Chemical conversion of biomass-derived hexose sugars to levulinic acid over sulfonic acid-functionalized graphene oxide catalysts

2013 ◽  
Vol 15 (10) ◽  
pp. 2935 ◽  
Author(s):  
Pravin P. Upare ◽  
Ji-Woong Yoon ◽  
Mi Yeon Kim ◽  
Hyo-Yoon Kang ◽  
Dong Won Hwang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sulfonic Acid ◽  
Levulinic Acid ◽  
Chemical Conversion ◽  
Oxide Catalysts ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Hexose Sugars

Effect of Amine Molecular Chain Length on the Mechanical and Thermal Properties of Functionalized Graphene Oxide/Polyurea Nanocomposites

2021 ◽  
Vol 13 (2) ◽  
pp. 199-208
Author(s):  
Qiang Zhao ◽  
Si Ouyang ◽  
Gang Chen ◽  
Yiqing Deng ◽  
Mengxiao Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Chemical Conversion ◽  
Mechanical And Thermal Properties ◽  
Functionalized Graphene ◽  
Scanning Calorimetry ◽  
Functionalized Graphene Oxide ◽  
New Approach ◽  
Chain Lengths

To improve the overall performance of polyurea, linear diamines with three different chain lengths (1,2-ethylenediamine (EDA) and amino-terminated polyoxypropylenes D230 and D2000) were reacted with graphene oxide (GO) by reaction of amines with carboxyl groups, and three different amino-functionalized graphene oxide (AGO) nanosheets (EDA-GO, D230-GO and D2000-GO) were prepared. Subsequently, an AGO flake was bonded to a polyurea (PUA) substrate by an in situ chemical process. Analytical tests, including X-ray photoelectron spectroscopy (XPS), showed that diamines were attached to the GO flake. The reinforcement properties of the nanocomposites were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and tensile testing. AGO nanosheets, especially EDA-GO, result in a certain degree of enhancement in the thermal and mechanical properties of nanocomposites formed with polyurea. The TGA and DSC results indicated that the T5% and Tg of the nanocomposites at low AGO loading were increased compared with those of pure polyurea. Meanwhile, the elongation at break of the nanocomposite film with 0.1 wt% EDA-GO loading was 240% higher than that of pure polyurea, and tensile strength was increased by 80% over that of pure polyurea. We provide a new approach to the chemical conversion of GO/PUA nanocomposites by preparing AGO and complexing it with polyurea.

Design and fabrication of sulfonic acid functionalized graphene oxide for enriched fluoride adsorption

2021 ◽  
pp. 108446
Author(s):  
Antonysamy Jeyaseelan ◽  
Khadijah Mohammedsalesh M. Katubi ◽  
Norah Salem Alsaiari ◽  
Mu. Naushad ◽  
Natrayasamy Viswanathan
Keyword(s):  
Graphene Oxide ◽  
Sulfonic Acid ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Fluoride Adsorption

Polymer Functionalized Graphene Oxide: A Versatile Nanoplatform for Drug/Gene Delivery

2015 ◽  
Vol 19 (18) ◽  
pp. 1828-1837 ◽  
Author(s):  
George V. Theodosopoulos ◽  
Panayiotis Bilalis ◽  
Georgios Sakellariou
Keyword(s):  
Graphene Oxide ◽  
Gene Delivery ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide
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