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Chaudhary G, Ghosh A, Kang JG, Braun PV, Ewoldt RH, Schweizer KS. Linear and nonlinear viscoelasticity of concentrated thermoresponsive microgel suspensions. J Colloid Interface Sci 2021; 601:886-898. [PMID: 34186277 DOI: 10.1016/j.jcis.2021.05.111] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/26/2021] [Accepted: 05/19/2021] [Indexed: 11/25/2022]
Abstract
We present an integrated experimental and theoretical study of the dynamics and rheology of self-crosslinked, slightly charged, temperature responsive soft poly(N-isopropylacrylamide) (pNIPAM) microgels over a wide range of concentration and temperature spanning the sharp change in particle size and intermolecular interactions across the lower critical solution temperature (LCST). Dramatic, non-monotonic changes in viscoelasticity are observed as a function of temperature, with distinct concentration dependence in the dense fluid, glassy, and soft-jammed regimes. Motivated by our experimental observations, we formulate a minimalistic model for the size dependence of a single microgel particle and the change of the interparticle interaction from purely repulsive to attractive upon heating. Using microscopic equilibrium and time-dependent statistical mechanical theories, theoretical predictions are quantitatively compared with experimental measurements of the shear modulus. Good agreement is found for the nonmonotonic temperature behavior that originates as a consequence of the competition between reduced microgel packing fraction and increasing interparticle attractions. Testable predictions are made for nonlinear rheological properties such as the yield stress and strain. To our knowledge, this is the first attempt to quantitatively understand in a unified manner the viscoelasticity of dense, temperature-responsive microgel suspensions spanning a wide range of temperatures and concentrations.
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Affiliation(s)
- Gaurav Chaudhary
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Ashesh Ghosh
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Jin Gu Kang
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Paul V Braun
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Randy H Ewoldt
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Kenneth S Schweizer
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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2
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Narang P, Venkatesu P. Efficacy of several additives to modulate the phase behavior of biomedical polymers: A comprehensive and comparative outlook. Adv Colloid Interface Sci 2019; 274:102042. [PMID: 31677492 DOI: 10.1016/j.cis.2019.102042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/30/2019] [Accepted: 09/30/2019] [Indexed: 01/26/2023]
Abstract
Several new classes of polymeric materials are being introduced with unique properties. Thermoresponsive polymers (TRPs) are one of the most fascinating and emerging class of biomaterials in biomedical research. The design of TRPs with good response to temperature and its ability to exhibit coil to globular transition behavior near to physiological temperature made them more promising materials in the field of biomaterials and biomedicines. Instead of numerous studies on TRPs, the mechanistic interplay among several additives and TRPs is still not understood clearly and completely. The lack of complete understanding of biomolecular interactions of various additives with TRPs is limiting their applications in interdisciplinary science as well as pharmaceutical industry. There is a great need to provide a collective and comprehensive information of various additives and their behavior on widely accepted biopolymers, TRPs such as poly(N-isopropylacrylamide) (PNIPAM), poly(vinyl methyl ether) (PVME), poly(N-vinylcaprolactum) (PVCL) and poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) in aqueous solution. Obviously, as the literature on the influence of various additives on TRPs is very vast, therefore we focus our review only on these four selected TRPs. Additives such as polyols, methylamines, surfactants and denaturants basically made the significant changes in water structure associated to polymer via their entropy variation which is the direct influence of their directly or indirectly binding abilities. Eventually, this review addresses a brief overview of the most recent literature of applications based phase behavior of four selected TRPs in response to external stimuli. The work enhances the knowledge for use of TRPs in the advanced development of drug delivery system and in many more pharmaceutical applications. These kinds of studies provide powerful impact in exploring the utility range of polymeric materials in various field of science.
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Affiliation(s)
- Payal Narang
- Department of Chemistry, University of Delhi, Delhi 110007, India
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3
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You K, Wen G, Skandalis A, Pispas S, Yang S. Anion Specificity Effects on the Interfacial Aggregation Behavior of Poly(lauryl acrylate)- block-poly( N-isopropylacrylamide). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9904-9911. [PMID: 31282165 DOI: 10.1021/acs.langmuir.9b01561] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Aggregation behavior of an amphiphilic diblock copolymer poly(lauryl acrylate)-block-poly(N-isopropylacrylamide) (PLA-b-PNIPAM) on neutral aqueous subphases with different salt species and salt concentrations, as well as the structures of its Langmuir-Blodgett (LB) films, were systematically studied. The presence of NaCl or Na2SO4 in subphases makes PNIPAM chains shrink on the water surface and reduce their solubility underwater. On the contrary, the presence of NaNO3 or NaSCN makes PNIPAM chains more stretched on water and increase their solubility underwater, whose stretch degree and solubility both increase with the increase of salt concentration. Solubility of PNIPAM chains in the above subphase solutions is ranked as NaSCN ≫ NaNO3 > pure H2O > NaCl ≈ Na2SO4, which is almost consistent with the Hofmeister series except for the latter two close cases. All the initial LB films of PLA-b-PNIPAM exhibit tiny isolated circular micelles. Upon compression, the LB films in the case of pure H2O exhibit the dense mixed structures of circular micelles and wormlike aggregates. The formation of wormlike aggregates is due to connection of some adjoining cores, which is less possible in other subphase cases because of the conformation difference of PNIPAM chains.
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Affiliation(s)
- Kun You
- Department of Polymer Materials and Engineering, College of Material Science and Engineering , Harbin University of Science and Technology , 4 Linyuan Road , Harbin 150040 , PR China
| | - Gangyao Wen
- Department of Polymer Materials and Engineering, College of Material Science and Engineering , Harbin University of Science and Technology , 4 Linyuan Road , Harbin 150040 , PR China
| | - Athanasios Skandalis
- Theoretical and Physical Chemistry Institute , National Hellenic Research Foundation , 48 Vassileos Constantinou Avenue , Athens 11635 , Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute , National Hellenic Research Foundation , 48 Vassileos Constantinou Avenue , Athens 11635 , Greece
| | - Shicheng Yang
- Department of Polymer Materials and Engineering, College of Material Science and Engineering , Harbin University of Science and Technology , 4 Linyuan Road , Harbin 150040 , PR China
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4
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Guo Y, Belgodere JA, Ma Y, Jung JP, Bharti B. Directed Printing and Reconfiguration of Thermoresponsive Silica‐pNIPAM Nanocomposites. Macromol Rapid Commun 2019; 40:e1900191. [DOI: 10.1002/marc.201900191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 05/25/2019] [Indexed: 01/19/2023]
Affiliation(s)
- Yusheng Guo
- Cain Department of Chemical Engineering Louisiana State University Baton Rouge LA 70803 USA
| | - Jorge A. Belgodere
- Department of Biological Engineering Louisiana State University Baton Rouge LA 70803 USA
| | - Yingzhen Ma
- Cain Department of Chemical Engineering Louisiana State University Baton Rouge LA 70803 USA
| | - Jangwook P. Jung
- Department of Biological Engineering Louisiana State University Baton Rouge LA 70803 USA
| | - Bhuvnesh Bharti
- Cain Department of Chemical Engineering Louisiana State University Baton Rouge LA 70803 USA
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5
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Murdoch TJ, Humphreys BA, Johnson EC, Webber GB, Wanless EJ. Specific ion effects on thermoresponsive polymer brushes: Comparison to other architectures. J Colloid Interface Sci 2018; 526:429-450. [DOI: 10.1016/j.jcis.2018.04.086] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 02/06/2023]
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6
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The role of copolymer composition on the specific ion and thermo-response of ethylene glycol-based brushes. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.01.053] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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7
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Sedghi R, Yassari M, Heidari B. Thermo-responsive molecularly imprinted polymer containing magnetic nanoparticles: Synthesis, characterization and adsorption properties for curcumin. Colloids Surf B Biointerfaces 2017; 162:154-162. [PMID: 29190466 DOI: 10.1016/j.colsurfb.2017.11.053] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 10/12/2017] [Accepted: 11/21/2017] [Indexed: 01/30/2023]
Abstract
A novel intelligent thermoresponsive-magnetic molecularly imprinted polymer (TMMIP) nanocomposite based on N-isopropylacrylamide (NIPAM) & Fe3O4 was designed for the controlled & sustained release of Curcumin (CUR) with the ability to response external stimulus. The TMMIP nanocomposite was prepared using acryl functionalized β-cyclodextrin (β-CD) and NIPAM as functional monomers and CUR as target molecule. The recognition cavities which caused by host-guest interactions had direct influence to enhanced drug loading and sustained release of CUR. According to in-vitro release experiment in two different temperatures (below & above LCST of NIPAM) the prolonged & controlled release of CUR were observed. The release rate could be controlled by changing the temperature because of the phase transition behavior of NIPAM monomer. Also, the proposed biosensor displayed effective role in separation science, reasonable adsorption capacity (77mgg-1), fast recognition (10min equilibration), selective extraction toward CUR in the presence of structural analogues and easily separation using external magnetic field. Moreover, the synthesized TMMIP was confirmed by various characterization.
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Affiliation(s)
- Roya Sedghi
- Department of Polymer & Materials Chemistry, Faculty of Chemistry & Petroleum Sciences, Shahid Beheshti University, G.C, 1983969411, Tehran, Iran.
| | - Mehrasa Yassari
- Department of Polymer & Materials Chemistry, Faculty of Chemistry & Petroleum Sciences, Shahid Beheshti University, G.C, 1983969411, Tehran, Iran
| | - Bahareh Heidari
- Department of Polymer & Materials Chemistry, Faculty of Chemistry & Petroleum Sciences, Shahid Beheshti University, G.C, 1983969411, Tehran, Iran
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8
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Strandman S, Vachon R, Dini M, Giasson S, Zhu XX. Polyacrylamides revisited: flocculation of kaolin suspensions and mature fine tailings. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.22940] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Satu Strandman
- Department of Chemistry; Université de Montréal; C.P. 6128 succursale Centre-ville Montréal, QC, H3C 3J7 Canada
| | - Rémi Vachon
- Department of Chemistry; Université de Montréal; C.P. 6128 succursale Centre-ville Montréal, QC, H3C 3J7 Canada
| | - Maryam Dini
- Department of Chemistry; Université de Montréal; C.P. 6128 succursale Centre-ville Montréal, QC, H3C 3J7 Canada
| | - Suzanne Giasson
- Department of Chemistry; Université de Montréal; C.P. 6128 succursale Centre-ville Montréal, QC, H3C 3J7 Canada
| | - X. X. Zhu
- Department of Chemistry; Université de Montréal; C.P. 6128 succursale Centre-ville Montréal, QC, H3C 3J7 Canada
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9
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Lazzara G, Campbell RA, Bayati S, Zhu K, Nyström B, Nylander T, Schillén K. On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin. Colloid Polym Sci 2017; 295:1327-1341. [PMID: 28794578 PMCID: PMC5519650 DOI: 10.1007/s00396-017-4052-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 02/08/2017] [Accepted: 02/14/2017] [Indexed: 11/08/2022]
Abstract
The thermal responsive behavior of adsorbed layers of diblock copolymers of poly(N-isopropylacrylamide) (PNIPAAM) and poly((3-acrylamidopropyl)trimethylammonium chloride) (PAMPTMA(+)) with γ-cyclodextrin (γ-CD) at the solid/liquid interface has been investigated using three in situ techniques: null ellipsometry, quartz-crystal microbalance with dissipation monitoring, and neutron reflectometry. The measurements provided information about the adsorbed amounts, the layer thickness, hydration and viscoelastic properties, and the interfacial structure and composition. The copolymers adsorb to silica with the cationic PAMPTMA(+) blocks sitting as anchors in a flat conformation and the PNIPAAM chains extending into the solution. The copolymer system alone exhibits reversible collapse above the lower critical solution temperature of PNIPAAM. The addition of γ-CD to pre-adsorbed copolymer layers results in a highly extended conformation as well as some loss of copolymer from the surface, which we discuss in terms of the formation of surface-invoked lateral steric repulsion of formed inclusion complexes.
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Affiliation(s)
- Giuseppe Lazzara
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, 90128 Palermo, IT Italy
| | | | - Solmaz Bayati
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- Akzo Nobel Surface Chemistry AB, Stenunge Allé 3, SE-444 85 Stenungsund, Sweden
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Tommy Nylander
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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10
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Ng WS, Connal LA, Forbes E, Mohanarangam K, Franks GV. In situ investigation of aggregate sizes formed using thermo-responsive polymers: Effect of temperature and shear. J Colloid Interface Sci 2017; 494:139-152. [PMID: 28157632 DOI: 10.1016/j.jcis.2017.01.067] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/19/2017] [Accepted: 01/19/2017] [Indexed: 01/30/2023]
Abstract
Temperature-responsive flocculants, such as poly(N-isopropylacrylamide) (PNIPAM), induce reversible particle aggregation upon heating above a lower critical solution temperature (LCST). The aim of this work is to investigate the aggregation of ground iron ore using PNIPAM and conventional polyacrylamide (PAM) flocculants in a continuously-sheared suspension, through in situ chord length measurements using Focused Beam Reflectance Measurement techniques and real-time imaging of the particle aggregates. In the presence of uncharged PNIPAM, particle aggregation occurs only upon heating to the LCST, and the aggregates continue to grow with further heating. Subsequent cooling re-disperses the aggregates, and repeated heating causes reformation. Unlike uncharged PNIPAM, anionic PNIPAM produces aggregates at temperatures below the LCST due to the polymer chains binding to two different particles via attractive interactions between the acrylic acid groups and the hematite surfaces, and can be added at temperatures above the LCST due to the formation of charge-stabilised micelles. Under continuous shear, the flocculant most able to resist aggregate size reduction was anionic PAM, followed by PAM, anionic PNIPAM, PNIPAM (6MDa), and PNIPAM (122kDa). Reversible aggregate breakage was found with all samples, except with PNIPAM (6MDa) after being subjected to shear rates above 550s-1. Furthermore, heating of the PNIPAM-dosed suspensions at shear rates below 200s-1 produced larger and more breakage-resistant aggregates.
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Affiliation(s)
- Wei Sung Ng
- Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC 3010, Australia; CSIRO Mineral Resources, Clayton, VIC 3168, Australia.
| | - Luke A Connal
- Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC 3010, Australia.
| | | | | | - George V Franks
- Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC 3010, Australia.
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11
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Murdoch TJ, Humphreys BA, Willott JD, Gregory KP, Prescott SW, Nelson A, Wanless EJ, Webber GB. Specific Anion Effects on the Internal Structure of a Poly(N-isopropylacrylamide) Brush. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Timothy J. Murdoch
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Ben A. Humphreys
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Joshua D. Willott
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Kasimir P. Gregory
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Stuart W. Prescott
- School
of Chemical Engineering, UNSW Australia, UNSW Sydney, NSW 2052, Australia
| | - Andrew Nelson
- Australian Nuclear
Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
| | - Erica J. Wanless
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Grant B. Webber
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
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12
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Manikas AC, Aliberti A, Causa F, Battista E, Netti PA. Thermoresponsive PNIPAAm hydrogel scaffolds with encapsulated AuNPs show high analyte-trapping ability and tailored plasmonic properties for high sensing efficiency. J Mater Chem B 2015; 3:53-58. [DOI: 10.1039/c4tb01551g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The preparation of thermoresponsive PNIPAAm hydrogel scaffolds with encapsulated AuNPs showed high analyte-trapping ability and tailored plasmonic properties with high sensing efficiency.
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Affiliation(s)
- A. C. Manikas
- Center for Advanced Biomaterials for Healthcare@CRIB
- Istituto Italiano di Tecnologia (IIT)
- 80125 Naples
- Italy
| | - A. Aliberti
- Center for Advanced Biomaterials for Healthcare@CRIB
- Istituto Italiano di Tecnologia (IIT)
- 80125 Naples
- Italy
| | - F. Causa
- Center for Advanced Biomaterials for Healthcare@CRIB
- Istituto Italiano di Tecnologia (IIT)
- 80125 Naples
- Italy
- Interdisciplinary Research Centre on Biomaterials (CRIB)
| | - E. Battista
- Center for Advanced Biomaterials for Healthcare@CRIB
- Istituto Italiano di Tecnologia (IIT)
- 80125 Naples
- Italy
| | - P. A. Netti
- Center for Advanced Biomaterials for Healthcare@CRIB
- Istituto Italiano di Tecnologia (IIT)
- 80125 Naples
- Italy
- Interdisciplinary Research Centre on Biomaterials (CRIB)
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13
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Kang X, Yu Y, Bao Y, Cai W, Cui S. Real time quantification of the chemical cross-link density of a hydrogel by in situ UV-vis spectroscopy. Polym Chem 2015. [DOI: 10.1039/c5py00513b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A UV-vis spectroscopy-based method has been proposed to determine the cross-link density of the samples.
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Affiliation(s)
- Xiaomin Kang
- Key Lab of Advanced Technologies of Materials
- Ministry of Education of China
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - You Yu
- Key Lab of Advanced Technologies of Materials
- Ministry of Education of China
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Yu Bao
- Key Lab of Advanced Technologies of Materials
- Ministry of Education of China
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Wanhao Cai
- Key Lab of Advanced Technologies of Materials
- Ministry of Education of China
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Shuxun Cui
- Key Lab of Advanced Technologies of Materials
- Ministry of Education of China
- Southwest Jiaotong University
- Chengdu 610031
- China
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14
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Gong X, Hua L, Wei J, Ngai T. Tuning the particle-surface interactions in aqueous solutions by soft microgel particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13182-13190. [PMID: 25312378 DOI: 10.1021/la503573u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Due to the softness and deformability, interaction between colloidal surfaces induced by soft particles varies in a more complex way than for solid particles and thus has attracted much attention in recent years. In the present study, we use total internal reflection microscopy (TIRM) to directly measure the interaction between polystyrene (PS) microparticles and a flat glass surface in a poly(N-isopropylacrylamide) (PNIPAM) microgel dispersion with concentration varying from dilute (0.1 wt %) to highly concentrated regime (7.5 wt %). Our result shows that the PS particle-surface interactions mediated by the soft microgels are greatly affected by the particle concentration, the configuration of those microgels adsorbed on the surfaces, and the structure and packing of microgels in bulk solution. With increasing the microgel concentration (Cmicrogel), the interaction between the PS particle and surface turned from bridging attraction to steric repulsion, and then depletion attraction, which were mainly governed by the adsorption amount and configuration of microgels on the two surfaces. By further increasing Cmicrogel to condensed situation, structural force with oscillated energy wells was detected. The variation of interactions induced by the soft microgels was further confirmed by optical imaging. Crystallization of the PS microparticles appeared at moderate Cmicrogel; however, crystallization was hindered at higher Cmicrogel where the microgels are highly packed in the bulk solution. Furthermore, using TIRM, microgel packing with local energy well (0.1-1.0 kBT) at the highly condensed state (7.5 wt %) was resolved from the interaction profiles. Therefore, the shear force and modulus generated by such microgel packing can be determined as ∼0.2 pN and tens of mPa, respectively, which are much weaker than data given by conventional active methods.
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Affiliation(s)
- Xiangjun Gong
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou, China , 510640
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15
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Hamner KL, Maye MM. Thermal aggregation properties of nanoparticles modified with temperature sensitive copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:15217-15223. [PMID: 24266340 DOI: 10.1021/la4037887] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this paper, we describe the use of a temperature responsive polymer to reversibly assemble gold nanoparticles of various sizes. Temperature responsive, low critical solution temperature (LCST) pNIPAAm-co-pAAm polymers, with transition temperatures (T(C)) of 51 and 65 °C, were synthesized with a thiol modification, and grafted to the surface of 11 and 51 nm gold nanoparticles (AuNPs). The thermal-responsive behavior of the polymer allowed for the reversible aggregation of the nanoparticles, where at T < T(C) the polymers were hydrophilic and extended between particles. In contrast, at T > T(C), the polymer shell undergoes a hydrophilic to hydrophobic phase transition and collapses, decreasing interparticle distances between particles, allowing aggregation to occur. The AuNP morphology and polymer conjugation were probed by TEM, FTIR, and (1)H NMR. The thermal response was probed by UV-vis and DLS. The structure of the assembled aggregates at T > T(C) was studied via in situ small-angle X-ray scattering, which revealed interparticle distances defined by polymer conformation.
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Affiliation(s)
- Kristen L Hamner
- Department of Chemistry, Syracuse University , Syracuse, New York 13244, United States
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16
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Heppner IN, Islam MR, Serpe MJ. Unexpected Cononsolvency Behavior of Poly (N-isopropylacrylamide)-Based Microgels. Macromol Rapid Commun 2013; 34:1708-13. [DOI: 10.1002/marc.201300626] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Ian N. Heppner
- Department of Chemistry; University of Alberta; Edmonton AB T6G 2G2 Canada
| | - Molla R. Islam
- Department of Chemistry; University of Alberta; Edmonton AB T6G 2G2 Canada
| | - Michael J. Serpe
- Department of Chemistry; University of Alberta; Edmonton AB T6G 2G2 Canada
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17
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Hamner KL, Alexander CM, Coopersmith K, Reishofer D, Provenza C, Maye MM. Using temperature-sensitive smart polymers to regulate DNA-mediated nanoassembly and encoded nanocarrier drug release. ACS NANO 2013; 7:7011-20. [PMID: 23899347 DOI: 10.1021/nn402214e] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this paper we describe the use of a temperature-responsive polymer to regulate DNA interactions in both a DNA-mediated assembly system and a DNA-encoded drug delivery system. A thermoresponsive pNIPAAm-co-pAAm polymer, with a transition temperature (TC) of 51 °C, was synthesized with thiol modification and grafted onto gold nanoparticles (Au NPs) also containing single-stranded oligonucleotides (ssDNA). The thermoresponsive behavior of the polymer regulated the accessibility of the sequence-specific hybridization between complementary DNA-functionalized Au NPs. At T < TC, the polymer was hydrophilic and extended, blocking interaction between the complementary sequences at the periphery of the hydrodynamic diameter. In contrast, at T > TC, the polymer shell undergoes a hydrophilic to -phobic phase transition and collapses, shrinking below the outer ssDNA, allowing for the sequence-specific hybridization to occur. The potential application of this dynamic interface for drug delivery is shown, in which the chemotherapy drug doxorubicin (DOX) is bound to double-stranded DNA (dsDNA)-functionalized Au NPs whose sequences are known to be high-affinity intercalation points for it. The presence of the polymer capping is shown to decrease drug release kinetics and equilibrium at T < TC, but increase release at T > TC, thus improving the cytotoxicity of the encoded nanocarrier design.
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Affiliation(s)
- Kristen L Hamner
- Department of Chemistry, Syracuse University, Syracuse, New York 13244, United States
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Gong X, Ngai T. Interactions between solid surfaces with preadsorbed poly(ethylenimine) (PEI) layers: effect of unadsorbed free PEI chains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5974-5981. [PMID: 23627743 DOI: 10.1021/la400543c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Poly(ethylenimine) (PEI) polyelectrolytes have been widely used to tune the stability, rheology, or adhesion properties of colloidal suspensions due to their strong tendency to adsorb to solid surfaces. They have also gained importance as gene carriers in biomedical applications, in which the anionic DNA chains are complexed and condensed to form PEI/DNA polyplexes. Some reported literatures have recently shown that the overdosed PEI chains, which are free in the solution mixture, also play a vital role in promoting the gene transfection, but the reason is unclear. In this work, we present the results of using total internal reflection microscopy (TIRM) to measure the interaction forces between a Brownian colloidal sphere and a flat glass plate in the presence of overdosed free PEI cationic chains, when both surfaces were saturated adsorbed with the PEI chains. The colloidal sphere preadsorbed with PEI chains was chosen to mimic the PEI/DNA polyplex. Results for the potential energy of interaction measured for model polyplex (e.g., PEI-coated sphere) interacting with a PEI-coated glass surface in the presence of overdosed free PEI chains at various pH values and salt concentrations were presented. As can be shown by direct force measurements, the interaction potentials in NaCl salt solution are dominated by repulsive forces originating from diffuse layer overlap and gravitational attraction. However, the presence of free PEI chains in the solution mixture produces a long-ranged (>60 nm) attractive force between two PEI-coated surfaces with the range and magnitude tunable by pH value, PEI, and salt concentrations. The possible mechanisms of this long-ranged attractive force are discussed. A better understanding of this free PEI-induced attractive force will be useful in the development of improved PEI/DNA polyplexes systems for biomedical applications.
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Affiliation(s)
- Xiangjun Gong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
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Parasuraman D, Sarker AK, Serpe MJ. Recyclability of poly (N-isopropylacrylamide) microgel-based assemblies for organic dye removal from water. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-2915-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Parasuraman D, Sarker AK, Serpe MJ. Poly(N-Isopropylacrylamide)-Based Microgels and Their Assemblies for Organic-Molecule Removal from Water. Chemphyschem 2012; 13:2507-15. [DOI: 10.1002/cphc.201200025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 03/15/2012] [Indexed: 11/09/2022]
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Poly (N-isopropylacrylamide) microgel based assemblies for organic dye removal from water: microgel diameter effects. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2620-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Parasuraman D, Serpe MJ. Poly (N-isopropylacrylamide) microgel-based assemblies for organic dye removal from water. ACS APPLIED MATERIALS & INTERFACES 2011; 3:4714-21. [PMID: 22053867 DOI: 10.1021/am201132x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Poly(N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel assemblies (aggregates) were synthesized via polymerization of the cross-linker N,N'-methylenebisacrylamide (BIS) in the presence of microgels in solution. In this case, the microgels were entrapped in the polymerized cross-linker network. The aggregates were investigated for their ability to remove the organic, azo dye molecule 4-(2-hydroxy-1-napthylazo) benzenesulfonic acid sodium salt (Orange II) from water at both room and elevated temperatures. These results were compared with unaggregated microgels that were previously reported (Parasuraman, D.; Serpe, M. J. ACS. Appl. Mater. Interfaces 2011, 3, 2732.). It was found that the removal efficiency increased at elevated temperature, most likely due to the thermoresponsive nature of the pNIPAm-based aggregates, which expel water of solvation and deswell at higher temperature and reswell when they are cooled back to room temperature. Furthermore, increasing the number of cycles the aggregates are heated and cooled enhanced the percent removal of the dye from water. We also evaluated the effect of increasing cross-linker concentration on the removal efficiency, where we found the removal efficiency to increase with increasing cross-linker concentration in the aggregates. The maximum removal efficiency reached by the microgel aggregates at elevated temperatures was calculated to be 73.1%. This enhanced uptake is due to the presence of larger internal volume between the microgels in the aggregates, which the individual microgels lack. Control studies reveal that the structure and hydrophobicity of the aggregates lead to the enhanced uptake efficiencies and is not due to the presence of BIS alone. We determined that aggregates leak 75.6% of the dye that was originally removed from solution. The removal of Orange II by the aggregates at room temperature was fit by a Langmuir sorption isotherm.
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Affiliation(s)
- Deepika Parasuraman
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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Parasuraman D, Serpe MJ. Poly (N-isopropylacrylamide) microgels for organic dye removal from water. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2732-7. [PMID: 21682294 DOI: 10.1021/am2005288] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The ability of poly (N-isopropylacrylamide) (pNIPAm), and pNIPAm-co-acrylic acid (pNIPAm-co-AAc) microgels to remove an organic azo dye molecule, 4-(2-Hydroxy-1-naphthylazo) benzenesulfonic acid sodium salt (Orange II) from aqueous solutions at both room and elevated temperature was assessed. At room temperature, we found that the amount of Orange II removed from water (removal efficiency) increased with increasing AAc and microgel concentration. The removal of Orange II from water was also fit by a Langmuir sorption isotherm model. Furthermore, we found the extent of Orange II removal depended on solution temperature; more Orange II was removed from water at elevated temperature and as the microgels were held at that temperature for longer durations of time. Additionally, by increasing the cycles between high and ambient temperature, the removal of Orange II was enhanced, although this was only true for two temperature cycles. We hypothesize that this is a result of the thermoresponsive nature of pNIPAm-based microgels which deswell at elevated temperature expelling their solvating water and when the microgels are cooled back down they reswell with the Orange II containing water. We also hypothesize that the microgels become saturated after the second heating cycle and so the efficiency of removal did not increase further. Finally, we assessed the ability of the microgels to retain the Orange II after it is removed from the aqueous solution. We determined that the microgels "leak" 25.6% of the Orange II that was originally removed from the water.
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Chen TY, Chen JK. Ferritin immobilization on patterned poly(2-hydroxyethyl methacrylate) brushes on silicon surfaces from colloid system. Colloid Polym Sci 2011; 289:433-445. [PMID: 21461041 PMCID: PMC3040805 DOI: 10.1007/s00396-010-2370-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Revised: 12/21/2010] [Accepted: 12/28/2010] [Indexed: 11/29/2022]
Abstract
In this paper, we describe a graft polymerization/solvent immersion method for generating poly(2-hydroxyethyl methacrylate) (PHEMA) brushes in various patterns. We used a novel fabrication process, involving very-large-scale integration and oxygen plasma treatment, to generate well-defined patterns of polymerized PHEMA on patterned Si(100) surfaces. We observed brush- and mushroom-like regions for the PHEMA brushes, with various pattern resolutions, after immersing wafers presenting lines of these polymers in MeOH and n-hexane, respectively. The interaction between PHEMA and ferritin protein sheaths in MeOH and n-hexane (good and poor solvent for PHEMA, respectively) was used to capture and release ferritins from fluidic system. The “tentacles” behaver for PHEMA brushes was found through various solvents in fluidic system. Using high-resolution scanning electron microscopy, we observed patterned ferritin Fe cores on the Si surface after pyrolysis of the patterned PHEMA brushes and ferritin protein sheaths, which verify the “tentacles” behaver for PHEMA brushes.
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Affiliation(s)
- Tsung-Yen Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Rd, Taipei, 106 Taiwan Republic of China
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