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Hoek H, Gerber T, Richter C, Dupuy R, Rapf RJ, Oertel H, Buttersack T, Trotochaud L, Karslıoğlu O, Goodacre D, Blum M, Gericke SM, Buechner C, Rude B, Mugele F, Wilson KR, Bluhm H. Compression of a Stearic Acid Surfactant Layer on Water Investigated by Ambient Pressure X-ray Photoelectron Spectroscopy. J Phys Chem B 2024; 128:3755-3763. [PMID: 38578662 PMCID: PMC11033867 DOI: 10.1021/acs.jpcb.4c00451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 03/14/2024] [Accepted: 03/18/2024] [Indexed: 04/06/2024]
Abstract
We present a combined Langmuir-Pockels trough and ambient pressure X-ray photoelectron spectroscopy (APXPS) study of the compression of stearic acid surfactant layers on neat water. Changes in the packing density of the molecules are directly determined from C 1s and O 1s APXPS data. The experimental data are fit with a 2D model for the stearic acid coverage. Based on the results of these proof-of-principle experiments, we discuss the remaining challenges that need to be overcome for future investigations of the role of surfactants in heterogeneous chemical reactions at liquid-vapor interfaces in combined Langmuir-Pockels trough and APXPS measurements.
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Affiliation(s)
- Harmen Hoek
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
- Physics
of Complex Fluids − MESA+institute for Nanotechnology, University of Twente,
PO Box 217, 7500 AE Enschede, The Netherlands
| | - Timm Gerber
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Clemens Richter
- Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Rémi Dupuy
- Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Rebecca J. Rapf
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Holger Oertel
- Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Tillmann Buttersack
- Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Lena Trotochaud
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Osman Karslıoğlu
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Dana Goodacre
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
- Department
of Chemical Sciences, The University of
Auckland, Auckland 1142, New Zealand
| | - Monika Blum
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Sabrina M. Gericke
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Christin Buechner
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Bruce Rude
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Frieder Mugele
- Physics
of Complex Fluids − MESA+institute for Nanotechnology, University of Twente,
PO Box 217, 7500 AE Enschede, The Netherlands
| | - Kevin R. Wilson
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Hendrik Bluhm
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
- Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
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Xu M, Tsona NT, Cheng S, Li J, Du L. Unraveling interfacial properties of organic-coated marine aerosol with lipase incorporation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 782:146893. [PMID: 33848860 DOI: 10.1016/j.scitotenv.2021.146893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/09/2021] [Accepted: 03/29/2021] [Indexed: 06/12/2023]
Abstract
Marine aerosols are believed to have an organic surface coating on which fatty acids act as an important component due to their high surface activity. In addition, various kinds of enzyme species are abundantly found in seawater, some of which have been identified to exist in marine aerosols. Herein, from the perspective of marine aerosol interface simulation, we investigate the effect of Burkholderia cepacia lipase on the surface properties of stearic acid (SA) monolayer at the air-water interface by using surface-sensitive techniques of Langmuir trough and Infrared reflection-absorption spectroscopy (IRRAS). Our findings indicate that the stearic acid film undergoes a significant expansion, especially when the lipase concentration is 500 nM, because of the incorporation of lipase as observed from the surface pressure-area (π-A) isotherms. IRRAS spectra also show reduced intensities and ordering in the methylene stretching vibration region of stearic acid as a result of low surface density and disordered packing as the enzyme concentration increases. In particular, when the concentration of lipase is 500 nM, the lowest Ias/Is values are shown on both pure water subphase and artificial seawater subphase, indicating more gauche conformations for SA. Furthermore, SA films with lipase incorporation were also studied at three different pH of subphase environment, considering the decrease of pH caused by the reaction with acidic gases during the aerosol aging process. The results reflect a more pronounced expansion of SA monolayer in acidic environment at pH 2.5, suggesting that hydrophobic interaction plays an important role in the disorder of the SA monolayer. In view of the coexistence of fatty acids and enzymes in the marine environment, this study provides a further understanding of the surface organization and behavior of organic-coated marine aerosols and deepen the knowledge of lipid-enzyme interfacial interactions occurring in the atmosphere.
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Affiliation(s)
- Minglan Xu
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
| | - Narcisse T Tsona
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
| | - Shumin Cheng
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
| | - Jianlong Li
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
| | - Lin Du
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China.
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Sowah‐Kuma D, Rehman J, Yeboah A, Bu W, Yan C, Paige MF. Iron Binding in an Ethylenediaminetetracetic Acid‐Based Gemini Surfactant Monolayer Film. J SURFACTANTS DETERG 2021. [DOI: 10.1002/jsde.12498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- David Sowah‐Kuma
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Jeveria Rehman
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Alfred Yeboah
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Wei Bu
- NSF's ChemMatCARS The University of Chicago Chicago IL 60637 USA
| | - Ci Yan
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Matthew F. Paige
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
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Castillo A, Pereira S, Otero A, Fiol S, Garcia-Jares C, Lores M. Matrix solid-phase dispersion as a greener alternative to obtain bioactive extracts from Haematococcus pluvialis. Characterization by UHPLC-QToF. RSC Adv 2020; 10:27995-28006. [PMID: 35519111 PMCID: PMC9055742 DOI: 10.1039/d0ra04378h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 07/16/2020] [Indexed: 11/28/2022] Open
Abstract
So far, research on the microalga Haematococcus pluvialis has been focused mainly on the exploitation of its high astaxanthin content, leaving aside the use of other bioactive compounds present. This study is focused on obtaining and characterizing extracts enriched in bioactive compounds from this microalga red aplanospores. This is performed by means of Matrix Solid-Phase Dispersion (MSPD) extraction process, in an environmentally friendly way with low energy consumption and GRAS solvents. The effects of extraction parameters, particularly the extraction solvents (ethanol, ethyl lactate and water) are studied, in order to obtain maximum recovery of the main antioxidant compounds of interest (carotenoids, fatty acids and derivatives). Characterization of extracts is carried out by HPLC-DAD (High Performance Liquid Chromatography Diode Array Detector) and UHPLC-QToF (Ultra High-Performance Liquid Chromatography Quadrupole Time-of-Flight). The results show that MSPD produced extracts with higher bioactive compound recoveries than conventional cell disruption extractions. At the same time, a novel untargeted characterization for this species is performed, identifying compounds not previously dated in H. pluvialis, which include 10-phenyldecanoic acid and the -oxo and -hydroxy derivatives of palmitic acid. This approach, first applied to a freshwater microalgae, characterized by rigid and resistant aplanospores, provided a synergistic and sustainable extract, giving a broader focus on the use of this microalga. Untargeted characterization and alternative extraction of carotenoids, fatty acids, and new bioactive compounds from microalga Haematococcus pluvialis using GRAS solvents.![]()
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Affiliation(s)
- Aly Castillo
- CRETUS Institute, Department of Analytical Chemistry, Nutrition and Food Science, Universidade de Santiago de Compostela Campus Vida E-15782 Santiago de Compostela Spain +34-881-814379
| | - Simón Pereira
- Astaco Technologies B.V. Remmingweg 2-4 1332 BE Almere The Netherlands
| | - Ana Otero
- Aquiculture and Biotechnology (AQUABIOTECH), Department of Microbiology and Parasitology, Universidade de Santiago de Compostela Campus Vida E-15782 Santiago de Compostela Spain
| | - Sarah Fiol
- CRETUS Institute, Department of Soil Science and Agricultural Chemistry, Universidade de Santiago de Compostela Campus Vida E-15782 Santiago de Compostela Spain
| | - Carmen Garcia-Jares
- CRETUS Institute, Department of Analytical Chemistry, Nutrition and Food Science, Universidade de Santiago de Compostela Campus Vida E-15782 Santiago de Compostela Spain +34-881-814379
| | - Marta Lores
- CRETUS Institute, Department of Analytical Chemistry, Nutrition and Food Science, Universidade de Santiago de Compostela Campus Vida E-15782 Santiago de Compostela Spain +34-881-814379
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Abstract
Sea spray aerosol (SSA) is highly enriched in marine-derived organic compounds during seasons of high biological productivity, and saturated fatty acids comprise one of the most abundant classes of molecules. Fatty acids and other organic compounds form a film on SSA surfaces, and SSA particle surface-area-to-volume ratios are altered during aging in the marine boundary layer (MBL). To understand SSA surface organization and its role during dynamic atmospheric conditions, an SSA proxy fatty acid film and its individual components stearic acid (SA), palmitic acid (PA), and myristic acid (MA) are studied separately using surface pressure–area ( Π − A ) isotherms and Brewster angle microscopy (BAM). The films were spread on an aqueous NaCl subphase at pH 8.2, 5.6, and 2.0 to mimic nascent to aged SSA aqueous core composition in the MBL, respectively. We show that the individual fatty acid behavior differs from that of the SSA proxy film, and at nascent SSA pH the mixture yields a monolayer with intermediate rigidity that folds upon film compression to the collapse state. Acidification causes the SSA proxy film to become more rigid and form 3D nuclei. Our results reveal film morphology alterations, which are related to SSA reflectivity, throughout various stages of SSA aging and provide a better understanding of SSA impacts on climate.
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Li S, Du L, Zhang Q, Wang W. Stabilizing mixed fatty acid and phthalate ester monolayer on artificial seawater. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 242:626-633. [PMID: 30014940 DOI: 10.1016/j.envpol.2018.07.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 07/09/2018] [Accepted: 07/10/2018] [Indexed: 06/08/2023]
Abstract
Phthalate esters which are widely used as industrial chemicals have become widespread contaminants in the marine environment. However, little information is available on the interfacial behavior of phthalate esters in the seawater, where contaminants generally occur at elevated concentrations and have the potential to transfer into the atmosphere through wave breaking on sea surface. We used artificial seawater coated with fatty acids to simulate sea surface microlayer in a Langmuir trough. The interactions of saturated fatty acids (stearic acid (SA) and palmitic acid (PA)) with one of the most abundant phthalate esters (di-(2-ethylhexyl) phthalate (DEHP)), were investigated under artificial seawater and pure water conditions. Pure DEHP monolayer was not stable, while more stable mixed monolayers were formed by SA and DEHP on the artificial seawater at relatively low surface pressure. Sea salts in the subphase can lower the excess Gibbs free energy to form more stable mixed monolayer. Among the ten components in the sea salts, Ca2+ ions played the major role in condensation of mixed monolayer. The condensed characteristic of the mixed SA (or PA)/DEHP monolayers suggested that the hydrocarbon chains were ordered on artificial seawater. By means of infrared reflection-absorption spectroscopy (IRRAS), we found that multiple sea salt mixtures induced deprotonated forms of fatty acids at the air-water interface. Sea salts can improve the stability and lifetime of mixed fatty acid and phthalate ester monolayer on aqueous droplets in the atmosphere. Interfacial properties of mixed fatty acid and phthalate ester monolayers at the air-ocean interface are important to help understand their behavior and fate in the marine environment.
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Affiliation(s)
- Siyang Li
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao, 266237, China
| | - Lin Du
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao, 266237, China.
| | - Qingzhu Zhang
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao, 266237, China
| | - Wenxing Wang
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao, 266237, China
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Thermodynamic Behaviour of Mixed Films of an Unsaturated and a Saturated Polar Lipid. (Oleic Acid-Stearic Acid and POPC-DPPC). COLLOIDS AND INTERFACES 2018. [DOI: 10.3390/colloids2020017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Nanocomposite biomimetic vesicles based on interfacial complexes of polyelectrolytes and colloid magnetic nanoparticles. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.07.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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9
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Niu X, Liu W, Sun S. Study of Langmuir-Blodgett films of chiral nematic liquid crystals prepared by a templating method. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Haagh MEJ, Siretanu I, Duits MHG, Mugele F. Salinity-Dependent Contact Angle Alteration in Oil/Brine/Silicate Systems: the Critical Role of Divalent Cations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3349-3357. [PMID: 28332396 PMCID: PMC5390307 DOI: 10.1021/acs.langmuir.6b04470] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 03/21/2017] [Indexed: 06/06/2023]
Abstract
The effectiveness of water flooding oil recovery depends to an important extent on the competitive wetting of oil and water on the solid rock matrix. Here, we use macroscopic contact angle goniometry in highly idealized model systems to evaluate how brine salinity affects the balance of wetting forces and to infer the microscopic origin of the resultant contact angle alteration. We focus, in particular, on two competing mechanisms debated in the literature, namely, double-layer expansion and divalent cation bridging. Our experiments involve aqueous droplets with a variable content of chloride salts of Na+, K+, Ca2+, and Mg2+, wetting surfaces of muscovite and amorphous silica, and an environment of ambient decane containing small amounts of fatty acids to represent polar oil components. By diluting the salt content in various manners, we demonstrate that the water contact angle on muscovite, not on silica, decreases by up to 25° as the divalent cation concentration is reduced from typical concentrations in seawater to zero. Decreasing the ionic strength at a constant divalent ion concentration, however, has a negligible effect on the contact angle. We discuss the consequences for the interpretation of core flooding experiments and the identification of a microscopic mechanism of low salinity water flooding, an increasingly popular, inexpensive, and environment-friendly technique for enhanced oil recovery.
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Bera B, Duits MHG, Cohen Stuart MA, van den Ende D, Mugele F. Surfactant induced autophobing. SOFT MATTER 2016; 12:4562-4571. [PMID: 27102975 DOI: 10.1039/c6sm00128a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Surfactant adsorption in a three-phase system and its influence on wetting properties are relevant in various applications. Here, we report a hitherto not observed phenomenon, namely the retraction of an aqueous drop on hydrophilic solid substrates (which we refer to as 'autophobing') in ambient oil containing water-insoluble fatty acids, caused by the deposition of these fatty acids from the ambient oil onto the solid substrate. AFM measurements confirm that the surfactant is deposited on the solid by the moving contact line. This leads to a more hydrophobic substrate, the retraction of the contact line and a concomitant increase in the contact angle. The deposition process is enabled by the formation of a reaction product between deprotonated fatty acids and Ca(2+) ions at the oil/water interface. We investigate how the transition to a new equilibrium depends on the concentrations of the fatty acids, the aqueous solute, the chain lengths of the fatty acid, and the types of alkane solvent and silica or mica substrates. This phenomenon is observed on both substrates and for all explored combinations of fatty acids and solvents and thus appears to be generic. In order to capture the evolution of the contact angle, we develop a theoretical model in which the rate of adsorption at the oil-water interface governs the overall kinetics of autophobing, and transfer to the solid is determined by a mass flux balance (similar to a Langmuir Blodgett transfer).
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Affiliation(s)
- B Bera
- Physics of Complex Fluids (PCF) Group, MESA + Institute of Technology, University of Twente, Enschede, The Netherlands.
| | - M H G Duits
- Physics of Complex Fluids (PCF) Group, MESA + Institute of Technology, University of Twente, Enschede, The Netherlands.
| | - M A Cohen Stuart
- Physics of Complex Fluids (PCF) Group, MESA + Institute of Technology, University of Twente, Enschede, The Netherlands.
| | - D van den Ende
- Physics of Complex Fluids (PCF) Group, MESA + Institute of Technology, University of Twente, Enschede, The Netherlands.
| | - F Mugele
- Physics of Complex Fluids (PCF) Group, MESA + Institute of Technology, University of Twente, Enschede, The Netherlands.
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