Title

Synthesis Of Cation-Exchanged Laponite Suspensions By Laser Ablation Of Microsized-Metal Particles In Liquid

Keywords

Cation-exchange laponite; Laser ablation; Rheology; Thixotropy

Abstract

Laser ablation in the liquid technique has been used to synthesize cation-exchanged laponite suspensions. In summary, laser ablation of the microsize-metal powder (Co, Al, and Cu) dispersed in an aqueous solution containing deionized water laponite crystals was carried out using laser beam generated by a single-mode, Q-switched NdYag laser operating at 532 nm with a pulse duration of 5.5 ns and 10 Hz repetition rate. Laser fluence was 0.265 J/cm2 for all tests. For all samples, the mass fraction of laponite was 1%. General observations of the prepared samples indicated that an aqueous suspension of 1 wt% laponite retained its free flowing liquid phase characteristics even after aging for several weeks. When bivalent cationic metals (Cu, Co, Al) were ablated in it for about 1 h, even with a small amount of the metal (0.025% and 0.050%) were generated, the suspension became highly viscous and behaved as a shear-thinning and thixotropic material. That is, the suspension gelled strongly when it was allowed to rest. The gels, however, could easily be reverted to a low viscosity liquid with simple shaking. Information from TEM and XRD analysis indicated that such a solgel transformation might be due to the charge exchange between the cationic species produced during the laser ablation and the sodium ions in the interlayers of the clay sheets.

Publication Date

3-1-2011

Publication Title

Optics and Lasers in Engineering

Volume

49

Issue

3

Number of Pages

396-402

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.optlaseng.2010.11.010

Socpus ID

78650827295 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/78650827295

This document is currently not available here.

Share

COinS