scholarly journals New insights into the solubility of graphene oxide in water and alcohols

2017 ◽  
Vol 19 (26) ◽  
pp. 17000-17008 ◽  
Author(s):  
Vadim V. Neklyudov ◽  
Nail R. Khafizov ◽  
Igor A. Sedov ◽  
Ayrat M. Dimiev
Keyword(s):  
Graphene Oxide ◽  
Chemical Interactions ◽  
The Stability

Here we demonstrate that the solubility of GO, and the stability of as-formed solutions depend not just on the solute and solvent cohesion parameters, as commonly believed, but mostly on the chemical interactions at the GO/solvent interface.

scholarly journals Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 70
Author(s):  
Maria Raposo ◽  
Carlota Xavier ◽  
Catarina Monteiro ◽  
Susana Silva ◽  
Orlando Frazão ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Layer By Layer ◽  
Film Stability ◽  
A Value ◽  
Device Reliability ◽  
Sensor Devices ◽  
Lbl Films ◽  
The Stability

Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

Chemical interactions and ecotoxicity effects between graphene oxide and Lemna gibba

2021 ◽  
pp. 1-9
Author(s):  
Federica Valentini ◽  
Mattia Di Giacobbe ◽  
Lucia Bertuccini ◽  
Francesca Iosi ◽  
Klaudia Krasojevic ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lemna Gibba ◽  
Chemical Interactions

The Significance of Graphene Oxide-Polyacrylamide Interactions on the Stability and Microstructure of Oil-in-Water Emulsions

Langmuir ◽  
2018 ◽  
Vol 34 (43) ◽  
pp. 12870-12881 ◽  
Author(s):  
Heidi Jahandideh ◽  
Pejman Ganjeh-Anzabi ◽  
Steven L. Bryant ◽  
Milana Trifkovic
Keyword(s):  
Graphene Oxide ◽  
Oil In Water ◽  
The Stability

Preparation of Stable Hydrophilic Polyethyleneimine Cross-Linked Graphene Oxide/Titanium Dioxide Membranes for Dye Separation

NANO ◽  
2021 ◽  
pp. 2150008
Author(s):  
Hongwei Liu ◽  
Jinhua Liu ◽  
Jun Li ◽  
Zhanchao Liu ◽  
Weifu Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Graphene Oxide ◽  
Water Flux ◽  
Cross Linking ◽  
Sunset Yellow ◽  
Water Contact ◽  
Static Water ◽  
The Cross ◽  
The Stability

An excellent novel laminar and hierarchical polyethyleneimine cross-linked graphene oxide/titanium dioxide (GO–TiO2–PEI) membrane was successfully prepared by vacuum filtration technology using polyethyleneimine (PEI) as the cross-linking agent and a GO–TiO2 nanocomposite as the substrate. The resultant membrane (GO–TiO2–PEI) displayed a favorable antifouling performance with bovine serum albumin (BSA) and showed good hydrophilicity and wettability, with a static water contact angle of 13.2∘. The stability of the GO–TiO2–PEI membrane in aqueous solution obviously improved with the cross-linking of PEI compared with that of the GO and GO–TiO2 membranes. The GO–TiO2–PEI membrane also exhibited a satisfactory water flux of 48.6[Formula: see text]L m[Formula: see text] h[Formula: see text] bar[Formula: see text]. The GO–TiO2–PEI membrane exhibited a good performance for effectively separating different dyes including methylene blue (MB), rhodamine B (RB), methyl orange (MO), sunset yellow (SY), new coccine (NC) and amaranth. All the above results suggested that the GO–TiO2–PEI membrane could be used as an excellent stable hydrophilic membrane for efficiently separating dyes from aqueous solution.

Investigation of the stability of QCM humidity sensor using graphene oxide as sensing films

2014 ◽  
Vol 191 ◽  
pp. 779-783 ◽  
Author(s):  
Yao Yao ◽  
Xiangdong Chen ◽  
Xiaoyu Li ◽  
Xinpeng Chen ◽  
Ning Li
Keyword(s):  
Graphene Oxide ◽  
Humidity Sensor ◽  
The Stability

Long-term stability of Si-organic hybrid solar cells with a thermally tunable graphene oxide platform

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72342-72350 ◽  
Author(s):  
Beo Deul Ryu ◽  
Jung-Hwan Hyung ◽  
Min Han ◽  
Gil-Sung Kim ◽  
Nam Han ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Solar Cell ◽  
Critical Role ◽  
Hybrid Solar Cells ◽  
Long Term Stability ◽  
Organic Hybrid ◽  
Annealing Temperatures ◽  
Si Solar Cell ◽  
The Stability

The PEDOT:PSS/Si solar cell with a rGO layer enhances the stability in a package-free device as the rGO layer with various annealing temperatures plays a critical role as a passivation layer in the PEDOT:PSS/Si interface.

Influence of graphene oxide nanosheets on the stability and thermal conductivity of nanofluids

2018 ◽  
Vol 135 (1) ◽  
pp. 581-595 ◽  
Author(s):  
Mir-Shahabeddin Izadkhah ◽  
Hamid Erfan-Niya ◽  
Saeed Zeinali Heris
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Graphene Oxide Nanosheets ◽  
The Stability

scholarly journals Physicochemical and Biological Properties of Graphene-Oxide-Coated Metallic Materials

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5752
Author(s):  
Aleksandra Poniatowska ◽  
Paulina Anna Trzaskowska ◽  
Maciej Trzaskowski ◽  
Tomasz Ciach
Keyword(s):  
Graphene Oxide ◽  
Biological Properties ◽  
Negative Control ◽  
L929 Cells ◽  
Potential Applications ◽  
Direct Cell ◽  
Future Potential ◽  
The Stability ◽  
Modified Hummers Method ◽  
Modification Of The Surface

In this article, we present graphene oxide (produced by a modified Hummers’ method) coatings obtained using two different methods: electrophoretic deposition on 316L stainless steel and chemical modification of the surface of gold applied to the steel. The coating properties were characterized by microscopic and spectrometric techniques. The contact angle was also determined, ranging from 50° to 70°. Our results indicated that GO coatings on steel and gold were not toxic towards L929 cells in a direct cell adhesion test—on all tested materials, it was possible to observe the growth of L929 cells during 48 h of culture. The lack of toxic effect on cells was also confirmed in two viability tests, XTT and MTT. For most of the tested materials, the cell viability was above 70%. They showed that the stability of the coating is the crucial factor for such GO coatings, and prove that GO in the form of coating is non-toxic; however, it can show toxicity if detached from the surface. The obtained materials also did not show any hemolytic properties, as the percentage of hemolysis was on the level of the negative control, which is very promising in the light of future potential applications.

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