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Hasnain Sayed M, Sadgar AL, Bhanage BM, Jayaram RV. Particle shape anisotropy in pickering interfacial catalysis for Knoevenagel condensation. J Colloid Interface Sci 2024; 659:413-421. [PMID: 38183807 DOI: 10.1016/j.jcis.2023.12.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 12/15/2023] [Accepted: 12/20/2023] [Indexed: 01/08/2024]
Abstract
Dispersions of two immiscible liquids stabilized by solid particles are termed as Pickering emulsions. Stability of such emulsions is affected by various parameters such as amount of solid particle, method of emulsification, size, and shape of particles, etc. In this study, MgO samples prepared by different methods and characterized by XRD, FESEM, HRTEM, DLS, and CO2-TPD techniques were utilized for stabilizing o/w Pickering emulsions. The effect of particle shape on Pickering Interfacial Catalysis (PIC) for Knoevenagel condensation was investigated. It was found that in the case of rod and plate shaped particles, emulsion stability and catalytic activity were higher as compared to those obtained with other MgO samples prepared. The applicability of the MgO-PIC system is also successfully demonstrated for gram scale synthesis (85 % yield in 30 min). The MgO-PIC system was found to be reusable for at least five cycles without substantial loss in activity.
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Affiliation(s)
- Mohd Hasnain Sayed
- Physical Chemistry Lab, Department of Chemistry Institute of Chemical Technology, Mumbai-400019, India
| | - Amid L Sadgar
- Physical Chemistry Lab, Department of Chemistry Institute of Chemical Technology, Mumbai-400019, India
| | - Bhalchandra M Bhanage
- Physical Chemistry Lab, Department of Chemistry Institute of Chemical Technology, Mumbai-400019, India
| | - Radha V Jayaram
- Physical Chemistry Lab, Department of Chemistry Institute of Chemical Technology, Mumbai-400019, India.
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Wang J, Sun Y, Yu M, Lu X, Komarneni S, Yang C. Emulsions stabilized by highly hydrophilic TiO 2 nanoparticles via van der Waals attraction. J Colloid Interface Sci 2021; 589:378-387. [PMID: 33482535 DOI: 10.1016/j.jcis.2021.01.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 12/16/2020] [Accepted: 01/05/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS Highly hydrophilic nanoparticles are generally considered not suitable for stabilizing Pickering emulsions, since they could not be effectively wetted by the oil phase at the water-oil interface. However, highly hydrophilic nanoparticles with good dispersity are possibly absorbed and packed onto the surface of the oil droplets in water via the van der Waals attraction between the nanoparticles and the oil droplets. Hence, a novel "van der Waals emulsion" should be possible to be stabilized by highly hydrophilic nanoparticles. EXPERIMENTS Oil-in-water emulsions solely stabilized by pristine TiO2 nanoparticles (i.e., TiO2 without any modification or additives) were prepared. The emulsification behavior under varying pH value, oil fraction, particle content and temperature of the emulsion were explored. Composite wax-based beads which encapsulated chemical sunscreen and was coated by TiO2 nanoparticles, was also fabricated using the obtained emulsion as the templates. FINDINGS The emulsions displayed the highest stability near the isoelectric points of the TiO2 nanoparticles, which was attributed to the van der Waals attraction between TiO2 nanoparticles and oil droplets. Such mechanism was supported by a theoretical analysis based on calculation of the Hamaker constants and experimental evidences. Therefore, this work presents a simple, general and green method for preparing particle-stabilized emulsions.
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Affiliation(s)
- Jing Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Yajuan Sun
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
| | - Mingying Yu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Xihua Lu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Sridhar Komarneni
- Department of Ecosystem Science and Management and Materials Research Institute, 204 Energy and the Environment Laboratory, The Pennsylvania State University, University Park, PA 16802, USA.
| | - Cheng Yang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
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Luo J, Huang Z, Liu L, Wang H, Ruan G, Zhao C, Du F. Recent advances in separation applications of polymerized high internal phase emulsions. J Sep Sci 2020; 44:169-187. [PMID: 32845083 DOI: 10.1002/jssc.202000612] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 08/12/2020] [Accepted: 08/19/2020] [Indexed: 01/11/2023]
Abstract
Polymerized high internal phase emulsions as highly porous adsorption materials have received increasing attention and wide applications in separation science in recent years due to their remarkable merits such as highly interconnected porosity, high permeability, good thermal and chemical stability, and tailorable chemistry. In this review, we attempt to introduce some strategies to utilize polymerized high internal phase emulsions for separation science, and highlight the recent advances made in the applications of polymerized high internal phase emulsions for diverse separation of small organic molecules, carbon dioxide, metal ions, proteins, and other interesting targets. Potential challenges and future perspectives for polymerized high internal phase emulsion research in the field of separation science are also speculated at the end of this review.
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Affiliation(s)
- Jinhua Luo
- College of Biological and Environmental Engineering, Changsha University, Changsha, P. R. China
| | - Zhujun Huang
- College of Biological and Environmental Engineering, Changsha University, Changsha, P. R. China.,Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, P. R. China
| | - Linqi Liu
- College of Biological and Environmental Engineering, Changsha University, Changsha, P. R. China
| | - Haiyan Wang
- College of Biological and Environmental Engineering, Changsha University, Changsha, P. R. China
| | - Guihua Ruan
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, P. R. China
| | - Chenxi Zhao
- College of Biological and Environmental Engineering, Changsha University, Changsha, P. R. China
| | - Fuyou Du
- College of Biological and Environmental Engineering, Changsha University, Changsha, P. R. China.,Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, P. R. China
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Migliore N, Picchioni F, Raffa P. The effect of macromolecular structure on the rheology and surface properties of amphiphilic random polystyrene-r-poly(meth)acrylate copolymers prepared by RDRP. SOFT MATTER 2020; 16:2836-2846. [PMID: 32104866 DOI: 10.1039/d0sm00153h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this work rheological and surface properties of various random copolymers of styrene and sodium (meth)acrylate, prepared using reversible deactivation radical polymerization (RDRP), were studied. It is shown that the properties of these polymers in water solution, relevant for several applications, are affected by their chemical structure and molecular weight. Cryo-TEM images of their concentrated water solutions do not show the presence of nano-objects as micelles, however the existence of some aggregates seems to be confirmed by fluorescence measurements using pyrene as a hydrophobic probe and by surface tension measurements. Moreover, interesting results are displayed about the viscosity as well as the surface tension of these water polymer solutions, due probably to different interactions at the molecular level as suggested by fluorescence measurements.
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Affiliation(s)
- Nicola Migliore
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4 9747 AG, The Netherlands.
| | - Francesco Picchioni
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4 9747 AG, The Netherlands.
| | - Patrizio Raffa
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4 9747 AG, The Netherlands.
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Zhou T, Ding L, Che G, Jiang W, Sang L. Recent advances and trends of molecularly imprinted polymers for specific recognition in aqueous matrix: Preparation and application in sample pretreatment. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.02.028] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Liu Y, Ou H, Li S, You Q, Liu H, Liao G, Wang D. One-step preparation of polyimide-inlaid amine-rich porous organic block copolymer for efficient removal of chlorophenols from aqueous solution. J Environ Sci (China) 2019; 78:215-229. [PMID: 30665640 DOI: 10.1016/j.jes.2018.09.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/21/2018] [Accepted: 09/25/2018] [Indexed: 06/09/2023]
Abstract
A novel polyimide-inlaid amine-rich porous organic block copolymer (PI-b-ARPOP) was prepared via one-step polymerization by using different molar ratios of melamine (MA)/terephthalaldehyde (TA)/pyromellitic dianhydride (PMDA), at molar ratios of 4/3/1, 4/2/2 and 4/1/3. The copolymer contained both aminal groups belonging to ARPOP and imide groups belonging to PI, and the bonding styles of the monomers and growth orientations of the polymeric chains were diversiform, forming an excellent porous structure. Notably, MA/TA/PMDA (4/2/2) had a surface area and pore volume of 487.27 m2/g and 1.169 cm3/g, respectively. The adsorption performance of the materials towards 2,4-dichlorophenol (2,4-DCP) in ultra-pure water was systematically studied. The pH value of 7 was optimal in aqueous solution. Na+ and Cl- ions did not negatively affect the adsorption process, while humic acid (HA) slightly decreased the capacity. The equilibrium time was 40 sec, and the maximum adsorption capacity reached 282.49 mg/g at 298 K. The removal process was endothermic and spontaneous, and the copolymer could maintain its porous structure and consistent performance after regeneration by treatment with alkali. Moreover, to further assess the practical applicability of the material, the adsorption performance towards 2,4-DCP in river water was also investigated. This paper demonstrated that the PI-b-ARPOP can be an efficient and practical adsorbent to remove chlorophenols from aqueous solution.
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Affiliation(s)
- Yanyang Liu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Haijian Ou
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Shangqing Li
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Qingliang You
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China
| | - Huixian Liu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Guiying Liao
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Dongsheng Wang
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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