Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles

Abstract

Development of systems for capture, sequestration, and tracking of nanoparticles (NPs) is becoming a significant focus in many aspects of nanotechnology and environmental research. These systems enable a broad range of applications for evaluating concentration, distribution, and effects of NPs for environmental, clinical, epidemiological, and occupational exposure studies. Herein, we describe the first example of a ligand-graft multifunctional platform for capture and detection of cerium oxide (CeO or ceria) NPs. The approach involves the use of redox-active ligands containing o-dihydroxy functionality, enabling multivalent binding, surface retention, and formation of charge transfer complexes between the grafted ligand and the NPs. Using this strategy, paper-based and microarray-printed platforms with NP-capture ability involving either catechol or ascorbic acid as ligands were successfully fabricated. Surface modification was determined by infrared spectroscopy, electron microscopy, X-ray spectroscopy, and thermogravimetric analysis. Functionality was demonstrated for the rapid assessment of NPs in chemical mechanical planarization (CMP) slurries and CMP wastewaters. This novel approach can enable further development of devices and separation technologies including platforms for retention and separation of NPs and measurement tools for detection of NPs in various environments.

Oxidative Stress in the Muscles of the Fish Nile Tilapia Caused by Zinc Oxide Nanoparticles and Its Modulation by Vitamins C and E

“…This confirms the ability of both vitamin C and E to fight the oxidative damage results from ZnONP exposure. Our results were confirmed by previous observations; recently, vitamin C has been used to prepare a ligand for cerium oxide NPs as promising tool for facilitating NP detections in tissues [ 57 ]. This explained how much it has the power for binding of NPs; this illustrated the efficacy of vitamin C to tight bind to NPs and do its action.…”

Modulatory effect of dietary copper nanoparticles and vitamin C supplementations on growth performance, hematological and immune parameters, oxidative status, histology, and disease resistance against Yersinia ruckeri in rainbow trout (Oncorhynchus mykiss)

“…This ability of VCs to combat possible oxidative damage was caused by exposure to Cu-NPs. Othman et al (2017) explained that they used VC to prepare ligands for cerium oxide nanoparticles as a tool to facilitate the detection of NP in tissues because they suggested that VC could bind tightly to NPs and showed its performance. It has also been reported that the presence of NPs themselves can increase the VC activity (Astete et al 2011).…”

Eu-Doped Ceria Nanocrystals as Nanoenzyme Fluorescent Probes for Biosensing

“…Deconvoluted peaks were used for calculating the concentration of Ce 3+ . The Ce 3d spectrum (Figure ) of Ce NCs shows the spin orbit doublets for pure ceria, 3d 3/2 and 3d 5/2 with binding energy peaks at 882 and 903 eV corresponding to the Ce 3+ oxidation state, and peaks at 879, 896, and 912 eV corresponding to the Ce 4+ oxidation state. − This result clearly indicates the presence of mixed oxidation states of Ce 3+ and Ce 4+ species on the NC’s surface. Similar peak fitting was also done for the XPS of Ce doped with Eu 3+ (Figure ).…”