1
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Pickering foams and parameters influencing their characteristics. Adv Colloid Interface Sci 2022; 301:102606. [PMID: 35182930 DOI: 10.1016/j.cis.2022.102606] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/20/2022] [Accepted: 01/26/2022] [Indexed: 11/21/2022]
Abstract
Pickering foams are available in many applications and have been continually gaining interest in the last two decades. Pickering foams are multifaceted, and their characteristics are highly dependent on many factors, such as particle size, charge, hydrophobicity and concentration as well as the charge and concentration of surfactants and salts available in the system. A literature review of these individual studies at first might seem confusing and somewhat contradictory, particularly in multi-component systems with particles and surfactants with different charges in the presence of salts. This paper provides a comprehensive overview of particle-stabilized foams, also known as Pickering foams and froths. Underlying mechanisms of foam stabilization by particles with different morphology, surface chemistry, size and type are reviewed and clarified. This paper also outlines the role of salts and different factors such as pH, temperature and gas type on Pickering foams. Further, we highlight recent developments in Pickering foams in different applications such as food, mining, oil and gas, and wastewater treatment industries, where Pickering foams are abundant. We conclude this overview by presenting important research avenues based on the gaps identified here. The focus of this review is limited to Pickering foams of surfactants with added salts and does not include studies on polymers, proteins, or other macromolecules.
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2
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Davies T, Raufaste C. Effect of gravity on the orientation and detachment of cubic particles adsorbed at soap film or liquid interfaces. SOFT MATTER 2021; 17:6964-6971. [PMID: 34251006 DOI: 10.1039/d1sm00793a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We investigate the interaction that occurs between a light solid cube falling under gravity and a horizontal soap film that is pinned to a circular ring. We observe in both experiments and quasi-static simulations that the final orientation of a cube that becomes entrapped by a soap film is strongly dependent on the Bond number. A cube is rotated by a soap film into one of three main orientations in a process that is driven by energy minimisation. The likelihood of observing each of these final orientations is shown to depend on the Bond number, and the most energetically favourable orientation depends on the terminal height reached by the cube. We also find a critical value for the Bond number, above which a cube is no longer supported by a soap film and detachment occurs, to be less than one.
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Affiliation(s)
- Tudur Davies
- Department of Mathematics, Aberystwyth University, Aberystwyth, Ceredigion SY23 3BZ, UK.
| | - Christophe Raufaste
- Université Côte d'Azur, CNRS UMR 7010, Institut de Physique de Nice, Parc Valrose, 06100 Nice, France and Institut Universitaire de France (IUF), 75005 Paris, France
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3
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Kim JY, Barcus K, Cohen SM. Controlled Two-Dimensional Alignment of Metal-Organic Frameworks in Polymer Films. J Am Chem Soc 2021; 143:3703-3706. [PMID: 33683860 DOI: 10.1021/jacs.0c13459] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Controlling the alignment of metal-organic framework (MOF) particles is valueable for fully exploiting the anisotropic properties and porous structure of these materials. Herein, we propose a simple, one-step method that can control the two-dimensional (2D) alignment of MOF particles over large areas. Orientational control is achieved without consideration of the underlying lattice parameters or the need for particle surface modification, but instead was achieved by selection of the casting solvent on a water surface. Two distinct types of MOF particles, a hexagonal bifrustum morphology of MIL-96 and an octahedral morphology of the UiO-66 family were aligned and captured in a polydimethylsiloxane (PDMS) matrix using this approach. This work provides opportunities for studying and utilizing the anisotropic properties of MOFs in thin film applications.
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Affiliation(s)
- Jin Yeong Kim
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Kyle Barcus
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Seth M Cohen
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
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4
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Filby BW, Hardman MJ, Paunov VN. Antibody‐free bioimprint aided sandwich ELISA technique for cell recognition and rapid screening for bacteria. NANO SELECT 2020. [DOI: 10.1002/nano.202000113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Benjamin W. Filby
- Department of Chemistry and Biochemistry University of Hull Hull HU6 7RX UK
| | - Matthew J. Hardman
- Department of Chemistry and Biochemistry University of Hull Hull HU6 7RX UK
| | - Vesselin N. Paunov
- Department of Chemistry and Biochemistry University of Hull Hull HU6 7RX UK
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5
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Pelle M, Das AAK, Madden LA, Paunov VN. Bioimprint Mediated Label-Free Isolation of Pancreatic Tumor Cells from a Healthy Peripheral Blood Cell Population. ADVANCED BIOSYSTEMS 2020; 4:e2000054. [PMID: 33016004 DOI: 10.1002/adbi.202000054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 09/22/2020] [Indexed: 11/11/2022]
Abstract
New techniques are required for earlier diagnosis and response to treatment of pancreatic cancer. Here, a label-free approach is reported in which circulating pancreatic tumor cells are isolated from healthy peripheral blood cells via cell bioimprinting technology. The method involves pre-fabrication of pancreatic cell layers and sequential casting of cell surfaces with a series of custom-made resins to produce negative cell imprints. The imprint is functionalized with a combination of polymers to engineer weak attraction to the cells which is further amplified by the increased area of contact with the matching cells. A flow-through bioimprint chip is designed and tested for selectivity toward two pancreatic tumor cell lines, ASPC-1 and Mia-PaCa-2. Healthy human peripheral blood mononuclear cells (PBMCs) are spiked with pancreatic tumor cells at various concentrations. Bioimprints are designed for preferential retention of the matching pancreatic tumor cells and with respect to PBMCs. Tumor bioimprints are capable of capturing and concentrating pancreatic tumor cells from a mixed cell population with increased retention observed with the number of seedings. ASPC-1 bioimprints preferentially retain both types of pancreatic tumor cells. This technology could be relevant for the collection and interrogation of liquid biopsies, early detection, and relapse monitoring of pancreatic cancer patients.
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Affiliation(s)
- Marie Pelle
- Department of Chemistry and Biochemistry, University of Hull, Hull, HU6 7RX, UK
| | - Anupam A K Das
- Department of Chemistry and Biochemistry, University of Hull, Hull, HU6 7RX, UK
| | - Leigh A Madden
- Department of Biomedical Sciences, University of Hull, Hull, HU6 7RX, UK
| | - Vesselin N Paunov
- Department of Chemistry and Biochemistry, University of Hull, Hull, HU6 7RX, UK
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6
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Kondej D, Sosnowski TR. Interfacial rheology for the assessment of potential health effects of inhaled carbon nanomaterials at variable breathing conditions. Sci Rep 2020; 10:14044. [PMID: 32820205 PMCID: PMC7441146 DOI: 10.1038/s41598-020-70909-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 07/27/2020] [Indexed: 01/01/2023] Open
Abstract
Lung surface is the first line of contact between inhaled carbon nanomaterials, CNMs, and the organism, so this is the place where pulmonary health effects begin. The paper analyzes the influence of several CNMs (single- and multi-walled nanotubes with various surface area: 90-1,280 m2/g and aspect ratio: 8-3,750) on the surface-active properties of the lung surfactant, LS, model (Survanta). Effects of CNM concentration (0.1-1 mg/ml) and surface oscillation rate were determined using the oscillating drop method at simulated breathing conditions (2-10 s per cycle, 37 °C). Based on the values of apparent elasticity and viscosity of the interfacial region, new parameters: Sε and Sμ were proposed to evaluate potential effect of particles on the LS at various breathing rates. Some of tested CNMs (e.g., COOH- functionalized short nanotubes) significantly influenced the surfactant dynamics, while the other had weaker effects even at high particle concentration. Analysis of changes in Sε and Sμ provides a new way to evaluate of a possible disturbance of the basic functions of LS. The results show that the expected pulmonary effects caused by inhaled CNMs at variable breathing rate depend not only on particle concentration (inhaled dose) but also on their size, structure and surface properties.
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Affiliation(s)
- Dorota Kondej
- Central Institute for Labour Protection - National Research Institute, Czerniakowska 16, 00-701, Warsaw, Poland
| | - Tomasz R Sosnowski
- Faculty of Chemical and Process Engineering, Warsaw University of Technology, Waryńskiego 1, 00-645, Warsaw, Poland.
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7
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Chester R, Das AAK, Medlock J, Nees D, Allsup DJ, Madden LA, Paunov VN. Removal of Human Leukemic Cells from Peripheral Blood Mononuclear Cells by Cell Recognition Chromatography with Size Matched Particle Imprints. ACS APPLIED BIO MATERIALS 2020; 3:789-800. [DOI: 10.1021/acsabm.9b00770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rosie Chester
- Department of Chemistry and Biochemistry, University of Hull, Cottingham Road, Hull, HU67RX, U.K
| | - Anupam A. K. Das
- Department of Chemistry and Biochemistry, University of Hull, Cottingham Road, Hull, HU67RX, U.K
| | - Jevan Medlock
- Department of Chemistry and Biochemistry, University of Hull, Cottingham Road, Hull, HU67RX, U.K
| | - Dieter Nees
- Joanneum Research FmbH, Leonhardstrasse 59, 8010 Graz, Austria
| | - David J. Allsup
- Hull York Medical School, University of Hull, Cottingham Road, Hull, HU67RX, U.K
| | - Leigh A. Madden
- Department of Biomedical Sciences, University of Hull, Cottingham Road, Hull, HU67RX, U.K
| | - Vesselin N. Paunov
- Department of Chemistry and Biochemistry, University of Hull, Cottingham Road, Hull, HU67RX, U.K
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8
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Du Z, Li Q, Li J, Su E, Liu X, Wan Z, Yang X. Self-Assembled Egg Yolk Peptide Micellar Nanoparticles as a Versatile Emulsifier for Food-Grade Oil-in-Water Pickering Nanoemulsions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:11728-11740. [PMID: 31525998 DOI: 10.1021/acs.jafc.9b04595] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Pickering emulsions stabilized by food-grade particles have garnered increasing interest in recent years due to their promising applications in biorelated fields such as foods, cosmetics, and drug delivery. However, it remains a big challenge to formulate nanoscale Pickering emulsions from these edible particles. Herein we show that a new Pickering nanoemulsion that is stable, monodisperse, and controllable can be produced by employing the spherical micellar nanoparticles (EYPNs), self-assembled from the food-derived, amphiphilic egg yolk peptides, as an edible particulate emulsifier. As natural peptide-based nanoparticles, the EYPNs have a small particle size, intermediate wettability, high surface activity, and deformability at the interface, which enable the formation of stable Pickering nanodroplets with a mean dynamic light scattering diameter below 200 nm and a polydispersity index below 0.2. This nanoparticle system is versatile for different oil phases with various polarities and demonstrates the easy control of nanodroplet size through tuning the microfluidization conditions or the ratio of EYPNs to oil phase. These food-grade Pickering nanoemulsions, obtained when the internal phase is an edible vegetable oil, have superior stability during long-term storage and spray-drying based on the irreversible and compact adsorption of intact EYPNs at the nanodroplet surface. This is the first finding of a natural edible nano-Pickering emulsifier that can be used solely to make stable food Pickering nanoemulsions with the qualities of simplicity, versatility, low cost, and the possibility of controllable and mass production, which make them viable for many sustainable applications.
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Affiliation(s)
- Zhenya Du
- Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , People's Republic of China
| | - Qing Li
- Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , People's Republic of China
| | - Junguang Li
- Henan Key Laboratory of Cold Chain Food Quality and Safety Control , Zhengzhou University of Light Industry , Zhengzhou 450002 , People's Republic of China
| | - Enyi Su
- Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , People's Republic of China
| | - Xiao Liu
- Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , People's Republic of China
- Laboratory of Physics and Physical Chemistry of Foods , Wageningen University , Bornse Weilanden 9 , 6708WG Wageningen , The Netherlands
| | - Zhili Wan
- Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , People's Republic of China
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center) , Guangzhou 510640 , People's Republic of China
| | - Xiaoquan Yang
- Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , People's Republic of China
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9
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Li T, Lilja K, Morris RJ, Brandani GB. Langmuir–Blodgett technique for anisotropic colloids: Young investigator perspective. J Colloid Interface Sci 2019; 540:420-438. [DOI: 10.1016/j.jcis.2019.01.044] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 01/10/2019] [Accepted: 01/11/2019] [Indexed: 10/27/2022]
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10
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Ballard N, Law AD, Bon SAF. Colloidal particles at fluid interfaces: behaviour of isolated particles. SOFT MATTER 2019; 15:1186-1199. [PMID: 30601564 DOI: 10.1039/c8sm02048e] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The adsorption of colloidal particles to fluid interfaces is a phenomenon that is of interest to multiple disciplines across the physical and biological sciences. In this review we provide an entry level discussion of our current understanding on the physical principles involved and experimental observations of the adsorption of a single isolated particle to a liquid-liquid interface. We explore the effects that a variation of the morphology and surface chemistry of a particle can have on its ability to adhere to a liquid interface, from a thermodynamic as well as a kinetic perspective, and the impact of adsorption behaviour on potential applications. Finally, we discuss recent developments in the measurement of the interfacial behaviour of nanoparticles and highlight open questions for future research.
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Affiliation(s)
- Nicholas Ballard
- POLYMAT - University of the Basque Country (UPV/EHU), Centro Joxe Mari Korta, Avenida de Tolosa 72, 20018, Donostia-San Sebastian, Spain.
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11
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Anjali TG, Basavaraj MG. Shape-Anisotropic Colloids at Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3-20. [PMID: 29986588 DOI: 10.1021/acs.langmuir.8b01139] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Research in the 1980s demonstrated the formation of monolayers of particles achieved by interfacial particle trapping as a model system for investigating colloids in two dimensions. Since then, microscopy visualization of two-dimensional particle monolayers and quantification of the microstructure have led to significant fundamental understanding of a number of phenomena such as crystallization, freezing and melting transitions, dislocation dynamics, aggregation kinetics, and others. On the application front, particles at curved interfaces, as often the case in particle-stabilized emulsions and foams, have received considerable attention in the last few decades. The growing interest in the search for novel particles and new strategies to effect emulsion stabilization stems from their application in several disciplines. Moreover, particle-stabilized Pickering emulsions and foams can also be used to derive a number of advanced functional materials. Compared to several accounts of research on spherical colloids at fluid-fluid interfaces, investigations of the behavior of shape-anisotropic particles at interfaces, albeit receiving considerable attention in recent years, are still in a nascent stage. The objective of this feature article is to highlight our recent work in this area. In particular, the adsorption of shape-anisotropic particles to interfaces, wetting behavior, interfacial self-assembly, the response of nonspherical-particle-coated interfaces to compression and shear, and their ability to stabilize emulsions are discussed.
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Affiliation(s)
- Thriveni G Anjali
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600 036 , India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600 036 , India
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12
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Maestro A, Santini E, Guzmán E. Physico-chemical foundations of particle-laden fluid interfaces. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2018; 41:97. [PMID: 30141087 DOI: 10.1140/epje/i2018-11708-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 07/27/2018] [Indexed: 06/08/2023]
Abstract
Particle-laden interfaces are ubiquitous nowadays. The understanding of their properties and structure is essential for solving different problems of technological and industrial relevance; e.g. stabilization of foams, emulsions and thin films. These rely on the response of the interface to mechanical perturbations. The complex mechanical response appearing in particle-laden interfaces requires deepening on the understanding of physico-chemical mechanisms underlying the assembly of particles at interface which plays a central role in the distribution of particles at the interface, and in the complex interfacial dynamics appearing in these systems. Therefore, the study of particle-laden interfaces deserves attention to provide a comprehensive explanation on the complex relaxation mechanisms involved in the stabilization of fluid interfaces.
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Affiliation(s)
- Armando Maestro
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble, Cedex 9, France
| | - Eva Santini
- Istituto di Chimica della Materia Condensata e di Tecnologia per l'Energia (ICMATE), U.O.S. Genova-Consiglio Nazionale delle Ricerche (CNR), Via De Marini 6, 16149, Genova, Italy
| | - Eduardo Guzmán
- Departamento de Química Física I, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan XXIII, 1, 28040, Madrid, Spain.
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13
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Dunstan TS, Das AAK, Starck P, Stoyanov SD, Paunov VN. Capillary Structured Suspensions from In Situ Hydrophobized Calcium Carbonate Particles Suspended in a Polar Liquid Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:442-452. [PMID: 29239178 DOI: 10.1021/acs.langmuir.7b03589] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We demonstrate that capillary suspensions can be formed from hydrophilic calcium carbonate particles suspended in a polar continuous media and connected by capillary bridges formed of minute amounts of an immiscible secondary liquid phase. This was achieved in two different polar continuous phases, water and glycerol, and three different oils, oleic acid, isopropyl myristate, and peppermint oil as a secondary liquid phase. The capillary structuring of the suspension was made possible through local in situ hydrophobization of the calcium carbonate particles dispersed in the polar media by adding very small amounts of oleic acid to the secondary liquid phase. We observed a strong increase in the viscosity of the calcium carbonate suspension by several orders of magnitude upon addition of the secondary oil phase compared with the same suspension without secondary liquid phase or without oleic acid. The stability and the rheological properties of the obtained capillary structured materials were studied in relation to the physical properties of the system such as the particle size, interfacial tension between the primary and secondary liquid phases, as well as the particle contact angle at this liquid-liquid interface. We also determined the minimal concentrations of the secondary liquid phase at fixed particle concentration as well as the minimal particle concentration at fixed secondary phase concentration needed to form a capillary suspension. Capillary suspensions formed by this method can find application in structuring pharmaceutical and food formulations as well as a variety of home and personal care products.
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Affiliation(s)
- Timothy S Dunstan
- School of Mathematics and Physical Sciences (Chemistry), University of Hull , Hull HU6 7RX, United Kingdom
| | - Anupam A K Das
- School of Mathematics and Physical Sciences (Chemistry), University of Hull , Hull HU6 7RX, United Kingdom
| | - Pierre Starck
- Unilever R&D Port Sunlight , Quarry Road East, Bebington, CH63 3JW, United Kingdom
| | - Simeon D Stoyanov
- Unilever R&D Vlaardingen , Olivier van Noortlaan 120, 3133 AT Vlaardingen, The Netherlands
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University , 6703 HB Wageningen, The Netherlands
- Department of Mechanical Engineering, University College London , Torrington Place, London WC1E 7JE, United Kingdom
| | - Vesselin N Paunov
- School of Mathematics and Physical Sciences (Chemistry), University of Hull , Hull HU6 7RX, United Kingdom
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14
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Anjali TG, Basavaraj MG. Contact angle and detachment energy of shape anisotropic particles at fluid-fluid interfaces. J Colloid Interface Sci 2016; 478:63-71. [DOI: 10.1016/j.jcis.2016.05.060] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 05/28/2016] [Indexed: 11/16/2022]
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15
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Zanini M, Isa L. Particle contact angles at fluid interfaces: pushing the boundary beyond hard uniform spherical colloids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:313002. [PMID: 27299800 DOI: 10.1088/0953-8984/28/31/313002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Micro and nanoparticles at fluid interfaces have been attracting increasing interest in the last few decades as building blocks for materials, as mechanical and structural probes for complex interfaces and as models for two-dimensional systems. The three-phase contact angle enters practically all aspects of the particle behavior at the interface: its thermodynamics (binding energy to the interface), dynamics (motion and drag at the interface) and interactions with the interface (adsorption and wetting). Moreover, many interactions among particles at the interface also strongly depend on the contact angle. These concepts have been extensively discussed for non-deformable, homogeneous and mostly spherical particles, but recent progress in particle synthesis and fabrication has instead moved in the direction of producing more complex micro and nanoscale objects, which can be responsive, deformable, heterogenous and/or anisotropic in shape, surface chemistry and material properties. These new particles have a much greater potential for applications and new science, and the study of their behavior at interfaces has only very recently started. In this paper, we critically review the current state of the art of the experimental methods available to measure the contact angle of micro and nanoparticles at fluid interfaces, indicating their strengths and limitations. We then comment on new particle systems that are currently attracting increasing interest in relation to their adsorption and assembly at fluid interfaces and discuss if and which ones of the current techniques are suited to investigate their properties at interfaces. Based on this discussion, we will finally try to indicate a direction in which new experimental methods should develop in the future to tackle the new challenges posed by the novel types of particles that more and more often are used at interfaces.
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Affiliation(s)
- Michele Zanini
- Department of Materials, Laboratory for Interfaces, Soft matter and Assembly, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
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16
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Soligno G, Dijkstra M, van Roij R. Self-Assembly of Cubes into 2D Hexagonal and Honeycomb Lattices by Hexapolar Capillary Interactions. PHYSICAL REVIEW LETTERS 2016; 116:258001. [PMID: 27391753 DOI: 10.1103/physrevlett.116.258001] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 05/20/2023]
Abstract
Particles adsorbed at a fluid-fluid interface induce capillary deformations that determine their orientations and generate mutual capillary interactions which drive them to assemble into 2D ordered structures. We numerically calculate, by energy minimization, the capillary deformations induced by adsorbed cubes for various Young's contact angles. First, we show that capillarity is crucial not only for quantitative, but also for qualitative predictions of equilibrium configurations of a single cube. For a Young's contact angle close to 90°, we show that a single-adsorbed cube generates a hexapolar interface deformation with three rises and three depressions. Thanks to the threefold symmetry of this hexapole, strongly directional capillary interactions drive the cubes to self-assemble into hexagonal or graphenelike honeycomb lattices. By a simple free-energy model, we predict a density-temperature phase diagram in which both the honeycomb and hexagonal lattice phases are present as stable states.
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Affiliation(s)
- Giuseppe Soligno
- Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, Utrecht 3584 CC, The Netherlands
| | - Marjolein Dijkstra
- Soft Condensed Matter, Debye Institute for Nanomaterials Science, Department of Physics and Astronomy, Utrecht University, Princetonplein 5, Utrecht 3584 CC, The Netherlands
| | - René van Roij
- Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, Utrecht 3584 CC, The Netherlands
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17
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Petit P, Biance AL, Lorenceau E, Planchette C. Bending modulus of bidisperse particle rafts: Local and collective contributions. Phys Rev E 2016; 93:042802. [PMID: 27176369 DOI: 10.1103/physreve.93.042802] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Indexed: 06/05/2023]
Abstract
The bending modulus of air-water interfaces covered by a monolayer of bidisperse particles is probed experimentally under quasistatic conditions via the compression of the monolayer, and under dynamical conditions studying capillary-wave propagation. Simple averaging of the modulus obtained solely with small or large particles fails to describe our data. Indeed, as observed in other configurations for monodisperse systems, bidisperse rafts have both a granular and an elastic character: chain forces and collective effects must be taken into account to fully understand our results.
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Affiliation(s)
- Pauline Petit
- Institut Lumière Matière, Université de Lyon, UMR 5306 Université Lyon 1-CNRS, 69622 Villeurbanne, France
| | - Anne-Laure Biance
- Institut Lumière Matière, Université de Lyon, UMR 5306 Université Lyon 1-CNRS, 69622 Villeurbanne, France
| | - Elise Lorenceau
- Laboratoire Navier, Université Paris-Est, UMR 8205 CNRS, Ecole des Ponts ParisTech, IFSTTAR, 77420 Champs sur Marne, France
| | - Carole Planchette
- Institute of Fluid Mechanics and Heat Transfer, Graz University of Technology, Austria and Research Center Pharmaceutical Engineering GmbH, Graz, Austria
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18
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Liang H, Zhou B, Li J, He Y, Pei Y, Li B. Engineering functional alginate beads for encapsulation of Pickering emulsions stabilized by colloidal particles. RSC Adv 2016. [DOI: 10.1039/c6ra21755a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Pickering emulsions are widely used as delivery systems in food, cosmetics, and pharmaceutical industries for the encapsulation and sustained release of hydrophilic compounds.
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Affiliation(s)
- Hongshan Liang
- College of Food Science and Technology
- Huazhong Agricultural University
- Wuhan 430070
- China
- Key Laboratory of Environment Correlative Dietology
| | - Bin Zhou
- College of Food Science and Technology
- Shanghai Ocean University
- LinGang New City
- China
| | - Jing Li
- College of Food Science and Technology
- Huazhong Agricultural University
- Wuhan 430070
- China
- Key Laboratory of Environment Correlative Dietology
| | - Yun He
- College of Food Science and Technology
- Huazhong Agricultural University
- Wuhan 430070
- China
- Key Laboratory of Environment Correlative Dietology
| | - Yaqiong Pei
- College of Food Science and Technology
- Huazhong Agricultural University
- Wuhan 430070
- China
- Key Laboratory of Environment Correlative Dietology
| | - Bin Li
- College of Food Science and Technology
- Huazhong Agricultural University
- Wuhan 430070
- China
- Hubei Collaborative Innovation Centre for Industrial Fermentation
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Paunov VN, Al-Shehri H, Horozov TS. Attachment of composite porous supra-particles to air–water and oil–water interfaces: theory and experiment. Phys Chem Chem Phys 2016; 18:26495-26508. [DOI: 10.1039/c6cp05453f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We developed and tested a theoretical model connecting the wettabilities of fluid-infused porous supra-particles and their smaller particle building blocks at a fluid–liquid interface.
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20
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Parakhonskiy B, Zyuzin MV, Yashchenok A, Carregal-Romero S, Rejman J, Möhwald H, Parak WJ, Skirtach AG. The influence of the size and aspect ratio of anisotropic, porous CaCO3 particles on their uptake by cells. J Nanobiotechnology 2015; 13:53. [PMID: 26337452 PMCID: PMC4558630 DOI: 10.1186/s12951-015-0111-7] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 07/28/2015] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Recent reports highlighting the role of particle geometry have suggested that anisotropy can affect the rate and the pathway of particle uptake by cells. Therefore, we investigate the internalization by cells of porous calcium carbonate particles with different shapes and anisotropies. RESULTS We report here on a new method of the synthesis of polyelectrolyte coated calcium carbonate particles whose geometry was controlled by varying the mixing speed and time, pH value of the reaction solution, and ratio of the interacting salts used for particle formation. Uptake of spherical, cuboidal, ellipsoidal (with two different sizes) polyelectrolyte coated calcium carbonate particles was studied in cervical carcinoma cells. Quantitative data were obtained from the analysis of confocal laser scanning microscopy images. CONCLUSIONS Our results indicate that the number of internalized calcium carbonate particles depends on the aspect ratio of the particle, whereby elongated particles (higher aspect ratio) are internalized with a higher frequency than more spherical particles (lower aspect ratio). The total volume of internalized particles scales with the volume of the individual particles, in case equal amount of particles were added per cell.
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Affiliation(s)
- Bogdan Parakhonskiy
- Shubnikov Institute of Crystallography, Russian Academy of Science, Moscow, Russia.
- Institute of Nanostructures and Biosystems, Saratov State University, Saratov, Russia.
| | - Mikhail V Zyuzin
- Fachbereich Physik, Philipps University of Marburg, Marburg, Germany.
| | - Alexey Yashchenok
- Institute of Nanostructures and Biosystems, Saratov State University, Saratov, Russia.
- Department of Interfaces, Max-Planck Institute of Colloids and Interfaces, Potsdam, Germany.
| | | | - Joanna Rejman
- Fachbereich Physik, Philipps University of Marburg, Marburg, Germany.
| | - Helmuth Möhwald
- Department of Interfaces, Max-Planck Institute of Colloids and Interfaces, Potsdam, Germany.
| | - Wolfgang J Parak
- Fachbereich Physik, Philipps University of Marburg, Marburg, Germany.
| | - Andre G Skirtach
- Department of Interfaces, Max-Planck Institute of Colloids and Interfaces, Potsdam, Germany.
- NanoBio-Photonics, Ghent University, Ghent, Belgium.
- Department of Molecular Biotechnology, Ghent University, Ghent, Belgium.
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Ballard N, Bon SA. Equilibrium orientations of non-spherical and chemically anisotropic particles at liquid–liquid interfaces and the effect on emulsion stability. J Colloid Interface Sci 2015; 448:533-44. [DOI: 10.1016/j.jcis.2015.02.069] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 02/26/2015] [Accepted: 02/26/2015] [Indexed: 11/15/2022]
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Rutkevičius M, Mehl GH, Petkov JT, Stoyanov SD, Paunov VN. Fabrication of salt–hydrogel marbles and hollow-shell microcapsules by an aerosol gelation technique. J Mater Chem B 2015; 3:82-89. [DOI: 10.1039/c4tb01443j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We discovered a way to make hydrogel marbles with hydrophilic particles by rolling gelled aerosol droplets in a bed of salt microcrystals which after sieving and drying of the hydrogel cores yielded hollow-shell salt microcapsules.
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Affiliation(s)
| | - Georg H. Mehl
- Department of Chemistry
- University of Hull
- Hull HU6 7RX
- UK
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Lam S, Velikov KP, Velev OD. Pickering stabilization of foams and emulsions with particles of biological origin. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.07.003] [Citation(s) in RCA: 338] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Al-Shehri H, Horozov TS, Paunov VN. Adsorption of carboxylic modified latex particles at liquid interfaces studied by the gel trapping technique. SOFT MATTER 2014; 10:6433-41. [PMID: 25051271 DOI: 10.1039/c4sm01030b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We have studied how carboxylic modified latex (CML) microparticles adsorb at liquid surfaces and the preferred type of emulsion they can stabilise depending on the particle size and the surface density of carboxylic groups. We measured the particle contact angle by using the gel trapping technique (GTT) for CML particles adsorbed at air-water and oil-water interfaces. Using this method we obtained scanning electron microscopy (SEM) micrographs of polydimethylsiloxane (PDMS) replicas of the liquid interface with the particles, where the PDMS replicates the non-polar phase and measured the particle contact angle. We discovered that the particle wettability correlates well with the surface density of the carboxylic groups but is not very sensitive to the presence of electrolyte in the aqueous phase and the value of the particle zeta potential. We demonstrated that CML microparticles with a high surface density of COOH groups stabilise oil-in-water (O/W) emulsions while those with the lowest coverage of COOH groups favour the formation of water-in-oil (W/O) emulsions. We found that this corresponds to a change of the CML particle contact angle from lower than 90° to higher than 90° upon decrease of the surface density of COOH groups. The findings confirm that the surface density of polar groups has a much bigger effect on the particle wettability and the preferred emulsion than the particle surface charge and zeta potential. Our results on the type of stabilised Pickering emulsion agree with other experimental studies with different particle materials. We propose an alternative explanation for the link between the particle contact angle and the type of stabilised Pickering emulsion.
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