Colloidal and rheological behavior of aqueous graphene oxide dispersions in the presence of poly(ethylene glycol)

Shu, Ruiwen; Yin, Qing; Xing, Honglong; Tan, Dexin; Gan, Ying; Xu, Guocai

doi:10.1016/j.colsurfa.2015.10.006

Cited by 30 publications

(17 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In Raman spectra of GO, there are two characteristic peaks from 1350 to 1650 cm −1 , representing the D and G peaks in the GO structure . The D peak appears at 1351 cm −1 , is the result of structural imperfection by the attachment of oxygen functionalities to the basal plane of carbon whereas the G peak appears at 1596 cm −1 , which indicates that the stretching motion of sp 2 carbon atoms in plain bonding . Compared with the Raman spectra of GO, the D peak of GO‐IPEG and GO‐PCE shifted from 1351 to 1345 cm −1 and 1248 cm −1 , respectively, indicating that the interaction between the functional groups on GO surface and IPEG or AA monomers has been occurred.…”

Section: Resultsmentioning

confidence: 95%

Fabrication and characterization of graphene oxide modified polycarboxylic by in situ polymerization

Gao

Yao

Hao

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Graphene oxide (GO) was modified by in situ esterification reaction with isopentenol polyoxyethylene ether (IPEG) to obtain GO precursor (GO‐IPEG) with some polymerization activity. GO‐modified polycarboxylic (GO‐PCE) was prepared by GO‐IPEG and acrylic acid (AA) using the method of in situ polymerization. The molecular structure of GO‐IPEG and GO‐PCE was characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectra, and nuclear magnetic resonance (NMR). The dispersion properties and dispersion stability of GO‐IPEG and GO‐PCE in water solution were studied by ultraviolet–visible (UV–vis) absorption spectra, zeta potential, and atomic force microscope. The results of FTIR, Raman, 1H‐NMR, and 13C‐NMR indicate that IPEG was successfully grafted onto the surface of GO and then fabricated with AA by in situ free‐radical polymerization. The results of UV–vis and zeta potential show that GO nanosheets have a better dispersion in GO‐IPEG or GO‐PCE system when the reaction time of GO and IPEG is 1 h, and the dispersion stability can reach up to 1 month. The better dispersion and application property are confirmed by atomic force microscopy image and cement fluidity, water reducing rate, and compression strength. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48316.

show abstract

Section: Resultsmentioning

confidence: 95%

Fabrication and characterization of graphene oxide modified polycarboxylic by in situ polymerization

Gao

Yao

Hao

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The phenomenon indicated that there existed the interaction between GO and Laponite. Furthermore the interaction made GO and Laponite align in the dispersion under the influence of shear flow field . The frequency sweep of the mixed dispersion showed that the loss moduli G ′′ and storage moduli G ′ were frequency‐dependent.…”

Section: Resultsmentioning

confidence: 98%

Strengthening mechanism of poly(acrylamide)/graphene oxide/laponite dual nanocomposite hydrogels

Ling

Yang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

Laponite or graphene oxide (GO) is usually used as a multifunctional crosslinker or a nanofiller to improve the nanocomposite gel strength. To explore the strengthening mechanism of GO/Laponite-based dual nanocomposite hydrogels, we synthesized a dual nanocomposite hydrogel through in situ polymerization of acrylamide (AM) in the dispersion of GO and Laponite. The interactions between GO and Laponite were confirmed by rheological test. GO and Laponite nanosheets were exfoliated well and dispersed uniformly in the hydrogels at low concentration of GO. Crosslinking network and thermal behaviors were investigated with respect to the concentration of GO and Laponite. The gel exhibited a high mechanical strength of 391 kPa with extensibility of 1420% and a high toughness of 2.58 MJ/m 3 , which was expected to be applied in biological engineering field. GO is not a much more effective agent than Laponite due to formation of GO aggregates in high concentration of GO. This work provides a guidance for the synthesis of tough dual nanocomposite hydrogels.

show abstract

“…According to Shu et al (2016), in suspensions with very low concentrations of GO, as the sheets of GO are individually dispersed in the polymer with weak interaction among them, the rheological behavior of the GO suspensions is Newtonian. When the GO concentration is above a critical concentration, the molecules have a certain orientational order, exhibiting a characteristic shearthinning behavior under constant shear flow [29]. According to Shu et al (2016), in suspensions with very low concentrations of GO, as the sheets of GO are individually dispersed in the polymer with weak interaction among them, the rheological behavior of the GO suspensions is Newtonian.…”

Section: Shear Rheology Of Graphene Oxide Suspensionsmentioning

confidence: 99%

“…When the GO concentration is above a critical concentration, the molecules have a certain orientational order, exhibiting a characteristic shearthinning behavior under constant shear flow [29]. According to Shu et al (2016), in suspensions with very low concentrations of GO, as the sheets of GO are individually dispersed in the polymer with weak interaction among them, the rheological behavior of the GO suspensions is Newtonian. When the GO concentration is above a critical concentration, the molecules have a certain orientational order, exhibiting a characteristic shear-thinning behavior under constant shear flow [29].…”

Section: Shear Rheology Of Graphene Oxide Suspensionsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(ethylene glycol) Suspensions

Soares

Cargnin

Naccache

et al. 2020

Fluids

View full text Add to dashboard Cite

This work studies the influence of the concentration and oxidation degree on the rheological behavior of graphene oxide (GO) nanosheets dispersed on polyethylene glycol (PEG). The rheological characterization was fulfilled in shear flow through rotational rheometry measurements, in steady, transient and oscillatory regimes. Graphene oxide was prepared by chemical exfoliation of graphite using the modified Hummers method. The morphological and structural characteristics originating from the synthesis were analyzed by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and atomic force microscopy. It is shown that higher oxidation times increase the functional groups, which leads to a higher dispersion and exfoliation of GO sheets in the PEG. Moreover, the addition of GO in a PEG solution results in significant growth of the suspension viscosity, and a change of the fluid behavior from Newtonian to pseudoplastic. This effect is related to the concentration and oxidation level of the obtained GO particles. The results obtained aim to contribute towards the understanding of the interactions between the GO and the polymeric liquid matrix, and their influence on the suspension rheological behavior.

show abstract

Colloidal and rheological behavior of aqueous graphene oxide dispersions in the presence of poly(ethylene glycol)

Cited by 30 publications

References 38 publications

Fabrication and characterization of graphene oxide modified polycarboxylic by in situ polymerization

Fabrication and characterization of graphene oxide modified polycarboxylic by in situ polymerization

Strengthening mechanism of poly(acrylamide)/graphene oxide/laponite dual nanocomposite hydrogels

Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(ethylene glycol) Suspensions

Contact Info

Product

Resources

About