Journal article
Effect of Edge Charges on Stability and Aggregation of Ti3C2Tz MXene Colloidal Suspensions
Journal of physical chemistry. C, v 122(48), pp 27745-27753
06 Dec 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Herein, the stabilities of aqueous Ti3C2Tz (MXene) colloidal suspensions were studied as a function of pH and sodium chloride concentrations using ς-potential and dynamic light scattering measurements. Complete sedimentation was observed when the pH was changed to 5 or 10. In the low pH regime, protons saturate the surface functional groups, rendering the ς-potential less negative that, in turn, leads to aggregation. In the high pH regime, the ς-potential remained constant up to a pH of almost 12. As the molarity of NaCl increases from 0 to 0.04, the ς-potential goes from −35 to −22.5 mV. At a molarity of 0.02, sedimentation was observed. When the pH or NaCl concentration is high, sedimentation occurred, presumably, because of a reduction in the double-layer thickness. In all cases, the sediment comprised crumpled Ti3C2Tz flakes. After adding charged nanoparticles to the colloidal suspension, at neutral pH, subsequent transmission electron microscope micrographs showed that the negative gold nanoparticles preferred the edges, whereas the positive ones preferred the surfaces. The charge differences between the edges and faces open opportunities for direct edge or face-specific organic functionalizations, similar to work done on other two-dimensional materials.
Metrics
Details
- Title
- Effect of Edge Charges on Stability and Aggregation of Ti3C2Tz MXene Colloidal Suspensions
- Creators
- Varun Natu - Drexel UniversityMaxim Sokol - Drexel UniversityLouisiane Verger - Drexel UniversityMichel Barsoum - Drexel University
- Publication Details
- Journal of physical chemistry. C, v 122(48), pp 27745-27753
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000452693300068
- Scopus ID
- 2-s2.0-85058194166
- Other Identifier
- 991019169709404721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology