Interpreting unique colloidal response of TiO2 nanomaterials to controlled sonication for understanding of their assembly configuration in water

2016 ◽  
Vol 16 (6) ◽  
pp. 1768-1775
Author(s):  
Siyang Wu ◽  
Hyeok Choi
Keyword(s):  
Environmental Conditions ◽  
Aquatic Environment ◽  
Fate And Transport ◽  
Intrinsic Property ◽  
Engineered Nanomaterials ◽  
Time Resolved ◽  
Tio2 Particles ◽  
Transport Behavior ◽  
Tio2 Nanomaterials

It is important to determine the assembly configuration of engineered nanomaterials (ENMs) because assembly configuration influences their fate and transport behavior in the aquatic environment. Aggregated particles are more subject to segregation upon changes of environmental conditions (and vice versa) than agglomerated particles. As a strategic tool for investigating the time-resolved reversible segregating and assembling behavior of ENMs and thus estimating their assembly configuration, a controlled sonication process was proposed. It was hypothesized that the unique colloidal response of ENMs to sonication, with respect to changes in size, might be their intrinsic property associated with assembly configuration. As a model ENM, three different TiO2 particles with unique properties (commercial P-25 and UV 100 and home-made (HM) TiO2) were examined with programmed sonication processes under various environmental settings. When they were dispersed in water, all TiO2 particles tested obviously assembled to form much larger clusters. Size of P-25 decreased immediately upon sonication and did not change under the subsequent quiescence step while sizes of UV 100 and HM gradually decreased and then slowly recovered back to their initial sizes. The trend was generally observed in all conditions tested. The unique colloidal response of TiO2 could be explained by its properties associated with assembly configuration.

Ecotoxicity Effects of Nanomaterials on Aquatic Organisms

2016 ◽  
pp. 330-351 ◽  
Author(s):  
César A Barbero ◽  
Edith Inés Yslas
Keyword(s):  
Adverse Effects ◽  
Surface Charge ◽  
Direct Effect ◽  
Mechanism Of Action ◽  
Aquatic Environment ◽  
Physicochemical Characteristic ◽  
Aquatic Organisms ◽  
Development Stage ◽  
Engineered Nanomaterials ◽  
Toxicity Data

The increasing production and use of engineered nanomaterials raise concerns about inadvertent exposure and the potential for adverse effects on the aquatic environment. The aim of this chapter is focused on studies of nanotoxicity in different models of aquatic organisms and their impact. Moreover, the chapter provides an overview of nanoparticles, their applications, and the potential nanoparticle-induced toxicity in aquatic organisms. The topics discussed in this chapter are the physicochemical characteristic of nanomaterials (size, aggregation, morphology, surface charge, reactivity, dissolution, etc.) and their influence on toxicity. Further, the text discusses the direct effect of nanomaterials on development stage (embryonic and adult) in aquatic organisms, the mechanism of action as well as the toxicity data of nanomaterials in different species.f action as well as the toxicity data of nanomaterials in different species.

scholarly journals A Review of the Properties and Processes Determining the Fate of Engineered Nanomaterials in the Aquatic Environment

2015 ◽  
Vol 45 (19) ◽  
pp. 2084-2134 ◽  
Author(s):  
Willie J. G. M. Peijnenburg ◽  
Mohammed Baalousha ◽  
Jingwen Chen ◽  
Qasim Chaudry ◽  
Frank Von der kammer ◽  
...  
Keyword(s):  
Aquatic Environment ◽  
Engineered Nanomaterials

scholarly journals Exposure medium and particle ageing moderate the toxicological effects of nanomaterials to Daphnia magna over multiple generations: a case for standard test review?

2020 ◽  
Vol 7 (4) ◽  
pp. 1136-1149 ◽  
Author(s):  
Laura-Jayne A. Ellis ◽  
Eugenia Valsami-Jones ◽  
Iseult Lynch
Keyword(s):  
Daphnia Magna ◽  
Aquatic Environment ◽  
Biological Process ◽  
Standard Test ◽  
Engineered Nanomaterials ◽  
Multiple Generations ◽  
Toxicological Effects ◽  
Test Review

Pristine engineered nanomaterials (NMs) entering the aquatic environment become ‘aged’ during their lifetime via chemical, physical and/or biological process.

The Effect of Impurities in the SPE Kinetics in GaAs

1985 ◽  
Vol 52 ◽  
Author(s):  
C. Licoppe ◽  
Y. I. Nissim ◽  
C. Meriadec
Keyword(s):  
Solid Phase ◽  
Intrinsic Property ◽  
Interface Structure ◽  
Interface Evolution ◽  
Time Resolved ◽  
Substitutional Impurity ◽  
Effect Of Impurities ◽  
Interface Roughening ◽  
Kinetics Of ◽  
Crystal Interface

ABSTRACTSolid phase epitaxial (SPE) growth of ion implanted GaAs layers has been studied using the time resolved reflectivity technique. A series of implanted impurities have been selected to study the dependance of the nature of the impurity on the growth kinetics. It has been found that the activation energy and the kinetics of growth were independant on the choice of implanted substitutional impurity. Only impurities such as Argon were responsible of a large decrease in the regrowth rate. The same technique is shown to bring informations on the amorphous-crystal interface structure during growth. From these informations it has been possible to show that interface roughening occured during SPE in (100) GaAs. This interface evolution is an intrinsic property of the implanted GaAs material.

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