Field-induced stretching and dynamic reorientation of functionalized multiwalled carbon nanotube aggregates in nematic liquid crystals

Tie, Weiwei; Bhattacharyya, S. P.; Zhang, Yange; Zheng, Zhi; Lee, Tae Hoon; Lee, Sang Won; Kim, Tae Hyung; Lee, Young Hee; Lee, Seung Hee

doi:10.1016/j.carbon.2015.09.096

Cited by 16 publications

(3 citation statements)

References 37 publications

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“…The absorption bands at 2922 and 2848 cm −1 correspond to the asymmetric and symmetric stretching vibration modes of the -CH 2groups, respectively. 28 In general, the C-O vibrations occur in the region 1000-1260 cm −1 , and the absorbance band at 1085 cm −1 should be assigned the C-O stretching vibrations. 29 The absorption bands in the region 1420-1500 cm −1 should be ascribed to the C-C stretching vibrations.…”

Section: Structural Characterization Of Ultrathin β-Co(oh) 2 Nanosheetsmentioning

confidence: 99%

Few layered Co(OH)₂ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

2016

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Section: Structural Characterization Of Ultrathin β-Co(oh) 2 Nanosheetsmentioning

confidence: 99%

Few layered Co(OH)₂ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

2016

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“…The research results showed that the orientation of carbon nanotubes in liquid crystal affects the conductivity of materials. Tie et al [ 22 ] showed that carbon nanotubes have a significant electrical stretching behavior in nematic liquid crystals under a specific electric field. The stretched carbon nanotubes were arranged along the direction of the electric field and can be reoriented by the anisotropic mutual guidance of nematic liquid crystal.…”

Section: Introductionmentioning

confidence: 99%

Study on preparation and field induction mechanism of organic silicon composites based on aligned carbon nanotubes

Liu

Zhou

et al. 2022

Polymer Engineering & Sci

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High thermal conductivity materials are an urgent need for high power, microelectronic components and equipment, but are limited by low thermal conductivity of the traditional silicone materials. 4‐Cyano‐4′‐n‐octyl biphenyl (8OCB) was synthesized to modify carbon nanotubes, and silicone was used as the matrix. In the curing process of the composite, an electric field was applied and the liquid crystal induced the orientation of carbon nanotubes in the direction of 8OCB liquid crystal. The morphology, structure and properties of modified carbon nanotubes and composites were characterized by Fourier transform infrared spectroscopy, polarized microscopy, transmission electron microscopy, thermal conductivity, and so on. The 8OCB liquid crystal can improve the dispersion of carbon nanotubes in silicone composites. When the mass fraction of multiwalled carbon nanotubes (MWCNTs) was 11 wt%, the thermal conductivity of 8OCB‐MWCNTs/silicone composite after electric field was 2.39 W/(m K), which is 6.4 times that of MWCNTs/silicone composite after electric field and 15.5 times that of pure silicone matrix. A method to obtain highly ordered filled thermal conductive materials by applying an electric field to induce the orientation of carbon nanotubes is demonstrated.

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“…It has been presented that the surface energy of MWCNT can be reduced by adding surfactant or surface modification methods [25][26][27]. The surfactant reduces the surface energy of MWCNT, and thus the MWCNT-aggregates are restrained.…”

Section: Introductionmentioning

confidence: 99%

Influences of nickel plated multi-walled carbon-nanotube on the electro-optical properties of nematic liquid crystal

Guo

et al. 2019

Nanotechnology

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Some enhanced performances can be obtained by doping multi-walled carbon-nanotube (MWCNT) into self-organized nematic liquid crystal (NLC). However, the dispersion of MWCNT in NLC is very few, thus the enhancement is restricted. In this work, a nickel plated MWCNT (MWCNT@Ni) is synthesized to obtain a relatively high dispersion. The morphology, element and chemical bond differences between MWCNT and MWCNT@Ni are characterized. For MWCNT@Ni, there is a layer of coaxial nickel coated on the surface of MWCNT, which weakens the interaction energy between the adjacent MWCNTs and further results in a relatively high dispersion. Moreover, MWCNT@Ni has a more orderly arrangement in NLC compared with MWCNT. The results suggest that the dielectric anisotropy of MWCNT@Ni/NLC with mass fraction of 0.01 wt% is increased by ∼3.6%, and the saturation voltage is reduced by ∼7.3%. Besides, the rise time is decreased by ∼9.5% at 5 V and 1 kHz. These performances have been improved compared with MWCNT/NLC under the same mass fraction. The effect of mass fraction of MWCNT@Ni on rise time is further investigated. As a result, the rise time is decreased by ∼16.7% as MWCNT@Ni with mass fraction of 0.10 wt% is added into NLC. In general, the method to increase dispersion of dopant in NLC is proposed, which can serve as a reference to improve the performances of NLC composites.

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Field-induced stretching and dynamic reorientation of functionalized multiwalled carbon nanotube aggregates in nematic liquid crystals

Cited by 16 publications

References 37 publications

Few layered Co(OH)₂ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

Few layered Co(OH)₂ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

Study on preparation and field induction mechanism of organic silicon composites based on aligned carbon nanotubes

Influences of nickel plated multi-walled carbon-nanotube on the electro-optical properties of nematic liquid crystal

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Field-induced stretching and dynamic reorientation of functionalized multiwalled carbon nanotube aggregates in nematic liquid crystals

Cited by 16 publications

References 37 publications

Few layered Co(OH)2ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

Few layered Co(OH)2ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

Study on preparation and field induction mechanism of organic silicon composites based on aligned carbon nanotubes

Influences of nickel plated multi-walled carbon-nanotube on the electro-optical properties of nematic liquid crystal

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Product

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Few layered Co(OH)₂ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling

Few layered Co(OH)₂ultrathin nanosheet-based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling