8.5. This polymerisation changes the chemical composition and decreases the mobility of the PLL chains in the film, and ultimately allows the easy detachment of the film as free-standing membranes with 0.1 M HCl solutions.
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Affiliation(s)
- Falk Bernsmann
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085, Strasbourg Cedex, France. and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000, Strasbourg, France
| | - Ludovic Richert
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085, Strasbourg Cedex, France. and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000, Strasbourg, France
| | - Bernard Senger
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085, Strasbourg Cedex, France. and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000, Strasbourg, France
| | - Philippe Lavalle
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085, Strasbourg Cedex, France. and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000, Strasbourg, France
| | - Jean-Claude Voegel
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085, Strasbourg Cedex, France. and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000, Strasbourg, France
| | - Pierre Schaaf
- Centre National de la Recherche Scientifique(CNRS), Unité propre 22, Institut Charles Sadron, 23 rue du Loess, BP 84047, 67034, Strasbourg Cedex 2, France
| | - Vincent Ball
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085, Strasbourg Cedex, France. and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000, Strasbourg, France
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In situ transient study of polymer film growth via simultaneous correlation of charge, mass, and ellipsometric measurements. PURE APPL CHEM 2008. [DOI: 10.1351/pac200880112439] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Using three synchronized, in situ, nonintrusive, real-time characterization techniques to conduct transient observations, we revealed mechanistic details of a polymer film growth. A thin methylene green (MG) polymer coating (of the order of 35 nm) was used as a model system in this electrochemical microgravimetric imaging ellipsometry (EmIE) investigation. The direct correlation of changes in mass (via quartz crystal microbalance, QCM), ellipsometric angles (via imaging ellipsometry) with electrochemical conditions (in cyclic voltammetry, CV) provides discrete temporal and spatial information to help us decipher the underlying steps, from which we were able to separate adsorption, reduction, oxidation, desorption, and polymerization regimes involved in the deposition process. The evidence revealed in this study could have broad impact on the general understanding regarding how a film is deposited onto a metal surface.
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Patel PA, Dobrynin AV, Mather PT. Combined effect of spin speed and ionic strength on polyelectrolyte spin assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:12589-12597. [PMID: 17988161 DOI: 10.1021/la7020676] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Polyelectrolyte spin assembly (PSA) of multilayers is a sequential process featuring adsorption of oppositely charged polyelectrolytes from dilute solutions undergoing spin-coating flow. Here, we report on the dependence of PSA multilayer buildup of poly(sodium 4-styrenesulfonate) and poly(allylamine hydrochloride) on solution ionic strength and spin speed. We observed that at a given spin speed, the PSA coating growth rate (thickness/bilayer) and polymer surface coverage shows a nonmonotonic dependence on salt concentration, first increasing and then decreasing with increasing solution ionic strength. This is argued to be a manifestation of two competing mechanisms responsible for the layer formation. At low salt concentrations, the electrostatic interactions control the multilayer assembly process, while at high salt concentrations it is dominated by shear flow. We explain this nonmonotonic behavior in the framework of a Flory-like theory of multilayer formation from polyelectrolyte solution under shear flow. Additionally, the PSA process led to multilayer coatings with a radial dependence on thickness at lower spin speed in the shear-dominated regime. On increasing spin speed, such radial dependence subsided, eventually leading to uniform coatings by planarization. The surface topography of the multilayered coatings adsorbed at salt concentration less than 0.1 M was flat and featureless for all studied spin speeds. Unique morphological features in the films were formed at salt concentration higher than 0.1 M, the size of which depended on the spin speed and solution ionic strength.
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Affiliation(s)
- Pritesh A Patel
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
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