scholarly journals Zirconia Nanotube Coatings - UV-Resistant Superhydrophobic Surfaces

2021 ◽  
Author(s):  
Swathi Naidu Vakamulla Raghu ◽  
Manuela S Killian ◽  
Khajidkhand Chuluunbandi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mechanical Stability ◽  
Single Step ◽  
Superhydrophobic Surfaces ◽  
Electrochemical Anodization ◽  
Oxide Surfaces ◽  
Metal Oxide Surfaces ◽  
Superhydrophobic Coatings ◽  
Assembled Monolayers ◽  
Nanostructured Oxide

Surface modifications influence material interactions such as wettability, imparting hydrophobicity or hydrophilicity. Mainstream research focused on enhancing product shelf-life, directs attention towards superhydrophobic surfaces (SHS). SHS offer several benefits for outdoor applications such as self-cleaning, anti-soiling, anti-mist etc. In this manuscript, we explore the possibility of combining structural and chemical modifications to metal substrates in order to create superhydrophobic metal oxide surfaces. ZrO2-nanotubes are evaluated with regard to their application as transparent UV-stable superhydrophobic coatings. Nanostructured oxide surfaces are created via single-step electrochemical anodization. The absence of HF acid-based pre-etching steps offer a safe and alternatively a green synthesis route. Anodized oxides are modified using octadecylphosphonic acid self-assembled monolayers, demonstrate superhydrophobicity and are evaluated for their mechanical stability under a jet of water, chemical stability under indirect sunlight irradiation in air/water and direct UV exposure. Zirconia nanotubular films were evaluated for optical transparency using light microscopy and surface wettability of the different zirconia-composites was compared to the model system-titania. Structural and compositional differences of the SAM layer upon time dependent decay were analyzed with X-ray photoelectron spectroscopy. <br>

scholarly journals Zirconia Nanotube Coatings - UV-Resistant Superhydrophobic Surfaces

2021 ◽  
Author(s):  
Swathi Naidu Vakamulla Raghu ◽  
Manuela S Killian ◽  
Khajidkhand Chuluunbandi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mechanical Stability ◽  
Single Step ◽  
Superhydrophobic Surfaces ◽  
Electrochemical Anodization ◽  
Oxide Surfaces ◽  
Metal Oxide Surfaces ◽  
Superhydrophobic Coatings ◽  
Assembled Monolayers ◽  
Nanostructured Oxide

Surface modifications influence material interactions such as wettability, imparting hydrophobicity or hydrophilicity. Mainstream research focused on enhancing product shelf-life, directs attention towards superhydrophobic surfaces (SHS). SHS offer several benefits for outdoor applications such as self-cleaning, anti-soiling, anti-mist etc. In this manuscript, we explore the possibility of combining structural and chemical modifications to metal substrates in order to create superhydrophobic metal oxide surfaces. ZrO2-nanotubes are evaluated with regard to their application as transparent UV-stable superhydrophobic coatings. Nanostructured oxide surfaces are created via single-step electrochemical anodization. The absence of HF acid-based pre-etching steps offer a safe and alternatively a green synthesis route. Anodized oxides are modified using octadecylphosphonic acid self-assembled monolayers, demonstrate superhydrophobicity and are evaluated for their mechanical stability under a jet of water, chemical stability under indirect sunlight irradiation in air/water and direct UV exposure. Zirconia nanotubular films were evaluated for optical transparency using light microscopy and surface wettability of the different zirconia-composites was compared to the model system-titania. Structural and compositional differences of the SAM layer upon time dependent decay were analyzed with X-ray photoelectron spectroscopy. <br>

scholarly journals Synthesis of Aminopropyltriethoxysilyl-Substituted Imines and Amides

Molbank ◽  
10.3390/m1251 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1251
Author(s):  
Surya R. Banks ◽  
J. Tanner Morningstar ◽  
Mark E. Welker
Keyword(s):  
Metal Oxide ◽  
Small Molecules ◽  
Self Assembled Monolayers ◽  
Oxide Surfaces ◽  
Metal Oxide Surfaces ◽  
Assembled Monolayers ◽  
One Step ◽  
Self Assembled

A series of small molecules containing aminopropyltriethoxysilyl-substituted imines and amides were synthesized so that they could potentially be incorporated into self-assembled monolayers (SAMs) on metal oxide surfaces. Simple one-step imine preparations and two-step amide preparations are reported here.

scholarly journals Flexible Ni/NiOx-Based Sensor for Human Breath Detection

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 47
Author(s):  
Le Duc-Anh Ho ◽  
Vu Binh Nam ◽  
Daeho Lee
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mechanical Stability ◽  
Gas Sensing ◽  
Single Layer ◽  
Fast Response ◽  
Single Step ◽  
Chemical Components ◽  
Human Breath ◽  
Flexible Polymer ◽  
Recovery Times

We developed a simple methodology to fabricate an Ni/NiOx-based flexible breath sensor by a single-step laser digital patterning process of solution-processed NiOx thin-film deposited using NiOx nanoparticle ink. Laser-induced reductive sintering phenomenon enables for the generation of three parts of Ni electrodes and two narrow NiOx-sensing channels in between, defined on a single layer on a thin flexible polymer substrate. The Ni/NiOx-based breath sensor efficiently detects human breath at a relatively low operating temperature (50 °C) with fast response/recovery times (1.4 s/1.7 s) and excellent repeatability. The mechanism of the gas-sensing ability enhancement of the sensor was investigated by X-ray photoelectron spectroscopy analysis. Furthermore, by decoupling of the temperature effect from the breathing gas, the response of the sensor due to the temperature alone and due to the chemical components in the breathing gas could be separately evaluated. Finally, bending and cyclic bending tests (10,000 cycles) demonstrated the superior mechanical stability of the flexible breath sensor.

scholarly journals N-Heterocyclic Carbenes Reduce and Functionalize Copper Oxide Surfaces in a Single Step

2020 ◽  
Author(s):  
Alex Veinot ◽  
abrar al-rashed ◽  
J. Daniel Padmos ◽  
Mina R. Narouz ◽  
Paul A. Lummis ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Complete Removal ◽  
Single Step ◽  
Heterocyclic Carbenes ◽  
Oxide Surfaces ◽  
Metallic Surfaces ◽  
Hydrogen Carbonate ◽  
Before And After ◽  
Carbonate Salts

Benzimidazolium hydrogen carbonate salts have been shown to act as N-heterocyclic carbene precursors which can remove oxide from copper oxide surfaces and functionalize the resulting metallic surfaces in a single step. Both the surfaces and the etching products are fully characterized by spectroscopic methods. Analysis of surfaces before and after NHC treatment by X-ray photoelectron spectroscopy demonstrates the complete removal of copper(II) oxide. Using <sup>13</sup>C-labelling, we determine that the products of this transformation include a cyclic urea, a ring-opened formamide and a bis-carbene copper(I) complex. These results illustrate the potential of NHCs to functionalize a much broader class of metals, including those prone to oxide treatment, greatly facilitating the preparation of NHC-based films on metals other than gold.

scholarly journals N-Heterocyclic Carbenes Reduce and Functionalize Copper Oxide Surfaces in a Single Step

2020 ◽  
Author(s):  
Alex Veinot ◽  
abrar al-rashed ◽  
J. Daniel Padmos ◽  
Mina R. Narouz ◽  
Paul A. Lummis ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Complete Removal ◽  
Single Step ◽  
Heterocyclic Carbenes ◽  
Oxide Surfaces ◽  
Metallic Surfaces ◽  
Hydrogen Carbonate ◽  
Before And After ◽  
Carbonate Salts

Benzimidazolium hydrogen carbonate salts have been shown to act as N-heterocyclic carbene precursors which can remove oxide from copper oxide surfaces and functionalize the resulting metallic surfaces in a single step. Both the surfaces and the etching products are fully characterized by spectroscopic methods. Analysis of surfaces before and after NHC treatment by X-ray photoelectron spectroscopy demonstrates the complete removal of copper(II) oxide. Using <sup>13</sup>C-labelling, we determine that the products of this transformation include a cyclic urea, a ring-opened formamide and a bis-carbene copper(I) complex. These results illustrate the potential of NHCs to functionalize a much broader class of metals, including those prone to oxide treatment, greatly facilitating the preparation of NHC-based films on metals other than gold.

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