Fabrication of core–shell structured mesoporous silica nanospheres with dually oriented mesochannels through pore engineering

Abstract

Core–shell structured mesoporous silica nanospheres with penetrating mesochannels in the core and radial mesochannels in the shell.

Esterification of oleic acid with methanol by immobilized lipase on wrinkled silica nanoparticles with highly ordered, radially oriented mesochannels

“…Size and wrinkled structures of WSNs are sensitive to the molar ratio of CTAB to PVP. This finding is consistent with previous results [27].…”

“…2d and S2d) and radially align toward the edge of surfaces because of restrictive power, strong selective adsorption, and molecular self-assembly of PVP molecular chains [37][38][39]. This property may facilitate the diffusion of the guest molecules throughout the WSNs [27]. Mesostructures of mesoporous silica spheres prepared at different ratios of CTAB to PVP can be further verified by small-angle XRD patterns (Fig.…”

“…Basset [26] formed fibrous silica nanospheres (KCC-1) using ordered fibers coming out from the center of particles and along the free radial directions in all directions, thereby producing fibrous pore morphology. Recently, Peng et al synthesized core-shell MSNs containing controlled pore orientation (penetrating and radial pores), pore size (3.0 nm to 7.3 nm), and mesostructure (2-D hexagonal and 3-D cage-like) [27]. In particular, MSNs with radiation-aligned mesopores (the pores of silica nanoparticles are mesoporous with large centerradial pore channels in random orientations) are found to have promising biomedical and catalytic applications for immobilizing some guest molecules such as enzymes, which allow active catalytic sites to disperse onto large internal surfaces and pores, which in turn improve the activity of catalyst system [28][29][30].…”

Preparation of core–shell mesoporous silica nanoparticles with bimodal pore structures by regrowth method

“…Third, MSNs with larger pores in the cores and smaller pores in the shells were synthesized by adding TMB in the core formation step and by adding additional CTAB in the shell formation step. Although pore size expansion of mesoporous silica by adding pore-expanding agents such as TMB, alkylamines, and toluene has been reported [27][28][29][30], we propose a novel approach for the successful preparation of core-shell MSNs with bimodal pore structures. …”

Colloidal Mesoporous Silica Nanoparticles

“…In addition, Peng et al investigated the effect of the amount of trimethylbenzene on various parameters, such as hydrodynamic diameter and pore size, which will enable us to prepare colloidal MSNs with desired pore sizes and structures. 339 On the other hand, we used triisopropylbenzene as a swelling agent instead of trimethylbenzene. 346 We found that this swelling agent has a stronger ability to cause the swelling of the surfactant micelles.…”