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Meng T, Zhao Z, Li G, Li J, Yan H. Molecular Dynamics Study of Silica Nanoparticles and CO 2-Switchable Surfactants at an Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11283-11293. [PMID: 37524083 DOI: 10.1021/acs.langmuir.3c00949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Adsorbing CO2-sensitive surfactants on the surface of nanoparticles is an important strategy for preparing stimuli-responsive Pickering emulsions. However, the microscopic mechanisms are still limited, owing to a lack of intuitive understanding at the molecular level on the interactions between nanoparticle and switchable surfactants at the oil-water interface. We employed the molecular dynamics (MD) simulations to explore the mechanism behind the reversible emulsification/demulsification of a Pickering emulsion stabilized by silica nanoparticles (NPs) and CO2-switchable surfactants, named N-(3-(dimethylamino)propyl)alkyl amide (CPMA). MD results show that the protonated surfactant CPMAH+ has strong hydrophilicity, forming an adsorption layer at the oil-water interface. The ionic surfactants can be tightly adsorbed on NP surface through electrostatic interactions. Thus, the formed colloid particle has both hydrophobic and hydrophilic properties, which is a key factor in stabilizing emulsion. When CPMAH+ molecules were deprotonated to CPMA, the hydration activity of the headgroups reduced greatly, inducing a mixture with oil molecules. There are still a certain number of CPMA molecules residing at the oil-water interface due to the hydrophilic amine groups. The results from repeated simulations show that NP can either stay in the water phase or locate at the interface. Even NP was finally adsorbed on the interface and combined with CPMA or oil molecules, the adsorption configuration of CPMA on the NP surface was essentially different from that of CPMAH+. The potential of mean force confirmed that the combination between NP and CPMA is quite unstable due to the disappearance of electrostatic attraction. Different binding configurations and stability between NP and CPMA or CPMAH+ were the fundamental reason for the reversible emulsification/demulsification of Pickering emulsion.
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Affiliation(s)
- Tong Meng
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Zhen Zhao
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Guangyong Li
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Jun Li
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Hui Yan
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, China
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2
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Vu-Minh T, Dao-Hong A, Bui-Bich P, Nguyen-Tran-Thanh N, Tran-Manh C, Tran-Phan-Thuy L, Doan-Thi H, Luc-Huy H, Pham-Van H. Evaporation-driven assembly of colloidal nanoparticles into clusters: A dissipative particle dynamics study. Phys Rev E 2023; 108:014602. [PMID: 37583241 DOI: 10.1103/physreve.108.014602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 06/20/2023] [Indexed: 08/17/2023]
Abstract
In this work we consider a simulation strategy for assembling Janus nanoparticles in oil-in-water emulsion droplets by evaporation based on the dissipative particle dynamics method. Our simple method reproduces all the observed cluster configurations that have been explored experimentally. In addition, the kinetic process of cluster formation is systematically investigated. We observe a structural transition from spherical packings to minimal second-moment configurations via visual inspection and a simple angle parameter. We reveal that the critical volume at which the transition occurs is a cubic function of the number of particles, N. Our approach also allows us to anticipate higher-order clusters, overcoming the limitations of the standard methods in the literature. Similarly to small N values, we find that for each N in the range of 16-39, all final clusters have a unique configuration.
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Affiliation(s)
- Tu Vu-Minh
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Anh Dao-Hong
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Phuong Bui-Bich
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Nam Nguyen-Tran-Thanh
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Cuong Tran-Manh
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Linh Tran-Phan-Thuy
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Hien Doan-Thi
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Hoang Luc-Huy
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Hai Pham-Van
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
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3
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Phan A, Stamatakis M, Koh CA, Striolo A. Microscopic insights on clathrate hydrate growth from non-equilibrium molecular dynamics simulations. J Colloid Interface Sci 2023; 649:185-193. [PMID: 37348338 DOI: 10.1016/j.jcis.2023.06.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 05/03/2023] [Accepted: 06/06/2023] [Indexed: 06/24/2023]
Abstract
Clathrate hydrates form and grow at interfaces. Understanding the relevant molecular processes is crucial for developing hydrate-based technologies. Many computational studies focus on hydrate growth within the aqueous phase using the 'direct coexistence method', which is limited in its ability to investigate hydrate film growth at hydrocarbon-water interfaces. To overcome this shortcoming, a new simulation setup is presented here, which allows us to study the growth of a methane hydrate nucleus in a system where oil-water, hydrate-water, and hydrate-oil interfaces are all simultaneously present, thereby mimicking experimental setups. Using this setup, hydrate growth is studied here under the influence of two additives, a polyvinylcaprolactam oligomer and sodium dodecyl sulfate, at varying concentrations. Our results confirm that hydrate films grow along the oil-water interface, in general agreement with visual experimental observations; growth, albeit slower, also occurs at the hydrate-water interface, the interface most often interrogated via simulations. The results obtained demonstrate that the additives present within curved interfaces control the solubility of methane in the aqueous phase, which correlates with hydrate growth rate. Building on our simulation insights, we suggest that by combining data for the potential of mean force profile for methane transport across the oil-water interface and for the average free energy required to perturb a flat interface, it is possible to predict the performance of additives used to control hydrate growth. These insights could be helpful to achieve optimal methane storage in hydrates, one of many applications which are attracting significant fundamental and applied interests.
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Affiliation(s)
- Anh Phan
- School of Chemistry and Chemical Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Michail Stamatakis
- Department of Chemical Engineering, University College London, London WC1E 7JE, UK
| | - Carolyn A Koh
- Center for Hydrate Research, Chemical & Biological Engineering Department, Colorado School of Mines, Golden, CO 80401, United States
| | - Alberto Striolo
- Department of Chemical Engineering, University College London, London WC1E 7JE, UK; School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK 73019, United States.
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4
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Hybrid Nanoparticles at Fluid-Fluid Interfaces: Insight from Theory and Simulation. Int J Mol Sci 2023; 24:ijms24054564. [PMID: 36901995 PMCID: PMC10003740 DOI: 10.3390/ijms24054564] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 03/02/2023] Open
Abstract
Hybrid nanoparticles that combine special properties of their different parts have numerous applications in electronics, optics, catalysis, medicine, and many others. Of the currently produced particles, Janus particles and ligand-tethered (hairy) particles are of particular interest both from a practical and purely cognitive point of view. Understanding their behavior at fluid interfaces is important to many fields because particle-laden interfaces are ubiquitous in nature and industry. We provide a review of the literature, focusing on theoretical studies of hybrid particles at fluid-fluid interfaces. Our goal is to give a link between simple phenomenological models and advanced molecular simulations. We analyze the adsorption of individual Janus particles and hairy particles at the interfaces. Then, their interfacial assembly is also discussed. The simple equations for the attachment energy of various Janus particles are presented. We discuss how such parameters as the particle size, the particle shape, the relative sizes of different patches, and the amphiphilicity affect particle adsorption. This is essential for taking advantage of the particle capacity to stabilize interfaces. Representative examples of molecular simulations were presented. We show that the simple models surprisingly well reproduce experimental and simulation data. In the case of hairy particles, we concentrate on the effects of reconfiguration of the polymer brushes at the interface. This review is expected to provide a general perspective on the subject and may be helpful to many researchers and technologists working with particle-laden layers.
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Hussain KA, Chen C, Haggerty R, Schubert M, Li Y. Fundamental Mechanisms and Factors Associated with Nanoparticle-Assisted Enhanced Oil Recovery. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Kazi Albab Hussain
- Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska68588, United States
| | - Cheng Chen
- Department of Civil, Environmental and Ocean Engineering, Stevens Institute of Technology, Hoboken, New Jersey07030, United States
| | - Ryan Haggerty
- Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska68588, United States
| | - Mathias Schubert
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska68588, United States
| | - Yusong Li
- Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska68588, United States
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Liu S, Zhang H, Yuan S. Hydrophilic Silica Nanoparticles in O/W Emulsion: Insights from Molecular Dynamics Simulation. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238407. [PMID: 36500501 PMCID: PMC9740303 DOI: 10.3390/molecules27238407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 11/27/2022] [Accepted: 11/29/2022] [Indexed: 12/05/2022]
Abstract
Previous studies have been carried out on the effect of silica nanoparticles (SNPs) on the stability of oil-water emulsions. However, the combining configuration of SNPs and oil droplets at the molecular level and the effect of SNP content on the coalescence behavior of oil droplets cannot be obtained through experiments. In this paper, molecular dynamics (MD) simulation was performed to investigate the adsorption configuration of hydrophilic SNPs in an O/W emulsion system, and the effect of adsorption of SNPs on coalescence of oil droplets. The simulation results showed: (i) SNPs adsorbed on the surface of oil droplets, and excessive SNPs self-aggregated and connected by hydrogen bonds. (ii) Partially hydrophilic asphaltene and resin molecules formed adsorption configurations with SNPs, which changed the distribution of oil droplet components. Furthermore, compared with hydrophobic asphaltene, the hydrophilic asphaltene was easier to combine with SNPs. (iii) SNPs would extend the oil droplet coalescence time, and the π-π stacking structures were formed between asphaltene and asphaltene or resin molecules to enhance the connection between oil droplets during the oil droplet contact process. (iv) Enough SNPs tightly wrapped around the oil droplet, similar to the formation of a rigid film on the surface of an oil droplet, which hindered the contact and coalescence of components between oil droplets.
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Affiliation(s)
- Shasha Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
- School of Chemistry and Chemical Engineering, Qilu Normal University, Jinan 250100, China
| | - Hengming Zhang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Shiling Yuan
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
- Correspondence:
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Narayanan Nair AK, Che Ruslan MFA, Cui R, Sun S. An Overview of the Oil+Brine Two-Phase System in the Presence of Carbon Dioxide, Methane, and Their Mixture. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Affiliation(s)
- Arun Kumar Narayanan Nair
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Mohd Fuad Anwari Che Ruslan
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Ronghao Cui
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Shuyu Sun
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
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8
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Zen A, Bui T, Bao Le TT, Tay WJ, Chellappah K, Collins IR, Rickman RD, Striolo A, Michaelides A. Long-Range Ionic and Short-Range Hydration Effects Govern Strongly Anisotropic Clay Nanoparticle Interactions. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:8143-8151. [PMID: 35592734 PMCID: PMC9109138 DOI: 10.1021/acs.jpcc.2c01306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/14/2022] [Indexed: 06/15/2023]
Abstract
The aggregation of clay particles in aqueous solution is a ubiquitous everyday process of broad environmental and technological importance. However, it is poorly understood at the all-important atomistic level since it depends on a complex and dynamic interplay of solvent-mediated electrostatic, hydrogen bonding, and dispersion interactions. With this in mind, we have performed an extensive set of classical molecular dynamics simulations (included enhanced sampling simulations) on the interactions between model kaolinite nanoparticles in pure and salty water. Our simulations reveal highly anisotropic behavior, in which the interaction between the nanoparticles varies from attractive to repulsive depending on the relative orientation of the nanoparticles. Detailed analysis reveals that at large separation (>1.5 nm), this interaction is dominated by electrostatic effects, whereas at smaller separations, the nature of the water hydration structure becomes critical. This study highlights an incredible richness in how clay nanoparticles interact, which should be accounted for in, for example, coarse-grained models of clay nanoparticle aggregation.
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Affiliation(s)
- Andrea Zen
- Dipartimento
di Fisica Ettore Pancini, Università
di Napoli Federico II, Monte S. Angelo, I-80126 Napoli, Italy
- Department
of Earth Sciences, University College London, Gower Street, London WC1E 6BT, U.K.
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, U.K.
| | - Tai Bui
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, U.K.
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E
6BT, U.K.
| | - Tran Thi Bao Le
- Department
of Chemical Engineering, University College
London, WC1E 7JE London, U.K.
| | - Weparn J. Tay
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
| | - Kuhan Chellappah
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
| | - Ian R. Collins
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
| | | | - Alberto Striolo
- Department
of Chemical Engineering, University College
London, WC1E 7JE London, U.K.
- School
of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Angelos Michaelides
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, U.K.
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E
6BT, U.K.
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
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9
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Smits J, Prasad Giri R, Shen C, Mendonça D, Murphy B, Huber P, Rezwan K, Maas M. Assessment of nanoparticle immersion depth at liquid interfaces from chemically equivalent macroscopic surfaces. J Colloid Interface Sci 2022; 611:670-683. [PMID: 34974227 DOI: 10.1016/j.jcis.2021.12.113] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 12/14/2021] [Accepted: 12/18/2021] [Indexed: 01/22/2023]
Abstract
HYPOTHESIS We test whether the wettability of nanoparticles (NPs) straddling at an air/water surface or oil/water interface can be extrapolated from sessile drop-derived macroscopic contact angles (mCAs) on planar substrates, assuming that both the nanoparticles and the macroscopic substrates are chemically equivalent and feature the same electrokinetic potential. EXPERIMENTS Pure silica (SiO2) and amino-terminated silica (APTES-SiO2) NPs are compared to macroscopic surfaces with extremely low roughness (root mean square [RMS] roughness ≤ 2 nm) or a roughness determined by a close-packed layer of NPs (RMS roughness ∼ 35 nm). Equivalence of the surface chemistry is assessed by comparing the electrokinetic potentials of the NPs via electrophoretic light scattering and of the macroscopic substrates via streaming current analysis. The wettability of the macroscopic substrates is obtained from advancing (ACAs) and receding contact angles (RCAs) and in situ synchrotron X-ray reflectivity (XRR) provided by the NP wettability at the liquid interfaces. FINDINGS Generally, the RCA on smooth surfaces provides a good estimate of NP wetting properties. However, mCAs alone cannot predict adsorption barriers that prevent NP segregation to the interface, as is the case with the pure SiO2 nanoparticles. This strategy greatly facilitates assessing the wetting properties of NPs for applications such as emulsion formulation, flotation, or water remediation.
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Affiliation(s)
- Joeri Smits
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen D-28359, Germany.
| | - Rajendra Prasad Giri
- Institute of Experimental and Applied Physics, Kiel University, Kiel D-24098, Germany.
| | - Chen Shen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, Hamburg D-22607, Germany.
| | - Diogo Mendonça
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen D-28359, Germany; Department of Mechanical Engineering, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil.
| | - Bridget Murphy
- Institute of Experimental and Applied Physics, Kiel University, Kiel D-24098, Germany; Ruprecht-Haensel Laboratory, Kiel University, Kiel 24118, Germany.
| | - Patrick Huber
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, Hamburg D-22607, Germany; Hamburg University of Technology, Institute for Materials and X-Ray Physics, Eißendorfer Straße 42, Hamburg 21073, Germany; Hamburg University, Center for Hybrid Nanostructures ChyN, Luruper Chaussee 149, Hamburg 22607, Germany.
| | - Kurosch Rezwan
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen D-28359, Germany; MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstraße 1, Bremen D-28359, Germany.
| | - Michael Maas
- Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen D-28359, Germany; MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstraße 1, Bremen D-28359, Germany.
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Dedovets D, Li Q, Leclercq L, Nardello‐Rataj V, Leng J, Zhao S, Pera‐Titus M. Multiphase Microreactors Based on Liquid–Liquid and Gas–Liquid Dispersions Stabilized by Colloidal Catalytic Particles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202107537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dmytro Dedovets
- Eco-Efficient Products and Processes Laboratory (E2P2L) UMI 3464 CNRS-Solvay 3966 Jin Du Road, Xin Zhuang Ind Zone 201108 Shanghai China
- Laboratoire du Futur (LOF) UMR 5258, CNRS-Solvay-Universite Bordeaux 1 178 Av Dr Albert Schweitzer 33608 Pessac Cedex France
| | - Qingyuan Li
- Eco-Efficient Products and Processes Laboratory (E2P2L) UMI 3464 CNRS-Solvay 3966 Jin Du Road, Xin Zhuang Ind Zone 201108 Shanghai China
| | - Loïc Leclercq
- Univ Lille CNRS Centrale Lille Univ Artois UMR 8181 UCCS F-59000 Lille France
| | | | - Jacques Leng
- Laboratoire du Futur (LOF) UMR 5258, CNRS-Solvay-Universite Bordeaux 1 178 Av Dr Albert Schweitzer 33608 Pessac Cedex France
| | - Shuangliang Zhao
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University 530004 Nanning China
| | - Marc Pera‐Titus
- Eco-Efficient Products and Processes Laboratory (E2P2L) UMI 3464 CNRS-Solvay 3966 Jin Du Road, Xin Zhuang Ind Zone 201108 Shanghai China
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT UK
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11
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Koroleva MY, Yurtov EV. Pickering emulsions: properties, structure, using as colloidosomes and stimuli-responsive emulsions. RUSSIAN CHEMICAL REVIEWS 2022. [DOI: 10.1070/rcr5024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Surface morphology effects on clathrate hydrate wettability. J Colloid Interface Sci 2021; 611:421-431. [PMID: 34968961 DOI: 10.1016/j.jcis.2021.12.083] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/08/2021] [Accepted: 12/13/2021] [Indexed: 11/23/2022]
Abstract
HYPOTHESIS Clathrate hydrates preferentially form at interfaces; hence, wetting properties play an important role in their formation, growth, and agglomeration. Experimental evidence suggests that the hydrate preparation process can strongly affect contact angle measurements, leading to the different results reported in the literature. These differences hamper technological progress. We hypothesize that changes in hydrate surface morphologies are responsible for the wide variation of contact angles reported in the literature. EXPERIMENTS Experimental testing of our hypothesis is problematic due to the preparation history of hydrates on their surface properties, and the difficulties in advanced surface characterization. Thus, we employ molecular dynamics simulations, which allow us to systematically change the interfacial features and the system composition. Implementing advanced algorithms, we quantify fundamental thermodynamic properties to validate our observations. FINDINGS We achieve excellent agreement with experimental observations for both atomically smooth and rough hydrate surfaces. Our results suggest that contact line pinning forces, enhanced by surface heterogeneity, are accountable for altering water contact angles, thus explaining the differences among reported experimental data. Our analysis and molecular level insights help interpret adhesion force measurements and yield a better understanding of the agglomeration between hydrate particles, providing a microscopic tool for advancing flow assurance applications.
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13
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Bui T, Frampton H, Huang S, Collins IR, Striolo A, Michaelides A. Water/oil interfacial tension reduction - an interfacial entropy driven process. Phys Chem Chem Phys 2021; 23:25075-25085. [PMID: 34738605 DOI: 10.1039/d1cp03971g] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interfacial tension (IFT) of a fluid-fluid interface plays an important role in a wide range of applications and processes. When low IFT is desired, surface active compounds (e.g. surfactants) can be added to the system. Numerous attempts have been made to relate changes in IFT arising from such compounds to the specific nature of the interface. However, the IFT is controlled by an interplay of factors such as temperature and molecular structure of surface-active compounds, which make it difficult to predict IFT as those conditions change. In this study, we present the results from molecular dynamics simulations revealing the specific role surfactants play in IFT. We find that, in addition to reducing direct contact between the two fluids, surfactants serve to increase the disorder at the interface (related to interfacial entropy) and consequently reduce the water/oil IFT, especially when surfactants are present at high surface density. Our results suggest that surfactants that yield more disordered interfacial films (e.g. with flexible and/or unsaturated tails) reduce the water/oil IFT more effectively than surfactants which yield highly ordered interfacial films. Our results shed light on some of the factors that control IFT and could have important practical implications in industrial applications such as the design of cosmetics, food products, and detergents.
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Affiliation(s)
- Tai Bui
- Thomas Young Centre and London Centre for Nanotechnology, and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK. .,BP Exploration Operating Co. Ltd, Chertsey Road, Sunbury-on-Thames TW16 7LN, UK.,Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Harry Frampton
- BP Exploration Operating Co. Ltd, Chertsey Road, Sunbury-on-Thames TW16 7LN, UK
| | - Shanshan Huang
- BP Exploration Operating Co. Ltd, Chertsey Road, Sunbury-on-Thames TW16 7LN, UK
| | - Ian R Collins
- BP Exploration Operating Co. Ltd, Chertsey Road, Sunbury-on-Thames TW16 7LN, UK
| | - Alberto Striolo
- Department of Chemical Engineering, University College London, Gower Street, London WC1E 6BT, UK.,School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK 73019, USA
| | - Angelos Michaelides
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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14
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Lattice Model of Multilayer Adsorption of Particles with Orientation Dependent Interactions at Solid Surfaces. Molecules 2021; 26:molecules26185622. [PMID: 34577091 PMCID: PMC8470913 DOI: 10.3390/molecules26185622] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/06/2021] [Accepted: 09/13/2021] [Indexed: 11/16/2022] Open
Abstract
A simple lattice model has been used to study the formation of multilayer films by fluids with orientation-dependent interactions on solid surfaces. The particles, composed of two halves (A and B) were allowed to take on one of six different orientations. The interaction between a pair of differently oriented neighboring particles was assumed to depend on the degrees to which their A and B parts overlap. Here, we have assumed that the AA interaction was strongly attractive, the AB interaction was set to zero, while the BB interaction was varied between 0 and -1.0. The ground state properties of the model have been determined for the systems being in contact with non-selective and selective walls over the entire range of BB interaction energies between 0 and -1.0. It has been demonstrated that the structure of multilayer films depends on the strengths of surface potential felt by differently oriented particles and the interaction between the B halves of fluid particles. Finite temperature behavior has been studied by Monte Carlo simulation methods. It has been shown that the bulk phase phase diagram is qualitatively independent of the BB interaction energy, and has the swan neck shape, since the high stability of the dense ordered phase suppresses the possibility of the formation of disordered liquid-like phase. Only one class of non-uniform systems with the BB interaction set to zero has been considered. The results have been found to be consistent with the predictions stemming form the ground state considerations. In particular, we have found that a complete wetting occurs at any temperature, down to zero. Furthermore, the sequences of layering transitions, and the structure of multilayer films, have been found to be the same as observed in the ground state.
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15
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Dedovets D, Li Q, Leclercq L, Nardello-Rataj V, Leng J, Zhao S, Pera-Titus M. Multiphase Microreactors Based on Liquid-Liquid and Gas-Liquid Dispersions Stabilized by Colloidal Catalytic Particles. Angew Chem Int Ed Engl 2021; 61:e202107537. [PMID: 34528366 PMCID: PMC9293096 DOI: 10.1002/anie.202107537] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Indexed: 01/08/2023]
Abstract
Pickering emulsions, foams, bubbles, and marbles are dispersions of two immiscible liquids or of a liquid and a gas stabilized by surface‐active colloidal particles. These systems can be used for engineering liquid–liquid–solid and gas–liquid–solid microreactors for multiphase reactions. They constitute original platforms for reengineering multiphase reactors towards a higher degree of sustainability. This Review provides a systematic overview on the recent progress of liquid–liquid and gas–liquid dispersions stabilized by solid particles as microreactors for engineering eco‐efficient reactions, with emphasis on biobased reagents. Physicochemical driving parameters, challenges, and strategies to (de)stabilize dispersions for product recovery/catalyst recycling are discussed. Advanced concepts such as cascade and continuous flow reactions, compartmentalization of incompatible reagents, and multiscale computational methods for accelerating particle discovery are also addressed.
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Affiliation(s)
- Dmytro Dedovets
- Eco-Efficient Products and Processes Laboratory (E2P2L), UMI 3464 CNRS-Solvay, 3966 Jin Du Road, Xin Zhuang Ind Zone, 201108, Shanghai, China.,Laboratoire du Futur (LOF), UMR 5258, CNRS-Solvay-Universite Bordeaux 1, 178 Av Dr Albert Schweitzer, 33608, Pessac Cedex, France
| | - Qingyuan Li
- Eco-Efficient Products and Processes Laboratory (E2P2L), UMI 3464 CNRS-Solvay, 3966 Jin Du Road, Xin Zhuang Ind Zone, 201108, Shanghai, China
| | - Loïc Leclercq
- Univ Lille, CNRS, Centrale Lille, Univ Artois, UMR 8181 UCCS, F-59000, Lille, France
| | | | - Jacques Leng
- Laboratoire du Futur (LOF), UMR 5258, CNRS-Solvay-Universite Bordeaux 1, 178 Av Dr Albert Schweitzer, 33608, Pessac Cedex, France
| | - Shuangliang Zhao
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, 530004, Nanning, China
| | - Marc Pera-Titus
- Eco-Efficient Products and Processes Laboratory (E2P2L), UMI 3464 CNRS-Solvay, 3966 Jin Du Road, Xin Zhuang Ind Zone, 201108, Shanghai, China.,Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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16
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Sicard F, Toro-Mendoza J. Armored Droplets as Soft Nanocarriers for Encapsulation and Release under Flow Conditions. ACS NANO 2021; 15:11406-11416. [PMID: 34264056 PMCID: PMC8397430 DOI: 10.1021/acsnano.1c00955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 07/13/2021] [Indexed: 05/05/2023]
Abstract
Technical challenges in precision medicine and environmental remediation create an increasing demand for smart materials that can select and deliver a probe load to targets with high precision. In this context, soft nanomaterials have attracted considerable attention due to their ability to simultaneously adapt their morphology and functionality to complex ambients. Two major challenges are to precisely control this adaptability under dynamic conditions and provide predesigned functionalities that can be manipulated by external stimuli. Here, we report on the computational design of a distinctive class of soft nanocarriers, built from armored nanodroplets, able to selectively encapsulate or release a probe load under specific flow conditions. First, we describe in detail the mechanisms at play in the formation of pocket-like structures in armored nanodroplets and their stability under external flow. Then we use that knowledge to test the capacity of these pockets to yield flow-assisted encapsulation or expulsion of a probe load. Finally, the rheological properties of these nanocarriers are put into perspective with those of delivery systems employed in pharmaceutical and cosmetic technology.
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Affiliation(s)
- François Sicard
- Department
of Physics and Astronomy, University College
London, WC1E 6BT London, U.K.
- Department
of Chemical Engineering, University College
London, WC1E 7JE London, U.K.
| | - Jhoan Toro-Mendoza
- Centro
de Estudios Interdisciplinarios de la Fisica, Instituto Venezolano de Investigaciones Cientificas, Caracas 1020A, Venezuela
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17
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Gu S, Xu Z, Yang X. Molecular Insight into the Adsorption Thermodynamics and Interfacial Behavior of GOs at the Liquid-Liquid Interface. J Phys Chem B 2021; 125:1924-1935. [PMID: 33566621 DOI: 10.1021/acs.jpcb.0c10118] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The adsorption of two-dimensional (2-D) graphene oxide (GO) nanosheets at liquid-liquid interfaces has broad technological implications from functional material preparations to oil-water emulsification. Molecular-level understanding of the adsorption thermodynamics and the interfacial behavior is of great significance. Here, the adsorption free energy of GO nanosheets at the water-cyclohexane system was simulated, in which the effect of oxygen-containing groups and deprotonation has been investigated. It was observed that the neutral GO (GO-COOH) has obvious interfacial activity with a reduction of interfacial tension, while the deprotonated GO (GO-COO-) shows a weak interface affinity. There exists an optimal oxidization degree that could cause the best interfacial stability, which is attributed to the balance of interfacial hydrophilic-hydrophobic interactions. The interaction arising from water is the main factor determining interfacial activity. The interfacial morphology and dynamics of GO nanosheets have also been simulated, in which an anisotropic 2-D translation and rotation along the interface were revealed. Our simulation results provide new insight into the adsorption mechanism and dynamics behavior of GO at the oil-water interface.
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Affiliation(s)
- Shuyin Gu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Zhijun Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Xiaoning Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, P. R. China
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18
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Khedr A, Striolo A. Self-assembly of mono- and poly-dispersed nanoparticles on emulsion droplets: antagonistic vs. synergistic effects as a function of particle size. Phys Chem Chem Phys 2020; 22:22662-22673. [PMID: 33015700 DOI: 10.1039/d0cp02588g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, using Dissipative Particle Dynamics simulations, we provide fundamental insights into the self-assembly of nanoparticles (NPs) on droplet surfaces in an oil-in-water emulsion. We highlight the effect of particle size on the arrangement of NPs for different interparticle interactions. NPs of two different sizes were considered. In general, when the NP-NP interaction is changed from repulsive to attractive, a transition in the NP arrangement occurs from weekly-connected networks to clusters of NPs separated by particle-free domains. When NP-NP interactions are strongly attractive, NPs yield small 3D aggregates on the droplet surface. These arrangements seem to agree with experimental observations reported in the literature. In addition, our simulations suggest that small NPs are able to diffuse more easily on the droplet surface, which leads to prompt self-organisation, while large NPs are more likely to form metastable structures, perhaps because of slow mobility and strong adsorption to the interface. Our analysis suggests that thermal fluctuations could provide the activation energy for the small NPs to escape local minima in the free energy landscape. The results obtained for systems containing NPs of two sizes provide evidence of size segregation on the droplet surface, which could be useful when NP self-assemblies are used, for example, to template supra-molecular materials. However, analysis of the simulated trajectories suggests that the results depend strongly on the initial configuration, as the larger NPs seem to impose barriers for the small NPs to adsorb and diffuse on the droplet surface.
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Affiliation(s)
- Abeer Khedr
- Department of Chemical Engineering, University College London, UK.
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19
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Moncayo-Riascos I, Hoyos BA. Fluorocarbon versus hydrocarbon organosilicon surfactants for wettability alteration: A molecular dynamics approach. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.04.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Jalilvand Z, Haider H, Cui J, Kretzschmar AI. Pt-SiO 2 Janus Particles and the Water/Oil Interface: A Competition between Motility and Thermodynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:6880-6887. [PMID: 32050073 DOI: 10.1021/acs.langmuir.9b03454] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Various aspects of the behavior of Janus particles near liquid/liquid interfaces have been studied through different experimental and theoretical realizations, but the effect of motility on the behavior of Janus particles near liquid/liquid interfaces has not been investigated, yet. Here, we demonstrate the ability to engineer the behavior of highly interfacial active Janus particles near a water/oil interface by introducing motility to the system. Passive, i.e., nonmotile, platinum-capped 8 μm silica (Pt-SiO2) Janus particles exhibit a strong tendency to attach to water/oil interfaces with the Pt-cap facing the oil and the SiO2 side facing the water phase. In contrast, we show that active, i.e., motile, 8 μm Pt-SiO2 Janus particles approach the interface, orient in a sideways fashion with the Janus boundary perpendicular to the interface, and then swim in the vicinity of the interface similar to observations reported near solid/liquid interfaces. Active Pt-SiO2 Janus particles near the water/oil interface show motility as a result of adding H2O2 to the particle solution. The decomposition of H2O2 into O2 and H2O creates a nonuniform gradient of O2 around the particle that hydrodynamically interacts with the water/decalin boundary. The interaction enables rotation of the particle within the swimming plane that is parallel to the interface but restricts rotation in and out of the swimming plane, thereby preventing adsorption to the liquid/liquid interface.
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Affiliation(s)
- Zohreh Jalilvand
- Department of Chemical Engineering, The City College of New York, New York , New York 10031, United States
| | - Hamad Haider
- Department of Chemical Engineering, The City College of New York, New York , New York 10031, United States
| | - Jingqin Cui
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, Fujian 361005, PR China
| | - And Ilona Kretzschmar
- Department of Chemical Engineering, The City College of New York, New York , New York 10031, United States
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21
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Li W, Nan Y, You Q, Xie Q, Jin Z. Effects of salts and silica nanoparticles on oil-brine interfacial properties under hydrocarbon reservoir conditions: A molecular dynamics simulation study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112860] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Greydanus B, Schwartz DK, Medlin JW. Controlling Catalyst-Phase Selectivity in Complex Mixtures with Amphiphilic Janus Particles. ACS APPLIED MATERIALS & INTERFACES 2020; 12:2338-2345. [PMID: 31851487 DOI: 10.1021/acsami.9b16957] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Amphiphilic Janus particles with a catalyst selectively loaded on either the hydrophobic or hydrophilic region are promising candidates for efficient and phase-selective interfacial catalysis. Here, we report the synthesis and characterization of Janus silica particles with a hydrophilic silica domain and a silane-modified hydrophobic domain produced via a wax masking technique. Palladium nanoparticles were regioselectively deposited on the hydrophobic side, and the phase selectivity of the catalytic Janus particles was established through the kinetic studies of benzyl alcohol hydrodeoxygenation (HDO). These studies indicated that the hydrophobic moiety provided nearly 100× the catalytic activity as the hydrophilic side for benzyl alcohol HDO. The reactivity was linked to the anisotropic catalyst design through microscopy of the particles. The catalysts were also used to achieve phase-specific compartmentalized hydrogenation and selective in situ catalytic degradation of a model oily pollutant in a complex oil/water mixture.
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Affiliation(s)
- Benjamin Greydanus
- Department of Chemical and Biological Engineering , University of Colorado, Boulder , Boulder , Colorado 80309 , United States
| | - Daniel K Schwartz
- Department of Chemical and Biological Engineering , University of Colorado, Boulder , Boulder , Colorado 80309 , United States
| | - J Will Medlin
- Department of Chemical and Biological Engineering , University of Colorado, Boulder , Boulder , Colorado 80309 , United States
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23
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Sabeela N, Almutairi TM, Al-Lohedan HA, Atta AM. Surface Activity of Smart Hybrid Polysiloxane- co- N-isopropylacrylamide Microgels. ACS OMEGA 2019; 4:21395-21409. [PMID: 31867534 PMCID: PMC6921624 DOI: 10.1021/acsomega.9b03102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 11/19/2019] [Indexed: 06/10/2023]
Abstract
Amphiphilic smart gels of different sizes (macro, micro, and nano) are widely used in advanced medical, industrial, and environmental applications. They are sensitive, responsive to different environments, and possess a high surface activity to adsorb onto different interfaces. In this study, new amphiphilic alkoxysilane-containing microgels, hybrid polysiloxane microgel, and silica nanoparticles were prepared using a cross-linking surfactant-free cross-linking polymerization technique for N-isopropylacrylamide (NIPAm) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) monomers. Vinyltrimethoxysilane (VTS) was used as a silane precursor in the cross-linking polymerization to hydrolyze with tetraethoxysilane (TEOS) in ammonia using an emulsion technique, to create polysiloxane microgel and silica nanoparticles. The surface activity measurements confirmed that NIPAm/VTS had a higher surface activity than NIPAm/AMPS-VTS microgels and their hybrid polysiloxane microgel owing to the differences of the cross-linking of microgels from the center to the microgel periphery, which alter their morphologies.
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Affiliation(s)
- Nourah
I. Sabeela
- Surfactants
Research Chair, Chemistry Department, College of Science and Chemistry Department,
College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Tahani M. Almutairi
- Surfactants
Research Chair, Chemistry Department, College of Science and Chemistry Department,
College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Hamad A. Al-Lohedan
- Surfactants
Research Chair, Chemistry Department, College of Science and Chemistry Department,
College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Ayman M. Atta
- Surfactants
Research Chair, Chemistry Department, College of Science and Chemistry Department,
College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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24
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Razavi S, Lin B, Lee KYC, Tu RS, Kretzschmar I. Impact of Surface Amphiphilicity on the Interfacial Behavior of Janus Particle Layers under Compression. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15813-15824. [PMID: 31269790 DOI: 10.1021/acs.langmuir.9b01664] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Langmuir monolayers of silica/gold Janus particles with two different degrees of amphiphilicity have been examined to study the significance of particle surface amphiphilicity on the structure and mechanical properties of the interfacial layers. The response of the layers to the applied compression provides insight into the nature and strength of the interparticle interactions. Different collapse modes observed for the interfacial layers are linked to the amphiphilicity of Janus particles and their configuration at the interface. Molecular dynamics simulations on nanoparticles with similar contact angles provide insight on the arrangement of particles at the interface and support our conclusion that the interfacial configuration and collapse of anisotropic particles at the air/water interface are controlled by particle amphiphilicity.
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Affiliation(s)
- Sepideh Razavi
- Chemical, Biological, and Materials Engineering , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | | | | | - Raymond S Tu
- Department of Chemical Engineering , City College of the City University of New York , New York , New York 10031 , United States
| | - Ilona Kretzschmar
- Department of Chemical Engineering , City College of the City University of New York , New York , New York 10031 , United States
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25
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Ivanova AA, Phan C, Barifcani A, Iglauer S, Cheremisin AN. Effect of Nanoparticles on Viscosity and Interfacial Tension of Aqueous Surfactant Solutions at High Salinity and High Temperature. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12371] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anastasia A. Ivanova
- Center for Hydrocarbon RecoverySkolkovo Institute of Science and Technology 3 Nobel Street, Moscow 121205 Russia
- Western Australian School of Mines (WASM): Minerals, Energy and Chemical EngineeringCurtin University 26 Dick Perry Avenue, Kensington 6151 Australia
| | - Chi Phan
- Discipline of Chemical EngineeringCurtin University Kent Street, Bentley 6102 Australia
| | - Ahmed Barifcani
- Western Australian School of Mines (WASM): Minerals, Energy and Chemical EngineeringCurtin University 26 Dick Perry Avenue, Kensington 6151 Australia
| | - Stefan Iglauer
- School of EngineeringEdith Cowan University 270 Joondalup Drive, Joondalup 6027 Australia
| | - Alexey N. Cheremisin
- Center for Hydrocarbon RecoverySkolkovo Institute of Science and Technology 3 Nobel Street, Moscow 121205 Russia
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26
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Gvaramia M, Mangiapia G, Pipich V, Appavou MS, Jaksch S, Holderer O, Rukhadze MD, Frielinghaus H. Tunable viscosity modification with diluted particles: when particles decrease the viscosity of complex fluids. Colloid Polym Sci 2019. [DOI: 10.1007/s00396-019-04567-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Abstract
While spherical particles are the most studied viscosity modifiers, they are well known only to increase viscosities, in particular at low concentrations of approx. 1%. Extended studies and theories on non-spherical particles in simple fluids find a more complicated behavior, but still a steady increase with increasing concentration. Involving platelets in combination with complex fluids—in our case, a bicontinuous microemulsion—displays an even more complex scenario that we analyze experimentally and theoretically as a function of platelet diameter using small angle neutron scattering, rheology, and the theory of the lubrication effect, to find the underlying concepts. The clay particles effectively form membranes in the medium that itself may have lamellar aligned domains and surfactant films in the case of the microemulsion. The two-stage structure of clay and surfactant membranes explains the findings using the theory of the lubrication effect. This confirms that layered domain structures serve for lowest viscosities. Starting from these findings and transferring the condition for low viscosities to other complex fluids, namely crude oils, even lowered viscosities with respect to the pure crude oil were observed. This strengthens our belief that also here layered domains are formed as well. This apparent contradiction of a viscosity reduction by solid particles could lead to a wider range of applications where low viscosities are desired. The same concepts of two-stage layered structures also explain the observed conditions for extremely enhanced viscosities at particle concentrations of 1% that may be interesting for the food industry.
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27
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Synergistic effects of surfactants and heterogeneous nanoparticles at oil-water interface: Insights from computations. J Colloid Interface Sci 2019; 553:50-58. [DOI: 10.1016/j.jcis.2019.05.102] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 05/29/2019] [Accepted: 05/30/2019] [Indexed: 11/21/2022]
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28
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Separation of water–oil mixture on poly methyl methacrylate surface using TiO2 nanoparticles via molecular dynamics simulation. ADSORPTION 2019. [DOI: 10.1007/s10450-019-00119-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Qin S, Yong X. Controlling the stability of Pickering emulsions by pH-responsive nanoparticles. SOFT MATTER 2019; 15:3291-3300. [PMID: 30821791 DOI: 10.1039/c8sm02407c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Electrostatic dissipative particle dynamics simulations were conducted to model the interactions between emulsion droplets stabilized by pH-sensitive polyelectrolyte-grafted nanoparticles. Using a steered molecular dynamics approach, a mechanistic study of forced coalescence was performed to probe the resistance between two particle-covered droplets. The degree of ionization of the grafted polyelectrolytes was adjusted to capture the pH responsiveness. The maximal resistance forces were measured to quantitatively discriminate the efficacy of particles in stabilizing emulsions at different degrees of ionization. Through analyzing droplet dynamics, resistance force variation, and electric field, we discovered that the resistance is attributed to direct electrostatic repulsion, the image charge effect near the water-oil interface, and steric hindrance among extended polymers. When the particle density on the droplet surface is relatively low, the increasing resistance forces at higher degrees of ionization can effectively prevent droplet coalescence. Oppositely, the ionization compromises emulsion stability when the particle surface coverage is high. Substantial desorption of particles from the interface was triggered as the degree of ionization increases. This in turn reduces resistance force and facilitates coalescence. Moreover, the nanoparticles prevent coalescence at high surface coverages by forming dense layers at individual interfaces, while the particle bridges straddling two interfaces were found at low surface coverages, which can also keep the droplets apart.
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Affiliation(s)
- Shiyi Qin
- Department of Mechanical Engineering, Binghamton University, The State University of New York, 4400 Vestal Parkway East, Binghamton, New York 13902, USA.
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30
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Jiang H, Fialoke S, Vicars Z, Patel AJ. Characterizing surface wetting and interfacial properties using enhanced sampling (SWIPES). SOFT MATTER 2019; 15:860-869. [PMID: 30644500 DOI: 10.1039/c8sm02317d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We introduce an accurate and efficient method for characterizing surface wetting and interfacial properties, such as the contact angle made by a liquid droplet on a solid surface, and the vapor-liquid surface tension of a fluid. The method makes use of molecular simulations in conjunction with the indirect umbrella sampling technique to systematically wet the surface and estimate the corresponding free energy. To illustrate the method, we study the wetting of a family of Lennard-Jones surfaces by water. For surfaces with a wide range of attractions for water, we estimate contact angles using our method, and compare them with contact angles obtained using droplet shapes. Notably, our method is able to capture the transition from partial to complete wetting as surface-water attractions are increased. Moreover, the method is straightforward to implement and is computationally efficient, providing accurate contact angle estimates in roughly 5 nanoseconds of simulation time.
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Affiliation(s)
- Hao Jiang
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
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31
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Zhang M, Tang Z, Fu W, Wang W, Tan R, Yin D. An ionic liquid-functionalized amphiphilic Janus material as a Pickering interfacial catalyst for asymmetric sulfoxidation in water. Chem Commun (Camb) 2019; 55:592-595. [DOI: 10.1039/c8cc08292h] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Novel IL-functionalized amphiphilic Janus chiral salen TiIV catalysts behaved as Pickering interfacial catalysts, dramatically accelerating asymmetric sulfoxidation with aq. H2O2 in water through the formation of stable Pickering emulsions.
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Affiliation(s)
- Mingjie Zhang
- National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- Hunan Normal University
- Changsha 410081
- P. R. China
| | - Zhiyang Tang
- National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- Hunan Normal University
- Changsha 410081
- P. R. China
| | - Wenqin Fu
- National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- Hunan Normal University
- Changsha 410081
- P. R. China
| | - Weiying Wang
- National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- Hunan Normal University
- Changsha 410081
- P. R. China
| | - Rong Tan
- National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- Hunan Normal University
- Changsha 410081
- P. R. China
| | - Donghong Yin
- National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- Hunan Normal University
- Changsha 410081
- P. R. China
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32
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Wen B, Sun C, Bai B. Nanoparticle-induced ion-sensitive reduction in decane-water interfacial tension. Phys Chem Chem Phys 2018; 20:22796-22804. [PMID: 30141795 DOI: 10.1039/c8cp04041a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synergistic effect of ions and nanoparticles on the interfacial tension is of great significance for extensive applications in interface-related industrial processes. However, its mechanisms are still unclear owing to a lack of understanding on the interaction between nanoparticles/ions at the interface. Here, we employ the molecular dynamics method to explore the synergistic effect of ions and nanoparticles on reducing the decane-water interfacial tension and reveal the dominant role of the three-phase contact angle and the interaction between nanoparticles. The results show that the reduction of interfacial tension is sensitive to cation species and temperature. The stronger hydration of cations induces an increased three-phase contact angle, weakening the interaction between nanoparticles and water molecules at the interface. Hence, the virial term of interfacial tension decreases. Meanwhile, the potential of mean force between nanoparticles at the interface indicates that the order of interaction strength between nanoparticles for different cations is Ca2+ > Mg2+ > Na+. The strong interaction between nanoparticles restricts the motion of nanoparticles and water molecules at the interface, inducing a reduced kinetic energy term of interfacial tension. Therefore, the interfacial tension decreases after adding the nanoparticles. Besides, as temperature rises, the difference in the adsorption ability of nanoparticles on water molecules causes a falling interfacial tension with a characteristic stage.
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Affiliation(s)
- Boyao Wen
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
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Katiyar P, Singh JK. The effect of ionisation of silica nanoparticles on their binding to nonionic surfactants in oil–water system: an atomistic molecular dynamic study. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1456683] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Parul Katiyar
- Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur, India
| | - Jayant K. Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur, India
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34
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Cao J, Song T, Zhu Y, Wang X, Wang S, Yu J, Ba Y, Zhang J. Aqueous hybrids of amino-functionalized nanosilica and acrylamide-based polymer for enhanced oil recovery. RSC Adv 2018; 8:38056-38064. [PMID: 35558622 PMCID: PMC9089851 DOI: 10.1039/c8ra07076h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/02/2018] [Indexed: 11/21/2022] Open
Abstract
Amino-functionalized nanosilica (ANS) was prepared using nanosilica (NS) and 3-aminopropyltriethoxysilane (APTES) aiming to reinforce the interaction between nanoparticles and polymer molecules. The copolymer of acrylamide, 2-acrylamido-2-methyl-1-propane sulfonic acid (PM), and four ANS samples with different NS to APTES ratios were synthesized. A series of nanoparticle/polymer hybrid systems were fabricated by introducing NS or ANS suspension into PM aqueous solution. The rheological properties and surface activities of these hybrid systems were studied in comparison with PM. The results indicate that the salt-tolerance and heat-resistance properties of PM solution were improved by the introduction of ANS particles. Moreover, the structures of ANS samples have a significant effect on the effectiveness of the nanoparticles due to the fact that the amine group density on the ANS surface can affect the strength of intermolecular interaction between nanoparticles and polymer molecules. Additionally, the better ability of the ANS sample with proper amine group density showed in reducing the oil/water interfacial tension over NS and other ANS samples made it a more promising chemical for enhancing oil recovery. The results from core flooding tests show that the PM/ANS system has the greatest oil recovery factor (16.30%), while the values for PM/NS and PM are 10.84% and 6.00%, respectively. The amino-functionalized nanosilica/polymer hybrid systems have better salt tolerance and EOR performance than unmodified nanosilica polymer hybrid systems.![]()
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Affiliation(s)
- Jie Cao
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- China
| | - Tao Song
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- China
| | - Yuejun Zhu
- CNOOC Research Institute
- Beijing 100027
- China
- State Key Lab of Offshore Oil Exploitation
- Beijing 100027
| | - Xiujun Wang
- CNOOC Research Institute
- Beijing 100027
- China
- State Key Lab of Offshore Oil Exploitation
- Beijing 100027
| | - Shanshan Wang
- CNOOC Research Institute
- Beijing 100027
- China
- State Key Lab of Offshore Oil Exploitation
- Beijing 100027
| | - Jingcheng Yu
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- China
| | - Yin Ba
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- China
| | - Jian Zhang
- CNOOC Research Institute
- Beijing 100027
- China
- State Key Lab of Offshore Oil Exploitation
- Beijing 100027
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35
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Al-Anssari S, Wang S, Barifcani A, Iglauer S. Oil-Water Interfacial Tensions of Silica Nanoparticle-Surfactant Formulations. TENSIDE SURFACT DET 2017. [DOI: 10.3139/113.110511] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Abstract
The implementation of nanotechnology in all industries is one of most significant research fields. Nanoparticles have shown a promising application in subsurface fields. On the other hand, various surfactants have been used in the oil industry to reduce oil/water interfacial tension and also widely used to stabilize the nano-suspensions. The primary objective of this study was to investigate the improvements of surfactants ability in term of interfacial tension (γ) reduction utilizing addition of silicon dioxide nanoparticles at different temperatures and salinity. The pendant drop technique has been used to measure γ and electrical conductivity has been used to measure the critical micelle concentration (CMC). The synergistic effects of surfactant-nanoparticles, salt-nanoparticles, and surfactant-salt-nanoparticles on γ reduction and the critical micelle concentration of the surfactants have been investigated. Extensive series of experiments for γ and CMC measurements were performed. The optimum condition for each formulation is shown. We conclude that nanoparticles-surfactant can significantly reduce γ if correctly formulated.
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Affiliation(s)
- Sarmad Al-Anssari
- Department of Chemical Engineering , Curtin University, Kent Street, 6102 Bentley , Australia
- Department of Chemical Engineering , University of Baghdad , Iraq
| | - Shaobin Wang
- Department of Chemical Engineering , Curtin University, Kent Street, 6102 Bentley , Australia
| | - Ahmed Barifcani
- Department of Chemical Engineering , Curtin University, Kent Street, 6102 Bentley , Australia
- Department of Petroleum Engineering , Curtin University, 26 Dick Perry Avenue, 6151 Kensington , Australia
| | - Stefan Iglauer
- Department of Petroleum Engineering , Curtin University, 26 Dick Perry Avenue, 6151 Kensington , Australia
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36
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Sinha N, Singh JK. Effect of nanoparticles on vapour-liquid surface tension of water: A molecular dynamics study. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Lin H, Fan J, Weng P, Si X, Zhao X. Molecular Dynamics Simulations on the Behaviors of Hydrophilic/Hydrophobic Cyclic Peptide Nanotubes at the Water/Hexane Interface. J Phys Chem A 2017; 121:6863-6873. [PMID: 28836781 DOI: 10.1021/acs.jpca.7b02465] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, nine kinds of amino acid residues, i.e., alanine (A), leucine (L), valine (V), isoleucine (I), tryptophan (W), glutamine (Q), threonine (T), serine (S), and cysteine (C), were selected to construct seven cyclic peptide nanotubes (CPNTs) with diverse hydrophilic/hydrophobic external surfaces, which were further separately inserted at the water/hexane interface to investigate their microstructures and interfacial properties. Molecular dynamics (MD) simulations reveal that all the CPNTs except the QT- and VL-CPNTs have different degrees of tilt, fracture, and shedding at the interface. The end-CPs are more susceptible to the effect of the surroundings than the mid-CPs. The interactions of individual CP subunits with the neighborings disclose the firmness of the mid-CPs and the dissociation of the end-CPs. The results indicate that a hydrophobic CPNT is prone to stay at the interface, while a hydrophilic CPNT easily enters the water phase, resulting in many H-bonds with water. Results in this work enrich the dynamic properties of a hydrophilic/hydrophobic CPNT at the biphase interface at the atomic level.
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Affiliation(s)
- Huifang Lin
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, People's Republic of China
| | - Jianfen Fan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, People's Republic of China
| | - Peipei Weng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, People's Republic of China
| | - Xialan Si
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, People's Republic of China
| | - Xin Zhao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, People's Republic of China
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38
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Bradley LC, Chen WH, Stebe KJ, Lee D. Janus and patchy colloids at fluid interfaces. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2017.05.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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39
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Abstract
The buckling mechanism in droplets stabilized by solid particles (armored droplets) is tackled at a mesoscopic level using dissipative particle dynamics simulations. We consider one spherical water droplet in a decane solvent coated with nanoparticle monolayers of two different types: Janus (particles whose surface shows two regions with different wetting properties) and homogeneous. The chosen particles yield comparable initial three-phase contact angles, selected to maximize the adsorption energy at the interface. We study the interplay between the evolution of droplet shape, layering of the particles, and their distribution at the interface when the volume of the droplets is reduced. We show that Janus particles affect strongly the shape of the droplet with the formation of a crater-like depression. This evolution is actively controlled by a close-packed particle monolayer at the curved interface. In contrast, homogeneous particles follow passively the volume reduction of the droplet, whose shape does not deviate too much from spherical, even when a nanoparticle monolayer/bilayer transition is detected at the interface. We discuss how these buckled armored droplets might be of relevance in various applications including potential drug delivery systems and biomimetic design of functional surfaces.
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Affiliation(s)
- François Sicard
- Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK.
| | - Alberto Striolo
- Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK.
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40
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Katiyar P, Singh JK. A coarse-grain molecular dynamics study of oil-water interfaces in the presence of silica nanoparticles and nonionic surfactants. J Chem Phys 2017; 146:204702. [PMID: 28571351 DOI: 10.1063/1.4984073] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, we have studied the effect of hydrophilic silica nanoparticles (NPs), in the presence of nonionic surfactants (Triethylene glycol monododecyl ether and Tween 20), on the oil-water (n-octane-water, n-dodecane-water and n-hexadecane-water) interfacial tensions (IFTs) at 300 K, using coarse-grained molecular dynamics simulations based on the MARTINI force field. Simulation results indicate that silica NPs solely do not affect the IFT. However, the silica NPs may or may not increase the IFT of oil-water containing nonionic surfactant, depending on the tendency of the surfactant to adsorb on the surface of NPs. The adsorption occurs due to the formation of hydrogen bonds, and adsorption increases with a decrease in pH, as seen in experimental studies. In this work, we found that the oil-water IFT increases with an increasing amount of adsorption of the surfactant on NPs. At a fixed amount of adsorption of the surfactant on NPs, the IFT behavior is indifferent to the change in concentration of NPs. However, the IFT decreases with an increase in surfactant concentration. We present a detailed analysis of the density profile and intrinsic width of the interface. The IFT behavior is found to correlate extremely well with the intrinsic width of the interface. The current study provides an explanation for the increase in IFT observed in a recent experiment [N. R. Biswal et al., J. Phys. Chem. B 120, 7265-7274 (2016)] for various types of NPs and nonionic surfactant systems.
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Affiliation(s)
- Parul Katiyar
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Jayant K Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
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41
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Zhao S, Zhan B, Hu Y, Fan Z, Pera-Titus M, Liu H. Dynamics of Pickering Emulsions in the Presence of an Interfacial Reaction: A Simulation Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12975-12985. [PMID: 27951708 DOI: 10.1021/acs.langmuir.6b03046] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Pickering emulsions combining surface-active and catalytic properties offer a promising platform for conducting interfacial reactions between immiscible reagents. Despite the significant progress in the design of Pickering interfacial catalysts for a broad panel of reactions, the dynamics of Pickering emulsions under reaction conditions is still poorly understood. Herein, using benzene hydroxylation with aqueous H2O2 as a model system, we explored the dynamics of benzene/water Pickering emulsions during reaction by dissipative particle dynamics. Our study points out that the surface wettability of the silica nanoparticles is affected to a higher extent by the degree of polymer grafting rather than an increase of the chain length of hydrophobic polymer moieties. A remarkable decline of the oil-in-water (O/W) interfacial tension was observed when increasing the yield of the reaction product (phenol), affecting the emulsion stability. However, phenol did not alter to an important extent the distribution of immiscible reagents around the nanoparticles sitting at the benzene/water interface. A synergistic effect between phenol and silica nanoparticles on the O/W interfacial tension of the biphasic system could be ascertained.
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Affiliation(s)
| | | | | | - Zhaoyu Fan
- Eco-Efficient Products and Processes Laboratory (E2P2L), UMI 3464 CNRS-Solvay , 3966 Jin Du Road, Xinzhuang Industrial Zone, Shanghai 201108, People's Republic of China
| | - Marc Pera-Titus
- Eco-Efficient Products and Processes Laboratory (E2P2L), UMI 3464 CNRS-Solvay , 3966 Jin Du Road, Xinzhuang Industrial Zone, Shanghai 201108, People's Republic of China
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42
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Yiapanis G, Makarucha AJ, Baldauf JS, Downton MT. Simulations of graphitic nanoparticles at air-water interfaces. NANOSCALE 2016; 8:19620-19628. [PMID: 27853794 DOI: 10.1039/c6nr06475b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The free energy associated with transferring a set of fullerene particles through a finite water layer is calculated using explicit solvent molecular dynamic simulations. Each fullerene particle is a carbon network of one or more spheroidal shells of graphitic carbon, and include single-shell (single-wall) or nested multi-shelled (nano-onions) structures ranging from 6 to 28 Å in radius. Corresponding changes in energy suggest a stronger affinity of carbon nano-onions for water compared to their single-shelled analogues. In the case of multi-shelled structures, the free energy profiles display a global minimum only in the bulk liquid indicating a high affinity of multi-shelled fullerene for complete hydration. Single-wall particles however, display a minimum at the air-water interface and for particles larger than 2 nm this minimum is a global minimum possessing a lower energy compared to the particle's state of complete hydration. While the propensity for single-shell particles to adsorb to the air-interface may increase with increasing particle size, there is an indication based on line tension calculations that larger single-shell particles may actually exhibit enhanced wetting compared to their smaller analogues.
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Affiliation(s)
- George Yiapanis
- IBM Research Australia, Lvl 5/204 Lygon St., Carlton, VIC 3053, Australia.
| | | | - Julia S Baldauf
- IBM Research Australia, Lvl 5/204 Lygon St., Carlton, VIC 3053, Australia.
| | - Matthew T Downton
- IBM Research Australia, Lvl 5/204 Lygon St., Carlton, VIC 3053, Australia.
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43
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Kojima T, Hirai K, Zhou Y, Weerappuli P, Takayama S, Kotov NA. Nanoparticle Assemblies into Luminescent Dendrites in Shrinking Microdroplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12468-12475. [PMID: 27571169 DOI: 10.1021/acs.langmuir.6b01960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The self-assembly of nanoparticles (NPs) is essential for emerging dispersion-based energy-conscious technologies. Of particular interest are micro- and macro-scale self-organizing superstructures that can bridge 2D/3D processing scales. Here we report the spontaneous assembly of CdTe NPs within an aqueous microdroplet suspended in soybean oil. The gradual diffusion of the water into the surrounding medium results in shrinking of the microdroplet, and a concomitant formation of branched assemblies from CdTe NPs that evolve in size from ∼50 μm to ∼1000 μm. The fractal dimension of NP assemblies increases from ∼1.7 to ∼1.9 during the assembly process. We found that constituents of the soybean oil enter the aqueous solution across the microdroplet interface and affect NP assembly. The obtained NP dendrites can be further altered morphologically by illumination with light that results in the disassembly of the NP dendrites. The use of this microheterogeneous dispersion platform with partially soluble hydrophilic and hydrophobic solvents highlights the sensitivity of the NP assembly process to environment and presents an opportunity to explore droplet-confined NP assembly.
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Affiliation(s)
| | | | | | - Priyan Weerappuli
- Department of Biomedical Engineering, Wayne State University , Detroit, Michigan 48202, United States
| | - Shuichi Takayama
- Michigan Center for Integrative Research in Critical Care , Ann Arbor, Michigan 48109, United States
| | - Nicholas A Kotov
- Michigan Center for Integrative Research in Critical Care , Ann Arbor, Michigan 48109, United States
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44
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Hua X, Bevan MA, Frechette J. Reversible Partitioning of Nanoparticles at an Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11341-11352. [PMID: 27564252 DOI: 10.1021/acs.langmuir.6b02255] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The reversible adsorption of nanoparticles (NPs) to oil-water interfaces has been observed experimentally, however, models capable of interpreting and predicting the equilibrium partitioning of particles between bulk media and fluid interfaces are still lacking. Here we characterize the adsorption of 5 nm gold NPs functionalized with ion-pair ligands at the toluene-water interface. Partitioning of the NPs between the bulk aqueous phase and the interface is measured via absorbance spectroscopy for two different aqueous-phase pH values (11.0 and 11.7) and over several orders of magnitude of aqueous phase NP concentration. The surface pressure of the interfacial film in equilibrium with the bulk aqueous phase is measured using the pendant drop method. We determine the range of surface pressure where the adsorption is reversible as well as conditions under which the adsorbed NPs are irreversibly adsorbed at the oil-water interface. We analyze together the adsorption and surface pressure isotherms to obtain the two-dimensional equations of state (EOS) for the NPs in equilibrium with the bulk aqueous phase. The experimental data are then compared to the Frumkin models. We find that the adsorption isotherm and the equation of state show good agreement at low coverage with the Frumkin equations; however, both curves cannot be described with the same parameters. We also show that the low-coverage portion of the EOS can also be described by a wetting model. We hypothesize that deviations from models at higher coverage are likely due to nonequilibrium effects and possible coadsorption.
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Affiliation(s)
- Xiaoqing Hua
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Michael A Bevan
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Joelle Frechette
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States
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45
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Zhou C, Luo SK, Sun Y, Zhou Y, Qian W. Dissipative particle dynamics studies on the interfacial tension of A/B homopolymer blends and the effect of Janus nanorods. J Appl Polym Sci 2016. [DOI: 10.1002/app.44098] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Chun Zhou
- School of Materials Science and Engineering; Southwest University of Science and Technology; Mianyang 621010 China
- Institute of Chemical Materials; Chinese Academy of Engineering and Physics; Mianyang 621900 China
| | - Shi-kai Luo
- School of Materials Science and Engineering; Southwest University of Science and Technology; Mianyang 621010 China
- Institute of Chemical Materials; Chinese Academy of Engineering and Physics; Mianyang 621900 China
| | - Yi Sun
- School of Materials Science and Engineering; Southwest University of Science and Technology; Mianyang 621010 China
| | - Yang Zhou
- Institute of Chemical Materials; Chinese Academy of Engineering and Physics; Mianyang 621900 China
| | - Wen Qian
- Institute of Chemical Materials; Chinese Academy of Engineering and Physics; Mianyang 621900 China
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46
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Boles MA, Engel M, Talapin DV. Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials. Chem Rev 2016; 116:11220-89. [PMID: 27552640 DOI: 10.1021/acs.chemrev.6b00196] [Citation(s) in RCA: 1049] [Impact Index Per Article: 131.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Chemical methods developed over the past two decades enable preparation of colloidal nanocrystals with uniform size and shape. These Brownian objects readily order into superlattices. Recently, the range of accessible inorganic cores and tunable surface chemistries dramatically increased, expanding the set of nanocrystal arrangements experimentally attainable. In this review, we discuss efforts to create next-generation materials via bottom-up organization of nanocrystals with preprogrammed functionality and self-assembly instructions. This process is often driven by both interparticle interactions and the influence of the assembly environment. The introduction provides the reader with a practical overview of nanocrystal synthesis, self-assembly, and superlattice characterization. We then summarize the theory of nanocrystal interactions and examine fundamental principles governing nanocrystal self-assembly from hard and soft particle perspectives borrowed from the comparatively established fields of micrometer colloids and block copolymer assembly. We outline the extensive catalog of superlattices prepared to date using hydrocarbon-capped nanocrystals with spherical, polyhedral, rod, plate, and branched inorganic core shapes, as well as those obtained by mixing combinations thereof. We also provide an overview of structural defects in nanocrystal superlattices. We then explore the unique possibilities offered by leveraging nontraditional surface chemistries and assembly environments to control superlattice structure and produce nonbulk assemblies. We end with a discussion of the unique optical, magnetic, electronic, and catalytic properties of ordered nanocrystal superlattices, and the coming advances required to make use of this new class of solids.
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Affiliation(s)
- Michael A Boles
- Department of Chemistry and James Franck Institute, University of Chicago , Chicago, Illinois 60637, United States
| | - Michael Engel
- Institute for Multiscale Simulation, Friedrich-Alexander University Erlangen-Nürnberg , 91052 Erlangen, Germany.,Department of Chemical Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Dmitri V Talapin
- Department of Chemistry and James Franck Institute, University of Chicago , Chicago, Illinois 60637, United States.,Center for Nanoscale Materials, Argonne National Lab , Argonne, Illinois 60439, United States
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47
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Montemore MM, Andreussi O, Medlin JW. Hydrocarbon adsorption in an aqueous environment: A computational study of alkyls on Cu(111). J Chem Phys 2016; 145:074702. [PMID: 27544118 DOI: 10.1063/1.4961027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Hydrocarbon chains are important intermediates in various aqueous-phase surface processes, such as CO2 electroreduction, aqueous Fischer-Tropsch synthesis, and aqueous phase reforming of biomass-derived molecules. Further, the interaction between water and adsorbed hydrocarbons represents a difficult case for modern computational methods. Here, we explore various methods for calculating the energetics of this interaction within the framework of density functional theory and explore trade-offs between the use of low water coverages, molecular dynamics approaches, and minima hopping for identification of low energy structures. An effective methodology for simulating low temperature processes is provided by using a unit cell in which the vacuum space is filled with water, employing the minima hopping algorithm to search for low-lying minima, and including dispersion (van der Waals) interactions. Using this methodology, we show that a high coverage of adsorbed alkyls is destabilized by the presence of water, while a low coverage of alkyls is stabilized. Solvation has a small effect on the energetics of hydrocarbon chain growth, generally decreasing its favorability at low temperatures. We studied higher temperatures by running molecular dynamics simulations starting at the minima found by the minima hopping algorithm and found that increased temperatures facilitate chain growth. The self-consistent continuum solvation method effectively describes the alkyl-water interaction and is in general agreement with the explicit solvation results in most cases, but care should be taken at high alkyl coverage.
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Affiliation(s)
- Matthew M Montemore
- Department of Mechanical Engineering, University of Colorado Boulder, UCB 427, Boulder, Colorado 80309, USA
| | - Oliviero Andreussi
- Faculty of Informatics, Institute of Computational Science, Università della Svizzera Italiana, Via G. Buffi 13, 6904 Lugano, Switzerland
| | - J Will Medlin
- Department of Chemical and Biological Engineering, University of Colorado Boulder, UCB 596, Boulder, Colorado 80309, USA
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48
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Rezvantalab H, Shojaei-Zadeh S. Tilting and Tumbling of Janus Nanoparticles at Sheared Interfaces. ACS NANO 2016; 10:5354-5361. [PMID: 27124323 DOI: 10.1021/acsnano.6b01521] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We investigate the response of a single Janus nanoparticle adsorbed at an oil-water interface to imposed shear flows using molecular dynamics simulations. We consider particles of different geometry, including spheres, cylinders, and discs, and tune their degree of amphiphilicity by controlling the affinity of their two sides to the fluid phases. We observe that depending on the shape, amphiphilicity, and the applied shear rate, two modes of rotational dynamics takes place: a smooth tilt or a tumbling motion. We demonstrate that irrespective of this dynamic behavior, a steady-state orientation is eventually achieved as a result of the balance between the shear- and capillary-induced torques, which can be tuned by controlling the surface property and flow parameters. Our findings provide insight on using flow fields to tune particle orientation at an interface and to utilize it to direct their assembly into ordered monolayers.
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Affiliation(s)
- Hossein Rezvantalab
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey , 98 Brett Road, Piscataway, New Jersey 08854-8058, United States
| | - Shahab Shojaei-Zadeh
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey , 98 Brett Road, Piscataway, New Jersey 08854-8058, United States
- Institute for Advanced Materials, Devices and Nanotechnology , 607 Taylor Road, Piscataway, New Jersey 08854-8019, United States
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49
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Quan X, Peng C, Dong J, Zhou J. Structural properties of polymer-brush-grafted gold nanoparticles at the oil-water interface: insights from coarse-grained simulations. SOFT MATTER 2016; 12:3352-3359. [PMID: 26954721 DOI: 10.1039/c5sm02721g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, the structural properties of amphiphilic polymer-brush-grafted gold nanoparticles (AuNPs) at the oil-water interface were investigated by coarse-grained simulations. The effects of grafting architecture (diblock, mixed and Janus brush-grafted AuNPs) and hydrophilicity of polymer brushes are discussed. Simulation results indicate that functionalized AuNPs present abundant morphologies including typical core-shell, Janus-type, jellyfish-like, etc., in a water or oil-water solvent environment. It is found that hydrophobic/weak hydrophilic polymer-brush-grafted AuNPs have better phase transfer performance, especially for AuNPs modified with hydrophobic chains as outer blocks and weak hydrophilic chains as inner blocks. This kind of AuNP can cross the interface region and move into the oil phase completely. For hydrophobic/strong hydrophilic polymer-brush-grafted AuNPs, they are trapped in the interface region instead of moving into any phase. The mechanism of phase transfer is ascribed to the flexibility and mobility of outer blocks. Besides, we study the desorption energy by PMF analysis. The results demonstrate that Janus brush-grafted AuNPs show the highest interfacial stability and activity, which can be further strengthened by increasing the hydrophilicity of grafted polymer brushes. This work will promote the industrial applications of polymer-brush-grafted NPs such as phase transfer catalysis and Pickering emulsion catalysis.
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Affiliation(s)
- Xuebo Quan
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab for Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, P. R. China.
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Nieto-Draghi C, Fayet G, Creton B, Rozanska X, Rotureau P, de Hemptinne JC, Ungerer P, Rousseau B, Adamo C. A General Guidebook for the Theoretical Prediction of Physicochemical Properties of Chemicals for Regulatory Purposes. Chem Rev 2015; 115:13093-164. [PMID: 26624238 DOI: 10.1021/acs.chemrev.5b00215] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Carlos Nieto-Draghi
- IFP Energies nouvelles , 1 et 4 avenue de Bois-Préau, 92852 Rueil-Malmaison, France
| | - Guillaume Fayet
- INERIS, Parc Technologique Alata, BP2 , 60550 Verneuil-en-Halatte, France
| | - Benoit Creton
- IFP Energies nouvelles , 1 et 4 avenue de Bois-Préau, 92852 Rueil-Malmaison, France
| | - Xavier Rozanska
- Materials Design S.A.R.L. , 18, rue de Saisset, 92120 Montrouge, France
| | - Patricia Rotureau
- INERIS, Parc Technologique Alata, BP2 , 60550 Verneuil-en-Halatte, France
| | | | - Philippe Ungerer
- Materials Design S.A.R.L. , 18, rue de Saisset, 92120 Montrouge, France
| | - Bernard Rousseau
- Laboratoire de Chimie-Physique, Université Paris Sud , UMR 8000 CNRS, Bât. 349, 91405 Orsay Cedex, France
| | - Carlo Adamo
- Institut de Recherche Chimie Paris, PSL Research University, CNRS, Chimie Paristech , 11 rue P. et M. Curie, F-75005 Paris, France.,Institut Universitaire de France , 103 Boulevard Saint Michel, F-75005 Paris, France
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