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Vialetto J, Camerin F, Ramakrishna SN, Zaccarelli E, Isa L. Exploring the 3D Conformation of Hard-Core Soft-Shell Particles Adsorbed at a Fluid Interface. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303404. [PMID: 37541434 PMCID: PMC10558683 DOI: 10.1002/advs.202303404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/11/2023] [Indexed: 08/06/2023]
Abstract
The encapsulation of a rigid core within a soft polymeric shell allows obtaining composite colloidal particles that retain functional properties, e.g., optical or mechanical. At the same time, it favors their adsorption at fluid interfaces with a tunable interaction potential to realize tailored two-dimensional (2D) materials. Although they have already been employed for 2D assembly, the conformation of single particles, which is essential to define the monolayer properties, has been largely inferred via indirect or ex situ techniques. Here, by means of in situ atomic force microscopy experiments, the authors uncover the interfacial morphology of hard-core soft-shell microgels, integrating the data with numerical simulations to elucidate the role of the core properties, of the shell thicknesses, and that of the grafting density. They identify that the hard core can influence the conformation of the polymer shells. In particular, for the case of small shell thickness, low grafting density, or poor core affinity for water, the core protrudes more into the organic phase, and the authors observe a decrease in-plane stretching of the network at the interface. By rationalizing their general wetting behavior, such composite particles can be designed to exhibit specific inter-particle interactions of importance both for the stabilization of interfaces and for the fabrication of 2D materials with tailored functional properties.
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Affiliation(s)
- Jacopo Vialetto
- Laboratory for Soft Materials and InterfacesDepartment of MaterialsETH ZürichVladimir‐Prelog‐Weg 5Zürich8093Switzerland
- Present address:
Department of Chemistry & CSGIUniversity of Florence, via della Lastruccia 3Sesto FiorentinoFirenzeI‐50019Italy
| | - Fabrizio Camerin
- CNR Institute for Complex SystemsUos SapienzaP.le A. Moro 2Roma00185Italy
- Department of PhysicsSapienza University of RomeP.le A. Moro 2Roma00185Italy
- Soft Condensed Matter & BiophysicsDebye Institute for Nanomaterials ScienceUtrecht UniversityPrincetonplein 1CC Utrecht3584The Netherlands
| | - Shivaprakash N. Ramakrishna
- Laboratory for Soft Materials and InterfacesDepartment of MaterialsETH ZürichVladimir‐Prelog‐Weg 5Zürich8093Switzerland
| | - Emanuela Zaccarelli
- CNR Institute for Complex SystemsUos SapienzaP.le A. Moro 2Roma00185Italy
- Department of PhysicsSapienza University of RomeP.le A. Moro 2Roma00185Italy
| | - Lucio Isa
- Laboratory for Soft Materials and InterfacesDepartment of MaterialsETH ZürichVladimir‐Prelog‐Weg 5Zürich8093Switzerland
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Walkowiak JJ, van Duijnhoven C, Boeschen P, Wolter NA, Michalska-Walkowiak J, Dulle M, Pich A. Multicompartment polymeric colloids from functional precursor Microgel: Synthesis in continuous process. J Colloid Interface Sci 2023; 634:243-254. [PMID: 36535162 DOI: 10.1016/j.jcis.2022.12.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/25/2022] [Accepted: 12/10/2022] [Indexed: 12/15/2022]
Abstract
Raspberry-like poly(oligoethylene methacrylate-b-N-vinylcaprolactam)/polystyrene (POEGMA-b-PVCL/PS) patchy particles (PPs) and complex colloidal particle clusters (CCPCs) were fabricated in two-, and one-step (cascade) flow process. Surfactant-free, photo-initiated reversible addition-fragmentation transfer (RAFT) precipitation polymerization (Photo-RPP) was used to develop internally cross-linked POEGMA-b-PVCL microgels with narrow size distribution. Resulting microgel particles were then used to stabilize styrene seed droplets in water, producing raspberry-like PPs. In the cascade process, different hydrophobicity between microgel and PS induced the self-assembly of the first formed raspberry particles that then polymerized continuously in a Pickering emulsion to form the CCPCs. The internal structure as well as the surface morphology of PPs and CCPCs were studied as a function of polymerization conditions such as flow rate/retention time (Rt), temperature and the amount of used cross-linker. By performing Photo-RPP in tubular flow reactor we were able to gained advantages over heat dissipation and homogeneous light distribution in relation to thermally-, and photo-initiated bulk polymerizations. Tubular reactor also enabled detailed studies over morphological evolution of formed particles as a function of flow rate/Rt.
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Affiliation(s)
- Jacek J Walkowiak
- DWI - Leibniz-Institute for Interactive Materials e.V, Forckenbeckstraße 50, 52074 Aachen, Germany; Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany; Aachen-Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Urmonderbaan 22, 6167 RD Geleen, The Netherlands.
| | - Casper van Duijnhoven
- Zuyd University of Applied Sciences, Nieuw Eyckholt 300, 6419 DJ Heerlen, The Netherlands.
| | - Pia Boeschen
- Aachen-Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Urmonderbaan 22, 6167 RD Geleen, The Netherlands.
| | - Nadja A Wolter
- DWI - Leibniz-Institute for Interactive Materials e.V, Forckenbeckstraße 50, 52074 Aachen, Germany; Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany.
| | - Joanna Michalska-Walkowiak
- Jülich Centre for Neutron Science (JCNS-1), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straβe, 52428 Jülich, Germany; CNRS, UMR 8232 - IPCM - Institut Parisien de Chimie Moléculaire - Polymer Chemistry Team, Sorbonne Université, 4 Pl. Jussieu, 75005 Paris, France.
| | - Martin Dulle
- Jülich Centre for Neutron Science (JCNS-1), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straβe, 52428 Jülich, Germany.
| | - Andrij Pich
- DWI - Leibniz-Institute for Interactive Materials e.V, Forckenbeckstraße 50, 52074 Aachen, Germany; Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany; Aachen-Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Urmonderbaan 22, 6167 RD Geleen, The Netherlands.
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Rudov AA, Portnov IV, Bogdanova AR, Potemkin II. Structure of swollen hollow polyelectrolyte nanogels with inhomogeneous cross-link distribution. J Colloid Interface Sci 2023; 640:1015-1028. [PMID: 36921382 DOI: 10.1016/j.jcis.2023.02.090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 01/31/2023] [Accepted: 02/16/2023] [Indexed: 02/23/2023]
Abstract
HYPOTHESIS Recently, it has become possible to synthesize hollow polyelectrolyte nano- and microgels. The shell permeability can be controlled by external stimuli, while the cavity can serve as a storage place for guest molecules. However, there is a lack of a detailed understanding at the molecular level regarding the role of the network topology, inhomogeneities of the distribution of cross-links, and the impact of the electrostatics on the structural response of hollow microgel to external stimuli. To bridge these gaps, molecular dynamics (MD) of computer simulations are used. EXPERIMENTS Here, we propose a fresh methodology to create realistic hollow microgel particles in silico. The technique involves a gradual change in the average local length of subchains depending on the distance to the center of mass of the microgel particles resulting in the microgels with a non-uniform distribution of cross-linking species. In particular, a series of microgels with (i) a highly cross-linked inner part of the shell and gradually decreased cross-linker concentration towards the periphery, (ii) microgels with loosely cross-linked inner and outer parts, as well as (iii) microgels with a more-or-less homogeneous structure, have been created and validated. Counterions and salt ions are taken into account explicitly, and electrostatic interactions are described by the Coulomb potential. FINDINGS Our studies reveal a strong dependence of the microgel swelling response on the network topology. Simple redistribution of cross-links plays a significant role in the structure of the microgels, including cavity size, microgel size, fuzziness, and extension of the inner and outer parts of the microgels. Our results indicate the possibilities of qualitative justification of the structure of the hollow microgels in the experiments by measuring the relative change in the size of the sacrificial core to the size of the cavity and by estimation of a power law function, [Formula: see text] , of the hydrodynamic radius of the hollow microgels as a function of added salt concentration.
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Affiliation(s)
- Andrey A Rudov
- Physics Department, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Ivan V Portnov
- Physics Department, Lomonosov Moscow State University, Moscow, Russian Federation; A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow 119991, Russian Federation
| | - Alisa R Bogdanova
- Physics Department, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Moscow, Russian Federation.
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4
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Kuk K, Abgarjan V, Gregel L, Zhou Y, Carrasco Fadanelli V, Buttinoni I, Karg M. Compression of colloidal monolayers at liquid interfaces: in situ vs. ex situ investigation. SOFT MATTER 2023; 19:175-188. [PMID: 36426847 DOI: 10.1039/d2sm01125e] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The assembly of colloidal particles at liquid/liquid or air/liquid interfaces is a versatile procedure to create microstructured monolayers and study their behavior under compression. When combined with soft and deformable particles such as microgels, compression is used to tune not only the interparticle distance but also the underlying microstructure of the monolayer. So far, the great majority of studies on microgel-laden interfaces are conducted ex situ after transfer to solid substrates, for example, via Langmuir-Blodgett deposition. This type of analysis relies on the stringent assumption that the microstructure is conserved during transfer and subsequent drying. In this work, we couple a Langmuir trough to a custom-built small-angle light scattering setup to monitor colloidal monolayers in situ during compression. By comparing the results with ex situ and in situ microscopy measurements, we conclude that Langmuir-Blodgett deposition can alter the structural properties of the colloidal monolayers significantly.
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Affiliation(s)
- Keumkyung Kuk
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany.
| | - Vahan Abgarjan
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany.
| | - Lukas Gregel
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany.
| | - Yichu Zhou
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany.
| | - Virginia Carrasco Fadanelli
- Institut für Experimentelle Physik der kondensierten Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - Ivo Buttinoni
- Institut für Experimentelle Physik der kondensierten Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - Matthias Karg
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany.
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5
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Kuk K, Gregel L, Abgarjan V, Croonenbrock C, Hänsch S, Karg M. Micron-Sized Silica-PNIPAM Core-Shell Microgels with Tunable Shell-To-Core Ratio. Gels 2022; 8:gels8080516. [PMID: 36005117 PMCID: PMC9407347 DOI: 10.3390/gels8080516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 08/09/2022] [Accepted: 08/12/2022] [Indexed: 11/16/2022] Open
Abstract
Micron-sized hard core-soft shell hybrid microgels are promising model systems for studies of soft matter as they enable in-situ optical investigations and their structures/morphologies can be engineered with a great variety. Yet, protocols that yield micron-sized core-shell microgels with a tailorable shell-to-core size ratio are rarely available. In this work, we report on the one-pot synthesis protocol for micron-sized silica-poly(N-isopropylacrylamide) core-shell microgels that has excellent control over the shell-to-core ratio. Small-angle light scattering and microscopy of 2- and 3-dimensional assemblies of the synthesized microgels confirm that the produced microgels are monodisperse and suitable for optical investigation even at high packing fractions.
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Affiliation(s)
- Keumkyung Kuk
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
| | - Lukas Gregel
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
| | - Vahan Abgarjan
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
| | - Caspar Croonenbrock
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
| | - Sebastian Hänsch
- Center for Advanced Imaging, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Matthias Karg
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
- Correspondence: ; Tel.: +49-211-81-12400
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6
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Fandrich P, Annegarn M, Wiehemeier L, Ehring I, Kottke T, Hellweg T. Core-shell microgels synthesized in continuous flow: deep insight into shell growth using temperature-dependent FTIR. SOFT MATTER 2022; 18:5492-5501. [PMID: 35843118 DOI: 10.1039/d2sm00598k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
While core-shell microgels have been intensively studied in their fully synthesized state, the formation mechanism of the shell has not been completely understood. Such insight is decisive for a customization of microgel properties for applications. In this work, microgels based on a N-isopropylmethacrylamide (NiPMAM) core and a N-n-propylacrylamide (NnPAM) shell are synthesized in a continuous flow reactor. The shell growth is studied depending on the solution's time of residence inside the reactor. PCS experiments reveal a significant decrease of the volume phase transition temperatures of the core and the shell, with increasing residence time. At early stages, a decreased swelling capacity is found before a discrete NnPAM shell is formed. Temperature-dependent FTIR spectroscopy shows that the decreased swelling capacity originates from a pronounced interpenetrated network (IPN) between NnPAM and NiPMAM. AFM images resolve heterogeneously distributed shell material after 3 min, pointing to an aggregation of NnPAM domains before the distinct shell forms. The combination of diffusional properties, AFM images and vibrational information confirms a deeply interpenetrated network already at early stages of the precipitation polymerization, in which the shell material heavily influences the swelling properties.
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Affiliation(s)
- Pascal Fandrich
- Physical and Biophysical Chemistry, Bielefeld University, 33615 Bielefeld, Germany.
| | - Marco Annegarn
- Physical and Biophysical Chemistry, Bielefeld University, 33615 Bielefeld, Germany.
| | - Lars Wiehemeier
- Physical and Biophysical Chemistry, Bielefeld University, 33615 Bielefeld, Germany.
| | - Ina Ehring
- Physical and Biophysical Chemistry, Bielefeld University, 33615 Bielefeld, Germany.
| | - Tilman Kottke
- Biophysical Chemistry and Diagnostics, Bielefeld University, 33615 Bielefeld, Germany
| | - Thomas Hellweg
- Physical and Biophysical Chemistry, Bielefeld University, 33615 Bielefeld, Germany.
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7
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Sabadasch V, Fandrich P, Annegarn M, Hellweg T. Effect of Methacrylic Acid in PNNPAM Microgels on the Catalytic Activity of Embedded Palladium Nanoparticles. MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202200045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Viktor Sabadasch
- Physical and Biophysical Chemistry Bielefeld University Bielefeld 33615 Germany
| | - Pascal Fandrich
- Physical and Biophysical Chemistry Bielefeld University Bielefeld 33615 Germany
| | - Marco Annegarn
- Physical and Biophysical Chemistry Bielefeld University Bielefeld 33615 Germany
| | - Thomas Hellweg
- Physical and Biophysical Chemistry Bielefeld University Bielefeld 33615 Germany
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8
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Bergman MJ, García-Astrain C, Fuchs N, Manne K, Yazhgur P, Froufe-Pérez LS, Liz-Marzán LM, Scheffold F. Macroporous Silica Foams Fabricated via Soft Colloid Templating. SMALL METHODS 2022; 6:e2101491. [PMID: 35218331 DOI: 10.1002/smtd.202101491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 02/05/2022] [Indexed: 06/14/2023]
Abstract
Macroporous materials with controlled pore sizes are of high scientific and technological interest, due to their low specific weight, as well as unique acoustic, thermal, or optical properties. Solid foams made of titania, silica, or silicon, as representative materials, have been previously obtained with several hundred nanometer pore sizes, by using sacrificial templates such as spherical emulsion droplets or colloidal particles. Macroporous structures in particular are excellent candidates as photonic materials with applications in structural coloration and photonic bandgap devices. However, whereas using spherical building blocks as templates may provide tight control over pore shape and size, it results in materials with an often unfavorable local topology. Templating dry-foam or compressed-emulsion structures appear as attractive alternatives, but have not been demonstrated so far for submicron pore sizes. Herein, the use of soft, flexible microgel colloids decorated with silica nanoparticles as templates of macroporous foams is reported. These purposely synthesized core-shell colloids are assembled at ultra-high effective volume fractions by centrifuging and thermal swelling, thereby resulting in uniform disordered materials with facetted pores, mimicking dry foams. After removal of the polymer component via calcination, lightweight pure silica structures are obtained with a well-defined cellular or network topology.
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Affiliation(s)
- Maxime J Bergman
- Department of Physics and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, CH-1700, Fribourg, Switzerland
| | - Clara García-Astrain
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), 20014, Donostia-San Sebastian, Spain
| | - Nathan Fuchs
- Department of Physics and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, CH-1700, Fribourg, Switzerland
| | - Kalpana Manne
- Department of Physics and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, CH-1700, Fribourg, Switzerland
| | - Pavel Yazhgur
- Department of Physics and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, CH-1700, Fribourg, Switzerland
| | - Luis S Froufe-Pérez
- Department of Physics and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, CH-1700, Fribourg, Switzerland
| | - Luis M Liz-Marzán
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), 20014, Donostia-San Sebastian, Spain
- Ikerbasque, Basque Foundation for Science, 43009, Bilbao, Spain
| | - Frank Scheffold
- Department of Physics and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, CH-1700, Fribourg, Switzerland
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9
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Höfken T, Strauch C, Schneider S, Scotti A. Changes in the Form Factor and Size Distribution of Nanogels in Crowded Environments. NANO LETTERS 2022; 22:2412-2418. [PMID: 35258981 DOI: 10.1021/acs.nanolett.2c00120] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Particle size disparities suppress crystallization. However, soft deformable nanogels can change the size of the larger particles in suspension and crystallize even at a high initial size-polydispersity. Using neutron scattering with contrast variation, the response of individual nanogels in crowded environments was probed, and an increase of the parameter describing size-polydispersity was found, which is often interpreted as deformation. Here, computer simulations are used to generate deformed nanogels and the corresponding form factor. The data are fitted with the spherical model used to analyze scattering data. The fits show the same qualitative increase of the parameter related to the size-polydispersity with increasing particle deformation. Starting from the simulated deformed spheres, we also reproduce experimental scattering data. A further analysis of the particle shows that the size disparities between nanogels do not increase significantly. In contrast, their shapes strongly vary from one nanogel to the other.
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Affiliation(s)
- Tom Höfken
- Institute of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
| | - Christian Strauch
- Institute of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
| | - Stefanie Schneider
- Institute of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
| | - Andrea Scotti
- Institute of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
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10
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Yasmeen N, Kalecki J, Borowicz P, Kutner W, Sharma PS. Electrochemically Initiated Synthesis of Polyacrylamide Microgels and Core-shell Particles. ACS APPLIED POLYMER MATERIALS 2022; 4:452-462. [PMID: 35059644 PMCID: PMC8762648 DOI: 10.1021/acsapm.1c01359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Accepted: 12/20/2021] [Indexed: 05/20/2023]
Abstract
Herein, we developed a simple procedure for synthesizing micrometer-sized microgel particles as a suspension in an aqueous solution and thin films deposited as shells on different inorganic cores. A sufficiently high constant potential was applied to the working electrode to commence the initiator decomposition that resulted in gelation. Under hydrodynamic conditions, this initiation allowed preparing different morphology microgels at room temperature. Importantly, neither heating nor UV-light illumination was needed to initiate the polymerization. Moreover, thin films of the cross-linked gel were anchored on different core substrates, including silica and magnetic nanoparticles. Scanning electron microscopy and transmission electron microscopy imaging confirmed the microgel particles' and films' irregular shape and porous structure. Energy-dispersive X-ray spectroscopy indicated that the core coating with the microgel film was successful. Dynamic light scattering measured the micrometer size of gel particles with different combinations of acrylic monomers. Thermogravimetric analysis and the first-derivative thermogravimetric analysis revealed that the microgels' thermal stability of different compositions was different. Fourier-transform infrared and 13C NMR spectroscopy showed successful copolymerization of the main, functional, and cross-linking monomers.
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Affiliation(s)
- Nabila Yasmeen
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Jakub Kalecki
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Pawel Borowicz
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Wlodzimierz Kutner
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
- Faculty
of Mathematics and Natural Sciences, School of Sciences, Cardinal Stefan Wyszynski University in Warsaw, Wóycickiego 1/3, 01-938 Warsaw, Poland
| | - Piyush S. Sharma
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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11
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Kunene SC, Lin KS, Weng MT, Carrera Espinoza MJ, Wu CM. In vitro study of doxorubicin-loaded thermo- and pH-tunable carriers for targeted drug delivery to liver cancer cells. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.08.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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12
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Dang S, Brady J, Rel R, Surineni S, O'Shaughnessy C, McGorty R. Core-shell droplets and microcapsules formed through liquid-liquid phase separation of a colloid-polymer mixture. SOFT MATTER 2021; 17:8300-8307. [PMID: 34550150 DOI: 10.1039/d1sm01091c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Microcapsules allow for the controlled containment, transport, and release of cargoes ranging from pharmaceuticals to fragrances. Given the interest from a variety of industries in microcapsules and other core-shell structures, a multitude of fabrication strategies exist. Here, we report on a method relying on a mixture of temperature-responsive microgel particles, poly(N-isopropylacrylamide) (pNIPAM), and a polymer which undergo fluid-fluid phase separation. At room temperature this mixture separates into colloid-rich (liquid) and colloid-poor (gas) fluids. By heating the sample above a critical temperature where the microgel particles shrink dramatically and develop a more deeply attractive interparticle potential, the droplets of the colloid-rich phase become gel-like. As the temperature is lowered back to room temperature, these droplets of gelled colloidal particles reliquefy and phase separation within the droplet occurs. This phase separation leads to colloid-poor droplets within the colloid-rich droplets surrounded by a continuous colloid-poor phase. The gas/liquid/gas all-aqueous double emulsion lasts only a few minutes before a majority of the inner droplets escape. However, the colloid-rich shell of the core-shell droplets can solidify with the addition of salt. That this method creates core-shell structures with a shell composed of stimuli-sensitive microgel colloidal particles using only aqueous components makes it attractive for encapsulating biological materials and making capsules that respond to changes in, for example, temperature, salt concentration, or pH.
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Affiliation(s)
- Steven Dang
- Department of Physics and Biophysics, University of San Diego, San Diego, CA, 92110, USA.
| | - John Brady
- Department of Physics and Biophysics, University of San Diego, San Diego, CA, 92110, USA.
| | - Ryle Rel
- Department of Physics and Biophysics, University of San Diego, San Diego, CA, 92110, USA.
| | - Sreenidhi Surineni
- Department of Physics and Biophysics, University of San Diego, San Diego, CA, 92110, USA.
| | - Conor O'Shaughnessy
- Department of Physics and Biophysics, University of San Diego, San Diego, CA, 92110, USA.
| | - Ryan McGorty
- Department of Physics and Biophysics, University of San Diego, San Diego, CA, 92110, USA.
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Vialetto J, Camerin F, Grillo F, Ramakrishna SN, Rovigatti L, Zaccarelli E, Isa L. Effect of Internal Architecture on the Assembly of Soft Particles at Fluid Interfaces. ACS NANO 2021; 15:13105-13117. [PMID: 34328717 PMCID: PMC8388124 DOI: 10.1021/acsnano.1c02486] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Monolayers of soft colloidal particles confined at fluid interfaces are at the core of a broad range of technological processes, from the stabilization of responsive foams and emulsions to advanced lithographic techniques. However, establishing a fundamental relation between their internal architecture, which is controlled during synthesis, and their structural and mechanical properties upon interfacial confinement remains an elusive task. To address this open issue, which defines the monolayer's properties, we synthesize core-shell microgels, whose soft core can be chemically degraded in a controlled fashion. This strategy allows us to obtain a series of particles ranging from analogues of standard batch-synthesized microgels to completely hollow ones after total core removal. Combined experimental and numerical results show that our hollow particles have a thin and deformable shell, leading to a temperature-responsive collapse of the internal cavity and a complete flattening after adsorption at a fluid interface. Mechanical characterization shows that a critical degree of core removal is required to obtain soft disk-like particles at an oil-water interface, which present a distinct response to compression. At low packing fractions, the mechanical response of the monolayer is dominated by the outer polymer chains forming a corona surrounding the particles within the interfacial plane, regardless of the presence of a core. By contrast, at high compression, the absence of a core enables the particles to deform in the direction orthogonal to the interface and to be continuously compressed without altering the monolayer structure. These findings show how fine, single-particle architectural control during synthesis can be engineered to determine the interfacial behavior of microgels, enabling one to link particle conformation with the resulting material properties.
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Affiliation(s)
- Jacopo Vialetto
- Laboratory
for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Fabrizio Camerin
- CNR
Institute for Complex Systems, Uos Sapienza, P.le A. Moro 2, 00185 Roma, Italy
- Department
of Basic and Applied Sciences for Engineering, Sapienza University of Rome, via A. Scarpa 14, 00161 Roma, Italy
| | - Fabio Grillo
- Laboratory
for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Shivaprakash N. Ramakrishna
- Laboratory
for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Lorenzo Rovigatti
- CNR
Institute for Complex Systems, Uos Sapienza, P.le A. Moro 2, 00185 Roma, Italy
- Department
of Physics, Sapienza University of Rome, P.le A. Moro 2, 00185 Roma, Italy
| | - Emanuela Zaccarelli
- CNR
Institute for Complex Systems, Uos Sapienza, P.le A. Moro 2, 00185 Roma, Italy
- Department
of Physics, Sapienza University of Rome, P.le A. Moro 2, 00185 Roma, Italy
| | - Lucio Isa
- Laboratory
for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
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14
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Goujard S, Suau JM, Chaub A, Guigner JM, Bizien T, Cloitre M. Glassy states in adsorbing surfactant-microgel soft nanocomposites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:404003. [PMID: 34237714 DOI: 10.1088/1361-648x/ac1282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Mixtures of polymer-colloid hybrids such as star polymers and microgels with non-adsorbing polymeric additives have received a lot of attention. In these materials, the interplay between entropic forces and softness is responsible for a wealth of phenomena. By contrast, binary mixtures where one component can adsorb onto the other one have been far less studied. Yet real formulations in applications often contain low molecular weight additives that can adsorb onto soft colloids. Here we study the microstructure and rheology of soft nanocomposites made of surfactants and microgels using linear and nonlinear rheology, SAXS experiments, and cryo-TEM techniques. The results are used to build a dynamical state diagram encompassing various liquid, glassy, jammed, metastable, and reentrant liquid states, which results from a subtle interplay between enthalpic, entropic, and kinetic effects. We rationalize the rheological properties of the nanocomposites in each domain of the state diagram, thus providing exquisite solutions for designing new rheology modifiers at will.
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Affiliation(s)
- Sarah Goujard
- Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, CNRS, PSL University, 10 Rue Vauquelin, 75005 Paris, France
| | | | - Arnaud Chaub
- Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, CNRS, PSL University, 10 Rue Vauquelin, 75005 Paris, France
| | - Jean-Michel Guigner
- Sorbonne Université, CNRS, UMR 7590 Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC)-IRD-MNHN, 75005 Paris, France
| | - Thomas Bizien
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, Gif-sur-Yvette 91190, France
| | - Michel Cloitre
- Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, CNRS, PSL University, 10 Rue Vauquelin, 75005 Paris, France
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15
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Ciarella S, Rey M, Harrer J, Holstein N, Ickler M, Löwen H, Vogel N, Janssen LMC. Soft Particles at Liquid Interfaces: From Molecular Particle Architecture to Collective Phase Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5364-5375. [PMID: 33886318 DOI: 10.1021/acs.langmuir.1c00541] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Soft particles such as microgels can undergo significant and anisotropic deformations when adsorbed to a liquid interface. This, in turn, leads to a complex phase behavior upon compression. To date, experimental efforts have predominantly provided phenomenological links between microgel structure and resulting interfacial behavior, while simulations have not been entirely successful in reproducing experiments or predicting the minimal requirements for the desired phase behavior. Here, we develop a multiscale framework to link the molecular particle architecture to the resulting interfacial morphology and, ultimately, to the collective interfacial phase behavior. To this end, we investigate interfacial morphologies of different poly(N-isopropylacrylamide) particle systems using phase-contrast atomic force microscopy and correlate the distinct interfacial morphology with their bulk molecular architecture. We subsequently introduce a new coarse-grained simulation method that uses augmented potentials to translate this interfacial morphology into the resulting phase behavior upon compression. The main novelty of this method is the possibility to efficiently encode multibody interactions, the effects of which are key to distinguishing between heterostructural (anisotropic collapse) and isostructural (isotropic collapse) phase transitions. Our approach allows us to qualitatively resolve existing discrepancies between experiments and simulations. Notably, we demonstrate the first in silico account of the two-dimensional isostructural transition, which is frequently found in experiments but elusive in simulations. In addition, we provide the first experimental demonstration of a heterostructural transition to a chain phase in a single-component system, which has been theoretically predicted decades ago. Overall, our multiscale framework provides a phenomenological bridge between physicochemical soft-particle characteristics at the molecular scale and nanoscale and the collective self-assembly phenomenology at the macroscale, serving as a stepping stone toward an ultimately more quantitative and predictive design approach.
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Affiliation(s)
- Simone Ciarella
- Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Marcel Rey
- Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - Johannes Harrer
- Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - Nicolas Holstein
- Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - Maret Ickler
- Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - Hartmut Löwen
- Institute for Theoretical Physics II: Soft Matter, Heinrich-Heine University Düsseldorf, D-40225 Düsseldorf, Germany
| | - Nicolas Vogel
- Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - Liesbeth M C Janssen
- Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
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16
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Budiarta M, Xu W, Schubert L, Meledina M, Meledin A, Wöll D, Pich A, Beck T. Protecting redesigned supercharged ferritin containers against protease by integration into acid-cleavable polyelectrolyte microgels. J Colloid Interface Sci 2021; 591:451-462. [PMID: 33631532 DOI: 10.1016/j.jcis.2021.01.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 01/21/2021] [Accepted: 01/22/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS The application of ferritin containers as a promising drug delivery vehicle is limited by their low bioavailability in blood circulation due to unfavorable environments, such as degradation by protease. The integration of ferritin containers into the polymeric network of microgels through electrostatic interactions is expected to be able to protect ferritin against degradation by protease. Furthermore, a stimuli-responsive microgel system can be designed by employing an acid-degradable crosslinker during the microgel synthesis. This should enable ferritin release in an acidic environment, which will be useful for future drug delivery applications. EXPERIMENTS Nanoparticle/fluorophores-loaded ferritin was integrated into microgels during precipitation polymerization. The integration was monitored by transmission electron microscopy (TEM)2 and fluorescence microscopy, respectively. After studying ferritin release in acidic solutions, we investigated the stability of ferritin inside microgels against degradation by chymotrypsin. FINDINGS About 80% of the applied ferritin containers were integrated into microgels and around 85% and 50% of them could be released in buffer pH 2.5 and 4.0, respectively. Total degradation of the microgels was not achieved due to the self-crosslinking of N-isopropylacrylamide (NIPAM). Finally, we prove that microgels could protect ferritin against degradation by chymotrypsin at 37 °C.
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Affiliation(s)
- Made Budiarta
- RWTH Aachen University, Institute of Inorganic Chemistry, Landoltweg 1, 52074 Aachen, Germany.
| | - Wenjing Xu
- DWI- Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, 52074 Aachen, Germany; RWTH Aachen University, Institute of Technical and Molecular Chemistry, Woringer Weg 2, 52074 Aachen, Germany.
| | - Lukas Schubert
- RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany.
| | - Maria Meledina
- RWTH Aachen University, Central Facility for Electron Microscopy, Ahornstraße 55, Aachen 52074, Germany.
| | - Alexander Meledin
- RWTH Aachen University, Central Facility for Electron Microscopy, Ahornstraße 55, Aachen 52074, Germany.
| | - Dominik Wöll
- RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany.
| | - Andrij Pich
- DWI- Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, 52074 Aachen, Germany; RWTH Aachen University, Institute of Technical and Molecular Chemistry, Woringer Weg 2, 52074 Aachen, Germany; Maastricht University, Aachen Maastricht Institute for Biobased Materials, Urmonderbaan 22, 6167 RD, Geleen, the Netherlands.
| | - Tobias Beck
- Universität Hamburg, Department of Chemistry, Institute of Physical Chemistry, Grindelallee 117, 20146 Hamburg, Germany; The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany.
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17
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Scheffold F. Pathways and challenges towards a complete characterization of microgels. Nat Commun 2020; 11:4315. [PMID: 32887886 PMCID: PMC7473851 DOI: 10.1038/s41467-020-17774-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Accepted: 07/20/2020] [Indexed: 01/07/2023] Open
Abstract
Due to their controlled size, sensitivity to external stimuli, and ease-of-use, microgel colloids are unique building blocks for soft materials made by crosslinking polymers on the micrometer scale. Despite the plethora of work published, many questions about their internal structure, interactions, and phase behavior are still open. The reasons for this lack of understanding are the challenges arising from the small size of the microgel particles, complex pairwise interactions, and their solvent permeability. Here we describe pathways toward a complete understanding of microgel colloids based on recent experimental advances in nanoscale characterization, such as super-resolution microscopy, scattering methods, and modeling.
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Affiliation(s)
- Frank Scheffold
- Department of Physics, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland.
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18
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Zanatta M, Tavagnacco L, Buratti E, Chiessi E, Natali F, Bertoldo M, Orecchini A, Zaccarelli E. Atomic scale investigation of the volume phase transition in concentrated PNIPAM microgels. J Chem Phys 2020; 152:204904. [PMID: 32486676 DOI: 10.1063/5.0007112] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Combining elastic incoherent neutron scattering and differential scanning calorimetry, we investigate the occurrence of the volume phase transition (VPT) in very concentrated poly-(N-isopropyl-acrylamide) (PNIPAM) microgel suspensions, from a polymer weight fraction of 30 wt. % up to dry conditions. Although samples are arrested at the macroscopic scale, atomic degrees of freedom are equilibrated and can be probed in a reproducible way. A clear signature of the VPT is present as a sharp drop in the mean square displacement of PNIPAM hydrogen atoms obtained by neutron scattering. As a function of concentration, the VPT gets smoother as dry conditions are approached, whereas the VPT temperature shows a minimum at about 43 wt. %. This behavior is qualitatively confirmed by calorimetry measurements. Molecular dynamics simulations are employed to complement experimental results and gain further insights into the nature of the VPT, confirming that it involves the formation of an attractive gel state between the microgels. Overall, these results provide evidence that the VPT in PNIPAM-based systems can be detected at different time- and length-scales as well as under overcrowded conditions.
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Affiliation(s)
- M Zanatta
- Department of Physics, University of Trento, I-38123 Trento, Italy
| | - L Tavagnacco
- CNR-ISC and Department of Physics, Sapienza University of Rome, I-00185 Roma, Italy
| | - E Buratti
- CNR-ISC and Department of Physics, Sapienza University of Rome, I-00185 Roma, Italy
| | - E Chiessi
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, I-00133 Roma, Italy
| | - F Natali
- CNR-IOM, Operative Group in Grenoble (OGG), c/o Institut Laue Langevin, F-38042 Grenoble, France
| | - M Bertoldo
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, I-44121 Ferrara, Italy
| | - A Orecchini
- Department of Physics and Geology, University of Perugia, I-06123 Perugia, Italy
| | - E Zaccarelli
- CNR-ISC and Department of Physics, Sapienza University of Rome, I-00185 Roma, Italy
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19
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Bergman MJ, Pedersen JS, Schurtenberger P, Boon N. Controlling the morphology of microgels by ionic stimuli. SOFT MATTER 2020; 16:2786-2794. [PMID: 32104825 DOI: 10.1039/c9sm02170a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Stimuli-responsive microgels have attracted much interest for their use as vehicles for drug delivery or as the building blocks of adaptive materials. Ionic microgel particles, including popular poly(NIPAM-co-acrylic acid), show strong mechanical responsiveness to many external stimuli, including changes in ionic strength or acidity. In this work, we demonstrate that combining multiple ionic stimuli can enable detailed control over the morphology of microgels. To this extent, we analyze the particle morphology in various surroundings with light-scattering techniques. First, we find strong indications of an inverted density profile in the core of the particles. Secondly, we show that the swelling of this hydrogel core and the corona of dangling polymer ends can be targeted separately by a combination of deionization and deprotonation steps. Hence, this work represents an advance in tailoring particle morphologies after synthesis in a predictable fashion.
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Affiliation(s)
- Maxime J Bergman
- Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden.
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20
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Rey M, Fernandez-Rodriguez MA, Karg M, Isa L, Vogel N. Poly- N-isopropylacrylamide Nanogels and Microgels at Fluid Interfaces. Acc Chem Res 2020; 53:414-424. [PMID: 31940173 DOI: 10.1021/acs.accounts.9b00528] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The confinement of colloidal particles at liquid interfaces offers many opportunities for materials design. Adsorption is driven by a reduction of the total free energy as the contact area between the two liquids is partially replaced by the particle. From an application point of view, particle-stabilized interfaces form emulsions and foams with superior stability. Liquid interfaces also effectively confine colloidal particles in two dimensions and therefore provide ideal model systems to fundamentally study particle interactions, dynamics, and self-assembly. With progress in the synthesis of nanomaterials, more and more complex and functional particles are available for such studies. In this Account, we focus on poly(N-isopropylacrylamide) nanogels and microgels. These are cross-linked polymeric particles that swell and soften by uptaking large amounts of water. The incorporated water can be partially expelled, causing a volume phase transition into a collapsed state when the temperature is increased above approximately 32 °C. Soft microgels adsorbed to liquid interfaces significantly deform under the influence of interfacial tension and assume cross sections exceeding their bulk dimensions. In particular, a pronounced corona forms around the microgel core, consisting of dangling chains at the microgel periphery. These polymer chains expand at the interface and strongly affect the interparticle interactions. The particle deformability therefore leads to a significantly more complex interfacial phase behavior that provides a rich playground to explore structure formation processes. We first discuss the characteristic "fried-egg" or core-corona morphology of individual microgels adsorbed to a liquid interface and comment on the dependence of this interfacial morphology on their physicochemical properties. We introduce different theoretical models to describe their interfacial morphology. In a second part, we introduce how ensembles of microgels interact and self-assemble at liquid interfaces. The core-corona morphology and the possibility to force these elements into overlap upon compression results in a complex phase behavior with a phase transition between microgels with extended and collapsed coronae. We discuss the influence of the internal particle architecture, also including core-shell microgels with rigid cores, on the phase behavior. Finally, we present new routes for the realization of more complex structures, resulting from multiple deposition protocols and from engineering the interaction potential of the individual particles.
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Affiliation(s)
- Marcel Rey
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander University Erlangen-Nürnberg, Haberstrasse 9a, 91058 Erlangen, Germany
| | - Miguel Angel Fernandez-Rodriguez
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Matthias Karg
- Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
| | - Lucio Isa
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Nicolas Vogel
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander University Erlangen-Nürnberg, Haberstrasse 9a, 91058 Erlangen, Germany
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21
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Synthesis optimization and characterization of high molecular weight polymeric nanoparticles as EOR agent for harsh condition reservoirs. JOURNAL OF POLYMER RESEARCH 2020. [DOI: 10.1007/s10965-020-2017-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Affiliation(s)
- Kenechi A. Agbim
- Department of Mechanical Engineering, Rice University, Houston, Texas, USA
| | - Laura A. Schaefer
- Department of Mechanical Engineering, Rice University, Houston, Texas, USA
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23
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How small can poly(N-isopropylacrylamide) nanogels be prepared by controlling the size with surfactant? J Colloid Interface Sci 2019; 557:793-806. [DOI: 10.1016/j.jcis.2019.09.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/14/2019] [Accepted: 09/16/2019] [Indexed: 11/20/2022]
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24
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Synthesis and characterization of poly(N-isopropylacrylamide-co-N,N′-methylenebisacrylamide-co-acrylamide) core – Silica shell nanoparticles by using reactive surfactant polyoxyethylene alkylphenyl ether ammonium sulfate. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109263] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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25
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Wang J, McGorty R. Measuring capillary wave dynamics using differential dynamic microscopy. SOFT MATTER 2019; 15:7412-7419. [PMID: 31465080 DOI: 10.1039/c9sm01508f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The interface between two fluids is roughened by thermally excited capillary waves. By using colloid-polymer systems which exhibit liquid-gas phase separation, the time and length scales of capillary waves become accessible to optical microscopy methods. Here, we study such a system using bright-field optical microscopy combined with a novel extension of differential dynamic microscopy. With differential dynamic microscopy, we analyze images in order to determine the decay time of interfacial fluctuations spanning wavevectors from 0.1 to 1 μm-1. We find capillary velocities on the order of 0.1 μm s-1 that depend on the sample composition in expected ways and that match values from the literature. This work demonstrates the first application of differential dynamic microscopy to the study of interfacial dynamics.
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Affiliation(s)
- Jing Wang
- Department of Physics and Biophysics, University of San Diego, San Diego, CA 92110, USA.
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26
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Kyrey T, Witte J, Feoktystov A, Pipich V, Wu B, Pasini S, Radulescu A, Witt MU, Kruteva M, von Klitzing R, Wellert S, Holderer O. Inner structure and dynamics of microgels with low and medium crosslinker content prepared via surfactant-free precipitation polymerization and continuous monomer feeding approach. SOFT MATTER 2019; 15:6536-6546. [PMID: 31355828 DOI: 10.1039/c9sm01161g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The preparation of poly(N-isopropylacrylamide) microgels via classical precipitation polymerization (batch method) and a continuous monomer feeding approach (feeding method) leads to different internal crosslinker distributions, i.e., from core-shell-like to a more homogeneous one. The internal structure and dynamics of these microgels with low and medium crosslinker concentrations are studied with dynamic light scattering and small-angle neutron scattering in a wide q-range below and above the volume phase transition temperature. The influence of the preparation method, and crosslinker and initiator concentration on the internal structure of the microgels is investigated. In contrast to the classical conception where polymer microgels possess a core-shell structure with the averaged internal polymer density distribution within the core part, a detailed view of the internal inhomogeneities of the PNIPAM microgels and the presence of internal domains even above the volume phase transition temperature, when polymer microgels are in the deswollen state, are presented. The correlation between initiator concentration and the size of internal domains that appear inside the microgel with temperature increase is demonstrated. Moreover, the influence of internal inhomogeneities on the dynamics of the batch- and feeding-microgels studied with neutron spin-echo spectroscopy is reported.
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Affiliation(s)
- Tetyana Kyrey
- Institute of Chemistry, TU Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany. and Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany and Department of Physics, Soft Matter at Interfaces, Technical University Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
| | - Judith Witte
- Institute of Chemistry, TU Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany.
| | - Artem Feoktystov
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Vitaliy Pipich
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Baohu Wu
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Stefano Pasini
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Aurel Radulescu
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Marcus U Witt
- Department of Physics, Soft Matter at Interfaces, Technical University Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
| | - Margarita Kruteva
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Regine von Klitzing
- Department of Physics, Soft Matter at Interfaces, Technical University Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
| | - Stefan Wellert
- Institute of Chemistry, TU Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany.
| | - Olaf Holderer
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentzum (MLZ), Lichtenbergstrasse 1, 85747 Garching, Germany
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27
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Conley GM, Zhang C, Aebischer P, Harden JL, Scheffold F. Relationship between rheology and structure of interpenetrating, deforming and compressing microgels. Nat Commun 2019; 10:2436. [PMID: 31164639 PMCID: PMC6547648 DOI: 10.1038/s41467-019-10181-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2018] [Accepted: 04/23/2019] [Indexed: 11/30/2022] Open
Abstract
Thermosensitive microgels are widely studied hybrid systems combining properties of polymers and colloidal particles in a unique way. Due to their complex morphology, their interactions and packing, and consequentially the viscoelasticity of suspensions made from microgels, are still not fully understood, in particular under dense packing conditions. Here we study the frequency-dependent linear viscoelastic properties of dense suspensions of micron sized soft particles in conjunction with an analysis of the local particle structure and morphology based on superresolution microscopy. By identifying the dominating mechanisms that control the elastic and dissipative response, we can explain the rheology of these widely studied soft particle assemblies from the onset of elasticity deep into the overpacked regime. Interestingly, our results suggest that the friction between the microgels is reduced due to lubrification mediated by the polymer brush-like corona before the onset of interpenetration.
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Affiliation(s)
- Gaurasundar M Conley
- Department of Physics, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
| | - Chi Zhang
- Department of Physics, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
| | - Philippe Aebischer
- Department of Physics, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
| | - James L Harden
- Department of Physics, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Frank Scheffold
- Department of Physics, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland.
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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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29
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Aguirre G, Deniau E, Brûlet A, Chougrani K, Alard V, Billon L. Versatile oligo(ethylene glycol)-based biocompatible microgels for loading/release of active bio(macro)molecules. Colloids Surf B Biointerfaces 2019; 175:445-453. [PMID: 30572152 DOI: 10.1016/j.colsurfb.2018.12.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 11/17/2018] [Accepted: 12/10/2018] [Indexed: 12/15/2022]
Abstract
The present study aims in the understanding of the effect of oligo(ethylene glycol)-based biocompatible microgels inner structure on the encapsulation/release mechanisms of different types of cosmetic active molecules. For that, multi-responsive microgels were synthesized using three types of cross-linkers: ethylene glycol dimethacrylate (EGDMA), oligo(ethylene glycol) diacrylate (OEGDA) and N,N-methylenebisacrylamide (MBA). The inner morphology of the microgels synthesized was studied by 1H-nuclear magnetic resonance (1H NMR) and small-angle neutron scattering (SANS) techniques and no effect of cross-linker type on microgel microstructure was observed in the case of analysing purified microgel dispersions. Moreover, all the microgels synthesized presented conventional swelling/de-swelling behavior as a function of temperature and pH. Two hydrophobic, one hydrophilic, and one macromolecule as cosmetic active molecules were effectively loaded into different microgel particles via hydrophobic interactions and hydrogen-bonding interactions between -OH groups of active molecules and ether oxygens of different microgel particles. Their release profiles as a function of cross-linker type used and encapsulated amounts were studied by Peppas-Sahlin model. No effect of the cross-linker type was observed due to the similar inner structure of all the microgels synthesized.
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Affiliation(s)
- Garbine Aguirre
- Université de Pau & Pays Adour, CNRS, IPREM UMR 5254, Equipe de Physique et Chimie des Polymères, 2 avenue du Président Angot, Pau F-64053, France; Bio-inspired Materials Group: Functionality & Self-assembly, Université de Pau & Pays Adour, 2 avenue du Président Angot, Pau F-64053, France
| | - Elise Deniau
- Université de Pau & Pays Adour, CNRS, IPREM UMR 5254, Equipe de Physique et Chimie des Polymères, 2 avenue du Président Angot, Pau F-64053, France
| | - Annie Brûlet
- UMR12 CEA CNRS CEA Saclay, Laboratoire Léon Brillouin, F-91191 Gif Sur Yvette, France
| | - Kamel Chougrani
- LVMH Recherche Parfums et Cosmétiques, 185 Av. De Verdun, St Jean de Braye F-45804, France
| | - Valérie Alard
- LVMH Recherche Parfums et Cosmétiques, 185 Av. De Verdun, St Jean de Braye F-45804, France
| | - Laurent Billon
- Université de Pau & Pays Adour, CNRS, IPREM UMR 5254, Equipe de Physique et Chimie des Polymères, 2 avenue du Président Angot, Pau F-64053, France; Bio-inspired Materials Group: Functionality & Self-assembly, Université de Pau & Pays Adour, 2 avenue du Président Angot, Pau F-64053, France.
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30
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Virtanen OLJ, Kather M, Meyer-Kirschner J, Melle A, Radulescu A, Viell J, Mitsos A, Pich A, Richtering W. Direct Monitoring of Microgel Formation during Precipitation Polymerization of N-Isopropylacrylamide Using in Situ SANS. ACS OMEGA 2019; 4:3690-3699. [PMID: 31459582 PMCID: PMC6648459 DOI: 10.1021/acsomega.8b03461] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 02/04/2019] [Indexed: 05/20/2023]
Abstract
Poly(N-isopropylacrylamide) microgels have found various uses in fundamental polymer and colloid science as well as in different applications. They are conveniently prepared by precipitation polymerization. In this reaction, radical polymerization and colloidal stabilization interact with each other to produce well-defined thermosensitive particles of narrow size distribution. However, the underlying mechanism of precipitation polymerization has not been fully understood. In particular, the crucial early stages of microgel formation have been poorly investigated so far. In this contribution, we have used small-angle neutron scattering in conjunction with a stopped-flow device to monitor the particle growth during precipitation polymerization in situ. The average particle volume growth is found to follow pseudo-first order kinetics, indicating that the polymerization rate is determined by the availability of the unreacted monomer, as the initiator concentration does not change considerably during the reaction. This is confirmed by calorimetric investigation of the polymerization process. Peroxide initiator-induced self-crosslinking of N-isopropylacrylamide and the use of the bifunctional crosslinker N,N'-methylenebisacrylamide are shown to decrease the particle number density in the batch. The results of the in situ small-angle neutron scattering measurements indicate that the particles form at an early stage in the reaction and their number density remains approximately the same thereafter. The overall reaction rate is found to be sensitive to monomer and initiator concentration in accordance with a radical solution polymerization mechanism, supporting the results from our earlier studies.
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Affiliation(s)
- Otto L. J. Virtanen
- Institute of Physical
Chemistry, RWTH Aachen University, Landoltweg 2, 52064 Aachen, Germany
| | - Michael Kather
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany
- DWI—Leibniz-Institute for Interactive
Materials, RWTH Aachen University, Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Julian Meyer-Kirschner
- Aachener Verfahrenstechnik
- Process Systems Engineering, RWTH Aachen
University, Forckenbeckstr.
51, 52074 Aachen, Germany
| | - Andrea Melle
- Institute of Physical
Chemistry, RWTH Aachen University, Landoltweg 2, 52064 Aachen, Germany
- DWI—Leibniz-Institute for Interactive
Materials, RWTH Aachen University, Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Aurel Radulescu
- Juelich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz
Zentrum (MLZ), Forschungszentrum Juelich
GmbH, Lichtenbergstr.
1, 85748 Garching, Germany
| | - Jörn Viell
- Aachener Verfahrenstechnik
- Process Systems Engineering, RWTH Aachen
University, Forckenbeckstr.
51, 52074 Aachen, Germany
| | - Alexander Mitsos
- Aachener Verfahrenstechnik
- Process Systems Engineering, RWTH Aachen
University, Forckenbeckstr.
51, 52074 Aachen, Germany
| | - Andrij Pich
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany
- DWI—Leibniz-Institute for Interactive
Materials, RWTH Aachen University, Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Walter Richtering
- Institute of Physical
Chemistry, RWTH Aachen University, Landoltweg 2, 52064 Aachen, Germany
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31
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Cao-Luu NH, Pham QT, Yao ZH, Wang FM, Chern CS. Synthesis and characterization of poly(N-isopropylacrylamide-co-acrylamide) mesoglobule core–silica shell nanoparticles. J Colloid Interface Sci 2019; 536:536-547. [DOI: 10.1016/j.jcis.2018.10.091] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/26/2018] [Accepted: 10/27/2018] [Indexed: 01/25/2023]
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32
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Witte J, Kyrey T, Lutzki J, Dahl AM, Houston J, Radulescu A, Pipich V, Stingaciu L, Kühnhammer M, Witt MU, von Klitzing R, Holderer O, Wellert S. A comparison of the network structure and inner dynamics of homogeneously and heterogeneously crosslinked PNIPAM microgels with high crosslinker content. SOFT MATTER 2019; 15:1053-1064. [PMID: 30663759 DOI: 10.1039/c8sm02141d] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Poly(N-isopropylacrylamide) microgel particles were prepared via a "classical" surfactant-free precipitation polymerization and a continuous monomer feeding approach. It is anticipated that this yields microgel particles with different internal structures, namely a dense core with a fluffy shell for the classical approach and a more even crosslink distribution in the case of the continuous monomer feeding approach. A thorough structural investigation of the resulting microgels with dynamic light scattering, atomic force microscopy and small angle neutron scattering was conducted and related to neutron spin echo spectroscopy data. In this way a link between structural and dynamic features of the internal polymer network was made.
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Affiliation(s)
- Judith Witte
- Institute of Chemistry, TU Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany.
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33
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Ma X, Davidson ZS, Still T, Ivancic RJS, Schoenholz SS, Liu AJ, Yodh AG. Heterogeneous Activation, Local Structure, and Softness in Supercooled Colloidal Liquids. PHYSICAL REVIEW LETTERS 2019; 122:028001. [PMID: 30720295 DOI: 10.1103/physrevlett.122.028001] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Revised: 08/08/2018] [Indexed: 06/09/2023]
Abstract
We experimentally characterize heterogeneous nonexponential relaxation in bidisperse supercooled colloidal liquids utilizing a recent concept called "softness" [Phys. Rev. Lett. 114, 108001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.108001]. Particle trajectory and structure data enable classification of particles into subgroups with different local environments and propensities to hop. We determine residence times t_{R} between particle hops and show that t_{R} derived from particles in the same softness subgroup are exponentially distributed. Using the mean residence time t[over ¯]_{R} for each softness subgroup, and a Kramers' reaction rate model, we estimate the activation energy barriers E_{b} for particle hops, and show that both t[over ¯]_{R} and E_{b} are monotonic functions of softness. Finally, we derive information about the combinations of large and small particle neighbors that determine particle softness, and we explicitly show that multiple exponential relaxation channels in the supercooled liquid give rise to its nonexponential behavior.
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Affiliation(s)
- Xiaoguang Ma
- Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Complex Assemblies of Soft Matter, CNRS-Solvay-UPenn UMI 3254, Bristol, Pennsylvania 19007-3624, USA
| | - Zoey S Davidson
- Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Tim Still
- Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Robert J S Ivancic
- Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - S S Schoenholz
- Google Brain, 1600 Amphitheatre Parkway, Mountain View, California 94043, USA
| | - A J Liu
- Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - A G Yodh
- Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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34
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Milster S, Chudoba R, Kanduč M, Dzubiella J. Cross-linker effect on solute adsorption in swollen thermoresponsive polymer networks. Phys Chem Chem Phys 2019; 21:6588-6599. [DOI: 10.1039/c8cp07601d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Molecular dynamics study on the solute adsorption to thermoresponsive polymers estimating the cross-link impact on particle partitioning in swollen hydrogels.
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Affiliation(s)
- Sebastian Milster
- Research Group for Simulations of Energy Materials
- Helmholtz-Zentrum Berlin für Materialien und Energie
- D-14109 Berlin
- Germany
- Institut für Physik
| | - Richard Chudoba
- Research Group for Simulations of Energy Materials
- Helmholtz-Zentrum Berlin für Materialien und Energie
- D-14109 Berlin
- Germany
- Institut für Physik
| | - Matej Kanduč
- Research Group for Simulations of Energy Materials
- Helmholtz-Zentrum Berlin für Materialien und Energie
- D-14109 Berlin
- Germany
- Jožef Stefan Institute
| | - Joachim Dzubiella
- Research Group for Simulations of Energy Materials
- Helmholtz-Zentrum Berlin für Materialien und Energie
- D-14109 Berlin
- Germany
- Applied Theoretical Physics – Computational Physics
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35
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Azmi NS, Kamaruddin NN, Kassim S, Harun NA. Synthesis and characterization of hydrophilic polymer nanoparticles using n-isopropylacrylamide (NIPAM) via emulsion polymerization technique. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/440/1/012008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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36
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Rivas-Barbosa R, Lázaro-Lázaro E, Mendoza-Méndez P, Still T, Piazza V, Ramírez-González PE, Medina-Noyola M, Laurati M. Different routes into the glass state for soft thermo-sensitive colloids. SOFT MATTER 2018; 14:5008-5018. [PMID: 29855653 DOI: 10.1039/c8sm00285a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report an experimental and theoretical investigation of glass formation in soft thermo-sensitive colloids following two different routes: a gradual increase of the particle number density at constant temperature and an increase of the radius in a fixed volume at constant particle number density. Confocal microscopy experiments and the non-equilibrium self-consistent generalized Langevin equation (NE-SCGLE) theory consistently show that the two routes lead to a dynamically comparable state at sufficiently long aging times. However, experiments reveal the presence of moderate but persistent structural differences. Successive cycles of radius decrease and increase lead instead to a reproducible glass state, indicating a suitable route to obtain rejuvenation without using shear fields.
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Affiliation(s)
- Rodrigo Rivas-Barbosa
- División de Ciencias e Ingenierías, Universidad de Guanajuato, Loma del Bosque 103, 37150 León, Mexico.
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37
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Cubuk ED, Ivancic RJS, Schoenholz SS, Strickland DJ, Basu A, Davidson ZS, Fontaine J, Hor JL, Huang YR, Jiang Y, Keim NC, Koshigan KD, Lefever JA, Liu T, Ma XG, Magagnosc DJ, Morrow E, Ortiz CP, Rieser JM, Shavit A, Still T, Xu Y, Zhang Y, Nordstrom KN, Arratia PE, Carpick RW, Durian DJ, Fakhraai Z, Jerolmack DJ, Lee D, Li J, Riggleman R, Turner KT, Yodh AG, Gianola DS, Liu AJ. Structure-property relationships from universal signatures of plasticity in disordered solids. Science 2018; 358:1033-1037. [PMID: 29170231 DOI: 10.1126/science.aai8830] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 03/15/2017] [Accepted: 10/18/2017] [Indexed: 11/02/2022]
Abstract
When deformed beyond their elastic limits, crystalline solids flow plastically via particle rearrangements localized around structural defects. Disordered solids also flow, but without obvious structural defects. We link structure to plasticity in disordered solids via a microscopic structural quantity, "softness," designed by machine learning to be maximally predictive of rearrangements. Experimental results and computations enabled us to measure the spatial correlations and strain response of softness, as well as two measures of plasticity: the size of rearrangements and the yield strain. All four quantities maintained remarkable commonality in their values for disordered packings of objects ranging from atoms to grains, spanning seven orders of magnitude in diameter and 13 orders of magnitude in elastic modulus. These commonalities link the spatial correlations and strain response of softness to rearrangement size and yield strain, respectively.
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Affiliation(s)
- E D Cubuk
- Google Brain, Mountain View, CA 94043, USA
| | - R J S Ivancic
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - S S Schoenholz
- Google Brain, Mountain View, CA 94043, USA.,Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - D J Strickland
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - A Basu
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Z S Davidson
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - J Fontaine
- Laboratoire de Tribologie et Dynamique des Systémes, École Centrale de Lyon, CNRS UMR 5513, Université de Lyon, 69134 Ecully Cedex, France
| | - J L Hor
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Y-R Huang
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Y Jiang
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - N C Keim
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA.,Physics Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA
| | - K D Koshigan
- Laboratoire de Tribologie et Dynamique des Systémes, École Centrale de Lyon, CNRS UMR 5513, Université de Lyon, 69134 Ecully Cedex, France
| | - J A Lefever
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - T Liu
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - X-G Ma
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA.,Complex Assemblies of Soft Matter, CNRS-Solvay-UPenn UMI 3254, Bristol, PA 19007, USA
| | - D J Magagnosc
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - E Morrow
- Department of Physics, Houghton College, Houghton, NY 14744, USA
| | - C P Ortiz
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - J M Rieser
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - A Shavit
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - T Still
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Y Xu
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Y Zhang
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - K N Nordstrom
- Department of Physics, Mount Holyoke College, South Hadley, MA 01075, USA
| | - P E Arratia
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - R W Carpick
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - D J Durian
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Z Fakhraai
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - D J Jerolmack
- Department of Earth and Environmental Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Ju Li
- Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - R Riggleman
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - K T Turner
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - A G Yodh
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - D S Gianola
- Materials Department, University of California, Santa Barbara, CA 93106, USA.
| | - Andrea J Liu
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA.
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38
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Gibaud T. Filamentous phages as building blocks for reconfigurable and hierarchical self-assembly. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:493003. [PMID: 29099393 DOI: 10.1088/1361-648x/aa97f9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Filamentous bacteriophages such as fd-like viruses are monodisperse rod-like colloids that have well defined properties of diameter, length, rigidity, charge and chirality. Engineering these viruses leads to a library of colloidal rods, which can be used as building blocks for reconfigurable and hierarchical self-assembly. Their condensation in an aqueous solution with additive polymers, which act as depletants to induce attraction between the rods, leads to a myriad of fluid-like micronic structures ranging from isotropic/nematic droplets, colloid membranes, achiral membrane seeds, twisted ribbons, π-wall, pores, colloidal skyrmions, Möbius anchors, scallop membranes to membrane rafts. These structures, and the way that they shape-shift, not only shed light on the role of entropy, chiral frustration and topology in soft matter, but also mimic many structures encountered in different fields of science. On the one hand, filamentous phages being an experimental realization of colloidal hard rods, their condensation mediated by depletion interactions constitutes a blueprint for the self-assembly of rod-like particles and provides a fundamental foundation for bio- or material-oriented applications. On the other hand, the chiral properties of the viruses restrict the generalities of some results but vastly broaden the self-assembly possibilities.
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Affiliation(s)
- Thomas Gibaud
- Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
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39
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Hu Y, Pérez-Mercader J. Microfluidics Fabrication of Self-Oscillating Microgel Clusters with Tailored Temperature-Responsive Properties Using Polymersomes as "Microreactors". LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14058-14065. [PMID: 29137458 DOI: 10.1021/acs.langmuir.7b03166] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Poly(N-isopropylacrylamide)-based microgel clusters were successfully prepared using polymersomes as "microreactors", which were fabricated through microfluidics. The clusters were formed from the cross-linking reaction between ruthenium/amino group dual functionalized poly(N-isopropylacrylamide) microgels and linear poly(N-isopropylacrylamide)-r-(N-acryloxysuccinimide)-based polymer linkers under neutral pH conditions. By simply adjusting the ratio of N-isopropylacrylamide to N-acryloxysuccinimide in the polymer cross-linkers, the internal structures of the clusters can be controlled; hence, the temperature response of the clusters can be regulated. It was demonstrated that these different microgel clusters showed various degrees of chemomechanical oscillations when the clusters were exposed to a catalyst-free solution containing Belousov-Zhabotinsky reaction substrates.
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Affiliation(s)
- Yuandu Hu
- Department of Earth and Planetary Sciences, Harvard University , Cambridge, Massachusetts 02138, United States
| | - Juan Pérez-Mercader
- Department of Earth and Planetary Sciences, Harvard University , Cambridge, Massachusetts 02138, United States
- Santa Fe Institute, Santa Fe, New Mexico 87501, United States
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40
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Igwe IE, Zong Y, Yang X, Ouyang Z, Chen K. Induced Attraction between Polystyrene Colloidal Particles in a Binary Mixture with PNIPAM Colloidal Microgels. J Phys Chem B 2017; 121:5391-5395. [PMID: 28467075 DOI: 10.1021/acs.jpcb.6b12999] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate the phase behaviors of binary mixtures of polystyrene (PS) hard-sphere and poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM) soft-sphere colloidal particles as a function of temperature. As the temperature increases, apparent attractions arise between the PS particles, to the point of clustering at the highest temperature. This attractive force is found to be due to the change in pH caused by the acrylic acid co-polymerized with the temperature-sensitive PNIPAM particles, which in turn collapses the sterical stabilizing surface layers on the PS particles. Our experiments provide a new way to tune colloidal interactions with temperature for particles that are otherwise insensitive to temperature variations.
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Affiliation(s)
- Isaiah E Igwe
- Institute of Theoretical Physics, Chinese Academy of Sciences , Zhong Guan Cun East Street 55 #, P.O. Box 2735, Beijing 100190, P. R. China.,School of Physical Sciences, University of Chinese Academy of Sciences , 19A Yuquan Road, Shijingshan District, Beijing 100049, P. R. China
| | - Yiwu Zong
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese of Academy of Sciences , Beijing 100190, P. R. China
| | - Xiunan Yang
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese of Academy of Sciences , Beijing 100190, P. R. China
| | - Zhongcan Ouyang
- Institute of Theoretical Physics, Chinese Academy of Sciences , Zhong Guan Cun East Street 55 #, P.O. Box 2735, Beijing 100190, P. R. China
| | - Ke Chen
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese of Academy of Sciences , Beijing 100190, P. R. China
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41
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Microgels from microfluidic templating and photoinduced crosslinking of cinnamylidene acetic acid modified precursors. REACT FUNCT POLYM 2017. [DOI: 10.1016/j.reactfunctpolym.2016.12.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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42
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Sahle FF, Giulbudagian M, Bergueiro J, Lademann J, Calderón M. Dendritic polyglycerol and N-isopropylacrylamide based thermoresponsive nanogels as smart carriers for controlled delivery of drugs through the hair follicle. NANOSCALE 2017; 9:172-182. [PMID: 27905610 DOI: 10.1039/c6nr06435c] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanoparticles with a size of several hundred nanometers can effectively penetrate into the hair follicles and may serve as depots for controlled drug delivery. However, they can neither overcome the hair follicle barrier to reach the viable cells nor release the loaded drug adequately. On the other hand, small drug molecules cannot penetrate deep into the hair follicles. Thus, the most efficient way for drug delivery through the follicular route is to employ nanoparticles that can release the drug close to the target structure upon exposure to some external or internal stimuli. Accordingly, 100-700 nm sized thermoresponsive nanogels with a phase transition temperature of 32-37 °C were synthesized by the precipitation polymerization technique using N-isopropylacrylamide as a monomer, acrylated dendritic polyglycerol as a crosslinker, VA-044 as an initiator, and sodium dodecyl sulphate as a stabilizer. The follicular penetration of the indodicarbocyanine (IDCC) labeled nanogels into the hair follicles and the release of coumarin 6, which was loaded as a model drug, in the hair follicles were assessed ex vivo using porcine ear skin. Confocal laser scanning microscopy (CLSM) enabled independent tracking of the nanogels and the loaded dye, although it is not as precise and accurate as standard analytical methods. The results showed that, unlike smaller nanogels (<100 nm), medium and larger sized nanogels (300-500 nm) penetrated effectively into the hair follicles with penetration depths proportional to the nanogel size. The release of the loaded dye in the hair follicles increased significantly when the investigation on penetration was carried out above the cloud point temperature of the nanogels. The follicular penetration of the nanogels from the colloidal dispersion and a 2.5% hydroxyethyl cellulose gel was not significantly different.
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Affiliation(s)
- Fitsum Feleke Sahle
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195, Berlin, Germany.
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43
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Hu Y, Pérez-Mercader J. Controlled Synthesis of Uniform, Micrometer-Sized Ruthenium-Functionalized Poly(N-Isopropylacrylamide) Gel Particles and their Application to the Catalysis of the Belousov-Zhabotinsky Reaction. Macromol Rapid Commun 2016; 38. [DOI: 10.1002/marc.201600577] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 11/04/2016] [Indexed: 01/16/2023]
Affiliation(s)
- Yuandu Hu
- Department of Earth and Planetary Sciences; Harvard University; Cambridge MA 02142 USA
| | - Juan Pérez-Mercader
- Department of Earth and Planetary Sciences; Harvard University; Cambridge MA 02142 USA
- Santa Fe Institute; Santa Fe NM 87501 USA
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44
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Affiliation(s)
- Alan R. Denton
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
| | - Qiyun Tang
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
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45
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Cui Z, Wang W, Obeng M, Chen M, Wu S, Kinloch I, Saunders BR. Using intra-microgel crosslinking to control the mechanical properties of doubly crosslinked microgels. SOFT MATTER 2016; 12:6985-94. [PMID: 27476758 DOI: 10.1039/c6sm01337f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Microgels (MGs) are crosslinked polymer particles that swell when the pH approaches the pKa of the constituent polymer. Our earlier work showed that concentrated MG dispersions can be covalently interlinked to form macroscopic hydrogels, which are termed doubly crosslinked microgels (DX MGs). Here, we study for the first time the effects of intra-MG crosslinking on the swelling of the MGs and the mechanical properties of the DX MGs. The MGs were synthesised by emulsion copolymerisation of ethyl acrylate (EA) or methacrylic acid (MAA) and divinylbenzene (DVB). The latter was a crosslinking monomer. For comparison, MGs were prepared where DVB was replaced by either 1,4-butanediol diacrylate (BDDA) or a 1 : 1 mixture of both DVB and BDDA. The MG swelling behaviours were studied by dynamic light scattering; whereas, the DX MG mechanical properties were studied by dynamic rheology and uniaxial compression measurements. Inclusion of DVB within the MGs resulted in both highly swelling MGs and highly ductile DX MGs. The average strain-at-break value for the DVB-containing DX MGs was 76% which represents the highest value yet reported for a DX MG prepared using commercially available monomers. It was also shown that good tuneability of the DX MG properties could be obtained simply by controlling the DVB and BDDA contents within the MG particles. Analysis of the swelling and compression data enabled relationships between the volume-swelling ratio of the MGs and either the modulus or strain-at-break values for the DX MGs. These relationships also applied to a DVB-free system prepared with a low BDDA content. An interesting conclusion from this study is that the DX MGs can be thought of mechanically as macroscopic MG particles. The results of this study provide design tools for improving DX MG ductility and hence increasing the range of potential applications for this new class of hydrogel.
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Affiliation(s)
- Zhengxing Cui
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
| | - Wenkai Wang
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
| | - Melody Obeng
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
| | - Mu Chen
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
| | - Shanglin Wu
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
| | - Ian Kinloch
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
| | - Brian R Saunders
- School of Materials, The University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
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46
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Yang X, Liu R, Yang M, Wang WH, Chen K. Structures of Local Rearrangements in Soft Colloidal Glasses. PHYSICAL REVIEW LETTERS 2016; 116:238003. [PMID: 27341261 DOI: 10.1103/physrevlett.116.238003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Indexed: 06/06/2023]
Abstract
We image local structural rearrangements in soft colloidal glasses under small periodic perturbations induced by thermal cycling. Local structural entropy S_{2} positively correlates with observed rearrangements in colloidal glasses. The high S_{2} values of the rearranging clusters in glasses indicate that fragile regions in glasses are structurally less correlated, similar to structural defects in crystalline solids. Slow-evolving high S_{2} spots are capable of predicting local rearrangements long before the relaxations occur, while fluctuation-created high S_{2} spots best correlate with local deformations right before the rearrangement events. Local free volumes are also found to correlate with particle rearrangements at extreme values, although the ability to identify relaxation sites is substantially lower than S_{2}. Our experiments provide an efficient structural identifier for the fragile regions in glasses and highlight the important role of structural correlations in the physics of glasses.
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Affiliation(s)
- Xiunan Yang
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Rui Liu
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Mingcheng Yang
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Wei-Hua Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Ke Chen
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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47
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Conley GM, Nöjd S, Braibanti M, Schurtenberger P, Scheffold F. Superresolution microscopy of the volume phase transition of pNIPAM microgels. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.03.010] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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48
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Pellet C, Cloitre M. The glass and jamming transitions of soft polyelectrolyte microgel suspensions. SOFT MATTER 2016; 12:3710-20. [PMID: 26984383 DOI: 10.1039/c5sm03001c] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We explore the influence of particle softness on the state diagram of well characterized polyelectrolyte microgel suspensions using dynamic light scattering and rheology. Upon increasing the polymer concentration, we cross successively the well defined glass and jamming transitions which delimit four different states: dilute colloidal suspension, entropic glass, jammed glass, and dense glass. Each state has a specific dynamical fingerprint dictated by two key ingredients related to particle softness: elastic contact interactions, and osmotic or steric deswelling. Soft interactions control yielding and flow of the jammed glasses. The shrinkage of the microgels makes the glass transition look smoother than in hard sphere suspensions. We quantify the relationship between the polymer concentration and the volume fraction, and show that the glass transition behaviour of soft microgels can be mapped to that of hard sphere glasses once the volume fraction is used as the control parameter.
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Affiliation(s)
- Charlotte Pellet
- Laboratoire Matière Molle et Chimie, (UMR 7167, ESPCI-CNRS) ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
| | - Michel Cloitre
- Laboratoire Matière Molle et Chimie, (UMR 7167, ESPCI-CNRS) ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
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49
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Appel J, Fölker B, Sprakel J. Mechanics at the glass-to-gel transition of thermoresponsive microgel suspensions. SOFT MATTER 2016; 12:2515-2522. [PMID: 26843322 DOI: 10.1039/c5sm02940f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We study the rheology of systems of thermoresponsive microgels which can transition between a repulsive glass and an attractive gel state. We find marked differences between these two colloidal solids, within the same experimental system, due to the different origins for their dynamic arrest. While the rigidity of the repulsive systems depends solely on particle volume fraction, we find that the change in linear elasticity upon introducing attractive bonds in the system scales linearly with the adhesive bond strength which can be tuned with the temperature in our experiments. And while the glasses yield reversibly and with a rate-dependent energy dissipation, bond-reorganisation in the gels is suppressed so that their rupture is irreversible and accompanied by a high, but rate-independent, dissipation. These results highlight how colloids with responsive interactions can be employed to shed new light onto solid-solid transitions.
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Affiliation(s)
- Jeroen Appel
- Physical Chemistry and Soft Matter, Wageningen University, Dreijenplein 6, 6703 HB, Wageningen, The Netherlands.
| | - Bart Fölker
- Physical Chemistry and Soft Matter, Wageningen University, Dreijenplein 6, 6703 HB, Wageningen, The Netherlands.
| | - Joris Sprakel
- Physical Chemistry and Soft Matter, Wageningen University, Dreijenplein 6, 6703 HB, Wageningen, The Netherlands.
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50
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Späth A, Graf-Zeiler BA, Paradossi G, Ghugare S, Tzvetkov G, Fink RH. Quantitative X-ray microscopic analysis of individual thermoresponsive microgel particles in aqueous solution. RSC Adv 2016. [DOI: 10.1039/c6ra20142c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The temperature dependent phase transition of individual thermoresponsive microgel particles in aqueous solution has been studied by high resolution soft X-ray transmission microscopy (STXM).
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Affiliation(s)
- Andreas Späth
- Physikalische Chemie II
- ICMM
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Birgit A. Graf-Zeiler
- Physikalische Chemie II
- ICMM
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche
- Università di Roma Tor Vergata
- 00133 Roma
- Italy
| | - Shivkumar Ghugare
- Dipartimento di Scienze e Tecnologie Chimiche
- Università di Roma Tor Vergata
- 00133 Roma
- Italy
| | - George Tzvetkov
- Department of Inorganic Chemistry
- Faculty of Chemistry
- University of Sofia
- 1164 Sofia
- Bulgaria
| | - Rainer H. Fink
- Physikalische Chemie II
- ICMM
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
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