Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/152049
Title: Observation of the interactions of silver nanoparticles (AgNPs) mediated by acid in the aquatic matrices using in-situ liquid cell transmission electron microscopy
Authors: Fernando, Ishara
Tay, Yee Yan
Karunasekera, Hasith
Zhou, Yan
Keywords: Engineering::Environmental engineering
Issue Date: 2020
Source: Fernando, I., Tay, Y. Y., Karunasekera, H. & Zhou, Y. (2020). Observation of the interactions of silver nanoparticles (AgNPs) mediated by acid in the aquatic matrices using in-situ liquid cell transmission electron microscopy. Analytica Chimica Acta, 1104, 47-52. https://dx.doi.org/10.1016/j.aca.2019.12.072
Journal: Analytica Chimica Acta 
Abstract: The properties of the solution matrix play a prominent role in determining the interactions between the silver nanoparticles (AgNPs) when they are present in the aquatic environment. Here, using in situ liquid cell transmission electron microscopy (LCTEM), we show that the interaction of AgNPs is predominantly affected by the solution pH. Reducing the pH in the solution will accelerate the aggregation of AgNPs due to the alteration of the charge cloud around the NPs. Aggregates formed in this scenario were non spherical and irregular shaped and were stable under the electron beam irradiation. Individual AgNPs and smaller aggregates moved randomly and approached the larger aggregates before the aggregation process came to an end. We found that during the aggregation process, the mode of jump to contact and the pairwise approach of aggregation differed according to the composition of the solution. Observations made using the LCTEM were further explained using empirical formulae. Our observation on the pH induced interactions provides important insights on predicting the behavior of AgNPs released through many anthropogenic activities in the environment.
URI: https://hdl.handle.net/10356/152049
ISSN: 0003-2670
DOI: 10.1016/j.aca.2019.12.072
Schools: Interdisciplinary Graduate School (IGS) 
School of Materials Science and Engineering 
School of Electrical and Electronic Engineering 
School of Civil and Environmental Engineering 
Departments: Facility for Analysis, Characterization, Testing and Simulation
Research Centres: Nanyang Environment and Water Research Institute 
Advanced Environmental Biotechnology Centre (AEBC) 
Rights: © 2019 Elsevier B.V. All rights reserved. This paper was published in Analytica Chimica Acta and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
EEE Journal Articles
IGS Journal Articles
MSE Journal Articles
NEWRI Journal Articles

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