Surface characteristics of water-repellent polyelectrolyte multilayer films containing various silica contents

Jindasuwan, Sunisa; Nimittrakoolchai, On-Uma; Sujaridworakun, Pornapa; Jinawath, Supatra; Supothina, Sitthisuntorn

doi:10.1016/j.tsf.2009.03.116

Cited by 24 publications

(16 citation statements)

References 19 publications

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“…Purified water droplets (volume of 5.0 μ L) were gently placed onto the film surfaces and the average values measured at six different locations of each sample were taken. In order to found the apparent surface energy, γ s tot , of the monolayers, we have used the following relation:

where γ l is the surface tension of water, θ adv is the contact angle of advance, and θ rec is the receding contact angle [ 15 ]. Design and geometry optimization of SinA molecular were carried out in vacuum using MNDO method [ 16 ] implemented in ArgusLab 4.1 software [ 17 ].…”

Section: Methodsmentioning

confidence: 99%

Photoresponsive Wettability in Monolayer Films from Sinapinic Acid

Moura

Gomes²,

Souza³

et al. 2013

The Scientific World Journal

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Sinapinic acid is an interesting material because it is both antioxidant and antibacterial agent. In addition, when illuminated with ultraviolet light, it can exhibit the so-called photodimerization process. In this paper, we report on the investigation of monolayer films from 3,5-dimethoxy-4-hydroxycinnamic acid (sinapinic acid, SinA) deposited onto poly(allylamine hydrochloride), PAH, films. SinA monolayers were prepared by using the layer-by-layer (LbL) self-assembly technique. Adsorption kinetics curves were well fitted by a biexponential function suggesting that the adsorption process is determined by two mechanisms: nucleation and growth of aggregates. By using wetting contact angle analysis, we have found that SinA monolayers exhibit photoresponsive wettability under UV irradiation (365 nm); that is, wettability decreases with increasing UV irradiation time. The photoresponse of wettability was attributed to photodimerization process. This hypothesis was supported by the dependence of surface morphological structure and absorption on UV irradiation time. The mechanism found in the well-known transcinnamic acid crystals is used to explain the photodimerization process in SinA monolayers.

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Section: Methodsmentioning

confidence: 99%

Photoresponsive Wettability in Monolayer Films from Sinapinic Acid

Moura

Gomes²,

Souza³

et al. 2013

The Scientific World Journal

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“…Through superhydrophobic coatings, the concept of self-cleaning glass materials showed a maturing research trend between 2009 and 2017, with 1125 research articles being published (ScienceDirect keywords: “self-cleaning glass, superhydrophobic glass”). These coatings can be fabricated using top-down approaches such as template-based, photolithographic, and surface plasma treatment [ 178 ], or top-down methods such as chemical modification [ 179 ], colloidal assembly [ 180 ], layer-by-layer deposition [ 181 ], and sol-gel methods [ 182 ] can also be applied [ 74 ].…”

Section: Photovoltaics Enhanced With Micro-structuringmentioning

confidence: 99%

Colloidal Lithography for Photovoltaics: An Attractive Route for Light Management

et al. 2021

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The pursuit of ever-more efficient, reliable, and affordable solar cells has pushed the development of nano/micro-technological solutions capable of boosting photovoltaic (PV) performance without significantly increasing costs. One of the most relevant solutions is based on light management via photonic wavelength-sized structures, as these enable pronounced efficiency improvements by reducing reflection and by trapping the light inside the devices. Furthermore, optimized microstructured coatings allow self-cleaning functionality via effective water repulsion, which reduces the accumulation of dust and particles that cause shading. Nevertheless, when it comes to market deployment, nano/micro-patterning strategies can only find application in the PV industry if their integration does not require high additional costs or delays in high-throughput solar cell manufacturing. As such, colloidal lithography (CL) is considered the preferential structuring method for PV, as it is an inexpensive and highly scalable soft-patterning technique allowing nanoscopic precision over indefinitely large areas. Tuning specific parameters, such as the size of colloids, shape, monodispersity, and final arrangement, CL enables the production of various templates/masks for different purposes and applications. This review intends to compile several recent high-profile works on this subject and how they can influence the future of solar electricity.

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“…The geometry of these honeycomb structures is easily tuned to modulate the superhydrophobicity. Instead of a honeycomb‐like structure, a hierarchical porous structure can also be fabricated by simple polyelectrolyte/silica nanoparticles assembly, which can create the appropriate roughness for a superhydrophobic surface . Also, polyelectrolyte/silica multilayers have been applied onto cotton fabrics to create superhydrophobic coatings .…”

Section: Superhydrophobicity and Superoleophobicity: Bio‐inspired Surmentioning

confidence: 99%

“…Instead of a honeycomb-like structure, a hierarchical porous structure can also be fabricated by simple polyelectrolyte/silica nanoparticles assembly, which can create the appropriate roughness for a superhydrophobic surface. 72,73 Also, polyelectrolyte/silica multilayers have been applied onto cotton fabrics to create superhydrophobic coatings. 73 A first bilayer of PAH/PAA enhances adhesion to the cotton fibers, after which a rough silica nanoparticle-containing multilayer of PAH/SiO 2 and finally a fluorinated silane are applied to the cotton to achieve superhydrophobicity.…”

Section: Reviewmentioning

confidence: 99%

Functional polyelectrolyte multilayer assemblies for surfaces with controlled wetting behavior

Huang

Zacharia

2015

J of Applied Polymer Sci

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Controlled wetting at surfaces and interfaces is an important area of research with numerous potential commercial applications. Both superhydrophobicity and superhydrophilicity can be used to enable applications such as self-cleaning, dropwise condensation, or antifogging. Many strategies for creating such surfaces center around biomimicry, replicating the structure of the lotus leaf, for example. Given the potential impact, creating surfaces with these properties using any number of fabrication is of great interest. One very promising fabrication technique, however, for creating these surfaces is the layer-by-layer (LbL)-directed self-assembly of polyelectrolytes and other charged materials. LbL is a sequential adsorption technique wherein a surface is exposed to first a solution of one charge and then a solution of the opposite charge. LbL has many advantages, including the ability to incorporate many different types of materials and therefore functionality, the ability to conformally coat substrates of complex geometry, and environmentally friendly aqueous processing. This review describes recent progress in using LbL to create surfaces with controlled wetting.

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Surface characteristics of water-repellent polyelectrolyte multilayer films containing various silica contents

Cited by 24 publications

References 19 publications

Photoresponsive Wettability in Monolayer Films from Sinapinic Acid

Photoresponsive Wettability in Monolayer Films from Sinapinic Acid

Colloidal Lithography for Photovoltaics: An Attractive Route for Light Management

Functional polyelectrolyte multilayer assemblies for surfaces with controlled wetting behavior

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