title: Encapsulation method for the dispersion of NiO onto ordered mesoporous silica, SBA-15, using polyethylene oxide (PEO).
abstract: An effective method for dispersing NiO onto ordered mesoporous silica, SBA-15, is described. The procedure involves the use of polyethylene oxide (PEO) as an encapsulating agent. It can be expected that encapsulation between PEO and Ni2+ ions mainly involves complexes between PEO and Ni2+ ions. Both N2 adsorption/desorption isotherm and TEM analyses indicate that a 2-dimensionally hexagonal pore structure with a distinct pore symmetry (space group P6mm) is maintained throughout the procedure, even though both Ni2+ ions and PEO are present in the middle of the self-assembly of mesostructured silica. The particle size of the NiO increases slightly as a function of PEO concentration. When the ratio of PEO to the templating agent (triblock copolymer, polyethylene oxide-polypropylene oxide-polyethylene oxide) reaches a value of 4.5, ordered mesoporous silica with NiO is hardly formed.
authors.affiliation: Samsung Electro-Mechanics Co., Ltd., Suwon, Gyunggi-Do, Republic of Korea.
authors.forename: Younggeun
authors.initials: Y
authors.lastname: Park
authors.forename: Taewook
authors.initials: T
authors.lastname: Kang
authors.forename: Pil
authors.initials: P
authors.lastname: Kim
authors.forename: Jongheop
authors.initials: J
authors.lastname: Yi