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Carrera C, Bengoechea C, Carrillo F, Calero N. Effect of deacetylation degree and molecular weight on surface properties of chitosan obtained from biowastes. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.108383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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2
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Dynamics of adsorption of CTAB-Silica nanoparticle complexes: New experiments and modeling approach. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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3
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Amani P, Miller R, Ata S, Hurter S, Rudolph V, Firouzi M. Dynamics of interfacial layers for sodium dodecylbenzene sulfonate solutions at different salinities. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.09.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Nuorivaara T, Serna-Guerrero R. Amphiphilic cellulose and surfactant mixtures as green frothers in mineral flotation. 1. Characterization of interfacial and foam stabilization properties. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125297] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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5
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Biviano MD, Böni LJ, Berry JD, Fischer P, Dagastine RR. Interfacial Properties of Chitosan in Interfacial Shear and Capsule Compression. ACS APPLIED MATERIALS & INTERFACES 2020; 12:48084-48092. [PMID: 32921046 DOI: 10.1021/acsami.0c11781] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The time-dependent behavior of surface-active adsorption layers at the oil/water interface can dictate emulsion behavior at both the micro- and macroscale. In addition, self-healing behavior of the adsorption layer may benefit emulsion stability subject to large deformation under processing or during final application. We explore the behavior of chitosan, a known hydrophilic emulsifier, which forms nanoparticle aggregates when the concentration of acetate buffer exceeds 0.3 M. We observe a Pickering adsorption layer building and strain-dependent behavior of the chitosan at the medium chain triglyceride oil/water interface. We compare this to the behavior of identical chitosan layers coated on oil droplets via atomic force microscopy colloidal probe compression in both linear and oscillatory compressions. In both interfacial shear rheometry and the capsule compression, a thick, elastic layer with strong time-dependent recovery behavior is observed, suggesting that the layer has some self-healing capabilities.
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Affiliation(s)
- Matthew D Biviano
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Lukas J Böni
- Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, 8092 Zurich, Switzerland
| | - Joseph D Berry
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Peter Fischer
- Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, 8092 Zurich, Switzerland
| | - Raymond R Dagastine
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
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6
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Trégouët C, Salez T, Pantoustier N, Perrin P, Reyssat M, Monteux C. Probing the adsorption/desorption of amphiphilic polymers at the air-water interface during large interfacial deformations. SOFT MATTER 2019; 15:6200-6206. [PMID: 31328760 DOI: 10.1039/c9sm00368a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Hydrophobically modified polymers are good candidates for the stabilization of liquid interfaces thanks to the high anchoring energy of the hydrophobic parts. In this article we probe the interfacial anchoring of a series of home-made hydrophobically modified polymers with controlled degree of grafting by studying their behavior upon large area dilations and compressions. By comparing the measured interfacial tension to the one that we expect in the case of a constant number of adsorbed monomers, we are able to deduce whether desorption or adsorption occurs during area variations. We find that the polymer chains with the longest hydrophobic grafts desorb at larger compressions compared to the polymers with the shortest grafts, because of their larger desorption energy. Furthermore, for a given graft length, we observe more desorption for polymers with the highest grafting densities. We attribute this counter intuitive result to the fact that at high grafting densities, the length of the polymer loops is shorter, and hence the elastic penalty upon compression is larger for these layers, leading to a faster desorption. Comparing the elastic penalty to thermal energy, kBT, enables deducing a critical grafting density above which desorption of grafts is expected upon compression, which is consistent with our experimental results. In the case of large area dilations, the experiments reveal that the number of adsorbed anchors remains constant in the case of chains with a low grafting density while chains with the highest degree of grafting seem to show some degree of adsorption during the dilatation. Therefore, in these highly grafted chains there may be unadsorbed grafts remaining in the vicinity of the interface, which may adsorb quickly at the interface upon dilatation.
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Affiliation(s)
- C Trégouët
- Laboratoire Sciences et Ingénierie de la Matière Molle, PSL Research University, Sorbonne University, ESPCI Paris, UMR 7615 CNRS, 10 rue Vauquelin, 75231 Paris cedex 05, France and UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University, 75005 Paris, France
| | - T Salez
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France and Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Hokkaido 060-0808, Japan.
| | - N Pantoustier
- Laboratoire Sciences et Ingénierie de la Matière Molle, PSL Research University, Sorbonne University, ESPCI Paris, UMR 7615 CNRS, 10 rue Vauquelin, 75231 Paris cedex 05, France
| | - P Perrin
- Laboratoire Sciences et Ingénierie de la Matière Molle, PSL Research University, Sorbonne University, ESPCI Paris, UMR 7615 CNRS, 10 rue Vauquelin, 75231 Paris cedex 05, France
| | - M Reyssat
- UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University, 75005 Paris, France
| | - C Monteux
- Laboratoire Sciences et Ingénierie de la Matière Molle, PSL Research University, Sorbonne University, ESPCI Paris, UMR 7615 CNRS, 10 rue Vauquelin, 75231 Paris cedex 05, France and Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Hokkaido 060-0808, Japan.
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da Silva Porto FG, Campos ÂD, Garcia ITS. Distilled pyroligneous liquor obtained from Eucalyptus grandis and chitosan: physicochemical properties of the solution and films. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:672-683. [PMID: 30414023 DOI: 10.1007/s11356-018-3590-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/23/2018] [Indexed: 06/08/2023]
Abstract
The pyroligneous liquor is a product obtained during the production of charcoal, with well-known antimicrobial activity. In this work, we characterized the physical chemistry properties of a formulation composed of distilled pyroligneous liquor (DPL), obtained from Eucalyptus grandis, and chitosan. A good interaction between the polymer and the solvent was observed. Auto-supported films were prepared with these systems and characterized with respect to their structure and photo-protection properties, water vapor permeability, and resistance to water and to thermal degradation. They present a semi-crystalline structure and are hygroscopic, but are stable under immersion for up to 7 days. The swelling degree in water is 300% in weight and the permeability to water vapor was between 30 and 45 g m-1 h-1 (for films with 80 to 10 μm, respectively). The obtained films are able to efficiently block the incident UVB and UVC radiation; the molar absorptivity decreases exponentially with increasing wavelength and is stable up to 300 °C. These properties confer desirable properties to the films, obtained from these precursors of a renewable source, to be used as coatings.
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Affiliation(s)
- Fabiane Grecco da Silva Porto
- Laboratório de Fisiologia Vegetal, Embrapa Clima Temperado, Br 392, Km 78, caixa postal 403, Pelotas, 96010-971, Brazil
| | - Ângela Diniz Campos
- Laboratório de Fisiologia Vegetal, Embrapa Clima Temperado, Br 392, Km 78, caixa postal 403, Pelotas, 96010-971, Brazil
| | - Irene Teresinha Santos Garcia
- Departamento de Físico-Química, Instituto de Química, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves 9500, Porto Alegre, RS, 91501-970, Brazil.
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8
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Lv Q, Li Z, Li B, Husein M, Shi D, Zhang C, Zhou T. Wall slipping behavior of foam with nanoparticle-armored bubbles and its flow resistance factor in cracks. Sci Rep 2017; 7:5063. [PMID: 28698608 PMCID: PMC5506061 DOI: 10.1038/s41598-017-05441-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 05/30/2017] [Indexed: 12/03/2022] Open
Abstract
In this work, wall slipping behavior of foam with nanoparticle-armored bubbles was first studied in a capillary tube and the novel multiphase foam was characterized by a slipping law. A crack model with a cuboid geometry was then used to compare with the foam slipping results from the capillary tube and also to evaluate the flow resistance factor of the foam. The results showed that the slipping friction force F FR in the capillary tube significantly increased by addition of modified SiO2 nanoparticles, and an appropriate power law exponents by fitting F FR vs. Capillary number, Ca, was 1/2. The modified nanoparticles at the surface were bridged together and formed a dense particle "armor" surrounding the bubble, and the interconnected structures of the "armor" with strong steric integrity made the surface solid-like, which was in agreement with the slip regime associated with rigid surface. Moreover, as confirmed by 3D microscopy, the roughness of the bubble surface increased with nanoparticle concentration, which in turn increased the slipping friction force. Compared with pure SDBS foam, SDBS/SiO2 foam shows excellent stability and high flow resistance in visual crack. The resistance factor of SiO2/SDBS foam increased as the wall surface roughness increased in core cracks.
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Affiliation(s)
- Qichao Lv
- College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China
| | - Zhaomin Li
- College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China.
| | - Binfei Li
- College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China
| | - Maen Husein
- Chemical and Petroleum Engineering, University of Calgary, Calgary, T2N4V8, Alberta, Canada.
| | - Dashan Shi
- College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China
| | - Chao Zhang
- College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China
| | - Tongke Zhou
- College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China
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9
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Lv Q, Li Z, Li B, Shi D, Zhang C, Li B. Silica nanoparticles as a high-performance filtrate reducer for foam fluid in porous media. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2016.09.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Cao XL, Feng J, Guo LL, Zhu YW, Zhang L, Zhang L, Luo L, Zhao S. Dynamic surface dilational properties of anionic Gemini surfactants with polyoxyethylene spacers. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.11.030] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Lv Q, Li Z, Li B, Li S, Sun Q. Study of Nanoparticle–Surfactant-Stabilized Foam as a Fracturing Fluid. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02197] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Qichao Lv
- College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
| | - Zhaomin Li
- College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
| | - Binfei Li
- College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
| | - Songyan Li
- College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
| | - Qian Sun
- College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
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12
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Noskov BA, Bykov AG. Dilational surface rheology of polymer solutions. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4518] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Li M, Du F, Cao C, Li B, Zhai X. Effect of Glyphosate Isopropylamine on the Surface Tension and Surface Dilational Rheology Properties of Polyoxyethylene Tallow Amine Surfactant. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2015.1039022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Methylcellulose, a Cellulose Derivative with Original Physical Properties and Extended Applications. Polymers (Basel) 2015. [DOI: 10.3390/polym7050777] [Citation(s) in RCA: 220] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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15
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16
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Genest S, Schwarz S, Petzold-Welcke K, Heinze T, Voit B. Characterization of highly substituted, cationic amphiphilic starch derivatives: Dynamic surface tension and intrinsic viscosity. STARCH-STARKE 2013. [DOI: 10.1002/star.201200295] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sabine Genest
- Leibniz-Institut für Polymerforschung Dresden e.V.; Dresden Germany
- Organische Chemie der Polymere; Technische Universität Dresden; Dresden Germany
| | - Simona Schwarz
- Leibniz-Institut für Polymerforschung Dresden e.V.; Dresden Germany
| | - Katrin Petzold-Welcke
- Center of Excellence for Polysaccharide Research; Friedrich Schiller University of Jena; Jena Germany
| | - Thomas Heinze
- Center of Excellence for Polysaccharide Research; Friedrich Schiller University of Jena; Jena Germany
| | - Brigitte Voit
- Leibniz-Institut für Polymerforschung Dresden e.V.; Dresden Germany
- Organische Chemie der Polymere; Technische Universität Dresden; Dresden Germany
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17
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Romero A, Verwijlen T, Guerrero A, Vermant J. Interfacial properties of crayfish protein isolate/chitosan mixed films. Food Hydrocoll 2013. [DOI: 10.1016/j.foodhyd.2013.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Serfert Y, Schröder J, Mescher A, Laackmann J, Shaikh MQ, Rätzke K, Gaukel V, Schuchmann HP, Walzel P, Moritz HU, Drusch S, Schwarz K. Characterization of the spray drying behaviour of emulsions containing oil droplets with a structured interface. J Microencapsul 2012; 30:325-34. [DOI: 10.3109/02652048.2012.726282] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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19
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Physicochemical properties of biopolymer-based polyelectrolyte complexes with controlled pH/thermo-responsiveness. REACT FUNCT POLYM 2012. [DOI: 10.1016/j.reactfunctpolym.2012.04.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Li ZQ. Interfacial Dilational Properties of Hydrophobically Modified Partly Hydrolyzed Polyacrylamide and Anionic Surfactants at the Water-Decane Interface. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903297033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Noskov BA. Dilational surface rheology of polymer and polymer/surfactant solutions. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.01.006] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Calero N, Muñoz J, Ramírez P, Guerrero A. Flow behaviour, linear viscoelasticity and surface properties of chitosan aqueous solutions. Food Hydrocoll 2010. [DOI: 10.1016/j.foodhyd.2010.03.009] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Pavinatto FJ, Caseli L, Oliveira ON. Chitosan in Nanostructured Thin Films. Biomacromolecules 2010; 11:1897-908. [DOI: 10.1021/bm1004838] [Citation(s) in RCA: 155] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Felippe J. Pavinatto
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brasil, and Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Diadema, SP, Brasil
| | - Luciano Caseli
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brasil, and Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Diadema, SP, Brasil
| | - Osvaldo N. Oliveira
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brasil, and Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Diadema, SP, Brasil
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Kundu SK, Yoshida M, Shibayama M. Effect of salt content on the rheological properties of hydrogel based on oligomeric electrolyte. J Phys Chem B 2010; 114:1541-7. [PMID: 20055469 DOI: 10.1021/jp906312f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dynamic light scattering and oscillatory rheology experiments were performed to study the effects of various salts on the hydrogel consisting of an oligomeric electrolyte gelator, poly(pyridinium-1,4-diyliminocarbonyl-1,4-phenylenemethylene chloride) (1-Cl). Sol-gel transition temperature increased with increasing salt concentration that suggested the salt-in behavior. The concentration dependence of the dynamic shear moduli showed power-law scaling behavior and was compared with the predictions made by the fractal gel model. The brittleness was increased by increasing salt concentration, indicating that 1-Cl hydrogel became better packed into stronger networks in ionic solutions. After certain salt concentrations, 1-Cl hydrogel started precipitation that might be due to the excessive network formation resulting in collapse of the network structure. The recovery of the mechanical properties of 1-Cl hydrogel was completely reduced in the presence of salts.
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Affiliation(s)
- Shyamal Kumar Kundu
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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25
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Zhao J, Culligan PJ, Germaine JT, Chen X. Experimental study on energy dissipation of electrolytes in nanopores. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12687-12696. [PMID: 19791780 DOI: 10.1021/la901696t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
When a nonwetting fluid is forced to infiltrate a hydrophobic nanoporous solid, the external mechanical work is partially dissipated into thermal energy and partially converted to the liquid-solid interface energy to increase its enthalpy, resulting in a system with a superior energy absorption performance. To clarify the energy dissipation and conversion mechanisms, experimental infiltration and defiltration tests of liquid/ion solutions into nanopores of a hydrophobic ZSM-5 zeolite were conducted. The characteristics of energy dissipation were quantified by measuring the temperature variation of the immersed liquid environment and compared against that estimated from pressure-infiltration volume isotherms during infiltration and defiltration stages of the test. Both stages were observed to be endothermic, with the temperature of the liquid phase showing a steady increase with changes in liquid saturation. The confinement of the molecular-sized pore space causes the liquid molecules/ions to transit between statuses of orderly and disorderly motions, resulting in dissipation behaviors that vary with liquid infiltration/defiltration rates and the types and concentrations of additive electrolytes in the liquid-both factors of which alter the characteristics of the nanofluidic transport behavior.
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Affiliation(s)
- Jianbing Zhao
- School of Engineering and Applied Sciences, Columbia University, New York, New York 10027, USA
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Marze S. Relaxation processes of PGPR at the water/oil interface inferred by oscillatory or transient viscoelasticity measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12066-12072. [PMID: 19764774 DOI: 10.1021/la9016849] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The rheological properties of PolyGlycerol PolyRicinoleate (PGPR) at the oil/water interface were studied using a drop-shaped tensiometer. Small deformation oscillations of the drop area allow the measurement of the interfacial viscoelasticity spectrum, that is, the elastic and viscous moduli as a function of frequency. Another way to obtain such a spectrum is to perform a transient relaxation measurement from which the relaxation modulus as a function of time is deduced and interpreted. Several models containing one or more relaxation times were considered, and their resulting spectra were compared to the oscillatory ones. Similar results suggest that one could in principle use oscillatory or transient relaxations indifferently. However, the transient relaxation technique proved to be more adapted for the determination of the relaxation times. At low PGPR concentrations in oil, the behavior is controlled by long relaxation times, whereas short ones take over when approaching and exceeding the saturation interfacial concentration. This was understood as a shift from a diffusion-dominated regime to a rearrangements-dominated regime.
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Affiliation(s)
- Sébastien Marze
- Nestlé Research Center, Vers-chez-les-Blanc, CH-1000 Lausanne 26, Switzerland.
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27
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Dong X, Sun D, Liu G, Cao C, Jiang X. Aqueous foam stabilized by hydrophobically modified cellulose and alkyl polyoxyethyl sulfate complex in the presence and absence of electrolytes. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.04.039] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Rinaudo M, Kil’deeva NR, Babak VG. Surfactant-polyelectrolyte complexes on the basis of chitin. RUSS J GEN CHEM+ 2008. [DOI: 10.1134/s1070363208110455] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Babak VG, Baros F, Boury F, Desbrières J. Dilational viscoelasticity and relaxation properties of interfacial electrostatic complexes between oppositely charged hydrophobic and hydrophilic polyelectrolytes. Colloids Surf B Biointerfaces 2008; 65:43-9. [DOI: 10.1016/j.colsurfb.2008.02.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2007] [Revised: 02/17/2008] [Accepted: 02/20/2008] [Indexed: 11/30/2022]
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30
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Polycondensation in tetradecaethoxyhexasiloxane adsorption layers at the methylene chloride/water interface under alkaline conditions: application to the formulation of hollow microcapsules. MENDELEEV COMMUNICATIONS 2008. [DOI: 10.1016/j.mencom.2008.07.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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31
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Dilational rheology and relaxation properties of the adsorption layers of electrostatic complexes between Eudragit RS and chitosan sulfate at the methylene chloride–water interface. MENDELEEV COMMUNICATIONS 2008. [DOI: 10.1016/j.mencom.2008.01.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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