Encapsulation of silver nanocomposites and effects of stabilizers.
Silver nanocomposites (AgCPs) have been synthesized by chemical reduction from silver nitrate and sodium borohydride in presence of two stabilizers. Starch and poly (vinyl) alcohol, PVA with its rich source of polyhydroxy groups has been exploited for the capping of AgCPs. The ageing of NaBH4 aqueous solution, molar ratios of the reactants, nature of the stabilizers, mixing order of NaBH4 as well as capping agents have great influence on the morphology of AgCPs. We used the iodometric titration to conform the encapsulation of AgCPs inside the helical structure of starch. The reversible nature of encapsulation has been studied by UV-vis spectroscopic technique. Well-dispersed with an approximate size of 10nm and aggregated with an approximate size of 24-52 nm AgCPs were observed in the absence and presence of stabilizers (starch and PVA), respectively. TEM images indicates that the reaction mixture containing different order of reactants and stabilizers (PVA+NaBH4+Ag(+), PVA+Ag(+)+NaBH4, starch+NaBH4+Ag(+) and starch+Ag(+)+NaBH4) have different morphology. Added electrolytes (NaCl, NaBr and NaI) do not detached the Ag(+) ions from the surface of AgNCs.
Nanoscience Research Laboratory, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India.
Ommer
O
Bashir
Nanoscience Research Laboratory, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India.
Shokit
S
Hussain
Nanoscience Research Laboratory, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India. Electronic address: drkhanchem@yahoo.co.in.
Zaheer
Z
Khan
Department of Chemistry, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Shaeel Ahmed
SA
Al-Thabaiti
D001894:Borohydrides / Q000737:chemistry*; D002214:Capsules; D053761:Nanocomposites / Q000737:chemistry*; D010084:Oxidation-Reduction; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry
D001894:Borohydrides; D002214:Capsules; D014867:Water; C025364:sodium borohydride; D011142:Polyvinyl Alcohol; D013213:Starch; D012835:Silver Nitrate
Encapsulation; Iodomerty; Silver nanocomposites; Starch