Theoretical investigations on the superhydrophobicity of intrinsic hydrophilic surfaces with overhang microstructures

Xu, Peng; Bai, Jiajing; Zhou, Peng; Wang, L. L.; Sun, Xiaobin; Wei, Lai; Zhou, Q.

doi:10.1039/d1ra04004a

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…However, the surface nanoroughness must still be maintained, because a too dense structure will gradually result in a closure of the porous network, decreasing the water repellence. [ 24 ] Moreover, since the surface roughness of the M13 fiber bundles can be controlled, it might be possible to further tune the degree of the apolar properties for the replicated structures.…”

Section: Resultsmentioning

confidence: 99%

Development of Unconventional Nano‐Metamaterials from Viral Nano‐Building Blocks

Passaretti

Schofield

Rickard

et al. 2022

Advanced Optical Materials

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example is the invisibility cloak, just like in the Harry Potter movies. Once it is slipped over something, it makes the object vanish. A possible real-world implementation of this "magical" garment is based on optical metamaterials, which are periodic structures at the nanoscale. Correctly designed nanostructures can guide light waves around an object, reminiscent of a rock diverting water in a stream, and effectively making it invisible. Additionally, nanostructures with periodicities that are comparable to the light wavelength, typically 200-1000 nm, i.e., photonic bandgap (PBG) materials, can trap certain colors of light. On the other hand, photonic metamaterials are based on the periodically arranged structures on the sub-100-nm length scale, which have the capability to modulate electromagnetic waves in an unusual fashion and are predicted to produce super-lenses, stealth or cloaking devices. [1] PBG metamaterials are another class of dielectric nanostructures which have patterning at the wavelength as well as sub-wavelength scale or just the latter but create a photonic band gap as well as result in negative refraction or other unusual effects. [2] They have a wavelength band gap in which light propagation is forbidden. Selective trapping and control of light propagation enables engineering the fundamental properties Structured metamaterials are periodically arranged nanostructures in which the dielectric constant is periodically modulated on a length-scale comparable to the desired wavelength of operation. Interactions of the electric fields of light waves with the sub-wavelength unit structures can produce effects that are impossible in natural materials. Here, a technique to construct three-dimensional (3D) metamaterials using self-assembling M13 viral building-blocks as templates which are then replicated into a metal quasi-3D nanostructure is developed. By correct fit of virus fragments, it is possible to employ them in a LEGO-like way to build up well-defined structures on the nanoscale. The virus blocks are designed to spontaneously assemble into 3D-periodic network structures with interesting optical properties. Subsequently, templating of these nanostructures into inorganic materials allows the replication of their network into an inverse periodic metal structure, which has the appropriate architecture for optical metamaterials. Establishing such a technique provides an important link toward the realization of applied metamaterials potentially heralding a new era for developing novel types of bio-synthetic optical materials. These materials have a wide range of potential uses including cloaking materials, light-storage devices, high-speed optical computers and nano-lasers, and will offer numerous applications in transformation optics.

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Section: Resultsmentioning

confidence: 99%

Development of Unconventional Nano‐Metamaterials from Viral Nano‐Building Blocks

Passaretti

Schofield

Rickard

et al. 2022

Advanced Optical Materials

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“…Besides this surface chemistry of functional groups, wetting behavior is influenced by a variety of parameters, including interfacial energy, surface roughness, and the size of pores where the air is trapped. 27 The wetting properties of a solid surface can be evaluated by measuring water contact angle (WCA), and Figure 1 illustrates several WCA models to match each optimal state. [28][29][30][31][32] For flat surfaces of zero curvature, Young's theory in Figure 1(a) explains the theoretical state of WCA on a smooth and homogeneous surface.…”

Section: Introductionmentioning

confidence: 99%

Reinforced tensile strength and wettability of nanofibrous electrospun cellulose acetate by coating with waterborne polyurethane and graphene oxide

Kim

2022

Journal of Engineered Fibers and Fabrics

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Nanotechnology has made biocompatible nanofibers grow in the healthcare industry. Herein, a cellulose acetate (CA) electrospun membrane was characterized by nanofibers of 438 (nm) in diameter between virus and bacteria, pore areas of 36.3%, and a pore size of 395 ± 263 (nm). This structure led to excellent air-water transfer through pore connectivity, contributing to sufficient wettability, air permeability, and water vapor transmission rate (WVTR). The air permeability of pristine CA membranes became predictable through multiple linear regression, based on the correlation to thickness, bulk density (Pearson’s coefficients: 0.754, −0.538). Nonetheless, the tensile strength of the pristine CA needed to be reinforced by spray coating with waterborne polyurethane (WPU) and graphene oxide (GO). The WPU/GO 6:1 (v/v) ratio was optimal due to the increase in ultimate tensile stress to 132.96% due to a synergy of GO’s covalent bonds with WPU’s hard segments and elongation at break to 113.40% from WPU polyols. The WPU/GO 6:1 coated CA membrane possessed still comparable air permeability (36.53 l/m2/s), and WVTR (5736 g/m2/day). Its rapid wetting transition from the Cassie-Baxter’s to Wenzel’s state was attributed to GO’s hydrophilic functional groups. These achievements in reinforcement of tensile strength and wettability would pave the way for filtration, and wound dressing.

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Quaternary phosphonium AIEgens nanoparticles as innovative agents for developing latent fingerprints

Huang,

Chen,

Chien

et al. 2024

Analytica Chimica Acta

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Theoretical investigations on the superhydrophobicity of intrinsic hydrophilic surfaces with overhang microstructures

Abstract: Free energy variations with contact angle.

Cited by 3 publications

References 34 publications

Development of Unconventional Nano‐Metamaterials from Viral Nano‐Building Blocks

Development of Unconventional Nano‐Metamaterials from Viral Nano‐Building Blocks

Reinforced tensile strength and wettability of nanofibrous electrospun cellulose acetate by coating with waterborne polyurethane and graphene oxide

Quaternary phosphonium AIEgens nanoparticles as innovative agents for developing latent fingerprints

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