Composite material, sheet, and heat insulator

1. A composite material comprising:

aerogel particles; and

a cellulose derivative having an alkyl group having 6 to 26 carbon atoms,

wherein a content of the aerogel particles is 95 vol % or more.

2. The composite material according to claim 1 , wherein the cellulose derivative has a structural unit represented by Formula (A-1)

wherein R A represents a hydrogen atom, an alkyl group, a hydroxyalkyl group, or a group represented by —R A1 —O—R A2 (in which R A1 represents an alkanediyl group and R A2 represents an alkyl group), and

wherein at least one instance of R A in the Formula (A-1) is the alkyl group having 6 to 26 carbon atoms or a group represented by —R A1 —O—R A2 (in which RAI represents an alkandiyl group and R A2 represents the alkyl group having 6 to 26 carbon atoms).

3. A sheet comprising the composite material according to claim 1 .

4. A heat insulator comprising the composite material according to claim 1 .

5. A composite material comprising:

aerogel particles; and

at least one cellulose-based resin selected from the group consisting of cellulose and a cellulose derivative,

wherein a content of the aerogel particles is 95 vol % or more, and

wherein a content of the cellulose-based resin is 0.1 vol % or more and 3 vol % or less.

6. A sheet comprising the composite material according to claim 5 .

7. A heat insulator comprising the composite material according to claim 5 .

8. A composite material comprising:

aerogel particles;

at least one cellulose-based resin selected from the group consisting of cellulose and a cellulose derivative; and

a binder resin,

wherein a content of the aerogel particles is 95 vol % or more.

9. The composite material according to claim 8 , wherein a content of the binder resin is 0.1 vol % or more and 4 vol % or less.

10. A sheet comprising the composite material according to claim 8 .

11. A heat insulator comprising the composite material according to claim 8 .