what happen, if red flower petal placed in organic solvent like ethanol for about 30 minutes?
Answers
Explanation:
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Answer:
The synthesis of ZnO nanoparticles was made in various methods to study the effects on conditions such as precursors, temperature, time, and concentration on the morphology and properties of nanoparticles. The solvents have not been investigated to explore their effects in the morphologies and optical properties. In the work various solvents with varying degree of polarities were used. One of the general morphologies obtained from aqueous media is star-shaped nanoparticles, and different morphologies were obtained in solvents acetone, water, and ethanol due to the solvent interactions with the precursor, zinc nitrate salt in the presence of hexadecylamine to stabilize the particles. Microwave technique was used to ensure that the precursor is soluble in all solvents and hexadecylamine also was dispersed to allow both kinetic and thermodynamic control in the growth of nanoparticles. The interaction between solvents, hexadecylamine, and the precursor becomes critical in influencing the growth of particles. The addition of a base sodium hydroxide is generally known to generate an intermediate hydroxide
Zn(OH)42− upon reaction with the zinc salt (1).The conversion of the hydroxides into ZnO (2) is promoted by excess of sodium hydroxide in the presence of solvent medium either water, ethanol, or acetone. Water has the least solubility towards HDA whereas in acetone and ethanol solubility is increased and allowing more interaction between the particles and the capping molecule:
Zn2++4OH−⟶Zn(OH)
Zn(OH)42−⟶ZnO(2