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Soto-Figueroa C, Galicia-García T, Rodríguez-Hidalgo MDR, Vicente L. Micellar shuttle of a polymeric ionic liquid (P(EHO)-CI-P(EtOx)) in a water/ethyl acetate two-phase system: Micellar load capacity and selective transfer of molecular anions. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111007] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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2
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Li M, Li D. Electrically controllable cargo delivery with dextran-rich droplets. J Colloid Interface Sci 2021; 582:102-111. [PMID: 32814218 DOI: 10.1016/j.jcis.2020.08.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 08/03/2020] [Accepted: 08/08/2020] [Indexed: 11/25/2022]
Abstract
The controllable delivery of cargo is of great importance in many areas, ranging from medicine and materials science to food and cosmetic industries. To fulfil the requirements in different areas, the development of new methods for cargo delivery in a controllable manner is always essential. A novel technique of cargo delivery controlled by electric pulse was developed in this paper. In an aqueous two-phase system, the dextran-rich droplets were fabricated as droplet carriers in a continuous polyethylene glycol-rich phase. The loading and releasing of model cargos (polystyrene particles) across the surface of the droplet carriers under electric pulses were demonstrated in microfluidic chips. By controlling the amplitude of the applied electric pulses, the cargos with designed sizes were sorted and loaded into the droplet carriers; hence, the targeted delivery of cargos by size can be achieved. The exchange of cargos between droplet carriers under reversed electric pulses was also investigated, and the results indicated the flexibility of this method in cargo delivery. Moreover, possible application of this method to biological cargos was demonstrated by controlling the loading and releasing of yeast cells under electric pulses. With the advantages of easy operation and fast response, this approach provides a novel route for controllable cargo delivery with droplets.
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Affiliation(s)
- Mengqi Li
- Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China; Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Dongqing Li
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
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Wiedmann S, Luitz M, Kerscher B, Lutz JF, Mülhaupt R. Programmable Thermoresponsive Micelle-Inspired Polymer Ionic Liquids as Molecular Shuttles for Anionic Payloads. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01621] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Steffen Wiedmann
- Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Str. 31, D-79104 Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, D-79104 Freiburg, Germany
- Freiburg Centre for Interactive Materials and Bioinspired Technologies (FIT), University of Freiburg, Georges-Köhler-Allee 105, D-79110 Freiburg, Germany
| | - Manuel Luitz
- Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Str. 31, D-79104 Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, D-79104 Freiburg, Germany
| | - Benjamin Kerscher
- Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Str. 31, D-79104 Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, D-79104 Freiburg, Germany
| | - Jean-François Lutz
- Institut Charles Sadron, CNRS, Université de Strasbourg, UPR22, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
| | - Rolf Mülhaupt
- Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Str. 31, D-79104 Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, D-79104 Freiburg, Germany
- Freiburg Centre for Interactive Materials and Bioinspired Technologies (FIT), University of Freiburg, Georges-Köhler-Allee 105, D-79110 Freiburg, Germany
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Li M, Li D. Bidirectional transfer of particles across liquid-liquid interface under electric pulse. J Colloid Interface Sci 2019; 560:436-446. [PMID: 31677817 DOI: 10.1016/j.jcis.2019.10.091] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 11/25/2022]
Abstract
HYPOTHESIS The controllable transfer of colloidal particles across liquid-liquid interfaces has attracted great interests in synthesis of new materials and stabilization of emulsions. Can we find new ways of controlled transferring particles across liquid-liquid interface with reversible transfer directions and size manipulation? EXPERIMENTS A technique of bidirectional transfer of colloidal particles in an aqueous two-phase system (ATPS) under electric pulse was developed. The influences of electric pulse, ATPS composition, surfactant concentration, ionic strength and particle size on the particle transfer were investigated systematically. FINDINGS Under electric pulses, particles overcome the energy barrier at the liquid-liquid interface and transfer into the other phase. The action of particle transfer is determined by the voltage of electric pulse, and the transfer direction is reversible by exchanging the direction of electric pulse. The ATPS composition, surfactant concentration, ionic strength and particle size affect the particle transfer by changing the free energy of particle detachment. With this method, the targeted transfer of particles by size can be realized by controlling the strength of electric pulse. The proposed method provides a promising technique for transfer of particles across liquid-liquid interface with advantages of fast response and precise control.
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Affiliation(s)
- Mengqi Li
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Dongqing Li
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
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Chancellor AJ, Seymour BT, Zhao B. Characterizing Polymer-Grafted Nanoparticles: From Basic Defining Parameters to Behavior in Solvents and Self-Assembled Structures. Anal Chem 2019; 91:6391-6402. [PMID: 31013073 DOI: 10.1021/acs.analchem.9b00707] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Polymer-grafted nanoparticles, often called hairy nanoparticles (HNPs), are an intriguing class of nanostructured hybrid materials with great potential in a variety of applications, including advanced polymer nanocomposite fabrication, drug delivery, imaging, and lubrication. This Feature provides an introduction to characterization of various aspects of HNPs, from basic defining parameters to behavior of HNPs in solvents and self-assembled structures of multicomponent brush nanoparticles, by using a broad range of analytical tools.
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Affiliation(s)
- Andrew J Chancellor
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Bryan T Seymour
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Bin Zhao
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
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Silva R, Poon R, Milne J, Syed A, Zhitomirsky I. New developments in liquid-liquid extraction, surface modification and agglomerate-free processing of inorganic particles. Adv Colloid Interface Sci 2018; 261:15-27. [PMID: 30293697 DOI: 10.1016/j.cis.2018.09.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 09/26/2018] [Accepted: 09/26/2018] [Indexed: 11/24/2022]
Abstract
This review describes new methods for the particle extraction through liquid-liquid interface (PELLI). The discovery of new surface modification techniques, advanced extractors and new adsorption mechanisms enabled novel applications of PELLI in nanotechnology of metals, quantum dots, oxides and hydroxides. Colloidal and interface chemistry of PELLI is emerging as a new area of technological and scientific interest. The progress achieved in the understanding of particle behavior and interactions at the liquid-liquid interface, phase transfer and interface reactions allowed for the development of new extraction mechanisms. An important breakthrough was the development of surface modification techniques for extraction of functional oxides. Especially important is the possibility of particle transfer from the synthesis medium to the device processing medium, which facilitates agglomerate-free processing of functional nanoparticles. Multifunctional extractor molecules were discovered and used as capping and reducing agents for particle synthesis or dispersing and charging agents for colloidal processing. The progress achieved in the development of extractors and extraction mechanisms has driven the advances in the surface modification and functionalization of materials. New PELLI techniques were used for the development of advanced materials and devices for optical, photovoltaic, energy storage, electronic, biomedical, sensor and other applications.
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Seymour BT, Wright RAE, Parrott AC, Gao H, Martini A, Qu J, Dai S, Zhao B. Poly(alkyl methacrylate) Brush-Grafted Silica Nanoparticles as Oil Lubricant Additives: Effects of Alkyl Pendant Groups on Oil Dispersibility, Stability, and Lubrication Property. ACS APPLIED MATERIALS & INTERFACES 2017; 9:25038-25048. [PMID: 28670899 DOI: 10.1021/acsami.7b06714] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This article reports on the synthesis of a series of poly(alkyl methacrylate) brush-grafted, 23 nm silica nanoparticles (hairy NPs) and the study of the effect of alkyl pendant length on their use as oil lubricant additives for friction and wear reduction. The hairy NPs were prepared by surface-initiated reversible addition-fragmentation chain transfer polymerization from trithiocarbonate chain transfer agent (CTA)-functionalized silica NPs in the presence of a free CTA. We found that hairy NPs with sufficiently long alkyl pendant groups (containing >8 carbon atoms, such as 12, 13, 16, and 18 in this study) could be readily dispersed in poly(alphaolefin) (PAO), forming clear, homogeneous dispersions, and exhibited excellent stability at low and high temperatures as revealed by visual inspection and dynamic light scattering studies. Whereas poly(n-hexyl methacrylate) hairy NPs cannot be dispersed in PAO under ambient conditions or at 80 °C, interestingly, poly(2-ethylhexyl methacrylate) hairy NPs can be dispersed in PAO at 80 °C but not at room temperature, with a reversible clear-to-cloudy transition observed upon cooling. High-contact-stress ball-on-flat reciprocating sliding tribological tests at 100 °C showed significant reductions in both the coefficient of friction (up to 38%) and wear volume (up to 90% for iron flat) for transparent, homogeneous dispersions of hairy NPs in PAO at a concentration of 1.0 wt % compared with neat PAO. The formation of a load-bearing tribofilm at the rubbing interface was confirmed using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy.
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Affiliation(s)
- Bryan T Seymour
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Roger A E Wright
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Alexander C Parrott
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Hongyu Gao
- Department of Mechanical Engineering, University of California , Merced, California 95343, United States
| | - Ashlie Martini
- Department of Mechanical Engineering, University of California , Merced, California 95343, United States
| | | | - Sheng Dai
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Bin Zhao
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
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Pearson S, St Thomas C, Guerrero-Santos R, D'Agosto F. Opportunities for dual RDRP agents in synthesizing novel polymeric materials. Polym Chem 2017. [DOI: 10.1039/c7py00344g] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dual RDRP agents provide access to new polymeric materials by combining ATRP, NMP, and RAFT polymerization without end group transformations.
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Affiliation(s)
- Samuel Pearson
- Équipe EPCP
- IPREM UMR 5254
- Université de Pau et des Pays de l'Adour (UPPA)
- 64053 Pau
- France
| | - Claude St Thomas
- Centro de Investigación en Química Aplicada (CIQA)
- Polymer Synthesis Department
- Coahuila
- México
| | - Ramiro Guerrero-Santos
- Centro de Investigación en Química Aplicada (CIQA)
- Polymer Synthesis Department
- Coahuila
- México
| | - Franck D'Agosto
- Univ Lyon
- Université Claude Bernard Lyon 1
- CPE Lyon
- CNRS
- UMR 5265
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Wright RAE, Henn DM, Zhao B. Thermally Reversible Physically Cross-Linked Hybrid Network Hydrogels Formed by Thermosensitive Hairy Nanoparticles. J Phys Chem B 2016; 120:8036-45. [DOI: 10.1021/acs.jpcb.6b06009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Roger A. E. Wright
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Daniel M. Henn
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Bin Zhao
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
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Quan X, Peng C, Dong J, Zhou J. Structural properties of polymer-brush-grafted gold nanoparticles at the oil-water interface: insights from coarse-grained simulations. SOFT MATTER 2016; 12:3352-3359. [PMID: 26954721 DOI: 10.1039/c5sm02721g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, the structural properties of amphiphilic polymer-brush-grafted gold nanoparticles (AuNPs) at the oil-water interface were investigated by coarse-grained simulations. The effects of grafting architecture (diblock, mixed and Janus brush-grafted AuNPs) and hydrophilicity of polymer brushes are discussed. Simulation results indicate that functionalized AuNPs present abundant morphologies including typical core-shell, Janus-type, jellyfish-like, etc., in a water or oil-water solvent environment. It is found that hydrophobic/weak hydrophilic polymer-brush-grafted AuNPs have better phase transfer performance, especially for AuNPs modified with hydrophobic chains as outer blocks and weak hydrophilic chains as inner blocks. This kind of AuNP can cross the interface region and move into the oil phase completely. For hydrophobic/strong hydrophilic polymer-brush-grafted AuNPs, they are trapped in the interface region instead of moving into any phase. The mechanism of phase transfer is ascribed to the flexibility and mobility of outer blocks. Besides, we study the desorption energy by PMF analysis. The results demonstrate that Janus brush-grafted AuNPs show the highest interfacial stability and activity, which can be further strengthened by increasing the hydrophilicity of grafted polymer brushes. This work will promote the industrial applications of polymer-brush-grafted NPs such as phase transfer catalysis and Pickering emulsion catalysis.
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Affiliation(s)
- Xuebo Quan
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab for Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, P. R. China.
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Wright RAE, Hu B, Henn DM, Zhao B. Reversible sol–gel transitions of aqueous dispersions of silica nanoparticles grafted with diblock copolymer brushes composed of a thermosensitive inner block and a charged outer block. SOFT MATTER 2015; 11:6808-6820. [DOI: 10.1039/c5sm00617a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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