US 12,030,783 B2
Method for producing core-shell porous silica particles
Daisuke Fukuda, Tokyo (JP); Daisuke Nagao, Sendai (JP); Haruyuki Ishii, Sendai (JP); and Shunho Ishikawa, Sendai (JP)
Assigned to TOHOKU UNIVERSITY, Sendai (JP); and DAICEL CORPORATION, Osaka (JP)
Appl. No. 17/271,704
Filed by TOHOKU UNIVERSITY, Sendai (JP); and DAICEL CORPORATION, Osaka (JP)
PCT Filed Aug. 13, 2019, PCT No. PCT/JP2019/031828
§ 371(c)(1), (2) Date Feb. 26, 2021,
PCT Pub. No. WO2020/045077, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 2018-159597 (JP), filed on Aug. 28, 2018.
Prior Publication US 2021/0316997 A1, Oct. 14, 2021
Int. Cl. C01B 33/18 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC C01B 33/18 (2013.01) [B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/04 (2013.01); C01P 2004/32 (2013.01); C01P 2004/62 (2013.01); C01P 2004/82 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/16 (2013.01)] 7 Claims
 
1. A production method for a core-shell porous silica particle, the method comprising:
(a) preparing an aqueous solution containing a non-porous silica particle, a cationic surfactant, a basic catalyst, and an alcohol;
(b) adding a silica source to the aqueous solution to form a shell precursor on a surface of the non-porous silica particle;
(c) removing the cationic surfactant from the shell precursor and forming a porous shell;
(d) preparing an aqueous solution containing a porous silica particle resulting from the forming the porous shell, a cationic surfactant, a basic catalyst, and an alcohol;
(e) adding a silica source to the aqueous solution to form a shell precursor on a surface of the porous silica particle; and
(f) removing the cationic surfactant from the shell precursor and forming a porous shell; wherein
the steps (d) to (f) are further repeated one to three times, in which case the “forming the porous shell” in step (d) refers to the “forming a porous shell” in step (f).