The Role of Ammonia in Synthesis of Silver Nanoparticles in Skim Natural Rubber Latex

Silver nanoparticles (AgNPs) were synthesized in skim natural rubber latex, the by-product from concentrated latex production. The role of ammonia was investigated by varying the concentration to be 0.217, 0.362, 0.377, 0.392, and 0.406 wt%. The emergence of AgNPs was detected by UV-visible spectrop...

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Bibliographic Details
Published in:Journal of nanoscience 2016-01, Vol.2016, p.1-6
Main Authors: Danwanichakul, Panu, Suwatthanarak, Thanawat, Suwanvisith, Chidchanok, Danwanichakul, Duangkamol
Format: Article
Language:English
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Summary:Silver nanoparticles (AgNPs) were synthesized in skim natural rubber latex, the by-product from concentrated latex production. The role of ammonia was investigated by varying the concentration to be 0.217, 0.362, 0.377, 0.392, and 0.406 wt%. The emergence of AgNPs was detected by UV-visible spectrophotometer and electrical conductivity meter. Upon increasing ammonia concentration, the ABS peak increased to a maximum and slightly shifted to a higher wavelength and then it decreased afterward and slightly shifted to a lower wavelength. The shift of the ABS peak was consistent with the conductivity result. The kinetic model was proposed to explain the competition between the reducing effect and size-controlling effect of ammonia. The reducing effect seemed to dominate in the low range of concentration while the size-controlling effect via the formation of A g N H 3 2 + complex ion was important in the higher range. The TEM figures evidently confirmed the effects.
ISSN:2356-749X
2314-6931
DOI:10.1155/2016/7258313