Protein immobilization on graphene oxide or reduced graphene oxide surface and their applications: Influence over activity, structural and thermal stability of protein

2021 ◽  
Vol 289 ◽  
pp. 102367
Author(s):  
Karan Chaudhary ◽  
Krishan Kumar ◽  
Pannuru Venkatesu ◽  
Dhanraj T. Masram
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Protein Immobilization ◽  
Oxide Surface ◽  
Reduced Graphene ◽  
Thermal Stability Of

Synthesis and investigation of thermal properties of PMMA-maleimide-functionalized reduced graphene oxide nanocomposites

2018 ◽  
Vol 33 (1) ◽  
pp. 85-96
Author(s):  
Thangamani Rajkumar ◽  
Nagamuthu Muthupandiyan ◽  
Chinnaswamy Thangavel Vijayakumar
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Interaction ◽  
Weight Percent ◽  
Bulk Polymerization ◽  
Pmma Matrix ◽  
Uniform Dispersion ◽  
Reduced Graphene ◽  
Thermal Stability Of

Reduced graphene oxide (RGEO) and N-[4-(chlorocarbonyl)phenyl]maleimide-functionalized reduced graphene oxide (MFRGEO) were used as nanofillers for polymethyl methacrylate (PMMA) matrix nanocomposites to enhance thermal stability. Methyl methacrylate containing nanofiller of four different weight percent (0.2, 0.4, 0.6, and 0.8) was polymerized using ultrasonic radiation-assisted bulk polymerization. The Fourier-transform infrared spectra showed the absence of chemical interaction between the filler and the matrix phase. Morphology of nanocomposites studied using scanning electron microscope confirmed the assistance aided by ultrasonication in the uniform dispersion of nanofiller in the PMMA matrix. Thermogravimetric (TG) study revealed the presence of MFRGEO enhanced the thermal stability of PMMA by shifting the entire degradation to higher temperature. The thermal stability of PMMA nanocomposite was improved by as much as 40°C at just 0.8 wt% loading of MFRGEO. Differential TG study also supported the role of maleimide functionalization on RGEO in the enhancement of thermal stability of PMMA by means of retarding the degradation rate of unsaturated chain ends in the PMMA matrix. Unlike MFRGEO, RGEO failed to enhance the thermal stability of PMMA.

scholarly journals Reduced Graphene Oxide Improves Moisture and Thermal Stability of Perovskite Solar Cells

2020 ◽  
Vol 1 (5) ◽  
pp. 100053 ◽  
Author(s):  
Hui-Seon Kim ◽  
Bowen Yang ◽  
Minas M. Stylianakis ◽  
Emmanuel Kymakis ◽  
Shaik M. Zakeeruddin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Solar Cells ◽  
Reduced Graphene Oxide ◽  
Perovskite Solar Cells ◽  
Reduced Graphene ◽  
Thermal Stability Of

scholarly journals Morphology and Thermal Properties of Calcium Alginate/Reduced Graphene Oxide Composites

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 990 ◽  
Author(s):  
Wanting Zhao ◽  
Yan Qi ◽  
Yue Wang ◽  
Yun Xue ◽  
Peng Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Calcium Alginate ◽  
Formation Rate ◽  
Carbon Formation ◽  
High Heat Transfer ◽  
Reduced Graphene ◽  
Thermal Stability Of

Calcium alginate (CaAlg) is a kind of biodegradable and eco-friendly functional material, and CaAlg/reduced graphene oxide (rGO) composites are expected to be applied as new textile, heat-generating, and flame-retardant materials. In this paper, the CaAlg/rGO composites were prepared by a sol-gel method and their morphological and thermal properties were studied. The results showed that the introduction of rGO can efficiently improve the thermal stability of CaAlg. Further study showed that rGO increased the carbon formation rate by 4.1%, indicating that the thermal stability was improved by the promotion of carbon formation. Moreover, the weight loss rate of the composites was faster at 180–200 °C than that of CaAlg, after which the rate was less comparatively, suggesting the better thermal stability of the composite. This maybe because the high heat transfer efficiency of rGO allowed the material to reach the temperature of the thermal decomposition of the glycan molecule chain within a short time, and then promoted carbon formation. The thermal cracking mechanism of the composites is proposed based on the experimental data.

scholarly journals Improvement in conductivity and thermal stability of polystyrene with two-step reduced graphene oxide based nanocomposite Graphene /polystyrene

2014 ◽  
Vol 17 (2) ◽  
pp. 90-99
Author(s):  
Vy Tuong Nguyen ◽  
An Nang Vu ◽  
Huy Thuc Ha
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Glass Transition ◽  
Elastic Modulus ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Microemulsion Synthesis ◽  
Thermal Stability Of ◽  
Graphene Oxide Sheets

In insitu microemulsion synthesis, we have synthesized successfully nanocomposite based on polystyrene (PS) and two-step reduced graphene oxide sheets with heat and NaBH4 agent after they had been treated by monoglyceride. Resulted Nanocomposite has been better in electrical conductivity (approximately 2,01 × 10-2S / cm), thermal stability (increased about 120 oC) and physical properties (glass transition temperatureincreasesof over 6.40 oC, elastic modulus increases by 45 %) than the pure PS properties.

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