1
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Schlattmann D, Schönhoff M. Interplay of the Influence of Crosslinker Content and Model Drugs on the Phase Transition of Thermoresponsive PNiPAM-BIS Microgels. Gels 2022; 8:gels8090571. [PMID: 36135283 PMCID: PMC9498534 DOI: 10.3390/gels8090571] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/02/2022] [Accepted: 09/05/2022] [Indexed: 11/16/2022] Open
Abstract
The phase transition behavior of differently crosslinked poly(N-isopropylacrylamide)/N,N’-methylenebisacrylamide (PNiPAM/BIS) microgels with varying crosslinker content is investigated in presence of aromatic additives. The influence of meta-hydroxybenzaldehyde (m-HBA) and 2,4-dihydroxybenzaldehyde (2,4-DHBA), chosen as model drugs, on the volume phase transition temperature (VPTT) is analyzed by dynamic light scattering (DLS), differential scanning calorimetry (DSC), and 1H-NMR, monitoring and comparing the structural, calorimetric, and dynamic phase transition, respectively. Generally, the VPTT is found to increase with crosslinker content, accompanied by a drastic decrease of transition enthalpy. The presence of an additive generally decreases the VPTT, but with distinct differences concerning the crosslinker content. While the structural transition is most affected at lowest crosslinker content, the calorimetric and dynamic transitions are most affected for an intermediate crosslinker content. Additive uptake of the collapsed gel is largest for low crosslinked microgels and in case of large additive-induced temperature shifts. Furthermore, as temperature is successively raised, 1H NMR data, aided by spin relaxation rates, reveal an interesting uptake behavior, as the microgels act in a sponge-like fashion including a large initial uptake and a squeeze-out phase above VPTT.
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2
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Abstract
Hydrogels comprise a class of soft materials which are extremely useful in a number of contexts, for example as matrix-mimetic biomaterials for applications in regenerative medicine and drug delivery. One particular subclass of hydrogels consists of materials prepared through non-covalent physical crosslinking afforded by supramolecular recognition motifs. The dynamic, reversible, and equilibrium-governed features of these molecular-scale motifs often transcend length-scales to endow the resulting hydrogels with these same properties on the bulk scale. In efforts to engineer hydrogels of all types with more precise or application-specific uses, inclusion of stimuli-responsive sol-gel transformations has been broadly explored. In the context of biomedical uses, temperature is an interesting stimulus which has been the focus of numerous hydrogel designs, supramolecular or otherwise. Most supramolecular motifs are inherently temperature-sensitive, with elevated temperatures commonly disfavoring motif formation and/or accelerating its dissociation. In addition, supramolecular motifs have also been incorporated for physical crosslinking in conjunction with polymeric or macromeric building blocks which themselves exhibit temperature-responsive changes to their properties. Through molecular-scale engineering of supramolecular recognition, and selection of a particular motif or polymeric/macromeric backbone, it is thus possible to devise a number of supramolecular hydrogel materials to empower a variety of future biomedical applications.
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Affiliation(s)
- Sijie Xian
- Department of Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Matthew J Webber
- Department of Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA.
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3
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Okada S, Sato E. Thermo- and Photoresponsive Behaviors of Dual-Stimuli-Responsive Organogels Consisting of Homopolymers of Coumarin-Containing Methacrylate. Polymers (Basel) 2021; 13:polym13030329. [PMID: 33494152 PMCID: PMC7864332 DOI: 10.3390/polym13030329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 11/16/2022] Open
Abstract
Coumarin-containing vinyl homopolymers, such as poly(7-methacryloyloxycoumarin) (P1a) and poly(7-(2'-methacryloyloxyethoxy)coumarin) (P1b), show a lower critical solution temperature (LCST) in chloroform, which can be controlled by the [2 + 2] photochemical cycloaddition of the coumarin moiety, and they are recognized as monofunctional dual-stimuli-responsive polymers. A single functional group of monofunctional dual-stimuli-responsive polymers responds to dual stimuli and can be introduced more uniformly and densely than those of dual-functional dual-stimuli-responsive polymers. In this study, considering a wide range of applications, organogels consisting of P1a and P1b, i.e., P1a-gel and P1b-gel, respectively, were synthesized, and their thermo- and photoresponsive behaviors in chloroform were investigated in detail. P1a-gel and P1b-gel in a swollen state (transparent) exhibited phase separation (turbid) through a temperature jump and reached a shrunken state (transparent), i.e., an equilibrium state, over time. Moreover, the equilibrium degree of swelling decreased non-linearly with increasing temperature. Furthermore, different thermoresponsive sites were photopatterned on the organogel through the photodimerization of the coumarin unit. The organogels consisting of homopolymers of coumarin-containing methacrylate exhibited unique thermo- and photoresponsivities and behaved as monofunctional dual-stimuli-responsive organogels.
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Affiliation(s)
| | - Eriko Sato
- Correspondence: ; Tel./Fax: +81-6-6605-2982
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4
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Max JB, Nabiyan A, Eichhorn J, Schacher FH. Triple-Responsive Polyampholytic Graft Copolymers as Smart Sensors with Varying Output. Macromol Rapid Commun 2020; 42:e2000671. [PMID: 33368771 DOI: 10.1002/marc.202000671] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 11/27/2020] [Indexed: 12/20/2022]
Abstract
Three triggers result in two measurable outputs from polymeric sensors: multiresponsive polyampholytic graft copolymers respond to pH-value and temperature, as well as the type and concentration of metal cations and therefore, allow the transformation of external triggers into simply measurable outputs (cloud point temperature (TCP ) and surface plasmon resonance (SPR) of encapsulated silver nanoparticles). The synthesis relies on poly(dehydroalanine) (PDha) as the reactive backbone and gives straightforward access to materials with tunable composition and output. In particular, a rather high sensitivity toward the presence of Cu2+ , Co2+ , and Pb2+ metal cations is found.
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Affiliation(s)
- Johannes B Max
- Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Lessingstraße 8, Jena, 07743, Germany.,Jena Center for Soft Matter (JCSM), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany.,Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany
| | - Afshin Nabiyan
- Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Lessingstraße 8, Jena, 07743, Germany.,Jena Center for Soft Matter (JCSM), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany.,Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany
| | - Jonas Eichhorn
- Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Lessingstraße 8, Jena, 07743, Germany.,Jena Center for Soft Matter (JCSM), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany.,Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany
| | - Felix H Schacher
- Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Lessingstraße 8, Jena, 07743, Germany.,Jena Center for Soft Matter (JCSM), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany.,Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-Universität Jena, Philosophenweg 7, Jena, 07743, Germany
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5
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Capsule membranes encapsulated with smart nanogels for facile detection of trace lead(II) ions in water. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118523] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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6
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Wang Y, Liu Z, Luo F, Peng HY, Zhang SG, Xie R, Ju XJ, Wang W, Faraj Y, Chu LY. A novel smart membrane with ion-recognizable nanogels as gates on interconnected pores for simple and rapid detection of trace lead(II) ions in water. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.01.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Liang S, Guan Y, Zhang Y. Layer-by-Layer Assembly of Microgel Colloidal Crystals via Photoinitiated Alkyne-Azide Click Reaction. ACS OMEGA 2019; 4:5650-5660. [PMID: 31459719 PMCID: PMC6647982 DOI: 10.1021/acsomega.9b00354] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 02/21/2019] [Indexed: 05/22/2023]
Abstract
Layer-by-layer (LBL) assembly of colloidal crystals (CCs) allows for the fine control of the thickness and architecture of the resulting crystals. Various methods have been developed for the LBL assembly of CCs of hard spheres. However, these methods are inapplicable for microgel CCs owing to the softness and deformability of microgel spheres. In this study, a method was proposed for the LBL assembly of microgel CCs. To build the first monolayer, azide-modified microgel spheres were assembled into a three-dimensional (3D) CC. The first 111 plane of the 3D CC close to the substrate was then fixed in situ onto the substrate via photoinitiated alkyne-azide click reaction between the azide groups on the microgels and the alkyne groups on the substrate surface. The removal of unbonded particles resulted in a microgel monolayer with a high degree of order. The second monolayer was assembled in a similar manner, i.e., a 3D microgel CC was initially assembled followed by in situ fixation of the first 111 plane of the 3D crystal with the underlying microgel monolayer by photoinitiated alkyne-azide click reaction. For this purpose, instead of azide-modified microgel spheres, alkyne-modified microgel spheres were used for the assembly of the second layer. Confocal studies confirmed that the second monolayer was located on top of the first layer. When the lattice constant of the 3D CC approximated that of the underlying microgel monolayer, the second monolayer exhibited a high degree of order. Repeating this process led to alternating deposition of highly ordered monolayers of azide-modified and alkyne-modified microgels onto the substrate. Similar to the microgel CCs obtained by the self-assembly of microgel spheres in bulky dispersions, face-centered cubic and hexagonal-close-packed structures also coexisted in the LBL-assembled microgel CCs.
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Affiliation(s)
- Shuang Liang
- Key
Laboratory of Functional Polymer Materials and State Key Laboratory
of Medicinal Chemical Biology, Institute of Polymer Chemistry, College
of Chemistry and Collaborative Innovation Center of Chemical Science and Engineering
(Tianjin), Nankai University, Tianjin 300071, China
| | - Ying Guan
- Key
Laboratory of Functional Polymer Materials and State Key Laboratory
of Medicinal Chemical Biology, Institute of Polymer Chemistry, College
of Chemistry and Collaborative Innovation Center of Chemical Science and Engineering
(Tianjin), Nankai University, Tianjin 300071, China
| | - Yongjun Zhang
- Key
Laboratory of Functional Polymer Materials and State Key Laboratory
of Medicinal Chemical Biology, Institute of Polymer Chemistry, College
of Chemistry and Collaborative Innovation Center of Chemical Science and Engineering
(Tianjin), Nankai University, Tianjin 300071, China
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8
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Effect of entanglements on temperature response of gel immobilized microgel photonic crystals. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.09.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Wang Y, Liu Z, Peng HY, He F, Zhang L, Faraj Y, Wang W, Ju XJ, Xie R, Chu LY. A Simple Device Based on Smart Hollow Microgels for Facile Detection of Trace Lead(II) Ions. Chemphyschem 2018. [PMID: 29539212 DOI: 10.1002/cphc.201800138] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A simple device, which is equipped with a non-woven fabric filter medium immobilized with ion-recognizable smart hollow microgels, is developed for facile detection of trace lead(II) ions (Pb2+ ). The ion-recognizable smart microgels are made of poly(N-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) (PNB), in which the 18-crown-6 groups act as the sensors of Pb2+ and the N-isopropylacrylamide groups act as the actuators. The PNB hollow microgels can isothermally change from a shrunk state to a swollen state in response to recognizing Pb2+ in the aqueous environment due to the electrostatic repulsion among the charged 18-crown-6/Pb2+ complex groups and the enhancement of hydrophilicity of the microgels. Due to the hollow structures, the PNB microgels show remarkable isothermal swelling ratio. Thus, the flux of solution pass through the non-woven fabric filter medium decreases significantly because of the remarkable reduction in the space for liquid flowing upon recognizing Pb2+ . The Pb2+ concentration can be detected quantitatively by simply and easily measuring the change of solution flux using the proposed device, which is operated without external power supply or spectroscopic measurements. The strategy proposed in this study provides a promising method for facile detection of trace Pb2+ in aqueous environments.
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Affiliation(s)
- Yuan Wang
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Zhuang Liu
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Han-Yu Peng
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Fan He
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Lei Zhang
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Yousef Faraj
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Wei Wang
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Xiao-Jie Ju
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Rui Xie
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Liang-Yin Chu
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
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10
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Study of N-isopropylacrylamide-based microgel particles as a potential drug delivery agents. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.07.075] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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11
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Igwe IE, Zong Y, Yang X, Ouyang Z, Chen K. Induced Attraction between Polystyrene Colloidal Particles in a Binary Mixture with PNIPAM Colloidal Microgels. J Phys Chem B 2017; 121:5391-5395. [PMID: 28467075 DOI: 10.1021/acs.jpcb.6b12999] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate the phase behaviors of binary mixtures of polystyrene (PS) hard-sphere and poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM) soft-sphere colloidal particles as a function of temperature. As the temperature increases, apparent attractions arise between the PS particles, to the point of clustering at the highest temperature. This attractive force is found to be due to the change in pH caused by the acrylic acid co-polymerized with the temperature-sensitive PNIPAM particles, which in turn collapses the sterical stabilizing surface layers on the PS particles. Our experiments provide a new way to tune colloidal interactions with temperature for particles that are otherwise insensitive to temperature variations.
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Affiliation(s)
- Isaiah E Igwe
- Institute of Theoretical Physics, Chinese Academy of Sciences , Zhong Guan Cun East Street 55 #, P.O. Box 2735, Beijing 100190, P. R. China.,School of Physical Sciences, University of Chinese Academy of Sciences , 19A Yuquan Road, Shijingshan District, Beijing 100049, P. R. China
| | - Yiwu Zong
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese of Academy of Sciences , Beijing 100190, P. R. China
| | - Xiunan Yang
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese of Academy of Sciences , Beijing 100190, P. R. China
| | - Zhongcan Ouyang
- Institute of Theoretical Physics, Chinese Academy of Sciences , Zhong Guan Cun East Street 55 #, P.O. Box 2735, Beijing 100190, P. R. China
| | - Ke Chen
- Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese of Academy of Sciences , Beijing 100190, P. R. China
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12
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Temperature-driven volume phase transition of a single stimuli-responsive microgel particle using optical tweezers. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-016-3952-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Nebhani L, Choudhary V, Adler HJP, Kuckling D. pH- and Metal Ion- Sensitive Hydrogels based on N-[2-(dimethylaminoethyl)acrylamide]. Polymers (Basel) 2016; 8:E233. [PMID: 30979328 PMCID: PMC6432260 DOI: 10.3390/polym8060233] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 05/12/2016] [Accepted: 06/06/2016] [Indexed: 11/16/2022] Open
Abstract
Smart hydrogels are promising materials for actuators and sensors, as they can respond to small changes in their environment with a large property change. Hydrogels can respond to a variety of stimuli, for example temperature, pH, metal ions, etc. In this article, the synthesis and characterization of polyampholyte hydrogels based on open chain ligands showing pH and metal ion sensitivity are described. Copolymer and terpolymer gels using different mixtures of monomers i.e., N-[2-(dimethylaminoethyl)acrylamide] (DMAEAAm), N,N-dimethylacrylamide (DMAAm), acrylic acid (AA) and 2-acrylamido-2-methyl-1-propanesulphonic acid (AMPS), have been synthesized. The effect of copolymer composition, i.e., the ratio and amount of ionic monomers and the degree of crosslinking on the swelling characteristics, was evaluated as a function of pH. On this basis, metal ion sensitivity measurements were performed at selected pH values. The metal ion sensitivity was measured by varying the concentration of Cu2+, Zn2+ and Ag⁺ ions under acidic pH conditions.
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Affiliation(s)
- Leena Nebhani
- Centre for Polymer Science and Engineering, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India.
| | - Veena Choudhary
- Centre for Polymer Science and Engineering, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India.
| | - Hans-Jürgen P Adler
- Institute for Macromolecular Chemistry and Textile Chemistry, Dresden University of Technology, D-01062 Dresden, Germany.
| | - Dirk Kuckling
- Chemistry Department, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany.
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14
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Ajmal M, Demirci S, Siddiq M, Aktas N, Sahiner N. Simultaneous catalytic degradation/reduction of multiple organic compounds by modifiable p(methacrylic acid-co-acrylonitrile)–M (M: Cu, Co) microgel catalyst composites. NEW J CHEM 2016. [DOI: 10.1039/c5nj02298c] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The reactants easily diffuse into a microgel network, adsorb at the surface of catalyst nanoparticles and reduce in the presence of reducing agents.
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Affiliation(s)
- Muhammad Ajmal
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad 45320
- Pakistan
| | - Sahin Demirci
- Canakkale Onsekiz Mart University
- Faculty of Science & Arts
- Chemistry Department
- 17100 Canakkale
- Turkey
| | - Mohammad Siddiq
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad 45320
- Pakistan
| | - Nahit Aktas
- Chemical Engineering Departments
- Yuzuncu Yil University
- Van
- Turkey
| | - Nurettin Sahiner
- Canakkale Onsekiz Mart University
- Faculty of Science & Arts
- Chemistry Department
- 17100 Canakkale
- Turkey
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15
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Yang Y, Zhao Y, Yan Y, Wang Y, Guo C, Zhang J. Preparation of AgCl Nanocubes and Their Application as Efficient Photoinitiators in the Polymerization of N-Isopropylacrylamide. J Phys Chem B 2015; 119:14807-13. [DOI: 10.1021/acs.jpcb.5b06791] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ying Yang
- Institute
of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Yan Zhao
- Institute
of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Yukun Yan
- Institute
of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Yanli Wang
- Institute
of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Changyou Guo
- Institute
of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Jinsong Zhang
- Institute
of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
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16
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Ochi M, Ida J, Matsuyama T, Yamamoto H. Effect of synthesis temperature on characteristics of PNIPAM/alginate IPN hydrogel beads. J Appl Polym Sci 2014. [DOI: 10.1002/app.41814] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Masanori Ochi
- Faculty of Engineering, Department of Environmental Engineering for Symbiosis, Faculty of Engineering; Soka University; 1-236 Tangi-cho, Hachioji Tokyo 192-8577 Japan
| | - Junichi Ida
- Faculty of Engineering, Department of Environmental Engineering for Symbiosis, Faculty of Engineering; Soka University; 1-236 Tangi-cho, Hachioji Tokyo 192-8577 Japan
| | - Tatsushi Matsuyama
- Faculty of Engineering, Department of Environmental Engineering for Symbiosis, Faculty of Engineering; Soka University; 1-236 Tangi-cho, Hachioji Tokyo 192-8577 Japan
| | - Hideo Yamamoto
- Faculty of Engineering, Department of Environmental Engineering for Symbiosis, Faculty of Engineering; Soka University; 1-236 Tangi-cho, Hachioji Tokyo 192-8577 Japan
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17
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Wu Y, Zhao Z, Guan Y, Zhang Y. Galactosylated reversible hydrogels as scaffold for HepG2 spheroid generation. Acta Biomater 2014; 10:1965-74. [PMID: 24382516 DOI: 10.1016/j.actbio.2013.12.044] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 11/28/2013] [Accepted: 12/18/2013] [Indexed: 01/08/2023]
Abstract
Various galactosylated scaffolds have been developed for hepatocyte culture because galactose ligands help maintain cell viability, facilitate the formation of multicellular spheroids and help maintain a high level of liver-specific functions. However, it is difficult to harvest the cell spheroids generated inside the three-dimensional scaffolds for their further biological analysis and applications. Here we developed a new galactosylated hydrogel scaffold which solidifies in situ upon heating to physiological temperature, but liquefies again upon cooling back to room temperature. The new scaffold is composed of poly(N-isopropylacrylamide) (PNIPAM) microgel and poly(ethylene glycol) (PEG). Because of the thermosensitivity of PNIPAM microgel, the mixed dispersions gel upon heating and liquefy upon cooling. PEG was added to reduce the shrinkage of the gels. Part of the PNIPAM microgel was replaced with a galactosylated one to provide a series of blend gels with various galactose ligand contents. HepG2 cells, a human hepatocarcinoma cell line, were encapsulated in the in situ-formed gels. As expected, the cell viability increases with increasing content of galactose ligands. In addition, compact multicellular spheroids were obtained in gels containing galactose ligands, while loose spheroids formed in gel without galactose ligands. The cells cultured in galactose-containing gels also exhibit a higher level of liver-specific functions, in terms of both albumin secretion and urea synthesis, than those cultured in gel without these ligands. The new galactosylated scaffold not only promotes the formation of hepatocyte spheroids, but also allows for their harvest. By cooling back to room temperature to liquefy the gel, the hepatocyte spheroids can be facilely harvested from the scaffold. The reversible galactosylated scaffold developed here may be used for large scale fabrication of hepatocyte spheroids.
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18
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Wang YM, Ju XJ, Liu Z, Xie R, Wang W, Wu JF, Zhang YQ, Chu LY. Competitive Molecular-/Ion-Recognition Responsive Characteristics of Poly(N-isopropylacrylamide-co-benzo-12-crown-4-acrylamide) Copolymers with Benzo-12-crown-4 as Both Guest and Host Units. Macromol Rapid Commun 2014; 35:1280-6. [DOI: 10.1002/marc.201400054] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 03/16/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Yin-Mei Wang
- School of Chemical Engineering; Sichuan University; Chengdu Sichuan 610065 China
| | - Xiao-Jie Ju
- School of Chemical Engineering; Sichuan University; Chengdu Sichuan 610065 China
| | - Zhuang Liu
- School of Chemical Engineering; Sichuan University; Chengdu Sichuan 610065 China
| | - Rui Xie
- School of Chemical Engineering; Sichuan University; Chengdu Sichuan 610065 China
| | - Wei Wang
- School of Chemical Engineering; Sichuan University; Chengdu Sichuan 610065 China
| | - Jiang-Feng Wu
- Medical College; China Three Gorges University; Yichang Hubei 443002 China
| | - Yan-Qiong Zhang
- Medical College; China Three Gorges University; Yichang Hubei 443002 China
| | - Liang-Yin Chu
- School of Chemical Engineering; Sichuan University; Chengdu Sichuan 610065 China
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19
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Tang Z, Guan Y, Zhang Y. Contraction-type glucose-sensitive microgel functionalized with a 2-substituted phenylboronic acid ligand. Polym Chem 2014. [DOI: 10.1039/c3py01190a] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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20
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Synthesis of micrometer-size poly(N-isopropylacrylamide) microgel particles with homogeneous crosslinker density and diameter control. J Colloid Interface Sci 2013; 405:96-102. [DOI: 10.1016/j.jcis.2013.05.042] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 04/13/2013] [Accepted: 05/17/2013] [Indexed: 11/18/2022]
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Liu YM, Wang W, Zheng WC, Ju XJ, Xie R, Zerrouki D, Deng NN, Chu LY. Hydrogel-based microactuators with remote-controlled locomotion and fast Pb2+-response for micromanipulation. ACS APPLIED MATERIALS & INTERFACES 2013; 5:7219-26. [PMID: 23865475 DOI: 10.1021/am401570k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Hydrogel-based microactuators that enable remote-controlled locomotion and fast Pb(2+)-response for micromanipulation in Pb(2+)-polluted microenvironment have been fabricated from quadruple-component double emulsions. The microactuators are Pb(2+)-responsive poly(N-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) microgels, each with an eccentric magnetic core for magnetic manipulation and a hollow cavity for fast Pb(2+)-response. Micromanipulation of the microactuators is demonstrated by using them for preventing Pb(2+)-leakage from microchannel. The microactuators can be remotely and precisely transported to the Pb(2+)-leaking site under magnetic guide, and then clog the microchannel with Pb(2+)-responsive volume swelling to prevent flowing out of Pb(2+)-contaminated solution. The proposed microactuator structure provides a potential and novel model for developing multifunctional actuators and sensors, biomimetic soft microrobots, microelectro-mechanical systems and drug delivery systems.
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Affiliation(s)
- Ying-Mei Liu
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, P. R. China
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Chhabra A, Kanapuram RR, Kim TJ, Geng J, da Silva AK, Bielawski CW, Hidrovo CH. Humidity effects on the wetting characteristics of poly(N-isopropylacrylamide) during a lower critical solution transition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8116-8124. [PMID: 23701452 DOI: 10.1021/la401072d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Poly(N-isopropylacrylamide) (PNIPAM) is expected to find utility in tissue engineering and drug delivery, among other biomedical applications. These applications capitalize on the intrinsic lower critical solution temperature (LCST) of the polymer: below the LCST, enthalpic gain from intermolecular hydrogen bonding between PNIPAM and water molecules dominates the solvation; above the LCST, entropic effects resulting from the intramolecular hydrogen bonding between the carboxyl and amide groups of PNIPAM lead to water expulsion. The dependence of the LCST upon the molecular weight, solvent, and solution activity (i.e., solute concentration) has been studied extensively. However, what has not been previously explored is the effect of humidity on the characteristic properties of the polymer. Herein, we show that the relative humidity affects the water adsorption dynamics of PNIPAM as well as the magnitude of the transition that occurs at the LCST of the polymer. In short, the magnitude of the LCST transition decreases with an increasing relative humidity, and the time period over which adsorption occurs decreases with the temperature.
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Affiliation(s)
- Arnav Chhabra
- Department of Mechanical Engineering, The University of Texas at Austin, 204 East Dean Keeton Street, Austin, Texas 78712, USA
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Döring A, Birnbaum W, Kuckling D. Responsive hydrogels--structurally and dimensionally optimized smart frameworks for applications in catalysis, micro-system technology and material science. Chem Soc Rev 2013; 42:7391-420. [PMID: 23677178 DOI: 10.1039/c3cs60031a] [Citation(s) in RCA: 255] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Although the technological and scientific importance of functional polymers has been well established over the last few decades, the most recent focus that has attracted much attention has been on stimuli-responsive polymers. This group of materials is of particular interest due to its ability to respond to internal and/or external chemico-physical stimuli, which is often manifested as large macroscopic responses. Aside from scientific challenges of designing stimuli-responsive polymers, the main technological interest lies in their numerous applications ranging from catalysis through microsystem technology and chemomechanical actuators to sensors that have been extensively explored. Since the phase transition phenomenon of hydrogels is theoretically well understood advanced materials based on the predictions can be prepared. Since the volume phase transition of hydrogels is a diffusion-limited process the size of the synthesized hydrogels is an important factor. Consistent downscaling of the gel size will result in fast smart gels with sufficient response times. In order to apply smart gels in microsystems and sensors, new preparation techniques for hydrogels have to be developed. For the up-coming nanotechnology, nano-sized gels as actuating materials would be of great interest.
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Affiliation(s)
- Artjom Döring
- Chemistry Department, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
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Zhang Y, Liu K, Guan Y, Zhang Y. Assembling of gold nanorods on P(NIPAM–AAPBA) microgels: a large shift in the plasmon band and colorimetric glucose sensing. RSC Adv 2012. [DOI: 10.1039/c2ra20466e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Lee YF, Huang CC. Colorimetric assay of lead ions in biological samples using a nanogold-based membrane. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2747-2754. [PMID: 21699213 DOI: 10.1021/am200535s] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have developed a simple paper-based colorimetric membrane for sensing lead ions (Pb(2+)) in aqueous solutions. The nitrocellulose membrane (NCM) was used to trap bovine serum albumin (BSA) modified 13.3-nm Au nanoparticles (BSA-Au NPs), leading to the preparation of a nanocomposite film of a BSA-Au NP-decorated membrane (BSA-Au NPs/NCM). The BSA-Au NPs/NCM operates on the principle that Pb(2+) ions accelerate the rate of leaching of Au NPs induced by thiosulfate (S(2)O(3)(2-)) and 2-mercaptoethanol (2-ME). The BSA-Au NPs/NCM allowed for the detection of Pb(2+) by the naked eye in nanomolar aqueous solutions in the presence of leaching agents such as S(2)O(3)(2-) and 2-ME. We employed the assistance of microwave irradiation to shorten the reaction time (<10 min) for leaching the Au NPs. Under optimal solution conditions (5 mM glycine-NaOH (pH 10), S(2)O(3)(2-) (100 mM), and 2-ME (250 mM), microwaves (450 W)), the BSA-Au NPs/NCM allowed the detection of Pb(2+) at concentrations as low as 50 pM with high selectivity (at least 100-fold over other metal ions). This cost-effective sensing system allowed for the rapid and simple determination of the concentrations of Pb(2+) ions in real samples (in this case, sea water, urine, and blood samples).
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Affiliation(s)
- Yen-Fei Lee
- Institute of Bioscience and Biotechnology, National Taiwan Ocean University, 2, Beining Road, Keelung 20224, Taiwan
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Highly charged p(4-vinylpyridine-co-vinylimidazole) particles for versatile applications: Biomedical, catalysis and environmental. REACT FUNCT POLYM 2011. [DOI: 10.1016/j.reactfunctpolym.2011.03.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Xing S, Guan Y, Zhang Y. Kinetics of Glucose-Induced Swelling of P(NIPAM-AAPBA) Microgels. Macromolecules 2011. [DOI: 10.1021/ma200586w] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shuying Xing
- State Key Laboratory of Medicinal Chemical Biology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ying Guan
- State Key Laboratory of Medicinal Chemical Biology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yongjun Zhang
- State Key Laboratory of Medicinal Chemical Biology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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Nagai D, Suzuki A, Maki Y, Takeno H. Reversible chain association/dissociation via a CO2 responsive crosslinking/decrosslinking system. Chem Commun (Camb) 2011; 47:8856-8. [DOI: 10.1039/c1cc12084k] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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