Manal El-Sheikh

6 Questions 20 Answers 0 Followers

Questions related from Manal El-Sheikh

Why related UV-Vis spectra of Ag, Cu, Fe, and Cu/Fe NPs does not appear?

Recently, I prepared Ag, Cu, Fe, and Cu/Fe NPs using plant extract for reduction and a water-soluble film forming polymer for capping. Although I noticed the change in color of the salt during...

14 March 2023 7,169 0 View

What is the best method for durable herbal finishing onto cotton fabrics?

What is the best method to fix the extract of herbs onto cotton fabrics to impart them durable antibacterial properties, color and aroma? It is known that fixation at high temperature for such...

19 May 2020 4,207 1 View

Are polyphenols, naturally present in plant extract, electrically conductive?

Extracts of fruits, herbs, vegetables, cereals, and other plant materials are rich in polyphenols. Polyphenols are rich in conjugated benzene rings with high electron density. Can the...

18 May 2016 1,882 9 View

Why are silver salts easily converted to AgNPs while for other metal salts they are converted to the corresponding metal oxide nanoparticles?

In presence of sodium hydroxide, reducing and stabilizing agents (eg. modified starch, cellulose or chitosan), the salts of copper, iron or aluminum are converted to the corresponding copper, iron...

01 May 2014 6,109 10 View

Why does the deep brown color of the silver nanoparticles plasmon is turned black upon drying?

I was able to prepare high concentrated silver nanoparticles. I also succeeded to precipitate it easily using ethanol and filter it easily using normal filtration tools. Upon drying, the deep...

26 March 2014 4,728 25 View

How can I dry metal nanoparticles without converting part of them to the corresponding oxide? Will drying under a vacuum help?

After precipitating metal nanoparticles from their colloidal solution and drying them in an oven or in open air, part of these nanoparticles are converted to the corresponding oxide. The XRD shows...

19 January 2013 8,123 10 View