Pore Structure Control of Ordered Mesoporous Silica Film Using Mixed Surfactants

Abstract

Materials with nanosized and well-arranged pores have been researched actively in order to be applied to new technology fields. Especially, mesoporous material containing various pore structures is expected to have different pore structure. To form a mixed pore structure, ordered mesoporous silica films were prepared with a mixture of surfactant; Brij-76 and P-123 block copolymer. In mixed surfactant system, mixed pore structure was observed in the region of P-123/(Brij-76 + P-123) with about 50.0 wt.% while a single pore structure was observed in regions which have large difference in ratio between Brij-76 and P-123 through the X-ray diffraction analysis. Regardless of surfactant ratio, porosity was retained almost the same. It is expected that ordered mesoporous silica film with mixed pore structure can be one of the new materials which has distinctive properties.

Evolution of textural characteristics of surfactant-mediated mesoporous zirconia aerogel powders prepared via ambient pressure drying route

“…The sample ZA1 has higher surface area of ~ 204 m 2 /g and pore volume of 0.37 cc/g compared to the sample ZA2 possessing surface area of around 177 m 2 /g and pore volume of nearly 0.27 cc/g. The reason behind this may be the occupancy of Brij-76 in the voids of zirconia aerogels [32]. The high surface area and pore volume of the samples ZA1 and ZA2 is due to well-ordered mesostructure, which can be confirmed (Fig.…”

Mesoporous Non-stacked Graphene-receptor Sensor for Detecting Nerve Agents

“…The XRD data could also confirm the amorphous structure that usually has a broad peak 26 . In general, the XRD spectrum of the rGO film had a very sharp peak at 2∂ = 26° 27 , while NSrGO has a broad peak at 2∂ = 25° due to a randomly-distributed, non-stacked form of NSrGO nanosheets ( Fig.…”

Introduction of a Pore Connection Network into Mesoporous TiO2Films to Enhance CO Gas Sensitivity

“…The common ratio of wall thickness to pore size was confirmed based on previous studies involving the analysis of scattering plane, vertical spacing, pore size, and wall thickness. 24,25 The wall thicknesses of the mesoporous TiO 2 films annealed for 12, 24, and 48 h were expected to be 2.73, 2.54, and 2.20 nm with pore sizes of 5.45, 5.08, and 4.39 nm, respectively. When a 3-dimensional structure was considered, the maximum diagonal wall thicknesses of the films annealed for 12, 24, and 48 h were 8.71, 8.11, and 7.02 nm, respectively.…”