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Li Q, Wen C, Yang J, Zhou X, Zhu Y, Zheng J, Cheng G, Bai J, Xu T, Ji J, Jiang S, Zhang L, Zhang P. Zwitterionic Biomaterials. Chem Rev 2022; 122:17073-17154. [PMID: 36201481 DOI: 10.1021/acs.chemrev.2c00344] [Citation(s) in RCA: 114] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The term "zwitterionic polymers" refers to polymers that bear a pair of oppositely charged groups in their repeating units. When these oppositely charged groups are equally distributed at the molecular level, the molecules exhibit an overall neutral charge with a strong hydration effect via ionic solvation. The strong hydration effect constitutes the foundation of a series of exceptional properties of zwitterionic materials, including resistance to protein adsorption, lubrication at interfaces, promotion of protein stabilities, antifreezing in solutions, etc. As a result, zwitterionic materials have drawn great attention in biomedical and engineering applications in recent years. In this review, we give a comprehensive and panoramic overview of zwitterionic materials, covering the fundamentals of hydration and nonfouling behaviors, different types of zwitterionic surfaces and polymers, and their biomedical applications.
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Affiliation(s)
- Qingsi Li
- Department of Biochemical Engineering, Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
| | - Chiyu Wen
- Department of Biochemical Engineering, Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
| | - Jing Yang
- Department of Biochemical Engineering, Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
| | - Xianchi Zhou
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yingnan Zhu
- Institute of Drug Discovery and Development, School of Pharmaceutical Sciences, Center for Drug Safety Evaluation and Research, Zhengzhou University, Zhengzhou 450001, China
| | - Jie Zheng
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Gang Cheng
- Department of Chemical Engineering, The University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Jie Bai
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China
| | - Tong Xu
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China
| | - Jian Ji
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Shaoyi Jiang
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Lei Zhang
- Department of Biochemical Engineering, Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
| | - Peng Zhang
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China
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Yao Y, Zhu YL, Ma X, Zhou J. Interactions on Proteins Arising from the Self-Assembly of a Polyelectrolyte Brush. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7759-7765. [PMID: 35709429 DOI: 10.1021/acs.langmuir.2c00801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Surfaces grafted with polyelectrolyte chains for excellent performance in protein antifouling are highly desired in many applications, such as biomedical implants and devices. In general, the adsorbing/resisting behaviors of proteins can be mainly attributed to the electrostatic interactions that are associated with the charge properties of proteins and polyelectrolytes. By coarse-grained molecular dynamics simulations, we examined the self-assembled structures of polyanion and polyzwitterion brushes as well as the interactions on negatively and positively charged proteins. We found that in addition to charges, the structural polarization induced by self-assembly with a certain charge distribution shows significant influences on protein behavior. The large-scale dipole-dipole interactions between brushes and proteins can dominate the behavior of proteins on the brushes under certain circumstances. To ensure simulation accuracy, we compared two models and found a polar Martini model that explicitly treats electrostatic interactions as long-ranged ones, giving a more reasonable structural description compared with the normal Martini model that truncates electrostatic interactions.
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Affiliation(s)
- Yunming Yao
- Department of Dermatology and Venereology, The First Hospital of Jilin University, Changchun, Jilin 130021, China
| | - You-Liang Zhu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China
| | - Xiaoyuan Ma
- Jilin Provincial Center for Animal Disease Control and Prevention, Changchun 130062, China
| | - Junfeng Zhou
- Department of Dermatology and Venereology, The First Hospital of Jilin University, Changchun, Jilin 130021, China
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3
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Hammond OS, Moura L, Level G, Imberti S, Holbrey JD, Blesic M. Hydration of sulfobetaine dizwitterions as a function of alkyl spacer length. Phys Chem Chem Phys 2020; 22:16040-16050. [PMID: 32706356 DOI: 10.1039/d0cp02654a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solvation and structure of bolaform dizwitterions containing two sulfobetaine moieties in concentrated aqueous solution were determined using neutron diffraction with isotopic substitution (NDIS) combined with modelling of the measured structure factors using Empirical Potential Structure Refinement (EPSR). Strongly directional local hydration was observed in the polar regimes of the dizwitterions with 48-52 water molecules shared between dizwitterion molecules in a first shell water network around each zwitterion pair. Overall, the double zwitterions were highly hydrated, providing experimental evidence in support of the potential formation of protein-resistant hydration layers at zwitterion-water interfaces.
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Affiliation(s)
- Oliver S Hammond
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, Northern Ireland, UK.
| | - Leila Moura
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, Northern Ireland, UK.
| | - Gaelle Level
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, Northern Ireland, UK.
| | - Silvia Imberti
- ISIS, Rutherford Appleton Laboratory, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
| | - John D Holbrey
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, Northern Ireland, UK.
| | - Marijana Blesic
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, Northern Ireland, UK.
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Xiang Y, Xu RG, Leng Y. Molecular Understanding of Ion Effect on Polyzwitterion Conformation in an Aqueous Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7648-7657. [PMID: 32506917 DOI: 10.1021/acs.langmuir.0c01287] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polyzwitterions (PZs) are promising materials for the antifouling in reverse osmosis and nanofiltration membrane technology for water treatment. Fundamental understanding of the structure and molecular interactions involving zwitterions is crucial to the optimal design of antifouling in membrane separation. Here we employ the umbrella sampling and molecular dynamics simulations to investigate molecular interactions between sulfobetaine/carboxybetaine zwitterions and different metal ions (Na+, K+, and Ca2+) in an aqueous solution. The simulation results show that these ions can form stable or metastable contact ionic/solvent-shared-ionic pairs with zwitterions. Simulations at different grafting densities of PZ brush arrays reveal complex competitive association mechanisms, which are attributed to nonbonded electrostatic and van der Waals interactions among zwitterions, water molecules, and different metal ions in an aqueous environment. While the high-grafting density of the PZ brush array leads to a strong branch association between different zwitterions in water, this association is decreased at intermediate- and low-grafting densities due to strong zwitterion-water interactions. More importantly, adding ions into water at intermediate- and low-grafting densities further breaks down the zwitterion branch association, resulting in a randomly oriented and dispersed branch configuration with significant swelling of the polymers. The degree of swelling depends on the type of ions, which further changes the surface electrostatic potential of PZ coatings.
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Affiliation(s)
- Yuan Xiang
- Department of Mechanical & Aerospace Engineering, The George Washington University, Washington, District of Columbia 20052, United States
| | - Rong-Guang Xu
- Department of Mechanical & Aerospace Engineering, The George Washington University, Washington, District of Columbia 20052, United States
| | - Yongsheng Leng
- Department of Mechanical & Aerospace Engineering, The George Washington University, Washington, District of Columbia 20052, United States
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5
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Choi W, Jin J, Park S, Kim JY, Lee MJ, Sun H, Kwon JS, Lee H, Choi SH, Hong J. Quantitative Interpretation of Hydration Dynamics Enabled the Fabrication of a Zwitterionic Antifouling Surface. ACS APPLIED MATERIALS & INTERFACES 2020; 12:7951-7965. [PMID: 31968161 DOI: 10.1021/acsami.9b21566] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In the medical industry, zwitterionic brushes have received significant attention owing to their antifouling effect that arose from their hydration ability. However, sufficient understanding of the hydration dynamics of zwitterionic brushes is required to fabricate the precisely controlled antifouling medical devices. In this paper, we successfully show that hydration, the interaction between water molecules and zwitterionic brushes, and its dynamics can be evaluated logically and quantitatively using (i) water contact angle, (ii) molecular dynamics simulation, and (iii) Raman spectroscopy. Based on the intuitive results on hydration, we precisely optimized the antifouling property of the model medical device, a removable orthodontic retainer, with various grafting efficiencies of 2-methacryloyloxyethyl phosphate choline. As a result, the model device reduced nonspecific adsorption of proteins and bacteria, indicating an improved antifouling effect, and also inhibited the formation of a biofilm. Furthermore, the device showed excellent physical properties desirable for application in the orthodontic field, meaning the balance between the antibacterial property and mechanical strength.
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Affiliation(s)
- Woojin Choi
- Department of Chemical & Biomolecular Engineering, College of Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 03722 , Republic of Korea
| | - Jie Jin
- Department of Orthodontics, Institute of Craniofacial Deformity , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
| | - Sohyeon Park
- Department of Chemical & Biomolecular Engineering, College of Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 03722 , Republic of Korea
| | - Ji-Yeong Kim
- Department of Orthodontics, Institute of Craniofacial Deformity , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
- BK21 PLUS Project , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
| | - Myung-Jin Lee
- Department of Orthodontics, Institute of Craniofacial Deformity , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
- Department and Research Institute of Dental Biomaterials and Bioengineering , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
| | - Hyeongdeok Sun
- Department of Chemical & Biomolecular Engineering, College of Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 03722 , Republic of Korea
| | - Jae-Sung Kwon
- Department and Research Institute of Dental Biomaterials and Bioengineering , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
- BK21 PLUS Project , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
| | - Hwankyu Lee
- Department of Chemical Engineering , Dankook University , 152 Jukjeon-ro , Suji-gu, Yongin-si , Gyeonggi-do 16890 , Republic of Korea
| | - Sung-Hwan Choi
- Department of Orthodontics, Institute of Craniofacial Deformity , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
- BK21 PLUS Project , Yonsei University College of Dentistry , Seoul 03722 , Republic of Korea
| | - Jinkee Hong
- Department of Chemical & Biomolecular Engineering, College of Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 03722 , Republic of Korea
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6
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Knowles BR, Wagner P, Maclaughlin S, Higgins MJ, Molino PJ. Carboxybetaine functionalized nanosilicas as protein resistant surface coatings. Biointerphases 2020; 15:011001. [PMID: 31906624 DOI: 10.1063/1.5126467] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Materials with protein resistant properties are increasingly sought after for their potential application as low-fouling surface coatings. Hydrophilic coatings with improved resistance to protein fouling have been prepared from zwitterionic carboxybetaine (CB) functionalized silica nanoparticles (SiNPs). The authors report three methods of coating preparation via direct tethering of CB to predeposited particle films, a two-step surface functionalization process, and deposition of CB functionalized particle dispersions. The pH at which aqueous CB solutions were prepared and reacted to SiNPs was found to drastically influence the mechanism of CB attachment and affect the protein resistance of the resultant coatings. Depending on the method of coating preparation, protein binding to functionalized particle coatings was reduced by up to 94% compared to unfunctionalized SiNP control surfaces. As a result, all three methods offer simple and scalable fabrication routes for the generation of hydrophilic, zwitterionic interfaces with improved inhibition to protein fouling.
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Affiliation(s)
- Brianna R Knowles
- ARC Research Hub for Australian Steel Manufacturing, Wollongong, NSW 2522, Australia
| | - Pawel Wagner
- Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus, University of Wollongong, Wollongong, NSW 2500, Australia
| | - Shane Maclaughlin
- ARC Research Hub for Australian Steel Manufacturing, Wollongong, NSW 2522, Australia
| | - Michael J Higgins
- ARC Research Hub for Australian Steel Manufacturing, Wollongong, NSW 2522, Australia
| | - Paul J Molino
- ARC Research Hub for Australian Steel Manufacturing, Wollongong, NSW 2522, Australia
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7
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Kardela JH, Millichamp IS, Ferguson J, Parry AL, Reynolds KJ, Aldred N, Clare AS. Nonfreezable Water and Polymer Swelling Control the Marine Antifouling Performance of Polymers with Limited Hydrophilic Content. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29477-29489. [PMID: 31397993 DOI: 10.1021/acsami.9b05893] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Zwitterionic chemical groups have well-documented resistance to marine fouling species when presented as homogeneous polymer brushes. These model formulations are not, however, suitable for practical fouling-control applications. It is presently unknown if a uniform film of zwitterions is required to elicit nonfouling character via the binding of interfacial water or if the incorporation of zwitterionic functionality into a more practical bulk polymer system will suffice. Here, copolymers of n-butyl methacrylate were synthesized with low incorporation levels (up to 20 mol %) of hydrophilic functionality, including zwitterionic moieties. Their antifouling (AF) properties were evaluated using barnacle cyprids (Balanus improvisus), diatom cells (Navicula incerta), and a multispecies biofilm. The laboratory assays revealed higher resistance of ionic copolymers toward cyprid settlement, which was attributed to their swelling and the presence of nonfreezable water molecules bound tightly to the polymer chains. Additionally, cells of N. incerta and the multispecies biofilm were removed more effectively on polymers containing sulfobetaine methacrylate and sulfopropyl methacrylate moieties. The results indicate that the presence of tightly bound interfacial water is not limited to model systems of pure hydrophilic homopolymers, but that this mechanism can also reduce the settlement and adhesion of fouling species via bulk copolymer systems with limited hydrophilic content. The swelling of polymers with hydrophilic content may also contribute to their AF efficacy, and such materials may therefore represent a route to translation of the well-documented nonfouling character of zwitterions into practical, industrially relevant coating formulations.
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Affiliation(s)
- Jan H Kardela
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , U.K
| | - Ian S Millichamp
- AkzoNobel , Marine and Protective Coatings, Stoneygate Lane , Gateshead NE10 0JY , U.K
| | - James Ferguson
- AkzoNobel , Marine and Protective Coatings, Stoneygate Lane , Gateshead NE10 0JY , U.K
| | - Alison L Parry
- AkzoNobel , Marine and Protective Coatings, Stoneygate Lane , Gateshead NE10 0JY , U.K
| | - Kevin J Reynolds
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , U.K
| | - Nick Aldred
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , U.K
| | - Anthony S Clare
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , U.K
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8
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Sun X, Qian X. Atomistic Molecular Dynamics Simulations of the Lower Critical Solution Temperature Transition of Poly( N-vinylcaprolactam) in Aqueous Solutions. J Phys Chem B 2019; 123:4986-4995. [PMID: 31124684 DOI: 10.1021/acs.jpcb.9b01711] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly( N-vinylcaprolactam) (PVCL) is a thermo-responsive polymer, which exhibits a lower critical solution temperature (LCST) in an aqueous solution. The LCST of this hydrophilic-to-hydrophobic transition is found to be strongly dependent on the salt-type and salt-concentration as well as on the molecular weight and concentration of the polymer. Here, atomistic molecular dynamics simulations have been successfully conducted for the first time to investigate the LCST transition of a 100 degree of polymerization PVCL chain in water, 1 M NaCl, 3.5 M NaCl, and 0.5 M CaCl2 solutions. Our results show that steric hindrance resulting from the bulky 7-member ring on the PVCL chain plays a critical role in the conformational transition. Moreover, the degrees of hydration and dehydration below or above the transition temperature are highly dependent on the specific solution condition and temperature. Water molecules are found to be trapped inside the collapsed polymer chains leading to the varying degrees of hydration and dehydration of the polymer chain in different solutions. Calculated water diffusion coefficients for both trapped and free water molecules agree very well with experimental measurements.
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Affiliation(s)
- Xiaoquan Sun
- Department of Biomedical Engineering , University of Arkansas , Fayetteville , Arkansas 72701 , United States
| | - Xianghong Qian
- Department of Biomedical Engineering , University of Arkansas , Fayetteville , Arkansas 72701 , United States
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9
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Zhu YL, Lu ZY, Li ZW, Sun ZY, Liu X. Effect of the Self-Assembled Structures of Hydrated Polyzwitterionic and Polyanionic Brushes on Their Self-Cleaning Capabilities. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6669-6675. [PMID: 31034239 DOI: 10.1021/acs.langmuir.9b00714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The capability of polyelectrolyte brushes to spontaneously clean oil fouling via water is determined by factors including water wettability and the self-assembled structures of hydrated polyelectrolytes. Although the charged groups of polyelectrolytes provide the original source of water wettability, the self-assembled structures play a significant role in the self-cleaning performances. Here, we employ coarse-grained molecular dynamics simulations to study the general self-cleaning characteristics of two types of surface-grafted polyelectrolyte brushes (i.e., zwitterionic and anionic polyelectrolytes). It has been found that the high grafting density is favorable to fouling reduction for both polyzwitterions and polyanions. To be specific, the hydrated polyzwitterions form an intermolecular cross-linked network via zwitterionic complexes, resulting in better self-cleaning capabilities than the polyanions at lower grafting densities. However, polyanions form bundles with each consisting of several chains via hydrophobic interactions and electrostatic repulsions presenting better self-cleaning performances than the polyzwitterions at higher grafting densities.
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Affiliation(s)
- You-Liang Zhu
- State Key Laboratory of Polymer Physics and Chemistry , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
| | | | - Zhan-Wei Li
- State Key Laboratory of Polymer Physics and Chemistry , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
| | - Zhao-Yan Sun
- State Key Laboratory of Polymer Physics and Chemistry , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
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10
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Shao Q. A computational avenue towards understanding and design of zwitterionic anti-biofouling materials. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2019.1599118] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Qing Shao
- Chemical and Materials Engineering, University of Kentucky, Lexington KY, USA
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11
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Cheung DL, Lau KHA. Atomistic Study of Zwitterionic Peptoid Antifouling Brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1483-1494. [PMID: 30142978 DOI: 10.1021/acs.langmuir.8b01939] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Using molecular dynamics (MD) simulations, we study the molecular behavior and hydration properties of a set of zwitterionic "peptoid" brushes, grafted on a rutile surface, that has been previously reported to exhibit excellent resistance against protein adsorption and cell attachment. Peptoids are novel poly( N-substituted glycine) peptide mimics with the side chains attached to amide nitrogens. They constitute a unique model polymer system because hundreds of side chains have been demonstrated, and the exact chain length and sequence order of the residues/monomers may be specified in experiments. In this report, we vary the brush grafting density as well as the side chain/polymer molecular volume. We include in our study polysarcosine as an uncharged comparison with a small polymer chain cross-section. Sarcosine is the simplest peptoid residue with only a nominally hydrophobic methyl group as side chain, but is also reported to exhibit high antifouling performance. Overall, we show in detail how molecular volume and hydration effects are intertwined in a zwitterionic polymer brush. For example, the zwitterionic design significantly promotes extended chain conformations and could actually lower the overall electrostatic potential. Some properties promoted by the balanced charges, such as chain flexibility and hydration, increase more prominently at "low" to "intermediate" chain densities. These and other observations should provide insight on the molecular behavior of peptoids and inform the design of zwitterionic antifouling polymer brushes.
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Affiliation(s)
- David L Cheung
- School of Chemistry , National University of Ireland Galway , Galway H91 TK33 , Ireland
| | - King Hang Aaron Lau
- Department of Pure and Applied Chemistry , University of Strathclyde , Glasgow G1 1XL , United Kingdom
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12
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Upadhyaya L, Qian X, Ranil Wickramasinghe S. Chemical modification of membrane surface — overview. Curr Opin Chem Eng 2018. [DOI: 10.1016/j.coche.2018.01.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Xiang Y, Xu RG, Leng Y. Molecular Simulations of the Hydration Behavior of a Zwitterion Brush Array and Its Antifouling Property in an Aqueous Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2245-2257. [PMID: 29361214 DOI: 10.1021/acs.langmuir.7b03386] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We carried out umbrella sampling and molecular dynamics (MD) simulations to investigate molecular interactions between sulfobetaine zwitterions or between sulfobetaine brushes in different media. Simulation results show that it is more energetically favorable for the two sulfobetaine zwitterions or brushes to be fully hydrated in aqueous solutions than in vacuum where strong ion pairs are formed. Structural properties of the hydrated sulfobetaine brush array and its antifouling behavior against a foulant gel are subsequently studied through steered MD simulations. We find that sulfobetaine brush arrays with different grafting densities have different structures and antifouling mechanisms. At a comparably higher grafting density, the sulfobetaine brush array exhibits a more organized structure which can hold a tightly bound hydration water layer at the interface. Compression of this hydration layer results in a strong repulsive force. However, at a comparably lower grafting density, the brush array exhibits a randomly oriented structure in which the antifouling of the brush array is through the deformation of the sulfobetaine branches.
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Affiliation(s)
- Yuan Xiang
- Department of Mechanical & Aerospace Engineering, The George Washington University , Washington, D.C. 20052, United States
| | - Rong-Guang Xu
- Department of Mechanical & Aerospace Engineering, The George Washington University , Washington, D.C. 20052, United States
| | - Yongsheng Leng
- Department of Mechanical & Aerospace Engineering, The George Washington University , Washington, D.C. 20052, United States
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14
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Biswas Y, Mandal TK. Structural Variation in Homopolymers Bearing Zwitterionic and Ionic Liquid Pendants for Achieving Tunable Multi-Stimuli Responsiveness and Hierarchical Nanoaggregates. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b02106] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yajnaseni Biswas
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Tarun K. Mandal
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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15
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Zhang C, Liu Y, Liu Z, Zhang H, Cheng Q, Yang C. Regulation Mechanism of Salt Ions for Superlubricity of Hydrophilic Polymer Cross-Linked Networks on Ti 6Al 4V. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2133-2140. [PMID: 28183180 DOI: 10.1021/acs.langmuir.6b04429] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Poly(vinylphosphonic acid) (PVPA) cross-linked networks on Ti6Al4V show superlubricity behavior when sliding against polytetrafluoroethylene in water-based lubricants. The superlubricity can occur but only with the existence of salt ions in the polymer cross-linked networks. This is different from the phenomenon in most polymer brushes. An investigation into the mechanism revealed that cations and anions in the lubricants worked together to yield the superlubricity even under harsh conditions. It is proposed that the preferential interactions of cations with PVPA molecules rather than water molecules are the main reason for the superlubricity in water-based lubricants. The interaction of anions with water molecules regulates the properties of the tribological interfaces, which influences the magnitude of the friction coefficient. Owing to the novel cross-linked networks and the interactions between cations and polymer molecules, their superlubricity can be maintained even at a high salt ion concentration of 5 M. These excellent properties make PVPA-modified Ti6Al4V a potential candidate for application in artificial implants.
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Affiliation(s)
- Caixia Zhang
- Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology , Beijing 100124, China
| | - Yuhong Liu
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, PR China
| | - Zhifeng Liu
- Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology , Beijing 100124, China
| | - Hongyu Zhang
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, PR China
| | - Qiang Cheng
- Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology , Beijing 100124, China
| | - Congbin Yang
- Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology , Beijing 100124, China
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Cheng G, Liao M, Zhao D, Zhou J. Molecular Understanding on the Underwater Oleophobicity of Self-Assembled Monolayers: Zwitterionic versus Nonionic. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1732-1741. [PMID: 28122450 DOI: 10.1021/acs.langmuir.6b03988] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Molecular dynamics simulations are conducted to investigate the underwater oleophobicity of self-assembled monolayers (SAMs) with different head groups. Simulation results show that the order of underwater oleophobicity of SAMs is methyl < amide < oligo(ethylene glycol) (OEG) < ethanolamine (ETA) < hydroxyl < mixed-charged zwitterionic. The underwater-oil contact angles (OCAs) are <133° for all nonionic hydrophilic SAMs, while the mixed-charged zwitterionic SAMs are underwater superoleophobic (OCA can reach 180°). It appears that surfaces with stronger underwater oleophobicity have better antifouling performance. Further study on the effect of different alkyl ammonium ions on mixed-charged SAMs reveals that the underwater OCAs are >143.6° for all SAMs; mixed-charged SAMs containing primary alkyl ammonium ion are likely to possess the best underwater oleophobicity for its strong hydration capacity. It seems that alkyl sulfonate anion (SO3-) is more hydrophilic than alkyl trimethylammonium ion (NC3+) for the hydrophobic methyl groups on nitrogen atoms and that the hydration of SO3- in mixed-charged SAMs can be seriously blocked by NC3+. The monomer of SO3- should be slightly longer than that of NC3+ to obtain better underwater oleophobicity in NC3+-/SO3--SAMs. In addition, the underwater oleophobicity of SAMs might become worse at low grafting densities. This work systematically proves that a zwitterionic surface is more underwater oleophobic than a nonionic surface. These results will help for the design and development of superoleophobic surfaces.
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Affiliation(s)
- Gang Cheng
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory for Green Chemical Product Technology, South China University of Technology , Guangzhou 510640, China
| | - Mingrui Liao
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory for Green Chemical Product Technology, South China University of Technology , Guangzhou 510640, China
| | - Daohui Zhao
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory for Green Chemical Product Technology, South China University of Technology , Guangzhou 510640, China
| | - Jian Zhou
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory for Green Chemical Product Technology, South China University of Technology , Guangzhou 510640, China
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17
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Song G, Wickramasinghe SR, Qian X. The Effects of Salt Type and Salt Concentration on the Performance of Magnetically Activated Nanofiltration Membranes. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04278] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guanghui Song
- Ralph
E Martin Department of Chemical Engineering, and ‡Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - S. Ranil Wickramasinghe
- Ralph
E Martin Department of Chemical Engineering, and ‡Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Xianghong Qian
- Ralph
E Martin Department of Chemical Engineering, and ‡Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
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18
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Hildebrand V, Laschewsky A, Päch M, Müller-Buschbaum P, Papadakis CM. Effect of the zwitterion structure on the thermo-responsive behaviour of poly(sulfobetaine methacrylates). Polym Chem 2017. [DOI: 10.1039/c6py01220e] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Modulating the thermo-responsive behaviour of poly(sulfobetaine methacrylates) whereby small structural changes cause big effects but show little logic.
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Affiliation(s)
- Viet Hildebrand
- Institut für Chemie
- Universität Potsdam
- 14476 Potsdam-Golm
- Germany
| | - André Laschewsky
- Institut für Chemie
- Universität Potsdam
- 14476 Potsdam-Golm
- Germany
- Fraunhofer Institute for Applied Polymer Research IAP
| | | | - Peter Müller-Buschbaum
- Physik-Department
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie
- Technische Universität München
- 85748 Garching
- Germany
| | - Christine M. Papadakis
- Physik-Department
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie
- Technische Universität München
- 85748 Garching
- Germany
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19
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Liu Z, Wickramasinghe SR, Qian X. Membrane chromatography for protein purifications from ligand design to functionalization. SEP SCI TECHNOL 2016. [DOI: 10.1080/01496395.2016.1223133] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Zizhao Liu
- Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas, USA
| | | | - Xianghong Qian
- Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas, USA
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