Application of Atomic Force Microscopy Characterization Technology in MgAl-CO₃^2--LDH Exfoliation Behavior

Abstract:

MgAl-CO₃^2--LDH was exfoliated via two-step ultrasonic treatment in formamide. Atomic force microscopy (AFM) was employed to characterize the thickness variation of MgAl-CO₃^2--LDH during exfoliation. MgAl-CO₃^2--LDH was dispersed in formamide with continuous ultrasonic treatment for 4 h, getting a non-transparent turbid liquid. The non-transparent turbid liquid was laid aside one day and separated into two phases, the upper semi-translucent colloidal suspension containing partial exfoliated MgAl-CO₃^2--LDH was dispersed in formamide with continuous ultrasonic treatment again. The AFM results reveal that the thickness of pristine MgAl-CO₃^2--LDH is 250 nm while the MgAl-CO₃^2--LDH nanosheet obtained from the first-step ultrasonic treatment is 90 nm with obvious transverse sliding. The thickness of MgAl-CO₃^2--LDH nanosheet obtained after the second-step ultrasonic treatment is about 7 nm, which is almost in agreement with the theoretical thickness of 10 monolayers of MgAl-CO₃^2--LDH (0.76 nm).

• Periodical: Advanced Materials Research (Volume 1094)
• Pages: 122-126
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1094.122
• Online since: March 2015
• Authors: Jie Zhang, Xiang Li Xie, Cun Jun Li, Hai Wang, Lin Jiang Wang*
• Keywords: Atomic Force Microscope, Exfoliation, MgAl-CO₃^2--LDH, Two-Step Ultrasonic Treatment

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