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Lux C, Kerz S, Ribeiro CC, Bareuther J, Lützenkirchen J, Stock S, Tsintsaris M, Rehahn M, Stark RW, von Klitzing R. Conceptualizing flexible papers using cellulose model surfaces and polymer particles. SOFT MATTER 2024; 20:1333-1346. [PMID: 38251414 DOI: 10.1039/d3sm01461d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Cellulose, as a naturally abundant and biocompatible material, is still gaining interest due to its high potential for functionalization. This makes cellulose a promising candidate for replacing plastics. Understanding how cellulose interacts with various additives is crucial for creating composite materials with diverse properties, as it is the case for plastics. In addition, the mechanical properties of the composite materials are assumed to be related to the mobility of the additives against the cellulose. Using a well-defined cellulose model surface (CMS), we aim to understand the adsorption and desorption of two polymeric particles (core-shell particles and microgels) to/from the cellulose surface. The nanomechanics of particles and CMS are quantified by indentation measurements with an atomic force microscope (AFM). AFM topography measurements quantified particle adsorption and desorption on the CMS, while peak force AFM measurements determined the force needed to move individual particles. Both particles and the CMS exhibited pH-dependent charge behavior, allowing a tunable interaction between them. Particle adsorption was irreversible and driven by electrostatic forces. In contrast, desorption and particle mobility forces are dominated by structural morphology. In addition, we found that an annealing procedure consisting of swelling/drying cycles significantly increased the adhesion strength of both particles. Using the data, we achieve a deeper understanding of the interaction of cellulose with polymeric particles, with the potential to advance the development of functional materials and contribute to various fields, including smart packaging, sensors, and biomedical applications.
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Affiliation(s)
- Cassia Lux
- Soft Matter at Interfaces, Department of Physics, 64289 Darmstadt, Germany.
| | - Sabrina Kerz
- Soft Matter at Interfaces, Department of Physics, 64289 Darmstadt, Germany.
| | - Catarina C Ribeiro
- Physics of Surfaces, Department of Material Science, 64287 Darmstadt, Germany
| | - Jennifer Bareuther
- Macromolecular Chemistry: Chemistry of Polymers, Department of Chemistry, 64287 Darmstadt, Germany
| | - Johannes Lützenkirchen
- Institute for Nuclear Disposal, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Sebastian Stock
- Soft Matter at Interfaces, Department of Physics, 64289 Darmstadt, Germany.
| | | | - Matthias Rehahn
- Macromolecular Chemistry: Chemistry of Polymers, Department of Chemistry, 64287 Darmstadt, Germany
| | - Robert W Stark
- Physics of Surfaces, Department of Material Science, 64287 Darmstadt, Germany
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Forg S, Guo X, von Klitzing R. Influence of Dopamine Methacrylamide on Swelling Behavior and Nanomechanical Properties of PNIPAM Microgels. ACS APPLIED MATERIALS & INTERFACES 2024; 16:1521-1534. [PMID: 38146181 DOI: 10.1021/acsami.3c15134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
The combination of the catechol-containing comonomer dopamine methacrylamide (DMA) with stimuli-responsive poly(N-isopropylacrylamide) (PNIPAM) microgels bears a huge potential in research and for applications due to the versatile properties of catechols. This research gives the first detailed insights into the influence of DMA on the swelling of PNIPAM microgels and their nanomechanical properties. Dynamic light scattering measurements showed that DMA decreases the volume phase transition temperature and completion temperature due to its higher hydrophobicity when compared to NIPAM, while sharpening the transition. The cross-linking ability of DMA decreases the swelling ratios and mesh sizes of the microgels. Microgels adsorbed at the solid surface are characterized by atomic force microscopy─as the DMA content increases, microgels protrude more from the surface. Force spectroscopy measurements below and above the volume phase transition temperature display a stiffening of the microgels with the incorporation of DMA and upon heating across its entire cross section as evidenced by an increase in the E modulus. This confirms the cross-linking ability of DMA. The affine network factor β, derived from the Flory-Rehner theory, is linearly correlated with the E moduli of both pure PNIPAM and P(NIPAM-co-DMA) microgels. However, large DMA amounts hinder the microgel shrinking while maintaining mechanical stiffness, possibly due to catechol interactions within the microgel network.
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Affiliation(s)
- Sandra Forg
- Soft Matter at Interfaces (SMI), Institute for Physics of Condensed Matter, Technical University of Darmstadt, 64289 Darmstadt, Germany
| | - Xuhong Guo
- School of Chemical Engineering, East China University of Science and Technology, 200231 Shanghai, China
| | - Regine von Klitzing
- Soft Matter at Interfaces (SMI), Institute for Physics of Condensed Matter, Technical University of Darmstadt, 64289 Darmstadt, Germany
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Takahara A, Richtering W, Walker GC. Preface to the Françoise M. Winnik Special Issue. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:5031-5032. [PMID: 35502539 DOI: 10.1021/acs.langmuir.2c00885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
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