Highly conjugated carbazole-based monomers for the control of nanotubular surface structures by soft template electropolymerization

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Caroline Fradin ◽  
Frédéric Guittard ◽  
Thierry Darmanin
Keyword(s):  
Organic Solvent ◽  
Dynamical Behavior ◽  
Surface Hydrophobicity ◽  
Surface Structures ◽  
Soft Template ◽  
Strong Increase ◽  
Nanostructured Surfaces ◽  
Constant Potential ◽  
Water Adhesion ◽  
Vertically Aligned

Abstract In this work, a bioinspired approach is used to prepare nanotubular structures with tunable hydrophobicity and water adhesion by a soft template surfactant-free electropolymerization in organic solvent. Various highly conjugated carbazole-based molecules are used as monomer. The presence of water in the organic solvent enables the formation of porous and rough nanostructures. Their shapes depend essentially on the nature of the monomer and the way it polymerizes. Various morphologies were obtained from nanoparticles network to horizontally or vertically aligned nanotubes. The nanostructured surfaces reach superhydrophobic properties and their dynamical behavior varies with the monomer from sticky to slippery. For example, using 9,3′:6′,9″-tercarbazole (TC) very long nanotubes are observed but their number is higher at constant potential. At high deposition charge, it is observed that most of the tubes are even collapsed leading to a strong increase of surface hydrophobicity with apparent contact angle up to 143° with strong water adhesion comparable to rose petals or gecko foot.

scholarly journals Review of Micro–Nanoscale Surface Coatings Application for Sustaining Dropwise Condensation

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 117 ◽  
Author(s):  
Shoukat Alim Khan ◽  
Furqan Tahir ◽  
Ahmer Ali Bozdar Baloch ◽  
Muammer Koc
Keyword(s):  
Heat Transfer ◽  
Noble Metals ◽  
Power Plants ◽  
Contact Angle Hysteresis ◽  
Surface Hydrophobicity ◽  
Future Research ◽  
Dropwise Condensation ◽  
Nanostructured Surfaces ◽  
Research Guidelines ◽  
Coating Methods

Condensation occurs in most of the heat transfer processes, ranging from cooling of electronics to heat rejection in power plants. Therefore, any improvement in condensation processes will be reflected in the minimization of global energy consumption, reduction in environmental burdens, and development of sustainable systems. The overall heat transfer coefficient of dropwise condensation (DWC) is higher by several times compared to filmwise condensation (FWC), which is the normal mode in industrial condensers. Thus, it is of utmost importance to obtain sustained DWC for better performance. Stability of DWC depends on surface hydrophobicity, surface free energy, condensate liquid surface tension, contact angle hysteresis, and droplet removal. The required properties for DWC may be achieved by micro–nanoscale surface modification. In this survey, micro–nanoscale coatings such as noble metals, ion implantation, rare earth oxides, lubricant-infused surfaces, polymers, nanostructured surfaces, carbon nanotubes, graphene, and porous coatings have been reviewed and discussed. The surface coating methods, applications, and enhancement potential have been compared with respect to the heat transfer ability, durability, and efficiency. Furthermore, limitations and prevailing challenges for condensation enhancement applications have been consolidated to provide future research guidelines.

Tunable Water Adhesion on Titanium Oxide Surfaces with Different Surface Structures

2012 ◽  
Vol 4 (11) ◽  
pp. 5737-5741 ◽  
Author(s):  
Junfei Ou ◽  
Weihua Hu ◽  
Changquan Li ◽  
Ying Wang ◽  
Mingshan Xue ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Surface Structures ◽  
Oxide Surfaces ◽  
Water Adhesion

Reduced bacterial adhesion on zirconium-based bulk metallic glasses by femtosecond laser nanostructuring

2019 ◽  
Vol 234 (4) ◽  
pp. 387-397 ◽  
Author(s):  
Cezhi Du ◽  
Chengyong Wang ◽  
Tao Zhang ◽  
Xin Yi ◽  
Jianyi Liang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Metallic Glasses ◽  
Bacterial Adhesion ◽  
Bulk Metallic Glasses ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Adhesion Properties ◽  
Nanostructured Surfaces

As high-performing materials, bulk metallic glasses have attracted widespread attention for biomedical applications. Herein, the bacterial adhesion properties of femtosecond laser-nanostructured surfaces of four types of zirconium-based bulk metallic glasses are assessed. Laser-induced periodical surface structures and nanoparticle structures were fabricated by femtosecond laser irradiation under different energy intensities (0.23 and 2.3 J/mm2). Surface topography, roughness, wettability, and surface energy were investigated after femtosecond laser irradiation and the surface bacterial adhesion properties were explored using Escherichia coli and Staphylococcus aureus as respective representatives of Gram-negative and Gram-positive bacteria. 4′,6-Diamidino-2-phenylindole fluorescence staining was used to characterize and assess the bacterial surface coverage rate. The in vitro cytotoxicity of polished and laser-nanostructured surfaces was investigated using MC3T3-E cells. The obtained results demonstrate that femtosecond laser surface nanostructuring retained the amorphous structure of zirconium-based bulk metallic glasses and led to an obvious decrease in bacterial adhesion compared with polished surfaces. The inhibition of bacterial adhesion on laser-induced periodical surface structures was greater than on nanostructured surfaces after 24 h of bacterial incubation. In addition, femtosecond laser nanostructuring did not have an apparent effect on the cytotoxicity of zirconium-based bulk metallic glasses.

scholarly journals Super black eyespots of the Eyed elater

2019 ◽  
Author(s):  
Victoria L Wong ◽  
Paul E Marek
Keyword(s):  
Incident Light ◽  
Natural World ◽  
Surface Structures ◽  
Anatomical Structures ◽  
Scattering Of Light ◽  
Click Beetle ◽  
Absorption Of Light ◽  
Complete Absorption ◽  
Vertically Aligned ◽  
Scatter Light

Scattering of light by surface structures leading to near complete structural absorption creates an appearance of “super black.” Well known in the natural world from bird feathers and butterfly scales, super black has evolved independently from various anatomical structures. Due to an exceptional ability to harness and scatter light, these biological materials have garnered interest from optical industries. Here we describe the false eyespots of the Eyed elater click beetle, which attains near complete absorption of light by an array of vertically-aligned microtubules. These cone-shaped microtubules are modified hairs (setae) that are localized to eyespots on the dorsum of the beetle, and absorb 96.1% of incident light (at a 24.8° collection angle) in the spectrum between 300 – 700 nm.

A bioinspired approach to fabricate fluorescent nanotubes with strong water adhesion by soft template electropolymerization and post-grafting

2021 ◽  
Author(s):  
Ananya Sathanikan ◽  
Giacomo Ceccone ◽  
Jorge Bañuls-Ciscar ◽  
Miaobo Pan ◽  
Fadwa Kamal ◽  
...  
Keyword(s):  
Soft Template ◽  
Water Adhesion

A one-step electrodeposition of homogeneous and vertically aligned nanotubes with parahydrophobic properties (high water adhesion)

2016 ◽  
Vol 4 (9) ◽  
pp. 3197-3203 ◽  
Author(s):  
Thierry Darmanin ◽  
Frédéric Guittard
Keyword(s):  
High Water ◽  
One Step ◽  
Water Adhesion ◽  
Vertically Aligned

Nanotubes of various dimensions displaying parahydrophobic properties are obtained by a one-step electropolymerization of naphtho[2,3-b]thieno[3,4-e][1,4]dioxine (NaphDOT) without surfactants or hard templates.

Effects of Rugged Nanoprotrusions on the Surface Hydrophobicity and Water Adhesion of Anisotropic Micropatterns

Langmuir ◽  
2007 ◽  
Vol 23 (9) ◽  
pp. 4886-4891 ◽  
Author(s):  
Xuefeng Gao ◽  
Xi Yao ◽  
Lei Jiang
Keyword(s):  
Surface Hydrophobicity ◽  
Water Adhesion
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