51
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Lee M, Lee EY, Lee D, Park BJ. Stabilization and fabrication of microbubbles: applications for medical purposes and functional materials. SOFT MATTER 2015; 11:2067-79. [PMID: 25698443 DOI: 10.1039/c5sm00113g] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Microbubbles with diameters ranging from a few micrometers to tens of micrometers have garnered significant attention in various applications including food processing, water treatment, enhanced oil recovery, surface cleaning, medical purposes, and material preparation fields with versatile functionalities. A variety of techniques have been developed to prepare microbubbles, such as ultrasonication, excimer laser ablation, high shear emulsification, membrane emulsification, an inkjet printing method, electrohydrodynamic atomization, template layer-by-layer deposition, and microfluidics. Generated bubbles should be immediately stabilized via the adsorption of stabilizing materials (e.g., surfactants, lipids, proteins, and solid particles) onto the gas-liquid interface to lower the interfacial tension. Such adsorption of stabilizers prevents coalescence between the microbubbles and also suppresses gas dissolution and resulting disproportionation caused by the presence of the Laplace overpressure across the gas-liquid interface. Herein, we comprehensively review three important topics of microbubbles: stabilization, fabrication, and applications.
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Affiliation(s)
- Mina Lee
- Department of Chemical Engineering, Kyung Hee University, Yongin, 446-701, South Korea.
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52
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Fujii S, Akiyama K, Nakayama S, Hamasaki S, Yusa SI, Nakamura Y. pH- and temperature-responsive aqueous foams stabilized by hairy latex particles. SOFT MATTER 2015; 11:572-579. [PMID: 25426611 DOI: 10.1039/c4sm02236j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polystyrene (PS) particles carrying pH- and temperature-responsive poly[2-(dimethylamino)ethyl methacrylate] (PDMA) hairs (PDMA-PS particles) were synthesized by dispersion polymerization. The diameter, diameter distribution, morphology, chemical composition and surface chemistry of the particles were characterized using scanning electron microscopy (SEM), elemental microanalysis, dynamic light scattering and zeta potential measurements. The hydrophilicity-hydrophobicity balance of the PDMA could be tuned by varying both pH and temperature and therefore these sterically stabilized particles acted as doubly stimuli-responsive stabilizers for aqueous foams by adsorption and desorption to/from the air-water interface. At and above pH 6.0, in which range the PDMA hairs were either non-protonated or partially protonated, particle-stabilized foams were formed at both 23 and 55 °C. The foam prepared at 55 °C was the more stable of the two, lasting for at least 24 h, whereas the 23 °C foam destabilized within 24 h. SEM studies indicated that the particles adsorbed at the air-water interface as monolayers at 23 °C and as multilayers at 55 °C. At and below pH 5, in which range the hairs were cationic, hydrophilic and water-soluble, no foam was formed irrespective of temperature. Rapid defoaming could be induced by lowering the solution pH at both temperatures, due to rapid in situ protonation of the PDMA hairs, prompting the PDMA-PS particles to desorb from the air-water interface. The foaming and defoaming cycles could be repeated at least five times.
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Affiliation(s)
- Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.
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53
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Dhakate SR, Subhedar KM, Singh BP. Polymer nanocomposite foam filled with carbon nanomaterials as an efficient electromagnetic interference shielding material. RSC Adv 2015. [DOI: 10.1039/c5ra03409d] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Among different carbon nanomaterial foam-filled polymer composites, graphene-based foam gives superior specific shielding effectiveness when compared to typical metals.
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Affiliation(s)
- Sanjay R. Dhakate
- Physics and Engineering of Carbon
- Division of Materials Physics and Engineering
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-National Physical Laboratory
- New Delhi-12
| | - Kiran M. Subhedar
- Physics and Engineering of Carbon
- Division of Materials Physics and Engineering
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-National Physical Laboratory
- New Delhi-12
| | - Bhanu Pratap Singh
- Physics and Engineering of Carbon
- Division of Materials Physics and Engineering
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-National Physical Laboratory
- New Delhi-12
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54
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Bournival G, Du Z, Ata S, Jameson G. Foaming and gas dispersion properties of non-ionic frothers in the presence of hydrophobized submicron particles. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.minpro.2014.08.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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55
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Fameau AL, Carl A, Saint-Jalmes A, von Klitzing R. Responsive Aqueous Foams. Chemphyschem 2014; 16:66-75. [DOI: 10.1002/cphc.201402580] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Indexed: 12/30/2022]
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56
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Maestro A, Rio E, Drenckhan W, Langevin D, Salonen A. Foams stabilised by mixtures of nanoparticles and oppositely charged surfactants: relationship between bubble shrinkage and foam coarsening. SOFT MATTER 2014; 10:6975-83. [PMID: 24832218 DOI: 10.1039/c4sm00047a] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We have studied foams stabilised by surfactant-decorated nanoparticles adsorbed at the bubble surfaces. We show that the controlled compression of a single bubble allows one to understand the coarsening behavior of these foams. When bubbles are compressed, the particles become tightly packed in the surface layer. They lose their mobility, and the interface becomes solid-like when the jammed state is reached. Further compression leads to interfacial buckling characterised by crumpled surfaces. We find that the surface concentration of particles at which the jamming and the buckling transitions occur are independent of the surfactant concentration. This is a surprising feature. It suggests that the surfactants are mandatory to help the particles adsorb at the interface and that they change the equilibrium surface concentration of the decorated particles. But they do not affect the surface properties once the particles are adsorbed. We measured the compression elastic modulus of the surface in the jammed state and found it to be compatible with the Gibbs condition for which the spontaneous dissolution of bubbles is arrested. Due to this effect, the coarsening process of a foam composed of many close-packed bubbles occurs in two steps. In the first step, coarsening is slow and coalescence of the bigger bubbles is observed. In the second step, a number of very small bubbles remains, which exhibit crumpled surfaces and are stable over long times. This suggests that foam coarsening is arrested once the smallest bubbles become fully covered after the initial shrinking step.
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Affiliation(s)
- Armando Maestro
- Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Sud XI, 91405-Orsay, France.
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57
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Evaluating the stability of colloidal gas aphrons in the presence of montmorillonite nanoparticles. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.076] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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58
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Maestro A, Guzmán E, Ortega F, Rubio RG. Contact angle of micro- and nanoparticles at fluid interfaces. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.04.008] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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59
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Whitby CP, Krebsz M. Coalescence in concentrated Pickering emulsions under shear. SOFT MATTER 2014; 10:4848-4854. [PMID: 24862445 DOI: 10.1039/c4sm00491d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We have investigated the rheology of concentrated oil-in-water emulsions stabilised by silanised silica nanoparticles. The emulsions behave like highly elastic solids in response to small, uniform strains. They become unstable and begin to break down, however, on yielding. We show that the emulsion elasticity is correlated with the salt concentration in the water and hence the particle aggregation in emulsions at a given drop volume fraction. A supporting observation is that destabilisation is favoured by minimising the attractive interactions between the particles. Microscopic observations revealed that coalesced drops have anisotropic shapes and wrinkled surfaces, direct evidence of the interfacial particle layer acting like a mechanical barrier to bulk emulsion destabilisation.
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Affiliation(s)
- Catherine P Whitby
- Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.
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60
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Ettelaie R, Murray B. Effect of particle adsorption rates on the disproportionation process in pickering stabilised bubbles. J Chem Phys 2014; 140:204713. [DOI: 10.1063/1.4878501] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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61
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Zang D, Lin K, Wang W, Gu Y, Zhang Y, Geng X, Binks BP. Tunable shape transformation of freezing liquid water marbles. SOFT MATTER 2014; 10:1309-1314. [PMID: 24651262 DOI: 10.1039/c3sm51885j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Liquid water marbles coated with fumed silica nanoparticles exhibit various shape transformations upon freezing which are dependent on the hydrophobicity of the nanoparticles. The shape can be recovered during re-melting. For marbles coated with the most hydrophobic particles, a vertically prolonged morphology with a pointed protrusion on the top is formed on freezing. For marbles coated with less hydrophobic particles, a lateral expanded flying saucer-shaped morphology is formed. The different responses to freezing result from the different heterogeneous nucleation sites owing to the different positions of the particles at the air-water interface. If the particles are more immersed in water, ice embryos tend to form in the concave cavities between the particles. The volume expansion of water caused by freezing and continuous nucleation lead to continuous lateral stretching of the particle network coating the droplet surface and ultimately to the horizontally inflated shape of the marble. If the particles are more exposed to air, nucleation occurs on the convex surface of the particles, similar to that of a bare water droplet on a hydrophobic substrate.
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Affiliation(s)
- Duyang Zang
- Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, 710129, China.
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62
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Rio E, Drenckhan W, Salonen A, Langevin D. Unusually stable liquid foams. Adv Colloid Interface Sci 2014; 205:74-86. [PMID: 24342735 DOI: 10.1016/j.cis.2013.10.023] [Citation(s) in RCA: 145] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 10/21/2013] [Accepted: 10/21/2013] [Indexed: 11/28/2022]
Abstract
Obtaining stable liquid foams is an important issue in view of their numerous applications. In some of these, the liquid foam in itself is of interest, in others, the liquid foam acts as a precursor for the generation of solid foam. In this short review, we will make a survey of the existing results in the area. This will include foams stabilised by surfactants, proteins and particles. The origin of the stability is related to the slowing down of coarsening, drainage or coalescence, and eventually to their arrest. The three effects are frequently coupled and in many cases, they act simultaneously and enhance one another. Drainage can be arrested if the liquid of the foam either gels or solidifies. Coalescence is slowed down by gelified foam films, and it can be arrested if the films become very thick and/or rigid. These mechanisms are thus qualitatively easy to identify, but they are less easy to model in order to obtain quantitative predictions. The slowing down of coarsening requests either very thick or small films, and its arrest was observed in cases where the surface compression modulus was large. The detail of the mechanisms at play remains unclear.
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Affiliation(s)
- Emmanuelle Rio
- Laboratoire de Physique des Solides, Université Paris-Sud 11, UMR CNRS 8502, Bâtiment 510, 91405 Orsay Cedex, France
| | - Wiebke Drenckhan
- Laboratoire de Physique des Solides, Université Paris-Sud 11, UMR CNRS 8502, Bâtiment 510, 91405 Orsay Cedex, France
| | - Anniina Salonen
- Laboratoire de Physique des Solides, Université Paris-Sud 11, UMR CNRS 8502, Bâtiment 510, 91405 Orsay Cedex, France
| | - Dominique Langevin
- Laboratoire de Physique des Solides, Université Paris-Sud 11, UMR CNRS 8502, Bâtiment 510, 91405 Orsay Cedex, France
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63
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Bernal MM, Martin-Gallego M, Molenberg I, Huynen I, López Manchado MA, Verdejo R. Influence of carbon nanoparticles on the polymerization and EMI shielding properties of PU nanocomposite foams. RSC Adv 2014. [DOI: 10.1039/c3ra45607b] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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64
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Tan SY, Ata S, Wanless EJ. Direct observation of individual particle armored bubble interaction, stability, and coalescence dynamics. J Phys Chem B 2013; 117:8579-88. [PMID: 23796213 DOI: 10.1021/jp402052f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interactions between two individual particle-stabilized bubbles were investigated, in the absence of surfactant, using a combination of coalescence rig and high-speed video camera. This combination allows the visualization of bubble coalescence dynamics which provide information on bubble stability. Experimental data suggested that bubble stability is enhanced by both the adsorption of particles at the interface as indicated by the long induction time and the increase in damping coefficient at high surface coverage. The interaction between an armored bubble and a bare bubble (asymmetric interaction) can be destabilized through the addition of a small amount of salt, which suggested that electrostatic interactions play a significant role in bubble stability. Interestingly, the DLVO theory cannot be used to describe the bubble stability in the case of a symmetric interaction as coalescence was inhibited at 0.1 M KCl in both the absence and presence of particles at the interfaces. Furthermore, bubbles can also be destabilized by increasing the particle hydrophobicity. This behavior is due to thinner liquid films between bubbles and an increase in film drainage rate. The fraction of particles detached from the bubble surface after film rupture was found to be very similar within the range of solution ionic strength, surface coverage, and particle hydrophobicity studied. This lack of dependence implies that the kinetic energy generated by the coalescing bubbles is larger than the attachment energy of the particles and dominates the detachment process. This study illuminates the stability behavior of individual particle-stabilized bubbles and has potential impact on processes which involve their interaction.
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Affiliation(s)
- Sin-Ying Tan
- Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan NSW 2308, Australia
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65
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Li H, Liu W, Zhang W, Qian K, Wang H. Laponite and PAS costabilized ASA emulsion with high hydrolysis resistance and sizing efficiency. J Appl Polym Sci 2013. [DOI: 10.1002/app.39045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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66
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67
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Formation and stability of foams stabilized by fine particles with similar size, contact angle and different shapes. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.09.023] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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68
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Zang D, Rio E, Delon G, Langevin D, Wei B, Binks B. Influence of the contact angle of silica nanoparticles at the air–water interface on the mechanical properties of the layers composed of these particles. Mol Phys 2011. [DOI: 10.1080/00268976.2010.542778] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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69
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Zhou J, Qiao X, Binks BP, Sun K, Bai M, Li Y, Liu Y. Magnetic Pickering emulsions stabilized by Fe3O4 nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:3308-3316. [PMID: 21344923 DOI: 10.1021/la1036844] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Superparamagnetic Fe(3)O(4) nanoparticles prepared by a classical coprecipitation method were used as the stabilizer to prepare magnetic Pickering emulsions, and the effects of particle concentration, oil/water volume ratio, and oil polarity on the type, stability, composition, and morphology of these functional emulsions were investigated. The three-phase contact angle (θ(ow)) of the Fe(3)O(4) nanoparticles at the oil-water interface was evaluated using the Washburn method, and the results showed that for nonpolar and weakly polar oils of dodecane and silicone, θ(ow) is close to 90°, whereas for strongly polar oils of butyl butyrate and 1-decanol, θ(ow) is far below 90°. Inherently hydrophilic Fe(3)O(4) nanoparticles can be used to prepare stable dodecane-water and silicone-water emulsions, but they cannot stabilize butyl butyrate-water and decanol-water mixtures with macroscopic phase separation occurring, which is in good agreement with the contact angle data. Emulsions are of the oil-in-water type for both dodecane and silicone oil, and the average droplet size increases with an increase in the oil volume fraction. For stable emulsions, not all of the particles are adsorbed to drop interfaces; the fraction adsorbed decreases with an increase in the initial oil volume fraction. Changes in the particle concentration have no obvious influence on the stability of these emulsions, even though the droplet size decreases with concentration.
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Affiliation(s)
- Jun Zhou
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China
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70
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Zhu Y, Zhang S, Chen J, Hu CP. High internal phase emulsions prepared with poly(urethane urea) aqueous nanodispersion at different temperatures. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24221] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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71
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72
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Liu Q, Luan L, Sun D, Xu J. Aqueous foam stabilized by plate-like particles in the presence of sodium butyrate. J Colloid Interface Sci 2010; 343:87-93. [DOI: 10.1016/j.jcis.2009.10.081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Revised: 10/08/2009] [Accepted: 10/31/2009] [Indexed: 10/20/2022]
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73
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Liu Q, Zhang S, Sun D, Xu J. Foams stabilized by Laponite nanoparticles and alkylammonium bromides with different alkyl chain lengths. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2009.12.003] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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74
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Binks BP, Fletcher PD, Holt BL, Kuc O, Beaussoubre P, Wong K. Compositional ripening of particle- and surfactant-stabilised emulsions: a comparison. Phys Chem Chem Phys 2010; 12:2219-26. [DOI: 10.1039/b918812f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Campbell AL, Stoyanov SD, Paunov VN. Novel Multifunctional Micro-Ampoules for Structuring and Encapsulation. Chemphyschem 2009; 10:2599-602. [DOI: 10.1002/cphc.200900317] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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76
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Hunter TN, Jameson GJ, Wanless EJ, Dupin D, Armes SP. Adsorption of submicrometer-sized cationic sterically stabilized polystyrene latex at the air-water interface: contact angle determination by ellipsometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3440-3449. [PMID: 19708141 DOI: 10.1021/la803879p] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Near-monodisperse, sterically stabilized cationic polystyrene latexes of either 122 or 310 nm diameter were prepared by aqueous emulsion polymerization using cheap, readily available reagents. At low pH, these latexes stabilized foams prepared by either hand-shaking or by using a foam column. SEM studies confirmed that the dried foam mainly comprised well-defined bilayers, which suggests that each air bubble is stabilized with a latex monolayer. Adsorption of the same latexes at the planar air-water interface was studied using the Langmuir-Blodgett trough technique. Surface pressure isotherms confirmed particle desorption from the interface on repeated compression of the latex monolayers. For the 122 nm latex at pH 2, ellipsometric analysis enabled a contact angle of approximately 43 degrees to be calculated from a simple two-layer model, which suggests that these particles have only moderate wettability. Similar results were obtained for the 310 nm latex, but the data were much less reliable in this case due to additional background particle scattering.
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Affiliation(s)
- Timothy N Hunter
- Department of Chemical Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
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77
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Vijayaraghavan K, Nikolov A, Wasan D, Henderson D. Foamability of Liquid Particle Suspensions: A Modeling Study. Ind Eng Chem Res 2009. [DOI: 10.1021/ie801741q] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Krishna Vijayaraghavan
- Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, and Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 75202
| | - Alex Nikolov
- Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, and Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 75202
| | - Darsh Wasan
- Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, and Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 75202
| | - Douglas Henderson
- Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, and Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 75202
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78
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Liu Q, Zhang S, Sun D, Xu J. Aqueous foams stabilized by hexylamine-modified Laponite particles. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.12.035] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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79
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Effect of esterically bonded agents on the monolayer structure and foamability of nano-silica. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.10.039] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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80
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Zang D, Stocco A, Langevin D, Wei B, Binks BP. An ellipsometry study of silica nanoparticle layers at the water surface. Phys Chem Chem Phys 2009; 11:9522-9. [DOI: 10.1039/b907903c] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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81
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Zhang S, Sun D, Dong X, Li C, Xu J. Aqueous foams stabilized with particles and nonionic surfactants. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2008.03.020] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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82
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Hansen BB, Kiil S, Johnsson JE, Sønder KB. Foaming in Wet Flue Gas Desulfurization Plants: The Influence of Particles, Electrolytes, and Buffers. Ind Eng Chem Res 2008. [DOI: 10.1021/ie071660g] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian B. Hansen
- Department of Chemical and Biochemical Engineering, Technical University of Denmark Building 229, DK-2800 Kgs. Lyngby, Denmark
| | - Søren Kiil
- Department of Chemical and Biochemical Engineering, Technical University of Denmark Building 229, DK-2800 Kgs. Lyngby, Denmark
| | - Jan E. Johnsson
- Department of Chemical and Biochemical Engineering, Technical University of Denmark Building 229, DK-2800 Kgs. Lyngby, Denmark
| | - Klaus B. Sønder
- Department of Chemical and Biochemical Engineering, Technical University of Denmark Building 229, DK-2800 Kgs. Lyngby, Denmark
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83
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Hunter TN, Pugh RJ, Franks GV, Jameson GJ. The role of particles in stabilising foams and emulsions. Adv Colloid Interface Sci 2008; 137:57-81. [PMID: 17904510 DOI: 10.1016/j.cis.2007.07.007] [Citation(s) in RCA: 518] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2007] [Accepted: 07/31/2007] [Indexed: 11/21/2022]
Abstract
The use of particles as foam and emulsion stabilising species, with or without surfactants, has received great interest in recent years. The majority of work has studied the effects of particles as stabilisers in emulsion systems, but recent successes has widened consideration into foams, where industries such as flotation and food processing have encountered the effects of particle stabilisation for many years. This review seeks to clarify studies into emulsions, highlighting new research in this area, and relate similarities and differences to foam systems. Past research has focused on defining the interaction mechanisms of stability, such as principles of attachment energies, particle-particle forces at the interface and changes to the interfilm, with a view to ascertain conditions giving optimum stability. Studied conditions include effects of particle contact angle, aggregation formations, concentration, size and interactions of other species (i.e. surfactant). Mechanisms can be complex, but overall the principle of particles creating a steric barrier to coalescence, is a straitforward basis of interaction. Much research in emulsions can be applied to foam systems, however evidence would suggest foam systems are under a number of additional constraints, and the stability 'window' for particles is smaller, in terms of size and contact angle ranges. Also, because of increased density differences and interfilm perturbations in foam systems, retardation of drainage is often as important to stability as inhibiting coalescence.
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Affiliation(s)
- Timothy N Hunter
- Centre for Multiphase Processes, The University of Newcastle, Callaghan, NSW 2308, Australia
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84
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Zhang S, Lan Q, Liu Q, Xu J, Sun D. Aqueous foams stabilized by Laponite and CTAB. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2007.11.010] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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85
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Campbell AL, Holt BL, Stoyanov SD, Paunov VN. Scalable fabrication of anisotropic micro-rods from food-grade materials using an in shear flow dispersion–solvent attrition technique. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b807738j] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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86
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Safouane M, Langevin D, Binks BP. Effect of particle hydrophobicity on the properties of silica particle layers at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:11546-11553. [PMID: 17918972 DOI: 10.1021/la700800a] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This article describes a study of fumed silica particle layers adsorbed at the air-water interface. We have performed surface pressure, ellipsometry, and Brewster angle microscopy measurements. These determinations were complemented by surface viscoelasticity studies, using capillary waves to measure the compression moduli and an oscillating disc to measure the shear moduli. Our results show a strong influence of the particle hydrophobicity and surface density on the properties of the layers. Under compression-expansion, the particle layers rearrange quasi-instantaneously, and at high density, they buckle and/or collapse. Shear measurements show a transition from viscous to elastic behavior for particles with contact angles close to 90 degrees. The surface compression moduli are quite small and most likely not related to the stability of the foams made with these particles, in contrast to the case of more common surfactant foams.
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Affiliation(s)
- M Safouane
- Laboratoire de Physique des Solides, Université Paris 11, 91405 Orsay, France
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87
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Binks BP, Duncumb B, Murakami R. Effect of pH and salt concentration on the phase inversion of particle-stabilized foams. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:9143-6. [PMID: 17683150 DOI: 10.1021/la701393w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The effect of pH and salt concentration on the phase inversion of silica particle-stabilized foams is presented. Inversion from a water-in-air powder to an air-in-water foam can be achieved by increasing the pH of the aqueous phase. By contrast, an increase in the salt concentration causes a nonfoaming aqueous dispersion to foam. The results are rationalized in terms of changes in the hydrophobicity of the solid surfaces, probed by measurement of the contact angles of water drops on hydrophobized glass slides in air.
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Affiliation(s)
- Bernard P Binks
- Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull, UK.
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88
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Binks BP, Murakami R, Armes SP, Fujii S, Schmid A. pH-responsive aqueous foams stabilized by ionizable latex particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:8691-4. [PMID: 17658859 DOI: 10.1021/la700444a] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We have designed a type of colloidal particle whose surface characteristics are sensitive to the pH of the aqueous phase in which they are dispersed. Particles of polystyrene latex stabilized by poly(acrylic acid) can act as stabilizers of aqueous foams by adsorbing at the air-water surface. Foams can be prepared and stabilized only at pH values below the isoelectric point where particles are either uncharged and flocculated or acquire a positive charge. At high pH where particles are anionic, no foam forms. This influence of pH on foamability and stability applies to both pH-dependent and pH-responsive systems.
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Affiliation(s)
- Bernard P Binks
- Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, UK. b.p.binks@ hull.ac.uk
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89
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Lan Q, Yang F, Zhang S, Liu S, Xu J, Sun D. Synergistic effect of silica nanoparticle and cetyltrimethyl ammonium bromide on the stabilization of O/W emulsions. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2007.02.010] [Citation(s) in RCA: 162] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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90
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Yang F, Niu Q, Lan Q, Sun D. Effect of dispersion pH on the formation and stability of Pickering emulsions stabilized by layered double hydroxides particles. J Colloid Interface Sci 2007; 306:285-95. [PMID: 17113594 DOI: 10.1016/j.jcis.2006.10.062] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Revised: 10/12/2006] [Accepted: 10/15/2006] [Indexed: 11/24/2022]
Abstract
Using positively charged plate-like layered double hydroxides (LDHs) particles as emulsifier, liquid paraffin-in-water emulsions stabilized solely by such particles are successfully prepared. The effects of the pH of LDHs aqueous dispersions on the formation and stability of the emulsions are investigated here. The properties of the LDHs dispersions at different pHs are described, including particle zeta potential, particle aggregation, particle contact angle, flow behavior of the dispersions and particle adsorption at a planar oil/water interface. The zeta potential decreases with increasing pH, leading to the aggregation of LDHs particles into large flocs. The structural strength of LDHs dispersions is enhanced by increasing pH and particle concentration. The three-phase contact angle of LDHs also increases with increasing pH, but the variation is very small. Visual observation and SEM images of the interfacial particle layers show that the adsorption behavior of LDHs particles at the planar oil/water interface is controlled by dispersion pH. We consider that the particle-particle (at the interface) and particle-interface electrostatic interactions are well controlled by adjusting the dispersion pH, leading to pH-tailored colloid adsorption. The formation of an adsorbed particle layer around the oil drops is crucial for the formation and stability of the emulsions. Emulsion stability improves with increasing pH and particle concentration because more particles are available to be adsorbed at the oil/water interface. The structural strength of LDHs dispersions and the gel-like structure of emulsions also influence the stability of the emulsions, but they are not necessary for the formation of emulsions. The emulsions cannot be demulsified by adjusting emulsion pH due to the irreversible adsorption of LDHs particles at the oil/water interface. TEM images of the emulsion drops show that a thick particle layer forms around the oil drops, confirming that Pickering emulsions are stabilized by the adsorbed particle layers. The thick adsorbed particle layer may be composed of a stable inner particle layer which is in direct contact with the oil phase and a relatively unstable outer particle layer surrounding the inner layer.
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Affiliation(s)
- Fei Yang
- Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Shandong University, Jinan, Shandong 250100, People's Republic of China
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91
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Binks BP, Murakami R. Phase inversion of particle-stabilized materials from foams to dry water. NATURE MATERIALS 2006; 5:865-9. [PMID: 17041582 DOI: 10.1038/nmat1757] [Citation(s) in RCA: 232] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Accepted: 08/31/2006] [Indexed: 05/06/2023]
Abstract
Small particles attached to liquid surfaces arise in many products and processes, including crude-oil emulsions and food foams and in flotation, and there is a revival of interest in studying their behaviour. Colloidal particles of suitable wettability adsorb strongly to liquid-liquid and liquid-vapour interfaces, and can be sole stabilizers of emulsions and foams, respectively. New materials, including colloidosomes, anisotropic particles and porous solids, have been prepared by assembling particles at such interfaces. Phase inversion of particle-stabilized emulsions from oil in water to water in oil can be achieved either by variation of the particle hydrophobicity (transitional) or by variation of the oil/water ratio (catastrophic). Here we describe the phase inversion of particle-stabilized air-water systems, from air-in-water foams to water-in-air powders and vice versa. This inversion can be driven either by a progressive change in silica-particle hydrophobicity at constant air/water ratio or by changing the air/water ratio at fixed particle wettability, and has not been observed in the corresponding systems stabilized by surfactants. The simplicity of the work is that this novel inversion is achieved in a single system. The resultant materials in which either air or water become encapsulated have potential applications in the food, pharmaceutical and cosmetics industries.
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Affiliation(s)
- Bernard P Binks
- Surfactant & Colloid Group, Department of Chemistry, University of Hull, UK.
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