151
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Yeh PD, Alexeev A. Mesoscale modelling of environmentally responsive hydrogels: emerging applications. Chem Commun (Camb) 2015; 51:10083-95. [DOI: 10.1039/c5cc01027f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We review recent advances in mesoscale computational modeling, focusing on dissipative particle dynamics, used to probe stimuli-sensitive behavior of hydrogels.
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Affiliation(s)
- Peter D. Yeh
- George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- USA
| | - Alexander Alexeev
- George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- USA
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152
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Massé P, Sellier E, Schmitt V, Ravaine V. Impact of electrostatics on the adsorption of microgels at the interface of Pickering emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:14745-14756. [PMID: 25409423 DOI: 10.1021/la503040f] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The importance of electrostatics on microgel adsorption at a liquid interface is studied, as well as its consequence on emulsion stabilization. In this work, poly(N-isopropylacrylamide) (pNIPAM) microgels bearing different numbers of charges and various distribution profiles are studied, both in solution and at the oil-water interface of emulsion drops. Charged microgels are compared to neutral ones, and electrostatic interactions are screened by adding salt to the aqueous solution. In solution, electrostatics has a significant impact on microgel swelling, as induced by the osmotic pressure exerted by mobile counterions in the gel network. At the interface of drops, microgels pack in a hexagonal array, whose lattice parameter is independent of the number of charges and range of electrostatic interactions. Microgel morphology and packing are ruled only by the adsorption of the pNIPAM chain at the interface. Conversely, decreasing the charge density of microgels by the protonation of the carboxylic groups leads to unstable emulsions, possibly as a result of the impact of hydrogen bonding on microgel deformability.
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Affiliation(s)
- Pascal Massé
- Université de Bordeaux, ISM, CNRS, ENSCBP , 16 Avenue Pey Berland, 33607 Pessac Cedex, France
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153
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Roberts D, Keeling R, Tracka M, van der Walle CF, Uddin S, Warwicker J, Curtis R. Specific Ion and Buffer Effects on Protein–Protein Interactions of a Monoclonal Antibody. Mol Pharm 2014; 12:179-93. [DOI: 10.1021/mp500533c] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- D. Roberts
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Sackville Street, Manchester M13 9PL, U.K
| | - R. Keeling
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Sackville Street, Manchester M13 9PL, U.K
| | - M. Tracka
- Formulation
Sciences, MedImmune, Ltd., Aaron Klug Building, Granta Park, Cambridge CB21 6GH, U.K
| | - C. F. van der Walle
- Formulation
Sciences, MedImmune, Ltd., Aaron Klug Building, Granta Park, Cambridge CB21 6GH, U.K
| | - S. Uddin
- Formulation
Sciences, MedImmune, Ltd., Aaron Klug Building, Granta Park, Cambridge CB21 6GH, U.K
| | - J. Warwicker
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Sackville Street, Manchester M13 9PL, U.K
| | - R. Curtis
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Sackville Street, Manchester M13 9PL, U.K
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154
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Synthesis and characterization of thermosensitive poly(N-isopropylacrylamide-co-hydroxyethylacrylamide) microgels as potential carriers for drug delivery. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0580-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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155
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Nebot VJ, Ojeda-Flores JJ, Smets J, Fernández-Prieto S, Escuder B, Miravet JF. Rational Design of Heat-Set and Specific-Ion-Responsive Supramolecular Hydrogels Based on the Hofmeister Effect. Chemistry 2014; 20:14465-72. [DOI: 10.1002/chem.201402547] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 07/01/2014] [Indexed: 01/03/2023]
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156
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Liu Z, Du H, Wickramasinghe SR, Qian X. Membrane surface engineering for protein separations: experiments and simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10651-10660. [PMID: 25127078 DOI: 10.1021/la5026119] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A bisphosphonate derived ligand was successfully synthesized and grafted from the surface of regenerated cellulose membrane using atom transfer radical polymerization (ATRP) for protein separations. This ligand has a remarkable affinity for arginine (Arg) residues on protein surface. Hydrophilic residues N-(2-hydroxypropyl) methacrylamide (HPMA) was copolymerized to enhance the flexibility of the copolymer ligand and further improve specific protein adsorption. The polymerization of bisphosphonate derivatives was successful for the first time using ATRP. Static and dynamic binding capacities were determined for binding and elution of Arg rich lysozyme. The interaction mechanism between the copolymer ligand and lysozyme was elucidated using classical molecular dynamics (MD) simulations.
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Affiliation(s)
- Zizhao Liu
- Department of Chemical Engineering and ‡Department of Biomedical Engineering, University of Arkansas , Fayetteville, Arkansas 72701, United States
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157
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Dubey NC, Tripathi BP, Stamm M, Ionov L. Smart core-shell microgel support for acetyl coenzyme A synthetase: a step toward efficient synthesis of polyketide-based drugs. Biomacromolecules 2014; 15:2776-83. [PMID: 24938082 DOI: 10.1021/bm5006382] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The flexibility in tuning the structure and charge properties of PNIPAm microgels during their synthesis makes them a suitable choice for various biological applications. Two-step free radical polymerization, a common method employed for synthesis of core-shell microgel has been well adopted to obtain cationic poly(N-isopropylacrylamide-aminoethyl methacrylate) (PNIPAm-AEMA) shell and PNIPAm core. Scanning electron microscopy (SEM), dynamic light scattering (DLS), zeta potential, and ninhydrin assay suggests nearly monodispersed particles of cationic nature. Amino groups on the microgel provides suitable attachment point for covalent immobilization of acetyl coenzyme A synthetase (Acs) via 1-ethyl-3-(3-N,N- dimethylaminopropyl) carbodiimide (EDC) chemistry. On immobilization, 61.55% of initial activity of Acs has been retained, while Michaelis-Menten kinetics of the immobilized Acs indicates identical K(m) (Michaelis constant) but decrease in the V(max) (maximum substrate conversion rate) compared to free enzyme. Immobilized Acs shows an improvement in activity at wide temperature and pH range and also demonstrates good thermal, storage, and operational stability. The Acs-microgel bioconjugate has been successfully reused for four consecutive operation cycles with more than 50% initial activity.
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Affiliation(s)
- Nidhi C Dubey
- Department of Nanostructured Materials, Leibniz Institute of Polymer Research Dresden , Hohe Str. 6, D-01069 Dresden, Germany
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158
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Conformational transitions and dynamics of thermal responsive poly(N-isopropylacrylamide) polymers as revealed by molecular simulation. Eur Polym J 2014. [DOI: 10.1016/j.eurpolymj.2014.03.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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159
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Xiao L, Isner A, Waldrop K, Saad A, Takigawa D, Bhattacharyya D. Development of Bench and Full-Scale Temperature and pH Responsive Functionalized PVDF Membranes with Tunable Properties. J Memb Sci 2014; 457:39-49. [PMID: 24944434 PMCID: PMC4058347 DOI: 10.1016/j.memsci.2014.01.033] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Temperature and pH responsive polymers (poly(N-isopropylacrylamide) (PNIPAAm), and polyacrylic acid, PAA) were synthesized in one common macrofiltration PVDF membrane platform by pore-filling method. The microstructure and morphology of the PNIPAAm-PVDF, and PNIPAAm-FPAA-PVDF membranes were studied by attenuated total reflectance Fourier transform infrared (ATR-FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The membrane pore size was controlled by the swelling and shrinking of the PNIPAAm at the temperature around lower critical solution temperature (LCST). The composite membrane demonstrated a rapid and reversible swelling and deswelling change within a small temperature range. The controllable flux makes it possible to utilize this temperature responsive membrane as a valve to regulate filtration properties by temperature change. Dextran solution (Mw=2,000,000g/mol, 26 nm diameter) was used to evaluate the separation performance of the temperature responsive membranes. The ranges of dextran rejection are from 4% to 95% depending on the temperature, monomer amount and pressure. The full-scale membrane was also developed to confirm the feasibility of our bench-scale experimental results. The full-scale membrane also exhibited both temperature and pH responsivity. This system was also used for controlled nanoparticles synthesis and for dechlorination reaction.
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Affiliation(s)
- Li Xiao
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
| | - Austin Isner
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
| | - Krysta Waldrop
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
| | - Anthony Saad
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
| | | | - Dibakar Bhattacharyya
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
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160
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Liu L, Shi Y, Liu C, Wang T, Liu G, Zhang G. Insight into the amplification by methylated urea of the anion specificity of macromolecules. SOFT MATTER 2014; 10:2856-2862. [PMID: 24667999 DOI: 10.1039/c3sm52778f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Methylated urea and sugar are chaotropic and kosmotropic osmolytes, respectively. In the present work, we have investigated the specific anion effect on the lower critical solution temperature (LCST) behavior of poly(N-isopropylacrylamide) (PNIPAM) in the presence of methylated urea or sugars. Differential scanning calorimetry studies revealed that tetramethylurea can adsorb onto the PNIPAM surface, but glucose is excluded from the PNIPAM surface. The specific anion effect on the LCST behavior of PNIPAM is amplified by methylated urea but not by sugars. The amplification of the anion specificity by methylated urea is attributed to an increased difference in the anion-specific polarization of hydrogen bonds, induced by the formation of PNIPAM/methylated urea complexes via hydrophobic interactions. As the number of methyl groups on the methylated urea increases, the extent of amplification of the anion specificity increases due to increasing hydrophobic interactions between the PNIPAM and methylated urea. Additionally, no amplification of the anion specificity is observed in the presence of urea because a PNIPAM/urea complex cannot be formed via hydrophobic interactions.
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Affiliation(s)
- Lvdan Liu
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, P.R. China.
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161
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Obiweluozor FO, GhavamiNejad A, Hashmi S, Vatankhah-Varnoosfaderani M, Stadler FJ. A NIPAM-Zwitterion Copolymer: Rheological Interpretation of the Specific Ion Effect on the LCST. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201300778] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Francis O. Obiweluozor
- Chonbuk National University, School of Semiconductor and Chemical Engineering; Baekjero 567, Deokjin-gu Jeonju Jeonbuk 561-756 Republic of Korea
| | - Amin GhavamiNejad
- College of Materials Science and Engineering; Shenzhen University; Shenzhen 518060 P. R. China
- Chonbuk National University, School of Semiconductor and Chemical Engineering; Baekjero 567, Deokjin-gu Jeonju Jeonbuk 561-756 Republic of Korea
| | - Saud Hashmi
- Department of Chemical Engineering; NED University of Engineering & Technology; University Road Karachi 75270 Pakistan
| | - Mohammad Vatankhah-Varnoosfaderani
- Islamic Azad University, Omidiyeh Branch, Department of Polymer; 63731-93719 Omidiyeh Iran
- Department of Chemistry; University of North Carolina, Chapel Hill; North Carolina 27599-3290 USA
| | - Florian J. Stadler
- College of Materials Science and Engineering; Shenzhen University; Shenzhen 518060 P. R. China
- Chonbuk National University, School of Semiconductor and Chemical Engineering; Baekjero 567, Deokjin-gu Jeonju Jeonbuk 561-756 Republic of Korea
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162
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Scherzinger C, Schwarz A, Bardow A, Leonhard K, Richtering W. Cononsolvency of poly-N-isopropyl acrylamide (PNIPAM): Microgels versus linear chains and macrogels. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.03.011] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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163
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Li W, Wu P. On the thermodynamic phase behavior of poly(N-vinylcaprolactam) solution in the presence of different ionic liquids. Polym Chem 2014. [DOI: 10.1039/c3py01104f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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164
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Vatankhah-Varnoosfaderani M, Hashmi S, GhavamiNejad A, Stadler FJ. Rapid self-healing and triple stimuli responsiveness of a supramolecular polymer gel based on boron–catechol interactions in a novel water-soluble mussel-inspired copolymer. Polym Chem 2014. [DOI: 10.1039/c3py00788j] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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165
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Lorbeer L, Alaghemandi M, Spohr E. Molecular dynamics studies of poly(N-isopropylacrylamide) endgrafted on the surfaces of model slab pores. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2013.05.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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166
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Dong Z, Mao J, Wang D, Yang M, Wang W, Bo S, Ji X. Tunable Dual-Thermoresponsive Phase Behavior of Zwitterionic Polysulfobetaine Copolymers Containing Poly(N,N
-dimethylaminoethyl methacrylate)-Grafted Silica Nanoparticles in Aqueous Solution. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300552] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Zhixin Dong
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
| | - Jun Mao
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
| | - Dapeng Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
| | - Muquan Yang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
| | - Weicai Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
| | - Shuqin Bo
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
| | - Xiangling Ji
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences; Changchun 130022 People's Republic of China
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167
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Jordão N, Gavara R, Parola AJ. Flavylium-Supported Poly(N-isopropylacrylamide): A Class of Multistimuli Responsive Polymer. Macromolecules 2013. [DOI: 10.1021/ma401497q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Noémi Jordão
- REQUIMTE, Departamento de
Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Raquel Gavara
- REQUIMTE, Departamento de
Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - A. Jorge Parola
- REQUIMTE, Departamento de
Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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168
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Himstedt HH, Qian X, Weaver JR, Wickramasinghe SR. Responsive membranes for hydrophobic interaction chromatography. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2013.07.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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169
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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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170
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Ju B, Cao S, Zhang S. Effect of Additives on the Cloud Point Temperature of 2-Hydroxy-3-isopropoxypropyl Starch Solutions. J Phys Chem B 2013; 117:11830-5. [DOI: 10.1021/jp404083r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Benzhi Ju
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China
| | - Shouqin Cao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China
| | - Shufen Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China
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171
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Lutter JC, Wu TY, Zhang Y. Hydration of Cations: A Key to Understanding of Specific Cation Effects on Aggregation Behaviors of PEO-PPO-PEO Triblock Copolymers. J Phys Chem B 2013; 117:10132-41. [DOI: 10.1021/jp405709x] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jacob C. Lutter
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Tsung-yu Wu
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Yanjie Zhang
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
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172
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Alaghemandi M, Spohr E. A new class of nanoengines based on thermoresponsive polymers: Conceptual design and behavior study. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.07.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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173
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Himstedt HH, Du H, Marshall KM, Wickramasinghe SR, Qian X. pH Responsive Nanofiltration Membranes for Sugar Separations. Ind Eng Chem Res 2013. [DOI: 10.1021/ie400982p] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Heath H. Himstedt
- Department
of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Hongbo Du
- Ralph E. Martin Department of
Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Kathryn M. Marshall
- Department
of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - S. Ranil Wickramasinghe
- Ralph E. Martin Department of
Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Xianghong Qian
- Ralph E. Martin Department of
Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
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174
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Du H, Wickramasinghe SR, Qian X. Specificity in Cationic Interaction with Poly(N-isopropylacrylamide). J Phys Chem B 2013; 117:5090-101. [DOI: 10.1021/jp401817h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Hongbo Du
- Department
of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | | | - Xianghong Qian
- Department
of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
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175
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Okur HI, Kherb J, Cremer PS. Cations Bind Only Weakly to Amides in Aqueous Solutions. J Am Chem Soc 2013; 135:5062-7. [DOI: 10.1021/ja3119256] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Halil I. Okur
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Jaibir Kherb
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Paul S. Cremer
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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176
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Liu L, Wang T, Liu C, Lin K, Ding Y, Liu G, Zhang G. Mechanistic Insights into Amplification of Specific Ion Effect in Water–Nonaqueous Solvent Mixtures. J Phys Chem B 2013; 117:2535-44. [DOI: 10.1021/jp311841m] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Lvdan Liu
- Department of Chemical Physics,
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei,
P. R. China 230026
| | - Tao Wang
- Department of Chemical Physics,
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei,
P. R. China 230026
| | - Chang Liu
- Department of Chemical Physics,
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei,
P. R. China 230026
| | - Ke Lin
- Department of Chemical Physics,
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei,
P. R. China 230026
| | - Yanwei Ding
- Department of Chemical Physics,
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei,
P. R. China 230026
| | - Guangming Liu
- Department of Chemical Physics,
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei,
P. R. China 230026
| | - Guangzhao Zhang
- Faculty
of Materials Science
and Engineering, South China University of Technology, Guangzhou, P. R. China 510640
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177
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Naini CA, Thomas M, Franzka S, Frost S, Ulbricht M, Hartmann N. Hofmeister Effect of Sodium Halides on the Switching Energetics of Thermoresponsive Polymer Brushes. Macromol Rapid Commun 2013; 34:417-22. [DOI: 10.1002/marc.201200681] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Revised: 11/27/2012] [Indexed: 12/15/2022]
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178
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Alaghemandi M, Spohr E. A molecular dynamics study of poly(N-isopropylacrylamide) endgrafted on a model cylindrical pore surface. RSC Adv 2013. [DOI: 10.1039/c3ra22266g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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179
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Interruption of hydration state of thermoresponsive polymer, poly(N-isopropylacrylamide) in guanidinium hydrochloride. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.12.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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180
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Kamath G, Deshmukh SA, Baker GA, Mancini DC, Sankaranarayanan SKRS. Thermodynamic considerations for solubility and conformational transitions of poly-N-isopropyl-acrylamide. Phys Chem Chem Phys 2013; 15:12667-73. [DOI: 10.1039/c3cp44076a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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181
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Atomistic insights into solvation dynamics and conformational transformation in thermo-sensitive and non-thermo-sensitive oligomers. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.11.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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182
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Reddy PM, Taha M, Venkatesu P, Kumar A, Lee MJ. Destruction of hydrogen bonds of poly(N-isopropylacrylamide) aqueous solution by trimethylamine N-oxide. J Chem Phys 2012; 136:234904. [PMID: 22779616 DOI: 10.1063/1.4729156] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Trimethylamine N-oxide (TMAO) is a compatible or protective osmolyte that stabilizes the protein native structure through non-bonding mechanism between TMAO and hydration surface of protein. However, we have shown here first time the direct binding mechanism for naturally occurring osmolyte TMAO with hydration structure of poly(N-isopropylacrylamide) (PNIPAM), an isomer of polyleucine, and subsequent aggregation of PNIPAM. The influence of TMAO on lower critical solution temperature (LCST) of PNIPAM was investigated as a function of TMAO concentration at different temperatures by fluorescence spectroscopy, viscosity (η), multi angle dynamic light scattering, zeta potential, and Fourier transform infrared (FTIR) spectroscopy measurements. To address some of the basis for further analysis of FTIR spectra of PNIPAM, we have also measured FTIR spectra for the monomer of N-isopropylacrylamide (NIPAM) in deuterium oxide (D(2)O) as a function of TMAO concentration. Our experimental results purportedly elucidate that the LCST values decrease with increasing TMAO concentration, which is mainly contributing to the direct hydrogen bonding of TMAO with the water molecules that are bound to the amide (-CONH) functional groups of the PNIPAM. We believed that the present work may act as a ladder to reach the heights of understanding of molecular mechanism between TMAO and macromolecule.
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183
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Xiao L, Isner AB, Hilt JZ, Bhattacharyya D. Temperature Responsive Hydrogel with Reactive Nanoparticles. J Appl Polym Sci 2012; 128:1804-1814. [PMID: 30518988 DOI: 10.1002/app.38335] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The application of temperature responsive hydrogels with ion-exchange domain for nanoscale catalytic reactions is an emerging and attractive area because of the combination of individual unique features: temperature responsive tunability by the polymer domain and the high catalytic reactivity of the nanomaterial. Here, we report the entrapment and/or direct synthesis of reactive Fe and Fe/Pd nanoparticles (about 40-70 nm) in a temperature responsive hydrogel network (N-isopropylacrylamide (NIPAAm), and NIPAAm-PAA). These nanoparticles are stabilized in the hydrogel network and the dechlorination (using trichloroethylene, TCE, as a model compound) reactivity in water is enhanced and controllable in the temperature range of 30-34°C involving polymer domain transitions at lower critical solution temperature (LCST) from hydrophilic to collapsed hydrophobic state. Water fraction modulation of the network and the enhancement of pollutant partitioning by the thermally responsive polymers play an important role in the catalytic activity.
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Affiliation(s)
- Li Xiao
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046
| | - Austin B Isner
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046
| | - J Zach Hilt
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046
| | - Dibakar Bhattacharyya
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046
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184
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Pattanayak SK, Chowdhuri S. A molecular dynamics simulations study on the behavior of liquid N-methylacetamide in presence of NaCl: Structure, dynamics and H-bond properties. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.05.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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185
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Deublein S, Vrabec J, Hasse H. A set of molecular models for alkali and halide ions in aqueous solution. J Chem Phys 2012; 136:084501. [DOI: 10.1063/1.3687238] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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186
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Deshmukh SA, Sankaranarayanan SKRS, Suthar K, Mancini DC. Role of solvation dynamics and local ordering of water in inducing conformational transitions in poly(N-isopropylacrylamide) oligomers through the LCST. J Phys Chem B 2012; 116:2651-63. [PMID: 22296566 DOI: 10.1021/jp210788u] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Conformational transitions in thermo-sensitive polymers are critical in determining their functional properties. The atomistic origin of polymer collapse at the lower critical solution temperature (LCST) remains a fundamental and challenging problem in polymer science. Here, molecular dynamics simulations are used to establish the role of solvation dynamics and local ordering of water in inducing conformational transitions in isotactic-rich poly(N-isopropylacrylamide) (PNIPAM) oligomers when the temperature is changed through the LCST. Simulated atomic trajectories are used to identify stable conformations of the water-molecule network in the vicinity of polymer segments, as a function of the polymer chain length. The dynamics of the conformational evolution of the polymer chain within its surrounding water molecules is evaluated using various structural and dynamical correlation functions. Around the polymer, water forms cage-like structures with hydrogen bonds. Such structures form at temperatures both below and above the LCST. The structures formed at temperatures above LCST, however, are significantly different from those formed below LCST. Short oligomers consisting of 3, 5, and 10 monomer units (3-, 5-, and 10-mer), are characterized by significantly higher hydration level (water per monomer ~ 16). Increasing the temperature from 278 to 310 K does not perturb the structure of water around the short oligomers. In the case of 3-, 5-, and 10-mer, a distinct coil-to-globule transition was not observed when the temperature was raised from 278 to 310 K. For a PNIPAM polymer chain consisting of 30 monomeric units (30-mer), however, there exist significantly different conformations corresponding to two distinct temperature regimes. Below LCST, the water molecules in the first hydration layer (~12) around hydrophilic groups arrange themselves in a specific ordered manner by forming a hydrogen-bonded network with the polymer, resulting in a solvated polymer acting as hydrophilic. Above LCST, this arrangement of water is no longer stable, and the hydrophobic interactions become dominant, which contributes to the collapse of the polymer. Thus, this study provides atomic-scale insights into the role of solvation dynamics in inducing coil-to-globule phase transitions through the LCST for thermo-sensitive polymers like PNIPAM.
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Affiliation(s)
- Sanket A Deshmukh
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
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187
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Wang T, Liu G, Zhang G, Craig VSJ. Insights into ion specificity in water-methanol mixtures via the reentrant behavior of polymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1893-1899. [PMID: 22185337 DOI: 10.1021/la203979d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In the present work, we have for the first time systematically investigated the ion specific reentrant behavior of poly(N-isopropylacryamide) (PNIPAM) in water-methanol mixtures. Turbidity measurements demonstrate that SCN(-) and ClO(4)(-) depress the reentrant transition, whereas other anions enhance the transition. As the anion changes from chaotropic to kosmotropic, the minimum critical phase transition temperature (T(min)) decreases and the corresponding volume fraction of methanol (X(M)) shifts to a larger value. Our results demonstrate that anion specificity is due to the anionic structure making/breaking effect on water/methanol complexes. Cations are found to have a lesser but still significant effect on the reentrant transition, and as T(min) decreases the corresponding X(M) also shifts to larger values as with the anions. Our studies show that cation specificity is induced by specific interactions between cations and PNIPAM chains. Furthermore, both anion and cation specificities are amplified as X(M) is increased due to the formation of additional water/methanol complexes. Calorimetry measurements demonstrate that the ion specificity is dominated by changes in entropy.
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Affiliation(s)
- Tao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, PR China 230026
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188
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Lo Nostro P, Ninham BW. Hofmeister phenomena: an update on ion specificity in biology. Chem Rev 2012; 112:2286-322. [PMID: 22251403 DOI: 10.1021/cr200271j] [Citation(s) in RCA: 671] [Impact Index Per Article: 55.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Pierandrea Lo Nostro
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy.
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189
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Algaer EA, van der Vegt NFA. Hofmeister ion interactions with model amide compounds. J Phys Chem B 2011; 115:13781-7. [PMID: 22014181 DOI: 10.1021/jp208583w] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dissolved electrolytes interact with peptides and proteins in aqueous solution. Herein, we study small amide compounds in aqueous electrolyte solutions and link their salting-in and salting-out propensities to molecular-level structural details obtained with molecular simulations. Aqueous solutions of NaF, NaCl, NaBr, NaI, NaNO(3), and NaClO(4) with N-isopropylacrylamide (NiPAM) and N-methylacetamide (NMA) have been investigated. Our results show that NiPAM is salted-in by NaI, mediated through iodide interactions with nonpolar groups, while being salted-out by the other salts. Hydrogen-bonding interactions of anions with the amide group of NiPAM could not be identified, while in the systems with NMA all Hofmeister anions formed stable hydrogen bonds with the amide group. These results indicate that the immediate chemical environment of the backbone amide groups should be considered in studies of protein destabilization by dissolved electrolytes. We furthermore report that all salts but NaI provoke a hydrophobic collapse transition of poly(N-isopropylacrylamide) in water at 300 K, in qualitative agreement with experimentally measured salt effects on the lower critical solution temperature of this system.
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Affiliation(s)
- Elena A Algaer
- Center of Smart Interfaces, Technische Universität Darmstadt, Petersenstrasse 32, 64287 Darmstadt, Germany
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190
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Alaghemandi M, Spohr E. Molecular Dynamics Investigation of the Thermo-Responsive Polymer Poly(N
-isopropylacrylamide). MACROMOL THEOR SIMUL 2011. [DOI: 10.1002/mats.201100071] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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191
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Taha M, Gupta BS, Khoiroh I, Lee MJ. Interactions of Biological Buffers with Macromolecules: The Ubiquitous “Smart” Polymer PNIPAM and the Biological Buffers MES, MOPS, and MOPSO. Macromolecules 2011. [DOI: 10.1021/ma201790c] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mohamed Taha
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Bhupender S. Gupta
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Ianatul Khoiroh
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Ming-Jer Lee
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
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192
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Sasaki S, Okabe S. Effects of Ions on the Solubility Transition and the Phase-Separation of N-Isopropylacrylamide in Water. J Phys Chem B 2011; 115:12905-10. [DOI: 10.1021/jp207576z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shigeo Sasaki
- Department of Chemistry, Faculty of Sciences, Kyushu University, 33 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Satoshi Okabe
- Department of Chemistry, Faculty of Sciences, Kyushu University, 33 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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193
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Sun S, Wu P. Infrared spectroscopic insight into hydration behavior of poly(N-vinylcaprolactam) in water. J Phys Chem B 2011; 115:11609-18. [PMID: 21899307 DOI: 10.1021/jp2071056] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
IR spectroscopy in combination with two-dimensional correlation spectroscopy (2DCOS) and the perturbation correlation moving window (PCMW) technique is employed to illustrate the dynamic hydration behavior of poly(N-vinylcaprolactam) (PVCL) in water, which exhibits a typical type I continuous lower critical solution temperature (LCST) behavior. PCMW easily determined the transition temperature to be ca. 43.5 °C during heating and ca. 42.5 °C during cooling and the transition temperature range to be 39.5-45 °C. On the other hand, 2DCOS was used to discern the sequence order of different species in PVCL and concluded that hydrogen bonding transformation predominates at the first stage below LCST while hydrophobic interaction predominates at the second stage above LCST. In combination with molecular dynamics simulation results, we find that there exists a distribution gradient of water molecules in PVCL mesoglobules ranging from a hydrophobic core to a hydrophilic surface. Due to the absence of self-associated hydrogen bonds and topological constraints, PVCL mesoglobules would form a "sponge-like" structure which can further continuously expel water molecules upon increasing temperature, while poly(N-isopropylacrylamide) (PNIPAM) with self-associated hydrogen bonds forms mesoglobules with a "cotton-ball-like" structure without an apparent distribution gradient of water molecules and does not change much upon increasing temperature.
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Affiliation(s)
- Shengtong Sun
- The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, People's Republic of China
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194
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Du H, Qian X. Molecular dynamics simulations of PNIPAM-co
-PEGMA copolymer hydrophilic to hydrophobic transition in NaCl solution. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/polb.22280] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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