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Xing Y, Zhang L, Yu L, Song A, Hu J. pH-Responsive foams triggered by particles from amino acids with metal ions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Tyowua AT, Echendu AM, Adejo SO, Binks BP. Influence of particle wettability on foam formation in honey. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:454003. [PMID: 36055236 DOI: 10.1088/1361-648x/ac8f0b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
The rising level of obesity is often attributed to high sugar and/or fat consumption. Therefore, the food industry is constantly searching for ways to reduce or eliminate sugar or fat in food products. Therefore, honey foam, which contains little sugar and no fat, can be used as cake, cracker or bread spread instead of butter or margarine which contains a substantial amount of fat or jam that contains a substantial amount of sugar. Small solid particles (nanometers to micrometers) of suitable wettability are now considered outstanding foam-stabilizing agents. However, while the degree of particle wettability necessary to obtain very stable aqueous and nonaqueous foams is well-known, that needed to obtain very stable honey foam is unknown. In this study, the influence of the degree of wettability of fumed silica particles, indicated by their % SiOH (14-100), was investigated in honey in relation to foam formation and foam stability. The honephilic particles (61%-100% SiOH) formed particle dispersion in honey, while foams were obtained with the honephobic particles (14%-50% SiOH). The thread-off between particle dispersion and foam formation occurs at 50% SiOH, meaning foam formation in honey is possible when the particles are at least 50% honephobic. At relatively low particle concentration <1 wt.%, foam volume decreases with increasing honephobicity, but increases with honephobicity at relatively high concentration >1 wt.%. Also, as particle concentration increases, the shape of the air bubbles in the foam changes from spherical to non-spherical. After a little drainage, the foams remain stable to drainage and did not coalesce substantially for more than six months. These findings will guide the formulation of edible Pickering honey foams.
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Affiliation(s)
- Andrew T Tyowua
- Applied Colloid Science and Cosmeceutical Group, Centre for Food Technology & Research, Department of Chemistry, Benue State University, PMB 102119 Makurdi, Nigeria
| | - Adebukola M Echendu
- Applied Colloid Science and Cosmeceutical Group, Centre for Food Technology & Research, Department of Chemistry, Benue State University, PMB 102119 Makurdi, Nigeria
| | - Sylvester O Adejo
- Applied Colloid Science and Cosmeceutical Group, Centre for Food Technology & Research, Department of Chemistry, Benue State University, PMB 102119 Makurdi, Nigeria
| | - Bernard P Binks
- Department of Chemistry and Biochemistry, University of Hull, Hull HU6 7RX, United Kingdom
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Protein Nanoparticles Promote Microparticle Formation in Intravenous Immunoglobulin Solutions During Freeze-Thawing and Agitation Stresses. J Pharm Sci 2018; 107:1852-1857. [PMID: 29601840 DOI: 10.1016/j.xphs.2018.03.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 03/07/2018] [Accepted: 03/08/2018] [Indexed: 11/21/2022]
Abstract
In this study, we investigated the potential roles of nanoparticles (<100 nm) and submicron (100-1000 nm) particles in the formation of microparticles (>1000 nm) in protein formulations under some pharmaceutically relevant stress conditions. Exposure of intravenous immunoglobulin solutions to the interface-associated stresses of freeze-thawing or agitation resulted in relatively large increases in microparticle concentrations, which depended directly on the levels of pre-existing nano- and submicron particles. Thus, agglomeration of nanoparticles and submicron particles appears to play a role in microparticle formation under these stresses. In contrast, increases in microparticle concentrations during quiescent incubation at elevated temperatures were independent of the initial nano- and submicron particle concentrations in solution.
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Binks BP, Johnston SK, Sekine T, Tyowua AT. Particles at Oil-Air Surfaces: Powdered Oil, Liquid Oil Marbles, and Oil Foam. ACS APPLIED MATERIALS & INTERFACES 2015; 7:14328-14337. [PMID: 26107421 DOI: 10.1021/acsami.5b02890] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The type of material stabilized by four kinds of fluorinated particles (sericite and bentonite platelet clays and spherical zinc oxide) in air-oil mixtures has been investigated. It depends on the particle wettability and the degree of shear. Upon vigorous agitation, oil dispersions are formed in all the oils containing relatively large bentonite particles and in oils of relatively low surface tension (γla < 26 mN m(-1)) like dodecane, 20 cS silicone, and cyclomethicone containing the other fluorinated particles. Particle-stabilized oil foams were obtained in oils having γla > 26 mN m(-1) where the advancing air-oil-solid contact angle θ lies between ca. 90° and 120°. Gentle shaking, however, gives oil-in-air liquid marbles with all the oil-particle systems except for cases where θ is <60°. For oils of tension >24 mN m(-1) with omniphobic zinc oxide and sericite particles for which advancing θ ≥ 90°, dry oil powders consisting of oil drops in air which do not leak oil could be made upon gentle agitation up to a critical oil:particle ratio (COPR). Above the COPR, catastrophic phase inversion of the dry oil powders to air-in-oil foams was observed. When sheared on a substrate, the dry oil powders containing at least 60 wt % of oil release the encapsulated oil, making these materials attractive formulations in the cosmetic and food industries.
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Affiliation(s)
- Bernard P Binks
- †Surfactant and Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
| | - Shaun K Johnston
- †Surfactant and Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
| | - Tomoko Sekine
- ‡Shiseido Research Center, Shin-Yokohama, 2-2-1 Hayabuchi, Tsuzuki-Ku, Yokohama 224-8558, Japan
| | - Andrew T Tyowua
- †Surfactant and Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
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Binks BP, Sekine T, Tyowua AT. Dry oil powders and oil foams stabilised by fluorinated clay platelet particles. SOFT MATTER 2014; 10:578-589. [PMID: 24652119 DOI: 10.1039/c3sm52748d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A series of platelet sericite particles coated to different extents with a fluorinating agent has been characterised and their behaviour in mixtures with air and oil studied. The material which forms by vigorous shaking depends on both the surface tension of the oil and the surface energy of the particles which control their degree of wetting. Oil dispersions are formed in liquids of relatively low tension (<22 mN m(-1)), e.g. hexane and cyclomethicone, for all particles. Particle-stabilised air-in-oil foams form in liquids of higher tension, e.g. dodecane and phenyl silicone, where the advancing three-phase contact angle θ, measured on a planar substrate composed of the particles into the liquid, lies between ca. 65° and 120°. For oils of tension above 27 mN m(-1) like squalane and liquid paraffin with particles for which θ > 70°, we have discovered that dry oil powders in which oil drops stabilised by particles dispersed in air (oil-in-air) can be prepared by gentle mixing up to a critical oil : particle ratio (COPR) and do not leak oil. These powders, containing up to 80 wt% oil, release the encapsulated oil when sheared on a substrate. For many of the systems forming oil powders, stable liquid oil marbles can also be prepared. Above the COPR, catastrophic phase inversion occurs yielding an ultra-stable air-in-oil foam. We thus demonstrate the ability to disperse oil drops or air bubbles coated with particles within novel materials.
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Affiliation(s)
- Bernard P Binks
- Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull, HU6 7RX, UK.
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Heidlebaugh SJ, Domenech T, Iasella SV, Velankar SS. Aggregation and separation in ternary particle/oil/water systems with fully wettable particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:63-74. [PMID: 24345163 DOI: 10.1021/la4039396] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report that a variety of ternary particle/liquid/liquid mixtures heavily aggregate or separate completely if (1) the particles are fully or almost fully wetted by one fluid, and (2) if the wetting fluid volume fraction is comparable to the particle volume fraction. Aggregation and separation do not happen if the particles are partially wetted by both fluids, in which case Pickering emulsions appear at all compositions. Rheological and geometric criteria for aggregation are proposed and compared with a state diagram of a ternary system composed of oil, water, and hydrophilic glass particles. Analogies are drawn to wet granulation and spherical agglomeration, two particle processing operations in which wetting phenomena are important.
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Affiliation(s)
- Samantha J Heidlebaugh
- Department of Chemical and Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
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Ahn HS, Jang JW, Seol M, Kim JM, Yun DJ, Park C, Kim H, Youn DH, Kim JY, Park G, Park SC, Kim JM, Yu DI, Yong K, Kim MH, Lee JS. Self-assembled foam-like graphene networks formed through nucleate boiling. Sci Rep 2013; 3:1396. [PMID: 23466511 PMCID: PMC3590561 DOI: 10.1038/srep01396] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 02/11/2013] [Indexed: 11/16/2022] Open
Abstract
Self-assembled foam-like graphene (SFG) structures were formed using a simple nucleate boiling method, which is governed by the dynamics of bubble generation and departure in the graphene colloid solution. The conductivity and sheet resistance of the calcined (400°C) SFG film were 11.8 S·cm(-1) and 91.2 Ω□(-1), respectively, and were comparable to those of graphene obtained by chemical vapor deposition (CVD) (~10 S·cm(-1)). The SFG structures can be directly formed on any substrate, including transparent conductive oxide (TCO) glasses, metals, bare glasses, and flexible polymers. As a potential application, SFG formed on fluorine-doped tin oxide (FTO) exhibited a slightly better overall efficiency (3.6%) than a conventional gold electrode (3.4%) as a cathode of quantum dot sensitized solar cells (QDSSCs).
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Affiliation(s)
- Ho Seon Ahn
- Division of Mechanical System Engineering, Incheon National University, Incheon, 406-772, Republic of Korea
- These authors contributed equally to this work
| | - Ji-Wook Jang
- Department of Chemical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
- These authors contributed equally to this work
| | - Minsu Seol
- Department of Chemical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Ji Min Kim
- Department of Mechanical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Dong-Jin Yun
- Analytical Engineering Laboratory of Samsung Advanced Institute of Technology, PO Box 111, 440-600, Republic of Korea
| | - Chibeom Park
- Department of Chemistry, POSTECH, Pohang, 790-784, Republic of Korea
| | - Hyungdae Kim
- Department of Nuclear Engineering, Kyung Hee University, Youngin, 446-701, Republic of Korea
| | - Duck Hyun Youn
- Department of Chemical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Jae Young Kim
- Department of Chemical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Gunyeop Park
- Department of Mechanical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Su Cheong Park
- Department of Mechanical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Jin Man Kim
- Division of Advanced Nuclear Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Dong In Yu
- Department of Mechanical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Kijung Yong
- Department of Chemical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Moo Hwan Kim
- Department of Mechanical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
- Division of Advanced Nuclear Engineering, POSTECH, Pohang, 790-784, Republic of Korea
| | - Jae Sung Lee
- Department of Chemical Engineering, POSTECH, Pohang, 790-784, Republic of Korea
- Division of Advanced Nuclear Engineering, POSTECH, Pohang, 790-784, Republic of Korea
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Fletcher PDI, Holt BL. Controlled silanization of silica nanoparticles to stabilize foams, climbing films, and liquid marbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:12869-12876. [PMID: 21888342 DOI: 10.1021/la2028725] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe a method for the synthesis of multigram amounts of silica nanoparticles which are controllably hydrophobized to different extents using a room temperature vapor phase silanization process. The extent of hydrophobization of the particles can be adjusted by changing the amount of dichlorodimethylsilane reagent used in the reaction. The method produces particles with good uniformity of surface coating; the silane coating varies from monolayer coverage at low extents of hydrophobization to approximately trilayer at high extents of hydrophobization. Acid-base titration using conductivity detection was used to characterize the extent of hydrophobization which is expressed as the percent of surface silanol groups remaining after silanization. Particles with %SiOH ranging from 100% (most hydrophilic) to 20% (most hydrophobic) were hand shaken with water/methanol mixtures and produced either a particle dispersion, foam, climbing films, or liquid marbles. The type of colloidal structure produced is discussed in terms of the liquid-air-particle contact angle and the energy of adsorption of the particles to the liquid-air surface.
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Affiliation(s)
- Paul D I Fletcher
- Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX United Kingdom.
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Shen X, Ye L. Molecular imprinting in Pickering emulsions: a new insight into molecular recognition in water. Chem Commun (Camb) 2011; 47:10359-61. [DOI: 10.1039/c1cc13899e] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
The method employed for depositing nanostructures of conducting polymers dictates potential uses in a variety of applications such as organic solar cells, light-emitting diodes, electrochromics, and sensors. A simple and scalable film fabrication technique that allows reproducible control of thickness, and morphological homogeneity at the nanoscale, is an attractive option for industrial applications. Here we demonstrate that under the proper conditions of volume, doping, and polymer concentration, films consisting of monolayers of conducting polymer nanofibers such as polyaniline, polythiophene, and poly(3-hexylthiophene) can be produced in a matter of seconds. A thermodynamically driven solution-based process leads to the growth of transparent thin films of interfacially adsorbed nanofibers. High quality transparent thin films are deposited at ambient conditions on virtually any substrate. This inexpensive process uses solutions that are recyclable and affords a new technique in the field of conducting polymers for coating large substrate areas.
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