Treatment of Atmospheric-Pressure Radio Frequency Plasma on Boron Nitride for Improving Thermal Conductivity of Polydimethylsiloxane Composites

Kim, Yeongseon; Hwang, Sosan; So, Jae Il; Kim, Chae Lin; Kim, Minjae; Shim, Sang Eun

doi:10.1007/s13233-018-6120-2

Cited by 22 publications

(11 citation statements)

References 21 publications

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“…5 Although this makes breakage of B−N bonds challenging, several chemical modification strategies have still been developed successfully. 7,8 In general, most of them rely on strong acids, 9 strong bases, 10,11 strong oxidants, 12 highenergy rays, 13,14 or other harsh experimental conditions. 15 For example, adding h-BN to HNO 3 (or a mixed solution of HNO 3 and H 2 SO 4 ) solution (∼65% w/w) and sonicating for 5−6 h can introduce hydroxyl groups on the surface.…”

Section: ■ Introductionmentioning

confidence: 99%

Thionyl Chloride Corrodes Hexagonal Boron Nitride to Generate Reactive Functional Groups

2021

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Two-dimensional hexagonal boron nitride (h-BN) has received much attention owing to its unique properties and wide range of applications. However, the lack of sufficient active functional groups on the surface coupled with the extremely stable structure restricts the wide application of h-BN. We find that thionyl chloride can corrode commercially available h-BN and generate many through-holes in the thickness direction. Both X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT-IR) show that the corroded h-BN contains reactive hydroxyl and a lot of amino groups. The corrosion mechanism is proposed and we conclude that H+ and OH– will affect the defect structure of the corroded h-BN by affecting the generation of boric acid. The thionyl chloride corroded h-BN could improve the thermal conductivity and DC breakdown strength of the composites because of the improved interface. This novel method about corroding h-BN through thionyl chloride is promising for the modification research of h-BN due to its simplicity and efficiency.

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Section: ■ Introductionmentioning

confidence: 99%

Thionyl Chloride Corrodes Hexagonal Boron Nitride to Generate Reactive Functional Groups

2021

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“…Following the surface modification, the spectrum of the APTS‐BNNSs exhibits substantial changes from that of the OH‐BNNSs. The new absorption peaks at 2925, 1037, and 987 cm −1 in the APTS‐BNNSs can be ascribed to the presence of C‐H stretching vibration of the ‐CH 2 ‐ groups and the Si‐O stretching, suggesting that the silane coupling agent APTS is linked on the h‐BNNSs . Furthermore, the intensity of the broad absorption band around 3400 cm −1 reduces remarkably, which is related to the reaction of the ethoxy groups of the APTS with the hydroxyl groups on the surface of h‐BNNSs through covalent attachment .…”

Section: Resultsmentioning

confidence: 91%

Covalent Functionalized Boron Nitride Nanosheets as Efficient Lubricant Oil Additives

Wang

Han

et al. 2019

Adv Materials Inter

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Hexagonal boron nitride nanosheets (h‐BNNSs) are obtained by a chemical exfoliation method from bulk h‐BN powders. The surface of h‐BNNSs is functionalized with 3‐aminopropyltriethoxysilane (APTS). Further, the amino functional groups on the surface of APTS‐modified h‐BNNSs (APTS‐BNNSs) are reacted with 4‐carboxyphenylboronic acid (CPBA) to obtain the covalently linked CPBA‐BNNSs. The morphology and structure of h‐BNNSs, APTS‐BNNSs, and CPBA‐BNNSs are comprehensively discussed. Of all the above four additives, the CPBA‐BNNSs can most outstandingly improve friction‐reducing and antiwear capacities of 150N base oil. The CPBA‐BNNSs possess excellent dispersion stability in base oil due to the phenylboronic acid groups on the surface of h‐BNNSs. Only 0.075 wt% CPBA‐BNNSs is added into the base oil, the coefficient of friction is decreased by 32.3%, and the wear scar diameter and mean wear volume of the rubbing surface are reduced by 42.9% and 88.4%. The analysis of the worn scar surface demonstrates that CPBA‐BNNSs can form a protective tribofilm containing boron and nitrogen elements on the rubbing surfaces, thereby decreasing the friction and protecting the surfaces from wear. Thus, the CPBA‐BNNSs may be recommended as a potential lubricant additive in practical applications.

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“…At present, the main method to improve the dispersion of nanoparticles is surface modification of nanoparticles, and silane coupling agent (SCA) is a commonly used surface modifier [13]. However, the surface of BN has a small content of -OH groups [14], and the bonding degree between BN and SCA is low, so it is necessary to hydroxylate the surface first. The methods for surface hydroxylation modification of BN mainly include high temperature annealing [15], NaOH heat treatment [16], H 2 O 2 heat treatment [17], and concentrated mixed acid treatment [18].…”

Section: Introductionmentioning

confidence: 99%

“…Guangning Wu et al [19] modified nano-Al 2 O 3 with atmospheric pressure air plasma excited by high frequency AC power, and effectively increased the hydroxyl content on the surface of Al 2 O 3 . Yeongseon Kim et al [14] used atmospheric pressure RF plasma to modify BN and successfully introduced hydroxyl groups on the BN surface, which enhanced the binding degree of BN and SCA. Thus, a high-frequency AC source is currently used to hydroxylate nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Breakdown Strength and Thermal Conductivity of BN/EP Nanocomposites with Bipolar Nanosecond Pulse DBD Plasma Modified BNNSs

Gou

Liu

et al. 2019

Nanomaterials

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Filling epoxy resin (EP) with boron nitride (BN) nanosheets (BNNSs) can effectively improve the thermal conductivity of BN/EP nanocomposites. However, due to the few hydroxyl groups on the surface of BNNSs, silane coupling agent (SCA) cannot effectively modify BNNSs. The agglomeration of BNNSs is severe, which significantly reduces the AC breakdown strength of the composites. Therefore, this paper uses atmospheric pressure bipolar nanosecond pulse dielectric barrier discharge (DBD) Ar+H2O low temperature plasma to hydroxylate BNNSs to improve the AC breakdown strength and thermal conductivity of the composites. X-ray photoelectron spectroscopy (XPS) shows that the hydroxyl content of the BNNSs surface increases nearly two fold after plasma modification. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) show that plasma modification enhances the dehydration condensation reaction of BNNSs with SCA, and the coating amount of SCA on the BNNSs surface increases by 45%. The breakdown test shows that the AC breakdown strength of the composites after plasma modification is improved under different filling contents. With the filling content of BNNSs increasing from 10% to 20%, the composites can maintain a certain insulation strength. Meanwhile, the thermal conductivity of the composites increases by 67% as the filling content increases from 10% (SCA treated) to 20% (plasma and SCA treated). Therefore, the plasma hydroxylation modification method used in this paper can provide a basis for the preparation of high thermal conductivity insulating materials.

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Treatment of Atmospheric-Pressure Radio Frequency Plasma on Boron Nitride for Improving Thermal Conductivity of Polydimethylsiloxane Composites

Cited by 22 publications

References 21 publications

Thionyl Chloride Corrodes Hexagonal Boron Nitride to Generate Reactive Functional Groups

Thionyl Chloride Corrodes Hexagonal Boron Nitride to Generate Reactive Functional Groups

Covalent Functionalized Boron Nitride Nanosheets as Efficient Lubricant Oil Additives

Enhanced Breakdown Strength and Thermal Conductivity of BN/EP Nanocomposites with Bipolar Nanosecond Pulse DBD Plasma Modified BNNSs

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