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Cong S, Lan T, Wang Y, Zu L, Dong S, Zhang Z, Xu J. Titanium Dioxide and Calcium Sulfate Whiskers Are Used for the Preparation of High Performance Polypropylene and Reduce White Pollution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:11056-11066. [PMID: 38739782 DOI: 10.1021/acs.langmuir.4c00547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
The anti-aging agent TiO2-polyacrylonitrile (PAN) and the mechanical strengthening agent CSW-PAN were prepared by radical polymerization using rutile nano-titanium dioxide (TiO2) and anhydrous calcium sulfate whisker (CSW) as raw materials. The structures of TiO2-PAN and CSW-PAN were characterized using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Simultaneously, the mechanical properties, aging properties, and thermal stability of TiO2-PAN/CSW-PAN/polypropylene (PP) composites were studied, and the results showed that the surfaces of nano-titanium dioxide and calcium sulfate whiskers were successfully grafted with acrylonitrile. Owing to the introduction of new elements, such as acrylonitrile, nano-titanium dioxide and calcium sulfate whiskers have anti-aging properties. In comparison of the impact strength and tensile strength of TiO2-PAN/PP and TiO2-PAN/CSW-PAN/PP before aging, it can be proven that adding CSW-PAN can significantly enhance the mechanical properties of TiO2-PAN/CSW-PAN/PP. After 1000 h of aging, the tensile strength of the ternary composite TiO2-PAN/CSW-PAN/PP was 19.88 MPa when the addition amount of TiO2-PAN and CSW-PAN was 3%. Moreover, the impact strength of the ternary composite material TiO2-PAN/CSW-PAN/PP after 1000 h of aging is even better than that of non-aging pure PP materials, proving that the service life of improved PP products is extended, unnecessary waste and environmental pollution can be relieved, and the needs of specific engineering fields can be met.
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Affiliation(s)
- Shanshan Cong
- School of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
- College of Materials Science and Engineering, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
| | - Tianyu Lan
- College of Materials Science and Engineering, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
- Northeast Petroleum University Applied Technology Research Institute, Northeast Petroleum University, Daqing, Heilongjiang 163318, People's Republic of China
- Colege of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polmeric Composition Material, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
| | - Yazhen Wang
- Colege of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polmeric Composition Material, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
| | - Liwu Zu
- Colege of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polmeric Composition Material, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
| | - Shaobo Dong
- Colege of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polmeric Composition Material, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
| | - Zuoyuan Zhang
- Colege of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polmeric Composition Material, Qiqihar University, Qiqihar, Heilongjiang 161006, People's Republic of China
| | - Jiahang Xu
- Engineering Geological Technology Group, Underground Operation Branch, Daqing Oilfeld Company, Daqing, Heilongjiang 163318, People's Republic of China
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Gong H, Zi Y, Kan G, Li L, Shi C, Wang X, Zhong J. Preparation of food-grade EDC/NHS-crosslinked gelatin nanoparticles and their application for Pickering emulsion stabilization. Food Chem 2024; 436:137700. [PMID: 37839116 DOI: 10.1016/j.foodchem.2023.137700] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/20/2023] [Accepted: 10/07/2023] [Indexed: 10/17/2023]
Abstract
Herein, a safe desolvation and crosslinking method was developed to prepare food-grade bovine bone gelatin (BBG) nanoparticles for Pickering emulsion stabilization. The nanoparticle-like structures were formed by adjusting pH 9.0 and adding ethanol, and then stable nanoparticles were formed by using N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDC) and N-hydroxysuccinimide (NHS) as crosslinker. Compared with other pH (2.5, 5.0, 7.0, and 12.0), pH 9.0 was the appropriate pH to prepare BBG nanoparticles. Individual nanoparticles (6.50 nm in height), oligomeric nanoparticles (13.42-22.52 nm in height), and polymeric nanoparticles (obvious liquid-precipitate separation) were formed at EDC·HCl/NHS concentrations of 6, 9-12, and 15-20 mg/mL, respectively. The oligomeric nanoparticles induced the highest emulsion creaming stability. The emulsion creaming ability increased with the increase of BBG nanoparticle concentrations. Low NaCl concentration (e.g., 100 mmol/L) could increase the emulsion creaming stability. Finally, 4 °C was the best storage temperature for fish oil-loaded Pickering emulsions.
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Affiliation(s)
- Huan Gong
- National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Ye Zi
- National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Guangyi Kan
- National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Li Li
- National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Cuiping Shi
- Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Xichang Wang
- National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China.
| | - Jian Zhong
- National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China; Marine Biomedical Science and Technology Innovation Platform of Lingang Special Area, Shanghai 201306, China.
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Lai L, Zhang T, Zheng C. Study of foam drainage agent based on g-C3N4 nanosheets reinforced stabilization. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Keane RK, Hong W, He W, Teale S, Bancroft R, Dinsmore AD. Adsorption of Hydrophilic Silica Nanoparticles at Oil-Water Interfaces with Reversible Emulsion Stabilization by Ion Partitioning. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2821-2831. [PMID: 35188775 DOI: 10.1021/acs.langmuir.1c02919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Adsorption of particles at oil-water interfaces is the basis of Pickering emulsions, which are common in nature and industry. For hydrophilic anionic particles, electrostatic repulsion and the absence of wetting inhibit spontaneous adsorption and limit the scope of materials that can be used in emulsion-based applications. Here, we explore how adding ions that selectively partition in the two fluid phases changes the interfacial electric potential and drives particle adsorption. We add oil-soluble tetrabutyl ammonium perchlorate (TBAP) to the nonpolar phase and Ludox silica nanoparticles or silica microparticles to the aqueous phase. We find a well-defined threshold TBAP concentration, above which emulsions are stable for months. This threshold increases with the particle concentration and with the oil's dielectric constant. Adding NaClO4 salt to water increases the threshold and causes spontaneous particle desorption and droplet coalescence even without agitation. The results are explained by a model based on the Poisson-Boltzmann theory, which predicts that the perchlorate anions (ClO4-) migrate into the water phase and leave behind a net positive charge in the oil. Our results show how a large class of inorganic hydrophilic, anionic nanoparticles can be used to stabilize emulsions in a reversible and stimulus-responsive way, without surface modifications.
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Affiliation(s)
- Robert K Keane
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Wei Hong
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Wei He
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Sam Teale
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Robbie Bancroft
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Anthony D Dinsmore
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
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Da C, Chen X, Zhu J, Alzobaidi S, Garg G, Johnston KP. Elastic gas/water interface for highly stable foams with modified anionic silica nanoparticles and a like-charged surfactant. J Colloid Interface Sci 2022; 608:1401-1413. [PMID: 34749135 DOI: 10.1016/j.jcis.2021.10.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 10/10/2021] [Accepted: 10/11/2021] [Indexed: 10/20/2022]
Abstract
HYPOTHESIS Surface active anionic nanoparticles (NPs) with strategically designed covalent ligands may be combined with a liked-charged surfactant to form a highly elastic gas-water interface leading to highly stable gas/water foams. EXPERIMENTS The colloidal stability of the NPs was determined by dynamic light scattering, and the surface elastic dilational modulus E' of the interface by sinusoidal oscillation of a pendant droplet at 0.1 Hz, which was superimposed on large-amplitude compression-expansion cycles. The foam stability was measured with optical microscopy of the bubble size distribution and from the macroscopic foam height. FINDINGS The NPs played the key role the formation of a highly elastic air-water interface with a high E' despite a surfactant level well above the critical micelle concentration. Unlike the case for most previous studies, the NP amphiphilicity was essentially independent of the surfactant given the very low adsorption of the surfactant on the like-charged NP surfaces. With high E' values, both coalescence and coarsening were reduced leading to highly foam up to 80 °C. However, the surfactant facilitated foam generation at much lower shear rates than with NPs alone. The tuning of NP surfaces with ligands for colloidal stability in brine and simultaneously high amphiphilicity at the gas-water interface, over a wide range in surfactant concentration, is of broad interest for enabling the design of highly stable foams.
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Affiliation(s)
- Chang Da
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, TX, USA
| | - Xiongyu Chen
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, TX, USA
| | - Jingyi Zhu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, TX, USA
| | - Shehab Alzobaidi
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, TX, USA
| | - Gaurav Garg
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, TX, USA
| | - Keith P Johnston
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, TX, USA.
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Guzmán E, Abelenda-Núñez I, Maestro A, Ortega F, Santamaria A, Rubio RG. Particle-laden fluid/fluid interfaces: physico-chemical foundations. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:333001. [PMID: 34102618 DOI: 10.1088/1361-648x/ac0938] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 06/08/2021] [Indexed: 06/12/2023]
Abstract
Particle-laden fluid/fluid interfaces are ubiquitous in academia and industry, which has fostered extensive research efforts trying to disentangle the physico-chemical bases underlying the trapping of particles to fluid/fluid interfaces as well as the properties of the obtained layers. The understanding of such aspects is essential for exploiting the ability of particles on the stabilization of fluid/fluid interface for the fabrication of novel interface-dominated devices, ranging from traditional Pickering emulsions to more advanced reconfigurable devices. This review tries to provide a general perspective of the physico-chemical aspects associated with the stabilization of interfaces by colloidal particles, mainly chemical isotropic spherical colloids. Furthermore, some aspects related to the exploitation of particle-laden fluid/fluid interfaces on the stabilization of emulsions and foams will be also highlighted. It is expected that this review can be used for researchers and technologist as an initial approach to the study of particle-laden fluid layers.
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Affiliation(s)
- Eduardo Guzmán
- Departamento de Química Física, Universidad Complutense de Madrid, Madrid, Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid, Spain
| | - Irene Abelenda-Núñez
- Departamento de Química Física, Universidad Complutense de Madrid, Madrid, Spain
| | | | - Francisco Ortega
- Departamento de Química Física, Universidad Complutense de Madrid, Madrid, Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid, Spain
| | - Andreas Santamaria
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid, Spain
- Institut Laue-Langevin, Grenoble, France
| | - Ramón G Rubio
- Departamento de Química Física, Universidad Complutense de Madrid, Madrid, Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid, Spain
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7
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Da C, Zhang X, Alzobaidi S, Hu D, Wu P, Johnston KP. Tuning Surface Chemistry and Ionic Strength to Control Nanoparticle Adsorption and Elastic Dilational Modulus at Air-Brine Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5795-5809. [PMID: 33944565 DOI: 10.1021/acs.langmuir.1c00112] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The relationship between the interfacial rheology of nanoparticle (NP) laden air-brine interfaces and NP adsorption and interparticle interactions is not well understood, particularly as a function of the surface chemistry and salinity. Herein, a nonionic ether diol on the surface of silica NPs provides steric stabilization in bulk brine and at the air-brine interface, whereas a second smaller underlying hydrophobic ligand raises the hydrophobicity to promote NP adsorption. The level of NPs adsorption at steady state is sufficient to produce an interface with a relatively strong elastic dilational modulus E' = dγ/d ln A. However, the interface is ductile with a relatively slow change in E' as the interfacial area is varied over a wide range during compression and expansion. In contrast, for silica NPs stabilized with only a single hydrophobic ligand, the interfaces are often more fragile and may fracture with small changes in area. The presence of concentrated divalent cations improves E' and ductility by screening electrostatic dipolar repulsion and strengthening the attractive forces between nanoparticles. The ability to tune the interfacial rheology with NP surface chemistry is of great interest for designing more stable gas/brine foams.
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Affiliation(s)
- Chang Da
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, Texas 78712, United States
| | - Xuan Zhang
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, Texas 78712, United States
- College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
| | - Shehab Alzobaidi
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, Texas 78712, United States
| | - Dongdong Hu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, Texas 78712, United States
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Pingkeng Wu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, Texas 78712, United States
| | - Keith P Johnston
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas, Austin, Texas 78712, United States
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Smits J, Giri RP, Shen C, Mendonça D, Murphy B, Huber P, Rezwan K, Maas M. Synergistic and Competitive Adsorption of Hydrophilic Nanoparticles and Oil-Soluble Surfactants at the Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5659-5672. [PMID: 33905659 DOI: 10.1021/acs.langmuir.1c00559] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Fundamental insights into the interplay and self-assembly of nanoparticles and surface-active agents at the liquid-liquid interface play a pivotal role in understanding the ubiquitous colloidal systems present in our natural surroundings, including foods and aquatic life, and in the industry for emulsion stabilization, drug delivery, or enhanced oil recovery. Moreover, well-controlled model systems for mixed interfacial adsorption of nanoparticles and surfactants allow unprecedented insights into nonideal or contaminated particle-stabilized emulsions. Here, we investigate such a model system composed of hydrophilic, negatively, and positively charged silica nanoparticles and the oil-soluble cationic lipid octadecyl amine with in situ synchrotron-based X-ray reflectometry, which is analyzed and discussed jointly with dynamic interfacial tensiometry. Our results indicate that negatively charged silica nanoparticles only adsorb if the oil-water interface is covered with the positively charged lipid, indicating synergistic adsorption. Conversely, the positively charged nanoparticles readily adsorb on their own, but compete with octadecyl amine and reversibly desorb with increasing concentrations of the lipid. These results further indicate that with competitive adsorption, an electrostatic exclusion zone exists around the adsorbed particles. This prevents the adsorption of lipid molecules in this area, leading to a decreased surface excess concentration of surfactants and unexpectedly high interfacial tension.
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Affiliation(s)
- Joeri Smits
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, D-28359 Bremen, Germany
| | - Rajendra P Giri
- Institute of Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany
| | - Chen Shen
- DESY Photon Science, Notkestraße 85, D-22607 Hamburg, Germany
| | - Diogo Mendonça
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, D-28359 Bremen, Germany
- Department of Mechanical Engineering, Federal University of Santa Catarina, 88040-900 Florianopolis, Brazil
| | - Bridget Murphy
- Institute of Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany
- Ruprecht-Haensel Laboratory, Kiel University, 24118 Kiel, Germany
| | - Patrick Huber
- DESY Photon Science, Notkestraße 85, D-22607 Hamburg, Germany
- Institute for Materials and X-Ray Physics, Hamburg University of Technology, Eißendorfer Straße 42, 21073 Hamburg, Germany
- Center for Hybrid Nanostructures ChyN, Hamburg University, Luruper Chaussee 149, 22607 Hamburg, Germany
| | - Kurosch Rezwan
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, D-28359 Bremen, Germany
- MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstraße 1, D-28359 Bremen, Germany
| | - Michael Maas
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, D-28359 Bremen, Germany
- MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstraße 1, D-28359 Bremen, Germany
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9
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Alzobaidi S, Da C, Wu P, Zhang X, Rabat-Torki NJ, Harris JM, Hackbarth JE, Lu C, Hu D, Johnston KP. Tuning Nanoparticle Surface Chemistry and Interfacial Properties for Highly Stable Nitrogen-In-Brine Foams. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5408-5423. [PMID: 33881323 DOI: 10.1021/acs.langmuir.1c00832] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The design of surface chemistries on nanoparticles (NPs) to stabilize gas/brine foams with concentrated electrolytes, especially with divalent ions, has been elusive. Herein, we tune the surface of 20 nm silica NPs by grafting a hydrophilic and a hydrophobic ligand to achieve two seemingly contradictory goals of colloidal stability in brine and high NP adsorption to yield a viscoelastic gas-brine interface. Highly stable nitrogen/water (N2/brine) foams are formed with CaCl2 concentrations up to 2% from 25 to 90 °C. The viscoelastic gas-brine interface retards drainage of the lamellae, and the high dilational elasticity arrests coarsening (Ostwald ripening) with no observable change in foam bubble size over 48 h. The ability to design NP-laden viscoelastic interfaces for highly stable foams, even with high divalent ion concentrations, is of fundamental mechanistic interest for a broad range of foam applications and in particular foams for CO2 sequestration and enhanced oil recovery.
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Affiliation(s)
- Shehab Alzobaidi
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Chang Da
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Pingkeng Wu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Xuan Zhang
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Nava J Rabat-Torki
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Justin M Harris
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Jamie E Hackbarth
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Congwen Lu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Dongdong Hu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
| | - Keith P Johnston
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, Texas 78712-1139, United States
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10
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Behrens SH. Oil-coated bubbles in particle suspensions, capillary foams, and related opportunities in colloidal multiphase systems. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2020.08.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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11
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Ji X, Wang X, Zhang Y, Zang D. Interfacial viscoelasticity and jamming of colloidal particles at fluid-fluid interfaces: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2020; 83:126601. [PMID: 32998118 DOI: 10.1088/1361-6633/abbcd8] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Colloidal particles can be adsorbed at fluid-fluid interfaces, a phenomenon frequently observed in particle-stabilized foams, Pickering emulsions, and bijels. Particles adsorbed at interfaces exhibit unique physical and chemical behaviors, which affect the mechanical properties of the interface. Therefore, interfacial colloidal particles are of interest in terms of both fundamental and applied research. In this paper, we review studies on the adsorption of colloidal particles at fluid-fluid interfaces, from both thermodynamic and mechanical points of view, and discuss the differences as compared with surfactants and polymers. The unique particle interactions induced by the interfaces as well as the particle dynamics including lateral diffusion and contact line relaxation will be presented. We focus on the rearrangement of the particles and the resultant interfacial viscoelasticity. Particular emphasis will be given to the effects of particle shape, size, and surface hydrophobicity on the interfacial particle assembly and the mechanical properties of the obtained particle layer. We will also summarize recent advances in interfacial jamming behavior caused by adsorption of particles at interfaces. The buckling and cracking behavior of particle layers will be discussed from a mechanical perspective. Finally, we suggest several potential directions for future research in this area.
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Affiliation(s)
- Xiaoliang Ji
- Soft Matter & Complex Fluids Group, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, People's Republic of China
| | - Xiaolu Wang
- Institute of Welding and Surface Engineering Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, People's Republic of China
| | - Yongjian Zhang
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi'an University, Xi'an 710065, People's Republic of China
| | - Duyang Zang
- Soft Matter & Complex Fluids Group, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, People's Republic of China
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12
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Pal N, Mandal A. Enhanced oil recovery performance of gemini surfactant-stabilized nanoemulsions functionalized with partially hydrolyzed polymer/silica nanoparticles. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2020.115887] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Mears R, Muntz I, Thijssen JHJ. Surface pressure of liquid interfaces laden with micron-sized particles. SOFT MATTER 2020; 16:9347-9356. [PMID: 32936200 DOI: 10.1039/d0sm01229g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We consider the surface pressure of a colloid-laden liquid interface. As micron-sized particles of suitable wettability can be irreversibly bound to the liquid interface on experimental timescales, we use the canonical ensemble to derive an expression for the surface pressure of a colloid-laden interface. We use this expression to show that adsorption of particles with only hard-core interactions has a negligible effect on surface pressures from typical Langmuir-trough measurements. Moreover, we show that Langmuir-trough measurements cannot be used to extract typical interparticle potentials. Finally, in the case of relatively weakly interacting sterically stabilized particles at a liquid interface, we argue that the dependence of measured surface pressure on surface fraction can be explained by particle coordination number at low to intermediate particle surface fractions. At high surface fractions, where the particles are jammed and cannot easily rearrange, we argue that contact-line sliding and/or deformations of the liquid interface at the length scale of the particles might play a pivotal role.
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Affiliation(s)
- Rudi Mears
- SUPA School of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3FD, Scotland, UK.
| | - Iain Muntz
- SUPA School of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3FD, Scotland, UK.
| | - Job H J Thijssen
- SUPA School of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3FD, Scotland, UK.
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Park H, Lim S, Yang J, Kwak C, Kim J, Kim J, Choi SS, Kim CB, Lee J. A Systematic Investigation on the Properties of Silica Nanoparticles "Multipoint"-Grafted with Poly(2-acrylamido-2-methylpropanesulfonate- co-acrylic Acid) in Extreme Salinity Brines and Brine-Oil Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3174-3183. [PMID: 32101011 DOI: 10.1021/acs.langmuir.9b03692] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Nanoparticles (NPs) may have great potential for various subsurface applications, including oil and gas recovery, reservoir imaging, and environmental remediation. One of the important challenges for these downhole applications is to achieve colloidal stability in subsurface media at high salinity and high temperature. It has been previously shown that several functional NPs "multipoint"-grafted with anionic poly(2-acrylamido-2-methyl-1-propanesulfonate-co-acrylic acid; AMPS-co-AA) exhibited remarkable colloidal stabilities in specific environments mimicking the harsh subsurface aquatic media, such as the American Petroleum Institute (API) brine. However, many important properties of such particles, other than the colloidal stabilities, must be studied in a more systematic fashion for a wide range of salt concentrations (Cs). Herein, we investigate various properties of the silica (SiO2) NPs multipoint-grafted with poly(AMPS-co-AA), SiO2-g-poly(AMPS-co-AA), in NaCl and CaCl2 solutions across a range of salinities. The brush behavior of the grafted random copolymers was investigated in both salt solutions from salt-free conditions up to extreme salinities. The particles displayed brine-oil interfacial activity with increasing Cs, stabilizing oil-in-brine emulsions as Pickering emulsifiers. A high internal phase emulsion (HIPE) with an internal oil phase of up to 80 vol % could be formed in CaCl2 solutions at high Cs, which exhibited gel-like behaviors.
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Affiliation(s)
- Hyunsu Park
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Sehyeong Lim
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Jeewon Yang
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Chaesu Kwak
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Jieun Kim
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Jieun Kim
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Shin Sik Choi
- Department of Food and Nutrition, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
| | - Chae Bin Kim
- Department of Polymer Science and Engineering, Pusan National University, 2 Busandaehak-ro, Geumjeong-gu, Busan 46241, Korea
| | - Joohyung Lee
- Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 17058, Korea
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Investigation on the adsorption mechanism and model of didodecyldimethylammonium bromide on ZnO nanoparticles at the oil/water interface. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Toor A, Forth J, Bochner de Araujo S, Merola MC, Jiang Y, Liu X, Chai Y, Hou H, Ashby PD, Fuller GG, Russell TP. Mechanical Properties of Solidifying Assemblies of Nanoparticle Surfactants at the Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13340-13350. [PMID: 31536356 DOI: 10.1021/acs.langmuir.9b01575] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The effect of polymer surfactant structure and concentration on the self-assembly, mechanical properties, and solidification of nanoparticle surfactants (NPSs) at the oil-water interface was studied. The surface tension of the oil-water interface was found to depend strongly on the choice of the polymer surfactant used to assemble the NPSs, with polymer surfactants bearing multiple polar groups being the most effective at reducing interfacial tension and driving the NPS assembly. By contrast, only small variations in the shear modulus of the system were observed, suggesting that it is determined largely by particle density. In the presence of polymer surfactants bearing multiple functional groups, NPS assemblies on pendant drop surfaces were observed to spontaneously solidify above a critical polymer surfactant concentration. Interfacial solidification accelerated rapidly as polymer surfactant concentration was increased. On long timescales after solidification, pendant drop interfaces were observed to spontaneously wrinkle at sufficiently low surface tensions (approximately 5 mN m-1). Interfacial shear rheology of the NPS assemblies was elastic-dominated, with the shear modulus ranging from 0.1 to 1 N m-1, comparable to values obtained for nanoparticle monolayers elsewhere. Our work paves the way for the development of designer, multicomponent oil-water interfaces with well-defined mechanical, structural, and functional properties.
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Affiliation(s)
- Anju Toor
- Department of Mechanical Engineering , University of California , 6141 Etcheverry Hall , Berkeley , California 94720 , United States
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
| | - Joe Forth
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
| | - Simone Bochner de Araujo
- Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States
| | - Maria Consiglia Merola
- Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States
| | - Yufeng Jiang
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
- Department of Applied Science and Technology , University of California , Berkeley , California 94720 , United States
| | - Xubo Liu
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , China
| | - Yu Chai
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
- Department of Applied Science and Technology , University of California , Berkeley , California 94720 , United States
- The Molecular Foundry , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
| | - Honghao Hou
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
| | - Paul D Ashby
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
- The Molecular Foundry , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
| | - Gerald G Fuller
- Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States
| | - Thomas P Russell
- Materials Sciences Division , Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , United States
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , China
- Polymer Science and Engineering Department , University of Massachusetts , 120 Governors Drive, Conte Center for Polymer Research , Amherst , Massachusetts 01003 , United States
- Advanced Institute for Materials Research (AIMR) , Tohoku University , 2-1-1 Katahira , Aoba, Sendai 980-8577 , Japan
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Wu W, Liu X, Chen SL, Yuan Q, Gan W. Particle adsorption at the oil-water interface studied with second harmonic generation. SOFT MATTER 2019; 15:7672-7677. [PMID: 31490517 DOI: 10.1039/c9sm01125k] [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
In this work, energetics of the adsorption of polystyrene nanoparticles at the hexadecane-water interface was studied with second harmonic generation. The adsorption of positively and negatively charged nanoparticles at the oil-water interface induced a decrease and an increase in the SHG emission from the interface, respectively. This change in the SHG emission, which is similar to that upon the adsorption of ionic surfactants at the hexadecane-water interface, which we reported previously, was then used as an indicator of particle adsorption at the interface. The adsorption free energies of the particles with a diameter of 20 nm at the hexadecane-water interface were found to be -14.7 ± 0.5 kcal mol-1, -14.4 ± 0.4 kcal mol-1 and -15.1 ± 0.3 kcal mol-1 for the amidine, carboxyl and sulfate latex beads, respectively. This result implied that the van der Waals interaction between the oil phase and the polystyrene particles is capable of driving negatively charged particles to the negatively charged hexadecane-water interface. The principle of like dissolves like played a major role in the adsorption of polystyrene particles from the aqueous phase to the oil-water interface. The origin of the SHG emission from the oil-water interface was also discussed.
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Affiliation(s)
- Wei Wu
- Department of Chemistry, Xinjiang Normal University, Urumqi, 830054, Xinjiang, China
| | - Xinxin Liu
- State Key Laboratory of Advanced Welding and Joining, and School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
| | - Shun-Li Chen
- State Key Laboratory of Advanced Welding and Joining, and School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
| | - Qunhui Yuan
- State Key Laboratory of Advanced Welding and Joining, and School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China
| | - Wei Gan
- State Key Laboratory of Advanced Welding and Joining, and School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
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Sadeh P, Najafipour I, Gholami M. Adsorption kinetics of halloysite nanotube and modified halloysite at the Palm oil-water interface and Pickering emulsion stabilized by halloysite nanotube and modified halloysite nanotube. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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19
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Smits J, Vieira F, Bisswurn B, Rezwan K, Maas M. Reversible Adsorption of Nanoparticles at Surfactant-Laden Liquid-Liquid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11089-11098. [PMID: 31368712 DOI: 10.1021/acs.langmuir.9b01568] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, we show that hydrophilic nanoparticles can readily desorb from liquid-liquid interfaces in the presence of surfactants that do not change the wettability of the particles. Our observations are based on a simple theoretical approach to assess the number of adsorbed particles at the surfactant-laden liquid-liquid interface. We test this approach by studying the interfacial self-assembly of equally charged particles and lipids dissolved in separate immiscible phases. Hence, we investigate the interfacial adsorption of aminated silica particles (80 nm) and octadecylamine to the decane/water interface by interfacial tension measurements, which are supplemented by interfacial rheology of the adsorbed interfacial films, scanning electron microscopy images of Langmuir-Blodgett films, and measurements of the three-phase contact angle of the particle surface in the presence of surfactants. The measurements show that particles adsorb at the surfactant-laden interface at all investigated surfactant concentrations and compete with the surfactants for interfacial coverage. Additionally, the wettability of the hydrophilic particles does not change in the presence of the lipids, except for the highest investigated lipid concentration. Comparing the adsorption energies of one particle and of the lipids as a function of the particle contact angle provides an estimate of the tendency for interfacial adsorption of particles from which the particle coverage can be assessed. Based on these findings, equally charged particles and lipids show a competitive behavior at the interface determined by the bulk surfactant concentration and the attachment energies of the particles at the interface. This leads to a simple mechanistic model demonstrating that particles can readily desorb from the interface due to direct displacement by surfactants, which are loosely adsorbed at the oil-facing particle side. This mechanism critically lowers the otherwise high interfacial energy barrier against particle desorption, which otherwise would lead to virtually irreversible particle attachment at the interface.
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Affiliation(s)
- Joeri Smits
- Advanced Ceramics , University of Bremen , Am Biologischen Garten 2 , D-28359 Bremen , Germany
| | - Felipi Vieira
- Advanced Ceramics , University of Bremen , Am Biologischen Garten 2 , D-28359 Bremen , Germany
- Department of Mechanical Engineering , Federal University of Santa Catarina , 88040-900 Florianópolis , Brazil
| | - Bianca Bisswurn
- Advanced Ceramics , University of Bremen , Am Biologischen Garten 2 , D-28359 Bremen , Germany
- Department of Mechanical Engineering , Federal University of Santa Catarina , 88040-900 Florianópolis , Brazil
| | - Kurosch Rezwan
- Advanced Ceramics , University of Bremen , Am Biologischen Garten 2 , D-28359 Bremen , Germany
- MAPEX Center for Materials and Processes , University of Bremen , 28359 Bremen , Germany
| | - Michael Maas
- Advanced Ceramics , University of Bremen , Am Biologischen Garten 2 , D-28359 Bremen , Germany
- MAPEX Center for Materials and Processes , University of Bremen , 28359 Bremen , Germany
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20
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Solvent extraction kinetics of Ag(I) with methyl ketonic p-tert-octylcalix[4]arene in the modified Lewis cell technique. J INCL PHENOM MACRO 2019. [DOI: 10.1007/s10847-018-0807-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Llamas S, Ponce Torres A, Liggieri L, Santini E, Ravera F. Surface properties of binary TiO2 - SiO2 nanoparticle dispersions relevant for foams stabilization. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Forth J, Kim PY, Xie G, Liu X, Helms BA, Russell TP. Building Reconfigurable Devices Using Complex Liquid-Fluid Interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806370. [PMID: 30828869 DOI: 10.1002/adma.201806370] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/12/2018] [Indexed: 06/09/2023]
Abstract
Liquid-fluid interfaces provide a platform both for structuring liquids into complex shapes and assembling dimensionally confined, functional nanomaterials. Historically, attention in this area has focused on simple emulsions and foams, in which surface-active materials such as surfactants or colloids stabilize structures against coalescence and alter the mechanical properties of the interface. In recent decades, however, a growing body of work has begun to demonstrate the full potential of the assembly of nanomaterials at liquid-fluid interfaces to generate functionally advanced, biomimetic systems. Here, a broad overview is given, from fundamentals to applications, of the use of liquid-fluid interfaces to generate complex, all-liquid devices with a myriad of potential applications.
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Affiliation(s)
- Joe Forth
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
| | - Paul Y Kim
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
| | - Ganhua Xie
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Conte Center for Polymer Research, Amherst, MA, 01003, USA
| | - Xubo Liu
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Brett A Helms
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Thomas P Russell
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Conte Center for Polymer Research, Amherst, MA, 01003, USA
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
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Ballard N, Law AD, Bon SAF. Colloidal particles at fluid interfaces: behaviour of isolated particles. SOFT MATTER 2019; 15:1186-1199. [PMID: 30601564 DOI: 10.1039/c8sm02048e] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The adsorption of colloidal particles to fluid interfaces is a phenomenon that is of interest to multiple disciplines across the physical and biological sciences. In this review we provide an entry level discussion of our current understanding on the physical principles involved and experimental observations of the adsorption of a single isolated particle to a liquid-liquid interface. We explore the effects that a variation of the morphology and surface chemistry of a particle can have on its ability to adhere to a liquid interface, from a thermodynamic as well as a kinetic perspective, and the impact of adsorption behaviour on potential applications. Finally, we discuss recent developments in the measurement of the interfacial behaviour of nanoparticles and highlight open questions for future research.
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Affiliation(s)
- Nicholas Ballard
- POLYMAT - University of the Basque Country (UPV/EHU), Centro Joxe Mari Korta, Avenida de Tolosa 72, 20018, Donostia-San Sebastian, Spain.
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Lee JG, Larive LL, Valsaraj KT, Bharti B. Binding of Lignin Nanoparticles at Oil-Water Interfaces: An Ecofriendly Alternative to Oil Spill Recovery. ACS APPLIED MATERIALS & INTERFACES 2018; 10:43282-43289. [PMID: 30452221 DOI: 10.1021/acsami.8b17748] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Synthetic amphiphiles used for managing large-scale oil spills have a toxic impact on the environment and marine life. Developing new oil spill recovery technologies is critical to minimize the environmental and ecological impact of such disasters. Here, we show that a mixture of lignin nanoparticles and 1-pentanol forms a biocompatible alternative to nondegradable, synthetic amphiphiles used for oil spill recovery. The pentanol in the mixture generates initial Marangoni flow and confines the spilled oil into a thick slick on the surface of water. While the alcohol solubilizes, lignin nanoparticles irreversibly adsorb onto the oil-water interface. We find that the lignin nanoparticle adsorption to the oil-water interface is governed by a combination of electrostatic, van der Waals, and hydrophobic interactions between the particles and the interface. These interactions, combined with interparticle electrostatic repulsion between nanoparticles adsorbed at the oil-water interface, drive the formation of a submonolayer. The submonolayer transforms into a film of jammed nanoparticles due to compressive stress acting on the interface upon the solubilization of pentanol. This interfacial layer of lignin nanoparticles restricts oil from respreading and locks the oil in its confined state. The herded state of the oil with the interfacial layer of nanoparticles facilitates safe removal of the spilled oil using mechanical methods. The study presents a new principle of using a mixture of heavy alcohol and biocompatible nanoparticles for oil herding applications, thus providing an ecofriendly alternative to oil spill recovery.
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Affiliation(s)
- Jin Gyun Lee
- Cain Department of Chemical Engineering , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - Luke L Larive
- Cain Department of Chemical Engineering , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - Kalliat T Valsaraj
- Cain Department of Chemical Engineering , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - Bhuvnesh Bharti
- Cain Department of Chemical Engineering , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
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Gong Y, Wang M, Zhang Z, He J. Microgel evolution at three-phase contact region and associated wettability alteration. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.08.076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Microgelation imparts emulsifying ability to surface-inactive polysaccharides-bottom-up vs top-down approaches. NPJ Sci Food 2018; 2:15. [PMID: 31304265 PMCID: PMC6550241 DOI: 10.1038/s41538-018-0023-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 07/08/2018] [Accepted: 07/18/2018] [Indexed: 11/19/2022] Open
Abstract
In order to impart emulsifying ability to gel-forming polysaccharides that have not been used as emulsifying agents, three kinds of polysaccharides, agar, curdlan, and gellan gum were converted to microgels by different gelation methods via the bottom-up and top-down approaches. We clearly demonstrated that agar and curdlan acquired the ability to emulsify an edible oil by microgel formation. Among the colloidal properties of microgel suspensions such as microstructure, particle size, zeta-potential, viscosity, and surface hydrophobicity, we pointed out the importance of particle size on the emulsifying ability of polysaccharide-based microgels. The creaming behavior of the microgel-stabilized emulsions depended on the polysaccharide types and microgel preparation methods. The emulsion stability against oil droplet coalescence was extremely high for agar and curdlan microgel-stabilized emulsions during storage in the static condition, whereas different stability was observed for both the emulsions, that is, the curdlan microgel-based ones were more resistant to dynamic forcible destabilization by centrifugation than the agar ones, which can be attributed to the surface hydrophobicity of the microgels. Polysaccharides are widely recognized as gelling agents while rarely used alone as emulsifying agents due to their surface inactiveness. Now Kentaro Matsumiya and coworkers from Kyoto University report the microgelated polysaccharide particles can emulsify soybean oil, forming so-called microgel-based Mickering emulsions. It was found that large microgels formed by agar and curdlan exhibited better emulsifying abilities compared to small gellan gum microgels, regardless of the preparation methods. The creaming behaviors varied with the changing polysaccharide types and microgel preparation methods. The static stability was quite high for all emulsions while their dynamic stability was different, which can be attributed to the surface hydrophobicity difference. It is noteworthy that the microgelation turned surface-inactive polysaccharides into effective emulsifying agents. The low-allergenic polysaccharide food emulsions might find usage practically soon.
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Kim JY, Morisada S, Kawakita H, Ohto K. Comparison of interfacial behavior and silver extraction kinetics with various types calix[4]arene derivatives at heterogeneous liquid-liquid interfaces. J Chromatogr A 2018; 1558:107-114. [DOI: 10.1016/j.chroma.2018.04.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 04/02/2018] [Accepted: 04/04/2018] [Indexed: 11/24/2022]
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28
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Wu D, Honciuc A. Contrasting Mechanisms of Spontaneous Adsorption at Liquid-Liquid Interfaces of Nanoparticles Constituted of and Grafted with pH-Responsive Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6170-6182. [PMID: 29730929 DOI: 10.1021/acs.langmuir.8b00877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Elucidating the mechanisms responsible for spontaneous adsorption of nanoparticles (NPs) at interfaces is important for their application as emulsifiers, bubble stabilizers, or foaming agents. In order to investigate the key factors that control the spontaneous adsorption of NPs at liquid-liquid interfaces, we synthesized seven different types of NPs from pH-responsive polymers poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA) and poly(2-dimethylamino)ethyl methacrylate) (PDMAEMA) via surfactant-free emulsion polymerization or via "grafting from" polystyrene (PS) NPs. The dynamic interfacial tension (IFT) measurements at the toluene-water (Tol-H2O) interface reveal that when PDEAEMA and PDMAEMA are grafted from the surface of PS NPs the solubility of the grafted pH-responsive polymers in toluene is the key factor determining the NPs' interfacial adsorption. Under acidic conditions (pH < 6.0), PDEAEMA and PDMAEMA are protonated and show no solubility in toluene, and as a result, the grafted NPs do not adsorb at the Tol-H2O interface. Oppositely, under basic conditions (pH > 7.0), PDMAEMA dissolves in toluene and therefore the PDMAEMA-grafted NPs can adsorb at the Tol-H2O interface. Interestingly, when NPs are constituted of PDEAEMA, they can adsorb spontaneously at the Tol-H2O interface under acidic conditions (pH < 6.0) but not under basic conditions (pH > 7.0). In this case, the key factor determining the NPs' spontaneous adsorption at the Tol-H2O interface is the degree of softness of the NPs rather than the solubility of PDEAEMA in toluene. Furthermore, we found that the adsorption of NPs constituted of PDEAEMA- (pH 2.0-6.0) and PDMAEMA-grafted PS NPs (pH 7.0-10.0) at the Tol-H2O interface is a combination of diffusion-controlled and energy-barrier-controlled. The opposite trends observed for the interfacial attachment Δ E and activation energies Ea for the "constituted of" and "grafted from" NPs with pH suggest an opposite mechanisms of adsorption at the Tol-H2O interface. Finally, the synthesized NPs prove to be effective emulsifiers, where the phase of the Pickering emulsions can be changed dynamically by pH adjustment.
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Affiliation(s)
- Dalin Wu
- Institute of Chemistry and Biotechnology , Zurich University of Applied Sciences , Einsiedlerstrasse 31 , 8820 Waedenswil , Switzerland
| | - Andrei Honciuc
- Institute of Chemistry and Biotechnology , Zurich University of Applied Sciences , Einsiedlerstrasse 31 , 8820 Waedenswil , Switzerland
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Hua X, Frechette J, Bevan MA. Nanoparticle adsorption dynamics at fluid interfaces. SOFT MATTER 2018; 14:3818-3828. [PMID: 29718061 DOI: 10.1039/c8sm00273h] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the dynamic adsorption of nanoparticles (NPs) at fluid interfaces is important for stabilizing emulsions and for the preparation of 2D NP-based materials. Here we show that the Ward-Tordai equations commonly employed to describe the dynamics of surfactant adsorption at a fluid interface combined with a Frumkin adsorption isotherm can be employed to model the diffusion-limited adsorption of NPs onto a fluid interface. In contrast to surfactants, an additional wetting equation of state (EOS) must be incorporated to characterize the dynamic interfacial tension during the adsorption of NPs to the oil-water interface. Our results show agreement between the model and experiments with NP area fractions <0.3. Slower dynamics are observed at larger area fractions, which are speculated to arise from polydispersity or re-organization at the interface. We show the model can be extended to the competitive adsorption between the NPs and a surface active species.
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Affiliation(s)
- Xiaoqing Hua
- Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
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30
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Hua X, Bevan MA, Frechette J. Competitive Adsorption between Nanoparticles and Surface Active Ions for the Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4830-4842. [PMID: 29631392 DOI: 10.1021/acs.langmuir.8b00053] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Nanoparticles (NPs) can add functionality (e.g., catalytic, optical, rheological) to an oil-water interface. Adsorption of ∼10 nm NPs can be reversible; however, the mechanisms for adsorption and its effects on surface pressure remain poorly understood. Here we demonstrate how the competitive reversible adsorption of NPs and surfactants at fluid interfaces can lead to independent control of both the adsorbed amount and surface pressure. In contrast to prior work, both species investigated (NPs and surfactants) interact reversibly with the interface and without the surface active species binding to NPs. Independent measurements of the adsorption and surface pressure isotherms allow determination of the equation of state (EOS) of the interface under conditions where the NPs and surfactants are both in dynamic equilibrium with the bulk phase. The adsorption and surface pressure measurements are performed with gold NPs of two different sizes (5 and 10 nm), at two pH values, and across a wide concentration range of surfactant (tetrapentylammonium, TPeA+) and NPs. We show that free surface active ions compete with NPs for the interface and give rise to larger surface pressures upon the adsorption of NPs. Through a competitive adsorption model, we decouple the contributions of NPs wetting at the interface and their surface activity on the measured surface pressure. We also demonstrate reversible control of adsorbed amount via changes in the surfactant concentration or the aqueous phase pH.
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Affiliation(s)
- Xiaoqing Hua
- Chemical and Biomolecular Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Michael A Bevan
- Chemical and Biomolecular Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Joelle Frechette
- Chemical and Biomolecular Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
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31
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Forth J, Liu X, Hasnain J, Toor A, Miszta K, Shi S, Geissler PL, Emrick T, Helms BA, Russell TP. Reconfigurable Printed Liquids. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707603. [PMID: 29573293 DOI: 10.1002/adma.201707603] [Citation(s) in RCA: 116] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 01/31/2018] [Indexed: 06/08/2023]
Abstract
Liquids lack the spatial order required for advanced functionality. Interfacial assemblies of colloids, however, can be used to shape liquids into complex, 3D objects, simultaneously forming 2D layers with novel magnetic, plasmonic, or structural properties. Fully exploiting all-liquid systems that are structured by their interfaces would create a new class of biomimetic, reconfigurable, and responsive materials. Here, printed constructs of water in oil are presented. Both form and function are given to the system by the assembly and jamming of nanoparticle surfactants, formed from the interfacial interaction of nanoparticles and amphiphilic polymers that bear complementary functional groups. These yield dissipative constructs that exhibit a compartmentalized response to chemical cues. Potential applications include biphasic reaction vessels, liquid electronics, novel media for the encapsulation of cells and active matter, and dynamic constructs that both alter, and are altered by, their external environment.
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Affiliation(s)
- Joe Forth
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
| | - Xubo Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jaffar Hasnain
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Anju Toor
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Department of Mechanical Engineering, University of California, Berkeley, CA, 94720, USA
| | - Karol Miszta
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Shaowei Shi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Phillip L Geissler
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Todd Emrick
- Polymer Science and Engineering Department, Conte Center for Polymer Research, University of Massachusetts, 120 Governors Drive, Amherst, MA, 01003, USA
| | - Brett A Helms
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Thomas P Russell
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, Beijing University of Chemical Technology, Beijing, 100029, China
- Polymer Science and Engineering Department, Conte Center for Polymer Research, University of Massachusetts, 120 Governors Drive, Amherst, MA, 01003, USA
- WPI - Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
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32
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Wang X, Zhang Z, Torsæter O, He J. Atomistic insights into the nanofluid transport through an ultra-confined capillary. Phys Chem Chem Phys 2018; 20:4831-4839. [PMID: 29383352 DOI: 10.1039/c7cp08140e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanofluid or nanoparticle (NP) transport in confined channels is of great importance for many biological and industrial processes. In this study, molecular dynamics simulation has been employed to investigate the spontaneous two-phase displacement process in an ultra-confined capillary controlled by the surface wettability of NPs. The results clearly show that the presence of NPs modulates the fluid-fluid meniscus and hinders the displacement process compared with the NP-free case. From the perspective of motion behavior, hydrophilic NPs disperse in the water phase or adsorb on the capillary, while hydrophobic and mixed-wet NPs are mainly distributed in the fluid phase. The NPs dispersed into fluids tend to increase the viscosity of the fluids, while the adsorbed NPs contribute to the wettability alteration of the solid capillary. Via capillary number calculations, it is uncovered that the viscosity increase of fluids is responsible for the hindered spontaneous displacement process by hydrophobic and mixed NPs. The wettability alteration of the capillary induced by adsorbed NPs dominates the enhanced displacement in the case of hydrophilic NPs. Our findings provide guidance for modifying the rate of capillary filling and reveal the microscopic mechanism transporting NPs into porous media, which is significant to the design of NPs for target applications.
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Affiliation(s)
- Xiao Wang
- NTNU Nanomechanical Lab, Department of Structural Engineering, Faculty of Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.
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33
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Wu D, Binks BP, Honciuc A. Modeling the Interfacial Energy of Surfactant-Free Amphiphilic Janus Nanoparticles from Phase Inversion in Pickering Emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1225-1233. [PMID: 28946742 DOI: 10.1021/acs.langmuir.7b02331] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Determining the interfacial energy of nanoparticles is very challenging via traditional methods that first require measuring the contact angle of several liquids of a sessile drop on pellets or capillary rise in powder beds. In this work, we propose an alternative way to model the interfacial energy of nanoparticles directly from emulsion phase inversion data in Pickering emulsions. This could establish itself as a universal and facile way to determine the polarity of nanoparticles relative to a series of standard particles without the need to measure contact angles. Pickering emulsions of several oils in water were generated with a series of snowman-like Janus nanoparticles (JNPs), whose polarity gradually increased with the size of the more polar lobe. Depending on the oil to water ratio and the JNPs lobe size, oil-in-water (o/w) or water-in-oil (w/o) Pickering emulsions were obtained and the affinity of the JNPs to either water or oil can be inferred from the evolution of the emulsion phase inversion curves with these parameters. We further demonstrate that by adopting a simple model for the work of adhesion of JNPs with the water and oil phases, one can quantitatively calculate the relative interfacial energy change of the JNPs with the liquid. In addition, a knowledge of the interfacial energy of nanoparticles is useful for employing these in suspension polymerization to create surface nanostructured materials. The o/w and w/o Pickering emulsions obtained from monomers, such as styrene, could be polymerized, resulting in colloidosomes or hollow-like materials. The hollow materials exhibited a rather high volume storage capacity for the aqueous phase for extended periods of time, which could be released upon microwaving, making them ideal for use in long-term storage applications of various water-soluble actives.
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Affiliation(s)
- Dalin Wu
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences , Einsiedlerstrasse 31, 8820 Waedenswil, Switzerland
| | - Bernard P Binks
- School of Mathematics and Physical Sciences, University of Hull , Hull HU6 7RX, U.K
| | - Andrei Honciuc
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences , Einsiedlerstrasse 31, 8820 Waedenswil, Switzerland
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34
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Kirby SM, Anna SL, Walker LM. Effect of surfactant tail length and ionic strength on the interfacial properties of nanoparticle-surfactant complexes. SOFT MATTER 2017; 14:112-123. [PMID: 29214259 DOI: 10.1039/c7sm01806a] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mixed nanoparticle-surfactant systems are effective foam stabilizing agents, but the lack of colloidal stability of the bulk dispersions makes interfacial characterization challenging. This study investigates the adsorption of CnTAB/SiO2 complexes at air/water interfaces through surface tension and interfacial rheology measurements. The effects of surfactant tail length, ionic strength, and interfacial processing on the surface properties are measured utilizing a bulk reservoir exchange methodology to avoid bulk destabilization. The surfactant structure controls the surface tension of the system, but has minimal impact on particle surface coverage or interfacial mechanics. Once adsorbed, nanoparticles remain pinned at the surface, while the surfactant is able to desorb upon bulk exchange with deionized water. Particle packing on the interface governs the interfacial mechanics, which can be modified by increasing the ionic strength of the bulk solution. Fully rigid interfaces can be generated at low particle coverages by controlling the ionic strength and interfacial processing. These findings contribute to the understanding of mixed particle-surfactant systems and inform formulation and process design to achieve the desired interfacial mechanical properties.
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Affiliation(s)
- Stephanie M Kirby
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
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35
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Cunningham VJ, Giakoumatos EC, Ireland PM, Mable CJ, Armes SP, Wanless EJ. Giant Pickering Droplets: Effect of Nanoparticle Size and Morphology on Stability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7669-7679. [PMID: 28712294 DOI: 10.1021/acs.langmuir.7b01383] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The interaction between a pair of millimeter-sized nanoparticle-stabilized n-dodecane droplets was analyzed using a high-speed video camera. The droplets were grown in the presence of either poly(glycerol monomethacrylate)-poly(benzyl methacrylate) (PGMA-PBzMA) diblock copolymer spheres or poly(glycerol monomethacrylate)-poly(2-hydroxypropyl methacrylate)-poly(benzyl methacrylate) (PGMA-PHPMA-PBzMA) triblock copolymer worms prepared by polymerization-induced self-assembly. The effect of nanoparticle morphology on droplet coalescence was analyzed by comparing 22 nm spheres to highly anisotropic worms with a mean worm width of 26 nm and comparable particle contact angle. Both morphologies lowered the interfacial tension, providing direct evidence for nanoparticle adsorption at the oil-water interface. At 0.03 w/v % copolymer, an aging time of at least 90 s was required to stabilize the n-dodecane droplets in the presence of the worms, whereas no aging was required to produce stable droplets when using the spheres, suggesting faster diffusion of the latter to the surface of the oil droplets. The enhanced stability of the sphere-coated droplets is consistent with the higher capillary pressure in this system as the planar interfaces approach. However, the more strongly adsorbing worms ultimately also confer stability. At lower copolymer concentrations (≤0.01 w/v %), worm adsorption promoted droplet stability, whereas the spheres were unable to stabilize droplets even after longer aging times. The effect of mean sphere diameter on droplet stability was also assessed while maintaining an approximately constant particle contact angle. Small spheres of either 22 or 41 nm stabilized n-dodecane droplets, whereas larger spheres of either 60 or 91 nm were unable to prevent coalescence when the two droplets were brought into contact. These observations are consistent with the greater capillary pressure stabilizing the oil-water interfaces coated with the smaller spheres. Addition of an oil-soluble polymeric diisocyanate cross-linker to either the 60 or the 91 nm spheres produced highly stable colloidosomes, thus confirming adsorption of these nanoparticles.
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Affiliation(s)
- Victoria J Cunningham
- Department of Chemistry, University of Sheffield , Brook Hill, Sheffield, South Yorkshire S3 7HF, U.K
| | - Emma C Giakoumatos
- Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle , Callaghan, New South Wales 2308, Australia
| | - Peter M Ireland
- Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle , Callaghan, New South Wales 2308, Australia
| | - Charlotte J Mable
- Department of Chemistry, University of Sheffield , Brook Hill, Sheffield, South Yorkshire S3 7HF, U.K
| | - Steven P Armes
- Department of Chemistry, University of Sheffield , Brook Hill, Sheffield, South Yorkshire S3 7HF, U.K
| | - Erica J Wanless
- Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle , Callaghan, New South Wales 2308, Australia
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