1
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Biro RA, Tyrode EC, Thormann E. Reducing Ice Adhesion to Polyelectrolyte Surfaces by Counterion-Mediated Nonfrozen Hydration Water. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38602190 DOI: 10.1021/acsami.4c02434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Hydrophilic anti-icing coatings can be energy-effective passive solutions for combating ice accretion and reducing ice adhesion. However, their underlying mechanisms of action remain inferential and are ill-defined from a molecular perspective. Here, we systematically investigate the influence of the counterion identity on the shear ice adhesion strength to cationic polymer coatings having quaternary alkyl ammonium moieties as chargeable groups. Temperature-dependent molecular information on the hydrated polymer films is obtained using total internal reflection (TIR) Raman spectroscopy, complemented with differential scanning calorimetry (DSC) and ellipsometry. Ice adhesion measurements show a pronounced counterion-specific behavior with a sharp increase in adhesion at temperatures that depend on the anion identity, following the order Cl- < F- < SCN- < Br- < I-. Linked to the freezing of hydration water, the specific ordering results from differences in ion pairing and the amount of water present within the polymer film. Moreover, similar effects can be promoted by varying the cross-linking density in the coating while keeping the anion identity fixed. These findings shed new light on low ice adhesion mechanisms and may inspire novel approaches for improved anti-icing coatings.
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Affiliation(s)
- Robert A Biro
- Department of Chemistry, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Eric C Tyrode
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Esben Thormann
- Department of Chemistry, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
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2
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Su X, Wan Z, Lu Y, Rojas O. Control of the Colloidal and Adsorption Behaviors of Chitin Nanocrystals and an Oppositely Charged Surfactant at Solid, Liquid, and Gas Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4881-4892. [PMID: 38386001 DOI: 10.1021/acs.langmuir.3c03787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Chitin has a unique hierarchical structure, spanning the macro- and nanoscales, and presents chemical characteristics that make it a suitable component of multiphase systems. Herein, we elucidate the colloidal interactions between partially deacetylated chitin nanocrystals (cationic ChNC) and an anionic surfactant, sodium dodecyl sulfate (SDS). We investigate charge neutralization and association (electrophoretic mobility, surface tensiometry, and quartz crystal microgravimetry) and their role in the stabilization of Pickering emulsions. We find SDS adsorption and association with ChNC under distinctive regimes: At low SDS concentration, submonolayer assemblies form on ChNC, driven by the hydrophobic effect and electrostatic interactions. With the increased SDS concentration, bilayers or patchy bilayers form, followed by adsorbed hemimicelles and micelles. We further suggested the role of hydrophobic effects in the observed colloidal transitions and complex conformations. At the highest SDS concentration tested, charge neutralization and SDS/ChNC flocculation take place. Remarkably, at given concentrations, adsorbed SDS endows the chitin nanoparticles with an effective hydrophobicity that opens the opportunity to achieve tailorable Pickering stabilization. Hence, a facile route is proposed by in situ modification by SDS physisorption, which extends the potential of renewable nanoparticles in the formulation of complex fluids, for instance, those relevant to household and healthcare products.
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Affiliation(s)
- Xiaoya Su
- Bioproducts Institute, Department of Chemical and Biological Engineering, University of British Columbia, 2360 E Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Zhangmin Wan
- Bioproducts Institute, Department of Chemical and Biological Engineering, University of British Columbia, 2360 E Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Yi Lu
- Bioproducts Institute, Department of Chemical and Biological Engineering, University of British Columbia, 2360 E Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Orlando Rojas
- Bioproducts Institute, Department of Chemical and Biological Engineering, University of British Columbia, 2360 E Mall, Vancouver, British Columbia V6T 1Z3, Canada
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
- Department of Wood Science, University of British Columbia, Vancouver, 2424 Main Mall 2900, Vancouver, British Columbia V6T 1Z4, Canada
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3
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Xu L, Ye R, Mavrikakis M, Chen P. Molecular-scale Insights into Cooperativity Switching of xTAB Adsorption on Gold Nanoparticles. ACS CENTRAL SCIENCE 2024; 10:65-76. [PMID: 38292618 PMCID: PMC10823513 DOI: 10.1021/acscentsci.3c01075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/12/2023] [Accepted: 11/27/2023] [Indexed: 02/01/2024]
Abstract
Quantifying adsorption behaviors is crucial for various applications such as catalysis, separation, and sensing, yet it is generally challenging to access in solution. Here, we report a combined experimental and computational study of the adsorption behaviors of alkyl-trimethylammonium bromides (xTAB), a class of ligands important for colloidal nanoparticle stabilization and shape control, with various alkyl chain lengths x on Au nanoparticles. We use density functional theory (DFT) to calculate xTAB binding energies on Au{111} and Au{110} surfaces with standing-up and lying-down configurations, which provides insights into the adsorption affinity and cooperativity differences of xTAB on these two facets. We demonstrate the key role of van der Waals interactions in determining the xTAB adsorption behavior. These computational results predict and explain the experimental discovery of xTAB's adsorption behavior switch from stronger affinity, negative cooperativity to weaker affinity, positive cooperativity when the concentration of xTAB increases in solution. We also show that in the standing-up configuration, bilayer adsorption may occur on both facets, which can lead to different differential binding energies and consequently adsorption crossover between the two facets when the ligand concentration increases. Our combined experimental and computational approaches demonstrate a paradigm for gaining molecular-scale insights into adsorbate-surface interactions.
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Affiliation(s)
- Lang Xu
- Department
of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Rong Ye
- Department
of Chemistry and Chemical Biology, Cornell
University, Ithaca, New York 14853, United States
| | - Manos Mavrikakis
- Department
of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Peng Chen
- Department
of Chemistry and Chemical Biology, Cornell
University, Ithaca, New York 14853, United States
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4
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Chang H, Lozier EH, Ma E, Geiger FM. Quantification of Stern Layer Water Molecules, Total Potentials, and Energy Densities at Fused Silica:Water Interfaces for Adsorbed Alkali Chlorides, CTAB, PFOA, and PFAS. J Phys Chem A 2023; 127:8404-8414. [PMID: 37775181 DOI: 10.1021/acs.jpca.3c04434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2023]
Abstract
We have employed amplitude- and phase-resolved second-harmonic generation spectroscopy to investigate ion-specific effects of monovalent cations at the fused silica:water interface maintained under acidic, neutral, and alkaline conditions. We find a negligible dependence of the total potential (as negative as -400 mV at pH 14), the second-order nonlinear susceptibility (as large as 1.5 × 10-21 m2 V-1 at pH 14), the number of Stern layer water molecules (1 × 1015 cm-2 at pH 5.8), and the energy associated with water alignment upon going from neutral to high pH (ca. -24 kJ mol-1 to -48 kJ mol-1 at pH 13 and 14, close to the cohesive energy of liquid water but smaller than that of ice) on chlorides of the alkali series (M+ = Li+, Na+, K+, Rb+, and Cs+). Attempts are presented to provide estimates for the molecular hyperpolarizability of the cations and anions in the Stern layer at high pH, which arrive at ca. 20-fold larger values for αtotal ions(2) = αM+(2) + αOH-(2) + αCl-(2) when compared to water's molecular hyperpolarizability estimate from theory and point to a sizable contribution of deprotonated silanol groups at high pH. In contrast to the alkali series, a pronounced dependence of the total potential and the second-order nonlinear susceptibility on monovalent cationic (cetrimonium bromide, CTAB) and anionic (perfluorooctanoic and perfluorooctanesulfonic acid, PFOA and PFOS) surfactants was quantifiable. Our findings are consistent with a low surface coverage of the alkali cations and a high surface coverage of the surfactants. Moreover, they underscore the important contribution of Stern layer water molecules to the total potential and second-order nonlinear susceptibility. Finally, they demonstrate the applicability of heterodyne-detected second-harmonic generation spectroscopy for identifying perfluorinated acids at mineral:water interfaces.
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Affiliation(s)
- HanByul Chang
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Emilie H Lozier
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Emily Ma
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Franz M Geiger
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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5
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Weiand E, Rodriguez-Ropero F, Roiter Y, Koenig PH, Angioletti-Uberti S, Dini D, Ewen JP. Effects of surfactant adsorption on the wettability and friction of biomimetic surfaces. Phys Chem Chem Phys 2023; 25:21916-21934. [PMID: 37581271 DOI: 10.1039/d3cp02546b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
The properties of solid-liquid interfaces can be markedly altered by surfactant adsorption. Here, we use molecular dynamics (MD) simulations to study the adsorption of ionic surfactants at the interface between water and heterogeneous solid surfaces with randomly arranged hydrophilic and hydrophobic regions, which mimic the surface properties of human hair. We use the coarse-grained MARTINI model to describe both the hair surfaces and surfactant solutions. We consider negatively-charged virgin and bleached hair surface models with different grafting densities of neutral octadecyl and anionic sulfonate groups. The adsorption of cationic cetrimonium bromide (CTAB) and anionic sodium dodecyl sulfate (SDS) surfactants from water are studied above the critical micelle concentration. The simulated adsorption isotherms suggest that cationic surfactants adsorb to the surfaces via a two-stage process, initially forming monolayers and then bilayers at high concentrations, which is consistent with previous experiments. Anionic surfactants weakly adsorb via hydrophobic interactions, forming only monolayers on both virgin and medium bleached hair surfaces. We also conduct non-equilibrium molecular dynamics simulations, which show that applying cationic surfactant solutions to bleached hair successfully restores the low friction seen with virgin hair. Friction is controlled by the combined surface coverage of the grafted lipids and the adsorbed CTAB molecules. Treated surfaces containing monolayers and bilayers both show similar friction, since the latter are easily removed by compression and shear. Further wetting MD simulations show that bleached hair treated with CTAB increases the hydrophobicity to similar levels seen for virgin hair. Treated surfaces containing CTAB monolayers with the tailgroups pointing predominantly away from the surface are more hydrophobic than bilayers due to the electrostatic interactions between water molecules and the exposed cationic headgroups.
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Affiliation(s)
- Erik Weiand
- Department of Mechanical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK.
- Institute of Molecular Science and Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
- Thomas Young Centre for the Theory and Simulation of Materials, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
| | - Francisco Rodriguez-Ropero
- Corporate Functions Analytical and Data & Modeling Sciences, Mason Business Center, The Procter and Gamble Company, Mason, 45040 Ohio, USA
| | - Yuri Roiter
- Corporate Functions Analytical and Data & Modeling Sciences, Mason Business Center, The Procter and Gamble Company, Mason, 45040 Ohio, USA
| | - Peter H Koenig
- Corporate Functions Analytical and Data & Modeling Sciences, Mason Business Center, The Procter and Gamble Company, Mason, 45040 Ohio, USA
| | - Stefano Angioletti-Uberti
- Institute of Molecular Science and Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
- Thomas Young Centre for the Theory and Simulation of Materials, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
- Department of Materials, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
| | - Daniele Dini
- Department of Mechanical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK.
- Institute of Molecular Science and Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
- Thomas Young Centre for the Theory and Simulation of Materials, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
| | - James P Ewen
- Department of Mechanical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK.
- Institute of Molecular Science and Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
- Thomas Young Centre for the Theory and Simulation of Materials, Imperial College London, South Kensington Campus, SW7 2AZ London, UK
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6
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Kim J, Martin OJF. Trap-and-Track for Characterizing Surfactants at Interfaces. Molecules 2023; 28:molecules28062859. [PMID: 36985832 PMCID: PMC10058797 DOI: 10.3390/molecules28062859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/18/2023] [Accepted: 03/18/2023] [Indexed: 03/30/2023] Open
Abstract
Understanding the behavior of surfactants at interfaces is crucial for many applications in materials science and chemistry. Optical tweezers combined with trajectory analysis can become a powerful tool for investigating surfactant characteristics. In this study, we perform trap-and-track analysis to compare the behavior of cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC) at water-glass interfaces. We use optical tweezers to trap a gold nanoparticle and statistically analyze the particle's movement in response to various surfactant concentrations, evidencing the rearrangement of surfactants adsorbed on glass surfaces. Our results show that counterions have a significant effect on surfactant behavior at the interface. The greater binding affinity of bromide ions to CTA+ micelle surfaces reduces the repulsion among surfactant head groups and enhances the mobility of micelles adsorbed on the interface. Our study provides valuable insights into the behavior of surfactants at interfaces and highlights the potential of optical tweezers for surfactant research. The development of this trap-and-track approach can have important implications for various applications, including drug delivery and nanomaterials.
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Affiliation(s)
- Jeonghyeon Kim
- Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Olivier J F Martin
- Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), 1015 Lausanne, Switzerland
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7
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Solhi L, Guccini V, Heise K, Solala I, Niinivaara E, Xu W, Mihhels K, Kröger M, Meng Z, Wohlert J, Tao H, Cranston ED, Kontturi E. Understanding Nanocellulose-Water Interactions: Turning a Detriment into an Asset. Chem Rev 2023; 123:1925-2015. [PMID: 36724185 PMCID: PMC9999435 DOI: 10.1021/acs.chemrev.2c00611] [Citation(s) in RCA: 41] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Modern technology has enabled the isolation of nanocellulose from plant-based fibers, and the current trend focuses on utilizing nanocellulose in a broad range of sustainable materials applications. Water is generally seen as a detrimental component when in contact with nanocellulose-based materials, just like it is harmful for traditional cellulosic materials such as paper or cardboard. However, water is an integral component in plants, and many applications of nanocellulose already accept the presence of water or make use of it. This review gives a comprehensive account of nanocellulose-water interactions and their repercussions in all key areas of contemporary research: fundamental physical chemistry, chemical modification of nanocellulose, materials applications, and analytical methods to map the water interactions and the effect of water on a nanocellulose matrix.
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Affiliation(s)
- Laleh Solhi
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Valentina Guccini
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Katja Heise
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Iina Solala
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Elina Niinivaara
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland.,Department of Wood Science, University of British Columbia, Vancouver, British ColumbiaV6T 1Z4, Canada
| | - Wenyang Xu
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland.,Laboratory of Natural Materials Technology, Åbo Akademi University, TurkuFI-20500, Finland
| | - Karl Mihhels
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Marcel Kröger
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Zhuojun Meng
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland.,Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou325001, China
| | - Jakob Wohlert
- Wallenberg Wood Science Centre (WWSC), Department of Fibre and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044Stockholm, Sweden
| | - Han Tao
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
| | - Emily D Cranston
- Department of Wood Science, University of British Columbia, Vancouver, British ColumbiaV6T 1Z4, Canada.,Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British ColumbiaV6T 1Z3, Canada
| | - Eero Kontturi
- Department of Bioproducts and Biosystems, Aalto University, EspooFI-00076, Finland
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8
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Leister N, Götz V, Jan Bachmann S, Nachtigall S, Hosseinpour S, Peukert W, Karbstein H. A comprehensive methodology to study double emulsion stability. J Colloid Interface Sci 2023; 630:534-548. [DOI: 10.1016/j.jcis.2022.10.119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 10/15/2022] [Accepted: 10/22/2022] [Indexed: 11/05/2022]
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9
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Kondoh M, Sano A, Kawamura I, Ishibashi TA. Total Internal Reflection Raman Spectra of Alamethicin Interacting with Supported Lipid Bilayers at a Silica/Water Interface. J Phys Chem B 2022; 126:10712-10720. [PMID: 36440848 DOI: 10.1021/acs.jpcb.2c06371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report total internal reflection (TIR)-Raman spectroscopy to study intermolecular interactions between membrane-binding peptides and lipid bilayer membranes. The method was applied to alamethicin (ALM), a model peptide for channel proteins, interacting with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) bilayer membranes at a silica/water interface. After a dimethyl sulfoxide (DMSO) solution of ALM was added into the water subphase of the DPPC/DPPC bilayer, Raman signals in the CH stretching region increased in intensity reflecting the appearance of the Raman bands due to ALM and DMSO. To identify ALM-dependent spectral changes, we removed DPPC and DMSO contributions from the Raman spectra. We first subtracted the spectrum of the DPPC bilayer from those after the addition of the ALM solution. The contribution of DMSO was then removed by subtracting a DMSO spectrum from the resultant spectra. The DMSO spectrum was obtained in a similar way from a control experiment where DMSO alone was added into the subphase. With the use of this double difference approach, the ALM-dependent changes were successfully obtained. Experiments with DPPC bilayers with deuterated acyl chains revealed that most of the spectral change observed after the addition of ALM was due to the vibrational bands of ALM, not originated from ALM-induced conformational changes of the lipid bilayers.
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Affiliation(s)
- Masato Kondoh
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan
| | - Arisa Sano
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan
| | - Izuru Kawamura
- Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Taka-Aki Ishibashi
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan
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10
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Wu Y, Sun Y, Zhang C, He M, Qi D. Interfacial-assembly engineering of asymmetric magnetic-mesoporous organosilica nanocomposites with tunable architectures. NANOSCALE 2022; 14:15772-15788. [PMID: 36250227 DOI: 10.1039/d2nr03814e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The asymmetric morphology of nanomaterials plays a crucial role in regulating their physical and chemical properties, which can be tuned by two key factors: (i) interfacial interaction between seed particles and growth materials (anisotropic island nucleation) and (ii) reaction kinetics of the growth material (growth approach). However, controllable preparation of asymmetric nanoarchitectures is a daunting challenge because it is difficult to tune the interfacial energy profile of a nanoparticle. Here, we report an interfacial-assembly strategy that makes use of different surfactant/organosilica-oligomer micelles to actively regulate interfacial energy profiles, thus enabling controllable preparation of well-defined asymmetric nanoarchitectures (i.e., organosilica nano-tails) on magnetic Fe3O4 nanoparticles. For our magnetic nanocomposite system, the assembly structure of surfactant/organosilica-oligomer micelles and the interfacial electrostatic interaction are found to play critical roles in controlling the nucleation and architectures of asymmetric magnetic-mesoporous organosilica nanocomposite particles (AMMO-NCPs). Surfactant/organosilica-oligomer micelles with a one-dimensional wormlike linear structure could strengthen the interfacial assembly behavior between seed particles and growth materials, and thus achieved the longest tail length (25 μm) exceeding the previously reported highest recorded value (2.5 μm) of one order of magnitude. In addition, clickable AMMO-NCPs can employ a thiol-ene click reaction to modify their surface with a broad range of functional groups, such as amines, carboxyls, and even long alkyl chains, which allows for expanding functionalities. We demonstrate that C18 alkyl-grafted AMMO-NCPs can self-assemble into self-standing membranes with robust superhydrophobicity. In addition, carboxyl-modified AMMO-NCPs exhibit excellent adsorption capacity for cationic compounds. This study paves the way for designing and synthesizing asymmetric nanomaterials, which possess immense potential for future engineering applications in nanomaterial assembly, nanoreactors, biosensing, drug delivery, and beyond.
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Affiliation(s)
- Yue Wu
- Zhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing & Finishing, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China.
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Yangyi Sun
- Zhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing & Finishing, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China.
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Chengyu Zhang
- Zhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing & Finishing, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China.
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Mengyao He
- Zhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing & Finishing, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China.
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Dongming Qi
- Zhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing & Finishing, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China.
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
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11
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Scavini M, Bertolotti F, Mlloja J, Umbri F, Bosc A, Cappelli S, Checchia S, Oliva C, Fumagalli P, Ceresoli D, Longhi M, Guagliardi A, Coduri M. Structure and Surface Relaxation of CeO 2 Nanoparticles Unveiled by Combining Real and Reciprocal Space Total Scattering Analysis. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3385. [PMID: 36234513 PMCID: PMC9565251 DOI: 10.3390/nano12193385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/24/2022] [Accepted: 09/25/2022] [Indexed: 06/16/2023]
Abstract
We present a combined real and reciprocal space structural and microstructural characterization of CeO2 nanoparticles (NPs) exhibiting different crystallite sizes; ~3 nm CeO2 NPs were produced by an inverse micellae wet synthetic path and then annealed at different temperatures. X-ray total scattering data were analyzed by combining real-space-based Pair Distribution Function analysis and the reciprocal-space-based Debye Scattering Equation method with atomistic models. Subtle atomic-scale relaxations occur at the nanocrystal surface. The structural analysis was corroborated by ab initio DFT and force field calculations; micro-Raman and electron spin resonance added important insights to the NPs' defective structure. The combination of the above techniques suggests a core-shell like structure of ultrasmall NPs. These exhibit an expanded outer shell having a defective fluorite structure, while the inner shell is similar to the bulk structure. The presence of partially reduced O2-δ species testifies to the high surface activity of the NPs. On increasing the annealing temperature, the particle dimensions increase, limiting disorder as a consequence of the progressive surface-to-volume ratio reduction.
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Affiliation(s)
- Marco Scavini
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | - Federica Bertolotti
- Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università Degli Studi dell’Insubria, 22100 Como, Italy
| | - Jonadri Mlloja
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | - Filippo Umbri
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | - Anna Bosc
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | - Serena Cappelli
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | - Stefano Checchia
- ESRF, The European Synchrotron, 71, Avenue des Martyrs, CS40220, CEDEX 9, 38043 Grenoble, France
| | - Cesare Oliva
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | - Patrizia Fumagalli
- Dipartimento di Scienze Della Terra “Ardito Desio”, University of Milan, Via Botticelli 23, 20133 Milano, Italy
| | | | - Mariangela Longhi
- Department of Chemistry, University of Milan, Via Golgi 19, 20131 Milano, Italy
| | | | - Mauro Coduri
- Department of Chemistry, University of Pavia, V.le Taramelli, 12, 27100 Pavia, Italy
- INSTM, Via Giusti 9, 50121 Florence, Italy
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12
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Adsorption Characteristics of Ionic Surfactants on Anthracite Surface: A Combined Experimental and Modeling Study. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27165314. [PMID: 36014549 PMCID: PMC9416174 DOI: 10.3390/molecules27165314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 08/06/2022] [Accepted: 08/19/2022] [Indexed: 11/25/2022]
Abstract
Ionic surfactants are widely used in coal dust control in mines, and their adsorption characteristics on the coal surface have a great influence on the coal dust control effect. In this investigation, anionic sodium dodecylbenzenesulfonate (SDBS) and cationic octadecyltrimethylammonium chloride (STAC) were selected to explore the adsorption characteristics of ionic surfactants on the surface of anthracite. The experimental results show that the adsorption rate and efficiency of STAC on the surface of anthracite are higher than that of SDBS; STAC can form a denser surfactant layer on the surface of anthracite, with a larger adsorption capacity and higher strength. Molecular dynamics simulations show that the adsorption between STAC and the surface of anthracite is tighter, and the distribution at the coal–water interface is more uniform; the surface of anthracite modified by STAC has a stronger binding ability to water molecules.
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Dinh TD, Phan MN, Nguyen DT, Le TMD, Nadda AK, Srivastav AL, Pham TNM, Pham TD. Removal of beta-lactam antibiotic in water environment by adsorption technique using cationic surfactant functionalized nanosilica rice husk. ENVIRONMENTAL RESEARCH 2022; 210:112943. [PMID: 35176314 DOI: 10.1016/j.envres.2022.112943] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 01/27/2022] [Accepted: 02/09/2022] [Indexed: 06/14/2023]
Abstract
This study aims to investigate the adsorption characteristics of cationic surfactant, cetyltrimethylamonium bromide (CTAB) onto negatively nanosilica rice husk surface and the application for antibiotic treatment in water environment. Adsorption of CTAB onto nanosilica increased with an increase of solution pH, due to an enhancement of the electrostatic attraction between cationic methylamomethylamonium groups and negatively charged nanosilica surface enhanced at higher pH. Adsorption of CTAB decreased with a decrease of ionic strength while a common intersection point (CIP) was observed for adsorption isotherm at different ionic strengths, suggesting that hydrophobic interactions between alkyl chains in CTAB molecules significantly induced adsorption and admicelles with bilayer formation were dominant than monolayer of hemimicelles. The CTAB functionalized nanosilica (CFNS) was applied for removal of beta-lactam amoxicillin (AMX). The best conditions for AMX treatment using CFNS were selected as pH 10, contact time 60 min and CFNS dosage 10 mg/mL. Removal efficiency of AMX using CFNS reached to 100% under optimum conditions while it was only 25.01% using nanosilica without CTAB. The maximum AMX adsorption capacity using CFNS of about 25 mg/g was much higher than other adsorbents. The effects of different organics such as humic acid, anionic surfactant, and other antibiotics on AMX removal using CFNS were also studied. A two-step model can fit CTAB uptake isotherms onto nanosilica and AMX onto CFNS well at different KCl concentrations. Based on the desorption of CTAB with AMX adsorption as well as adsorption isotherms, the change in surface charge and functional vibration groups after adsorption, we indicate that AMX adsorption onto CFNS was mainly controlled by electrostatic interaction. We reveal that CFNS is an excellent adsorbent for antibiotic treatment from aqueous solution.
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Affiliation(s)
- Thi Diu Dinh
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam; Faculty of Environmental Sciences, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam
| | - Minh Nguyet Phan
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam
| | - Duc Thang Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam
| | - Thi Mai Dung Le
- Faculty of Environmental Sciences, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam
| | - Ashok Kumar Nadda
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat, Solan, Himachal Pradesh - 173 234, India
| | - Arun Lal Srivastav
- School of Engineering and Technology, Chitkara University, Himachal Pradesh-174103, India
| | - Thi Ngoc Mai Pham
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam.
| | - Tien Duc Pham
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Viet Nam; Office of Academic Affairs, University of Science, Vietnam National University, Hanoi - 334 Nguyen Trai, Thanh Xuan, Hanoi 100000, Viet Nam.
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Abdelmonem A, Zhang Y, Braunschweig B, Glikman D, Rumpel A, Peukert W, Begović T, Liu X, Lützenkirchen J. Adsorption of CTAB on Sapphire- c at High pH: Surface and Zeta Potential Measurements Combined with Sum-Frequency and Second-Harmonic Generation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:3380-3391. [PMID: 35271289 DOI: 10.1021/acs.langmuir.1c03069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The adsorption of cetyltrimethylammonium bromide (CTA+Br-) on sapphire-c surfaces was studied at pH 10 below the surfactants' critical micelle concentration. The evolution of interfacial potentials as a function of CTAB concentration was characterized by surface and zeta potential measurements and complemented by molecular dynamic (MD) simulations as well as by second-harmonic (SHG) and vibrational sum-frequency generation (SFG) spectroscopy. The changes in interfacial potentials suggest that the negative interfacial charge due to deprotonated surface aluminols groups is neutralized and can be even overcompensated by the presence of CTA+ cations at the interface. However, SFG intensities from strongly hydrogen-bonded interfacial water molecules as well as SHG intensities decrease with both increasing CTAB concentration and the magnitude of the surface potential. They do not suggest a charge reversal at the interface, while the change in zeta potential is actually consistent with an apparent charge inversion. This can be qualitatively explained by results from MD simulation, which reveal adsorbed CTA+ cations outside a first strongly bound hydration layer of water molecules, where they can locally distort the structural order and replace some of the interfacial water molecules adjacent to the first layer. This is proposed to be the origin for the significant loss in SFG and SHG intensities with increasing CTAB concentration. Moreover, we propose that CTA+ can act as a counterion and enhance the occurrence of deprotonated surface aluminols that is consistent with the decrease in surface potential.
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Affiliation(s)
- Ahmed Abdelmonem
- Institute of Meteorology and Climate Research - Atmospheric Aerosol Research (IMKAAF), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Yingchun Zhang
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Björn Braunschweig
- Institute of Physical Chemistry, Westfälische Wilhelms University Münster, Corrensstraße 28-30, 48149 Münster, Germany
| | - Dana Glikman
- Institute of Physical Chemistry, Westfälische Wilhelms University Münster, Corrensstraße 28-30, 48149 Münster, Germany
| | - Armin Rumpel
- Institute of Particle Technology (LFG), Friedrich Alexander University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Wolfgang Peukert
- Institute of Particle Technology (LFG), Friedrich Alexander University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Tajana Begović
- Department of Chemistry, University of Zagreb, Faculty of Science, Horvatovac 102a, 10 000 Zagreb, Croatia
| | - Xiandong Liu
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Johannes Lützenkirchen
- Institute of Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
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15
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Biosynthesis of Rutin Trihydrate Loaded Silica Nanoparticles and Investigation of Its Antioxidant, Antidiabetic and Cytotoxic Potentials. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02269-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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16
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Comparative effects of zinc oxide nanoparticles over the interfacial properties of low concentrations of ionic surfactants at interfaces. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128241] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Sthoer A, Adams EM, Sengupta S, Corkery RW, Allen HC, Tyrode EC. La 3+ and Y 3+ interactions with the carboxylic acid moiety at the liquid/vapor interface: Identification of binding complexes, charge reversal, and detection limits. J Colloid Interface Sci 2022; 608:2169-2180. [PMID: 34798383 DOI: 10.1016/j.jcis.2021.10.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/30/2021] [Accepted: 10/11/2021] [Indexed: 10/20/2022]
Abstract
Specific interactions of yttrium and lanthanum ions with a fatty acid Langmuir monolayer were investigated using vibrational sum frequency spectroscopy. The trivalent ions were shown to interact with the charged form of the carboxylic acid group from nanomolar concentrations (<300 nM). Analysis of the spectral features from both the symmetric and the asymmetric carboxylate modes reveals the presence of at least three distinct coordination structures linked to specific binding configurations. Although the same species were identified for both La3+ and Y3+, they display a different concentration dependence, highlighting the ion-specificity of the interaction. From the analysis of the response of interfacial water molecules, the reversal of the surface charge, as well as the formation of yttrium hydroxide complexes, were detected upon increasing the amount of salt in solution. The binding interaction and kinetics of absorption are sensitive to the solution pH, showing a distinct ion speciation in the interfacial region when compared to the bulk. Changing the subphase pH or adding a monovalent background electrolyte that promotes deprotonation of the carboxylic acid headgroup could further improve the detection limit of La3+ and Y3+ to concentrations < 100 nM. These findings demonstrate that nM concentrations of trace metals contaminants, typically found on monovalent salts, can significantly influence the binding structure and kinetics in Langmuir monolayers.
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Affiliation(s)
- Adrien Sthoer
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Ellen M Adams
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, OH 43210, USA; Department of Physical Chemistry II, Ruhr-Universität Bochum, 44801 Bochum, Germany(1)
| | - Sanghamitra Sengupta
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden; Ultrafast Spectroscopy, AMOLF, 1098 XG Science Park, Amsterdam, The Netherlands(1)
| | - Robert W Corkery
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden; Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, ACT0200, Australia
| | - Heather C Allen
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Eric C Tyrode
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
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18
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Nemoto F, Yamada NL, Hino M, Aoki H, Seto H. Neutron reflectometry-based in situ structural analysis of an aligning agent additive for the alignment of nematic liquid crystals on solid substrates. SOFT MATTER 2022; 18:545-553. [PMID: 34927662 DOI: 10.1039/d1sm01355f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Surface aligning agents, such as amphiphilic surfactants, are widely used to control the initial alignment of nematic liquid crystals (NLCs) in liquid crystal displays (LCDs). Generally, these agents are first coated on a substrate prior to NLC introduction. When mixed with NLCs, long alkyl chain amphiphilic agent additives may control the NLC alignment without requiring pretreatment because they may spontaneously form an adsorbed layer at the solid-NLC interface. These self-assembled layers (SALs) appear promising in the effective control of the initial alignment of LCDs. However, direct observation of the adsorbed layer structure in contact with the NLCs is challenging due to probe limitations. Furthermore, the areal densities and alignments of the amphiphiles adsorbed from NLCs at the solid-NLC interface are not previously reported. Herein, the structure of the surface aligning agent n-hexadecyltrimethylammonium-d42 bromide (d-CTAB) was investigated at the silicon-NLC interface using in situ neutron reflectometry (NR), which indicated that the CTAB self-assembled as a monolayer, with its alignment dependent on the amphiphile concentration. At low amphiphile concentrations, the alignment of the SAL and NLCs was parallel to the substrate. With increasing amphiphile concentration, the number of amphiphiles attached to the substrate increased within the framework of the Gibbs monolayer, with the alignment of the amphiphiles and NLCs becoming perpendicular to the substrate. The experimental setup used here is comparable to those of more natural systems, such as those found in the alignment of NLCs in LCDs.
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Affiliation(s)
- Fumiya Nemoto
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan.
- Materials and Life Science Division, Japan Proton Accelerator Research Complex, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
- Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
| | - Norifumi L Yamada
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan.
- Materials and Life Science Division, Japan Proton Accelerator Research Complex, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
| | - Masahiro Hino
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-1010 Asashiro-Nishi, Kumatori, Sennan, Osaka 590-0494, Japan
| | - Hiroyuki Aoki
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan.
- Materials and Life Science Division, Japan Proton Accelerator Research Complex, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
- Neutron Science Section, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
| | - Hideki Seto
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan.
- Materials and Life Science Division, Japan Proton Accelerator Research Complex, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
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19
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Ly T, Baldelli S. Cooperative Adsorption of Nonionic Triton X-100 and Dodecyldimethylamine Oxide Surfactant Mixtures at the Hydrophilic Silica-Water Interface Studied by Total Internal Reflection Raman Spectroscopy and Multivariate Curve Resolution. J Phys Chem B 2021; 125:13928-13936. [PMID: 34914395 DOI: 10.1021/acs.jpcb.1c08148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The adsorption of dimethyldodecylamine oxide (DDAO) and Triton X-100 (TX) as single components and mixed systems at the silica-water interface has been studied using total internal reflection (TIR) Raman spectroscopy combined with multivariate curve resolution (MCR). In this study, the mixtures of DDAO and TX indicate minimal synergism in the bulk solution; however, the cooperative adsorption behavior on the silica surface is shown with various mixtures of DDAO (up to 1.3 mM) and TX (up to 1.1 mM). Adding the DDAO (up to 0.3 mM) to TX solution, the surface excess of TX shows 30% enhancement, from 1.2 to 1.8 μmol m-2. Adding the DDAO also shifts the TX adsorption isotherms, resulting in the Gibbs free energy change of -2.87 ± 0.73 kJ mol-1. This free energy change is interpreted as the decrease in surface energy when the silica surface charged sites are screened by the DDAO adsorbed layer. Alternatively, when a DDAO solution contains a small amount of TX molecules, i.e., < 30 μM, its adsorption on the silica surface quickly equilibrates. In addition, the formation of a more ordered liquid-crystalline adsorbed layer, as in the case of single-component DDAO adsorption, is not observed.
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Affiliation(s)
- Thong Ly
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Steven Baldelli
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
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20
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Antibacterial toxicity of mesoporous silica nanoparticles with functional decoration of specific organic moieties. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127612] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Hosseinpour S, Götz V, Peukert W. Einfluss von Tensiden auf die molekulare Struktur der Öl/Wasser‐Grenzfläche. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Saman Hosseinpour
- Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik (LFG) Interdisziplinäres Zentrum für Funktionale Partikelsysteme (FPS) Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Cauerstraße 4 91058 Erlangen Deutschland
| | - Vanessa Götz
- Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik (LFG) Interdisziplinäres Zentrum für Funktionale Partikelsysteme (FPS) Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Cauerstraße 4 91058 Erlangen Deutschland
| | - Wolfgang Peukert
- Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik (LFG) Interdisziplinäres Zentrum für Funktionale Partikelsysteme (FPS) Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Cauerstraße 4 91058 Erlangen Deutschland
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22
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Hosseinpour S, Götz V, Peukert W. Effect of Surfactants on the Molecular Structure of the Buried Oil/Water Interface. Angew Chem Int Ed Engl 2021; 60:25143-25150. [PMID: 34478223 PMCID: PMC9293143 DOI: 10.1002/anie.202110091] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Indexed: 12/30/2022]
Abstract
The oil/water interface, for instance in emulsions, is often stabilized by surfactants. Hence, the co-existence of oil, water, and surfactant molecules at the buried oil/water interface determines macroscopic properties such as surface tension or emulsion stability. Utilizing an inherently surface sensitive spectroscopic method, sum frequency generation (SFG) spectroscopy, we show that adsorption of an anionic surfactant to the buried oil/water interface increases the magnitude of the interfacial electric field. Meanwhile, the degree of ordering of the interfacial oil molecules increases with the surfactant concentration owing to the intercalation of aliphatic chains of interfacial oil and surfactant molecules. At sufficiently high surfactant concentrations, the interfacial charge reaches a maximum value and the interfacial oil molecules arrange in a fully ordered conformation, a state which coincides with the significant decrease in interfacial tension and increased emulsion stability.
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Affiliation(s)
- Saman Hosseinpour
- Institute of Particle Technology (LFG), Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstrasse 4, 91058, Erlangen, Germany
| | - Vanessa Götz
- Institute of Particle Technology (LFG), Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstrasse 4, 91058, Erlangen, Germany
| | - Wolfgang Peukert
- Institute of Particle Technology (LFG), Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstrasse 4, 91058, Erlangen, Germany
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23
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Ly TQ, Yang F, Baldelli S. In situ quantitative study of the phase transition in surfactant adsorption layers at the silica-water interface using total internal reflection Raman spectroscopy. Phys Chem Chem Phys 2021; 23:21701-21713. [PMID: 34581333 DOI: 10.1039/d1cp02645c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Dimethyldodecylamine N-oxide (DDAO), a unique type of surfactant, shows high surface activity with two distinct energy states at the buried hydrophilic silica/aqueous solution interface studied by total internal reflection (TIR) Raman spectroscopy combined with ratiometric and kinetic analysis. Different from other types of surfactant, i.e., ionic and nonionic, the adsorption of DDAO demonstrates a specific critical surface aggregation concentration (csac) at 0.15 mM gives a complete surface coverage of 6.6 ± 0.3 μmol m-2, much lower than the bulk critical micellization concentration (cmc) at the same conditions (csac ≈ 0.072 cmc). A phase transition of adsorbed layers from liquid crystalline as the intermediate state to the disordered liquid phase is spectroscopically and energetically analyzed. The adsorption of DDAO on silica surfaces is described quantitatively in a potential energy curve.
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Affiliation(s)
- Thong Q Ly
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| | - Fangyuan Yang
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| | - Steven Baldelli
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
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24
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Yekeen N, Xin Kun T, Al-Yaseri A, Sagala F, Kamal Idris A. Influence of critical parameters on nanoparticles-surfactant stabilized CO2 foam stability at sub-critical and supercritical conditions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116658] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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25
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Liu Z, Zhao G, Brewer M, Lv Q, Sudhölter EJR. Comprehensive review on surfactant adsorption on mineral surfaces in chemical enhanced oil recovery. Adv Colloid Interface Sci 2021; 294:102467. [PMID: 34175528 DOI: 10.1016/j.cis.2021.102467] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/23/2021] [Accepted: 06/13/2021] [Indexed: 01/20/2023]
Abstract
With the increasing demand for efficient extraction of residual oil, enhanced oil recovery (EOR) offers prospects for producing more reservoirs' original oil in place. As one of the most promising methods, chemical EOR (cEOR) is the process of injecting chemicals (polymers, alkalis, and surfactants) into reservoirs. However, the main issue that influences the recovery efficiency in surfactant flooding of cEOR is surfactant losses through adsorption to the reservoir rocks. This review focuses on the key issue of surfactant adsorption in cEOR and addresses major concerns regarding surfactant adsorption processes. We first describe the adsorption behavior of surfactants with particular emphasis on adsorption mechanisms, isotherms, kinetics, thermodynamics, and adsorption structures. Factors that affect surfactant adsorption such as surfactant characteristics, solution chemistry, rock mineralogy, and temperature were discussed systematically. To minimize surfactant adsorption, the chemical additives of alkalis, polymers, nanoparticles, co-solvents, and ionic liquids are highlighted as well as implementing with salinity gradient and low salinity water flooding strategies. Finally, current trends and future challenges related to the harsh conditions in surfactant based EOR are outlined. It is expected to provide solid knowledge to understand surfactant adsorption involved in cEOR and contribute to improved flooding strategies with reduced surfactant loss.
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Affiliation(s)
- Zilong Liu
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, College of Science, Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, PR China; Organic Materials & Interfaces, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
| | - Ge Zhao
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, College of Science, Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, PR China
| | - Mark Brewer
- Shell Global Solutions International B.V., Shell Technology Centre Amsterdam (STCA), Grasweg 31, 1031 HW Amsterdam, The Netherlands
| | - Qichao Lv
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, College of Science, Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, PR China.
| | - Ernst J R Sudhölter
- Organic Materials & Interfaces, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
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26
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Shool L, Butenko AV, Liber SR, Rabin Y, Sloutskin E. Anomalous Temperature-Controlled Concave-Convex Switching of Curved Oil-Water Menisci. J Phys Chem Lett 2021; 12:6834-6839. [PMID: 34279944 DOI: 10.1021/acs.jpclett.1c01937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
While the curvature of the classical liquid surfaces exhibits only a weak temperature dependence, we demonstrate here a reversible temperature-tunable concave-convex shape switching in capillary-contained, surfactant-decorated, oil-water interfaces. The observed switching gives rise to a concave-convex shape transition, which takes place as a function of the width of the containing capillary. This apparent violation of Young's equation results from a hitherto-unreported sharp reversible hydrophobic-hydrophilic transition of the glass capillary walls. The transition is driven by the interfacial freezing effect, which controls the balance between the competing surfactants' adsorption on, and consequent hydrophobization of, the capillary walls and their incorporation into the interfacially frozen monolayer. Since capillary wetting by surfactant solutions is fundamental for a wide range of technologies and natural phenomena, the present observations have important implications in many fields, from fluid engineering to biology, and beyond.
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Affiliation(s)
- Lee Shool
- Physics Department & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Alexander V Butenko
- Physics Department & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Shir R Liber
- Physics Department & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Yitzhak Rabin
- Physics Department & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Eli Sloutskin
- Physics Department & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
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27
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Park H, Lee SH. Review on Interfacial Bonding Mechanism of Functional Polymer Coating on Glass in Atomistic Modeling Perspective. Polymers (Basel) 2021; 13:polym13142244. [PMID: 34301000 PMCID: PMC8309365 DOI: 10.3390/polym13142244] [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: 06/14/2021] [Revised: 07/03/2021] [Accepted: 07/05/2021] [Indexed: 01/03/2023] Open
Abstract
Atomistic modeling methods are successfully applied to understand interfacial interaction in nanoscale size and analyze adhesion mechanism in the organic-inorganic interface. In this paper, we review recent representative atomistic simulation works, focusing on the interfacial bonding, adhesion strength, and failure behavior between polymer film and silicate glass. The simulation works are described under two categories, namely non-bonded and bonded interaction. In the works for non-bonded interaction, three main interactions, namely van der Waals interaction, polar interaction, and hydrogen bonds, are investigated, and the contributions to interfacial adhesion energy are analyzed. It is revealed that the most dominant interaction for adhesion is hydrogen bonding, but flexibility of the polymer film and modes of adhesion measurement test do affect adhesion and failure behavior. In the case of bonded interactions, the mechanism of covalent silane bond formation through condensation and hydrolysis process is reviewed, and surface reactivity, molecular density, and adhesion properties are calculated with an example of silane functionalized polymer. Besides interfacial interactions, effects of external conditions, such as surface morphology of the glass substrate and relative humidity on the adhesion and failure behavior, are presented, and modeling techniques developed for building interfacial system and calculating adhesion strengths are briefly introduced.
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Zhang Q, Tamayo A, Leonardi F, Mas-Torrent M. Interplay between Electrolyte-Gated Organic Field-Effect Transistors and Surfactants: A Surface Aggregation Tool and Protecting Semiconducting Layer. ACS APPLIED MATERIALS & INTERFACES 2021; 13:30902-30909. [PMID: 34156234 PMCID: PMC8289230 DOI: 10.1021/acsami.1c05938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 06/08/2021] [Indexed: 06/13/2023]
Abstract
Molecular surfactants, which are based on a water-insoluble tail and a water-soluble head, are widely employed in many areas, such as surface coatings or for drug delivery, thanks to their capability to form micelles in solution or supramolecular structures at the solid/liquid interface. Electrolyte-gated organic field-effect transistors (EGOFETs) are highly sensitive to changes occurring at their electrolyte/gate electrode and electrolyte/organic semiconductor interfaces, and hence, they have been much explored in biosensing due to their inherent amplification properties. Here, we demonstrate that the EGOFETs and surfactants can provide mutual benefits to each other. EGOFETs can be a simple and complementary tool to study the aggregation behavior of cationic and anionic surfactants at low concentrations on a polarized metal surface. In this way, we have monitored the monolayer formation of cationic and anionic surfactants at the water/electrode interface with p-type and n-type devices, respectively. On the other hand, the operational stability of EGOFETs has been dramatically enhanced, thanks to the formation of a protective layer on top of the organic semiconductor by exposing it to a high concentration of a surfactant solution (above the critical micelle concentration). Stable performances were achieved for more than 10 and 2 h of continuous operation for p-type and n-type devices, respectively. Accordingly, this work points not only that EGOFETs can be applied to a wider range of applications beyond biosensing but also that these devices can effectively improve their long-term stability by simply treating them with a suitable surfactant.
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Affiliation(s)
- Qiaoming Zhang
- School
of Physical Science and Technology, Southwest
University, 400715 Chongqing, P. R. China
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Bellaterra, 08193 Barcelona, Spain
| | - Adrián Tamayo
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Bellaterra, 08193 Barcelona, Spain
| | - Francesca Leonardi
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Bellaterra, 08193 Barcelona, Spain
| | - Marta Mas-Torrent
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Bellaterra, 08193 Barcelona, Spain
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Bera B, Backus EHG, Carrier O, Bonn M, Shahidzadeh N, Bonn D. Antisurfactant (Autophobic) Behavior of Superspreader Surfactant Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6243-6247. [PMID: 33983746 PMCID: PMC8280720 DOI: 10.1021/acs.langmuir.1c00475] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Surfactants are often added to water to increase the wetting of hydrophobic surfaces. We previously showed that most surfactant solutions behave identically to simple liquids with the same surface tension, indicating that the surfactants do not change the wettability of the solid surface itself. Here, we show that the superspreading surfactant Silwet results in a systematically higher contact angle on a hydrophobic surface than other surfactant solutions of comparable liquid-vapor surface tension. We also experimentally observe this "antisurfactant" behavior for CTAB on hydrophilic substrates. Supported by sum-frequency generation spectroscopy results, we suggest that this effect is due to charge-binding of the surfactant with the substrate.
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Affiliation(s)
- Bijoy Bera
- Institute
of Physics, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Ellen H. G. Backus
- Institut
für Physikalische Chemie, Währinger Straße 42, 1090 Wien, Austria
- Max
Planck Institute for Polymer Research, Ackermannweg 10, D-35128 Mainz, Germany
| | - Odile Carrier
- Institute
of Physics, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, D-35128 Mainz, Germany
| | | | - Daniel Bonn
- Institute
of Physics, Science Park 904, 1098XH Amsterdam, The Netherlands
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Wu H, Li Z, Wang Y, Zhu W. Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process. J Phys Chem B 2021; 125:4874-4882. [PMID: 33929854 DOI: 10.1021/acs.jpcb.0c09901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cetyltrimethyl ammonium bromide (CTAB) is used to decorate the SiC particle surface. The mechanism of the decoration process has been studied by simulation and experimental approaches. Molecular dynamics (MD) simulation finds a bilayer adsorbed structure of CTAB on the SiC particles, which is then verified by Fourier-transform infrared and thermal gravimetric analysis measurements. The MD simulation also finds that the decorative effects of CTAB on the SiC particle surface are related to the surface charge condition of the SiC particles and the concentration of CTAB. The measured zeta potential of the SiC particles shows dependence on the pH condition and the concentration of CTAB. The decorated SiC particles are used to produce composition by the co-deposition technology. With the help of CTAB, SiC particles are successfully incorporated in the deposited layer, where the content of SiC particles is dependent on the concentration of CTAB and the pH of the bath.
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Affiliation(s)
- Houya Wu
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.,State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Zhiyi Li
- State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Yan Wang
- State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Wenhui Zhu
- State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
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Bazazi P, Hejazi SH. Cellulose Nanocrystal Laden Oil–Water Interfaces: Interfacial Viscoelasticity, Emulsion Stability, and the Dynamics of Three-Phase Contact-Lines. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00413] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Parisa Bazazi
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - S. Hossein Hejazi
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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Ma K, Li PX, Thomas RK, Penfold J. Unusual Maximum in the Adsorption of Aqueous Surfactant Mixtures: Neutron Reflectometry of Mixtures of Zwitterionic and Ionic Surfactants at the Silica-Aqueous Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3939-3949. [PMID: 33775091 DOI: 10.1021/acs.langmuir.1c00178] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The adsorption of two zwitterionic surfactants, dodecyldimethylammonium propanesulfonate (C12PS) and dodecyldimethylammonium carboxybetaine (C12CB), and of their mixtures with the cationic dodecyltrimethylammonium bromide (C12TAB) and the anionic sodium dodecylsulfate (SDS) at the silica-water interface has been studied by neutron reflection (NR). The total adsorption, the composition of the adsorbed layer, and some structural information have been obtained over a range of concentrations from below the critical micelle concentration (CMC) to about 30× the mixed CMC. The adsorption behavior has been considered in relation to the previously measured micellar equilibrium of these mixtures in their bulk solutions and their adsorption at the air-water interface. C12CB adsorbs cooperatively close to its CMC to form an almost complete bilayer on its own, whereas C12PS adsorbs more weakly in a fragmented bilayer structure. Although SDS does not normally adsorb at the silica-water interface, SDS adsorbs strongly and cooperatively with C12PS at fractional SDS compositions up to about 0.5. This cooperativity is lost when the adsorbed fraction of SDS rises above about 0.5. At this point, adsorption drops sharply, creating an unusual maximum in the variation of adsorption with a total concentration above the mixed CMC. Neither the increase in cooperativity nor the subsequent decline in adsorption results directly from variations of the independently determined monomer concentrations in the bulk solution. The adsorption maximum is predominantly the effect of strong cooperative interaction, possibly accompanied by partial segregation of SDS within the layer, followed by charge repulsion from the surface. Although the solution aggregation and adsorption at the A-W interface are similar for SDS with C12CB, the addition of SDS to C12CB at the silica-water interface promotes the opposite behavior to that of SDS with C12PS, and SDS simply disrupts the cooperative binding of C12CB. Unlike SDS, the cationic surfactant C12TAB adsorbs on silica. It therefore coadsorbs at the SiO2-W interface with either C12CB or C12PS. However, in neither case is there any pronounced cooperativity and, even though the presence of C12TAB might be expected to favor adsorption, the adsorption is generally unexpectedly low.
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Affiliation(s)
- Kun Ma
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, U.K
| | - Pei Xun Li
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, U.K
| | - Robert K Thomas
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, U.K
| | - Jeffrey Penfold
- Rutherford-Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K
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Deng GH, Wei Q, Qian Y, Zhang T, Leng X, Rao Y. Development of interface-/surface-specific two-dimensional electronic spectroscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:023104. [PMID: 33648131 DOI: 10.1063/5.0019564] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 01/26/2021] [Indexed: 06/12/2023]
Abstract
Structures, kinetics, and chemical reactivities at interfaces and surfaces are key to understanding many of the fundamental scientific problems related to chemical, material, biological, and physical systems. These steady-state and dynamical properties at interfaces and surfaces require even-order techniques with time-resolution and spectral-resolution. Here, we develop fourth-order interface-/surface-specific two-dimensional electronic spectroscopy, including both two-dimensional electronic sum frequency generation (2D-ESFG) spectroscopy and two-dimensional electronic second harmonic generation (2D-ESHG) spectroscopy, for structural and dynamics studies of interfaces and surfaces. The 2D-ESFG and 2D-ESHG techniques were based on a unique laser source of broadband short-wave IR from 1200 nm to 2200 nm from a home-built optical parametric amplifier. With the broadband short-wave IR source, surface spectra cover most of the visible light region from 480 nm to 760 nm. A translating wedge-based identical pulses encoding system (TWINs) was introduced to generate a phase-locked pulse pair for coherent excitation in the 2D-ESFG and 2D-ESHG. As an example, we demonstrated surface dark states and their interactions of the surface states at p-type GaAs (001) surfaces with the 2D-ESFG and 2D-ESHG techniques. These newly developed time-resolved and interface-/surface-specific 2D spectroscopies would bring new information for structure and dynamics at interfaces and surfaces in the fields of the environment, materials, catalysis, and biology.
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Affiliation(s)
- Gang-Hua Deng
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA
| | - Qianshun Wei
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA
| | - Yuqin Qian
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA
| | - Tong Zhang
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA
| | - Xuan Leng
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA
| | - Yi Rao
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA
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Kowalczyk D, Kaminska I. Effect of pH and surfactants on the electrokinetic properties of nanoparticles dispersions and their application to the PET fibres modification. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Ngo D, He X, Luo H, Qu J, Kim SH. Competitive Adsorption of Lubricant Base Oil and Ionic Liquid Additives at Air/Liquid and Solid/Liquid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7582-7592. [PMID: 32482066 DOI: 10.1021/acs.langmuir.0c01197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Oil-soluble ionic liquids (ILs) have been proved as effective additives in lubricant oils through tribological experiments and post-test analytical analyses. In this study, surface structures of lubricant base oil, oil-soluble ILs, and their mixtures at the air/liquid and solid/liquid interfaces have been studied using sum frequency generation (SFG) vibrational spectroscopy. At the air/base oil and air/IL interfaces, the alkyl chains of the studied compounds were shown to be conformationally disordered and their terminal methyl groups point outward at the liquid surface. The base oil dominates the air/(base oil + IL) interface due to its higher surface excess propensity and larger bulk concentration. At the solid (silica) surface, ILs adopt a structure with their charged headgroups in contact with the silica surface, while their alkyl chains are more conformationally ordered or packed compared to the air/IL interface. At the interface between silica and (base oil + IL) mixtures, ILs also preferentially adsorb to the silica surface with their layer structures somewhat different from those of ILs alone. These results showed that ILs can adsorb onto the solid surface even before tribological contacts are made. The insights obtained from this SFG study provide a better understanding of the role of ionic liquids in lubrication.
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Affiliation(s)
- Dien Ngo
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Xin He
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Huimin Luo
- Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jun Qu
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
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36
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Carpenter AP, Altman RM, Tran E, Richmond GL. How Low Can You Go? Molecular Details of Low-Charge Nanoemulsion Surfaces. J Phys Chem B 2020; 124:4234-4245. [DOI: 10.1021/acs.jpcb.0c03293] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Andrew P. Carpenter
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97405, United States
| | - Rebecca M. Altman
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97405, United States
| | - Emma Tran
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97405, United States
| | - Geraldine L. Richmond
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97405, United States
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37
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Bergendal E, Campbell RA, Pilkington GA, Müller-Buschbaum P, Rutland MW. 3D texturing of the air-water interface by biomimetic self-assembly. NANOSCALE HORIZONS 2020; 5:839-846. [PMID: 32364200 DOI: 10.1039/c9nh00722a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A simple, insoluble monolayer of fatty acid is shown to induce 3D nanotexturing of the air-water interface. This advance has been achieved through the study of monolayers of a methyl-branched long chain fatty acid, analogous to those found on the surface of hair and wool, directly at the air-water interface. Specular neutron reflectometry combined with AFM probing of deposited monolayers shows pronounced 3D surface domains, which are absent for unbranched analogues and are attributed to hydrocarbon packing constraints. The resulting surface topographies of the water far exceed the height perturbation that can be explained by the presence of capillary waves of a free liquid surface. These have hitherto been considered the only source of perturbation of the flatness of a planar water interface under gravity in the absence of topographical features from the presence of extended, globular or particulate matter. This amounts to a paradigm shift in the study of interfacial films and opens the possibility of 3D texturing of the air-water interface.
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Affiliation(s)
- Erik Bergendal
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Drottning Kristinas väg 51, 10044 Stockholm, Sweden.
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Khan MR, Premadasa UI, Cimatu KLA. Role of the cationic headgroup to conformational changes undergone by shorter alkyl chain surfactant and water molecules at the air-liquid interface. J Colloid Interface Sci 2020; 568:221-233. [DOI: 10.1016/j.jcis.2020.02.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/13/2020] [Accepted: 02/14/2020] [Indexed: 01/03/2023]
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39
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Lu J, Liu Z, Wu Z, Liu W, Yang C. Synergistic effects of binary surfactant mixtures in the removal of Cr(VI) from its aqueous solution by foam fractionation. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116346] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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Kozon D, Mierzejewska J, Kobiela T, Grochowska A, Dudnyk K, Głogowska A, Sobiepanek A, Kuźmińska A, Ciach T, Augustynowicz‐Kopeć E, Jańczewski D. Amphiphilic Polymethyloxazoline–Polyethyleneimine Copolymers: Interaction with Lipid Bilayer and Antibacterial Properties. Macromol Biosci 2019; 19:e1900254. [DOI: 10.1002/mabi.201900254] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/30/2019] [Indexed: 01/18/2023]
Affiliation(s)
- Dominika Kozon
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
| | - Jolanta Mierzejewska
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
| | - Tomasz Kobiela
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
| | - Agnieszka Grochowska
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
- Department of MicrobiologyNational Tuberculosis and Lung Diseases Research Institute Płocka 26 01–138 Warsaw Poland
| | - Ksenia Dudnyk
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
| | - Agnieszka Głogowska
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
| | - Anna Sobiepanek
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
| | - Aleksandra Kuźmińska
- Faculty of Chemical and Process EngineeringWarsaw University of Technology Waryńskiego 1 00–645 Warsaw Poland
| | - Tomasz Ciach
- Faculty of Chemical and Process EngineeringWarsaw University of Technology Waryńskiego 1 00–645 Warsaw Poland
| | - Ewa Augustynowicz‐Kopeć
- Department of MicrobiologyNational Tuberculosis and Lung Diseases Research Institute Płocka 26 01–138 Warsaw Poland
| | - Dominik Jańczewski
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00–664 Warsaw Poland
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Pryazhnikov DV, Kubrakova IV, Grebneva-Balyuk ON, Maryutina TA. Magnetite-based highly dispersed materials for the sorption of asphaltenes. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.11.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Niu J, Liu H, Wang X, Wu D. Molecularly Imprinted Phase-Change Microcapsule System for Bifunctional Applications in Waste Heat Recovery and Targeted Pollutant Removal. ACS APPLIED MATERIALS & INTERFACES 2019; 11:37644-37664. [PMID: 31553156 DOI: 10.1021/acsami.9b11856] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An innovative design of a molecularly imprinted phase-change microcapsule (MIM) system for bifunctional applications in waste heat recovery and targeted pollutant removal was reported in this work. This molecularly imprinted system was successfully constructed by encapsulating n-eicosane with a SiO2 base shell through emulsion-templated interfacial polycondensation and then coating a molecularly imprinted polymeric layer with bisphenol A (BPA) as a template molecule through surface free-radical polymerization. The morphology, microstructure, and chemical structure of the resultant molecularly imprinted phase-change microcapsules (MIMs) were characterized, and their phase-change behavior, thermal energy-storage performance, and selective adsorption capability were investigated intensively. The MIMs developed in this study achieved an outstanding latent heat-storage capability with a high capacity more than 165 J/g and also showed an excellent phase-change reliability with a very small fluctuation in phase-change temperatures and enthalpies after 500 thermal cycles. Moreover, the MIMs also presented a high thermal stability over 200 °C and good shape stability up to 120 °C. Most of all, an effective specific recognition capability and high recognition efficiency were achieved for the MIMs due to the formation of BPA-molecular imprinting sites on their surface. As a result, the MIMs exhibited good adsorption selectivity toward the BPA molecules and satisfactory reusability for targeted removal of BPA with a removal efficiency of 61.7% after 10 cycles of the rebinding-elution procedure. In view of a smart combination of thermal energy-storage and selective adsorption functions, the MIMs developed in this study demonstrate a great potential in applications for waste heat recovery and targeted pollutant removal of industrial and domestic wastewaters.
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Affiliation(s)
- Jinfei Niu
- State Key Laboratory of Organic-Inorganic Composites , Beijing University of Chemical Technology , Beijing 100029 , China
| | - Huan Liu
- State Key Laboratory of Organic-Inorganic Composites , Beijing University of Chemical Technology , Beijing 100029 , China
| | - Xiaodong Wang
- State Key Laboratory of Organic-Inorganic Composites , Beijing University of Chemical Technology , Beijing 100029 , China
| | - Dezhen Wu
- State Key Laboratory of Organic-Inorganic Composites , Beijing University of Chemical Technology , Beijing 100029 , China
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Ciszewski RK, Gordon BP, Muller BN, Richmond GL. Takes Two to Tango: Choreography of the Coadsorption of CTAB and Hexanol at the Oil-Water Interface. J Phys Chem B 2019; 123:8519-8531. [PMID: 31513405 DOI: 10.1021/acs.jpcb.9b05775] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mixed surfactant systems at the oil-water interface play a vital role in applications ranging widely from drug delivery to oil-spill remediation. Synergistic mixtures are superior emulsifiers and more effective at modifying surface tension than either component alone. Mixtures of surfactants with dissimilar polar head groups are of particular interest because of the additional degree of control they offer. The interplay of hydrophobic and electrostatic effects in these systems is not well understood, in part because of the difficulty in examining their behavior at the buried oil-water interface where they reside. Here, surface-specific vibrational sum frequency spectroscopy is utilized in combination with surface tensiometry and computational methods to probe the cooperative molecular interactions between a cationic surfactant cetyltrimethylammonium bromide (CTAB) and a nonionic alcohol (1-hexanol) that induce the two initially reluctant surfactants to coadsorb synergistically at the interface. A careful deuteration study of CTAB reveals that hexanol cooperates with CTAB such that both molecules preferentially orient at the interface for sufficiently large enough concentrations of hexanol. This work's methodology is unique and serves as a guide for future explorations of macroscopic properties in these complex systems. Results from this work also provide valuable insights into how interfacial ordering impacts surface tensiometry measurements for nonionic surfactants.
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Affiliation(s)
- Regina K Ciszewski
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Brittany P Gordon
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Benjamin N Muller
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Geraldine L Richmond
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
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Azizi Q, Hashemabadi SH, Akbari S. Experimental and numerical study of the impact of viscosity ratio and velocity on the multiphase flow in micromodels. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1664909] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Qumars Azizi
- Computational Fluid Dynamics (CFD) Research Laboratory, School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Seyed Hassan Hashemabadi
- Computational Fluid Dynamics (CFD) Research Laboratory, School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Soheil Akbari
- Department of Chemical Engineering, Laval University, Quebec, QC, Canada
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Haryadi BM, Hafner D, Amin I, Schubel R, Jordan R, Winter G, Engert J. Nonspherical Nanoparticle Shape Stability Is Affected by Complex Manufacturing Aspects: Its Implications for Drug Delivery and Targeting. Adv Healthc Mater 2019; 8:e1900352. [PMID: 31410996 DOI: 10.1002/adhm.201900352] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 07/05/2019] [Indexed: 02/04/2023]
Abstract
The shape of nanoparticles is known recently as an important design parameter influencing considerably the fate of nanoparticles with and in biological systems. Several manufacturing techniques to generate nonspherical nanoparticles as well as studies on in vitro and in vivo effects thereof have been described. However, nonspherical nanoparticle shape stability in physiological-related conditions and the impact of formulation parameters on nonspherical nanoparticle resistance still need to be investigated. To address these issues, different nanoparticle fabrication methods using biodegradable polymers are explored to produce nonspherical nanoparticles via the prevailing film-stretching method. In addition, systematic comparisons to other nanoparticle systems prepared by different manufacturing techniques and less biodegradable materials (but still commonly utilized for drug delivery and targeting) are conducted. The study evinces that the strong interplay from multiple nanoparticle properties (i.e., internal structure, Young's modulus, surface roughness, liquefaction temperature [glass transition (Tg ) or melting (Tm )], porosity, and surface hydrophobicity) is present. It is not possible to predict the nonsphericity longevity by merely one or two factor(s). The most influential features in preserving the nonsphericity of nanoparticles are existence of internal structure and low surface hydrophobicity (i.e., surface-free energy (SFE) > ≈55 mN m-1 , material-water interfacial tension <6 mN m-1 ), especially if the nanoparticles are soft (<1 GPa), rough (Rrms > 10 nm), porous (>1 m2 g-1 ), and in possession of low bulk liquefaction temperature (<100 °C). Interestingly, low surface hydrophobicity of nanoparticles can be obtained indirectly by the significant presence of residual stabilizers. Therefore, it is strongly suggested that nonsphericity of particle systems is highly dependent on surface chemistry but cannot be appraised separately from other factors. These results and reviews allot valuable guidelines for the design and manufacturing of nonspherical nanoparticles having adequate shape stability, thereby appropriate with their usage purposes. Furthermore, they can assist in understanding and explaining the possible mechanisms of nonspherical nanoparticles effectivity loss and distinctive material behavior at the nanoscale.
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Affiliation(s)
- Bernard Manuel Haryadi
- Pharmaceutical Technology and BiopharmaceuticsDepartment of PharmacyLudwig‐Maximilians‐Universität München Butenandtstraße 5 81377 Munich Germany
| | - Daniel Hafner
- Department of ChemistryDresden University of Technology Mommsenstraße 4 01069 Dresden Germany
| | - Ihsan Amin
- Department of ChemistryDresden University of Technology Mommsenstraße 4 01069 Dresden Germany
| | - Rene Schubel
- Department of ChemistryDresden University of Technology Mommsenstraße 4 01069 Dresden Germany
| | - Rainer Jordan
- Department of ChemistryDresden University of Technology Mommsenstraße 4 01069 Dresden Germany
| | - Gerhard Winter
- Pharmaceutical Technology and BiopharmaceuticsDepartment of PharmacyLudwig‐Maximilians‐Universität München Butenandtstraße 5 81377 Munich Germany
| | - Julia Engert
- Pharmaceutical Technology and BiopharmaceuticsDepartment of PharmacyLudwig‐Maximilians‐Universität München Butenandtstraße 5 81377 Munich Germany
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Kékicheff P. The long-range attraction between hydrophobic macroscopic surfaces. Adv Colloid Interface Sci 2019; 270:191-215. [PMID: 31277036 DOI: 10.1016/j.cis.2019.06.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 10/26/2022]
Abstract
Direct measurements of the long-range strongly attractive force observed between macroscopic hydrophobic surfaces across aqueous solutions are reexamined in light of recent experiments and theoretical developments. The focus is on systems in the absence of submicroscopic bubbles (preexistent or induced) to avoid capillary bridging forces. Other possible interferences to the measurements are also eliminated. The force-distance profiles are obtained directly (no contributions from electrical double layer or hydrodynamics) between symmetric identical hydrophobic surfaces, overall charge-neutral, at the thermodynamic equilibrium and in a quenched state. Therefore in the well-defined geometry of crossed-cylinders, sphere-flat, or sphere-sphere, there is no additional interaction to be considered except the ever-present dispersion forces, negligible at large separations. For the three main categories of substrates rendered hydrophobic, namely surfaces obtained with surfactant monolayers physically adsorbed from solution to deposited ones, and substrates coated with a hydrophobizing agent bonded chemically onto the surface, the interaction energy scales as A exp (-2κD)/2κD at large separations, with measured decay lengths in accord with theoretical predictions, simply being half the Debye screening length, κ-1/2, at least in non vanishing electrolyte. Taken together with the prefactor A scaling as the ionic strength, the interaction energy is demonstrated to have an electrostatic origin in all the systems. Thanks to our recent SFAX coupling force measurements with x-ray solution scattering under controlled nano-confinement, the microstructuration of the adsorbed film emerges as an essential feature in the molecular mechanism for explaining the observed attraction of larger magnitude than dispersion forces. The adsorption of pairs of positive and negative ions on small islands along the interface, the fluctuation of the surface charge density around a zero mean-value with desorption into or adsorption from the electrolyte solution, the correlations in the local surface ion concentrations along the surfaces, the redistribution of counterions upon intersurface variation, all contribute and are tuned finely by the inhomogeneities and defects present in the hydrophobic layers. It appears that the magnitude of the interacting energy can be described by a single master curve encompassing all the systems.
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Tarongoy F, Haddad PR, Quirino JP. Admicelles in open-tube capillaries for chromatography and electrochromatography. Anal Chim Acta 2019; 1067:147-154. [PMID: 31047146 DOI: 10.1016/j.aca.2019.03.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 03/15/2019] [Accepted: 03/16/2019] [Indexed: 12/15/2022]
Abstract
Surfactant bilayers or admicelles at the solid surface-liquid interface inside 50-200 μm inner diameter (i.d.) open-tube fused-silica capillaries were developed as 'soft' stationary pseudophases for the liquid chromatographic (LC) separations of neutral and charged analytes. Admicelles were formed in-situ from buffered aqueous mobile phases with cetytrimethylammonium bromide at concentrations between the critical surface aggregation concentration and critical micelle concentration, which were determined by electroosmotic flow measurements using capillary electrophoresis. There were no micelles in the mobile phase solution. Also, there was no solid phase that is classically required in LC. Pressure and voltage driven modes or open-tubular admicellar liquid chromatography (OT-AMLC) and electrochromatography, respectively were proposed based on the separation of neutral analytes. The parameters (i.e., pH, concentration of surfactant, salt, and methanol in the mobile phase and capillary i.d.) that affected the surprising chromatographic effect of admicelles at the interface were investigated. The analytical performance of OT-AMLC for small molecules were found acceptable. Applications to environmental water and biological (HepG cell line metabolism media) samples analysis with appropriate sample preparation procedures were also conducted. The use of pseudophases at the solid surface-liquid interface could be a viable solution to problems associated with the use of solid stationary or support materials in nano- and micro-liquid chromatography and electrochromatography.
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Affiliation(s)
- Faustino Tarongoy
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences-Chemistry, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Paul Raymond Haddad
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences-Chemistry, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Joselito P Quirino
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences-Chemistry, University of Tasmania, Hobart, Tasmania, 7001, Australia.
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Kékicheff P, Contal C. Cationic-Surfactant-Coated Mica Surfaces below the Critical Micellar Concentration: 1. Patchy Structures As Revealed by Peak Force Tapping AFM Mode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3087-3107. [PMID: 30691263 DOI: 10.1021/acs.langmuir.8b03781] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The morphology and structure of the self-assembled surfactant aggregates at the solid-liquid interface remain controversial. For the well-studied system of cationic cetyltrimethylammonium bromide (C16TAB) adsorbed onto the opposite negatively charged, atomically smooth mica surface, a variety of surface aggregates have been previously reported: AFM imaging pointing to cylinders and surface micelles as opposed to mono/bilayer-like structures revealed by neutron and X-ray reflectometry, NMR, spectroscopic techniques, and numerical simulations. To reconcile with the latter results, we revisit the morphometry of the C16TAB-coated mica surfaces using the recent peak force tapping (PFT-AFM) mode that allows fragile structures to be imaged with the lowest possible applied force. The evolution of the structural organization at the mica-water interface is investigated above the Krafft boundary over a wide concentration range (from 1/1000 to 2 cmc) after long equilibration times to ensure thermodynamic equilibrium. A complex but fairly complete picture has emerged: At very low concentrations, the C16TAB surfactants adsorb as isolated molecules before forming small clusters. Above 1/140 cmc, monolayer-like stripes are formed. As the concentration is increased, a connected network of these patches progressively covers the mica substrate. Above 1/80 cmc, bilayer-like patches build on top of the underlying monolayer, and ultimately a complete bilayer (at about half the cmc) covers the entire mica substrate. Thanks to the less invasive PFT-AFM imaging mode, our observations not only agree with the theoretical predictions and numerical simulations but also reconcile, at last, the direct observations by means of the AFM imaging technique with the results obtained with other techniques.
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Affiliation(s)
- Patrick Kékicheff
- Université de Strasbourg, CNRS Institut Charles Sadron , 23 rue du Loess , 67034 Strasbourg Cedex 2, France
| | - Christophe Contal
- Université de Strasbourg, CNRS Institut Charles Sadron , 23 rue du Loess , 67034 Strasbourg Cedex 2, France
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CO2/N2-switchable high internal phase Pickering emulsion stabilized by silica nanoparticles and low-cost commercial N,N-dimethyl-N-dodecylamine. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.11.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Cockcroft JK, Shamsabadi A, Wu H, Rennie AR. Understanding the structure and dynamics of cationic surfactants from studies of pure solid phases. Phys Chem Chem Phys 2019; 21:25945-25951. [DOI: 10.1039/c9cp04486h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unravelling the phase behaviour of n-alkyltrimethylammonium bromides (C10 to C18): from tight-packed interdigitation to rotational disorder with increasing temperature.
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Affiliation(s)
| | - André Shamsabadi
- Department of Chemistry
- Christopher Ingold Laboratories
- UCL
- London WC1H 0AJ
- UK
| | - Han Wu
- Department of Chemical Engineering
- UCL
- London WC1E 7JE
- UK
| | - Adrian R. Rennie
- Centre for Neutron Scattering
- Uppsala University
- 75120 Uppsala
- Sweden
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