A metal acetate solution in methanol was added dropwise
to the ligand in a 1 : 2 molar ratio in methanol.
Then, the pH of the solution was adjusted to 6.0 by adding the NaOH solution (1 M) dropwise
with constant stirring.
The aim of this work is to investigate chemical composition, crystalline structure, and barrier properties of inorganic films on the carbon steel/polyaniline interface formed with PANI prepared by two different procedures: dropwise
mixing of reagents (slow polymerization) and simultaneous addition of an oxidant to the monomer solution (fast polymerization).
A solution of hydrochloric acid in isopropanol (1:1 v/v) was added dropwise
to crystallize the crude product.
About 37.54 mL of absolute ethanol was added dropwise
to 12.46 mL of ice cold titanium tetrachloride solution in conical flask with vigorous stirring to form titanium ethoxide.
A more efficient condensation process is dropwise
condensation on hydrophobic (water-repellent) surfaces, where the vapor is condensed into individual droplets which can be easily shed away by gravity.
Preparation of benzyl carbazate: benzyl chloroformate (1 eq) was added dropwise
to the mixture of hydrazine hydrate (11 eq) and diethyl ether at 0[degrees]C.
After the color of solution changed from yellow to red, a solution of 0.432 g1,4-dibromo butane (.5mmol) in 20 cm3 ethanol was added dropwise
and was refluxed for 48 haccording to eq.
DBTDL was added dropwise
(4-5 drops) as a catalyst.
Under vigorous stirring at room temperature, 40 mL of deionized water was then added dropwise
to the solution over 2h.
A solution of sodium salt of o-tolyldithiocarbonate (1.00 g, 4.82 mmol) in 20 mL distilled water was added dropwise
with constant stirring at room temperature.
Then, the solution of NaOH (0.5 M) in deionized water was added dropwise
to adjust the pH to 7.