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Halloysite nanotubes based electrochemical sensors: A review
Goda, Emad S.,Gab-Allah, M.A.,Singu, Bal Sydulu,Yoon, Kuk Ro Elsevier 2019 Microchemical journal Vol.147 No.-
<P><B>Abstract</B></P> <P>Among the clays, halloysite nanotubes (HNTs) are fabulous hollow tubular type of aluminosilicates due to their interesting properties such as their natural occurrence, high surface area and cytocompatibility. Different ways of functionalization for the inner and surface of HNTs have been used to control their properties for specific applications. Moreover, the modified HNTs are considered a precious carrier for nanomaterials for improving their dispersion and can be designated for electrochemical sensing application due to their high surface area. The free lumen that was in HNTs can be utilized for hosting other compounds for obtaining nanostructures with excellent synergistic properties.</P> <P>The main purpose of this review is for the first time conducting a survey on the reports for engineering the HNTs surface to be used as an electrochemical sensor for identifying various analytes such as hydrogen peroxide, glucose, nitrite, ascorbic acid, surface plasmon resonance, catechol amines, hydrazine, dopamine and uric acid. Moreover, the latest procedures for the modification of HNTs with specified applications have been also described.</P> <P><B>Highlights</B></P> <P> <UL> <LI> HNTs are marvelous nanotubular materials which can be utilized for various applications. </LI> <LI> The inner and external surface of HNTs could show distinguished surface chemistry. </LI> <LI> HNTs can be modified using various for improving their properties for specified uses. </LI> <LI> The nanocomposites containing HNTs could be an efficient electrochemical sensor based on their properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Halloysite nanotubes as smart flame retardant and economic reinforcing materials: A review
Goda, Emad. S.,Yoon, Kuk Ro,El-sayed, Shimaa H.,Hong, Sang Eun Elsevier 2018 Thermochimica acta Vol.669 No.-
<P><B>Abstract</B></P> <P>Halloysite nanotubes (HNTs) are precious clay materials with a hollow nanotubular structure. They are used up to date latent for synthesizing polymeric nanocomposite because of high surface area, low cost and the natural existence. HNTs nanocomposites have been fabricated using different methods; however, the widely used is melt mixing technique. The functionalization of HNTs is very crucial to achieve the well dispersion in polymer. The flammability, thermal stability and mechanical properties were improved by the addition of HNTs. Because of the tube shape of HNTs, it can help in trapping the flammable volatiles besides, HNTs can form a strong barrier on the surface of polymer against heat and mass transport processes. The essential aim of this review is the latest researches on modified halloysite nanotubes as an efficient flame retardant for various polymer nanocomposites and their influence on the mechanical properties and thermal stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> HNTs are promising nanomaterials which have a tubular shape and can be designed for many applications. </LI> <LI> HNTs are used to prepare polymer nanocomposites using various methods. </LI> <LI> The functionalization of HNTs surface is very important for improving dispersion in polymer. </LI> <LI> Well dispersed HNTs in polymer can enhance the flammability, thermal stability and mechanical properties of polymer. </LI> <LI> HNTs can retard the flame using two commonly mechanisms (Condensed and gas phase). </LI> </UL> </P>
SINGUBALSYDULU,Emad S. Goda,윤국로 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
In the present work, multiwall carbon nanotubes (CNTs) were used as a reducing agent for thepreparation of CNT-MnO2 nanocomposites by varying the amount of potassium permanganate (KMnO4). The chemical compositions of the as-synthesized materials were analyzed using X-ray diffraction,Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, which showed theformation of MnO2 in the CNT-MnO2 nanocomposites. The electrochemical properties of the CNT-MnO2nanocomposites were thoroughly investigated through cyclic voltammetry, charge–discharge, andimpedance studies. The CNT-MnO2-25 nanocomposites appeared with the highest specific capacitance of674 F g 1 at a current density of 2 A g 1; they also displayed an excellent capacitance retention of110%even after the completion of 5000 continuous charge–discharge cycles at 10 A g 1.