1
|
Guo Y, Zhang X, Wang X, Zhang L, Xu Z, Sun D. Nanoemulsions Stable against Ostwald Ripening. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1364-1372. [PMID: 38175958 DOI: 10.1021/acs.langmuir.3c03019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Ostwald ripening, the dominant mechanism of droplet size growth for an O/W nanoemulsion at high surfactant concentrations, depends on micelles in the water phase and high aqueous solubility of oil, especially for spontaneously formed nanoemulsions. In our study, O/W nanoemulsions were formed spontaneously by mixing a water phase with an oil phase containing fatty alcohol polyoxypropylene polyoxyethylene ether (APE). By monitoring periodically the droplet size of the nanoemulsions via dynamic light scattering, we demonstrated that the formed O/W nanoemulsions are stable against Ostwald ripening, i.e., droplet growth. In contrast, the nanoemulsion droplets grew with the addition of micelles, demonstrating the pivotal role of the presence of micelles in the water phase in the occurrence of Ostwald ripening. The influence of the initial phase of APE, the oil or water phase in which APE is present, on the micelle formation is discussed by the partition coefficient and interfacial adsorption of APE between the oil and water phase using a surface and interfacial tensiometer. In addition, the spontaneously formed O/W nanoemulsion, which is stable against Ostwald ripening, can be used as a nanocarrier for the delivery of water-insoluble pesticides. These results provide a novel approach for the preparation of stable nanoemulsions and contribute to elucidating the mechanism of instability of nanoemulsions.
Collapse
Affiliation(s)
- Yanlin Guo
- Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100, P. R. China
| | - Xinpeng Zhang
- Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100, P. R. China
| | - Xiaohan Wang
- Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100, P. R. China
| | - Li Zhang
- Shandong Analysis and Test Centre, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250014, PR China
| | - Zhenghe Xu
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
| | - Dejun Sun
- Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100, P. R. China
| |
Collapse
|
2
|
Lahasky SH, Barker EM, Caixeta Guimarães J, da Silva Salvato RCJP. Dynamic salinity‐induced phase‐inversion conductivity measurements used to characterize alcohol ethoxylate based surfactant/oil/water systems. J SURFACTANTS DETERG 2022. [DOI: 10.1002/jsde.12638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
| | - Emily M. Barker
- Research & Development Center Oxiteno‐USA Hattiesburg Mississippi
| | | | | |
Collapse
|
3
|
Lei T, Wang Y, Zhang H, Cao J, Xiao C, Ding M, Chen W, Chen M, Zhang Z. Preparation and performance evaluation of a branched functional polymer for heavy oil recovery. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
4
|
CMC determination using isothermal titration calorimetry for five industrially significant non-ionic surfactants. Colloids Surf B Biointerfaces 2022; 211:112320. [PMID: 35042120 DOI: 10.1016/j.colsurfb.2022.112320] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 01/04/2022] [Accepted: 01/05/2022] [Indexed: 11/20/2022]
Abstract
Surfactants are used in a vast array of products including pharmaceuticals, cosmetics and household formulations. From an industrial perspective, non-ionic surfactants are ideal for inclusion within such products as they are non-toxic, simple to formulate and economic to use. This study considers five non-ionic surfactants (Tween 20, Tween 80, Crodasol, Croduret and Etocas 35) to determine the critical micellar concentration (CMC) for each using isothermal titration calorimetry, thus avoiding issues regarding poor accuracy found with other techniques. Furthermore, this methodology has not previously been applied to this group of surfactants. For the most commonly used non-ionics (Tween 20 and Tween 80) a further study was undertaken to consider the influence of surfactant purity on the CMC determined, using standard grade (Tween 20 and 80), high purity (Tween 20 HP and Tween 80 HP) and Super Refined (SR PS20 and SR PS80). Results permitted calculation of the CMC for the surfactants whereupon the values were determined to range from 1.0 mM for Tween 20 HP to 2.9 mM for Tween 80 HP. Such information regarding the CMC event is useful from a formulation perspective as it can ensure that the most optimum concentration of surfactant is included within a formulation to maximize its efficacy.
Collapse
|
5
|
Li P, Zhang F, Gong Y, Tang J, Zhang C, Sun Z, Liu G, Li X. Synthesis and properties of functional polymer for heavy oil viscosity reduction. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115635] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
6
|
Kumar N, Mandal A. Wettability alteration of sandstone rock by surfactant stabilized nanoemulsion for enhanced oil recovery—A mechanistic study. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125043] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
7
|
Caciagli A, Zupkauskas M, Levin A, Knowles TPJ, Mugemana C, Bruns N, O'Neill T, Frith WJ, Eiser E. DNA-Coated Functional Oil Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10073-10080. [PMID: 30086643 DOI: 10.1021/acs.langmuir.8b01828] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Many industrial soft materials include oil-in-water (O/W) emulsions at the core of their formulations. By using tuneable interface stabilizing agents, such emulsions can self-assemble into complex structures. DNA has been used for decades as a thermoresponsive, highly specific binding agent between hard and, recently, soft colloids. Up until now, emulsion droplets functionalized with DNA had relatively low coating densities and were expensive to scale up. Here, a general O/W DNA-coating method using functional nonionic amphiphilic block copolymers, both diblock and triblock, is presented. The hydrophilic poly(ethylene glycol) ends of the surfactants are functionalized with azides, allowing for efficient, dense, and controlled coupling of dibenzocyclooctane-functionalized DNA to the polymers through a strain-promoted alkyne-azide click reaction. The protocol is readily scalable due to the triblock's commercial availability. Different production methods (ultrasonication, microfluidics, and membrane emulsification) are used with different oils (hexadecane and silicone oil) to produce functional droplets in various size ranges (submicron, ∼20 and >50 μm), showcasing the generality of the protocol. Thermoreversible submicron emulsion gels, hierarchical "raspberry" droplets, and controlled droplet release from a flat DNA-coated surface are demonstrated. The emulsion stability and polydispersity is evaluated using dynamic light scattering and optical microscopy. The generality and simplicity of the method opens up new applications in soft matter, biotechnological research, and industrial advances.
Collapse
Affiliation(s)
- Alessio Caciagli
- Optoelectronics Group, Cavendish Laboratory , University of Cambridge , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
| | - Mykolas Zupkauskas
- Optoelectronics Group, Cavendish Laboratory , University of Cambridge , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
| | - Aviad Levin
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , U.K
| | - Tuomas P J Knowles
- Optoelectronics Group, Cavendish Laboratory , University of Cambridge , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , U.K
| | - Clément Mugemana
- Adolphe Merkle Institute , Chemin des Verdiers 4 , Fribourg CH-1700 , Switzerland
| | - Nico Bruns
- Adolphe Merkle Institute , Chemin des Verdiers 4 , Fribourg CH-1700 , Switzerland
| | - Thomas O'Neill
- Optoelectronics Group, Cavendish Laboratory , University of Cambridge , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
| | - William J Frith
- Unilever R&D Colworth , Colworth Science Park , Sharnbrook MK44 1LQ , Bedfordshire , U.K
| | - Erika Eiser
- Optoelectronics Group, Cavendish Laboratory , University of Cambridge , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
| |
Collapse
|
8
|
Hydrophobically modified dextrans as stabilizers for O/W highly concentrated emulsions. Comparison with commercial non-ionic polymeric stabilizers. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.04.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
9
|
Azizi K, Nikazar M. Emulsification and analyzing of oil in water emulsion by implementation of image processing method. PARTICULATE SCIENCE AND TECHNOLOGY 2016. [DOI: 10.1080/02726351.2015.1099581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
10
|
Debon AP, Wootton RCR, Elvira KS. Droplet confinement and leakage: Causes, underlying effects, and amelioration strategies. BIOMICROFLUIDICS 2015; 9:024119. [PMID: 26015831 PMCID: PMC4409622 DOI: 10.1063/1.4917343] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 03/31/2015] [Indexed: 05/04/2023]
Abstract
The applicability of droplet-based microfluidic systems to many research fields stems from the fact that droplets are generally considered individual and self-contained reaction vessels. This study demonstrates that, more often than not, the integrity of droplets is not complete, and depends on a range of factors including surfactant type and concentration, the micro-channel surface, droplet storage conditions, and the flow rates used to form and process droplets. Herein, a model microfluidic device is used for droplet generation and storage to allow the comparative study of forty-four different oil/surfactant conditions. Assessment of droplet stability under these conditions suggests a diversity of different droplet failure modes. These failure modes have been classified into families depending on the underlying effect, with both numerical and qualitative models being used to describe the causative effect and to provide practical solutions for droplet failure amelioration in microfluidic systems.
Collapse
Affiliation(s)
- Aaron P Debon
- Institute for Chemical and Bioengineering , Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
| | - Robert C R Wootton
- Institute for Chemical and Bioengineering , Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
| | - Katherine S Elvira
- Institute for Chemical and Bioengineering , Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
| |
Collapse
|
11
|
Ziani K, Barish JA, McClements DJ, Goddard JM. Manipulating interactions between functional colloidal particles and polyethylene surfaces using interfacial engineering. J Colloid Interface Sci 2011; 360:31-8. [DOI: 10.1016/j.jcis.2011.04.057] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Revised: 02/25/2011] [Accepted: 04/16/2011] [Indexed: 10/18/2022]
|
12
|
Size-distribution of droplets in emulsions by statistical mechanics calculation. J Colloid Interface Sci 2011; 360:256-61. [DOI: 10.1016/j.jcis.2011.04.054] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2010] [Revised: 02/08/2011] [Accepted: 04/14/2011] [Indexed: 11/20/2022]
|
13
|
Zhu W, Yang H, Yu Y, Hua L, Li H, Feng B, Hou Z. Amphiphilic ionic liquid stabilizing palladium nanoparticles for highly efficient catalytic hydrogenation. Phys Chem Chem Phys 2011; 13:13492-500. [PMID: 21566847 DOI: 10.1039/c1cp20255c] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The highly water-soluble palladium nanoparticles (NPs) were synthesized by using the amphiphilic poly(ethylene glycol)-functionalized dicationic imidazolium-based ionic liquid (C(12)Im-PEG IL) as a stabilizing agent. The aqueous dispersed palladium NPs in the range of 1.9 ± 0.3 nm were observed by transmission electron microscopy (TEM). The physicochemical properties of C(12)Im-PEG IL in aqueous phase have been characterized by electrical conductivity, surface tension and dynamic light scattering (DLS) measurements. It was demonstrated that the amphiphilic ionic liquid can form micelles above its critical micelle concentration (CMC) in aqueous solution and the micelles played a crucial role in stabilizing the palladium NPs and thus promoted catalytic hydrogenation. Furthermore, the dicationic ionic liquid can also act as a gemini surfactant and generated emulsion between hydrophobic substrates and the catalytic aqueous phase during the reaction. The aqueous dispersed palladium NPs showed efficient activity for the catalytic hydrogenation of various substrates under very mild conditions and the stabilizing Pd(0) nanoparticles (NPs) can be reused at least eight times with complete conservation of activity.
Collapse
Affiliation(s)
- Wenwen Zhu
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237, China
| | | | | | | | | | | | | |
Collapse
|