Electrochemical Behavior of Copper in Tetramethyl Ammonium Hydroxide Based Solutions

1999 ◽  
Vol 566 ◽  
Author(s):  
W. H. Huang ◽  
S. Raghavan ◽  
Y. Fang ◽  
L. Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Polyvinyl Alcohol ◽  
Electrochemical Behavior ◽  
Ammonium Hydroxide ◽  
Experimental Results ◽  
Alkaline Solutions ◽  
Tetramethyl Ammonium ◽  
Ph Values ◽  
Tetramethyl Ammonium Hydroxide

An investigation was undertaken to characterize the electrochemical behavior of copper in tetramethyl ammonium hydroxide (TMAH) based solutions. The effect of hydrogen peroxide and abrasion with a polyvinyl alcohol (PVA) brush on the corrosion of copper in alkaline solutions were characterized. Galvanic interactions between copper and tantalum in TMAH as well as in ammonium hydroxide (NH4OH) solutions were investigated. The experimental results have shown that the corrosion of copper in TMAH is lower than that in NH4OH, especially at pH values higher than 10. Even in the presence of hydrogen peroxide, TMAH corrodes copper at a lower rate than NH4OH.

scholarly journals Effect of alkaline solutions on the tensile properties of glass-polyester pipes

2011 ◽  
pp. 185-195 ◽  
Author(s):  
Slavisa Putic ◽  
Marina Stamenovic ◽  
Jelena Petrovic ◽  
Marko Rakin ◽  
Bojan Medjo
Keyword(s):  
Tensile Properties ◽  
Construction Materials ◽  
Ammonium Hydroxide ◽  
Longitudinal Direction ◽  
Testing Procedure ◽  
Circumferential Direction ◽  
Process Equipment ◽  
Alkaline Solutions ◽  
Ph Values ◽  
Definite Structure

Construction materials, traditionally used in process equipment, are today successfully replaced by composite materials. Hence, many pipes are made of these materials. The subject of this study was the influence of liquids on the state of stresses and tensile strengths in the longitudinal and circumferential direction of glass-polyester pipes of a definite structure and known fabrication process. These analyses are of great importance for the use of glass-polyester pipes in the chemical industry. The tensile properties (the ultimate tensile strength and the modulus of elasticity) were tested and determined for specimens cut out of the pipes; flat specimens for the tensile properties in the longitudinal direction and ring specimens for the tensile properties in the circumferential direction. First, the tension test was performed on virgin samples (without the influence of any liquid), to obtain knowledge about the original tensile properties of the material composite studied. Subsequently, the specimens were soaked in alkaline solutions: sodium hydroxide (strong alkali) and ammonium hydroxide (weak alkali). These solutions were selected because of their considerable difference in pH values. The specimens and rings were left for 3, 10, 30 and 60 days in each liquid at room temperature. Then, the samples were tested on tension by the standard testing procedure. A comparison of the obtained results was made based on the pH values of the aggressive media in which the examined material had been soaked, as well as based on the original tensile properties and the number of days of treatment. Micromechanical analyses of sample breakage helped in the elucidation of the influence of the liquids on the structure of the composite pipe and enabled models and mechanisms that produced the change of strength to be proposed.

scholarly journals Doehlert design in the optimization of ultrasound assisted dissolution of fish fillet samples with tetramethyl ammonium hydroxide for metals determination using FAAS

2019 ◽  
Vol 273 ◽  
pp. 71-76 ◽  
Author(s):  
Daniélen dos Santos Silva ◽  
Carine Souza dos Santos ◽  
Luzia Aparecida Pando ◽  
Mário Sérgio Rocha Gomes ◽  
Cleber Galvão Novaes ◽  
...  
Keyword(s):  
Ammonium Hydroxide ◽  
Doehlert Design ◽  
Fish Fillet ◽  
Tetramethyl Ammonium ◽  
Tetramethyl Ammonium Hydroxide ◽  
Ultrasound Assisted

Separation and Recovery of Tetramethyl Ammonium Hydroxide with Mesoporous Silica Having a Hexagonal Structure (MCM-41)

2012 ◽  
Vol 30 (7) ◽  
pp. 724-734 ◽  
Author(s):  
Syouhei Nishihama ◽  
Miuki Murakami ◽  
Naoko Y. Igarashi ◽  
Katsutoshi Yamamoto ◽  
Kazuharu Yoshizuka
Keyword(s):  
Mesoporous Silica ◽  
Ammonium Hydroxide ◽  
Hexagonal Structure ◽  
Tetramethyl Ammonium ◽  
Tetramethyl Ammonium Hydroxide ◽  
Mcm 41

Experimental investigations of anisotropic etching of Si in tetramethyl ammonium hydroxide

1996 ◽  
Vol 74 (S1) ◽  
pp. 79-84 ◽  
Author(s):  
S. Naseh ◽  
L. M. Landsberger ◽  
M. Kahrizi ◽  
M. Paranjape
Keyword(s):  
Microelectromechanical Systems ◽  
Ammonium Hydroxide ◽  
Anisotropic Etching ◽  
Experimental Investigations ◽  
Rate Variation ◽  
Sensors And Actuators ◽  
Tetramethyl Ammonium ◽  
Tetramethyl Ammonium Hydroxide ◽  
Subtle Effect ◽  
Experimental Findings

Anisotropic etching of silicon in tetramethyl ammonium hydroxide (TMAH) is receiving attention as a relatively nontoxic alternative anisotropic etchant for silicon (Si), for the fabrication of microelectromechanical systems, sensors, and actuators. This work presents experimental investigations on several aspects of anisotropic etching of Si in TMAH. The effects of temperature and concentration on etch rates of {100} and {110} wafers are characterized. Several previously unreported experimental findings aimed at better understanding the atomic level mechanisms are presented: underetch-rate variation with mask-edge deviation, an investigation of stirring, and a subtle effect of applied bending stress.

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