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DTSTAMP:20260521T171726Z
SUMMARY:Multimodal characterisation of engineered nanomaterials in the envi
 ronment
DESCRIPTION:Abstract: \nFollowing the huge growth in nanotechnology-relate
 d industries\, significant concerns have arisen about their impact on both
  human health and the environment. As commercial exploitation of engineere
 d nanomaterials (ENMs) continues to expand\, it is increasingly urgent to 
 understand\, reduce and\, where possible\, to eradicate\, potential negati
 ve environmental impacts and ultimately control their safety to the enviro
 nment.\nThere are several pathways for ENMs to enter the environment depen
 ding on their application\, e.g. ENMs released from paints or fabrics duri
 ng the washing process are predicted to end up in landfill\, soil\, and su
 rface waters\, whereas for sunscreens\, coatings\, and cleaning agents\, t
 he major release of ENMs to the environment will be via sewage treatment p
 lants. Zinc oxide (ZnO) has attracted a vast quantity of research owing to
  its wide range of optoelectronic and electrical properties. ZnO NPs are w
 idely utilised in cosmetics\, paints\, personal hygiene products\, sunscre
 ens and moisturizers\, and also used as antibacterial agents in ointments\
 , lotions and surface coatings to prevent microorganism growth\nIn this wo
 rk\, we aim to quantify the lifetime of ENMs\, and to characterise their p
 hysicochemical characteristics as they reach the environment through sewag
 e and wastewater treatment. We hypothesise that the ZnO ENMs nanomaterials
  will transform in these media and these subsequent physico-chemical alter
 ations will change the bioreactivity of the nanomaterials to biota and bac
 teria. In the aquatic environment for example\, ionic zinc may partition a
 nd sorb to sediments or suspended solids in surface waters\, and may sorb 
 on to clay minerals\, and organic material.\nZnO ENMs with highly controll
 ed morphologies were synthesised following a procedure described by Xie et
  al. [1] and Wang et al. [2]. Physicochemical properties (i.e. shape\, siz
 e distribution\, agglomeration state\, crystal structure bulk and surface 
 chemistry) and concentrations of the selected ENMs after their incubation 
 in a range of synthetic and environmental waters are being characterised u
 sing a range of both conventional bulk and spatially resolved techniques (
 i.e. high resolution EM\, XRD\, DLS\, ICP-OES\, etc).  Finally\, I will p
 resent data using new in situ synchrotron techniques to track dissolution 
 and changes in the aggregation state as well as to evaluate the Zn speciat
 ion in the environment.\nThis work has been financially supported by proje
 ct MMRE_P57561 from the Natural Environment Research Council.\n1.     
 Xie\, F.\, et al.\, Tunable synthesis of ordered Zinc Oxide nanoflower-lik
 e arrays. Journal of Colloid and Interface Science\, 2013. 395: p. 85-90.\
 n2.     Wang\, T.\, et al.\, Broadband enhanced fluorescence using zin
 c-oxide nanoflower arrays. Journal of Materials Chemistry C\, 2015. 3(11):
  p. 2656-2663.\n 
URL:https://www.imperial.ac.uk/events/100840/multimodal-characterisation-of
 -engineered-nanomaterials-in-the-environment/
DTSTART;TZID=Europe/London:20170508T120000
DTEND;TZID=Europe/London:20170508T130000
LOCATION:United Kingdom
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