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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Layer-by-layer composite of anionic and cationic clays by metathesis
B R Venugopal1, Michael Rajamathi
1Materials Research Group, Department of Chemistry, St. Joseph's College, 36 Lalbagh Road, Bangalore 560 027, India.
Journal of Colloid and Interface Science
|January 11, 2011
Summary
A novel composite material was created by layering nickel aluminum layered double hydroxide (LDH) and smectite clay. This composite exhibits unique thermal decomposition properties, with the LDH degrading to NiO while the clay structure remains intact at high temperatures.
Area of Science:
- Materials Science
- Nanotechnology
- Clay Science
Background:
- Layered double hydroxides (LDHs) and smectite clays are important layered materials with diverse applications.
- Intercalation of organic species modifies the properties of these layered solids.
- Layer-by-layer assembly offers a route to create advanced composite materials.
Purpose of the Study:
- To synthesize an alternately stacked layer-by-layer composite of nickel aluminum LDH and smectite clay.
- To investigate the thermal decomposition behavior of the synthesized composite.
- To compare the thermal properties of the composite with its parent materials.
Main Methods:
- Solvothermal treatment of monolayer colloidal dispersions in 1-octanol.
- Alternately stacking oppositely charged layered solids: dodecylsulfate intercalated nickel aluminum LDH and cetyl trimethylammonium intercalated smectite.
- Thermal analysis to study decomposition behavior.
Main Results:
- Successfully obtained an alternately stacked layer-by-layer composite.
- The composite exhibited altered thermal decomposition compared to the parent solids.
- Upon heating, the LDH component decomposed to NiO.
- The smectite clay layer structure was retained up to 800°C.
Conclusions:
- Layer-by-layer assembly of intercalated LDH and smectite is feasible.
- The composite demonstrates distinct thermal stability characteristics.
- The differential thermal behavior of components within the composite offers potential for tailored material design.
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