A Mesoporous Superlattice Consisting of Alternately Stacking Interstitial Nanospace within Binary Silica Colloidal Crystals

• Published in: Angewandte Chemie (International ed.) Vol. 55; no. 36; pp. 10702 - 10706
• Main Authors: Kuroda, Yoshiyuki, Shimbo, Yosuke, Sakamoto, Yasuhiro, Wada, Hiroaki, Kuroda, Kazuyuki
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Publishing Ltd 26.08.2016; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: Assembly; Coating; colloidal crystals; Colloids; Crystal structure; Crystals; Face centered cubic lattice; Immersion coating; mesoporous materials; Nanoparticles; Nanospheres; Silica; Silicon dioxide; Stacking; Stacks; thin films; nanoparticles; mesoporous materials; silica; colloidal crystals; thin films
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201605027

A novel class of nonclassical structures of mesoporous silica, namely a binary nanoparticle mesoporous superlattice (BNMS), is obtained by the assembly of silica nanospheres of different sizes into a binary colloidal crystal. The colloidal crystal has a CrB‐type structure and consists of alternate stacks of unary fcc and binary AlB2‐type structures along the b axis and has four types of interstitial mesopores. The BNMS can be deposited on a substrate by dip coating to form an oriented thin film in which the direction of the superstructure (b axis) is perpendicular to the substrate. Pores for thought: The assembly of silica nanospheres of different sizes into a binary colloidal crystal has resulted in a superlattice of nanospace. The CrB‐type binary silica colloidal crystals contain interstitial mesopores of different sizes that are spatially separated along the stacking direction. An oriented thin film of the binary nanoparticle mesoporous superlattice has been fabricated on a silicon substrate by dip coating.