Ultralight graphene/graphite hybrid fibers via entirely water-based processes and their application to density-controlled, high performance composites

Zamani, Somayeh; Won, Joong Sun; Salim, Muhammad; AlAmer, Mohammed; Chang, Che‐Wei; Kumar, Pardeep; Amponsah, Kwame; Lim, Ae Ran; Joo, Yong Lak

doi:10.1016/j.carbon.2020.11.079

Cited by 8 publications

(10 citation statements)

References 28 publications

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“…As we have previously reported, the morphology and composition of the GFs is dependent on the initial graphite dispersion composition input into the TCR, TCR run parameters, centrifugation parameters, and wet‐spinning and washing parameters of the GFs [ 21 ] —wherein the fabrication methodology of the EG/FLG dispersion described above produces an EG:FLG ratio of ≈5:1 within the solution. [ 20 ] Additionally, NG exfoliated under these conditions results in structural homogeneity in the synthesized EG and FLG, wherein their stacking structure is maintained while the interlayer spacing is increased from 3.34 Å to ≈3.40 Å, as we have shown prior.…”

Section: Resultsmentioning

confidence: 99%

“…The fiber dimensions are determined by two factors, the drawing force ratio and the thickness of the spinning needle. [ 21 ] The parameters we use herein for wet‐spinning result in a fiber diameter ranging between 100–150 µm (Figure 6). This is consistent between the fibers as‐made and dried, and after cycling to 110 °C to simulate the possible conditioning occurring during conductivity measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The good graphene/graphite alignment and compactness is a result of the uniaxial flow, shear effects, and coagulation processes occurring during wet‐spinning process, as we have previously reported. [ 21 ] This good alignment has been shown to result in increased properties of GFs, including thermal and electrical conductivity, as well as mechanical properties. [ 21 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 21 ] This good alignment has been shown to result in increased properties of GFs, including thermal and electrical conductivity, as well as mechanical properties. [ 21 ]…”

Section: Resultsmentioning

confidence: 99%

“…The few-layer graphene (FLG) and expanded graphite (EG) at the center of our fabrication process were produced through a modified bulk-scale Taylor-Couette Reactor (TCR)-utilizing high shear rates to exfoliate graphite in an aqueous solution, as detailed in our previous publications. [19][20][21] The process flow used to fabricate the GFs is outlined in Figure 1. This method enables precise control of each initial component in the material's composition.…”

Section: Production Of Eg/flgmentioning

confidence: 99%

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Thermoresponsive Conductivity of Graphene‐Based Fibers

Salim

Vasudevan

Schulman

et al. 2023

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Smart materials are versatile material systems which exhibit a measurable response to external stimuli. Recently, smart material systems have been developed which incorporate graphene in order to share on its various advantageous properties, such as mechanical strength, electrical conductivity, and thermal conductivity as well as to achieve unique stimuli‐dependent responses. Here, a graphene fiber‐based smart material that exhibits reversible electrical conductivity switching at a relatively low temperature (60 °C), is reported. Using molecular dynamics (MD) simulation and density functional theory‐based non‐equilibrium Green's function (DFT‐NEGF) approach, it is revealed that this thermo‐response behavior is due to the change in configuration of amphiphilic triblock dispersant molecules occurring in the graphene fiber during heating or cooling. These conformational changes alter the total number of graphene‐graphene contacts within the composite material system, and thus the electrical conductivity as well. Additionally, this graphene fiber fabrication approach uses a scalable, facile, water‐based method, that makes it easy to modify material composition ratios. In all, this work represents an important step forward to enable complete functional tuning of graphene‐based smart materials at the nanoscale while increasing commercialization viability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…[ 21 ] This good alignment has been shown to result in increased properties of GFs, including thermal and electrical conductivity, as well as mechanical properties. [ 21 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Production Of Eg/flgmentioning

confidence: 99%

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Thermoresponsive Conductivity of Graphene‐Based Fibers

Salim

Vasudevan

Schulman

et al. 2023

Small

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Effect of tension and high-temperature on structural evolution of graphene oxide fibers of electrical conductivity

Ni,

Xu,

Duan

et al. 2024

Materials Today Communications

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Facile Synthesis of a Graphene Film with Ultrahigh Thermal Conductivity via a Novel Pressure-Swing Hot-Pressing Method

Li,

Peng,

zheng

et al. 2024

Ind. Eng. Chem. Res.

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A graphene film with high thermal conductivity and flexibility is highly demanded for heat dissipation application yet is still restricted by the complex and uneconomical fabrication process. Here, a facile and low-cost pressure-swing approach was adopted to realize the hot-pressing process of the graphene film. Accompanied by this pressureswing hot-pressing process, the gas emission behavior was found to be crucial to the reduction of the graphene film. In this context, the applied pressure was adjusted to achieve the order and dense structure of the graphene film. The as-prepared graphene film thus presents a high thermal conductivity of 1451.37 W m −1 K −1 and a tensile strength of 175 MPa. Concomitantly, the heating rate was further retarded to slow the decomposition of functional groups on the graphene oxide film. The optimized graphene film exhibits a thermal conductivity of 1516.74 W m −1 K −1 . Our results provide a highly promising method for preparing industrial-desired graphene films with high thermal conductivity.

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Ultralight graphene/graphite hybrid fibers via entirely water-based processes and their application to density-controlled, high performance composites

Cited by 8 publications

References 28 publications

Thermoresponsive Conductivity of Graphene‐Based Fibers

Thermoresponsive Conductivity of Graphene‐Based Fibers

Effect of tension and high-temperature on structural evolution of graphene oxide fibers of electrical conductivity

Facile Synthesis of a Graphene Film with Ultrahigh Thermal Conductivity via a Novel Pressure-Swing Hot-Pressing Method

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