Connecting wettability, topography, and chemistry in a simple lipid-montmorillonite system

Kessenich, Brenda L.; Pokhrel, Nihit; Nakouzi, Elias; Newcomb, Christina J.; Flury, Markus; Maibaum, Lutz; Yoreo, James J. De

doi:10.1016/j.jcis.2019.07.075

Cited by 7 publications

(14 citation statements)

References 47 publications

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“…Wettability was measured with the water contact angle, flow viscosity, and kinetics of infiltration. A complete description of the methods and materials used is provided in Kessenich et al, and the associated supplement …”

Section: Methodsmentioning

confidence: 99%

“…The system was modeled the same way as in our previous paper using a CLAYFF force field for the montmorillonite, CHARMM36 force field for the lipids, and the TIP3P force field for the water . The shapes of the DSPG lipid aggregates were also inferred in a similar way; we computed the density of tail carbon atoms and head phosphorous atoms, as DSPG does not have a nitrogen atom in the headgroup.…”

Section: Methodsmentioning

confidence: 99%

“…Previously, we analyzed a system of montmorillonite and zwitterionic phosphatidylethanolamine (PE) lipids . One saturated PE lipid, 1,2-distearoyl- sn -glycero-3-phosphoethanolamine (DSPE), and one unsaturated PE lipid, 1,2-dioleoyl- sn -glycero-3-phosphoethanolamine (DOPE), were studied to determine if the state of the lipidliquid or solidaltered wettability.…”

Section: Introductionmentioning

confidence: 99%

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Negatively Charged Lipids Exhibit Negligible Effects on the Water Repellency of Montmorillonite Films

et al. 2020

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Amphiphilic molecules can alter the wettability of soil minerals. To determine how the headgroup chemistry of amphiphiles determines these effects, we investigate a system of the clay montmorillonite with long-chain phospholipids. We use phosphatidylglycerol (PG) phospholipids to contrast with our previous work using phosphatidylethanolamine (PE) lipids. Zwitterionic PE lipids can sorb to the negatively charged montmorillonite surface, whereas negatively charged PG lipids cannot. Employing a suite of techniques from molecular dynamics, atomic force microscopy, fluorescence microscopy, and contact angle measurements, we define sample characteristics from molecular-scale structure to the macroscopic wettability. We find that PG lipids do not significantly alter montmorillonite wetting characteristics, such as the contact angle, flow viscosity, and the characteristic time scale for droplet imbibition. On comparing PE and PG lipid/clay films, we find that, among the phospholipids compared, they must have three characteristics to change clay/lipid film wettability: they must bind to the mineral surface, be solid at room temperature, and have a relatively continuous distribution throughout the film.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Negatively Charged Lipids Exhibit Negligible Effects on the Water Repellency of Montmorillonite Films

et al. 2020

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“…The wettability of solid surfaces plays important roles not only in industrial applications [1][2][3] but also in daily life [4][5][6]. It is a characteristic property of materials and it is determined by two factors: one is the chemical component of the surface and the other is the surface topology [7][8][9][10][11][12][13][14]. Superhydrophobic surfaces (SHSs) with a water contact angle (WCA) larger than 150 • have attracted interest due to developments in nanotechnology and their applications in industry [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic/Oleophilic Structures Based on MacroPorous Silicon: Effect of Topography and Fluoroalkyl Silane Functionalization on Wettability

Formentı́n

Marsal

2021

Nanomaterials

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The effect of the morphology and chemical composition of a surface on the wettability of porous silicon structures is analyzed in the present work. Hydrophobic and superhydrophobic macroporous substrates are attractive for different potential applications. Herein, different hydrophobic macroporous silicon structures were fabricated by the chemical etching of p-type silicon wafers in a solution based on hydrofluoric acid and coated with a fluoro silane self-assembled monolayer. The surface morphology of the final substrate was characterized using a scanning electron microscope. The wettability was assessed from contact angle measurements using water and organic solvents that present low surface energy. The experimental data were compared with the classical wetting states theoretical models described in the literature. Perfluoro-silane functionalized macroporous silicon surfaces presented systematically higher contact angles than untreated silicon substrates. The influence of porosity on the surface wettability of macoporous silicon structures has been established. These results suggest that the combination of etching conditions with a surface chemistry modification could lead to hydrophobic/oleophilic or superhydrophobic/oleophobic structures.

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“…Indeed, the common strategies used to control rough surface topographies at the nanoscale consist of physical processes based on lithography and physical vapor deposition techniques, chemical processes, including etching, oxidation, etc., and self-assembly of nano objects . Among all these procedures, only a few techniques may lead to successful roughening with almost homogeneous chemical composition, such as supersonic cluster beam deposition (SCBD) and glancing angle deposition (GLAD). , Accordingly, decoupling topography from surface chemistry remains experimentally rare. − Third, and more decisively, the choice of the relevant parameters, which provide a quantitative description of the surface morphology is not obvious. In situations with common occurrence, surfaces of metals and oxides exhibit random topographies, which may be fully described by a n -point height probability distribution p n ({( x i , y i )} i =1,..., n ;{ z i } i =1,..., n ) such that p n .d z 1 ···d z n gives the probability that the heights z n of the surface at n points of lateral coordinates ( x n , y n ) are simultaneously comprised between z i and z i + d z i , respectively.…”

Section: Introductionmentioning

confidence: 99%

Fatty Acid Monolayers on Randomly Nanostructured Inorganic Surfaces: Interplay of Wettability, Chemistry, and Topography

Beauvais¹,

Liaščukienė

Jonas³

et al. 2020

Langmuir

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Understanding the wetting properties of chemically modified inorganic surfaces with random nanoscale topographies is of fundamental importance for diverse applications. This issue has hitherto continuously been the subject of considerable controversies. Herein, we report a thorough investigation of the wettability–topography–chemistry balance for a nanostructured surface with random topography, the main challenge being decoupling topography from surface chemistry. For this purpose, we use a superficially nanostructured aluminum substrate chemically modified by fatty acid monolayers. From atomic force microscopic data, we extract a variety of parameters describing the surface topography by means of variogram calculations, a method originally developed by geostatisticians to explore large surfaces. Moreover, by using log and power transforms, we establish a consistent relationship relating wettability, topography, and surface chemistry. Interestingly, we demonstrate that the water contact angle comprises a contribution due to the surface composition, originating from hydrophobization through alkyl chains, and a contribution due to the surface topography, particularly its stochastic feature. This model is valid in the Wenzel region; it provides guidelines for tuning the wetting properties of inorganic surfaces with random nanoscale topographies.

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Connecting wettability, topography, and chemistry in a simple lipid-montmorillonite system

Cited by 7 publications

References 47 publications

Negatively Charged Lipids Exhibit Negligible Effects on the Water Repellency of Montmorillonite Films

Negatively Charged Lipids Exhibit Negligible Effects on the Water Repellency of Montmorillonite Films

Hydrophobic/Oleophilic Structures Based on MacroPorous Silicon: Effect of Topography and Fluoroalkyl Silane Functionalization on Wettability

Fatty Acid Monolayers on Randomly Nanostructured Inorganic Surfaces: Interplay of Wettability, Chemistry, and Topography

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