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Komarova GA, Gumerov RA, Rudyak VY, Kozhunova EY, Potemkin II, Nasimova IR. Peculiarities of Emulsions Stabilized by Stimuli-Responsive Interpenetrating Polymeric Network Microgels. Langmuir 2024; 40:9414-9425. [PMID: 38651693 DOI: 10.1021/acs.langmuir.3c03649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Emulsions have become a crucial product form in various industries in modern times. Expanding the class of substances used to stabilize emulsions can improve their stability or introduce new properties. Particularly, the use of stimuli-responsive microgels makes it possible to create "smart" emulsions whose stability can be controlled by changing any of the specified stimuli. Thus, finding new ways to stabilize emulsions may broaden their application. In this work, for the first time, we applied microgels based on interpenetrating polymeric networks (IPNs) of poly(N-isopropylacrylamide) (PNIPAM) and poly(acrylic acid) (PAA) as stabilizing agents for "oil-in-water" emulsions. We have demonstrated that emulsions stabilized by such soft particles can remain colloidally stable for an extended period, even after being heated up to 40 °C, which is above the lower critical solution temperature (LCST) of PNIPAM. On the contrary, the emulsions stabilized by PNIPAM homopolymer microgels were broken upon heating. To understand the stabilization mechanism of the emulsions, mesoscopic computer simulations were performed to study the IPN microgels at the liquid-liquid interface. The simulations demonstrated that when the first subnetwork (PNIPAM) collapses, the particle adopts a flattened core-shell morphology with a highly swollen PAA-rich shell and a collapsed PNIPAM-rich core. Unlike its PNIPAM homopolymer counterpart, the IPN microgel maintains its three-dimensional shape, which provides stability to the microgel-based emulsions over a wide range of temperatures. Our combined findings could be useful in developing new approaches to emulsions' storage, biphasic catalysis, and lubrication of mechanisms in various operating and climatic conditions.
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Affiliation(s)
- Galina A Komarova
- Physics Department, Lomonosov Moscow State University, Leninskie gory 1-2, 119991 Moscow, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie gory 1-2, 119991 Moscow, Russian Federation
| | - Vladimir Yu Rudyak
- Department of Condensed Matter, School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
| | - Elena Yu Kozhunova
- Physics Department, Lomonosov Moscow State University, Leninskie gory 1-2, 119991 Moscow, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie gory 1-2, 119991 Moscow, Russian Federation
| | - Irina R Nasimova
- Physics Department, Lomonosov Moscow State University, Leninskie gory 1-2, 119991 Moscow, Russian Federation
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2
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Bushuev NV, Gumerov RA, Rudov AA, Potemkin II. Compression and Ordering of Hollow Microgels in Monolayers Formed at Liquid-Liquid Interfaces. Langmuir 2023; 39:12420-12429. [PMID: 37611207 DOI: 10.1021/acs.langmuir.3c01648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Abstract
Monolayers of polymer microgels with a spherical cavity adsorbed at the liquid-liquid interface were studied using mesoscopic computer simulations. One liquid, named water, was always considered as a good solvent, while the microgel solubility in the second liquid, named oil, was varied. The symmetric and asymmetric cases of vanishing and the strong differences in solubility between the network particles and the liquids were considered. The simulations provided us with an insight into the shape and volume changes of the microgels upon compression, making it possible to relate the response of the individual network with the collective order and structure of the monolayer. Similar to regular microgels, the compression of the monolayer of hollow particles led to a decrease in lateral sizes accompanied by shape transformation from a flattened to a nearly spherical shape. However, the presence of a cavity filled with solvent caused some unique differences in the behavior of the system. The adsorption pathway of hollow microgels at the liquid interface predefines: (a) the position of the particles with respect to the interface and (b) the structure of the monolayer. A striking discovery is that in the symmetric case of similar solubility of the microgel in both liquids, it is possible to produce a monolayer in which one part of the network faces the aqueous phase and the other part faces the oil phase. The polymer concentration profiles plotted along the normal to the interface reveal a redistribution of polymeric mass of the microgels relative to the interface, distinguishing between the microgels whose cavities are filled with water and oil, respectively. Moreover, the ratio between the microgels faced in water and oil does not change upon compression and predetermines the response and order of the monolayer.
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Affiliation(s)
- Nikita V Bushuev
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Andrey A Rudov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
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Zholudev SI, Gumerov RA, Larina AA, Potemkin II. Swelling, collapse and ordering of rod-like microgels in solution: Computer simulation studies. J Colloid Interface Sci 2023; 629:270-278. [PMID: 36155922 DOI: 10.1016/j.jcis.2022.09.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 09/03/2022] [Accepted: 09/08/2022] [Indexed: 11/23/2022]
Abstract
Polymer microgels have proven to be highly promising macromolecular objects for a wide variety of applications. In particular, the soft particles of an anisotropic (rod-like) shape are of special interest because of their potential use in tissue engineering or materials design. However, a little is known about the physical behavior of such microgels in solution, which inspired us to study them using mesoscopic computer simulations. For single networks, depending on the solvent quality, the dimensional characteristics were obtained for microgels of different molecular weight, crosslinking density and aspect ratio. In particular, the conditions for the rod-to-rod (preserving the nonspherical shape) and rod-to-sphere collapse were found. In addition, the effect of the liquid-crystalline (LC) ordering was demonstrated for the ensemble of rod-like microgels at different swelling ratios, and the influence of microgel aspect ratio on the volume fraction of the LC transition was shown.
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Affiliation(s)
- Stepan I Zholudev
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Alexandra A Larina
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation; National Research South Ural State University, Chelyabinsk 454080, Russian Federation.
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4
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Kozhunova EY, Komarova GA, Anakhov MV, Gumerov RA, Potemkin II. Swift Janitor: Efficient Absorption of a Minor Component from the Mixtures of Immiscible Liquids by Thermoresponsive Macroscopic and Microscopic Hydrogels. ACS Appl Mater Interfaces 2022; 14:57244-57250. [PMID: 36512418 DOI: 10.1021/acsami.2c17402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Polymer hydrogels are known to be efficient absorbents of various aqueous solutions. Along with the hydrophilicity of the polymer network, the presence of specific functional groups is required for the absorption of respective solutes. Alternatively, a selective uptake can be realized without any specific attraction of solutes to the network, which is shown in this paper. By combining experimental and simulation approaches, we demonstrated that thermoresponsive poly(N-isopropylacrylamide) gels and microgels in compositionally strongly asymmetric water/1-octanol mixtures selectively uptake the minor (1-octanol) component. Initially swollen in water, the gels substitute water by the organic solvent upon the addition of its small fraction into aqueous solution. In turn, for microgels, it was shown that the single particles could absorb the amount of the organic liquid more than two times higher than their mass while preserving the colloidal stability. At the same time, the accumulation of 1-octanol in the networks "switches off" the temperature response. The mesoscopic computer simulations revealed a physical reason and molecular picture of the phenomenon. Absorption of the minor component by the gels is caused by the decrease in water/1-octanol interfacial tension due to the formation of the dense polymer layer at the interface. The simulations allowed tracking the evolution of the size and the internal structure of the single microgels with changing 1-octanol concentration.
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Affiliation(s)
- Elena Yu Kozhunova
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Galina A Komarova
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Mikhail V Anakhov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
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Portnov IV, Larina AA, Gumerov RA, Potemkin II. Swelling and Collapse of Cylindrical Polyelectrolyte Microgels. Polymers (Basel) 2022; 14:polym14225031. [PMID: 36433158 PMCID: PMC9694774 DOI: 10.3390/polym14225031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/12/2022] [Accepted: 11/14/2022] [Indexed: 11/22/2022] Open
Abstract
In this study, we propose computer simulations of charged cylindrical microgels. The effects of cross-linking density, aspect ratio, and fraction of charged groups on the microgel swelling and collapse with a variation in the solvent quality were studied. The results were compared with those obtained for equivalent neutral cylindrical microgels. The study demonstrated that microgels' degree of swelling strongly depends on the fraction of charged groups. Polyelectrolyte microgels under adequate solvent conditions are characterized by a larger length and thickness than their neutral analogues: the higher the fraction of charged groups, the longer their length and greater their thickness. Microgels' collapse upon solvent quality decline is characterized by a decrease in length and non-monotonous behavior of its thickness. First, the thickness decreases due to the attraction of monomer units (beads) upon collapse. The further thickness increase is related to the surface tension, which tends to reduce the anisotropy of collapsed objects (the minimum surface energy is known to be achieved for the spherical objects). This reduction is opposed by the network elasticity. The microgels with a low cross-linking density and/or a low enough aspect ratio reveal a cylinder-to-sphere collapse. Otherwise, the cylindrical shape is preserved in the course of the collapse. Aspect ratio as a function of the solvent quality (interaction parameter) demonstrates the maximum, which is solely due to the electrostatics. Finally, we plotted radial concentration profiles for network segments, their charged groups, and counterions.
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Affiliation(s)
- Ivan V. Portnov
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russia
| | - Alexandra A. Larina
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Rustam A. Gumerov
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Igor I. Potemkin
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia
- National Research South Ural State University, 454080 Chelyabinsk, Russia
- Correspondence:
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Kravchenko VS, Gumerov RA, Papadakis CM, Potemkin II. Self-Assembly of Molecular Brushes with Responsive Alternating Copolymer Side Chains. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vitaly S. Kravchenko
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow 119991, Russian Federation
| | - Rustam A. Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Christine M. Papadakis
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, Garching 85748, Germany
| | - Igor I. Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
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7
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Gumerov RA, Rudyak VY, Gavrilov AA, Chertovich AV, Potemkin II. Correction: Effect of network topology and crosslinker reactivity on microgel structure and ordering at liquid-liquid interface. Soft Matter 2022; 18:4810. [PMID: 35699144 DOI: 10.1039/d2sm90075k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Correction for 'Effect of network topology and crosslinker reactivity on microgel structure and ordering at liquid-liquid interface' by Rustam A. Gumerov et al., Soft Matter, 2022, 18, 3738-3747, https://doi.org/10.1039/D2SM00269H.
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Affiliation(s)
- Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow, 119991, Russian Federation.
| | - Vladimir Yu Rudyak
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow, 119991, Russian Federation.
| | - Alexey A Gavrilov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow, 119991, Russian Federation.
| | - Alexander V Chertovich
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow, 119991, Russian Federation.
- Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow, 119991, Russian Federation.
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
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8
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Gumerov RA, Rudyak VY, Gavrilov AA, Chertovich AV, Potemkin II. Effect of network topology and crosslinker reactivity on microgel structure and ordering at liquid-liquid interface. Soft Matter 2022; 18:3738-3747. [PMID: 35506715 DOI: 10.1039/d2sm00269h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Polymer microgels synthesized in silico were studied at a liquid-liquid interface via mesoscopic computer simulations and compared to microgels with ideal (diamond-like) structure. The effect of crosslinkers reactivity ratio on the single particle morphology at the interface and monolayer behavior was examined. It was demonstrated that single particles deform into an explicit core-corona morphology when adsorbed at the interface. An increase in the crosslinker reactivity ratio decreased both the deformation ratio and the ratio between the core and corona sizes. Meanwhile, the compression of microgel monolayers revealed the existence of five distinct interparticle contact regimes, which have been observed experimentally in the literature. The crosslinker reactivity ratio appeared to define the compression range in these regimes and the sharpness of the transition between them. In particular, the higher the crosslinker reactivity ratio, the smaller the corona, and in turn, the narrower the range of the intermediate regime comprising both core-core and corona-corona contacts. The obtained results demonstrate that the more realistic model of microgels synthesized via precipitation polymerization allows for a more accurate prediction of the properties of the microgels at a liquid-liquid interface in comparison to the conventional diamond-like lattice model.
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Affiliation(s)
- Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation.
| | - Vladimir Yu Rudyak
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation.
| | - Alexey A Gavrilov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation.
| | - Alexander V Chertovich
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation.
- Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation.
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
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9
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Desai P, Rimal R, Florea A, Gumerov RA, Santi M, Sorokina AS, Sahnoun SEM, Fischer T, Mottaghy FM, Morgenroth A, Mourran A, Potemkin II, Möller M, Singh S. Tuning the Elasticity of Nanogels Improves Their Circulation Time by Evading Immune Cells. Angew Chem Int Ed Engl 2022; 61:e202116653. [PMID: 35274425 PMCID: PMC9325431 DOI: 10.1002/anie.202116653] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Indexed: 12/22/2022]
Abstract
Peptide receptor radionuclide therapy is used to treat solid tumors by locally delivering radiation. However, due to nephro‐ and hepato‐toxicity, it is limited by its dosage. To amplify radiation damage to tumor cells, radiolabeled nanogels can be used. We show that by tuning the mechanical properties of nanogels significant enhancement in circulation half‐life of the gel could be achieved. We demonstrate why and how small changes in the mechanical properties of the nanogels influence its cellular fate. Nanogels with a storage modulus of 37 kPa were minimally phagocytosed by monocytes and macrophages compared to nanogels with 93 kPa modulus. Using PET/CT a significant difference in the blood circulation time of the nanogels was shown. Computer simulations affirmed the results and predicted the mechanism of cellular uptake of the nanogels. Altogether, this work emphasizes the important role of elasticity even for particles that are inherently soft such as nano‐ or microgels.
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Affiliation(s)
- Prachi Desai
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Rahul Rimal
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Alexandru Florea
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
- Department of Radiology and Nuclear Medicine School for Cardiovascular Diseases (CARIM) and School for Oncology (GROW) Maastricht University 6229 HX Maastricht The Netherlands
| | - Rustam A. Gumerov
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
| | - Marta Santi
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Anastasia S. Sorokina
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
| | - Sabri E. M. Sahnoun
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
| | - Thorsten Fischer
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Felix M. Mottaghy
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
- Department of Radiology and Nuclear Medicine School for Cardiovascular Diseases (CARIM) and School for Oncology (GROW) Maastricht University 6229 HX Maastricht The Netherlands
| | - Agnieszka Morgenroth
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
| | - Ahmed Mourran
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Igor I. Potemkin
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
- National Research South Ural State University Chelyabinsk 454080 Russian Federation
| | - Martin Möller
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Smriti Singh
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Max Planck Institute for Medical Research (MPImF) Jahnstrasse 29 69120 Heidelberg Germany
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Desai P, Rimal R, Florea A, Gumerov RA, Santi M, Sorokina AS, Sahnoun SEM, Fischer T, Mottaghy FM, Morgenroth A, Mourran A, Potemkin II, Möller M, Singh S. Inside Back Cover: Tuning the Elasticity of Nanogels Improves Their Circulation Time by Evading Immune Cells (Angew. Chem. Int. Ed. 20/2022). Angew Chem Int Ed Engl 2022. [DOI: 10.1002/anie.202204930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Prachi Desai
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Rahul Rimal
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Alexandru Florea
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
- Department of Radiology and Nuclear Medicine School for Cardiovascular Diseases (CARIM) and School for Oncology (GROW) Maastricht University 6229 HX Maastricht The Netherlands
| | - Rustam A. Gumerov
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
| | - Marta Santi
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Anastasia S. Sorokina
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
| | - Sabri E. M. Sahnoun
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
| | - Thorsten Fischer
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Felix M. Mottaghy
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
- Department of Radiology and Nuclear Medicine School for Cardiovascular Diseases (CARIM) and School for Oncology (GROW) Maastricht University 6229 HX Maastricht The Netherlands
| | - Agnieszka Morgenroth
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
| | - Ahmed Mourran
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Igor I. Potemkin
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
- National Research South Ural State University Chelyabinsk 454080 Russian Federation
| | - Martin Möller
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Smriti Singh
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Max Planck Institute for Medical Research (MPImF) Jahnstrasse 29 69120 Heidelberg Germany
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Kang JJ, Sachse C, Ko CH, Schroer MA, Vela SD, Molodenskiy D, Kohlbrecher J, Bushuev NV, Gumerov RA, Potemkin II, Jordan R, Papadakis CM. Rigid-to-Flexible Transition in a Molecular Brush in a Good Solvent at a Semidilute Concentration. Langmuir 2022; 38:5226-5236. [PMID: 35166545 DOI: 10.1021/acs.langmuir.1c02589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The structures of a molecular brush in a good solvent are investigated using synchrotron small-angle X-ray scattering in a wide range of concentrations. The brush under study, PiPOx239-g-PnPrOx14, features a relatively long poly(2-isopropenyl-2-oxazoline) (PiPOx) backbone and short poly(2-n-propyl-2-oxazoline) (PnPrOx) side chains. As a solvent, ethanol is used. By model fitting, the overall size and the persistence length as well as the interaction length and interaction strength are determined. At this, the interplay between form and structure factor is taken into account. The conformation of the molecular brush is traced upon increasing the solution concentration, and a rigid-to-flexible transition is found near the overlap concentration. Finally, the results of computer simulations of the molecular brush solutions confirm the experimental results.
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Affiliation(s)
- Jia-Jhen Kang
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Clemens Sachse
- Professur für Makromolekulare Chemie, Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, Mommsenstraße 4, 01069 Dresden, Germany
| | - Chia-Hsin Ko
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Martin A Schroer
- European Molecular Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Stefano Da Vela
- European Molecular Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Dmitry Molodenskiy
- European Molecular Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Joachim Kohlbrecher
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Forschungsstr. 111, 5232 Villigen PSI, Switzerland
| | - Nikita V Bushuev
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
| | - Rainer Jordan
- Professur für Makromolekulare Chemie, Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, Mommsenstraße 4, 01069 Dresden, Germany
| | - Christine M Papadakis
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
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12
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Desai P, Rimal R, Florea A, Gumerov RA, Santi M, Sorokina AS, Sahnoun SEM, Fischer T, Mottaghy FM, Morgenroth A, Mourran A, Potemkin II, Möller M, Singh S. Tuning the Elasticity of Nanogels Improves Their Circulation Time by Evading Immune Cells. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Prachi Desai
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Rahul Rimal
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Alexandru Florea
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
- Department of Radiology and Nuclear Medicine School for Cardiovascular Diseases (CARIM) and School for Oncology (GROW) Maastricht University 6229 HX Maastricht The Netherlands
| | - Rustam A. Gumerov
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
| | - Marta Santi
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Anastasia S. Sorokina
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
| | - Sabri E. M. Sahnoun
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
| | - Thorsten Fischer
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Felix M. Mottaghy
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
- Department of Radiology and Nuclear Medicine School for Cardiovascular Diseases (CARIM) and School for Oncology (GROW) Maastricht University 6229 HX Maastricht The Netherlands
| | - Agnieszka Morgenroth
- Department of Nuclear Medicine University Hospital RWTH Aachen Pauwelstraße 30 52074 Aachen Germany
| | - Ahmed Mourran
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Igor I. Potemkin
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Physics Department Lomonosov Moscow State University Leninskie Gory 1–2 119991 Moscow Russian Federation
- National Research South Ural State University Chelyabinsk 454080 Russian Federation
| | - Martin Möller
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
| | - Smriti Singh
- DWI Leibniz Institute for Interactive Materials e.V RWTH Aachen University Forckenbeckstrasse 50 52074 Aachen Germany
- Max Planck Institute for Medical Research (MPImF) Jahnstrasse 29 69120 Heidelberg Germany
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13
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Desai P, Rimal R, Florea A, Gumerov RA, Santi M, Sorokina AS, Sahnoun SEM, Fischer T, Mottaghy FM, Morgenroth A, Mourran A, Potemkin II, Möller M, Singh S. Tuning the Elasticity of Nanogels Improves their Circulation Time by Evading Immune Cells. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202116653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Prachi Desai
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien Macromolecular Chemistry Aachen GERMANY
| | - Rahul Rimal
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien Macromolecular chemistry Aachen GERMANY
| | - Alexandru Florea
- Uniklinik RWTH Aachen: Universitatsklinikum Aachen Nuclear Medicine GERMANY
| | - Rustam A. Gumerov
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova Physics RUSSIAN FEDERATION
| | - Marta Santi
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien Macromolecular Chemistry GERMANY
| | - Anastasia S. Sorokina
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova Physics RUSSIAN FEDERATION
| | | | - Thorsten Fischer
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien Macromolecular Chemistry GERMANY
| | - Felix M. Mottaghy
- Uniklinik RWTH Aachen: Universitatsklinikum Aachen Nuclear Medicine GERMANY
| | | | - Ahmed Mourran
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien Macromolecular chemistry GERMANY
| | - Igor I. Potemkin
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova Physics RUSSIAN FEDERATION
| | - Martin Möller
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien Macromolecular Chemistry GERMANY
| | - Smriti Singh
- Max-Planck-Institute for Medical Research: Max-Planck-Institut fur medizinische Forschung Cellular Biophysics Jahnstr. 29 Heidelberg GERMANY
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14
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Höhner JR, Gumerov RA, Potemkin II, Rodriguez-Emmenegger C, Kostina NY, Mourran A, Englert J, Schröter D, Janke L, Möller M. Globular Hydrophilic Poly(acrylate)s by an Arborescent Grafting-from Synthesis. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Robin Höhner
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Rustam A. Gumerov
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Igor I. Potemkin
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
| | | | - Nina Yu. Kostina
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Ahmed Mourran
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Jenny Englert
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - David Schröter
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Lennart Janke
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Martin Möller
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
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15
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Rodichkin ID, Gumerov RA, Potemkin II. Self-assembly of miktoarm palm tree-like star copolymers in a selective solvent. J Colloid Interface Sci 2022; 606:1966-1973. [PMID: 34749445 DOI: 10.1016/j.jcis.2021.09.196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/29/2021] [Accepted: 09/30/2021] [Indexed: 11/25/2022]
Abstract
Amphiphilic miktoarm star copolymers with one long solvophobic arm (a "stem") and several short solvophilic arms (the "leaves") were studied in a selective solvent using mesoscopic computer simulations. The conventional morphologies (spherical, cylindrical and vesicular) as well as the mixed ones were obtained. However, the resulting diagram of states appeared to be different from the diagram of the linear diblock copolymer with the analogous composition. Namely, the increase of the number of leaves at fixed solvophobic-solvophilic ratio leads to the transition from the vesicles to the cylinders, while the latter ones eventually transform into spherical micelles in the case of highly branched copolymers. The observed effect appears due to the increase of the interfacial area between the collapsed and swollen blocks per single macromolecule. In turn, the increase of the solvent selectivity shifts the stability region of the cylindrical micelles to the region of more symmetric copolymer composition. Meanwhile, the compatibility between the blocks has a weak effect on the resulting morphology. Finally, it was found that the increase in the number of leaves and the simultaneous decrease in their length results in the localization of higher amount of solvophilic segments near the core-solvent interface, which in the case of cylindrical micelles significantly affects the shape of the aggregates making them thinner and longer.
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Affiliation(s)
- Ivan D Rodichkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation; DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation; DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany; National Research South Ural State University, Chelyabinsk 454080, Russian Federation.
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16
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Gumerov AA, Neudachin AE, Nafikova RA, Mingulov FF, Trikoz DS, Gumerov RA, Sharipov NN, Evdokimova OY, Amineva LR. [Postoperative intussusception in children]. Khirurgiia (Mosk) 2022:68-72. [PMID: 36398958 DOI: 10.17116/hirurgia202211168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The authors present diagnosis and treatment of two children with postoperative intussusception. A 6-month baby with retroperitoneal teratoma developed clinical signs of intestinal obstruction in 2 days after surgery. The child underwent redo laparotomy, and ileocecal intussusception was found. In the second case, a 6-month baby with choledochal cyst underwent laparotomy, cyst excision and Roux-en-Y-hepaticojejunostomy. Six days later, clinical deterioration with signs of bowel obstruction appeared. Redo laparotomy was performed for early adhesive ileus, and ileoileal intussusception was observed. In both cases, postoperative intussusception was diagnosed during relaparatomy that confirms the complexity of diagnosis.
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Affiliation(s)
- A A Gumerov
- Bashkir State Medical University, Ufa, Russia
| | | | | | | | - D S Trikoz
- Republican Children's Hospital, Ufa, Russia
| | - R A Gumerov
- Bashkir State Medical University, Ufa, Russia
- Republican Children's Hospital, Ufa, Russia
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Hoppe Alvarez L, Rudov AA, Gumerov RA, Lenssen P, Simon U, Potemkin II, Wöll D. Controlling microgel deformation via deposition method and surface functionalization of solid supports. Phys Chem Chem Phys 2021; 23:4927-4934. [PMID: 33620358 DOI: 10.1039/d0cp06355j] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Soft matter at solid-liquid interfaces plays an important role in multiple scientific disciplines as well as in various technological fields. For microgels, representing highly interesting soft matter systems, we demonstrate that the preparation method, i.e. the way how the microgel is applied to the specific surface, plays a key role. Focusing on the three most common sample preparation methods (spin-coating, drop-casting and adsorption from solution), we performed a comparative study of the deformation behavior of microgels at the solid-liquid interface on three different surfaces with varying hydrophilicities. For in situ visualization of the deformation of pNIPMAM microgels, we conducted highly sensitive 3D super resolution fluorescence microscopy methods. We furthermore performed complementary molecular dynamics simulations to determine the driving force responsible for the deformation depending on the surface and the deposition method. The combination of experiments and simulations revealed that the simulated equilibrium structure obtained after simulation of the completely dry microgel after deposition is retained after rehydration and subsequent fluorescent imaging.
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Affiliation(s)
- Laura Hoppe Alvarez
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany.
| | - Andrey A Rudov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation and DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, D-52056 Aachen, Germany
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation and DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, D-52056 Aachen, Germany
| | - Pia Lenssen
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany.
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1 a, D-52056 Aachen, Germany
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation and DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, D-52056 Aachen, Germany and National Research South Ural State University, Chelyabinsk 454080, Russian Federation
| | - Dominik Wöll
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany.
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Dockendorff J, Mourran A, Gumerov RA, Potemkin II, Möller M, Gauthier M. Metal Coordination Induces Phase Segregation in Amphipolar Arborescent Copolymers with a Core–Shell–Corona Architecture. Macromolecules 2020; 53:8108-8122. [PMID: 35516458 PMCID: PMC9062874 DOI: 10.1021/acs.macromol.0c00778] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 07/07/2020] [Indexed: 01/08/2023]
Abstract
![]()
Arborescent
copolymers with a core–shell–corona (CSC)
architecture were synthesized and the topology of the molecules was
challenged (constrained) through intramolecular interactions, resulting
in phase separation breaking the symmetry of radial density. The inner
poly(2-vinylpyridine) shell of these arborescent polystyrene-g-[poly(2-vinylpyridine)-b-polystyrene]
molecules can self-assemble by binding metallic salts and acids in
apolar and intermediate-polarity solvents. Upon loading with HAuCl4, the characteristics of the polymer templates govern the
“loading sites” of the metal within the molecules. Unique
morphologies were observed for the metal-loaded G0–G4 arborescent
copolymers investigated, namely, spherical, toroidal, raspberry-like,
spherical nanocage, and a new worm-in-sphere morphology. The reason
for the emergence of such morphologies is the interplay among intramolecular
interactions of unlike polymer segments, solvent selectivity, the
entropic elasticity of the arborescent substrate, and phase segregation
induced by coordination with the charged metallic species. Meanwhile,
the stability of the arborescent molecules against aggregation provides
intramolecular phase segregation with imposed “confined”
geometry and thus leads to nonconventional morphologies. Furthermore,
the size of the arborescent molecules is much smaller than that of
other known particles (droplets) serving as confined geometries. Computer
simulations were used to model the mesostructure of the arborescent
copolymers, to demonstrate the influence of solvent selectivity, together
with HAuCl4 loading, on the evolution of the morphology
of the macromolecules.
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Affiliation(s)
- Jason Dockendorff
- Department of Chemistry, Institute for Polymer Research and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Ahmed Mourran
- DWI-Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, D-52056 Aachen, Germany
| | - Rustam A. Gumerov
- DWI-Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, D-52056 Aachen, Germany
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Igor I. Potemkin
- DWI-Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, D-52056 Aachen, Germany
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- South Ural State University (National Research University), Chelyabinsk 454080, Russian Federation
| | - Martin Möller
- DWI-Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, D-52056 Aachen, Germany
| | - Mario Gauthier
- Department of Chemistry, Institute for Polymer Research and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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Anakhov MV, Gumerov RA, Richtering W, Pich A, Potemkin II. Scavenging One of the Liquids versus Emulsion Stabilization by Microgels in a Mixture of Two Immiscible Liquids. ACS Macro Lett 2020; 9:736-742. [PMID: 35648562 DOI: 10.1021/acsmacrolett.0c00191] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
It is known that microgels can serve as soft, permeable and stimuli-responsive alternative of solid colloidal particles to stabilize oil-water emulsions. The driving force for the adsorption of the microgels on interface of two immiscible liquids is a shielding of unfavorable oil-water contacts by adsorbed subchains, that is, the decrease of the surface tension between the liquids. Such phenomenon usually proceeds if volume fractions of the two liquids are comparable with each other and the microgel concentration is not high enough. The natural question arises: what is going on with the system in the opposite case of strongly asymmetric mixture (one of the liquids (oil) has a very small fraction) or high microgel concentration (the overall volume of the microgels exceeds the volume of the minor oil component)? Here we demonstrate that the microgels uptake the oil whose concentration within the microgels can be orders of magnitude higher than outside, leading to the additional microgel swelling (in comparison with the swelling in water). Thus, the microgels can serve as scavengers and concentrators of liquids dissolved in water. At first glance, this effect seems counterintuitive. However, it has a clear physical reason related to the incompatibility of oil and water. Absorption of the oil by microgels reduces unfavorable oil-water contacts by microgel segments: the microgels have a higher concentration of the segments at the periphery, forming a shell. The microgels with uptaken oil are stable toward aggregation at very small oil concentration in the mixture. However, an increase in the oil concentration can lead to aggregation of the microgels into dimers, trimers, and so on. The increasing concentration of oil mediates the attraction between the microgels: the oil in the aggregates appears to be localized in-between the microgels instead of their interior, which is accompanied by the release of the elastic stress of the microgels. A further increase in the oil concentration results in a growth of the size of the oil droplets between the microgels and the number of the microgels at the droplet's periphery, that is, the emulsion is formed.
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Affiliation(s)
- Mikhail V. Anakhov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A. Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, Aachen 52056, Germany
| | - Andrij Pich
- DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, 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
| | - Igor I. Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
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Bushuev NV, Gumerov RA, Bochenek S, Pich A, Richtering W, Potemkin II. Compression and Ordering of Microgels in Monolayers Formed at Liquid-Liquid Interfaces: Computer Simulation Studies. ACS Appl Mater Interfaces 2020; 12:19903-19915. [PMID: 32248678 DOI: 10.1021/acsami.0c01600] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Monolayers of polymer microgels adsorbed at the liquid interfaces were studied by dissipative particle dynamics simulations. The results demonstrated that the compressibility of the monolayers can be widely tuned by varying the cross-linking density of the microgels and their (in)compatibility with the immiscible liquids. In particular, the compression of the monolayers (increase of 2D concentration of the microgels) leads to the decrease of their lateral size. Herewith, the shape of the individual soft particles gradually changes from oblate (diluted 2D system) to nearly spherical (compressed monolayer). The polymer concentration profiles plotted along the normal to the interface reveal a nonmonotonous shape with a sharp maximum at the interface. This is a consequence of the shielding effect: saturation of the interface by monomer units of the subchains is driven by minimization of unfavorable contacts between the immiscible liquids and is opposed by elasticity of the network. The decrease of the interfacial tension upon concentration (compression) of the monolayer is quantified. It has been demonstrated that the interfacial tension significantly differs if the solubility of the polymer chains of the microgel network in the liquids changes. These results correlate well with experimental data. The examination of the microgels' crystalline ordering in monolayers demonstrated a nonmonotonous dependency on the compression degree (microgel concentration). Finally, the worsening of the solvent quality leads to the collapse of the microgels in monolayer and nonmonotonous behavior of the interfacial tension.
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Affiliation(s)
- Nikita V Bushuev
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- DWI-Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
| | - Steffen Bochenek
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, Aachen 52056, Germany
| | - Andrij Pich
- DWI-Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
- Aachen Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Urmonderbaan 22, Geleen 6167 RD, The Netherlands
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, Aachen 52056, Germany
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- DWI-Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
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Gumerov RA, Gau E, Xu W, Melle A, Filippov SA, Sorokina AS, Wolter NA, Pich A, Potemkin II. Amphiphilic PVCL/TBCHA microgels: From synthesis to characterization in a highly selective solvent. J Colloid Interface Sci 2020; 564:344-356. [DOI: 10.1016/j.jcis.2019.12.123] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 12/26/2019] [Accepted: 12/27/2019] [Indexed: 10/25/2022]
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Bochenek S, Scotti A, Ogieglo W, Fernández-Rodríguez MÁ, Schulte MF, Gumerov RA, Bushuev NV, Potemkin II, Wessling M, Isa L, Richtering W. Effect of the 3D Swelling of Microgels on Their 2D Phase Behavior at the Liquid-Liquid Interface. Langmuir 2019; 35:16780-16792. [PMID: 31782927 DOI: 10.1021/acs.langmuir.9b02498] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigate soft, temperature-sensitive microgels at fluid interfaces. Though having an isotropic, spherical shape in bulk solution, the microgels become anisotropic upon adsorption. The structure of microgels at interfaces is described by a core-corona morphology. Here, we investigate how changing temperature across the microgel volume phase transition temperature, which leads to swelling/deswelling of the microgels in the aqueous phase, affects the phase behavior within the monolayer. We combine compression isotherms, atomic force microscopy imaging, multiwavelength ellipsometry, and computer simulations. At low compression, the interaction between adsorbed microgels is dominated by their highly stretched corona and the phase behavior of the microgel monolayers is the same. The polymer segments within the interface lose their temperature-sensitivity because of the strong adsorption to the interface. At high compression, however, the portions of the microgels that are located in the aqueous side of the interface become relevant and prevail in the microgel interactions. These portions are able to collapse and, consequently, the isostructural phase transition is altered. Thus, the temperature-dependent swelling perpendicular to the interface ("3D") affects the compressibility parallel to the interface ("2D"). Our results highlight the distinctly different behavior of soft, stimuli-sensitive microgels as compared to rigid nanoparticles.
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Affiliation(s)
- Steffen Bochenek
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
| | - Andrea Scotti
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
| | - Wojciech Ogieglo
- Chemical Process Engineering , RWTH Aachen University , Forckenbeckstrasse 51 , 52064 Aachen , Germany
| | - Miguel Ángel Fernández-Rodríguez
- Laboratory for Soft Materials and Interfaces, Department of Materials , ETH Zurich , Vladimir-Prelog-Weg 1-5/10 , 8093 Zurich , Switzerland
| | - M Friederike Schulte
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
| | - Rustam A Gumerov
- Physics Department , Lomonosov Moscow State University , Moscow 119991 , Russian Federation
- DWI-Leibniz Institute for Interactive Materials , Forckenbeckstrasse 50 , Aachen 52056 , Germany
| | - Nikita V Bushuev
- Physics Department , Lomonosov Moscow State University , Moscow 119991 , Russian Federation
| | - Igor I Potemkin
- Physics Department , Lomonosov Moscow State University , Moscow 119991 , Russian Federation
- DWI-Leibniz Institute for Interactive Materials , Forckenbeckstrasse 50 , Aachen 52056 , Germany
- National Research South Ural State University , Chelyabinsk 454080 , Russian Federation
| | - Matthias Wessling
- Chemical Process Engineering , RWTH Aachen University , Forckenbeckstrasse 51 , 52064 Aachen , Germany
- DWI-Leibniz Institute for Interactive Materials , Forckenbeckstrasse 50 , Aachen 52056 , Germany
| | - Lucio Isa
- Laboratory for Soft Materials and Interfaces, Department of Materials , ETH Zurich , Vladimir-Prelog-Weg 1-5/10 , 8093 Zurich , Switzerland
| | - Walter Richtering
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
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Hoppe Alvarez L, Eisold S, Gumerov RA, Strauch M, Rudov AA, Lenssen P, Merhof D, Potemkin II, Simon U, Wöll D. Deformation of Microgels at Solid-Liquid Interfaces Visualized in Three-Dimension. Nano Lett 2019; 19:8862-8867. [PMID: 31642321 DOI: 10.1021/acs.nanolett.9b03688] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Solid-liquid interfaces play an important role for functional devices. Hence, a detailed understanding of the interaction of soft matter objects with solid supports and of the often concomitant structural deformations is of great importance. We address this topic in a combined experimental and simulation approach. We investigated thermoresponsive poly(N-isopropylmethacrylamide) microgels (μGs) at different surfaces in an aqueous environment. As super-resolution fluorescence imaging method, three-dimensional direct stochastical optical reconstruction microscopy (dSTORM) allowed for visualizing μGs in their three-dimensional (3D) shape, for example, in a "fried-egg" conformation depending on the hydrophilicity of the surface (strength of adsorption). The 3D shape, as defined by point clouds obtained from single-molecule localizations, was analyzed. A new fitting algorithm yielded an isosurface of constant density which defines the deformation of μGs at the different surfaces. The presented methodology quantifies deformation of objects with fuzzy surfaces and allows for comparison of their structures, whereby it is completely independent from the data acquisition method. Finally, the experimental data are complemented with mesoscopic computer simulations in order to (i) rationalize the experimental results and (ii) to track the evolution of the shape with changing surface hydrophilicity; a good correlation of the shapes obtained experimentally and with computer simulations was found.
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Affiliation(s)
- Laura Hoppe Alvarez
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , D-52056 Aachen , Germany
| | - Sabine Eisold
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 a , D-52056 Aachen , Germany
| | - Rustam A Gumerov
- Physics Department , Lomonosov Moscow State University , Leninskie Gory 1-2 , Moscow 119991 , Russian Federation
- DWI - Leibniz-Institute for Interactive Materials , Forckenbeckstraße 50 , D-52056 Aachen , Germany
| | - Martin Strauch
- Institute of Imaging and Computer Vision , RWTH Aachen University , Kopernikusstraße 16 , 52074 Aachen , Germany
| | - Andrey A Rudov
- Physics Department , Lomonosov Moscow State University , Leninskie Gory 1-2 , Moscow 119991 , Russian Federation
- DWI - Leibniz-Institute for Interactive Materials , Forckenbeckstraße 50 , D-52056 Aachen , Germany
| | - Pia Lenssen
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , D-52056 Aachen , Germany
| | - Dorit Merhof
- Institute of Imaging and Computer Vision , RWTH Aachen University , Kopernikusstraße 16 , 52074 Aachen , Germany
| | - Igor I Potemkin
- Physics Department , Lomonosov Moscow State University , Leninskie Gory 1-2 , Moscow 119991 , Russian Federation
- DWI - Leibniz-Institute for Interactive Materials , Forckenbeckstraße 50 , D-52056 Aachen , Germany
- National Research South Ural State University , Chelyabinsk 454080 , Russian Federation
| | - Ulrich Simon
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 a , D-52056 Aachen , Germany
| | - Dominik Wöll
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , D-52056 Aachen , Germany
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Gumerov RA, Filippov SA, Richtering W, Pich A, Potemkin II. Amphiphilic microgels adsorbed at oil-water interfaces as mixers of two immiscible liquids. Soft Matter 2019; 15:3978-3986. [PMID: 31025694 DOI: 10.1039/c9sm00389d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Amphiphilic microgels adsorbed at an oil-water interface were studied by means of dissipative particle dynamics (DPD) simulations. The hydrophobic (A) and hydrophilic (B) monomer units in the polymer network are considered to be randomly distributed. Effects of the crosslinking density, interfacial tension between the liquids, their selectivity as solvents towards species A and B, and the degree of incompatibility between the A and B units on the internal microgel structure and distribution of the liquids are considered. The most important predictions are that (i) two immiscible liquids can homogeneously be mixed within the microgels and (ii) the adsorbed microgels contain a high fraction of the liquids (they are swollen at the interface). Simultaneous fulfillment of these two conditions can have a high impact on the design of new and efficient catalytic systems. In particular, such microgels can mix immiscible reactants dissolved in water and oil and trigger chemical reactions in the presence of a catalyst embedded into the microgel.
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Affiliation(s)
- Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
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25
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Karg M, Pich A, Hellweg T, Hoare T, Lyon LA, Crassous JJ, Suzuki D, Gumerov RA, Schneider S, Potemkin II, Richtering W. Nanogels and Microgels: From Model Colloids to Applications, Recent Developments, and Future Trends. Langmuir 2019; 35:6231-6255. [PMID: 30998365 DOI: 10.1021/acs.langmuir.8b04304] [Citation(s) in RCA: 293] [Impact Index Per Article: 58.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nanogels and microgels are soft, deformable, and penetrable objects with an internal gel-like structure that is swollen by the dispersing solvent. Their softness and the potential to respond to external stimuli like temperature, pressure, pH, ionic strength, and different analytes make them interesting as soft model systems in fundamental research as well as for a broad range of applications, in particular in the field of biological applications. Recent tremendous developments in their synthesis open access to systems with complex architectures and compositions allowing for tailoring microgels with specific properties. At the same time state-of-the-art theoretical and simulation approaches offer deeper understanding of the behavior and structure of nano- and microgels under external influences and confinement at interfaces or at high volume fractions. Developments in the experimental analysis of nano- and microgels have become particularly important for structural investigations covering a broad range of length scales relevant to the internal structure, the overall size and shape, and interparticle interactions in concentrated samples. Here we provide an overview of the state-of-the-art, recent developments as well as emerging trends in the field of nano- and microgels. The following aspects build the focus of our discussion: tailoring (multi)functionality through synthesis; the role in biological and biomedical applications; the structure and properties as a model system, e.g., for densely packed arrangements in bulk and at interfaces; as well as the theory and computer simulation.
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Affiliation(s)
- Matthias Karg
- Physical Chemistry I , Heinrich-Heine-University Duesseldorf , 40204 Duesseldorf , Germany
| | - Andrij Pich
- DWI-Leibnitz-Institute for Interactive Materials e.V. , 52056 Aachen , Germany
- Functional and Interactive Polymers, Institute for Technical and Macromolecular Chemistry , RWTH Aachen University , 52056 Aachen , Germany
| | - Thomas Hellweg
- Physical and Biophysical Chemistry , Bielefeld University , 33615 Bielefeld , Germany
| | - Todd Hoare
- Department of Chemical Engineering , McMaster University , Hamilton , Ontario L8S 4L8 , Canada
| | - L Andrew Lyon
- Schmid College of Science and Technology , Chapman University , Orange , California 92866 , United States
| | - J J Crassous
- Institute of Physical Chemistry , RWTH Aachen University , 52056 Aachen , Germany
| | | | - Rustam A Gumerov
- DWI-Leibnitz-Institute for Interactive Materials e.V. , 52056 Aachen , Germany
- Physics Department , Lomonosov Moscow State University , Moscow 119991 , Russian Federation
| | - Stefanie Schneider
- Institute of Physical Chemistry , RWTH Aachen University , 52056 Aachen , Germany
| | - Igor I Potemkin
- DWI-Leibnitz-Institute for Interactive Materials e.V. , 52056 Aachen , Germany
- Physics Department , Lomonosov Moscow State University , Moscow 119991 , Russian Federation
- National Research South Ural State University , Chelyabinsk 454080 , Russian Federation
| | - Walter Richtering
- Institute of Physical Chemistry , RWTH Aachen University , 52056 Aachen , Germany
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26
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Gumerov AA, Neudachin AE, Mingulov FF, Bayazitov RR, Gumerov RA, Vagapova VS, Sharipov NN, Abdulmanov AK. [Rare abdominal diseases in emergency surgery]. Khirurgiia (Mosk) 2018:73-75. [PMID: 30560848 DOI: 10.17116/hirurgia201812173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Treatment of 3 children with rare abdominal diseases are presented in the article: acute gangrenous cholecystitis in newborn, gallbladder torsion, vermiform appendix torsion. The authors recall the existence of such rare diseases, especially in those cases when clinical symptoms of acute surgical abdominal pathology do not fit into the well-known canons. Diagnosis was established intraoperatively in all children that confirms difficult diagnosis of these diseases.
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Affiliation(s)
- A A Gumerov
- Department of Pediatric Surgery with a course of the Institute of Additional Postgraduate Education of the Bashkir State Medical University of Healthcare Ministry of Russia, Ufa, Russia
| | - A E Neudachin
- Republican children's clinical hospital, Ufa, Russia
| | - F F Mingulov
- Republican children's clinical hospital, Ufa, Russia
| | - R R Bayazitov
- Republican children's clinical hospital, Ufa, Russia
| | - R A Gumerov
- Republican children's clinical hospital, Ufa, Russia
| | - V Sh Vagapova
- Department of Pediatric Surgery with a course of the Institute of Additional Postgraduate Education of the Bashkir State Medical University of Healthcare Ministry of Russia, Ufa, Russia
| | - N N Sharipov
- Department of Pediatric Surgery with a course of the Institute of Additional Postgraduate Education of the Bashkir State Medical University of Healthcare Ministry of Russia, Ufa, Russia
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27
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Gumerov RA, Rudov AA, Richtering W, Möller M, Potemkin II. Amphiphilic Arborescent Copolymers and Microgels: From Unimolecular Micelles in a Selective Solvent to the Stable Monolayers of Variable Density and Nanostructure at a Liquid Interface. ACS Appl Mater Interfaces 2017; 9:31302-31316. [PMID: 28394566 DOI: 10.1021/acsami.7b00772] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Amphiphilic arborescent block copolymers of two generations (G2 and G3) and polymer microgels, obtained via cross-linking of diblock copolymers, were studied in a selective solvent and at liquid interface via dissipative particle dynamics (DPD) simulations. Depending on the primary structure, single arborescent macromolecules in selective solvent can have both core-corona and multicore structures. Self-assembly of the G2, G3, and microgels in the selective solvent is compared with equivalent linear diblock copolymers. The latter self-assemble into spherical micelles of large enough aggregation number. On the contrary, stability of unimolecular micelles is a feature of the arborescent copolymers and microgels, whereas their ability to aggregate is very low. Adsorption of the single molecules at liquid (oil-water) interface leads to their flattening and segregation of the amphiphilic blocks: hydrophilic and hydrophobic blocks are exposed toward water and oil, respectively. Depending on the character of interactions between monomer units, which can be controlled by temperature or solvent(s) quality, Janus, patchy, and nanosegregated structures can be formed within the macromolecules. Their self-assembly at the interface can lead to the formation of both loose and dense monolayers, which can be homogeneous and nanostructured. The pretty fast adsorption kinetics of G2 macromolecules make them efficient stabilizers of emulsions.
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Affiliation(s)
- Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation
- DWI-Leibniz Institute for Interactive Materials , Aachen 52056, Germany
| | - Andrey A Rudov
- Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation
- DWI-Leibniz Institute for Interactive Materials , Aachen 52056, Germany
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University , Aachen 52056, Germany
| | - Martin Möller
- DWI-Leibniz Institute for Interactive Materials , Aachen 52056, Germany
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation
- DWI-Leibniz Institute for Interactive Materials , Aachen 52056, Germany
- National Research South Ural State University , Chelyabinsk 454080, Russian Federation
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28
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Affiliation(s)
- Kirill E. Polovnikov
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Rustam A. Gumerov
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Igor I. Potemkin
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
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29
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Rumyantsev AM, Gumerov RA, Potemkin II. A polymer microgel at a liquid-liquid interface: theory vs. computer simulations. Soft Matter 2016; 12:6799-6811. [PMID: 27460037 DOI: 10.1039/c6sm01231k] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We propose a mean-field theory and dissipative particle dynamics (DPD) simulations of swelling and collapse of a polymer microgel adsorbed at the interface of two immiscible liquids (A and B). The microgel reveals surface activity and lowers A-B interfacial tension. Attempting to occupy as large an interfacial area as possible, the microgel undergoes anisotropic deformation and adopts a flattened shape. Spreading over the interface is restricted by polymer subchain elasticity. The equilibrium shape of the microgel at the interface depends on its size. Small microgels are shown to be more oblate than the larger microgels. Increasing microgel cross-link density results in stronger reduction of the surface tension and weaker flattening. As the degree of immiscibility of A and B liquids increases, the microgel volume changes in a non-monotonous fashion: the microgel contraction at moderate immiscibility of A and B liquids is followed by its swelling at high incompatibility of the liquids. The segregation regime of the liquids within and outside the microgel is different. Being segregated outside the microgel, the liquids can be fully (homogeneously) mixed or weakly segregated within it. The density profiles of the liquids and the polymer were plotted under different conditions. The theoretical and the DPD simulation results are in good agreement. We hope that our findings will be useful for the design of stimuli responsive emulsions, which are stabilized by the microgel particles, as well as for their practical applications, for instance, in biocatalysis.
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Affiliation(s)
- Artem M Rumyantsev
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russian Federation. and DWI - Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russian Federation.
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russian Federation. and DWI - Leibniz Institute for Interactive Materials, Aachen 52056, Germany
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30
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Gumerov RA, Rumyantsev AM, Rudov AA, Pich A, Richtering W, Möller M, Potemkin II. Mixing of Two Immiscible Liquids within the Polymer Microgel Adsorbed at Their Interface. ACS Macro Lett 2016; 5:612-616. [PMID: 35632381 DOI: 10.1021/acsmacrolett.6b00149] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report on the behavior of two immiscible liquids within polymer microgel adsorbed at their interface. By means of dissipative particle dynamics (DPD) simulations and theoretical analysis in the framework of the Flory-Huggins (FH) lattice theory, we demonstrate that the microgel acts as a "compatibilizer" of these liquids: their miscibility within the microgel increases considerably. If the incompatibility of the liquids is moderate, although strong enough to induce phase separation in their 1:1 composition, they form homogeneous mixture in the microgel interior. The mixture of highly incompatible liquids undergoes separation into two (micro)phases within the microgel likewise out of it; however, the segregation regime is weaker and the concentration profiles are characterized by a weaker decay (gradient) in comparison with those of two pure liquids. The enhanced miscibility is a result of the screening of unfavorable interactions between unlike liquid molecules by polymer subchains. We have shown that better miscibility of the liquids is achieved with densely cross-linked microgels. Our findings are very perspective for many applications where immiscible species have to be mixed at interfaces (like in heterogeneous catalysis).
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Affiliation(s)
- Rustam A. Gumerov
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Artem M. Rumyantsev
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- DWI − Leibniz
Institute for Interactive Materials, Aachen 52056, Germany
| | - Andrey A. Rudov
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- DWI − Leibniz
Institute for Interactive Materials, Aachen 52056, Germany
| | - Andrij Pich
- DWI − Leibniz
Institute for Interactive Materials, Aachen 52056, Germany
| | - Walter Richtering
- Institute
of Physical Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Martin Möller
- DWI − Leibniz
Institute for Interactive Materials, Aachen 52056, Germany
| | - Igor I. Potemkin
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- DWI − Leibniz
Institute for Interactive Materials, Aachen 52056, Germany
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Abstract
This work concerns interfacial adsorption and attachment of swollen microgel with low- to medium-level cross-linking density. Compared to colloids that form a second, dispersed phase, the suspended swollen microgel particles are ultrahigh molecular weight molecules, which are dissolved like a linear polymer, so that solvent and solute constitute only one phase. In contrast to recent literature in which microgels are treated as particles with a distinct surface, we consider solvent-solute interaction as well as interfacial adsorption based on the chain segments that can form trains of adsorbed segments and loops protruding from the surface into the solvent. We point out experimental results that support this discrimination between particles and microgels. The time needed for swollen microgels to adsorb at the air/water interface can be 3 orders of magnitude shorter than that for dispersed particles and decreases with decreasing cross-linking density. Detailed analysis of the microgels deformation, in the dry state, at a solid surface enabled discrimination particle like microgel in which case spreading was controlled predominantly by the elasticity and molecule like adsorption characterized by a significant overstreching, ultimately leading to chain scission of microgel strands. Dissipative particle dynamics simulations confirms the experimental findings on the interfacial activity and spreading of microgel at liquid/air interface.
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Affiliation(s)
- Ahmed Mourran
- DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Yaodong Wu
- DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation
| | - Andrey A Rudov
- DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany
- Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation
| | - Igor I Potemkin
- DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany
- Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation
| | - Andrij Pich
- DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Martin Möller
- DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany
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Stenbock-Fermor A, Rudov AA, Gumerov RA, Tsarkova LA, Böker A, Möller M, Potemkin II. Morphology-Controlled Kinetics of Solvent Uptake by Block Copolymer Films in Nonselective Solvent Vapors. ACS Macro Lett 2014; 3:803-807. [PMID: 35590704 DOI: 10.1021/mz500347n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We compare the swelling behavior of a compositionally symmetric diblock copolymer in films with nonbulk micellar morphology and with vertically oriented lamellae. The morphologies preformed by spin-coating from selective/nonselective solvents differ in shape and total area of the AB interfaces between incompatible units. Experimental measurements and dissipative particle dynamics (DPD) simulations demonstrate that AB interfaces dominate as the diffusion pathways of nonselective solvent molecules in strongly segregated films. In experiments, the lamellar films swell about 20× faster as compared to densely packed micellar structures, while the degrees of swelling at saturation are equal for the two types of morphologies. The difference in the kinetics of solvent uptake vanishes as soon as the solvent plasticizing effect allows for micelles-to-lamellae transition. DPD simulations confirm the inhomogeneous distribution of the solvent inside the film, with the higher fraction of the solvent localized at the AB interface and reveal morphology-dependent kinetics of the solvent uptake. The effect of dissimilar abilities of the nanodomains and of AB interface to serve as diffusion pathways for small molecules may find potential in designing nanosensors and heterogeneous barrier layers.
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Affiliation(s)
| | - Andrey A. Rudov
- DWI − Leibniz-Institut für Interaktive Materialien, Aachen 52056, Germany
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Rustam A. Gumerov
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Larisa A. Tsarkova
- DWI − Leibniz-Institut für Interaktive Materialien, Aachen 52056, Germany
| | - Alexander Böker
- DWI − Leibniz-Institut für Interaktive Materialien, Aachen 52056, Germany
| | - Martin Möller
- DWI − Leibniz-Institut für Interaktive Materialien, Aachen 52056, Germany
| | - Igor I. Potemkin
- DWI − Leibniz-Institut für Interaktive Materialien, Aachen 52056, Germany
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
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33
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Gumerov RA. [The use of magnetic resonance imaging in diagnostics of injury of the knee joint meniscuses]. Vestn Khir Im I I Grek 2008; 167:62-65. [PMID: 18411671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We analyzed the clinical symptoms, mechanisms of damage of the meniscuses in 286 children with special attention to diagnostic difficulties and causes of tardy hospitalization. MRI was performed in 286 patients for the diagnosis of injuries of meniscuses. In 208 children the diagnosis was made by arthroscopy. A statistical analysis has shown that the sensitivity of MRI was 89.1%, the specificity was 95.1%.
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