Highly conductive polyimide nanocomposite prepared using a graphene oxide liquid crystal scaffold

Cho, Kyeong Min; So, Yujin; Choi, Seung Eun; Kwon, Ohchan; Park, Hyunjin; Won, Jong Chan; Kim, Hanim; Jung, Hee Tae; Kim, Yun Ho; Kim, Dae Woo

doi:10.1016/j.carbon.2020.07.051

Cited by 25 publications

(20 citation statements)

References 58 publications

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“…While the nematic LC phase has randomly oriented sheets in the suspension, shear force can be used to uniaxially orient the sheets. Due to the viscoelastic properties of the GO with the LC phase, shear force from the doctor blade casting aligned the GO sheets parallel to the casting direction 19 …”

Section: Resultsmentioning

confidence: 99%

“…This can be accomplished using a variety of processes, including solution melt blending, infiltration of the polymer into the graphene sheets, and in situ polymerization. Impregnating the polymer into the fabricated graphene scaffold is considered an effective method of controlling the alignment and chemical properties of graphene 13,14,19 …”

Section: Introductionmentioning

confidence: 99%

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Mechanically strong and highly ion conductive graphene oxide liquid crystal film containing the poly(amic acid) salt

Lee

Kim

et al. 2022

Intl J of Energy Research

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Summary Graphene oxide (GO) sheets can be aligned at low concentration to form a liquid crystal phase. Intriguingly, the poly(amic acid) salt (PAAS) can be used as an intercalated polymer in GO liquid crystal film. The PAAS is intercalated into the aligned GO sheets, increasing water absorbing capacity and reformatting hydrogen bonds in the GO. The suspensions for each content, observed by polarizing microscope, revealed a lyotropic liquid crystal nematic dispersion, even after PAAS was added. The mechanical strength of the GO films was improved by hydrogen bonding between the PAAS and GO sheets. The ultimate tensile strength (181 MPa) and modulus (222 MPa) of the reinforced film are tougher than pristine GO film, respectively. As such, interactions through the plane between the GO sheets and PAAS also improved the films' mechanical stability at high humidity. Functional groups of PAAS also improved the water absorbing capacity and flexibility of the water channels, improving ionic conductivity (0.67 S/cm). This is extraordinary to achieve high ionic conductivity by maintaining tensile strength. Therefore, GO/PAAS films are readily applicable for battery separator and fuel cell membranes. High tensile strength can prevent internal short circuit effectively only with 5 to 10μm of thickness. Highlights We introduce the poly(amic acid) salt as an intercalated polymer in graphene oxide liquid crystal film. poly(amic acid) salt can increase water absorbing capacity and reformat hydrogen bonds in the graphene oxide. The mechanical strength of the graphene oxide films was improved by hydrogen bonding between the PAAS and graphene oxide sheets. Increased water absorbing capacity and flexibility of the water channels improved ionic conductivity (0.67 S/cm).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanically strong and highly ion conductive graphene oxide liquid crystal film containing the poly(amic acid) salt

Lee

Kim

et al. 2022

Intl J of Energy Research

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“…The EDX mapping images show Zn and N atoms in the GONR layer, indicating the interlocked growth of the ZIF‐8 and GONR layers, possibly owing to the intercalation of the ZIF‐8 precursors into the GONR interlayer spacing. [ 26 ]…”

Section: Resultsmentioning

confidence: 99%

Pore Tuning of Metal‐Organic Framework Membrane Anchored on Graphene‐Oxide Nanoribbon

Choi

Kim

Choi

et al. 2021

Adv Funct Materials

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Although the pore structures and gas transport properties of metal‐organic frameworks (MOFs) have been tuned mainly by modifying the framework building blocks, a pore‐tuned zeolitic imidazolate framework (ZIF)‐8 layer is directly grown on graphene oxide nanoribbons (GONR)‐treated polymer substrate. Oxygen‐containing functional groups and GONR dangling‐carbon bonds facilitated the spontaneous growth of ZIF‐8 oriented to the (100) grain on the GONR surface and also enhanced the rigidity by strongly anchoring the ZIF‐8 layer by metal‐carbon chemisorption. Gas permeation and molecular simulation results confirmed that the effective aperture size of ZIF‐8 is adjusted to 3.6 Å. As a result, ultrafast H2 permeance of 7.6 × 10−7 mol m−2 Pa s is achieved while blocking large hydrocarbon molecules. In particular, the membrane showed exceptionally enhanced hydrogen selectivity for the mixture separation than ideal selectivity, owing to the competitive transport between H2 and large hydrocarbon molecules, and the separation performance surpassed those of ZIF membranes previously fabricated on polymeric supports.

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“…In fact, highly thermally conductive graphene is frequently used to enhance the thermal conductivity of PMCs [ 9 , 34 ]. As a derivative of graphene, graphene oxide (GO) can form liquid crystals (LCs), which can be precisely organized into 3D ordered microstructures by self-assembly of their building blocks [ 35 – 37 ]. Although highly aligned architectures are conducive to the thermal conductivity enhancement of polymer composites, their anisotropy easily results in severely weak thermal conductive performance in the direction perpendicular to the orientation of the filler network [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Spider Web-Inspired Graphene Skeleton-Based High Thermal Conductivity Phase Change Nanocomposites for Battery Thermal Management

et al. 2021

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Phase change materials (PCMs) can be used for efficient thermal energy harvesting, which has great potential for cost-effective thermal management and energy storage. However, the low intrinsic thermal conductivity of polymeric PCMs is a bottleneck for fast and efficient heat harvesting. Simultaneously, it is also a challenge to achieve a high thermal conductivity for phase change nanocomposites at low filler loading. Although constructing a three-dimensional (3D) thermally conductive network within PCMs can address these problems, the anisotropy of the 3D framework usually leads to poor thermal conductivity in the direction perpendicular to the alignment of fillers. Inspired by the interlaced structure of spider webs in nature, this study reports a new strategy for fabricating highly thermally conductive phase change composites (sw-GS/PW) with a 3D spider web (sw)-like structured graphene skeleton (GS) by hydrothermal reaction, radial freeze-casting and vacuum impregnation in paraffin wax (PW). The results show that the sw-GS hardly affected the phase transformation behavior of PW at low loading. Especially, sw-GS/PW exhibits both high cross-plane and in-plane thermal conductivity enhancements of ~ 1260% and ~ 840%, respectively, at an ultra-low filler loading of 2.25 vol.%. The thermal infrared results also demonstrate that sw-GS/PW possessed promising applications in battery thermal management.

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Highly conductive polyimide nanocomposite prepared using a graphene oxide liquid crystal scaffold

Cited by 25 publications

References 58 publications

Mechanically strong and highly ion conductive graphene oxide liquid crystal film containing the poly(amic acid) salt

Mechanically strong and highly ion conductive graphene oxide liquid crystal film containing the poly(amic acid) salt

Pore Tuning of Metal‐Organic Framework Membrane Anchored on Graphene‐Oxide Nanoribbon

Spider Web-Inspired Graphene Skeleton-Based High Thermal Conductivity Phase Change Nanocomposites for Battery Thermal Management

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