Continuous Synthesis of Structurally Uniform Graphene Oxide Materials in a Model Taylor–Couette Flow Reactor

AlAmer, Mohammed; Lim, Ae Ran; Joo, Yong Lak

doi:10.1021/acs.iecr.8b04428

Cited by 18 publications

(18 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The photocatalytic degradation process for every drop of test solution was completed within less than 0.1 S. Notably, the disk was made of polycarbonate, which can be recycled from optical storage waste, making it environmentally beneficial. A Taylor vortex reactor [62][63][64][65][66][67][68][69] includes two cylinders that are arranged in symmetrically and can be oriented vertically (Figure 3a) or horizontally. Typically, the inner cylinder rotates at a high speed relative to the outer fixed cylinder.…”

Section: Types Of Reactors For Photocatalytic Reactionsmentioning

confidence: 99%

Review of Experimental Setups for Plasmonic Photocatalytic Reactions

Huang

Chiang

et al. 2019

Catalysts

View full text Add to dashboard Cite

Plasmonic photocatalytic reactions have been substantially developed. However, the mechanism underlying the enhancement of such reactions is confusing in relevant studies. The plasmonic enhancements of photocatalytic reactions are hard to identify by processing chemically or physically. This review discusses the noteworthy experimental setups or designs for reactors that process various energy transformation paths for enhancing plasmonic photocatalytic reactions. Specially designed experimental setups can help characterize near-field optical responses in inducing plasmons and transformation of light energy. Electrochemical measurements, dark-field imaging, spectral measurements, and matched coupling of wavevectors lead to further understanding of the mechanism underlying plasmonic enhancement. The discussions herein can provide valuable ideas for advanced future studies.

show abstract

Section: Types Of Reactors For Photocatalytic Reactionsmentioning

confidence: 99%

Review of Experimental Setups for Plasmonic Photocatalytic Reactions

Huang

Chiang

et al. 2019

Catalysts

View full text Add to dashboard Cite

show abstract

“…Further on semiconductors, a TCR was employed to study the oxidation of graphite flakes and obtain graphite oxide, a precursor to graphene oxide. In this setup, mixing of graphite and oxidizing agents was successfully achieved via Taylor vortices, which reportedly shortened the synthesis of graphite oxide from hours to minutes 145,146 . The treatment of multi-walled carbon nanotube composites was performed in turbulent TC flow, whereby the vortex flow was able to achieve a uniform dispersion of nanotubes.…”

Section: Crystallization and Solid Processingmentioning

confidence: 99%

“…Further on semiconductors, a TCR was used to study the oxidation of graphite flakes and obtain graphite oxide, a precursor to graphene oxide. In this setup, mixing of graphite and oxidizing agents was successfully achieved via Taylor vortices, which reportedly shortened the synthesis of graphite oxide from hours to minutes 145,146 . The synthesis of this material and the level of oxidation reached were tested under different hydrodynamic flow regimes: Couette flow, Taylor vortex flow, wavy vortex flow as well as the primary and secondary instabilities between these.…”

Section: Application Of the Tcr In Process Technologymentioning

confidence: 99%

“…The results by AlAmer show that at the Taylor vortex flow condition not only the degree of oxidation increased, but also structurally more uniform graphite oxide was obtained compared with the other flows, where these features were less favorable. These two properties render this material more advantageous toward applications like energy storage and catalysis 145 …”

Section: Application Of the Tcr In Process Technologymentioning

confidence: 99%

See 1 more Smart Citation

Taylor‐Couette reactor: Principles, design, and applications

et al. 2021

View full text Add to dashboard Cite

The Taylor-Couette reactor (TCR) is an apparatus that capitalizes on the Taylor-Couette flow, which allows many flow regimes and conditions to perform (bio-)chemical conversions with precise control of various reactor characteristics. With the possibility to continuously perfuse the reactor with a reaction medium, the TCR becomes interesting for chemical engineering applications. In this review we introduce this reactor type and provide an overview of its history, principles of the flow regimes, and a description and design aspects of the reactors and their elements. Available information in the literature is summarized and harmonized to present available formulas and correlations in a consistent set of variables. Additionally, a wide number of applications in process technology is covered, including reactions in homogeneous, photo and enzymatic catalysis, polymer synthesis, and crystallization and aggregation-flocculation processes. Focusing on this reactor configuration, this article intends to be used as a hub for scientific groups interested in TCRs. This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as

show abstract

“…Due to its invaluable properties, GO has been used in a wide In order to commercialize GO, developing a cost-effective synthes the bulk scale is essential. There are studies that modeled a Couett prove the GO synthesis process [16,17], where the mixture of an pension of GO and an additive was injected into the gap between inders.…”

Section: Introductionmentioning

confidence: 99%

Simulations of Graphene Oxide Dispersions as Discotic Nematic Liquid Crystals in Couette Flow Using Ericksen-Leslie (EL) Theory

Nikzad

Bhatia

Grecov

2022

Fluids

View full text Add to dashboard Cite

The objective of this study was to simulate the flow of graphene oxide (GO) dispersions, a discotic nematic liquid crystal (DNLC), using the Ericksen-Leslie (EL) theory. GO aqueous suspension, as a lubricant, effectively reduces the friction between solid surfaces. The geometry considered in this study was two cylinders with a small gap size, which is the preliminary geometry for journal bearings. The Leslie viscosity coefficients calculated in our previous study were used to calculate the stress tensor in the EL theory. The behavior of GO dispersions in the concentration range of 15 mg/mL to 30 mg/mL, shown in our recent experiments to be in the nematic phase, was investigated to obtain the orientation and the viscosity profile. The viscosities of GO dispersions obtained from numerical simulations were compared with those from our recent experimental study, and we observed that the values are within the range of experimental uncertainty. In addition, the alignment angles of GO dispersions at different concentrations were calculated numerically using EL theory and compared with the respective theoretical values, which were within 1% error. The anchoring angles corresponding to viscosity values closest to the experimental results were between 114 and 118 degrees. Moreover, a sensitivity analysis was performed to determine the effects of different ratios of the elasticity coefficients in EL theory. Using this procedure, the same study could be extended for other DNLCs in different geometries.

show abstract

Continuous Synthesis of Structurally Uniform Graphene Oxide Materials in a Model Taylor–Couette Flow Reactor

Cited by 18 publications

References 50 publications

Review of Experimental Setups for Plasmonic Photocatalytic Reactions

Review of Experimental Setups for Plasmonic Photocatalytic Reactions

Taylor‐Couette reactor: Principles, design, and applications

Simulations of Graphene Oxide Dispersions as Discotic Nematic Liquid Crystals in Couette Flow Using Ericksen-Leslie (EL) Theory

Contact Info

Product

Resources

About