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Aboudzadeh MA, Kruse J, Sanromán Iglesias M, Cangialosi D, Alegria A, Grzelczak M, Barroso-Bujans F. Gold nanoparticles endowed with low-temperature colloidal stability by cyclic polyethylene glycol in ethanol. SOFT MATTER 2021; 17:7792-7801. [PMID: 34368823 DOI: 10.1039/d1sm00720c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The colloidal stability of metal nanoparticles is tremendously dependent on the thermal behavior of polymer brushes. Neat polyethylene glycol (PEG) presents an unconventional upper critical solution temperature in ethanol, where phase segregation and crystallization coexist. This thermal behavior translated to a PEG brush has serious consequences on the colloidal stability in ethanol of gold nanoparticles (AuNPs) modified with PEG brushes upon cooling. We observed that AuNPs (13 nm diameter) stabilized with conventional linear PEG brushes (Mn = 6 and 11 kg mol-1) in ethanol suffer from reversible phase separation upon a temperature drop over the course of a few hours. However, the use of a polymer brush with cyclic topology as a stabilizer prevents sedimentation, ensuring the colloidal stability in ethanol at -25 °C for, at least, four months. We postulate that temperature-driven collapse of chain brushes promotes the interpenetration of linear chains, causing progressive AuNP sedimentation, a process that is unfavorable for cyclic polymer brushes whose topology prevents chain interpenetration. This study reinforces the notion about the importance of polymer topology on the colloidal stability of AuNPs.
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Affiliation(s)
- M Ali Aboudzadeh
- Donostia International Physics Center (DIPC), Paseo Manuel Lardizábal 4, 20018 Donostia-San Sebastián, Spain.
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Wang TW, Golder MR. Advancing macromolecular hoop construction: recent developments in synthetic cyclic polymer chemistry. Polym Chem 2021. [DOI: 10.1039/d0py01655a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Synthetic methodology to access cyclic macromolecules continues to develop via two distinct mechanistic classes: ring-expansion of macrocyclic initiators and ring-closure of functionalized linear polymers.
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Affiliation(s)
- Teng-Wei Wang
- Department of Chemistry
- University of Washington
- Seattle
- USA
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Aboudzadeh MA, Iturrospe A, Arbe A, Grzelczak M, Barroso-Bujans F. Cyclic Polyethylene Glycol as Nanoparticle Surface Ligand. ACS Macro Lett 2020; 9:1604-1610. [PMID: 35617061 DOI: 10.1021/acsmacrolett.0c00730] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cyclic polymers behave different than linear polymers due to the lack of end groups and smaller coil dimensions. Herein, we demonstrate that cyclic polyethylene glycol (PEG) can be used as an alternative of classical linear PEG ligands for gold nanoparticle (AuNP) stabilization. We observed that the brush height of cyclic PEG on AuNPs of diameter 4.4 and 13.2 nm increases identically as that of linear brushes with (Nσ1/2)0.7 (N, number of monomers in a chain and σ, grafting density) and that cyclic brushes are more stretched than their linear analogues when compared to their unperturbed dimensions. Such structural effect and the reduced footprint diameter in cyclic brushes with the entire chain in a concentrated polymer brush regime explains the distinct response of NPs to ionic strength and temperature, respectively, compared to linear analogues. These experiments are an important step in understanding the effect of polymer brush topology on colloidal properties.
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Affiliation(s)
- M. Ali Aboudzadeh
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel Lardizábal 5, 20018 Donostia−San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel Lardizábal 4, 20018 Donostia−San Sebastián, Spain
| | - Amaia Iturrospe
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel Lardizábal 5, 20018 Donostia−San Sebastián, Spain
| | - Arantxa Arbe
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel Lardizábal 5, 20018 Donostia−San Sebastián, Spain
| | - Marek Grzelczak
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel Lardizábal 5, 20018 Donostia−San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel Lardizábal 4, 20018 Donostia−San Sebastián, Spain
| | - Fabienne Barroso-Bujans
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel Lardizábal 5, 20018 Donostia−San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel Lardizábal 4, 20018 Donostia−San Sebastián, Spain
- IKERBASQUE - Basque Foundation for Science, María Díaz de Haro 3, E-48013 Bilbao, Spain
- Departamento de Polı́meros y Materiales Avanzados: Fı́sica, Quı́mica y Tecnologı́a, University of the Basque Country (UPV/EHU), Apartado 1072, 20080 Donostia−San Sebastián, Spain
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Hao QH, Cheng J, Liu LX, Tan HG, Wei T, Liu LY, Miao B. Surface Morphologies of Planar Ring Polyelectrolyte Brushes Induced by Trivalent Salts. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00507] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qing-Hai Hao
- College of Science, Civil Aviation University of China, Tianjin 300300, China
| | - Jie Cheng
- College of Science, Civil Aviation University of China, Tianjin 300300, China
| | - Li-Xiang Liu
- College of Science, Civil Aviation University of China, Tianjin 300300, China
| | - Hong-Ge Tan
- College of Science, Civil Aviation University of China, Tianjin 300300, China
| | - Tong Wei
- College of Science, Civil Aviation University of China, Tianjin 300300, China
| | - Li-Yan Liu
- College of Science, Civil Aviation University of China, Tianjin 300300, China
| | - Bing Miao
- Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
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Romio M, Trachsel L, Morgese G, Ramakrishna SN, Spencer ND, Benetti EM. Topological Polymer Chemistry Enters Materials Science: Expanding the Applicability of Cyclic Polymers. ACS Macro Lett 2020; 9:1024-1033. [PMID: 35648599 DOI: 10.1021/acsmacrolett.0c00358] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polymer-topology effects can alter technologically relevant properties when cyclic macromolecules are applied within diverse materials formulations. These include coatings, polymer networks, or nanostructures for delivering therapeutics. While substituting linear building blocks with cyclic analogues in commonly studied materials is itself of fundamental interest, an even more fascinating observation has been that the introduction of physical or chemical boundaries (e.g., a grafting surface or cross-links) can amplify the topology-related effects observed when employing cyclic polymer-based precursors for assembling multidimensional objects. Hence, the application of cyclic polymers has enabled the fabrication of coatings with enhanced biorepellency and superior lubricity, broadened the tuning potential for mechanical properties of polymer networks, increased the thermodynamic stability, and altered the capability of loading and releasing drugs within polymeric micelles.
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Affiliation(s)
- Matteo Romio
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
- Biointerfaces, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
| | - Lucca Trachsel
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
- Tissue Engineering + Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zürich, 8093 Zürich, Switzerland
| | - Giulia Morgese
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Shivaprakash N. Ramakrishna
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Nicholas D. Spencer
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Edmondo M. Benetti
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
- Biointerfaces, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
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