Electrostabilized homogeneous dispersion of boron nitride nanotubes in wide-range of solvents achieved by surface polarity modulation through pyridine attachment

Chang, M.-S.; Jang, Min-Sun; Yang, Sangsun; Yu, Juan; Kim, Tae-Hoon; Kim, Sedong; Jeong, Hyomin; Park, Chong Rae; Jeong, Jae Won

doi:10.1007/s12274-019-2612-4

Cited by 12 publications

(11 citation statements)

References 37 publications

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“…While the Hansen dispersion and hydrogen bonding solubility parameters of both BNNTs [ 21 ] and PDMS [ 20 ] are similar, the difference in their Hansen solubility polar parameters prevents BNNTs from dispersing in PDMS. Furthermore, conventional methods to overcome chemical incompatibility including sonication [ 11 ] and functionalization [ 22 ] could potentially damage BNNTs by covalently modifying the tube surface and/or shortening the tube length, possibly impacting tube thermal conductivity and piezoelectricity which rely on the unperturbed molecular structure of pristine BNNTs. As a result, the primary challenge preventing the development of stretchable BNNT/PDMS composites is the difficulty in integrating BNNTs into PDMS without compromising functionality.…”

Section: Figurementioning

confidence: 99%

Tunable Piezoelectricity of Multifunctional Boron Nitride Nanotube/Poly(dimethylsiloxane) Stretchable Composites

et al. 2020

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Multifunctional piezoelectric materials with controllable mechanical and thermal properties could enable the next generation of soft interconnect materials, energy harvesters, and health monitors. [1] Boron nitride nanotubes (BNNTs) possess unique properties that have piqued the interest of the broader research community as the basis for these multifunctional materials. [2] BNNTs exhibit high mechanical strength, possessing a Young's modulus (Y) as high as 1.3 TPa [3] which outperforms most structural materials. BNNTs also show enhanced thermal properties including extreme thermal stability in air (>800 °C) [4] and thermal conductivity competitive with carbon nanotubes (CNT) [5] which, when combined with their electrically insulating nature, may enable the development of novel thermally conductive, electrically insulating materials. [6] Of particular interest are BNNTs' piezoelectric properties, [7] arising from polarization due to the electronegativity difference between boron and nitrogen atoms, which is predicted to result in the generation of a coupled electric dipole in response to deformation. [8] With the advent of techniques to produce large volumes of BNNTs such as the high temperature pressure (HTP) method, [9,10] interest has shifted to production of ensembles of BNNTs which translate the nanoscale properties of BNNTs to macroscale systems. The most widely employed technique to produce functional structures of BNNTs is suspension in a matrix material to form a functional composite. For instance, the dispersion of BNNTs in soft polymers has been shown to augment mechanical properties, nearly doubling the compressive modulus of polyurethane. [11] Similarly, BNNTs can be added to thermally insulating materials to enhance thermal conductivity, with addition of BNNTs to polymer-derived ceramic (PDC) enhancing thermal conductivity by 2100%. [12] Most saliently, BNNT/polymer composites represent the first realization of BNNT piezoelectricity at the macroscale. Polyimide composites containing strainaligned BNNTs demonstrate piezoelectric coefficients up to 4.81 pm V −1 , [13] and nanoporous BNNT thin films are predicted to possess piezoelectric responses competitive with commercial piezoelectric polymers. [14] Of particular interest are stretchable BNNT composites which are optimal for use as flexible thermal interconnects [15] and platforms for strain aligning nanotubes [16] Boron nitride nanotubes (BNNT) uniformly dispersed in stretchable materials, such as poly(dimethylsiloxane) (PDMS), could create the next generation of composites with augmented mechanical, thermal, and piezoelectric characteristics. This work reports tunable piezoelectricity of multifunctional BNNT/PDMS stretchable composites prepared via co-solvent blending with tetrahydrofuran (THF) to disperse BNNTs in PDMS while avoiding sonication or functionalization. The resultant stretchable BNNT/PDMS composites demonstrate augmented Young's modulus (200% increase at 9 wt% BNNT) and thermal conductivity (120% increase at 9 wt% BNNT) without losin...

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Section: Figurementioning

confidence: 99%

Tunable Piezoelectricity of Multifunctional Boron Nitride Nanotube/Poly(dimethylsiloxane) Stretchable Composites

et al. 2020

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“…Considering that research on photoexcitation-controlled materials is still in its infancy, − we selected the typical persulfurated aromatic molecule − (compound 1 , Figure A) as the prototype to explore the dependency of molecular conformation of ground and excited states on the solubility in organic solvents and to explore the possibility to obtain photoexcitation-controlled AIE with interference factors minimized (Figure B). We studied the photoexcitation-controlled AIE behavior of this compound in organic solvents (Figure C), with a consideration of different physical and chemical factors regarding the intensity of light, dissolved oxygen content, and solvent polarity . In order to better overwhelm the impact of solvent-induced photooxidation or other side-reactions under the excitation of light, , an organogel capable of photoexcitation-controlled AIEgens was also developed and applied as an illustration.…”

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confidence: 99%

“…We studied the photoexcitationcontrolled AIE behavior of this compound in organic solvents (Figure 1C), with a consideration of different physical and chemical factors regarding the intensity of light, dissolved oxygen content, 46 and solvent polarity. 47 In order to better overwhelm the impact of solvent-induced photooxidation or other side-reactions under the excitation of light, 48,49 an organogel capable of photoexcitation-controlled AIEgens was also developed and applied as an illustration.…”

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confidence: 99%

Enhancing the Operability of Photoexcitation-Controlled Aggregation-Induced Emissive Molecules in the Organic Phase

Weng

Zou

Zhang

et al. 2021

J. Phys. Chem. Lett.

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Controllable aggregation-induced emission luminogens (AIEgens) by photoexcitation can be conducted within a single solvent, thus opening new opportunities for preparing and processing smart materials. However, undesired side-reactions like photooxidation that can easily occur in the organic phase remain, limiting their applications. To enhance the operability of photoexcitation-controlled AIEgens (to specifically produce a phosphorescence characteristic) in the organic phase, in this work, we employ a typical prototype, hexathiobenzene, usually as the specific phosphorescent group, and investigate a series of physical and chemical factors, such as light intensity, dissolved oxygen content, and solvent polarity, to explore ways to control the photoexcitation-controllable AIEgens against the impurities from side-reactions. An organogel strategy was also developed to minimize interference factors and improve the practical application ability. We believe that the presented results provide new insights into the further development of the photoexcitationbased functional materials and the promotion of their practical usage.

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“…One notable approach is to utilize the Lewis acid-base interaction: affinity of the electron-rich N (or phosphorus) atoms of functional moieties (i.e., Lewis bases) toward the electron-poor B atoms in BN lattices (i.e., Lewis acids) [30][31][32]. Recently, pyridine with Lewis base character was shown to serve as a good BNNT dispersant, effective in a wide range of solvents [33]. For instance, pyridine-contained poly(4vinylpyridine) (P4VP) polymers have shown great promise to functionalize and disperse BNNTs whereby separating BNNTs from hBN sheets, though impurities less than 100 nm remained unseparated [34,35].…”

Section: Invited Papermentioning

confidence: 99%

Poly(4-vinylpyridine) adsorption on boron nitride nanotubes and hexagonal boron nitride: A comparative molecular dynamics study

Shin

Yeverovich

2022

Journal of Materials Research

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One of the foremost challenges in the boron nitride nanotube (BNNT) community is selective separation of BNNTs from the as-produced mixture of various hexagonal BN (hBN) phases. Recently, a polymer with a pyridine group, poly(4-vinylpyridine) (P4VP) has proven to be effective for BNNT dispersion. Here, we performed all-atom molecular dynamics simulations to elucidate the selective dispersion mechanism by characterizing interfacial interactions of P4VP with 12 different types of BNNTs, as well as with 8 different sizes of hBN sheets. The results revealed a prominent effect of lattice curvature (i.e., tube diameter) and morphology (i.e., tubular or planar) on the polymer adsorption conformation and their binding energetics. Remarkably, P4VP tightly wrapped around BNNTs with a well-defined helical pitch, while it formed an extended random coil on planar hBNs. A comparative study on carbon nanotubes and graphenes also highlighted the critical role of electrostatic interaction of P4VP with partially charged BN lattice. Graphical abstract

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Electrostabilized homogeneous dispersion of boron nitride nanotubes in wide-range of solvents achieved by surface polarity modulation through pyridine attachment

Cited by 12 publications

References 37 publications

Tunable Piezoelectricity of Multifunctional Boron Nitride Nanotube/Poly(dimethylsiloxane) Stretchable Composites

Tunable Piezoelectricity of Multifunctional Boron Nitride Nanotube/Poly(dimethylsiloxane) Stretchable Composites

Enhancing the Operability of Photoexcitation-Controlled Aggregation-Induced Emissive Molecules in the Organic Phase

Poly(4-vinylpyridine) adsorption on boron nitride nanotubes and hexagonal boron nitride: A comparative molecular dynamics study

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