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Title: Efficient Route of Wrapping Multi-Wall Carbon Nanotubes with Aramid Oligomers for the Preparation of Analytical Microextraction Sorbent
Authors: Randa Abd Almoaeen 
Supervisor: Prof.Adel Fahmy Shoukry
Degree Awarded: Master's Degree in: Chemistry
Keywords: Solid Phase Microextraction, Aramid, Sol-gel, Chromatography, Carbon nanotubes.
Issue Date: 2019
Publisher:  Kuwait university - college of graduate studies
Abstract: Sol-gel method was implemented for the preparation of novel and multi-functional microextraction sorbent to be utilized for fiber-based solid-phase microextraction (SPME). The proposed sorbent showed stability over a long-term life gained by the stability of the sol-gel component. An Aramid-wrapped multiwall carbon nanotube was used to enhance the mechanical and physiochemical properties of the sorbent. The sorbent was evaluated for the extraction of different polycyclic aromatic hydrocarbons (PAHs). Run-to-Run reproducibility was evaluated to ensure the robustness of the proposed preparation route. Sorbent characterization such as FTIR, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), were conducted in order to validate the proposed method in addition to the other analytical parameters such limits of detection, limits of quantifications, enrichment factor, linearity selectivity and sensitivity. Gas chromatography-mass spectrometry (GC-MS) was utilized in hyphenation with the proposed SPME tool. The functionalization was done for the creation of a nano-composite combining the properties of polymeric materials along with Nano materials. The wrapping of the MWCNTs by the oligomer was achieved by using a linker to firmly link the Aramid oligomer and the MWCNTs particles through the sol gel network. APTES was used as a linker for its well-known high reactivity. the FTIR results confirmed the coupling of the Aramid oligomer with the MWCNTs in the sol-gel network. SEM pictures revealed the extra porous structure of the material. The enhancement of the sorbent properties was exhibited by exposing the fiber for many times to high temperature (300OC) during the GC analysis. The extraction of the PAHs compounds with different concentrations, showed very low limits of detections and limits of quantifications.
Appears in Programs:0420 Chemistry (M.Sc.)

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