scholarly journals Biferrocenyl Schiff bases as efficient corrosion inhibitors for an aluminium alloy in HCl solution: a combined experimental and theoretical study

RSC Advances ◽  
2020 ◽  
Vol 10 (13) ◽  
pp. 7585-7599 ◽  
Author(s):  
Uzma Nazir ◽  
Zareen Akhter ◽  
Naveed Kausar Janjua ◽  
Muhammad Adeel Asghar ◽  
Sehrish Kanwal ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Theoretical Study ◽  
Electrochemical Impedance ◽  
Electron Microscopic ◽  
Loss Analysis ◽  
Tafel Polarization ◽  
Electron Microscopic Technique ◽  
Scanning Electron Microscopic ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The anticorrosion activity of biferrocenyl Schiff bases on AA2219-T6 in acidic medium were studied using Tafel polarization, electrochemical impedance spectroscopy, weight loss analysis, FT-IR spectroscopy and scanning electron microscopic technique.

Infrared spectroscopic characterization of phosphate binding at the goethite–water interface

2019 ◽  
Vol 21 (8) ◽  
pp. 4421-4434 ◽  
Author(s):  
Ashour A. Ahmed ◽  
Stella Gypser ◽  
Peter Leinweber ◽  
Dirk Freese ◽  
Oliver Kühn
Keyword(s):  
Theoretical Study ◽  
Spectroscopic Characterization ◽  
Water Interface ◽  
Phosphate Binding ◽  
Molecular Binding ◽  
Ft Ir ◽  
Periodic Dft Calculations ◽  
Binding Mechanisms ◽  
Ft Ir Spectroscopy

The molecular binding mechanisms for the adsorbed phosphate at the goethite–water interface have been explored via a joint experimental/theoretical study. This study involved performing sorption experiments, characterization by FT-IR spectroscopy, and performing periodic DFT calculations.

scholarly journals Inhibitive Effect by Acid Extract of Ficus Exasperata Leaves on the Sulphuric Acid Corrosion of Mild Steel

2009 ◽  
Vol 6 (s1) ◽  
pp. S189-S194 ◽  
Author(s):  
N. S. Patel ◽  
S. Jauhari ◽  
G. N. Mehta
Keyword(s):  
Weight Loss ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Electrochemical Impedance ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Microscopic Studies ◽  
Scanning Electron

Extract ofFicus exasperataleaves was investigated as corrosion inhibitor of mild steel in 1 N H2SO4using conventional weight loss, electrochemical polarizations, electrochemical impedance spectroscopy and scanning electron microscopic studies. The weight loss results showed that the extract ofFicus exasperatais excellent corrosion inhibitor. Electrochemical polarizations data revealed the mixed mode of inhibition. The results of electrochemical impedance spectroscopy shows that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. Scanning electron microscopic studies provided the confirmatory evidence of improved surface condition, due to the adsorption, for the corrosion protection.

Characterization on Aggregating Structure of Aloe Extract Crosslinked Cotton Fabric

2011 ◽  
Vol 311-313 ◽  
pp. 1132-1135 ◽  
Author(s):  
Yun Hui Xu ◽  
Li Chen
Keyword(s):  
Citric Acid ◽  
Cotton Fabric ◽  
Cotton Textile ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Scanning Electron Microscopic ◽  
Ft Ir ◽  
Textile Products

For exploiting the multifunctional ecological cotton textile products and developing the green modified technology for cotton fabrics, a novel cotton fabric with aloe extract crosslinking was prepared using citric acid as a crosslink agent under the pad-dry-cure procedure. Scanning electron microscopic photographs showed that the modification with aloe extract occurred on the surface of cotton fabric. FT-IR spectra of the modified fabric illuminated that aloe extract crosslinked with cotton fabric through the bridge linkage of citric acid after a series of reaction. The wide angle X-ray diffraction analysis indicated that the crystallinity of aloe extract modified cotton fabric slightly decreased. Furthermore, the changes in the aggregating structure and crystallinity were also reflected in the mechanical property studies of these modified fabrics. After treatment by aloe extract, the breaking strength and elongation of cotton fabric decreased. However, the moisture regain of the modified cotton fabric increased. The results obtained are useful in explaining structure-property correlations with respect to the aggregating structure and crystallinity, and suggest valuable information in planning applications for the aloe extract modified cotton textile products.

Noncovalently copper-porphyrin functionalized reduced graphene oxide for sensitive electrochemical detection of dopamine

2018 ◽  
Vol 22 (09n10) ◽  
pp. 853-862 ◽  
Author(s):  
Dong-Lan Huang ◽  
Jian Wang ◽  
Hui-Qing Yuan ◽  
Hui-Shi Guo ◽  
Xiao Ying ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Visible Spectroscopy ◽  
Glass Carbon Electrode ◽  
Copper Porphyrin ◽  
Reduced Graphene ◽  
Glass Carbon ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The nanocomposite of an electron-deficient flat tetrakis-(ethoxycarbonyl) porphyrin copper(II) (Cu-TECP) and reduced grapheme oxide (RGO) was prepared and used for electrochemical detection of dopamine (DA). The prepared nanocomposite was characterized by scanning electron microscopy, Raman spectroscopy, FT-IR spectroscopy, ultraviolet-visible spectroscopy and electrochemical impedance spectroscopy. Electrochemical studies of the modified glass carbon electrode (GCE) were carried out by the cyclic voltammetry and differential pulse voltammograms (DPV) methods. The RGO/Cu-TECP/GCE exhibited enhanced electrocatalytic activity towards the detection of dopamine (DA). The detection limit was 0.58 μM, while the linear range was from 2 to 200 μM ([Formula: see text] 0.997).

scholarly journals Synthesis and Structural Characteristics of Semi-Synthetic Biopolymer Blends Based on Polyvinyl Alcohol, Starch and Chitosan

2018 ◽  
Vol 14 (2) ◽  
pp. 5554-5563
Author(s):  
Amal Gad Elshahawy ◽  
S. I. Badr ◽  
A. A. Shadi
Keyword(s):  
Structural Characteristics ◽  
X Ray Diffraction ◽  
Optical Studies ◽  
Electron Microscopic ◽  
Polymeric Matrices ◽  
X Ray ◽  
Bright Spots ◽  
Scanning Electron Microscopic ◽  
Ft Ir ◽  
Uv Visible

Structural and optical studies in combination with surface morphology investigations were accomplished for blend sample (70/30)wt% PVA/Starch in addition to other samples of the same composition containing added pre-calculated chitosan contents via ordinary casting route. All synthesized samples were tested using various experimental techniques including Fourier transform infrared FT-IR, UV-visible spectroscopic measurements and scanning electron microscopic (SEM). Variations in FT-IR, UV/vis. band positions and intensities were used as an evidence for the interaction between constituent partner polymeric matrices. The X-ray diffraction (XRD) experimental data reveled that introduction of chitosan into the polymeric matrices results in a decreasing of percent crystallinity through material. SEM micrographs for samples containing chitosan different concentration revealed small granules and bright spots that attributed to starch. Adding up to 80% more chitosan caused the cryo-fractured surface to become rougher and more brittle.

scholarly journals Facile Synthesis and Characterization of Wollastonite Polyindole Composites to Study their Electrical Conductivity Behaviour

2019 ◽  
Vol 62 (2) ◽  
pp. 67-75
Author(s):  
Khalid Javed ◽  
Farah Kanwal ◽  
Saadat Anwar Siddiqi ◽  
Shahid Atiq ◽  
Waheed Mushtaq ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Dc Conductivity ◽  
Electron Microscopic ◽  
Morphological Studies ◽  
Electron Microscopic Technique ◽  
Scanning Electron Microscopic ◽  
Thermal Stability Of

In this work pure polyindole and its composites with wollastonite have been prepared by using anhydrous ferric chloride (FeCl3) as an oxidizing agent. Wollastonite (CaSiO3) was prepared by sol gel method using citric acid, calcium nitrate and tetraethylorthosilicate (TEOS) for the synthesis of composites. Particle size of the synthesized wollastonite was 58.8 nm. Effect of wollastonite weight percentages ranging from 1-25% of the polyindole in polyindole wollastonite (PIn/CaSiO3) composites was studied. Chemical structure was elucidated for polyindole/wollastonite (PIn/CaSiO3) composites and wollastonite (CaSiO3) was done through Fourier transform infra red spectroscopy (FTIR), which revealed successful fabrication of polyindole/wollastonite (PIn/CaSiO3) composites and wollastonite (CaSiO3) particles. Scanning electron microscopic technique was used for surface morphological studies. Thermal stability of the composites was examined through thermogravimetry. Four probe method was used to measure DC-conductivity of the samples. Composites showed DC conductivity in the range, 3.71´10-7 Siemens per centimeter.

scholarly journals Synthesis and characterization of Ni2C: An efficient electrocatalyst towards hydrogen evolution reaction

2021 ◽  
Author(s):  
Sathish Vilvanathan ◽  
Roshini Gunasekaran
Keyword(s):  
Cyclic Voltammetry ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tafel Polarization ◽  
Nickel Carbide ◽  
One Step ◽  
Ft Ir

Abstract Ni2C electrocatalyst were synthesized and characterized for the Hydrogen Evolution Reaction (HER) electrolyzer. One step hydrothermal technique is used to synthesize Ni2C sample. Platinum based electro catalyst materials are initial and best electro catalyst for Hydrogen Evolution Reaction (HER). Ni2C (Nickel Carbide electro catalyst) was examined by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD). Electrochemical characterization like cyclic voltammetry (CV), Tafel polarization and electrochemical impedance spectroscopy (EIS) studies is employed to explore the elctrocatalytic behavior of Ni2C material for HER. FTIR study confirms the presence of Ni2C electrocatalyst by the presence of metal peaks and various functional groups. The isomeric nature and purity of synthesized material were explored by powder X-ray diffraction studies. Cyclic voltammetry technique was performed in 0.5 M H2SO4 solution to attain the polarization curve of Ni2C electrocatalyst for HER.

Experimental and theoretical study of the photochemical and thermal decomposition of maleic and dichloromaleic anhydrides

2002 ◽  
Vol 80 (5) ◽  
pp. 455-461 ◽  
Author(s):  
A Ionescu ◽  
N Piétri ◽  
M Hillebrand ◽  
M Monnier ◽  
J P Aycard
Keyword(s):  
Thermal Decomposition ◽  
Ir Spectroscopy ◽  
Photochemical Reaction ◽  
Theoretical Study ◽  
Thermal Reaction ◽  
Mo Calculations ◽  
Reaction Conditions ◽  
Decomposition Processes ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The photochemical and thermal behavior of maleic anhydride 1a and dichloromaleic anhydride 1b, in cryogenic matrix were investigated by means of FT-IR spectroscopy. The ketenylcarbenes represent the key intermediate in the decomposition processes of the anhydrides, even if they were not observed experimentally. The yields of the different products depend on the thermal or photochemical reaction conditions. The main photochemical products obtained from 1a were cyclopropenone and acetylene, whereas the major products from 1b were dichlorocyclopropenone and dichloroacetylene, along with small quantities of dichloropropadienone. The thermal reaction leads to dichloro propa dienone, CO, and CO2. MO calculations performed at the HF/6-31G*//HF/6-31G* level support the experimental mechanisms.Key words: photolysis, thermolysis, ab initio calculations, cryogenic matrix, ketenylcarbenes.

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