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Sadraddin A. Synthesis and characterization of novel thermoresponsive suspensions via physical adsorption of poly[di(ethylene glycol) methyl methacrylate] onto polystyrene microparticles. Des Monomers Polym 2023; 26:163-170. [PMID: 37181151 PMCID: PMC10173789 DOI: 10.1080/15685551.2023.2211356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 05/03/2023] [Indexed: 05/16/2023] Open
Abstract
Thermoreversible colloidal suspensions/gels have attracted recent research attention in the field of biomedical applications. In this study, a novel thermoresponsive particle suspension with thermoreversible gelation properties has been prepared for biomedical application. First, polystyrene (PS) microspheres were synthesized by dispersion polymerization and poly diethyleneglycolmethylmethacrylate (PDEGMA) polymer were synthesized via free radical polymerisation. Then, the new developed thermoresponsive suspensions were prepared via physical adsorption of a thermoresponsive polymer, poly[di (ethylene glycol) methyl methacrylate] (PDEGMA), onto the surface of polystyrene microspheres. PDEGMA acts as a steric stabilizer and induces thermoreversible gelation via chain extending and collapsing below and above its lower critical solution temperature (LCST), respectively. Scanning electron microscopy (SEM), 1H NMR spectroscopy, Gel permeation chromatography (GPC), UV-vis spectroscopy, Rheometric measurement were conducted to characterize the prepared particles, polymers and suspensions. SEM images show that monodisperse microspheres with the sizes range 1.5-3.5 μm were prepared. UV-vis measurements demonstrate thermoresponsive properties of PDEGMA. 1H NMR and GPC analysis confirms structural properties of prepared PDEGMA. Tube inversion tests demonstrated that the aqueous suspensions of the particles and polymer exhibited thermoreversible fluid-to-gel transitions. Rheological characterization revealed that the viscoelastic properties of the prepared suspension/gels can be fine tuned. This enables applications of the prepared gels as scaffolds for three-dimensional (3D) cell cultures.
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Affiliation(s)
- Azad Sadraddin
- Chemistry Department, Education College, Salahaddin University, Iraqi kurdistan, Iraq
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2
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Zhang H, You W, Bian F, Yu W. Heterogeneous Percolation in Poly(methylvinylsiloxane)/Silica Nanocomposites: The Role of Polymer–Particle Interaction. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01615] [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]
Affiliation(s)
- Hao Zhang
- Advanced Rheology Institute, Department of Polymer Science and Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai200240, People’s Republic of China
| | - Wei You
- Advanced Rheology Institute, Department of Polymer Science and Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai200240, People’s Republic of China
| | - Fenggang Bian
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai201800, People’s Republic of China
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai201204, People’s Republic of China
| | - Wei Yu
- Advanced Rheology Institute, Department of Polymer Science and Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai200240, People’s Republic of China
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3
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Influence of different dispersing systems on rheological and microstructural properties of citrus fiber suspensions. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.112270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Biglarian N, Rafe A, Shahidi SA. Effect of basil seed gum and κ-carrageenan on the rheological, textural, and structural properties of whipped cream. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2021; 101:5851-5860. [PMID: 33788968 DOI: 10.1002/jsfa.11237] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/18/2021] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Basil seed gum (BSG) is a novel polysaccharide that has been found wide application in the food industry. It can be used in whipped cream due to its thickening and emulsifying properties. The effect of BSG and κ-carrageenan on the structure-rheology relationships of whipped cream was evaluated. RESULTS The viscosity of cream containing BSG was higher than that of carrageenan. Basil seed gum resulted in a strong capacity to improve the viscosity of the cream. Rheological results showed the low-frequency dependence of the elastic modulus was improved by BSG, which had a strong effect on the rigidity of the emulsion. The fracture strain of the creams containing BSG or κ-carrageenan was between the normal cream and acidified caseinate stabilized emulsion foam. It was found that the protein segments of BSG could be adsorbed at the oil-water interface, resulting in the formation of a pseudo-gel network, which creates a stronger molecular protein network in the whipped cream. Microstructure study revealed that whipped cream containing κ-carrageenan exhibited some flocculation, which could be caused by non-adsorbed polysaccharides or proteins. In contrast, cream containing BSGshowed more voids, which have considerably decreased by fat content and enhance the foam structure. CONCLUSION As a result, synergistic interactions between proteins and polysaccharides (BSG and κ-carrageenan) could promote the development of a cross-linked network. Indeed, due to its high levels of hydrophilicity, BSG absorbs water, acts as a thickening agent, and competes against caseinate at the interfaces and is incorporated into whipped cream to provide a more desirable physical structure for the product. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Niloofar Biglarian
- Department of Food Science and Technology, Collage of Agriculture and Food Science, Ayattolah Amoli Branch, Islamic Azad University, Amol, Iran
| | - Ali Rafe
- Department of Food Processing, Research Institute of Food Sciecne and Technology (RIFST), Mashhad, Iran
| | - Seyed-Ahmad Shahidi
- Department of Food Science and Technology, Collage of Agriculture and Food Science, Ayattolah Amoli Branch, Islamic Azad University, Amol, Iran
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Technological strategies to improve gelation properties of legume proteins with the focus on lupin. INNOV FOOD SCI EMERG 2021. [DOI: 10.1016/j.ifset.2021.102634] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Thompson ES, Declercq M, Saveyn P, Guida V, Robles ESJ, Britton MM. Phase separation and collapse in almost density matched depletion induced colloidal gels in presence and absence of air bubbles: An MRI imaging study. J Colloid Interface Sci 2021; 582:201-211. [PMID: 32823122 DOI: 10.1016/j.jcis.2020.07.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 11/17/2022]
Abstract
HYPOTHESIS Vesicle-polymer dispersions are found in drug-delivery systems and consumer products but undergo phase separation. Previous studies of phase separation have focussed on systems with high density differences between continuous and vesicular phases. In this study, we investigate phase separation in vesicle-polymer mixtures with very small density differences, in the presence and absence of air bubbles. EXPERIMENTS Magnetic resonance (MR) imaging, X-ray Computed Tomography and rheological measurements are reported which characterise the properties and stability of vesicle suspensions composed of the cationic surfactant, diethylesterdimethyl ammonium chloride, mixed with non-adsorbing polymer. 1H T2 MR relaxation images are employed to observe phase separation, for a range of vesicle-polymer mixtures, which are analysed using Moran's I spatial autocorrelation to quantify the extent and rate of phase separation. FINDINGS It was found that in presence of air bubbles, phase separation follows a compression/collapse mechanism, typical of colloidal gels with large density differences between the phases. Without air bubbles, phase separation develops through the formation of tiny cracks and fractures in the samples. MRI enabled visualisation of the evolution of phase separation inside highly turbid samples. The rate of phase separation was found to generally increase with increasing polymer concentration and decrease with increasing vesicle volume fraction.
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Affiliation(s)
- Emma S Thompson
- School of Chemistry, University of Birmingham, Birmingham B15 2TT, UK
| | - Marc Declercq
- Procter & Gamble Brussels Innovation Center, 1853 Strombeek Bever, Temselaan 100, Belgium
| | - Pieter Saveyn
- Procter & Gamble Brussels Innovation Center, 1853 Strombeek Bever, Temselaan 100, Belgium
| | - Vincenzo Guida
- Procter & Gamble Brussels Innovation Center, 1853 Strombeek Bever, Temselaan 100, Belgium
| | - Eric S J Robles
- Procter & Gamble Company, Newcastle Innovation Centre, Newcastle-Upon-Tyne NE12 9TS, UK
| | - Melanie M Britton
- School of Chemistry, University of Birmingham, Birmingham B15 2TT, UK.
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Irreversible hardening of a colloidal gel under shear: The smart response of natural rubber latex gels. J Colloid Interface Sci 2019; 539:287-296. [DOI: 10.1016/j.jcis.2018.12.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 12/05/2018] [Accepted: 12/07/2018] [Indexed: 11/21/2022]
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8
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Lemesre L, Frances F, Grandjean A, Gossard A. Hybrid colloidal suspensions tailored as gels to remove radioactive bitumen stains. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 232:660-665. [PMID: 30522071 DOI: 10.1016/j.jenvman.2018.11.125] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 10/29/2018] [Accepted: 11/25/2018] [Indexed: 06/09/2023]
Abstract
Vacuumable gels have been developed in the nuclear industry to decontaminate solid surfaces with little or no mechanical operations and without producing any liquid effluents. These gels can be spread on the contaminated surface and rapidly trap the radio-contaminants by sorption after corroding the substrate down to several tens of microns if necessary. The gel then dries and eventually fractures into a non-powdery solid that is easily removable by brushing or vacuum cleaning. This process was initially developed for the nuclear decontamination of metallic surfaces but innovative formulations are being developed for wide range of applications. This paper introduces two such formulations designed to remove sticky organic layers, bitumen in this study. We show that adding an organic bio-solvent, limonene, allows bitumen layers to be dissolved, absorbed in the liquid state into the gel matrix, and then removed from the substrate as solid waste after drying. Substituting an organic co-solvent (ethanol) for some of the limonene improves the overall efficiency of the process by decreasing the drying time of the gel and limiting the diffusion of the dissolved bitumen without affecting the dissolving power of the gel. Finally, the performance of these gels is demonstrated for the removal of nuclear contaminated (137Cs) bitumen stains.
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Affiliation(s)
- Louise Lemesre
- CEA, DEN, Univ Montpellier, DE2D, SEAD, Laboratoire des Procédés Supercritiqueset de Décontamination, Marcoule, F-30207Bagnols-sur-Cèze, France
| | - Fabien Frances
- CEA, DEN, Univ Montpellier, DE2D, SEAD, Laboratoire des Procédés Supercritiqueset de Décontamination, Marcoule, F-30207Bagnols-sur-Cèze, France
| | - Agnès Grandjean
- CEA, DEN, Univ Montpellier, DE2D, SEAD, Laboratoire des Procédés Supercritiqueset de Décontamination, Marcoule, F-30207Bagnols-sur-Cèze, France
| | - Alban Gossard
- CEA, DEN, Univ Montpellier, DE2D, SEAD, Laboratoire des Procédés Supercritiqueset de Décontamination, Marcoule, F-30207Bagnols-sur-Cèze, France.
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9
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Zhang Q, Xu H, Song Y, Zheng Q. Rheological behavior of fumed silica filled polyethylene oxide. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/polb.24794] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Qingxu Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou, 310027 China
| | - Huilong Xu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou, 310027 China
| | - Yihu Song
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou, 310027 China
| | - Qiang Zheng
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou, 310027 China
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Unusual multiscale mechanics of biomimetic nanoparticle hydrogels. Nat Commun 2018; 9:181. [PMID: 29330415 PMCID: PMC5766503 DOI: 10.1038/s41467-017-02579-w] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 12/12/2017] [Indexed: 12/14/2022] Open
Abstract
Viscoelastic properties are central for gels and other materials. Simultaneously, high storage and loss moduli are difficult to attain due to their contrarian requirements to chemical structure. Biomimetic inorganic nanoparticles offer a promising toolbox for multiscale engineering of gel mechanics, but a conceptual framework for their molecular, nanoscale, mesoscale, and microscale engineering as viscoelastic materials is absent. Here we show nanoparticle gels with simultaneously high storage and loss moduli from CdTe nanoparticles. Viscoelastic figure of merit reaches 1.83 MPa exceeding that of comparable gels by 100–1000 times for glutathione-stabilized nanoparticles. The gels made from the smallest nanoparticles display the highest stiffness, which was attributed to the drastic change of GSH configurations when nanoparticles decrease in size. A computational model accounting for the difference in nanoparticle interactions for variable GSH configurations describes the unusual trends of nanoparticle gel viscoelasticity. These observations are generalizable to other NP gels interconnected by supramolecular interactions and lead to materials with high-load bearing abilities and energy dissipation needed for multiple technologies. Achieving simultaneous high storage and loss moduli in gels is difficult due to the opposite chemical structure requirements needed for such properties. Here the authors show a spectrum of gels containing CdTe nanoparticles stabilized by glutathione that have such properties which can be rationalised through the developed model.
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Song Y, Zeng L, Zheng Q. Reconsideration of the Rheology of Silica Filled Natural Rubber Compounds. J Phys Chem B 2017; 121:5867-5875. [PMID: 28520426 DOI: 10.1021/acs.jpcb.7b02760] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
There is substantial progress along with giant debate in reinforcement mechanisms in relation to structured filler network and heterogeneously retarded polymer dynamics, while the dissipation behaviors have never been clarified for nanoparticle filled polymers. Herein dynamic rheological behaviors of silica filled natural rubber were investigated. Master curves of linear rheology in the hydrodynamic regime and those of the nonlinear Payne effect at a predetermined frequency were created, disclosing a leading role of dynamically retarded bulk rubbery phase to the hydrodynamic regime and a leading role of molecular disentanglement in the bulk phase to the Payne effect. The methodology is able to account for both reinforcement and dissipation of the compounds as a function of filler content. Furthermore, a frequency-dependent hydrodynamic to non-hydrodynamic transition is revealed, revealing the importance of the relaxation of chains in the bulk phase to both reinforcement and dissipation of the compounds. It is suggested that the dynamics of the bulk phase play a critical role for the rheology in the hydrodynamic regime while the fractal filler aggregates become dominative only in the terminal non-hydrodynamic regime where the bulk phase relaxes sufficiently.
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Affiliation(s)
- Yihu Song
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , Hangzhou 310027, China
| | - Lingbin Zeng
- Shanghai Aerospace System Engineering Institute , Shanghai 201110, China
| | - Qiang Zheng
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , Hangzhou 310027, China
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12
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Gossard A, Frances F, Aloin C. Rheological properties of TiO2 suspensions varied by shifting the electrostatic inter-particle interactions with an organic co-solvent. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.03.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Petkova-Olsson Y, Ullsten H, Järnström L. Thermosensitive Silica-Pluronic-Starch model coating dispersion-Part II: The relationship between rheology and microstructure. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Petkova-Olsson Y, Ullsten H, Järnström L. Thermosensitive silica-pluronic-starch model coating dispersion-part I: The effect of Pluronic block copolymer adsorption on the colloidal stability and rheology. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.06.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Minami S, Watanabe T, Suzuki D, Urayama K. Rheological properties of suspensions of thermo-responsive poly(N-isopropylacrylamide) microgels undergoing volume phase transition. Polym J 2016. [DOI: 10.1038/pj.2016.79] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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17
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A topping gel for the treatment of nuclear contaminated small items. NUCLEAR ENGINEERING AND DESIGN 2014. [DOI: 10.1016/j.nucengdes.2014.07.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Helgeson ME, Gao Y, Moran SE, Lee J, Godfrin M, Tripathi A, Bose A, Doyle PS. Homogeneous percolation versus arrested phase separation in attractively-driven nanoemulsion colloidal gels. SOFT MATTER 2014; 10:3122-3133. [PMID: 24695862 DOI: 10.1039/c3sm52951g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We elucidate mechanisms for colloidal gelation of attractive nanoemulsions depending on the volume fraction (ϕ) of the colloid. Combining detailed neutron scattering, cryo-transmission electron microscopy and rheological measurements, we demonstrate that gelation proceeds by either of two distinct pathways. For ϕ sufficiently lower than 0.23, gels exhibit homogeneous fractal microstructure, with a broad gel transition resulting from the formation and subsequent percolation of droplet-droplet clusters. In these cases, the gel point measured by rheology corresponds precisely to arrest of the fractal microstructure, and the nonlinear rheology of the gel is characterized by a single yielding process. By contrast, gelation for ϕ sufficiently higher than 0.23 is characterized by an abrupt transition from dispersed droplets to dense clusters with significant long-range correlations well-described by a model for phase separation. The latter phenomenon manifests itself as micron-scale "pores" within the droplet network, and the nonlinear rheology is characterized by a broad yielding transition. Our studies reinforce the similarity of nanoemulsions to solid particulates, and identify important qualitative differences between the microstructure and viscoelastic properties of colloidal gels formed by homogeneous percolation and those formed by phase separation.
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Affiliation(s)
- Matthew E Helgeson
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA 93117, USA.
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19
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20
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Castellani R, Poulesquen A, Goettmann F, Marchal P, Choplin L. Ions effects on sol–gel transition and rheological behavior in alumina slurries. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.03.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Thermoresponsive gelling behavior of concentrated alumina suspensions containing poly(acrylic acid) and PEO–PPO–PEO copolymer. J Colloid Interface Sci 2012; 373:20-6. [DOI: 10.1016/j.jcis.2011.09.071] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 09/22/2011] [Accepted: 09/26/2011] [Indexed: 11/23/2022]
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22
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Day L, Xu M, Øiseth SK, Lundin L, Hemar Y. Dynamic rheological properties of plant cell-wall particle dispersions. Colloids Surf B Biointerfaces 2010; 81:461-7. [DOI: 10.1016/j.colsurfb.2010.07.041] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2010] [Revised: 07/16/2010] [Accepted: 07/20/2010] [Indexed: 11/30/2022]
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23
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Zhou Y, Yu H, Wanless EJ, Jameson GJ, Franks GV. Influence of polymer charge on the shear yield stress of silica aggregated with adsorbed cationic polymers. J Colloid Interface Sci 2009; 336:533-43. [DOI: 10.1016/j.jcis.2009.04.027] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Revised: 02/28/2009] [Accepted: 04/01/2009] [Indexed: 10/20/2022]
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24
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25
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Wu D, Sun Y, Zhang M. Kinetics study on melt compounding of carbon nanotube/polypropylene nanocomposites. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/polb.21668] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Wennerstrand AW, Olsson M, Järnström L, Koschella A, Fenn D, Heinze T. Influence of the functionalization pattern of ethyl cellulose on the interactions with polystyrene latex particles in aqueous mixtures. J Colloid Interface Sci 2008; 327:51-7. [DOI: 10.1016/j.jcis.2008.07.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2008] [Revised: 07/03/2008] [Accepted: 07/04/2008] [Indexed: 11/30/2022]
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27
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Allen KE, Murray BS, Dickinson E. Whipped cream-like textured systems based on acidified caseinate-stabilized oil-in-water emulsions. Int Dairy J 2008. [DOI: 10.1016/j.idairyj.2008.04.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Development of a model whipped cream: Effects of emulsion droplet liquid/solid character and added hydrocolloid. Food Hydrocoll 2008. [DOI: 10.1016/j.foodhyd.2007.01.017] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Saiki Y, Horn RG, Prestidge CA. Droplet structure instability in concentrated emulsions. J Colloid Interface Sci 2008; 320:569-74. [DOI: 10.1016/j.jcis.2008.01.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2007] [Revised: 11/20/2007] [Accepted: 01/08/2008] [Indexed: 11/16/2022]
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30
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31
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Girard M, Schaffer-Lequart C. Gelation of skim milk containing anionic exopolysaccharides and recovery of texture after shearing. Food Hydrocoll 2007. [DOI: 10.1016/j.foodhyd.2006.07.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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32
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Effect of an excess of polyelectrolyte on viscoelastic properties of suspensions of alumina and zircon mixtures. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2007.01.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Investigation of the link between micromechanical interparticle bond rigidity measurements and macroscopic shear moduli of colloidal gels. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.12.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Studart AR, Amstad E, Gauckler LJ. Colloidal stabilization of nanoparticles in concentrated suspensions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:1081-90. [PMID: 17241017 DOI: 10.1021/la062042s] [Citation(s) in RCA: 132] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The stabilization of nanoparticles in concentrated aqueous suspensions is required in many manufacturing technologies and industrial products. Nanoparticles are commonly stabilized through the adsorption of a dispersant layer around the particle surface. The formation of a dispersant layer (adlayer) of appropriate thickness is crucial for the stabilization of suspensions containing high nanoparticle concentrations. Thick adlayers result in an excessive excluded volume around the particles, whereas thin adlayers lead to particle agglomeration. Both effects reduce the maximum concentration of nanoparticles in the suspension. However, conventional dispersants do not allow for a systematic control of the adlayer thickness on the particle surface. In this study, we synthesized dispersants with a molecular architecture that enables better control over the particle adlayer thickness. By tailoring the chemistry and length of these novel dispersants, we were able to prepare fluid suspensions (viscosity < 1 Pa.s at 100 s-1) with more than 40 vol % of 65-nm alumina particles in water, as opposed to the 30 vol % achieved with a state-of-the-art dispersing agent. This remarkably high concentration facilitates the fabrication of a wide range of products and intermediates in materials technology, cosmetics, pharmacy, and in all other areas where concentrated nanoparticle suspensions are required. On the basis of the proposed molecular architecture, one can also envisage other similar molecules that could be successfully applied for the functionalization of surfaces for biosensing, chromatography, medical imaging, drug delivery, and aqueous lubrication, among others.
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Affiliation(s)
- André R Studart
- Department of Materials, ETH-Zurich, Zurich, CH 8093, Switzerland.
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Cruz RCD, Reinshagen J, Oberacker R, Segadães AM, Hoffmann MJ. Electrical conductivity and stability of concentrated aqueous alumina suspensions. J Colloid Interface Sci 2006; 286:579-88. [PMID: 15897074 DOI: 10.1016/j.jcis.2005.02.025] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Accepted: 02/08/2005] [Indexed: 11/29/2022]
Abstract
This work describes the effect of solids load and ionic strength on the electrical conductivity (K(S)) of concentrated aqueous suspensions of commercial alpha-alumina (1-35 vol% solids). The results obtained show that the dependency of the electrical conductivity of the suspending liquid (K(L)) on the volume fraction of solids is well described by Maxwell's model. The change in the conductivity of the suspensions relative to that of the suspending liquid (K(S)/K(L)) was found to be inversely proportional to the solids content, as predicted by Maxwell's model. The relative conductivity rate, DeltaK, could be interpreted in terms of the DLVO theory and the particles double layer parameter, kappaa, and used as a stability criterion. As kappaa changes, in response to the changes in ionic strength, so does the conducting to insulating character of the particles and, as such, their contribution to the overall suspension conductivity (expressed by DeltaK). When the particles become insulating, the suspension conductivity decreases when the solids load increases. The turning point in this particle behaviour corresponds to a critical concentration of ions in the solution that destabilises the suspension and is associated with the critical coagulation concentration (ccc). It is the electrical double layer that ultimately determines the conducting or insulating character of the particles, and that character can be made to change, as required for suspension stability, and accessed by the relative conductivity rate.
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Affiliation(s)
- Robinson C D Cruz
- University of Karlsruhe, Institute of Ceramics in Mechanical Engineering, D-76131 Karlsruhe, Germany
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36
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Ramakrishnan S, Zukoski CF. Microstructure and rheology of thermoreversible nanoparticle gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7833-42. [PMID: 16922571 DOI: 10.1021/la060168j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Naïve mode coupling theory is applied to particles interacting with short-range Yukawa attractions. Model results for the location of the gel line and the modulus of the resulting gels are reduced to algebraic equations capturing the effects of the range and strength of attraction. This model is then applied to thermo reversible gels composed of octadecyl silica particles suspended in decalin. The application of the model to the experimental system requires linking the experimental variable controlling strength of attraction, temperature, to the model strength of attraction. With this link, the model predicts temperature and volume fraction dependencies of gelation and modulus with five parameters: particle size, particle volume fraction, overlap volume of surface hairs, and theta temperature. In comparing model predictions with experimental results, we first observe that in these thermal gels there is no evidence of clustering as has been reported in depletion gels. One consequence of this observation is that there are no additional adjustable parameters required to make quantitative comparisons between experimental results and model predictions. Our results indicate that the naïve mode coupling approach taken here in conjunction with a model linking temperature to strength of attraction provides a robust approach for making quantitative predictions of gel mechanical properties. Extension of model predictions to additional experimental systems requires linking experimental variables to the Yukawa strength and range of attraction.
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Affiliation(s)
- S Ramakrishnan
- Department of Chemical and Biomedical Engineering, Florida A&M-Florida State University, Tallahassee, Florida 32310, USA
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37
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Allen KE, Dickinson E, Murray B. Acidified sodium caseinate emulsion foams containing liquid fat: A comparison with whipped cream. Lebensm Wiss Technol 2006. [DOI: 10.1016/j.lwt.2005.02.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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38
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Ramakrishnan S, Gopalakrishnan V, Zukoski CF. Clustering and mechanics in dense depletion and thermal gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9917-25. [PMID: 16229509 DOI: 10.1021/la050830w] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We report on the microstructure and mechanical properties (elastic modulus) of concentrated depletion and thermal gels of octadecyl-coated silica particles for different values of the strength of interaction--polymer concentration for depletion gels and temperature for thermal gels. The depletion gels are composed of dense clusters and voids, while the thermal gels are devoid of clusters. Shear breaks up clusters in depletion gels while it induces clustering in the thermal gels. In both of these gels, the microstructure recovers to the presheared state upon cessation of shear. The recovery of the elastic modulus mimics the microstructure in the sense that the elastic modulus recovers to the presheared sheared state after shearing is stopped. Calculations of the gel boundary by modeling the interactions with an effective one-component square-well model reveals that suspensions with similar ranges of attraction gel at the same volume fraction at a fixed strength of attraction. Calculations of the elastic modulus using the naïve mode coupling theory for depletion gels are in good agreement with experimental measurements provided clustering is taken into account and have the same magnitude as the elastic moduli of thermal gels with similar strengths of attraction. These calculations, in addition to the experimental observations reinforce the point that the microscopic parameter determining the elastic modulus of dense gels and its recovery is the localization length which is only a fraction of the particle diameter and not the structure on the length scale of the particle diameter and larger.
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Affiliation(s)
- S Ramakrishnan
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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39
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Bell NS, Schendel ME, Piech M. Rheological properties of nanopowder alumina coated with adsorbed fatty acids. J Colloid Interface Sci 2005; 287:94-106. [PMID: 15914153 DOI: 10.1016/j.jcis.2005.01.113] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2004] [Revised: 01/28/2005] [Accepted: 01/31/2005] [Indexed: 10/25/2022]
Abstract
The rheological properties of a nanosized alumina powder coated with fatty acid steric stabilizers of varying chain length were investigated. The storage and loss moduli of the complex modulus were measured to characterize the behavior of the flocculated systems. As chain length increased, there was a transition from an elastic response to fluid behavior. However, the fluid system developed elastic characteristics at relatively low volume fractions of 22%. The length of the steric barrier required to produce the fluid dispersion was estimated to be approximately 2 nm and correlates with attractive interactions on the order of the system thermal energy. Moreover, in the flocculated systems, the storage modulus was found to be higher than reported previously in the literature. These higher values were related to the additional attractive forces due to van der Waals attractions between the hydrocarbon tails of the adsorbed fatty acid layers.
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Affiliation(s)
- Nelson S Bell
- Sandia National Laboratories, Albuquerque, NM 87185-1411, USA.
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40
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Wu D, Zhou C, Zheng H. A rheological study on kinetics of poly(butylene terephthalate) melt intercalation. J Appl Polym Sci 2005. [DOI: 10.1002/app.22571] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Trompette JL, Clifton MJ. Influence of ionic specificity on the microstructure and the strength of gelled colloidal silica suspensions. J Colloid Interface Sci 2004; 276:475-82. [PMID: 15271576 DOI: 10.1016/j.jcis.2004.03.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Accepted: 03/18/2004] [Indexed: 11/21/2022]
Abstract
The dynamic rheological behavior of gelled Ludox suspensions in the presence of the structure-breaker ammonium counterion and the structure-maker sodium counterion has been investigated. Depending on the nature of the electrolyte and its concentration, the results highlight the crucial effect of the network microstructure on the rheological results. Within the same microstructure, the strength of gelled networks has been found to be greater in the presence of the poorly hydrated ammonium counterions at any Ludox volume fraction. The obtained results were discussed with respect to recent contradictory trends reported in the literature concerning the behavior of silica suspensions.
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Affiliation(s)
- J L Trompette
- Laboratoire de Génie Chimique UMR 5503, Université Paul Sabatier, 118, route de Narbonne, Toulouse 31062 Cedex, France.
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42
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Wyss HM, Tervoort E, Meier LP, Müller M, Gauckler LJ. Relation between microstructure and mechanical behavior of concentrated silica gels. J Colloid Interface Sci 2004; 273:455-62. [PMID: 15082380 DOI: 10.1016/j.jcis.2004.01.065] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2003] [Accepted: 01/30/2004] [Indexed: 11/27/2022]
Abstract
We produce concentrated (40 vol%) gels of uniformly sized silica particles by an in situ process, based on the enzyme-catalyzed hydrolysis of urea in the liquid phase of electrostatically stabilized suspensions. Two different methods are used: Either the pH of the suspensions is shifted toward the isoelectric point of the particles (delta pH method), or the ionic strength is continuously increased at constant pH (deltaI method). We compare the two kinds of gels in terms of elastic and yield behavior as well as microstructure by using rheological measurements in oscillation and high-pressure freezing in combination with cryo-SEM, respectively. Results suggest a strong increase of elastic and yield properties in concentrated particle gels with decreasing homogeneity of their microstructures.
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Affiliation(s)
- Hans M Wyss
- Nonmetallic Materials, Department of Materials, ETH Zurich, Zurich, CH-8092, Switzerland
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43
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Shah SA, Chen YL, Schweizer KS, Zukoski CF. Viscoelasticity and rheology of depletion flocculated gels and fluids. J Chem Phys 2003. [DOI: 10.1063/1.1598192] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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44
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Li J, Zhou C, Wang G, Zhao D. Study on kinetics of polymer melt intercalation by a rheological approach. J Appl Polym Sci 2003. [DOI: 10.1002/app.12094] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Berli CL, Quemada D, Parker A. Gel transition of depletion flocculated emulsions. Colloids Surf A Physicochem Eng Asp 2003. [DOI: 10.1016/s0927-7757(02)00442-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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46
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Stiakakis E, Vlassopoulos D, Loppinet B, Roovers J, Meier G. Kinetic arrest of crowded soft spheres in solvents of varying quality. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 66:051804. [PMID: 12513513 DOI: 10.1103/physreve.66.051804] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2002] [Indexed: 05/24/2023]
Abstract
Crowded solutions of multiarm star polymers, representing model colloidal spheres with ultrasoft repulsive interactions, undergo a reversible gelation transition upon heating in solvents of intermediate quality (between good and Theta). This unusual phenomenon is due to the kinetic arrest of the swollen interpenetrating spheres at high temperatures, forming clusters, in analogy to the colloidal glass transition. In this work we demonstrate that the choice of the solvent has a dramatic effect on the gelation transition, because of the different degree of star swelling (at the same temperature) associated with the solvent quality. We construct a generic kinetic phase diagram for the gelation of different stars in different solvents (gelation temperature against effective volume fraction, phi) and propose a critical "soft sphere close packing" volume fraction phi(c) distinguishing the temperature-induced (for phi<phi(c)) from the concentration-induced (for phi>phi(c)) glass-like gelation. We conclude that appropriate selection of the solvent allows for manipulation of the sol-gel transition in such ultrasoft colloids.
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Affiliation(s)
- E Stiakakis
- FORTH, Institute of Electronic Structure and Laser, GR-71110 Heraklion, Crete, Greece
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47
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Martin C, Pignon F, Piau JM, Magnin A, Lindner P, Cabane B. Dissociation of thixotropic clay gels. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 66:021401. [PMID: 12241172 DOI: 10.1103/physreve.66.021401] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2000] [Revised: 02/14/2002] [Indexed: 05/23/2023]
Abstract
Laponite dispersions in water, at moderate ionic strength and high pH, are thixotropic: depending on previous history, they can be fluids or gels. The mechanisms of the fluid-gel and gel-fluid transitions have been examined through ionic analysis of the aqueous phase, static light, and small-angle neutron scattering, rheological experiments, and centrifugation. The results indicate that the particles attract each other in edge-to-face configurations. These attractions cause the particles to gather in microdomains, which subsequently associate to form very large fractal superaggregates, containing all the particles in the dispersion. A gel state is obtained when the network of connections is macroscopic. This network is destroyed by the application of sufficient strain, but it heals at rest. The addition of peptizers weakens the edge-to-face attractions, and makes the healing times much slower.
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Affiliation(s)
- Céline Martin
- Laboratoire de Rhéologie, Université Joseph Fourier, Grenoble I, Institut National Polytechnique de Grenoble, CNRS UMR 5520, Boîte Postale 53, 38041 Grenoble Cedex 9, France
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48
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Dickinson E, Matia Merino L. Effect of sugars on the rheological properties of acid caseinate-stabilized emulsion gels. Food Hydrocoll 2002. [DOI: 10.1016/s0268-005x(01)00105-9] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Sagis LM, Veerman C, Ganzevles R, Ramaekers M, Bolder SG, van der Linden E. Mesoscopic structure and viscoelastic properties of β-lactoglobulin gels at low pH and low ionic strength. Food Hydrocoll 2002. [DOI: 10.1016/s0268-005x(01)00084-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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50
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Segrè PN, Prasad V, Schofield AB, Weitz DA. Glasslike kinetic arrest at the colloidal-gelation transition. PHYSICAL REVIEW LETTERS 2001; 86:6042-6045. [PMID: 11415424 DOI: 10.1103/physrevlett.86.6042] [Citation(s) in RCA: 151] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2000] [Indexed: 05/23/2023]
Abstract
We show that gelation of weakly attractive colloids is remarkably similar to the colloidal glass transition. Like the glass transition, dynamic light scattering functions near gelation scale with scattering vector, and exhibits a two-step decay with a power-law divergence of the final decay time. Like the glass transition, static light scattering does not change upon gelation. These results suggest that, like the glass transition, gelation results from kinetic arrest due to crowding of clusters, and that both gelation and the glass transition are manifestations of a more general jamming transition.
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Affiliation(s)
- P N Segrè
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USa.
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