Candle Soot as a Template for a Transparent Robust Superamphiphobic Coating

Science ◽  
2011 ◽  
Vol 335 (6064) ◽  
pp. 67-70 ◽  
Author(s):  
Xu Deng ◽  
Lena Mammen ◽  
Hans-Jürgen Butt ◽  
Doris Vollmer
Keyword(s):  
Contact Angles ◽  
Silica Shell ◽  
Low Energy ◽  
Organic Liquids ◽  
Essential Step ◽  
Candle Soot ◽  
Superhydrophobic Coatings ◽  
Black Coating ◽  
Properties Of Materials ◽  
Energy Surfaces

Coating is an essential step in adjusting the surface properties of materials. Superhydrophobic coatings with contact angles greater than 150° and roll-off angles below 10° for water have been developed, based on low-energy surfaces and roughness on the nano- and micrometer scales. However, these surfaces are still wetted by organic liquids such as surfactant-based solutions, alcohols, or alkanes. Coatings that are simultaneously superhydrophobic and superoleophobic are rare. We designed an easily fabricated, transparent, and oil-rebounding superamphiphobic coating. A porous deposit of candle soot was coated with a 25-nanometer-thick silica shell. The black coating became transparent after calcination at 600°C. After silanization, the coating was superamphiphobic and remained so even after its top layer was damaged by sand impingement.

Visualizing {110} Surface Structure of Equilibrium-form ZIF-8 Crystals by Low-dose Cs-corrected TEM

Nanoscale ◽  
2021 ◽  
Author(s):  
Xiaocang Han ◽  
Wenqian Chen ◽  
Rui Su ◽  
Yuan Tian ◽  
Pan Liu ◽  
...  
Keyword(s):  
Surface Structure ◽  
Low Dose ◽  
Low Energy ◽  
Zeolitic Imidazolate Frameworks ◽  
Equilibrium Form ◽  
Energy Surfaces

The properties of Zeolitic imidazolate frameworks (ZIFs) crystals highly depend on the structures of the low-energy surfaces, such as {110} of ZIF-8. However, the atomic/molecular configurations of the ZIF-8 {110}...

scholarly journals Superhydrophobic photothermal icephobic surfaces based on candle soot

2020 ◽  
Vol 117 (21) ◽  
pp. 11240-11246 ◽  
Author(s):  
Shuwang Wu ◽  
Yingjie Du ◽  
Yousif Alsaid ◽  
Dong Wu ◽  
Mutian Hua ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
High Energy ◽  
Silica Shell ◽  
Oxygen Plasma Treatment ◽  
Human Society ◽  
Environmental Friendliness ◽  
Candle Soot ◽  
Low Surface Energy ◽  
Ice Accumulation

Ice accumulation causes various problems in our daily life for human society. The daunting challenges in ice prevention and removal call for novel efficient antiicing strategies. Recently, photothermal materials have gained attention for creating icephobic surfaces owing to their merits of energy conservation and environmental friendliness. However, it is always challenging to get an ideal photothermal material which is cheap, easily fabricating, and highly photothermally efficient. Here, we demonstrate a low-cost, high-efficiency superhydrophobic photothermal surface, uniquely based on inexpensive commonly seen candle soot. It consists of three components: candle soot, silica shell, and polydimethylsiloxane (PDMS) brushes. The candle soot provides hierarchical nano/microstructures and photothermal ability, the silica shell strengthens the hierarchical candle soot, and the grafted low-surface-energy PDMS brushes endow the surface with superhydrophobicity. Upon illumination under 1 sun, the surface temperature can increase by 53 °C, so that no ice can form at an environmental temperature as low as −50 °C and it can also rapidly melt the accumulated frost and ice in 300 s. The superhydrophobicity enables the melted water to slide away immediately, leaving a clean and dry surface. The surface can also self-clean, which further enhances its effectiveness by removing dust and other contaminants which absorb and scatter sunlight. In addition, after oxygen plasma treatment, the surface can restore superhydrophobicity with sunlight illumination. The presented icephobic surface shows great potential and broad impacts owing to its inexpensive component materials, simplicity, ecofriendliness, and high energy efficiency.

Two-level stochastic search of low-energy conformers for molecular spectroscopy: implementation and validation of MM and QM models

2019 ◽  
Vol 21 (36) ◽  
pp. 19921-19934 ◽  
Author(s):  
Balasubramanian Chandramouli ◽  
Sara Del Galdo ◽  
Marco Fusè ◽  
Vincenzo Barone ◽  
Giordano Mancini
Keyword(s):  
Potential Energy Surfaces ◽  
Molecular Spectroscopy ◽  
Stochastic Search ◽  
Low Energy ◽  
Stationary Points ◽  
Flexible Systems ◽  
Molecular Potential ◽  
Internal Motions ◽  
Molecular Potential Energy ◽  
Energy Surfaces

The search for stationary points in the molecular potential energy surfaces (PES) is a problem of increasing relevance in molecular sciences especially for large, flexible systems featuring several large-amplitude internal motions.

scholarly journals Polystyrene-Core, Silica-Shell Scintillant Nanoparticles for Low-Energy Radionuclide Quantification in Aqueous Media

2018 ◽  
Vol 10 (5) ◽  
pp. 4953-4960 ◽  
Author(s):  
Colleen M. Janczak ◽  
Isen A. C. Calderon ◽  
Zeinab Mokhtari ◽  
Craig A. Aspinwall
Keyword(s):  
Aqueous Media ◽  
Silica Shell ◽  
Low Energy

Wetting of low-energy surfaces

2007 ◽  
Vol 134-135 ◽  
pp. 15-23 ◽  
Author(s):  
N.V. Churaev ◽  
V.D. Sobolev
Keyword(s):  
Low Energy ◽  
Energy Surfaces

Combinatorial Mapping of Polymer Film Wettability On Gradient Energy Surfaces

2001 ◽  
Vol 700 ◽  
Author(s):  
Karen Ashley ◽  
A. Sehgal ◽  
Eric J. Amis ◽  
D. Raghavan ◽  
A. Karim
Keyword(s):  
Surface Energy ◽  
Film Thickness ◽  
Substrate Surface ◽  
Contact Angles ◽  
Number Density ◽  
Surface Functionality ◽  
Chemically Modified ◽  
Piranha Solution ◽  
Gradient Energy ◽  
Energy Surfaces

AbstractCombinatorial methods were used for studying dewetting of thin hydrophobic polystyrene (PS) and hydrophilic poly(DL-lactic acid) (PDLA) films on chemically modified gradient energy surfaces. Substrate libraries were prepared by immersing passivated Si (Si-H surface functionality) in Piranha solution (H2SO4/H2O2/H2O) at acontrolled rate, yielding a systematic variation of solvent contact angles across the surface. Additionally, chlorosilane-treated Si surfaces were exposed to UV radiation in a gradient fashion under ozone atmosphere such that a range from hydrophobic to hydrophilic conditions was obtained across the surface (≈ 3 cm). Solvent droplet contact angles of water and diiodo methane were used to quantify the spatial variation of surface energy along one axis across the surface. Libraries of thin films of PS or PDLA coatings on gradient energy surfaces orthogonal to gradients in film thickness were screened for dewetting behavior using automated optical microscopy. Contrasting trends in the wettability of PS and PDLA were visibly apparent as a function of surface energy of the substrate. The number density of polygons of the dewet PS films was found to obey a power law relationship with both film thickness and substrate surface hydrophilicity.

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