Long-Term High-Temperature Stability of Functionalized Graphene Oxide Nanoplatelets in Arab-D and API Brine

Zúñiga, Carlos; Goods, John B.; Cox, Jason R.; Swager, Timothy M.

doi:10.1021/acsami.5b09656

Cited by 35 publications

(37 citation statements)

References 20 publications

(42 reference statements)

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“…Therefore, the mechanical strength and stability of GO lm can be enhanced when graphene oxide is modied by crosslinkers 26,27,33,34 or incorporated into polymer matrix. 30 Further, it is found that the incorporation of GO into polymer matrix membranes can improve obviously water permeation, 35 antifouling 36 and salt rejection 37 in desalination.…”

Section: -32mentioning

confidence: 99%

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Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

Feng

Huang

2017

RSC Adv.

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Nanohybrid graphene oxide (GO)/polyimide (PI) mixed matrix membranes (MMMs) were prepared by dispersing GO into PI through wet phase inversion method. The structure of GO/PI MMMs was characterized by using XRD, FT-IR and XPS. FESEM was used to analyze the morphology of the GO/PI MMMs. The hydrophilicity of the GO/PI MMMs was determined by static water contact angles. The performances of the GO/PI MMMs were evaluated for desalination of seawater through pervaporation.The GO/PI MMMs display excellent water permeability and salt rejection for desalination of different concentrations of seawater. At 90 C, the GO/PI MMMs exhibit a high water flux (36.1 kg m À2 h À1) and a high salt rejection (99.9%). Further, the GO/PI MMM displays a high stability for seawater desalination.This high separation performance combined with high stability and facile fabrication route recommend the developed GO/PI MMMs as a promising candidate for desalination of seawater.

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Section: -32mentioning

confidence: 99%

“…33,40 The resulting GO aqueous dispersion was sonicated for 30 min followed by centrifugation at 8000 rpm for 30 min to remove the unoxidized graphite. And then, the GO powder was obtained by freeze drying overnight.…”

Section: Preparation Of Go Nanosheets and Go/pi Mmmsmentioning

confidence: 99%

Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

Feng

Huang

2017

RSC Adv.

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“…wedge-film disjoining and Pickering emulsion formation) may be used to mobilize residual oil given the correct tailoring of the nanomaterial chemistry and concentration. Unfortunately, harsh subsurface environments with high salinity (>120 000 ppm of total dissolved solids) and often elevated temperatures (>100 °C) impose great engineering challenges for the applications for nanomaterials in these conditions 17–26 . Specifically, the colloidal stability of nanomaterials is largely compromised by excessive charge screening and subsequent loss of electrostatic repulsion at the high salinities 3,4,24–26 .…”

Section: Introductionmentioning

confidence: 99%

Understanding Calcium-Mediated Adhesion of Nanomaterials in Reservoir Fluids by Insights from Molecular Dynamics Simulations

Chen

Eichmann

Burnham

2019

Sci Rep

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Interest in nanomaterials for subsurface applications has grown markedly due to their successful application in a variety of disciplines, such as biotechnology and medicine. Nevertheless, nanotechnology application in the petroleum industry presents greater challenges to implementation because of the harsh conditions (i.e. high temperature, high pressure, and high salinity) that exist in the subsurface that far exceed those present in biological applications. The most common subsurface nanomaterial failures include colloidal instability (aggregation) and sticking to mineral surfaces (irreversible retention). We previously reported an atomic force microscopy (AFM) study on the calcium-mediated adhesion of nanomaterials in reservoir fluids (S. L. Eichmann and N. A. Burnham, Sci. Rep . 7, 11613, 2017), where we discovered that the functionalized and bare AFM tips showed mitigated adhesion forces in calcium ion rich fluids. Herein, molecular dynamics reveal the molecular-level details in the AFM experiments. Special attention was given to the carboxylate-functionalized AFM tips because of their prominent ion-specific effects. The simulation results unambiguously demonstrated that in calcium ion rich fluids, the strong carboxylate-calcium ion complexes prevented direct carboxylate-calcite interactions, thus lowering the AFM adhesion forces. We performed the force measurement simulations on five representative calcite crystallographic surfaces and observed that the adhesion forces were about two to three fold higher in the calcium ion deficient fluids compared to the calcium ion rich fluids for all calcite surfaces. Moreover, in calcium ion deficient fluids, the adhesion forces were significantly stronger on the calcite surfaces with higher calcium ion exposures. This indicated that the interactions between the functionalized AFM tips and the calcite surfaces were mainly through carboxylate interactions with the calcium ions on calcite surfaces. Finally, when analyzing the order parameters of the tethered functional groups, we observed significantly different behavior of the alkanethiols depending on the absence or presence of calcium ions. These observations agreed well with AFM experiments and provided new insights for the competing carboxylate/calcite/calcium ion interactions.

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“…[18][19][20] The presence of free ions shielded the mutual attraction between inner chains in molecules and enhanced the bonding of molecules to each other, so that with an increasing hydrodynamic volume, the molecular conformation became more stretched, resulting in an increase in viscosity instead of falling. 21,22 Zuniga C. A. et al 23 obtained a novel system, I-prGO, on the partially reduced graphene oxide functionalized sulfonate-based zwitterionic polymer poly(vinylimidazole)-co-poly(aminostyrene), which could be used as a carrier for molecular delivery and as a protective inclusion of nanomaterials, and also for reservoir mapping and enhanced oil recovery. For example, the copolymer exhibited a highly stable dispersion aer 140 days at 90 C in high concentrations of Arab-D and API from deep reservoirs.…”

Section: Introductionmentioning

confidence: 99%