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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: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [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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Wang M, Wang A, Li J, Li Q, Bai S. Thermolysin-triggered short peptides self-assembly in confined space and application in cell culturing. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125213] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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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 LETTERS 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] [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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Ulker D, Tuncer C, Sezgin SB, Toptas Y, Cabuk A, Bütün V. An antibacterial composite system based on multi-responsive microgels hosting monodisperse gold nanoparticles. JOURNAL OF POLYMER RESEARCH 2017. [DOI: 10.1007/s10965-017-1336-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Schroeder R, Rudov AA, Lyon LA, Richtering W, Pich A, Potemkin II. Electrostatic Interactions and Osmotic Pressure of Counterions Control the pH-Dependent Swelling and Collapse of Polyampholyte Microgels with Random Distribution of Ionizable Groups. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01305] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ricarda Schroeder
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Functional
and Interactive Polymers, Institute of Technical and Macromolecular
Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Andrey A. Rudov
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - L. Andrew Lyon
- Schmid
College of Science and Technology, Chapman University, Orange, California 92866, United States
| | - Walter Richtering
- Institute
of Physical Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Andrij Pich
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Functional
and Interactive Polymers, Institute of Technical and Macromolecular
Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Igor I. Potemkin
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
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Tuncer C, Samav Y, Ülker D, Baker SB, Bütün V. Multi-responsive microgel of a water-soluble monomer via emulsion polymerization. J Appl Polym Sci 2015. [DOI: 10.1002/app.42072] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Cansel Tuncer
- Department of Chemistry, Faculty of Arts and Science; Eskisehir Osmangazi University; 26480 Eskisehir Turkey
| | - Yasemin Samav
- Department of Chemistry, Faculty of Arts and Science; Eskisehir Osmangazi University; 26480 Eskisehir Turkey
- The Program of Chemistry; Vocational School of Higher Education, Bilecik Seyh Edebali University; 11210 Bilecik Turkey
| | - Damla Ülker
- Department of Polymer Science and Technology; Institute of Science, Eskisehir Osmangazi University; 26480 Eskisehir Turkey
| | - Serife Betül Baker
- Department of Polymer Science and Technology; Institute of Science, Eskisehir Osmangazi University; 26480 Eskisehir Turkey
| | - Vural Bütün
- Department of Chemistry, Faculty of Arts and Science; Eskisehir Osmangazi University; 26480 Eskisehir Turkey
- Department of Polymer Science and Technology; Institute of Science, Eskisehir Osmangazi University; 26480 Eskisehir Turkey
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Gao Y, Hou C, Zhou L, Zhang D, Zhang C, Miao L, Wang L, Dong Z, Luo Q, Liu J. A dual enzyme microgel with high antioxidant ability based on engineered seleno-ferritin and artificial superoxide dismutase. Macromol Biosci 2013; 13:808-16. [PMID: 23606510 DOI: 10.1002/mabi.201300019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 02/28/2013] [Indexed: 11/09/2022]
Abstract
An antioxidant microgel with both glutathione peroxidase (GPx) and superoxide dismutase (SOD) activities is reported. Using computational design and genetic engineering methods, the main catalytic components of GPx are fabricated onto the surface of ferritin. The resulting seleno-ferritin (Se-Fn) monomers can self-assemble into nanocomposites that exhibit remarkable GPx activity due to the well organized multi-GPx catalytic centers. Subsequently, a porphyrin derivative is synthesized as an SOD mimic, and is employed to construct a synergistic dual enzyme system by crosslinking Se-Fn nanocomposites into a microgel. Significantly, this dual enzyme microgel is demonstrated to display better antioxidant ability than single GPx or SOD mimics in protecting cells from oxidative damage.
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Affiliation(s)
- Yuzhou Gao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China
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Özkara S, Andaç M, Karakoç V, Say R, Denizli A. Ion-imprinted PHEMA based monolith for the removal of Fe3+ ions from aqueous solutions. J Appl Polym Sci 2010. [DOI: 10.1002/app.33400] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9
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Pavlopoulou E, Portale G, Christodoulakis KE, Vamvakaki M, Bras W, Anastasiadis SH. Following the Synthesis of Metal Nanoparticles within pH-Responsive Microgel Particles by SAXS. Macromolecules 2010. [DOI: 10.1021/ma101477s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Pavlopoulou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, P.O. Box 1527, 711 10 Heraklion Crete, Greece
- Department of Materials Science and Technology, University of Crete, 710 03 Heraklion Crete, Greece
| | - G. Portale
- ESRF, DUBBLE CRG, Netherlands Organization for Scientific Research (NWO), F-38043 Grenoble, France
| | - K. E. Christodoulakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, P.O. Box 1527, 711 10 Heraklion Crete, Greece
- Department of Materials Science and Technology, University of Crete, 710 03 Heraklion Crete, Greece
| | - M. Vamvakaki
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, P.O. Box 1527, 711 10 Heraklion Crete, Greece
- Department of Materials Science and Technology, University of Crete, 710 03 Heraklion Crete, Greece
| | - W. Bras
- ESRF, DUBBLE CRG, Netherlands Organization for Scientific Research (NWO), F-38043 Grenoble, France
| | - S. H. Anastasiadis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, P.O. Box 1527, 711 10 Heraklion Crete, Greece
- Department of Chemistry, University of Crete, 710 03 Heraklion Crete, Greece
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Christodoulakis KE, Vamvakaki M. Amphoteric core-shell microgels: contraphilic two-compartment colloidal particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:639-647. [PMID: 19754064 DOI: 10.1021/la902231b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
pH-responsive amphoteric core-shell microgel particles were synthesized by emulsion copolymerization of the appropriate functional monomers with ethylene glycol dimethacrylate as the cross-linker. 2-(Diethylamino)ethyl methacrylate (DEA) was used as the ionizable basic monomer, and tert-butyl methacrylate served as the hydrophobic monomer precursor, which gave the methacrylic acid (MAA) moieties following acid hydrolysis of the ester groups. The core of the polyampholyte microgels comprised a cross-linked poly(2-(diethylamino)ethyl methacrylate) (PDEA) or poly(methacrylic acid) (PMAA) network surrounded by a cross-linked PMAA or PDEA shell, respectively. A polyampholyte random copolymer microgel with the DEA and MAA units randomly distributed within the gel phase was also prepared. Scanning electron microscopy studies showed spherical particles of a narrow size distribution, and transmission electron microscopy verified the core-shell topology of the particles. Potentiometric titration curves revealed two plateau regions for the polyampholyte core-shell microgels attributed to the independent ionization process of the core and the shell of the particles, in contrast to the random copolymer microgel particles that exhibited a single plateau region as a result of the simultaneous protonation/deprotonation process of the basic and acidic moieties of the microgels. The core and the shell of the particles were found to swell independently upon ionization of the DEA or MAA moieties at low or high pH, respectively, whereas collapsed latex particles were obtained in the intermediate pH range when both the core and the shell of the particles were neutral, in agreement with the potentiometric titration data. These core-shell microgels comprise novel two-compartment nanostructures that exhibit contraphilic properties in the core and the shell of the particles in response to a single external stimulus.
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Affiliation(s)
- Kostas E Christodoulakis
- Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas, P.O. Box 1527, 711 10 Heraklion, Crete, Greece
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Özkara S, Say R, Andaç C, Denizli A. An Ion-Imprinted Monolith for in Vitro Removal of Iron out of Human Plasma with Beta Thalassemia. Ind Eng Chem Res 2008. [DOI: 10.1021/ie071471y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Serpil Özkara
- Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey, Department of Chemistry, Anadolu University, Eskisehir, Turkey, and Department of Chemistry, Dicle University, Diyarbakir, Turkey
| | - Ridvan Say
- Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey, Department of Chemistry, Anadolu University, Eskisehir, Turkey, and Department of Chemistry, Dicle University, Diyarbakir, Turkey
| | - Cenk Andaç
- Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey, Department of Chemistry, Anadolu University, Eskisehir, Turkey, and Department of Chemistry, Dicle University, Diyarbakir, Turkey
| | - Adil Denizli
- Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey, Department of Chemistry, Anadolu University, Eskisehir, Turkey, and Department of Chemistry, Dicle University, Diyarbakir, Turkey
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Häntzschel N, Zhang F, Eckert F, Pich A, Winnik MA. Poly(N-vinylcaprolactam-co-glycidyl methacrylate) aqueous microgels labeled with fluorescent LaF3:Eu nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:10793-800. [PMID: 17854211 DOI: 10.1021/la701691g] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We describe the synthesis and properties of functional microgel particles based on poly(N-vinylcaprolactam-co-glycidyl methacrylate) (PVCL/PGMA) copolymer. A series of colloidally stable microgel particles with a range of glycidyl methacrylate content were prepared by surfactant-free heterophase polymerization in water. The microgel particles obtained had hydrodynamic radii between 250 and 350 nm and were fairly monodisperse in size; however, a broadening of the particle size distribution was observed for samples with a low GMA content. The PVCL/PGMA microgel particles exhibit thermally responsive reversible changes in diameter in water, and the swelling degree increased with the PVCL fraction in the copolymer structure. These microgels were then modified with photoluminescent europium-doped lanthanum fluoride nanoparticles (LaF3:Eu-AEP) through reaction of the 2-aminoethyl phosphate surface ligands with epoxy groups present in the microgel. These hybrid microgels were colloidally stable and thermally responsive in aqueous solution.
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Affiliation(s)
- Nadine Häntzschel
- Department of Macromolecular Chemistry and Textile Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
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Matsuura K, Masumoto K, Igami Y, Fujioka T, Kimizuka N. In Situ Observation of Spherical DNA Assembly in Water and the Controlled Release of Bound Dyes. Biomacromolecules 2007; 8:2726-32. [PMID: 17705427 DOI: 10.1021/bm070357w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three strands of 30-mer oligodeoxyribonucleotides (ODNs) were designed to form three-way junctions that possess self-complementary sticky ends. The morphology of self-assembled ODNs in water was observed in situ by confocal laser scanning fluorescence microscopy. The three-way junctions self-assembled into spherical assemblies, in accordance with transmission and scanning electron microscopy. The size of nucleospheres was in the range of several tens of nanometers to micrometers, which varied depending on the concentration of ODNs and added salts. Fluorescence images of spherical ODN assemblies suggested that the nucleospheres possess multiwalled structures. The fluorescence of sodium 1-anilinonaphthalene-8-sulfonate in the presence of nucleospheres revealed that the interior of nucleospheres possesses polarity corresponding to that between methanol and ethanol. A dye-inclusion experiment showed that cationic and even anionic dyes were adsorbed to the interior of the nucleospheres. The dye-included nucleospheres released dyes by thermal dissociation or digestion of the constituent ODNs.
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Affiliation(s)
- Kazunori Matsuura
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Moto-oka 744, Nishi-ku, Fukuoka 819-0395.
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Palioura D, Armes SP, Anastasiadis SH, Vamvakaki M. Metal nanocrystals incorporated within pH-responsive microgel particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:5761-8. [PMID: 17408293 DOI: 10.1021/la063359v] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Cross-linked sterically stabilized latexes of approximately 250 nm diameter were synthesized by emulsion polymerization of 2-(diethylamino)ethyl methacrylate using a bifunctional oligo(propylene oxide)-based diacrylate cross-linker and a poly(ethylene oxide)-based macromonomer as the stabilizer at pH 9. These particles exhibit reversible swelling properties in water by adjusting the solution pH. At low pH, they exist as swollen microgels as a result of protonation of the tertiary amine units. Deswelling occurs above pH 7 [the effective pK(a) of poly(2-(diethylamino)ethyl methacrylate)], leading to the formation of the original compact latex particles. The swollen microgels can be used as nanoreactors: efficient impregnation with Pt nanoparticles can be achieved by incorporating precursor platinum compounds, followed by metal reduction. Dynamic light scattering was used to compare two methods of Pt nanoparticle impregnation with respect to the size and stability of the final Pt-loaded microgel particles. In the first method, the H2PtCl6 precursor was added to hydrophobic latex particles at high pH, followed by metal reduction. In the second method, H2PtCl6 was added to hydrophilic swollen microgel particles at low pH, and then this metal salt was reduced in situ using NaBH4 and the pH was raised by the addition of base. Both the Pt salt-loaded (metalated) microgels and the final Pt nanoparticle-loaded microgels had well-defined structures that were independent of the synthesis route. Polymer-metal interactions were investigated by UV-visible absorption spectroscopy, which confirmed that the Pt salt was completely reduced to zero-valent Pt. Transmission electron microscopy and X-ray diffraction studies verified the formation of nanometer-sized Pt nanoparticles within these microgels, which can be used as recoverable colloidal catalyst supports for various organic reactions.
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Affiliation(s)
- D Palioura
- Institute of Electronic Structure and Laser, Foundation for Research and Technology--Hellas, P.O. Box 1527, 71110 Heraklion Crete, Greece
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Pich AZ, Adler HJP. Composite aqueous microgels: an overview of recent advances in synthesis, characterization and application. POLYM INT 2007. [DOI: 10.1002/pi.2142] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Yu S, Yao P, Jiang M, Zhang G. Nanogels prepared by self-assembly of oppositely charged globular proteins. Biopolymers 2006; 83:148-58. [PMID: 16718679 DOI: 10.1002/bip.20539] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Ovalbumin and lysozyme are two main proteins in hen egg white with the isoelectric points of 4.8 and 11, respectively. Herein we report the manufacture of stable, narrowly distributed nanogels (hydrodynamic radius about 100 nm) using a novel and convenient method: ovalbumin and lysozyme solutions were mixed at pH 5.3, the mixture solution was adjusted to pH 10.3, then subsequently stirred and heated. The nanogels were characterized using a combination of techniques. The nanogels have spherical shape and core-shell structure. The core is mainly composed of lysozyme and the shell is mainly composed of ovalbumin. The proteins in the nanogels are in denatured states and they are bound by intermolecular hydrophobic interactions, hydrogen bonds, and disulfide bonds. The charges of the nanogels can be modulated by the pH of the medium. The electrostatic repulsion of ovalbumin molecules on the nanogel surface stabilizes the nanogels in aqueous solution. The formation mechanism of the nanogels is discussed.
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Affiliation(s)
- Shaoyong Yu
- The Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China
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Saatçılar Ö, Şatıroğlu N, Say R, Bekta?? S, Denizli A. Binding behavior of Fe3+ ions on ion-imprinted polymeric beads for analytical applications. J Appl Polym Sci 2006. [DOI: 10.1002/app.24591] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Yavuz H, Say R, Denizli A. Iron removal from human plasma based on molecular recognition using imprinted beads. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2005. [DOI: 10.1016/j.msec.2005.04.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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