1
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Owoseni O, Su Y, Raghavan S, Bose A, John VT. Hydrophobically modified chitosan biopolymer connects halloysite nanotubes at the oil-water interface as complementary pair for stabilizing oil droplets. J Colloid Interface Sci 2022; 620:135-143. [PMID: 35421750 DOI: 10.1016/j.jcis.2022.03.142] [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: 12/23/2021] [Revised: 03/21/2022] [Accepted: 03/30/2022] [Indexed: 10/18/2022]
Abstract
The integration of cationic and hydrophobic functionalities into hydrophobically modified chitosan (HMC) biopolymer facilitates complementary emulsion stabilization with negatively charged halloysite clay nanotubes (HNT). Oil-in-water emulsions with smaller droplet sizes and significantly improved interfacial resistance to droplet coalescence are obtained on complementary emulsion stabilization by HNT and HMC compared to the individual emulsifiers alone. Contact angle measurements shows that the adsorption of the cationic HMC onto the negatively charged HNT modifies the surface wettability of the nanotubes, facilitating the attachment of the nanotubes to the oil-water interface. High resolution cryo-SEM imaging reveals that free HMC chains locks the nanotubes together at the oil-water interface, creating a high barrier to droplet coalescence. The emulsion stability is an order of magnitude higher for conditions in which the aqueous HNT dispersion is stabilized by the HMC compared to conditions where the negatively charged HNT is strongly flocculated by the cationic HMC. The hydrophobic interaction between HMC chains, insertion of HMC hydrophobes into the oil phase and electrostatic interactions between HMC and HNT are proposed as key mechanisms driving the increased emulsion stability. For potential application as a dispersant system for crude oil spill treatment, the nanotubular morphology of HNT was further exploited for the encapsulation of the water-insoluble surfactant, sorbitan monooleate (Span 80). The HMC and HNT sterically strengthens the oil-water interfacial layer while release of the Span 80 surfactant from the HNT lumen lowers the oil-water interfacial tension. The concepts advanced here are relevant in the development of environmentally-benign dispersants for oil spill remediation.
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Affiliation(s)
- Olasehinde Owoseni
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, United States
| | - Yang Su
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, United States
| | - Srinivasa Raghavan
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States
| | - Arijit Bose
- Department of Chemical Engineering, University of Rhode Island, Kingston, RI 02881, United States
| | - Vijay T John
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, United States.
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2
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Haridharan N, Sundar D, Kurrupasamy L, Anandan S, Liu C, Wu JJ. Oil spills adsorption and cleanup by polymeric materials: A review. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5636] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Neelamegan Haridharan
- Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan
- Department of Chemistry Vel Tech Rangarajan Dr. Sagunthala R & D Institute of Science and Technology Avadi Tamilnadu India
| | - Dhivyasundar Sundar
- Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan
| | - Lakshmanan Kurrupasamy
- Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan
| | - Sambandam Anandan
- Department of Chemistry National Institute of Technology Trichy India
| | - Chen‐Hua Liu
- Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan
| | - Jerry J. Wu
- Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan
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3
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Ezzat A, Al-Lohedan HA, Atta AM. New Amphiphilic Tricationic Imidazolium and Pyridinium Ionic Liquids for Demulsification of Arabic Heavy Crude Oil Brine Emulsions. ACS OMEGA 2021; 6:5061-5073. [PMID: 33644615 PMCID: PMC7905954 DOI: 10.1021/acsomega.1c00188] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
Preparation of new green oilfield chemicals based on ionic liquids (ILs) having higher demulsification efficiency to solve the heavy crude oil brine water emulsions became a target in the petroleum research studies and industry. In the present work, the combination of pyridinium, imidazolium, and hydrophilic or hydrophobic moieties in the chemical structure of ILs has been investigated to improve the surface properties of ILs in both bulk solution and interfaces. Aminopyridine was quaternized with cetylbromide and condensed with glyoxal and 4-hydroxybenzaldehyde in acetic acid to prepare imidazolium-pyridinium bromide acetate ionic liquid (IPy-IL). The phenol group of IPy-IL was etherified with tetraethylene glycol to alter its amphiphilicity and synthesize new amphiphiles (AIPy-IL). Their chemical structure, thermal characteristics, and stabilities were characterized. Their aqueous solution performance in seawater was evaluated to investigate their surface activity, aggregation particle sizes, and surface charges. The demulsification performances of the prepared Arabic heavy crude oil seawater emulsions in the presence of different concentrations of IPy-IL and AIPy-IL were evaluated and proved by interfacial tension, particle size, and demulsification efficiencies at a temperature of 45 °C. The data concluded that AIPy-IL was an effective demulsifier for different crude oil seawater emulsion compositions at a low injection dose and temperature of 100 ppm and 45 °C, which were not report elsewhere.
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4
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Ma Y, Wu Y, Lee JG, He L, Rother G, Fameau AL, Shelton WA, Bharti B. Adsorption of Fatty Acid Molecules on Amine-Functionalized Silica Nanoparticles: Surface Organization and Foam Stability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3703-3712. [PMID: 32202121 PMCID: PMC7311077 DOI: 10.1021/acs.langmuir.0c00156] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 03/20/2020] [Indexed: 05/25/2023]
Abstract
The crucial roles of the ionization state and counterion presence on the phase behavior of fatty acid in aqueous solutions are well-established. However, the effects of counterions on the adsorption and morphological state of fatty acid on nanoparticle surfaces are largely unknown. This knowledge gap exists due to the high complexity of the interactions between nanoparticles, counterions, and fatty acid molecules in aqueous solution. In this study, we use adsorption isotherms, small angle neutron scattering, and all-atom molecular dynamic simulations to investigate the effect of addition of ethanolamine as a counterion on the adsorption and self-assembly of decanoic acid onto aminopropyl-modified silica nanoparticles. We show that the morphology of the fatty acid assemblies on silica nanoparticles changes from discrete surface patches to a continuous bilayer by increasing concentration of the counterion. This morphological behavior of fatty acid on the oppositely charged nanoparticle surface alters the interfacial activity of the fatty acid-nanoparticle complex and thus governs the stability of the foam formed by the mixture. Our study provides new insights into the structure-property relationship of fatty acid-nanoparticle complexes and outlines a framework to program the stability of foams formed by mixtures of nanoparticles and amphiphiles.
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Affiliation(s)
- Yingzhen Ma
- Cain
Department of Chemical Engineering, Louisiana
State University, Baton
Rouge, Louisiana 70803, United States
| | - Yao Wu
- Cain
Department of Chemical Engineering, Louisiana
State University, Baton
Rouge, Louisiana 70803, United States
| | - Jin Gyun Lee
- Cain
Department of Chemical Engineering, Louisiana
State University, Baton
Rouge, Louisiana 70803, United States
| | - Lilin He
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gernot Rother
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Anne-Laure Fameau
- National
Institute of French Agriculture Research, Nantes 44300, France
| | - William A. Shelton
- Cain
Department of Chemical Engineering, Louisiana
State University, Baton
Rouge, Louisiana 70803, United States
- Center
for Computation and Technology, Louisiana
State University, Baton
Rouge, Louisiana 70803, United States
| | - Bhuvnesh Bharti
- Cain
Department of Chemical Engineering, Louisiana
State University, Baton
Rouge, Louisiana 70803, United States
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5
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Poling-Skutvik R, Slim AH, Narayanan S, Conrad JC, Krishnamoorti R. Soft Interactions Modify the Diffusive Dynamics of Polymer-Grafted Nanoparticles in Solutions of Free Polymer. ACS Macro Lett 2019; 8:917-922. [PMID: 35619487 DOI: 10.1021/acsmacrolett.9b00294] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We examine the dynamics of silica particles grafted with high molecular weight polystyrene suspended in semidilute solutions of chemically similar linear polymer using X-ray photon correlation spectroscopy. The particle dynamics decouple from the bulk viscosity despite their large hydrodynamic size and instead experience an effective viscosity that depends on the molecular weight of the free polymer chains. Unlike for hard-sphere nanoparticles in semidilute polymer solutions, the diffusivities of the polymer-grafted nanoparticles do not collapse onto a master curve solely as a function of normalized length scales. Instead, the diffusivities can be collapsed across two orders of magnitude in free polymer molecular weight and concentration and one order of magnitude in grafted molecular weight by incorporating the ratio of free to grafted polymer molecular weights. These results suggest that the soft interaction potential between polymer-grafted nanoparticles and free polymer allows polymer-grafted nanoparticles to diffuse faster than predicted based on bulk rheology and modifies the coupling between grafted particle dynamics and the relaxations of the surrounding free polymer.
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Affiliation(s)
- Ryan Poling-Skutvik
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Ali H. Slim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Suresh Narayanan
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Jacinta C. Conrad
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Ramanan Krishnamoorti
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
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6
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Orodu KB, Afolabi RO, Oluwasijuwomi TD, Orodu OD. Effect of aluminum oxide nanoparticles on the rheology and stability of a biopolymer for enhanced oil recovery. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.141] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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7
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Tilton RD. Opportunities for complex fluids engineering
w
ith nanoparticulate polymer brushes. AIChE J 2018. [DOI: 10.1002/aic.16427] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Robert D. Tilton
- Center for Complex Fluids Engineering, Dept. of Chemical Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213
- Center for Complex Fluids Engineering, Dept. of Biomedical Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213
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8
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Gbadamosi AO, Junin R, Manan MA, Yekeen N, Agi A, Oseh JO. Recent advances and prospects in polymeric nanofluids application for enhanced oil recovery. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.05.020] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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9
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Wu D, Honciuc A. Contrasting Mechanisms of Spontaneous Adsorption at Liquid-Liquid Interfaces of Nanoparticles Constituted of and Grafted with pH-Responsive Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6170-6182. [PMID: 29730929 DOI: 10.1021/acs.langmuir.8b00877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Elucidating the mechanisms responsible for spontaneous adsorption of nanoparticles (NPs) at interfaces is important for their application as emulsifiers, bubble stabilizers, or foaming agents. In order to investigate the key factors that control the spontaneous adsorption of NPs at liquid-liquid interfaces, we synthesized seven different types of NPs from pH-responsive polymers poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA) and poly(2-dimethylamino)ethyl methacrylate) (PDMAEMA) via surfactant-free emulsion polymerization or via "grafting from" polystyrene (PS) NPs. The dynamic interfacial tension (IFT) measurements at the toluene-water (Tol-H2O) interface reveal that when PDEAEMA and PDMAEMA are grafted from the surface of PS NPs the solubility of the grafted pH-responsive polymers in toluene is the key factor determining the NPs' interfacial adsorption. Under acidic conditions (pH < 6.0), PDEAEMA and PDMAEMA are protonated and show no solubility in toluene, and as a result, the grafted NPs do not adsorb at the Tol-H2O interface. Oppositely, under basic conditions (pH > 7.0), PDMAEMA dissolves in toluene and therefore the PDMAEMA-grafted NPs can adsorb at the Tol-H2O interface. Interestingly, when NPs are constituted of PDEAEMA, they can adsorb spontaneously at the Tol-H2O interface under acidic conditions (pH < 6.0) but not under basic conditions (pH > 7.0). In this case, the key factor determining the NPs' spontaneous adsorption at the Tol-H2O interface is the degree of softness of the NPs rather than the solubility of PDEAEMA in toluene. Furthermore, we found that the adsorption of NPs constituted of PDEAEMA- (pH 2.0-6.0) and PDMAEMA-grafted PS NPs (pH 7.0-10.0) at the Tol-H2O interface is a combination of diffusion-controlled and energy-barrier-controlled. The opposite trends observed for the interfacial attachment Δ E and activation energies Ea for the "constituted of" and "grafted from" NPs with pH suggest an opposite mechanisms of adsorption at the Tol-H2O interface. Finally, the synthesized NPs prove to be effective emulsifiers, where the phase of the Pickering emulsions can be changed dynamically by pH adjustment.
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Affiliation(s)
- Dalin Wu
- Institute of Chemistry and Biotechnology , Zurich University of Applied Sciences , Einsiedlerstrasse 31 , 8820 Waedenswil , Switzerland
| | - Andrei Honciuc
- Institute of Chemistry and Biotechnology , Zurich University of Applied Sciences , Einsiedlerstrasse 31 , 8820 Waedenswil , Switzerland
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10
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Riley JK, Matyjaszewski K, Tilton RD. Friction and adhesion control between adsorbed layers of polyelectrolyte brush-grafted nanoparticles via pH-triggered bridging interactions. J Colloid Interface Sci 2018; 526:114-123. [PMID: 29723792 DOI: 10.1016/j.jcis.2018.04.082] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 04/18/2018] [Accepted: 04/21/2018] [Indexed: 11/19/2022]
Abstract
HYPOTHESIS Adsorption of polyelectrolyte brush-grafted nanoparticles (BGNPs) produces a heterogeneous interface with sub-monolayer surface coverage resulting from lateral electrostatic repulsions that limit packing. As a result, the interaction forces between opposing BGNP layers include an adhesive cross-surface BGNP-substrate bridging force that depends on the interparticle spacing, particle size, and strength of electrostatic interactions. We hypothesize that BGNPs with pH-responsive, annealed polyelectrolyte brushes can undergo controlled changes in surface area coverage through post-adsorption swelling or de-swelling into non-equilibrium layer conformations and that such changes in surface coverage can switch off or switch on particle intercalation, bridging attractions, and enhanced energy dissipation upon sliding. This work aims to characterize the nature of surface forces in heterogeneous BGNP adsorbed layers and to utilize pH-sensitive bridging forces as a mechanism to tune friction and adhesion. EXPERIMENTS Colloidal probe atomic force microscopy (CP-AFM) is used to measure normal and lateral forces between negatively charged silica surfaces with adsorbed pH-responsive cationic BGNPs. The BGNPs are poly(2-dimethylaminoethyl methacrylate) brush-grafted silica nanoparticles. Adhesion force and friction analysis is complemented by simultaneous quartz-crystal microbalance and ellipsometry measurements under conditions that render the particles strongly charged and swollen (acidic) or weakly charged and de-swollen (basic). FINDINGS Adsorbed BGNPs can be swollen or de-swollen via pH rinses, enabling direct control of surface coverage and bridging interactions. Transitions from adhesive bridging contacts with high friction to non-adhesive contacts with low friction forces occur when adsorbed BGNP layers are switched from a de-swollen/weakly charged state to a swollen/highly charged state. The ability to controllably shift the character of normal and lateral forces via coverage-mediated bridging interactions is a unique feature of adsorbed nanoparticulate brush constructs and highlights their potential to condition surfaces with additional functionality compared to dense, planar homopolymer brushes.
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Affiliation(s)
- John K Riley
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Robert D Tilton
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States; Department of Biomedical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States.
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11
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Liu S, Wang H, Akcora P. Ordering Polymer‐Grafted Nanoparticles at Oil–Air Interfaces under Magnetic Fields. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Siqi Liu
- Department of Chemical Engineering and Materials Science Castle Point on Hudson Stevens Institute of Technology Hoboken NJ 07030 USA
| | - Haoyu Wang
- Department of Chemical Engineering and Materials Science Castle Point on Hudson Stevens Institute of Technology Hoboken NJ 07030 USA
| | - Pinar Akcora
- Department of Chemical Engineering and Materials Science Castle Point on Hudson Stevens Institute of Technology Hoboken NJ 07030 USA
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12
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Shehzad F, Hussein IA, Kamal MS, Ahmad W, Sultan AS, Nasser MS. Polymeric Surfactants and Emerging Alternatives used in the Demulsification of Produced Water: A Review. POLYM REV 2017. [DOI: 10.1080/15583724.2017.1340308] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Farrukh Shehzad
- Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
| | | | - Muhammad Shahzad Kamal
- Center for Integrative Petroleum Research, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
| | - Waqar Ahmad
- Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
- Department of Chemical Engineering, Monash University, Clayton, Australia
| | - Abdullah S. Sultan
- Petroleum Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
| | - Mustafa S. Nasser
- Gas Processing Center, College of Engineering, Qatar University, Doha, Qatar
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13
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Studies on interfacial and rheological properties of water soluble polymer grafted nanoparticle for application in enhanced oil recovery. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2016.10.021] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Huang YR, Lamson M, Matyjaszewski K, Tilton RD. Enhanced interfacial activity of multi-arm poly(ethylene oxide) star polymers relative to linear poly(ethylene oxide) at fluid interfaces. Phys Chem Chem Phys 2017; 19:23854-23868. [DOI: 10.1039/c7cp02841e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interfacial tension reduction, dynamic dilatational elasticity and extent of adsorption were investigated for linear poly(ethylene oxide) (PEO) chains of varying molecular weight and for PEO star polymers with an average of 64 arms per star at air/water, xylene/water, and cyclohexane/water interfaces.
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Affiliation(s)
- Yun-Ru Huang
- Center for Complex Fluids Engineering
- Department of Chemical Engineering
- Carnegie Mellon University
- Pittsburgh
- USA
| | - Melissa Lamson
- Center for Complex Fluids Engineering
- Department of Chemistry
- Carnegie Mellon University
- Pittsburgh
- USA
| | - Krzysztof Matyjaszewski
- Center for Complex Fluids Engineering
- Department of Chemistry
- Carnegie Mellon University
- Pittsburgh
- USA
| | - Robert D. Tilton
- Center for Complex Fluids Engineering
- Department of Chemical Engineering
- Carnegie Mellon University
- Pittsburgh
- USA
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15
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Zhang Y, Shitta A, Meredith JC, Behrens SH. Bubble Meets Droplet: Particle-Assisted Reconfiguration of Wetting Morphologies in Colloidal Multiphase Systems. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:3309-3319. [PMID: 27167839 DOI: 10.1002/smll.201600799] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Indexed: 06/05/2023]
Abstract
Wetting phenomena are ubiquitous in nature and play key functions in various industrial processes and products. When a gas bubble encounters an oil droplet in an aqueous medium, it can experience either partial wetting or complete engulfment by the oil. Each of these morphologies can have practical benefits, and controlling the morphology is desirable for applications ranging from particle synthesis to oil recovery and gas flotation. It is known that the wetting of two fluids within a fluid medium depends on the balance of interfacial tensions and can thus be modified with surfactant additives. It is reported that colloidal particles, too, can be used to promote both wetting and dewetting in multifluid systems. This study demonstrates the surfactant-free tuning and dynamic reconfiguration of bubble-droplet morphologies with the help of cellulosic particles. It further shows that the effect can be attributed to particle adsorption at the fluid interfaces, which can be probed by interfacial tensiometry, making particle-induced transitions in the wetting morphology predictable. Finally, particle adsorption at different rates to air-water and oil-water interfaces can even lead to slow, reentrant wetting behavior not familiar from particle-free systems.
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Affiliation(s)
- Yi Zhang
- School of Chemical & Biomoelcular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0100, USA
| | - Abiola Shitta
- School of Chemical & Biomoelcular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0100, USA
| | - J Carson Meredith
- School of Chemical & Biomoelcular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0100, USA
| | - Sven H Behrens
- School of Chemical & Biomoelcular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0100, USA
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16
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Riley JK, An J, Tilton RD. Ionic Surfactant Binding to pH-Responsive Polyelectrolyte Brush-Grafted Nanoparticles in Suspension and on Charged Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13680-13689. [PMID: 26649483 DOI: 10.1021/acs.langmuir.5b03757] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The interactions between silica nanoparticles grafted with a brush of cationic poly(2-(dimethylamino) ethyl methacrylate) (SiO2-g-PDMAEMA) and anionic surfactant sodium dodecyl sulfate (SDS) is investigated by dynamic light scattering, electrophoretic mobility, quartz crystal microbalance with dissipation, ellipsometry, and atomic force microscopy. SiO2-g-PDMAEMA exhibits pH-dependent charge and size properties which enable the SDS binding to be probed over a range of electrostatic conditions and brush conformations. SDS monomers bind irreversibly to SiO2-g-PDMAEMA at low surfactant concentrations (∼10(-4) M) while exhibiting a pH-dependent threshold above which cooperative, partially reversible SDS binding occurs. At pH 5, SDS binding induces collapse of the highly charged and swollen brush as observed in the bulk by DLS and on surfaces by QCM-D. Similar experiments at pH 9 suggest that SDS binds to the periphery of the weakly charged and deswollen brush and produces SiO2-g-PDMAEMA/SDS complexes with a net negative charge. SiO2-g-PDMAEMA brush collapse and charge neutralization is further confirmed by colloidal probe AFM measurements, where reduced electrosteric repulsions and bridging adhesion are attributed to effects of the bound SDS. Additionally, sequential adsorption schemes with SDS and SiO2-g-PDMAEMA are used to enhance deposition relative to SiO2-g-PDMAEMA direct adsorption on silica. This work shows that the polyelectrolyte brush configuration responds in a more dramatic fashion to SDS than to pH-induced changes in ionization, and this can be exploited to manipulate the structure of adsorbed layers and the corresponding forces of compression and friction between opposing surfaces.
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Affiliation(s)
| | - Junxue An
- KTH Royal Institute of Technology , School of Chemical Science and Engineering, Department of Chemistry, Surface and Corrosion Science, Stockholm SE-100 44, Sweden
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17
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Owoseni O, Zhang Y, Su Y, He J, McPherson GL, Bose A, John VT. Tuning the Wettability of Halloysite Clay Nanotubes by Surface Carbonization for Optimal Emulsion Stabilization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13700-13707. [PMID: 26633133 DOI: 10.1021/acs.langmuir.5b03878] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The carbonization of hydrophilic particle surfaces provides an effective route for tuning particle wettability in the preparation of particle-stabilized emulsions. The wettability of naturally occurring halloysite clay nanotubes (HNT) is successfully tuned by the selective carbonization of the negatively charged external HNT surface. The positively charge chitosan biopolymer binds to the negatively charged external HNT surface by electrostatic attraction and hydrogen bonding, yielding carbonized halloysite nanotubes (CHNT) on pyrolysis in an inert atmosphere. Relative to the native HNT, the oil emulsification ability of the CHNT at intermediate levels of carbonization is significantly enhanced due to the thermodynamically more favorable attachment of the particles at the oil-water interface. Cryogenic scanning electron microscopy (cryo-SEM) imaging reveals that networks of CHNT attach to the oil-water interface with the particles in a side-on orientation. The concepts advanced here can be extended to other inorganic solids and carbon sources for the optimal design of particle-stabilized emulsions.
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Affiliation(s)
| | | | | | | | | | - Arijit Bose
- Department of Chemical Engineering, University of Rhode Island , Kingston, Rhode Island 02881, United States
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18
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Kim D, Krishnamoorti R. Interfacial Activity of Poly[oligo(ethylene oxide)–monomethyl ether methacrylate]-Grafted Silica Nanoparticles. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b00105] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daehak Kim
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Ramanan Krishnamoorti
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
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19
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Estridge CE, Jayaraman A. Diblock Copolymer Grafted Particles as Compatibilizers for Immiscible Binary Homopolymer Blends. ACS Macro Lett 2015; 4:155-159. [PMID: 35596427 DOI: 10.1021/mz500793e] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Using coarse-grained molecular simulations we study AB diblock copolymer grafted particles (DBCGPs) as compatibilizers in an immiscible blend of A and B homopolymers. The fraction of the A block in the graft, fA, tunes the location of the DBCGPs within the blend. When fA = 0.25, the DBCGPs preferentially localize in the B domain of the blend, and when fA = 0.5 and 0.75, the DBCGPs localize at/near the interface of the A and B domains, adopting conformations that segregate the A and B segments of the grafts into chemically identical domains of the blend. The desorption energy to leave the interface and the drop in interfacial tension are larger for the DBCGP than ungrafted diblock copolymers, commonly used as compatibilizers. Additionally, the comparable reduction in interfacial tension of DBCGPs as Janus-homopolymer grafted particles, along with the easier synthesis routes of DBCGP, makes DBCGP an attractive alternative class of compatibilizers for polymer blends.
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Affiliation(s)
- Carla E. Estridge
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Arthi Jayaraman
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States
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Koski J, Chao H, Riggleman RA. Predicting the structure and interfacial activity of diblock brush, mixed brush, and Janus-grafted nanoparticles. Chem Commun (Camb) 2015; 51:5440-3. [DOI: 10.1039/c4cc08659g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We develop a field theoretic simulation model to study the interfacial properties of grafted nanoparticles as a function of the grafting architecture.
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Affiliation(s)
- Jason Koski
- Department of Chemical and Biomolecular Engineering
- University of Pennsylvania
- Philadelphia, PA
- USA
| | - Huikuan Chao
- Department of Chemical and Biomolecular Engineering
- University of Pennsylvania
- Philadelphia, PA
- USA
| | - Robert A. Riggleman
- Department of Chemical and Biomolecular Engineering
- University of Pennsylvania
- Philadelphia, PA
- USA
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Yu G, Dong J, Foster LM, Metaxas AE, Truskett TM, Johnston KP. Breakup of Oil Jets into Droplets in Seawater with Environmentally Benign Nanoparticle and Surfactant Dispersants. Ind Eng Chem Res 2014. [DOI: 10.1021/ie503658h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Guangzhe Yu
- McKetta Chemical Engineering
Department, University of Texas, Austin, Texas 78712-1589, United States
| | - Jiannan Dong
- McKetta Chemical Engineering
Department, University of Texas, Austin, Texas 78712-1589, United States
| | - Lynn M. Foster
- McKetta Chemical Engineering
Department, University of Texas, Austin, Texas 78712-1589, United States
| | - Athena E. Metaxas
- McKetta Chemical Engineering
Department, University of Texas, Austin, Texas 78712-1589, United States
| | - Thomas M. Truskett
- McKetta Chemical Engineering
Department, University of Texas, Austin, Texas 78712-1589, United States
| | - Keith P. Johnston
- McKetta Chemical Engineering
Department, University of Texas, Austin, Texas 78712-1589, United States
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Sun J, Yi C, Wei W, Zhao D, Hu Q, Liu X. Nanohybrids from direct chemical self-assembly of poly(styrene-alt-maleic anhydride) as pH-responsive particulate emulsifiers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:14757-14764. [PMID: 25423487 DOI: 10.1021/la504281b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The nanohybrid particulate emulsifiers based on poly(styrene-alt-maleic anhydride) (SMA) were facilely prepared via the direct chemical self-assembly triggered by the aminolysis of SMA with 3-aminopropyltriethoxysilane (APTES) and the in situ polycondensation of APTES under refluxing in acetone. Transmission electron microscopy and scanning electron microscopy confirmed the spherical-like morphology of the nanohybrids. Dynamic light scattering and electrophoresis revealed the structure transition of the nanohybrids in response to pH change. The emulsification study showed that the nanohybrids were effective particulate emulsifiers when homogenized with various oils including toluene, paraffin oil, silicone oil, isooctyl palmitate, dicaprylyl carbonate, and propylheptyl caprylate. The nanohybrid particulate emulsifiers exhibited pH-sensitivity, and the diameter of paraffin oil droplets remarkably increased with pH of the nanohybrid aqueous dispersion decrease. Also, the reduced dynamic interfacial tension predicted the thermodynamically unstable state of the emulsions prepared at high pH values. Most interesting, the paraffin oil-in-water high internal phase emulsions (HIPEs) with a high oil volume fraction of 83.3% were formed when the nanohybrids were heavily flocculated by adding HCl. The HIPEs were pH-responsive and capable of demulsification with the addition of an alkaline solution showing a potential application in the oil industry.
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Affiliation(s)
- Jianhua Sun
- Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University , Wuxi 214122, China
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