Theoretical Investigation of Wenzel and Cassie Wetting States on Porous Films and Fiber Meshes

Onda, Tomohiro

doi:10.1021/acs.langmuir.2c01847

Cited by 7 publications

(2 citation statements)

References 34 publications

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“…To clarify the effect of NA and CNA on the hydrophobicity of the film, the static water contact angle is also measured (Figure S2, Supporting Information) from 56.6° (control) to 69.7° (NA) and 78.3° (CNA). On the basis of Wenzel's theory, [ 38 ] in the case of under 90° contact angle, the increase in hydrophobicity can be attributed to the decrease in surface roughness, which supports the atomic force microscopy (AFM) results below ( Figure 3 a). This is further demonstrated by the reduction of the perovskite roughness from 27.3 (control) to 20.0 (NA) and 15.6 nm (CNA) after modification to form films with more uniform and dense surfaces.…”

Section: Resultssupporting

confidence: 81%

Manipulating Electron Density Distribution of Nicotinamide Derivatives Toward Defect Passivation In Perovskite Solar Cells

Liu,

Zheng,

et al. 2023

Advanced Energy Materials

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The design of additives mainly involves selection of functional groups with coordination relationships with defects in perovskite materials. However, it is particularly important to further adjust the geometrical configuration and electronic structure of an additive. Here, the nicotinamide (NA) and its derivative 6‐Methylnicotinamide (CNA) with electron‐donor functional groups are comparatively analyzed to investigate the effect of molecular dipole and electronic configuration on the defect passivation of perovskite absorbers and the photovoltaic properties of perovskite solar cells (PSCs). Theoretical calculations demonstrate that the CNA molecule with its large molecular dipole combine with the undercoordinated Pb2+ ions in perovskite to form a higher binding energy, which is beneficial to improve the formation energy of Pb‐related defects. Experimental characterization confirms that the CNA molecule significantly enhances the coordination effect between acylamino and undercoordinated defective Pb2+ cations, which is conducive to obtain high‐quality, low‐defect density of state, large grain size, and smooth surface perovskite absorbers. Thanks to the electronic configuration and electronic cloud distribution of CNA molecules, the PSCs yield impressive efficiency as high as 24.33% with excellent environmental storage, heat, and light stabilities. This research provides a research basis for designing additives with steric‐charge‐dependence to assist perovskite photovoltaics.

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Section: Resultssupporting

confidence: 81%

Manipulating Electron Density Distribution of Nicotinamide Derivatives Toward Defect Passivation In Perovskite Solar Cells

Liu,

Zheng,

et al. 2023

Advanced Energy Materials

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“…Emami et al [8] simplifies two-layer fibrous structure as a plane to explore the influence of fiber orientation on the CB stability. In addition, Onda [9] built a model for the equilibrium contact angle on fibrous structure, which is simplified as a porous film, so the equilibrium contact angle is related to volume porosity, film thickness, etc.…”

Section: Introductionmentioning

confidence: 99%

A Facile and Strategic Approach to Superhydrophobic Fibrous Structure with Biaxially Aligned Electrospun Porous Fibers

Zhang,

Li,

Huang

et al. 2023

Adv Materials Inter

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Electrospun fibrous structures can be developed superhydrophobic while remaining breathable. However, current electrospinning‐based methods for developing superhydrophobicity require complex fabrication processes and multiple raw materials, lacking a facile approach to superhydrophobicity using electrospun fibers. Inspired by a cultural relic known as Plain Gauze Gown, a fibrous structure consisting two layers of porous fibers aligned in warp and weft directions by simple electrospinning is developed. Through investigation of wetting behavior, an unique Cassie–Baxter‐“restoring” (CaRe) wetting contributing to a stable Cassie–Baxter state is unveiled in the developed structure. The CaRe wetting ensures that droplet stays on the upper‐layer fibers even at a sparse inter‐fiber distance, enabling strategically reaching superhydrophobicity by lowering structure solidity. Remarkably, the developed structure with water contact angle between 159° and 162° and roll‐off angle from 10° to 3° has a water vapor transmission rate of 20.8 kg m−2 d−1, which is the highest value among all superhydrophobic electrospun structures reported, and it is also waterproof and semi‐transparent. These features make the structure suitable for a wide range of applications, including developing waterproof, breathable, and superhydrophobic membrane with simple preparation and low cost, and as a surface layer for wearable electronics that facilitates sweat evaporation and prevents water intrusion.

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Developing “Lotus” Superhydrophobicity Using Aligned Porous Fibers

Zhang

2024

Synthesis Lectures on Green Energy and Technology

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Theoretical Investigation of Wenzel and Cassie Wetting States on Porous Films and Fiber Meshes

Cited by 7 publications

References 34 publications

Manipulating Electron Density Distribution of Nicotinamide Derivatives Toward Defect Passivation In Perovskite Solar Cells

Manipulating Electron Density Distribution of Nicotinamide Derivatives Toward Defect Passivation In Perovskite Solar Cells

A Facile and Strategic Approach to Superhydrophobic Fibrous Structure with Biaxially Aligned Electrospun Porous Fibers

Developing “Lotus” Superhydrophobicity Using Aligned Porous Fibers

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