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Russell BA, Wynne K. A method for rheological measurements of air sensitive samples. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:025108. [PMID: 38376385 DOI: 10.1063/5.0169326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 01/21/2024] [Indexed: 02/21/2024]
Abstract
The rheology of air or moisture sensitive liquids, gels, and glasses requires complicated rheometer-in-glovebox laboratory setups. Here, we demonstrate the use of a heavier-than-air cover gas, sulfur hexafluoride, and the design of a cover gas container that can attach to the lower geometry plate of any rheometer to carry out rheology experiments on air-sensitive liquids and soft solids. Rheological measurements of air-reactive ionic liquid trimethylsulfonium bromide-AlCl3, moisture sensitive titanium(IV) propoxide, and glycerin demonstrate the effectiveness of the cover-gas method for loading samples on acquiring correct temperature dependent viscosity data of the sample in the absence of reaction products.
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Affiliation(s)
- Ben A Russell
- School of Chemistry, University of Glasgow, Glasgow, United Kingdom
| | - Klaas Wynne
- School of Chemistry, University of Glasgow, Glasgow, United Kingdom
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Vale M, Marques AC. Mechanistic Study of the Formation of Multicomponent Oxide Porous Microspheres (MICROSCAFS ®) by Cryo-Scanning Electron Microscopy. Gels 2023; 9:704. [PMID: 37754386 PMCID: PMC10529508 DOI: 10.3390/gels9090704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 08/19/2023] [Accepted: 08/29/2023] [Indexed: 09/28/2023] Open
Abstract
Multicomponent oxide microspheres with interconnected macroporosity (MICROSCAFS®) are new materials with great potential as support materials for photocatalysis, optimized for real life applications and for other uses that are still being explored. They are obtained from an adapted sol-gel process combined with phase separation phenomena that occur within the water droplets of an emulsion. We present here a methodology based on cryogenic scanning electron microscopy (cryo-SEM) that allows, with minimal specimen preparation, the direct and in situ visualization of 'wet' alkoxide-derived microstructures, for the mechanistic study of the complex process of MICROSCAFS® generation. It is simultaneously combined with energy dispersive X-ray spectroscopy (EDS) to visualize phase separation phenomena and study the chemical elemental composition at specific regions of the sample and reaction times.
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Chen Y, Yao M, Peng S, Fang Y, Wan L, Shang W, Xiang D, Zhang W. Development of protein-polyphenol particles to stabilize high internal phase Pickering emulsions by polyphenols' structure. Food Chem 2023; 428:136773. [PMID: 37423104 DOI: 10.1016/j.foodchem.2023.136773] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 05/07/2023] [Accepted: 06/29/2023] [Indexed: 07/11/2023]
Abstract
Protein-polyphenol colloidal particles are promising stabilizers for high internal phase Pickering emulsions (HIPPEs). However, the relationship between the structure of the polyphenols and its ability to stabilize HIPPEs has not been studied thus far. In this study, bovine serum albumin (BSA)-polyphenols (B-P) complexes were prepared, and their ability to stabilize HIPPEs was investigated. The polyphenols were bound to BSA via non-covalent interactions. Optically isomeric polyphenols formed similar bonds with BSA, whereas a greater number of trihydroxybenzoyl groups or hydroxyl groups in the dihydroxyphenyl moieties of polyphenols increased the B-P interactions. Polyphenols also reduced the interfacial tension and enhanced the wettability at the oil-water interface. The HIPPE stabilized by BSA-tannic acid complex exhibited the highest stability among the B-P complexes and resisted demixing and aggregation during centrifugation. This study promotes the potential applications of polyphenol-protein colloidal particles-stabilized HIPPEs in the food industry.
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Affiliation(s)
- Yang Chen
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China
| | - Mengying Yao
- Public Inspection and Testing Center of Gong'an County, Jingzhou 434300, China
| | - Su Peng
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China
| | - Yajing Fang
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China
| | - Liting Wan
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China
| | - Wenting Shang
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China
| | - Dong Xiang
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China
| | - Weimin Zhang
- Key Laboratory of Food Nutrition and Functional Food of Hainan Province, School of Food Science and Engineering, Hainan University, Haikou 570228, China; Key Laboratory of Tropical Fruits and Vegetables Quality and Safety for State Market Regulation, Hainan Institute for Food Control, Haikou 570228, China.
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Lorignon F, Gossard A, Medjouel S, Carboni M, Meyer D. Controlling polyHIPE Surface Properties by Tuning the Hydrophobicity of MOF Particles Stabilizing a Pickering Emulsion. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37318840 DOI: 10.1021/acsami.3c02987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Metal-organic frameworks (MOFs) show promise for the capture of greenhouse gases. To be used at a large scale in fixed-bed processes, their shaping under a hierarchical structure is mandatory and remains a major challenge, while keeping available their high specific surface area. For that purpose, we propose herein an original method based on the stabilization of a paraffin-in-water Pickering emulsion by a fluorinated Zr MOF (UiO-66(F4)) with polyHIPEs (polymers from high internal phase emulsions) strategy consisting of the polymerization of monomers in the external phase. After polymerization of the continuous phase and elimination of the paraffin, a hierarchically structured monolith is obtained with the UiO-66(F4) particles embedded in the polymer wall and covering the internal porosity. To avoid the pore blocking induced by the embedment of the MOF particles, our strategy was to modify their hydrophilic/hydrophobic balance with a controlled adsorption of hydrophobic molecules (perfluorooctanoic acid, PFOA) on the UiO-66(F4) particles. This will induce a displacement of the MOF position at the paraffin-water interface in the emulsion and then make the particles less embedded into the polymer wall. This leads to the formation of hierarchically structured monoliths integrating UiO-66(F4) particles with higher accessibility, maintaining their original properties and allowing their application in fixed-bed processes. This strategy was demonstrated by N2 and CO2 capture, and we believe that such original strategy could be applied to other MOF materials.
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Affiliation(s)
- Fabrice Lorignon
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Marcoule, P 17171, Bagnols-sur-Cèze Cedex, France
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, P 17171, Bagnols-sur-Cèze Cedex, France
| | - Alban Gossard
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, P 17171, Bagnols-sur-Cèze Cedex, France
| | - Sabrine Medjouel
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Marcoule, P 17171, Bagnols-sur-Cèze Cedex, France
| | - Michaël Carboni
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Marcoule, P 17171, Bagnols-sur-Cèze Cedex, France
| | - Daniel Meyer
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Marcoule, P 17171, Bagnols-sur-Cèze Cedex, France
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Shahnawaz N, Sherazi TA, Li R, Hao F, Yan F, Liu Y. Pickering emulsions for the polymerization of ε-caprolactone in continuous flow process. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Robust pH-switchable pickering emulsions stabilized solely by organic Rosin-based particles with adjustable wettability. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118751] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Effects of the zeolite concentration on the microstructure of high internal phase emulsions stabilized by surfactant-coated zeolite particles. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126853] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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