Corrosion mechanism of pure aluminium in aqueous alkaline solution

2000 ◽  
Vol 4 (5) ◽  
pp. 267-272 ◽  
Author(s):  
Su-Il Pyun ◽  
Sung-Mo Moon
Keyword(s):  
Alkaline Solution ◽  
Corrosion Mechanism ◽  
Pure Aluminium ◽  
Aqueous Alkaline Solution

Enhanced Thermal Stability of Esterified Lignin in Different Solvent Mediums

2018 ◽  
Vol 9 (1) ◽  
pp. 39-49 ◽  
Author(s):  
Sharifah Nurul Ain Syed Hashim ◽  
Sarani Zakaria ◽  
Chin Hua Chia ◽  
Sharifah Nabihah Syed Jaafar
Keyword(s):  
Thermal Stability ◽  
Alkaline Solution ◽  
Room Temperature ◽  
Hydroxyl Groups ◽  
Aqueous Alkaline Solution ◽  
Alkali Lignin ◽  
Weight Percentage ◽  
H Nmr ◽  
Ft Ir ◽  
Thermal Stability Of

In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterification process induced the carboxylic peak to appear in both alkali lignin samples. The outcome is confirmed by conducting H-NMR analysis, which demonstrated ester and carboxylic acid peaks within the spectral analysis. Finally, the TGA results showed both EFB-EL and KC-EL that are exposed to aqueous alkaline actually possessed better thermal stability and higher activation energy (Ea) compared to the esterified samples in pyridine.

Acid-Base Equilibrium of 5-Methoxy-6-methyluracil in Solutions: Evaluation of Content of Anionic Forms in Aqueous Alkaline Solution

2018 ◽  
Vol 88 (6) ◽  
pp. 1076-1080 ◽  
Author(s):  
S. F. Petrova ◽  
T. R. Nugumanov ◽  
L. V. Spirikhin ◽  
Yu. I. Murinov ◽  
S. P. Ivanov
Keyword(s):  
Alkaline Solution ◽  
Aqueous Alkaline Solution ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium

Deposition Mechanism of Ni on Si(100) Surfaces in Aqueous Alkaline Solution

2004 ◽  
Vol 108 (28) ◽  
pp. 9900-9904 ◽  
Author(s):  
Daisuke Niwa ◽  
Takayuki Homma ◽  
Tetsuya Osaka
Keyword(s):  
Alkaline Solution ◽  
Aqueous Alkaline Solution ◽  
Deposition Mechanism
Sign in / Sign up

Export Citation Format

Share Document