Surfactant-assisted individualization and dispersion of boron nitride nanotubes

McWilliams, Ashleigh D. Smith; Reyes, Carlos A. de los; Liberman, Lucy; Ergülen, Selin; Talmon, Yeshayahu; Pasquali, Matteo; Martí, Ángel A.

doi:10.1039/c8na00315g

Cited by 41 publications

(58 citation statements)

References 53 publications

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“…In this study, a non-ionic surfactant (Pluronic) is introduced to assist in the dispersion of the high surface energy nanotubes. Non-ionic surfactants have shown to be the most effective surfactants to allow the effective dispersion of nanotubes, yielding high concentrations of individual BNNTs 55,76 . The amphiphilic nature of surfactants allows them to possess both hydrophobic and hydrophilic properties.…”

Section: Dispersion Of Bnnt By Wet Chemistry Routementioning

confidence: 99%

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Boron Nitride Nanotube–Reinforced Titanium Composite with Controlled Interfacial Reactions by Spark Plasma Sintering

Bustillos

Nautiyal

et al. 2020

Adv Eng Mater

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In this study, Boron Nitride Nanotube (BNNT) reinforced Titanium matrix composites are synthesized by Spark Plasma Sintering. Two main challenges directly affecting the mechanical performance of BNNT-metal matrix composites are addressed:(i) Homogenous dispersion of high surface energy BNNTs, and (ii) Controlling interfacial reactions at the metal/nanotube interface. High affinity of acetone with BNNTs and high energy ultrasonication induced the mechanical dispersion and stability of BNNTs in their dispersion. The sintering of Ti (99% relative density) was achieved at 50% less processing temperature than those used in conventional sintering to minimize interfacial reactions when reinforced with BNNTs. The reduction of temperatures in addition to the reduction (by 91%) in processing times was shown to control reaction phases. Bulk compressive yield strengths of Ti-BNNT sintered at low (750 o C) and high (950 o C) temperatures were improved by 21% and 50% respectively, as compared to Ti alloy without reinforcement. Twin boundaries, pinning of dislocations by BNNTs, and crack bridging were strengthening mechanisms identified in the composites. vi TABLE OF CONTENT CHAPTER

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Section: Dispersion Of Bnnt By Wet Chemistry Routementioning

confidence: 99%

“…Reduction of surface tension between the nanotube and aqueous media, promoting wetting of the nanotubes; (ii) disentanglement and destruction of agglomerates of long BNNTs by ultrasonic assisted route; and (iii) achieving a stable dispersion of BNNTs inhibiting reagglomerates 76 .…”

Section: Role Of Surfactant In the Dispersion Of Bnntsmentioning

confidence: 99%

Boron Nitride Nanotube–Reinforced Titanium Composite with Controlled Interfacial Reactions by Spark Plasma Sintering

Bustillos

Nautiyal

et al. 2020

Adv Eng Mater

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“…Individual BNNTs and the bundle have to be separated in order to be utilized in practical applications. Although this process could be carried out by applying both covalent and non-covalent functionalization, the second one seems to be more suitable because it maintains the intrinsic properties of the BNNTs [41,42]. In addition to the above-mentioned advances in the field of dispersion and functionalization of BNNT, several new approaches could be suggested to extend the possibility of different technical applications; however, there are other significant developed covalent and non-covalent approaches [41,43].…”

Section: Dispersion Of Nanotubesmentioning

confidence: 99%

“…Although this process could be carried out by applying both covalent and non-covalent functionalization, the second one seems to be more suitable because it maintains the intrinsic properties of the BNNTs [41,42]. In addition to the above-mentioned advances in the field of dispersion and functionalization of BNNT, several new approaches could be suggested to extend the possibility of different technical applications; however, there are other significant developed covalent and non-covalent approaches [41,43]. In this regard, we will discuss the recent developments concerning the dispersion and functionalization of BNNTs obtained by experimenting in the ""Experimental evidence", and to get more insights on the details, theoretical studies are presented in the "Theoretical investigations".…”

Section: Dispersion Of Nanotubesmentioning

confidence: 99%

A mini-review on dispersion and functionalization of boron nitride nanotubes

Foroutan

Fatemi

2019

J Nanostruct Chem

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Boron nitride nanotubes (BNNTs) are of intense scientific interest due to their unrivaled physicochemical characteristics, extraordinary thermal, electronic, mechanical, optical properties and prospective applications in various nanotechnologies. Therefore, they are particular candidates for the development of new materials potentially applied in abundant applications. However, obtaining homogenous composite materials requires a good dispersion of BNNTs, as well in solvents or in the matrix, which still has remained challenging. The preparation of effective dispersions of BNNTs presents a major impediment to the extension and utilization of BNNTs. BNNTs intrinsically tend to bundle and/or aggregate. The prevention of such behavior has been explored by testing various techniques to improve the dispersibility of BNNTs in a variety of solvents. There are mainly two approaches to obtain a good quality dispersion; chemical functionalization and physical interactions. The chemical functionalization technique has been found effective, but deteriorates the intrinsic properties of BNNTs through the introduction of defects on the wall. Physical blending approaches with the ultrasound and high-speed shearing have been proven capable of debundling BNNTs and stabilizing individual BNNTs while maintaining their integrity and intrinsic properties. Attention has been brought to the study of the dispersion of BNNTs in aqueous media and most attention is paid to molecular dynamics simulation techniques and other physical techniques, as well as to the use of various surfactants and polymers.

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“…23 PEI is an example of a non-toxic (at relevant concentrations of <0.01 wt%) and non-ionic dispersant which has previously been shown to stabilize BNNTs for cytotoxicity evaluations. 18 Surface functionalization and modication of BNNTs 24 with polymers has allowed for the production of stable dispersions, though it should be noted that these modications are potentially capable of masking the cytotoxic effects of BNNTs. 14 In addition to the thorough understanding of the asproduced BNNT-1 candidate reference material's characteristics, post-production processing, in particular modication of the length and aspect ratio of BNNTs, is important for their use in a variety of applications.…”

Section: Introductionmentioning

confidence: 99%