UPSI Digital Repository (UDRep)
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Abstract : Universiti Pendidikan Sultan Idris |
The versatilities of calixarenes have been known primarily in the host-guest world. In this work, two calix[4]arenes, namely C-DHC4 and N-DHC4, possess the same lower rim but are distinct in the upper rim. The Langmuir Isotherm and optical properties have been carried out using Langmuir?Blodgett trough and UV-Visible spectroscopy, respectively. The topographical image of the calix[4]arenes has been observed using FESEM, and lead cation entrapments of these calix[4]arenes have been inspected using the surface potential sensor. The isotherm graph revealed the size of each calixarene; C-DHC4 ~ 1.90 nm2 and N-DHC4 ~ 2.10 nm2 . The UV-Visible result demonstrated that each calix[4]arene has two firm absorption peaks where C-DHC4 has two broad peaks, which lie in 261 and 330 nm, while N-DHC4 has two shoulders at 275 and 282 nm. FESEM images have shown the formation of calix[4]arene nanocluster. Further monitoring on the surface potential and effective dipole moment indicate that C-DHC4 perform significant and stable results in detecting Pb2+ cations compared to N-DHC4. This study has demonstrated that detection limit as low as 1.25 x 10-2 mM, making the ?V and �? measurements a reliable method for detecting Pb2+ ions and their potential in this nanosensor field. ?Malaysian Journal of Microscopy (2021). All rights reserved. |
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