Ultrasonically assisted macrocyclic ring compound coatings for corrosion protection of copper in 3.5% NaCl solution

CORROSION ◽  
10.5006/3703 ◽  
2021 ◽  
Author(s):  
V. Ulagammal ◽  
Vitalis Chukwuike ◽  
Saranyan Vijayaraghavan ◽  
R C Barik
Keyword(s):  
Corrosion Protection ◽  
Self Assembly ◽  
Corrosion Inhibitors ◽  
Imaging Techniques ◽  
Hydrophobic Property ◽  
Macrocyclic Ring ◽  
Ring Compounds ◽  
Assembly Method ◽  
Coating Morphology ◽  
Compound Coatings

ABSTRACT: Macrocyclic ring compounds are potential corrosion inhibitors due to their high planarity, rigidity, and presence of many heteroatoms such as nitrogen, oxygen, phosphorus, and sulfur. However, their application as corrosion inhibitors has been faced with a challenge of insolubility in most organic and aqueous solvents. To overcome this challenge and to harness the untapped hydrophobic property of these compounds, this research, via ultrasonication method dispersed a macrocyclic ring compound known as free-based Phthalocyanine (Pc) to fabricate a corrosion-resistant coating on the Cu surface. The Cu samples were coated through a 24 h immersion by self-assembly method in different systems of sonicated and non-sonicated solutions of the compound in dimethyl sulfoxide (DMSO). The effect of sonication and immersion duration on the coating morphology, compactness, and consequent corrosion inhibition was analyzed. Electrochemical and surface imaging techniques revealed higher corrosion protection in 3.5% NaCl for the Pc coated Cu samples after sonication compared to the non-sonicated systems.

scholarly journals Preparation of hydrophobic fabrics and effect of fluorine monomers on surface properties

2019 ◽  
Vol 14 ◽  
pp. 155892501988961
Author(s):  
Liping Liang ◽  
Manuel J Lis Arias ◽  
Zixuan Lou ◽  
Qiaole Mao ◽  
Chang Ye ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Cotton Fabric ◽  
Self Assembly ◽  
Chemical Structure ◽  
Research Work ◽  
Polymerization Reaction ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Assembly Method

Preparation of hydrophobic cotton fabric based on the self-assembly method was proposed. The cotton fabric was modified with 3-(methacryloyloxy)propyltrimethoxysilane and grafted with trifluoroethyl methacrylate and dodecafluoroheptyl methacrylate through free radical polymerization reaction. The objective of this research work was to investigate the effect of fluorine monomer with different chemical structure deposited on cotton fabric on the hydrophobic property. The chemical structure, surface topography, and surface wettability of the fabrics were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and water contact angle experiments, respectively. The results showed that the as-prepared fabrics exhibited water contact angle of above 140°. It was noticed that the fluorocarbon chain length of a modifier and its chemical structure could strongly affect the hydrophobic property of the modified fabrics, and the increase in fluorine atoms caused an increase in the water contact angle values.

Different Adsorption States between Thiophene and α-Bithiophene Thin Films Prepared by Self-Assembly Method

2003 ◽  
Vol 42 (Part 2, No. 7B) ◽  
pp. L852-L855 ◽  
Author(s):  
Eisuke Ito ◽  
Jaegeun Noh ◽  
Masahiko Hara
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Assembly Method

The synthesis of calcium carbonate microparticles with multiple morphologies through self-assembly method

2015 ◽  
Vol 284 ◽  
pp. 253-256 ◽  
Author(s):  
Guang Yuan ◽  
Xiaofeng Chen ◽  
Xian Li ◽  
Qiming Liang ◽  
Guohou Miao ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Self Assembly ◽  
Assembly Method

Preparation and Characterization of Polyaniline Nanotubes Doped with Different Acid

2013 ◽  
Vol 401-403 ◽  
pp. 663-666
Author(s):  
Xue Lian Bai ◽  
Jian Ting Mei ◽  
Zhong Guo Mu ◽  
Yun Bai
Keyword(s):  
Acetic Acid ◽  
Self Assembly ◽  
Ammonium Persulfate ◽  
Tetraacetic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Property ◽  
Assembly Method ◽  
Polyaniline Nanotubes

Polyaniline (PANI) nanotubes were synthesized separately using amino acetic acid (AA), ethylenediamine tetraacetic acid (EDTA), oxalic acid (OA) as dopant and ammonium persulfate (APS) as oxidant by a self-assembly method. SEM, TEM,FTIR and X-ray diffraction (XRD) and applying the 4 probes method characterized the morphology, structure and property of the product. It was found that nanotubes morphology were synthesized when the [Aci/[A ratio is 1:2.The room template conductivity of the products were studied.

scholarly journals A Structurally Variable Hinged Tetrahedron Framework from DNA Origami

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
David M. Smith ◽  
Verena Schüller ◽  
Carsten Forthmann ◽  
Robert Schreiber ◽  
Philip Tinnefeld ◽  
...  
Keyword(s):  
Self Assembly ◽  
Gel Electrophoresis ◽  
Imaging Techniques ◽  
Building Blocks ◽  
Dna Origami ◽  
Microscopy Technique ◽  
Wire Frame ◽  
Wide Range ◽  
Potential Applications ◽  
Linker Molecules

Nanometer-sized polyhedral wire-frame objects hold a wide range of potential applications both as structural scaffolds as well as a basis for synthetic nanocontainers. The utilization of DNA as basic building blocks for such structures allows the exploitation of bottom-up self-assembly in order to achieve molecular programmability through the pairing of complementary bases. In this work, we report on a hollow but rigid tetrahedron framework of 75 nm strut length constructed with the DNA origami method. Flexible hinges at each of their four joints provide a means for structural variability of the object. Through the opening of gaps along the struts, four variants can be created as confirmed by both gel electrophoresis and direct imaging techniques. The intrinsic site addressability provided by this technique allows the unique targeted attachment of dye and/or linker molecules at any point on the structure's surface, which we prove through the superresolution fluorescence microscopy technique DNA PAINT.

Chemically Responsive Polymer Inverse-Opal Photonic Crystal Films Created by a Self-Assembly Method

2016 ◽  
Vol 120 (22) ◽  
pp. 11938-11946 ◽  
Author(s):  
Huilin Zhao ◽  
Jianping Gao ◽  
Zeng Pan ◽  
Guanbo Huang ◽  
Xiaoyang Xu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Self Assembly ◽  
Inverse Opal ◽  
Assembly Method ◽  
Responsive Polymer ◽  
Crystal Films

Hydrogen-Bonding Layer Protecting Polyelectrolyte Capsules and Its Mechanical Property Study with Atomic Force Microscope

2008 ◽  
Vol 8 (6) ◽  
pp. 2996-3002 ◽  
Author(s):  
Liqin Ge ◽  
Xing Wang ◽  
Long Ba ◽  
Zhongze Gu
Keyword(s):  
Hydrogen Bonding ◽  
Atomic Force Microscope ◽  
Elastic Deformation ◽  
Self Assembly ◽  
Laser Scanning ◽  
Confocal Laser ◽  
Bonding Layer ◽  
Layer By Layer ◽  
Assembly Method ◽  
Atomic Force

The hydrogen-bonding multilayered polyelectrolyte capsules with sizes around 6 μm were fabricated by layer-by-layer self-assembly method. The morphology of the obtained capsules was observed with Scanning Electron Microscope (SEM), Confocal Laser Scanning Microscope (CLSM) and Atomic Force Microscope (AFM), respectively. The elastic properties of the capsules were studied with AFM. The capsule was pressed by cantilever with different lengths, a glass bead glued at the end of the cantilever. The force curves were measured on the capsule in air. The Young's modulus of the capsule was obtained (E = 170 MPa for the loading). Results show that this model can predict the elastic deformation of the microcapsule. The accuracy of the elastic deformation of polymer capsule can be ensured using a cantilever of mediate stiffness. Our results show that the existence of the hydrogen-bonding layer makes the multilayered polyelectrolyte harder in comparison with the pure multilayered polyelectrolyte capsules.

An automated setup for production of nanodimensional coatings by the polyelectrolyte self-assembly method

2006 ◽  
Vol 49 (6) ◽  
pp. 849-854 ◽  
Author(s):  
S. A. Portnov ◽  
A. M. Yashchenok ◽  
A. S. Gubskii ◽  
D. A. Gorin ◽  
A. A. Neveshkin ◽  
...  
Keyword(s):  
Self Assembly ◽  
Assembly Method

Regulation of melanoma cell growth by a miR-21 loaded targeted delivery system based on microparticles and nanoparticles targeting phosphatase and tensin homolog (PTEN)

2021 ◽  
Vol 11 (11) ◽  
pp. 1766-1773
Author(s):  
Lei Jin ◽  
Tong Yang
Keyword(s):  
Delivery System ◽  
Self Assembly ◽  
Targeted Delivery ◽  
Melanoma Cells ◽  
Phosphatase And Tensin Homolog ◽  
Tensin Homolog ◽  
Assembly Method ◽  
New Strategy ◽  
Low Levels ◽  
Phosphatase And Tensin Homologue

The modulatory effect of miR-21 on the proliferation of melanoma cells through stimulation of PTEN (Phosphatase and tensin homologue deleted on chromosome 10) expression was investigated in the current study. PTEN, as a tumor suppressor, is expressed in low levels in melanoma tissues and cell lines. Nevertheless, miR-21 can stimulate cancer development and suppress cell apoptosis. Overexpression of PTEN substantially impaired the proliferation of miR-21-treated melanoma cells. In addition, miR-21 and PTEN were observed to exhibit a combinatorial effect, whereas miR-21 could negatively regulate the expression of PTEN. In conclusion, these findings demonstrate that miR-21 affects melanoma development by targeting PTEN, establishing a new strategy for treating malignant melanoma. Furthermore, in this study, microparticles and nanoparticles were employed as carriers to construct, through the self-assembly method, nanocapsules carrying miR-21 in order to develop an efficient nanocapsule delivery system of miR-21 against melanoma cells.

Enhanced Entrapment and Improved in Vitro Controlled Release of N-Acetyl Cysteine in Hybrid PLGA/Lecithin Nanoparticles Prepared Using a Nanoprecipitation/Self-Assembly Method

2017 ◽  
Vol 118 (12) ◽  
pp. 4203-4209 ◽  
Author(s):  
Parvin Ahmaditabar ◽  
Amir A. Momtazi-Borojeni ◽  
Ali H. Rezayan ◽  
Mahboobeh Mahmoodi ◽  
Amirhossein Sahebkar ◽  
...  
Keyword(s):  
Controlled Release ◽  
Self Assembly ◽  
Assembly Method ◽  
Acetyl Cysteine
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