A numerical solution to the effects of surface roughness on water–coal contact angle

Liu, Chong; Zhang, Jian; Han, Jun; Yao, Banghua

doi:10.1038/s41598-020-80729-9

Cited by 101 publications

(62 citation statements)

References 15 publications

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“…Overall, the tendency is downward. Wenzel reasoned that the presence of a rough surface would increase the actual solid–liquid contact area above the region shown on the surface geometry, hence, increasing hydrophilicity [ 37 ]. According to Equation (5),

is the contact angle of the Wenzel theory;

is Young’s angle of Wenzel’s theory; and

is the ratio of the actual surface area to the apparent surface area of the rough surface.…”

Section: Resultsmentioning

confidence: 99%

Molecular Compatibility and Hydrogen Bonding Mechanism of PES/PEI Blends

Zhu

Gao

et al. 2022

Polymers

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The development of high-performance polymer membranes has sparked a lot of attention in recent years. Polymer blending is a potential method of modification. A limitation, however, is the compatibility of blends at the molecular level. In this investigation, polyethersulfone/polyetherimide hollow fiber membranes were prepared by the solution blending method. Compatibility, hydrogen bonding, crystallinity, microstructure, hydrophilicity, mechanical properties, and transmissibility of blended membranes were also characterized. The compatibility and hydrogen bonding action of the two components were confirmed by DSC, FTIR, XPS, and XRD. The structure exhibits a C−H···O interaction motif with the sulfone group acting as a hydrogen bond acceptor from a methyl C−H donor. The π–π stacking between the two polymers arranged molecules more orderly, resulting in enhanced intermolecular interactions. Compared to polyethersulfone hollow fiber membranes, the hydrophilic, mechanical properties, and rejection rate of the blended membranes are more effectively enhanced. Self-assembly of the host polymer with a polymer capable of forming hydrogen bonds to construct controllable blends is a crucial and proven method.

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is the contact angle of the Wenzel theory;

is Young’s angle of Wenzel’s theory; and

is the ratio of the actual surface area to the apparent surface area of the rough surface.…”

Section: Resultsmentioning

confidence: 99%

Molecular Compatibility and Hydrogen Bonding Mechanism of PES/PEI Blends

Zhu

Gao

et al. 2022

Polymers

View full text Add to dashboard Cite

show abstract

“…The water contact angle value on the oil side is higher than on the water side. As the roughness factors for both sides are relatively low, the surface topography cannot explain the large differences in the water contact angle values . Hence, we presume that the higher water contact angle (lower surface energy) arises from the partial re-organization of the C 10 (NGly 4 ) 2 molecules on the oil side of the interface.…”

Section: Resultsmentioning

confidence: 88%

Two-Dimensional Triblock Peptide Assemblies for the Stabilization of Pickering Emulsions with pH Responsiveness

Calicchia

Jurewicz

Muñoz

et al. 2022

ACS Appl. Mater. Interfaces

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A variety of two-dimensional (2D) nanomaterials, including graphene oxide and clays, are known to stabilize Pickering emulsions to fabricate structures for functions in sensors, catalysts, and encapsulation. We introduce here a novel Pickering emulsion using self-assembled amphiphilic triblock oligoglycine as the emulsifier. Peptide amphiphiles are more responsive to environmental changes (e.g., pH, temperature, and ionic strength) than inorganic 2D materials, which have a chemically rigid, in-plane structure. Noncovalent forces between the peptide molecules change with the environment, thereby imparting responsiveness. We provide new evidence that the biantennary oligoglycine, Gly 4 − NH−C 10 H 20 −NH−Gly 4 , self-assembles into 2D platelet structures, denoted as tectomers, in solution at a neutral buffered pH using small-angle X-ray scattering and molecular dynamics simulations. The molecules are stacked in the platelets with a linear conformation, rather than in a U-shape. We discovered that the lamellar oligoglycine platelets adsorbed at an oil/water interface and stabilized oil-in-water emulsions. This is the first report of 2D oligoglycine platelets being used as a Pickering stabilizer. The emulsions showed a strong pH response in an acidic environment. Thus, upon reducing the pH, the protonation of the terminal amino groups of the oligoglycine induced disassembly of the lamellar structure due to repulsive electrostatic forces, leading to emulsion destabilization. To demonstrate the application of the material, we show that a model active ingredient, β-carotene, in the oil is released upon decreasing the pH. Interestingly, in pH 9 buffer, the morphology of the oil droplets evolved over time, as the oligoglycine stabilizer created progressively a thicker interfacial layer. This demonstration opens a new route to use self-assembled synthetic peptide amphiphiles to stabilize Pickering emulsions, which can be significant for biomedical and pharmaceutical applications.

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“…A rougher surface increases the effective surface area to react with the upper layer, resulting in a smaller water contact angle, as shown in Figure S7, Supporting Information. [ 38 ] The water contact angles of PVK, PVK 0.75 –CBP 0.25 , PVK 0.5 –CBP 0.5 , PVK 0.25 –CBP 0.75 , and CBP were 61°, 56°, 45°, 33°, and 27°, respectively. The contact angle represents the wettability of the different HTLs with the perovskite precursor solution.…”

Section: Resultsmentioning

confidence: 99%

Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

Baek

Kim

et al. 2022

Adv Funct Materials

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Perovskite light-emitting diodes (PeLEDs) have garnered considerable interest in recent years owing to their unique optoelectronic properties. However, the performance of PeLEDs is limited by their low quantum efficiency and unbalanced charge injection. In this study, to address these issues, a novel co-hole transport layer (HTL) of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) and poly(9-vinylcarbazole) (PVK) is introduced into PeLEDs. By optimizing the composition ratio of CBP and PVK, the performance of CsPbBr 3 -based PeLEDs is significantly improved via efficient Förster resonant energy transfer and an enhanced charge transfer owing to the well-aligned energy levels of the HTLs with the emission layers. The PeLED with an optimized composition ratio of the PVK 0.5 -CBP 0.5 HTL exhibits the best device performance with a luminance of 31641 cd•m −2 , current efficiency of 39.2 cd•A −1 , and external quantum efficiency of 15.4%. Thus, the proposed strategy engineering dual transfer of energy and charge is expected to be revolutionary in the field of PeLED research.

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A numerical solution to the effects of surface roughness on water–coal contact angle

Cited by 101 publications

References 15 publications

Molecular Compatibility and Hydrogen Bonding Mechanism of PES/PEI Blends

Molecular Compatibility and Hydrogen Bonding Mechanism of PES/PEI Blends

Two-Dimensional Triblock Peptide Assemblies for the Stabilization of Pickering Emulsions with pH Responsiveness

Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

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