Boron atomic layer sheet and laminated sheet, method for manufacturing the same, and liquid crystals

Patent metadata

Field	Value
Publication number	US-11795059-B2
Application number	US-201916647739-A
Country	US
Kind code	B2
Filing date	Jan 31, 2019
Priority date	Feb 7, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

Provided are an atomic layer sheet that contains boron and oxygen as framework elements, is networked by nonequilibrium couplings having boron-boron bonds, and has a molar ratio of oxygen to boron (oxygen/boron) of less than 1.5, a laminated sheet containing a plurality of such atomic layer sheets and metal ions between ones of the sheets, and a thermotropic liquid crystal and a lyotropic liquid crystal containing these. In addition, there is provided a method for manufacturing an atomic layer sheet and/or a laminated sheet containing boron and oxygen, the method including: adding MBH 4 , where M represents an alkali metal ion, into a solvent containing an organic solvent in an inert gas atmosphere to prepare a solution; and exposing the solution to an atmosphere containing oxygen.

First claim

The invention claimed is:

1. An atomic layer sheet comprising an atomic layer comprising boron and oxygen as framework elements, wherein the atomic layer sheet is networked by nonequilibrium couplings having boron-boron bonds, and has a molar ratio of oxygen to boron of less than 1.5, and wherein the atomic layer comprising boron and oxygen is anionic.

2. The atomic layer sheet according to claim 1 , further comprising alkali metal ions, wherein a molar ratio of alkali metal ion to boron is less than 1.

3. The atomic layer sheet according to claim 1 , wherein a composition of the framework is B 5 O 3 , the framework has three-fold symmetry having boron-boron bonds, the atomic layer sheet comprising:
a constituent X that serves as the framework; and
a constituent Y other than the constituent X,

wherein the constituent Y is a terminal part and/or a deficient part,
and wherein the constituent Y is a boron oxide part containing B—OH.

4. The atomic layer sheet according to claim 3 , wherein, in X-ray photoelectron spectrometry, the atomic layer sheet has a peak derived from a B-1s level at each of range of 190.5 to 193.0 eV, and 192.5 to 194.0 eV.

5. The atomic layer sheet according to claim 4 , wherein, in the X-ray photoelectron spectrometry, the peak at a range of 190.5 to 193.0 eV corresponds to the constituent X.

6. The atomic layer sheet according to claim 3 , wherein, in IR measurement, the atomic layer sheet has two kinds of peaks derived from B—O stretching at around 1300 to 1500 cm −1 , and further has a peak derived from BO—H stretching at around 3100 cm −1 .

7. The atomic layer sheet according to claim 6 , wherein, in the IR measurement, a peak on a low wave number side out of the two kinds of peaks derived from B—O stretching corresponds to the constituent X.

8. A laminated sheet comprising:
a plurality of atomic layer sheets each according to claim 1 ; and
metal ions between the plurality of atomic layer sheets.

9. The laminated sheet according to claim 8 , wherein the metal ion is an alkali metal ion.

10. The laminated sheet according to claim 9 , wherein a molar ratio of alkali metal ion to boron is less than 1.

11. A crystal comprising the laminated sheet according to claim 8 .

12. A thermotropic liquid crystal comprising the atomic layer sheet according to claim 1 .

13. The thermotropic liquid crystal according to claim 12 comprising a laminated sheet incorporating metal ions between a plurality of the atomic layer sheets.

14. The thermotropic liquid crystal according to claim 13 , wherein the metal ion is an alkali metal ion, and the laminated sheet has a molar ratio of alkali metal ion to boron of less than 1.

15. The thermotropic liquid crystal according to claim 12 , wherein a composition of the framework is B 5 O 3 , the framework has three-fold symmetry having boron-boron bonds, the atomic layer sheet comprising:
a constituent X that serves as the framework; and
a constituent Y other than the constituent X,

wherein the constituent Y is a terminal part and/or a deficient part,
and wherein the constituent Y is a boron oxide part containing a B 2 O 3 unit.

16. A lyotropic liquid crystal comprising the atomic layer sheet according to claim 1 .

17. The lyotropic liquid crystal according to claim 16 comprising a laminated sheet incorporating metal ions between a plurality of the atomic layer sheets.

18. The lyotropic liquid crystal according to claim 16 , wherein the metal ion is an alkali metal ion, and the laminated sheet has a molar ratio of alkali metal ion to boron of less than 1.

19. The lyotropic liquid crystal according to claim 16 , wherein the atomic layer sheet has a composition of a framework of B 5 O 3 , the framework has three-fold symmetry having boron-boron bonds, the atomic layer sheet comprising:
a constituent X that serves as the framework; and
a constituent Y other than the constituent X,

wherein the constituent Y is a terminal part and/or a deficient part,
and wherein the constituent Y is a boron oxide part containing B—OH.

Assignees

• Tokyo Inst Tech

Inventors

• Kambe Tetsuya
• IMAOKA Shotaro
• Watanabe Aiko
• Yamamoto Kimihisa

Classifications

• C01B35/1027 Primary

  Oxides · CPC title

• C30B29/16

  Oxides · CPC title

• C30B29/68

  Crystals with laminate structure, e.g. "superlattices" · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title