Boron nitride aerogels consisting of varied superstructures

Pan, Jue; Wang, Jiemin

doi:10.1039/c9na00702d

Cited by 21 publications

(11 citation statements)

References 40 publications

(40 reference statements)

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“…The increment reaches a value of ~ 1203.7% for the 50/50 HA sample of its initial weight. These results show that the hBN induces a highly hydrophilic nature to the HAs, in agreement with recent experiments on the wettability properties of pure hBN aerogels 64 . In Tables 3 , 4 , 5 we present the initial weight of the samples before subjecting them to the gas or humid environment, as well their weight after drying for removing the absorbed gas/humidity.…”

Section: Resultssupporting

confidence: 92%

Multi-functional 2D hybrid aerogels for gas absorption applications

Androulidakis

Kotsidi

Gorgolis

et al. 2021

Sci Rep

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Aerogels have attracted significant attention recently due to their ultra-light weight porous structure, mechanical robustness, high electrical conductivity, facile scalability and their use as gas and oil absorbers. Herein, we examine the multi-functional properties of hybrid aerogels consisting of reduced graphene oxide (rGO) integrated with hexagonal boron nitride (hBN) platelets. Using a freeze-drying approach, hybrid aerogels are fabricated by simple mixing with various volume fractions of hBN and rGO up to 0.5/0.5 ratio. The fabrication method is simple, cost effective, scalable and can be extended to other 2D materials combinations. The hybrid rGO/hBN aerogels (HAs) are mechanically robust and highly compressible with mechanical properties similar to those of the pure rGO aerogel. We show that the presence of hBN in the HAs enhances the gas absorption capacities of formaldehyde and water vapour up to ~ 7 and > 8 times, respectively, as compared to pure rGO aerogel. Moreover, the samples show good recoverability, making them highly efficient materials for gas absorption applications and for the protection of artefacts such as paintings in storage facilities. Finally, even in the presence of large quantity of insulating hBN, the HAs are electrically conductive, extending the potential application spectrum of the proposed hybrids to the field of electro-thermal actuators. The work proposed here paves the way for the design and production of novel 2D materials combinations with tailored multi-functionalities suited for a large variety of modern applications.

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Section: Resultssupporting

confidence: 92%

Multi-functional 2D hybrid aerogels for gas absorption applications

Androulidakis

Kotsidi

Gorgolis

et al. 2021

Sci Rep

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“…As depicted in Figure 1, we used pure water and the mixture of water and tert-butyl alcohol (TBA) as different solvents for supramolecular precursor gels, the building molecules for which are melamine (M), acetoguanamine (M*), and boric acid (B), which could serve as raw materials for the fabrication of BN aerogel with complex inner structure, as described before (Pan and Wang, 2020). These three molecules at a fixed molar ratio (M: M*: B = 1:1:6) were dissolved in solvents, and wet supramolecular gels formed then as hot solutions were cooled down.…”

Section: Fabrication and Characterization Of Bn Aerogels With Different Level Of Structural Hierarchymentioning

confidence: 99%

“…Nonetheless, the elegant fabrication of BN aerogels with special hierarchy-and other ceramic aerogels alike-is quite challenging. In response to this situation, we recently developed an elegant scheme for preparing BN aerogels that embody varied superstructures (Pan and Wang, 2020), whereas little was known about what is accompanied with such complex structure and what would occur if the complex hierarchy fades.…”

Section: Introductionmentioning

confidence: 99%

Reduction of structural hierarchy translates into variable influence on the performance of boron nitride aerogel

Pan

Wang

2021

iScience

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The rise of ceramic aerogel offers traditional ceramics a new window. Alongside the emerging prospects, what is open to explore includes the elegant design of a ceramic aerogel with tailorable inner organizations, what would occur when complex hierarchy exists in such an already intricate system, and how the properties get influenced as the complexity fades. Borrowing the wisdom from supramolecular world, we exquisitely transform BN aerogel from a complex hierarchy to a flatten microstructure based on solvent-induced morphology switch of its supramolecular precursor gel. Such reduction in structural hierarchy has insignificant effect on the thermal conductivity ($0.027 W/(m$K)) but shifts the wettability from hydrophobicity to hydrophilicity and occasions nearly 3-fold difference in ion adsorption rate, as exemplified by lead ions. This work may promote the understanding of special hierarchy existing in delicate systems and inspire other attempts to harness the functionality of aerogels by manipulating structural hierarchy.

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“…Boron nitride (BN) aerogels are the ultralight ceramic materials assembled by BN nanoscale building block [1][2][3], and they exhibit low density, large specific surface area, excellent thermal/electrical insulation, outstanding chemical stability and desirable high-temperature oxidation resistance, which offer considerable advantages for various applications under extreme conditions [3], such as high-temperature superinsulation, thermal protection and environmental cleaning in harsh environment (acid, alkali), while the polymeric and carbonaceous aerogels could collapse easily with performance damping [4][5][6][7]. During the process of BN aerogels, how to construct porous network with nanoscale skeleton using BN nanoscale building blocks is of great significance for the mainstay of various applications [1]. Unfortunately, most of pristine BN nanoscale building blocks were fabricated by CVD growth or exfoliation from bulky BN, and they involve hazardous chemicals and arduous procedures [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…To add the diversity of BN aerogel microstructures and unlock their applications, various specific synthetic strategies that are different to the traditional sol-gel process have been explored [1][2][3], and various building blocks with different dimension were successfully used to construct BN aerogel porous network, such as nanoribbon [14,15], nanotube [16], nanosheet [17] and micro-/nanofiber [18]. Briefly, Rousseas et al developed a BN aerogel with highly chemical purity via the carbothermal reduction reaction between graphene aerogel, boron oxide and nitrogen, and this aerogel exhibited a unique interlinking structure [2].…”

Section: Introductionmentioning

confidence: 99%

Calcium-Doped Boron Nitride Aerogel Enables Infrared Stealth at High Temperature Up to 1300 °C

Zhu

Gong

et al. 2021

Nano-Micro Lett.

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Boron nitride (BN) aerogels, composed of nanoscale BN building units together with plenty of air in between these nanoscale building units, are ultralight ceramic materials with excellent thermal/electrical insulation, great chemical stability and high-temperature oxidation resistance, which offer considerable advantages for various applications under extreme conditions. However, previous BN aerogels cannot resist high temperature above 900 °C in air atmosphere, and high-temperature oxidation resistance enhancement for BN aerogels is still a great challenge. Herein, a calcium-doped BN (Ca-BN) aerogel with enhanced high-temperature stability (up to ~ 1300 °C in air) was synthesized by introducing Ca atoms into crystal structure of BN building blocks via high-temperature reaction between calcium phosphate and melamine diborate architecture. Such Ca-BN aerogels could resist the burning of butane flame (~ 1300 °C) and keep their megashape and microstructure very well. Furthermore, Ca-BN aerogel serves as thermal insulation layer, together with Al foil serving as both low-infrared-emission layer and high-infrared-reflection layer, forming a combination structure that can effectively hide high-temperature target (heated by butane flame). Such successful chemical doping of metal element into crystal structure of BN may be helpful in the future design and fabrication of advanced BN aerogel materials, and further extending their possible applications to extremely high-temperature environments.

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Boron nitride aerogels consisting of varied superstructures

Abstract: A multilevel assembly scheme is proposed for the elegant fabrication of boron nitride aerogels consisting of varied superstructures.

Cited by 21 publications

References 40 publications

Multi-functional 2D hybrid aerogels for gas absorption applications

Multi-functional 2D hybrid aerogels for gas absorption applications

Reduction of structural hierarchy translates into variable influence on the performance of boron nitride aerogel

Calcium-Doped Boron Nitride Aerogel Enables Infrared Stealth at High Temperature Up to 1300 °C

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