Publication detail

Exfoliation of hexagonal boron nitride nanosheets in low-modulus concentrated alkali silicate suspensions

BERTOLLA, L. DLOUHÝ, I. ŠULÁK, I. BURŠÍK, J. SMILEK, J. MÁCOVÁ, P. HOLAS, J.

Original Title

Exfoliation of hexagonal boron nitride nanosheets in low-modulus concentrated alkali silicate suspensions

English Title

Exfoliation of hexagonal boron nitride nanosheets in low-modulus concentrated alkali silicate suspensions

Type

journal article in Web of Science

Language

en

Original Abstract

This work elucidated for the first time the role of highly concentrated water glass (WG) paste as exfoliating media for the high-yield production of boron nitride nanosheets (BNNSs). By taking into account the difficulties related to BNNSs exfoliation and dispersion and the paucity of reports about highly viscous exfoliating media, the findings herein reported are of technological interest. The basic rheological characterization of the WG/boron nitride pastes evidenced a strong interfacial adhesion between these components, with generation of high shear stresses at shear rates far below those commonly reported in literature. A refinement step, with the aim to separate the exfoliated BNNSs from the silicate was successfully implemented. Beside a considerable Cover Letter BNNSs yield, calculated as nearly 30%, the method evidenced how, upon precipitation of the pastes with HCl, the exfoliated BNNSs bound to the newly formed NaCl crystals and self-assemble into perfectly aligned and parallel arrows. We believe that further development of the described method might have technological potential for the high yield production of high quality BNNSs, and could offer a hint to applications requiring ordered surface topography and narrow nanosheets size distribution. Its applicability could be extended to other two-dimensional layered materials.

English abstract

This work elucidated for the first time the role of highly concentrated water glass (WG) paste as exfoliating media for the high-yield production of boron nitride nanosheets (BNNSs). By taking into account the difficulties related to BNNSs exfoliation and dispersion and the paucity of reports about highly viscous exfoliating media, the findings herein reported are of technological interest. The basic rheological characterization of the WG/boron nitride pastes evidenced a strong interfacial adhesion between these components, with generation of high shear stresses at shear rates far below those commonly reported in literature. A refinement step, with the aim to separate the exfoliated BNNSs from the silicate was successfully implemented. Beside a considerable Cover Letter BNNSs yield, calculated as nearly 30%, the method evidenced how, upon precipitation of the pastes with HCl, the exfoliated BNNSs bound to the newly formed NaCl crystals and self-assemble into perfectly aligned and parallel arrows. We believe that further development of the described method might have technological potential for the high yield production of high quality BNNSs, and could offer a hint to applications requiring ordered surface topography and narrow nanosheets size distribution. Its applicability could be extended to other two-dimensional layered materials.

Keywords

ceramics; nanoparticles; BNNSs; alkali silicate

Released

14.02.2021

ISBN

0167-577X

Periodical

MATERIALS LETTERS

Year of study

1

Number

1

State

NL

Pages from

1

Pages to

20

Pages count

20

URL

Documents

BibTex


@article{BUT170366,
  author="Luca {Bertolla} and Ivo {Dlouhý} and Ivo {Šulák} and Jiří {Buršík} and Jiří {Smilek} and Petra {Mácová} and Jiří {Holas}",
  title="Exfoliation of hexagonal boron nitride nanosheets in low-modulus concentrated alkali silicate suspensions",
  annote="This work elucidated for the first time the role of highly concentrated water glass (WG)
paste as exfoliating media for the high-yield production of boron nitride nanosheets (BNNSs). By taking into account the difficulties related to BNNSs exfoliation and dispersion and the paucity of reports about highly viscous exfoliating media, the findings herein reported are of technological interest. The basic rheological characterization of the WG/boron nitride pastes evidenced a strong interfacial adhesion between these components, with generation of high shear stresses at shear rates far below those commonly reported in literature. A refinement step, with the aim to separate the exfoliated BNNSs from the silicate was successfully implemented. Beside a considerable Cover Letter BNNSs yield, calculated as nearly 30%, the method evidenced how, upon precipitation of the pastes with HCl, the exfoliated BNNSs bound to the newly formed NaCl crystals and self-assemble into perfectly aligned and parallel arrows. We believe that further development of the described method might have technological potential for the high yield production of high quality BNNSs, and could offer a hint to applications requiring ordered surface topography and narrow nanosheets size distribution. Its applicability could be extended to other two-dimensional layered materials.",
  chapter="170366",
  howpublished="print",
  number="1",
  volume="1",
  year="2021",
  month="february",
  pages="1--20",
  type="journal article in Web of Science"
}