1
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Alziyadi MO, Denton AR. Osmotic swelling behavior of surface-charged ionic microgels. J Chem Phys 2023; 159:184901. [PMID: 37942869 DOI: 10.1063/5.0161027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 10/19/2023] [Indexed: 11/10/2023] Open
Abstract
In recent years, ionic microgels have garnered much attention due to their unique properties, especially their stimulus-sensitive swelling behavior. The tunable response of these soft, permeable, compressible, charged colloidal particles is increasingly attractive for applications in medicine and biotechnologies, such as controlled drug delivery, tissue engineering, and biosensing. The ability to model and predict variation of the osmotic pressure of a single microgel with respect to changes in particle properties and environmental conditions proves vital to such applications. In this work, we apply both nonlinear Poisson-Boltzmann theory and molecular dynamics simulation to ionic microgels (macroions) in the cell model to compute density profiles of microions (counterions, coions), single-microgel osmotic pressure, and equilibrium swelling ratios of spherical microgels whose fixed charge is confined to the macroion surface. The basis of our approach is an exact theorem that relates the electrostatic component of the osmotic pressure to the microion density profiles. Close agreement between theory and simulation serves as a consistency check to validate our approach. We predict that surface-charged microgels progressively deswell with increasing microgel concentration, starting well below close packing, and with increasing salt concentration, in qualitative agreement with experiments. Comparison with previous results for microgels with fixed charge uniformly distributed over their volume demonstrates that surface-charged microgels deswell more rapidly than volume-charged microgels. We conclude that swelling behavior of ionic microgels in solution is sensitive to the distribution of fixed charge within the polymer-network gel and strongly depends on bulk concentrations of both microgels and salt ions.
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Affiliation(s)
- Mohammed O Alziyadi
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
| | - Alan R Denton
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
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2
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Vijayakumar B, Takatsuka M, Sasaki K, Kita R, Shinyashiki N, Yagihara S, Rathnasabapathy S. Dielectric relaxation of ice in a partially crystallized poly( N-isopropylacrylamide)microgel suspension compared to other partially crystalized polymer-water mixtures. Phys Chem Chem Phys 2023; 25:22223-22231. [PMID: 37566434 DOI: 10.1039/d3cp02116e] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
A broadband dielectric spectroscopy study was conducted on a partially crystallized 10 wt% poly(N-isopropylacrylamide) [PNIPAM] microgel aqueous suspension to investigate the dielectric relaxation of ice in microgel suspensions. The measurements covered a frequency range of 10 mHz to 10 MHz and at temperatures ranging from 123 K to 273 K. Two distinct relaxation processes were observed at specific frequencies below the melting temperature. One is associated with the combination of the local chain motion of PNIPAM and interfacial polarization in the uncrystallized phase, while another is associated with ice. To understand the temperature-dependent behaviour of the ice relaxation process, the relaxation time of ice was compared with those observed in other frozen polymer water mixtures, including gelatin, poly-vinylpyrrolidone (PVP), and bovine serum albumin (BSA). For concentrations ≥ 10 wt%, the temperature dependence of the relaxation time of ice was found to be independent. Therefore, the study primarily focused on the 10 wt% data for easier comprehension of the ice relaxation process. It was found that the microgel and globular protein BSA had no significant effect on ice crystallization, while gelatin slowed down the crystallization process, and PVP accelerated it. To discuss the mechanism of the dielectric relaxation of ice, the trap-controlled proton transport model developed by Khamzin et al. [Chem. Phys., 2021, 541, 111040.] was employed. The model was used to discuss the dynamic heterogeneity of ice observed in this investigation, distinguishing it from the spatial heterogeneity of ice commonly discussed.
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Affiliation(s)
- Balachandar Vijayakumar
- Department of Physics, Sathyabama Institute of Science and Technology, Chennai-600119, India. drrskumar@
- Centre for Nanoscience and Nanotechnology, Sathyabama Institute of Science and Technology, Chennai-600119, India
| | - Masanobu Takatsuka
- Graduate School of Science and Technology, Tokai University, Kanagawa 259-1292, Japan
| | - Kaito Sasaki
- Department of Physics, Tokai University, Kanagawa 259-1292, Japan.
- Micro/Nano Technology Centre, Tokai University, Kanagawa 259-1292, Japan
| | - Rio Kita
- Department of Physics, Tokai University, Kanagawa 259-1292, Japan.
- Micro/Nano Technology Centre, Tokai University, Kanagawa 259-1292, Japan
| | - Naoki Shinyashiki
- Department of Physics, Tokai University, Kanagawa 259-1292, Japan.
- Micro/Nano Technology Centre, Tokai University, Kanagawa 259-1292, Japan
| | - Shin Yagihara
- Department of Physics, Tokai University, Kanagawa 259-1292, Japan.
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3
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Hidayah AN, Herbani Y, Steven E, Subhan A, Triyono D, Isnaeni, Suliyanti MM, Shiddiq M. Tuning the electrical properties of colloidal nanoalloys by varying their composition. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Su YH, Shih CY, Su CH, Lee YL, Hsieh CT, Teng H. Dielectric gel electrolytes for safe charge storage from −20 to 80°C by double-layer capacitors. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Kang K, Platten F. Electric-field induced modulation of amorphous protein aggregates: polarization, deformation, and reorientation. Sci Rep 2022; 12:3061. [PMID: 35197521 PMCID: PMC8866516 DOI: 10.1038/s41598-022-06995-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 02/09/2022] [Indexed: 11/09/2022] Open
Abstract
Proteins in their native state are only marginally stable and tend to aggregate. However, protein misfolding and condensation are often associated with undesired processes, such as pathogenesis, or unwanted properties, such as reduced biological activity, immunogenicity, or uncontrolled materials properties. Therefore, controlling protein aggregation is very important, but still a major challenge in various fields, including medicine, pharmacology, food processing, and materials science. Here, flexible, amorphous, micron-sized protein aggregates composed of lysozyme molecules reduced by dithiothreitol are used as a model system. The preformed amorphous protein aggregates are exposed to a weak alternating current electric field. Their field response is followed in situ by time-resolved polarized optical microscopy, revealing field-induced deformation, reorientation and enhanced polarization as well as the disintegration of large clusters of aggregates. Small-angle dynamic light scattering was applied to probe the collective microscopic dynamics of amorphous aggregate suspensions. Field-enhanced local oscillations of the intensity auto-correlation function are observed and related to two distinguishable elastic moduli. Our results validate the prospects of electric fields for controlling protein aggregation processes.
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Affiliation(s)
- Kyongok Kang
- Forschungszentrum Jülich, Institute of Biological Information Processing IBI-4, Biomacromolecular Systems and Processes, Jülich, Germany.
| | - Florian Platten
- Forschungszentrum Jülich, Institute of Biological Information Processing IBI-4, Biomacromolecular Systems and Processes, Jülich, Germany.
- Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany.
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6
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Vijayakumar B, Takatsuka M, Kita R, Shinyashiki N, Yagihara S, Rathinasabapathy S. Dynamics of the Poly(N-Isopropylacrylamide) Microgel Aqueous Suspension Investigated by Dielectric Relaxation Spectroscopy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Balachandar Vijayakumar
- Department of Physics, Sathyabama Institute of Science and Technology, Chennai 600119, India
| | - Masanobu Takatsuka
- Graduate School of Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
| | - Rio Kita
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
- Micro/Nano Technology Center, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
| | - Naoki Shinyashiki
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
- Micro/Nano Technology Center, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
| | - Shin Yagihara
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
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7
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Bergman MJ, Nöjd S, Mohanty PS, Boon N, Immink JN, Maris JJE, Stenhammar J, Schurtenberger P. On the role of softness in ionic microgel interactions. SOFT MATTER 2021; 17:10063-10072. [PMID: 34714903 PMCID: PMC8597585 DOI: 10.1039/d1sm01222c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 10/24/2021] [Indexed: 05/17/2023]
Abstract
Thermoresponsive microgels are a popular model system to study phase transitions in soft matter, because temperature directly controls their volume fraction. Ionic microgels are additionally pH-responsive and possess a rich phase diagram. Although effective interaction potentials between microgel particles have been proposed, these have never been fully tested, leading to a gap in our understanding of the link between single-particle and collective properties. To help resolve this gap, four sets of ionic microgels with varying crosslinker density were synthesised and characterised using light scattering techniques and confocal microscopy. The resultant structural and dynamical information was used to investigate how particle softness affects the phase behaviour of ionic microgels and to validate the proposed interaction potential. We find that the architecture of the microgel plays a marked role in its phase behaviour. Rather than the ionic charges, it is the dangling ends which drive phase transitions and interactions at low concentration. Comparison to theory underlines the need for a refined theoretical model which takes into consideration these close-contact interactions.
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Affiliation(s)
- Maxime J Bergman
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - Sofi Nöjd
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - Priti S Mohanty
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - Niels Boon
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - Jasper N Immink
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - J J Erik Maris
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - Joakim Stenhammar
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
| | - Peter Schurtenberger
- Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden.
- Lund Institute for advanced Neutron and X-ray Science (LINXS), Lund University, Lund, Sweden
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8
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Alvarez L, Fernandez-Rodriguez MA, Alegria A, Arrese-Igor S, Zhao K, Kröger M, Isa L. Reconfigurable artificial microswimmers with internal feedback. Nat Commun 2021; 12:4762. [PMID: 34362934 PMCID: PMC8346629 DOI: 10.1038/s41467-021-25108-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 07/17/2021] [Indexed: 11/09/2022] Open
Abstract
Self-propelling microparticles are often proposed as synthetic models for biological microswimmers, yet they lack the internally regulated adaptation of their biological counterparts. Conversely, adaptation can be encoded in larger-scale soft-robotic devices but remains elusive to transfer to the colloidal scale. Here, we create responsive microswimmers, powered by electro-hydrodynamic flows, which can adapt their motility via internal reconfiguration. Using sequential capillary assembly, we fabricate deterministic colloidal clusters comprising soft thermo-responsive microgels and light-absorbing particles. Light absorption induces preferential local heating and triggers the volume phase transition of the microgels, leading to an adaptation of the clusters' motility, which is orthogonal to their propulsion scheme. We rationalize this response via the coupling between self-propulsion and variations of particle shape and dielectric properties upon heating. Harnessing such coupling allows for strategies to achieve local dynamical control with simple illumination patterns, revealing exciting opportunities for developing tactic active materials.
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Affiliation(s)
- L Alvarez
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, Zurich, Switzerland.
| | - M A Fernandez-Rodriguez
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, Zurich, Switzerland
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, Granada, Spain
| | - A Alegria
- Centro de Física de Materiales (CSIC-UPV/EHU), Materials Physics Center, San Sebastián, Spain
| | - S Arrese-Igor
- Centro de Física de Materiales (CSIC-UPV/EHU), Materials Physics Center, San Sebastián, Spain
| | - K Zhao
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, Zurich, Switzerland
| | - M Kröger
- Polymer Physics, Department of Materials, ETH Zurich, Zurich, Switzerland
| | - Lucio Isa
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, Zurich, Switzerland.
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9
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Şarkaya K, Yildirim M, Alli A. One‐step preparation of poly(
NIPAM‐pyrrole
) electroconductive composite hydrogel and its dielectric properties. J Appl Polym Sci 2021. [DOI: 10.1002/app.50527] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Koray Şarkaya
- Department of Chemistry, Faculty of Arts & Sciences Düzce University Düzce Turkey
| | - Mert Yildirim
- Department of Mechatronics Engineering, Faculty of Engineering Düzce University Düzce Turkey
| | - Abdulkadir Alli
- Department of Chemistry, Faculty of Arts & Sciences Düzce University Düzce Turkey
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10
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Aguirre-Manzo LA, Ledesma-Motolinía M, Rojas-Ochoa LF, Trappe V, Callejas-Fernández J, Haro-Pérez C, González-Mozuelos P. Accounting for effective interactions among charged microgels. Phys Rev E 2019; 100:032602. [PMID: 31640009 DOI: 10.1103/physreve.100.032602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Indexed: 06/10/2023]
Abstract
We introduce a theoretical approach to describe structural correlations among charged permeable spheres at finite particle concentrations. This theory explicitly accounts for correlations among microions and between microions and macroions and allows for the proposal of an effective interaction among macroions that successfully captures structural correlations observed in poly-N-isopropyl acrylamide microgel systems. In our description the bare charge is fixed and independent of the microgel size, the microgel concentration, and the ionic strength, which contrasts with results obtained using linear response approximations, where the bare charge needs to be adapted to properly account for microgel correlations obtained at different conditions.
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Affiliation(s)
- L A Aguirre-Manzo
- Departamento de Física, Cinvestav del I. P. N., Av. Instituto Politécnico Nacional 2508, 07360 Ciudad de México, Mexico
| | - M Ledesma-Motolinía
- Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-Azcapotzalco, 02200 Ciudad de México, Mexico
| | - L F Rojas-Ochoa
- Departamento de Física, Cinvestav del I. P. N., Av. Instituto Politécnico Nacional 2508, 07360 Ciudad de México, Mexico
| | - V Trappe
- Departement de Physique, Université de Fribourg, 1700 Fribourg, Switzerland
| | | | - C Haro-Pérez
- Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-Azcapotzalco, 02200 Ciudad de México, Mexico
| | - P González-Mozuelos
- Departamento de Física, Cinvestav del I. P. N., Av. Instituto Politécnico Nacional 2508, 07360 Ciudad de México, Mexico
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11
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Nöjd S, Hirst C, Obiols-Rabasa M, Schmitt J, Radulescu A, Mohanty PS, Schurtenberger P. Soft particles in an electric field - a zero average contrast study. SOFT MATTER 2019; 15:6369-6374. [PMID: 31304503 DOI: 10.1039/c9sm01208g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report on the structural properties of ionic microgel particles subjected to alternating electric fields, using small-angle neutron scattering. The experiments were performed under so-called zero average contrast conditions, which cancel the structure factor contribution to the scattered intensity, allowing us to obtain direct information on the single particle size and structure as particles align in field-induced strings. Our results reveal only a marginal compression of the particles as they align in strings, and indicate considerable particle overlap at higher field strengths. These findings provide further insight into the origins of the previously reported unusual path dependent field-induced crystal-crystal transition found for these systems (P. S. Mohanty et al., Phys. Rev. X, 2015, 5, 011030).
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Affiliation(s)
- Sofi Nöjd
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Christopher Hirst
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Marc Obiols-Rabasa
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Julien Schmitt
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Aurel Radulescu
- Jülich Centre for Neutron Science, Heinz Maier-Leibnitz Zentrum, Garching, Germany
| | - Priti S Mohanty
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden and School of Chemical Technology, Kaligan Institute of Industrial Technology (KIIT), Bhubaneswar, India
| | - Peter Schurtenberger
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden and Lund Institute of advanced Neutron and X-ray Science (LINXS), Lund University, Lund, Sweden.
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12
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Jathavedan K, Bhat SK, Mohanty PS. Alternating electric-field-induced assembly of binary mixtures of soft repulsive ionic microgel colloids. J Colloid Interface Sci 2019; 544:88-95. [PMID: 30826533 DOI: 10.1016/j.jcis.2019.02.075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 02/21/2019] [Accepted: 02/21/2019] [Indexed: 11/17/2022]
Abstract
An external alternating electric field is used to study the assembly of a binary mixture of Poly(N-isopropylacrylamide-co-acrylic acid) microgels in their swollen form at hydrodynamic size ratio 2:1 under deprotonated state. The AC field experiments were carried out at a fixed frequency of 100 kHz in the fluid regime for three number density ratios 1:3, 1:1 and 3:1 of big-to-small microgels using a confocal microscope. Strings with different types of co-assembly structures such as buckled, ring, flame and sandwich have been observed at low and intermediate field strengths at ratio 1:3, 1:1. In buckled and ring type, one or two small particles sit at the contact of two big particles and in the flame type, small particles arrange like a cone at end of the string. In the sandwich structure, several double small particle layers lie in between big particles. At high field strength, aggregation of strings and a phase separation into individual aggregates of strings from both big and small microgels have been observed. At higher ratio 3:1, the string formation is mostly dominated by big particles. Our experimental results are discussed with the recent simulation and experimental works on AC field induced structures in binary hard sphere mixtures.
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Affiliation(s)
- Kiran Jathavedan
- Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Suresh K Bhat
- Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, India.
| | - Priti S Mohanty
- School of Chemical Technology and Biotechnology, Kalinga Institute of Industrial Technology (KIIT), Deemed to be University, Bhubaneswar 751024, India.
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13
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Responsive hydrogel colloids: Structure, interactions, phase behavior, and equilibrium and nonequilibrium transitions of microgel dispersions. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.02.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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14
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Bergman MJ, Gnan N, Obiols-Rabasa M, Meijer JM, Rovigatti L, Zaccarelli E, Schurtenberger P. A new look at effective interactions between microgel particles. Nat Commun 2018; 9:5039. [PMID: 30487527 PMCID: PMC6262015 DOI: 10.1038/s41467-018-07332-5] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 10/30/2018] [Indexed: 11/09/2022] Open
Abstract
Thermoresponsive microgels find widespread use as colloidal model systems, because their temperature-dependent size allows facile tuning of their volume fraction in situ. However, an interaction potential unifying their behavior across the entire phase diagram is sorely lacking. Here we investigate microgel suspensions in the fluid regime at different volume fractions and temperatures, and in the presence of another population of small microgels, combining confocal microscopy experiments and numerical simulations. We find that effective interactions between microgels are clearly temperature dependent. In addition, microgel mixtures possess an enhanced stability compared to hard colloid mixtures - a property not predicted by a simple Hertzian model. Based on numerical calculations we propose a multi-Hertzian model, which reproduces the experimental behavior for all studied conditions. Our findings highlight that effective interactions between microgels are much more complex than usually assumed, displaying a crucial dependence on temperature and on the internal core-corona architecture of the particles.
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Affiliation(s)
- Maxime J Bergman
- Division of Physical Chemistry, Department of Chemistry, Lund University, PO Box 124, SE-22100, Lund, Sweden
| | - Nicoletta Gnan
- CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185, Roma, Italy
| | - Marc Obiols-Rabasa
- Division of Physical Chemistry, Department of Chemistry, Lund University, PO Box 124, SE-22100, Lund, Sweden.,CR Competence AB, Naturvetarevägen 14, 22362, Lund, Sweden
| | - Janne-Mieke Meijer
- Division of Physical Chemistry, Department of Chemistry, Lund University, PO Box 124, SE-22100, Lund, Sweden.,Department of Physics, University of Konstanz, PO Box 688, D-78457, Konstanz, Germany
| | - Lorenzo Rovigatti
- CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185, Roma, Italy
| | - Emanuela Zaccarelli
- CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185, Roma, Italy.
| | - Peter Schurtenberger
- Division of Physical Chemistry, Department of Chemistry, Lund University, PO Box 124, SE-22100, Lund, Sweden.
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15
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Colla T, Mohanty PS, Nöjd S, Bialik E, Riede A, Schurtenberger P, Likos CN. Self-Assembly of Ionic Microgels Driven by an Alternating Electric Field: Theory, Simulations, and Experiments. ACS NANO 2018; 12:4321-4337. [PMID: 29634232 DOI: 10.1021/acsnano.7b08843] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The structural properties of a system of ionic microgels under the influence of an alternating electric field are investigated both theoretically and experimentally. This combined investigation aims to shed light on the structural transitions that can be induced by changing either the driving frequency or the strength of the applied field, which range from string-like formation along the field to crystal-like structures across the orthogonal plane. In order to highlight the physical mechanisms responsible for the observed particle self-assembly, we develop a coarse-grained description, in which effective interactions among the charged microgels are induced by both equilibrium ionic distributions and their time-averaged hydrodynamic responses to the applied field. These contributions are modeled by the buildup of an effective dipole moment at the microgels backbones, which is partially screened by their ionic double layer. We show that this description is able to capture the structural properties of this system, allowing for very good agreement with the experimental results. The model coarse-graining parameters are indirectly obtained via the measured pair distribution functions and then further assigned with a clear physical interpretation, allowing us to highlight the main physical mechanisms accounting for the observed self-assembly behavior.
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Affiliation(s)
- Thiago Colla
- Instituto de Física , Universidade Federal de Ouro Preto , CEP 35400-000 Ouro Preto , Minas Gerais , Brazil
- Faculty of Physics , University of Vienna , Boltzmanngasse 5 , 1090 Vienna , Austria
| | - Priti S Mohanty
- Division of Physical Chemistry , Lund University , SE-221 00 Lund , Sweden
- School of Chemical Technology , Kalinga Institute of Industrial Technology (KIIT) , Bhubaneswar 751024 , India
| | - Sofi Nöjd
- Division of Physical Chemistry , Lund University , SE-221 00 Lund , Sweden
| | - Erik Bialik
- Division of Physical Chemistry , Lund University , SE-221 00 Lund , Sweden
| | - Aaron Riede
- Division of Physical Chemistry , Lund University , SE-221 00 Lund , Sweden
| | | | - Christos N Likos
- Faculty of Physics , University of Vienna , Boltzmanngasse 5 , 1090 Vienna , Austria
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16
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Aravopoulou D, Kyriakos K, Miasnikova A, Laschewsky A, Papadakis CM, Kyritsis A. Comparative Investigation of the Thermoresponsive Behavior of Two Diblock Copolymers Comprising PNIPAM and PMDEGA Blocks. J Phys Chem B 2018; 122:2655-2668. [DOI: 10.1021/acs.jpcb.7b09647] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Dionysia Aravopoulou
- Physics Department, National Technical University of Athens, Iroon Polytechneiou 9, Zografou Campus, Athens 15780, Greece
| | - Konstantinos Kyriakos
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Anna Miasnikova
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
| | - André Laschewsky
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
- Fraunhofer Institut für Angewandte Polymerforschung, Geiselbergstr. 69, 14476 Potsdam-Golm, Germany
| | - Christine M. Papadakis
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Apostolos Kyritsis
- Physics Department, National Technical University of Athens, Iroon Polytechneiou 9, Zografou Campus, Athens 15780, Greece
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