Strong Acid-Nonionic Surfactant Lyotropic Liquid-Crystalline Mesophases as Media for the Synthesis of Carbon Quantum Dots and Highly Proton Conducting Mesostructured Silica Thin Films and Monoliths

Langmuir : the ACS Journal of Surfaces and Colloids
Elif B OlutaşOmer Dag

Abstract

Lyotropic liquid-crystalline (LLC) materials are important in designing porous materials, and acids are as important in chemical synthesis. Combining these two important concepts will be highly beneficial to chemistry and material science. In this work, we show that a strong acid can be used as a solvent for the assembly of nonionic surfactants into various mesophases. Sulfuric acid (SA), 10-lauryl ether (C12E10), and a small amount of water form bicontinuous cubic (V1), 2D-hexagonal (H1), and micelle cubic (I1) mesophases with increasing SA/C12E10 mole ratio. A mixture of SA and C12E10 is fluidic but transforms to a highly ordered LLC mesophase by absorbing ambient water. The LLC mesophase displays high proton conductivity (1.5 to 19.0 mS/cm at room temperature) that increases with an increasing SA content up to 11 SA/C12E10 mole ratio, where the absorbed water is constant with respect to the SA amount but gradually increases from a 2.3 to 4.3 H2O/C12E10 mole ratio with increasing SA/C12E10 from 2 to 11, respectively. The mixture of SA and C12E10 slowly undergoes carbonization to produce carbon quantum dots (c-dots). The carbonization process can be controlled by simply controlling the water content of the media, and it can be...Continue Reading

References

Feb 12, 2004·Journal of the American Chemical Society·Yanjie XuDouglas L Gin
Jun 15, 2006·Journal of the American Chemical Society·Ya-Ping SunSu-Yuan Xie
Jul 24, 2008·Chemical Society Reviews·Tamar L Greaves, Calum J Drummond
Sep 8, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Martin J HollambyRichard K Heenan
Jun 22, 2010·Chemical Reviews·Renhao Dong, Jingcheng Hao
Mar 19, 2015·Chemical Communications : Chem Comm·Renata NegriniRaffaele Mezzenga
Apr 8, 2015·ACS Applied Materials & Interfaces·K A Shiral FernandoYa-Ping Sun

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