Nanostructured KIT-6 materials functionalized with sulfonic groups for catalytic purposes

2022

Preprint

The paper considers the mesophases of lyotropic liquid crystals and their role in creating the scaffold of mesoporous silica materials. It was in 1992 that a Mobil Research group disclosed a method to produce silica particles having a regular network of pores with hexagonal and cubic symmetries. The method was proposed as based on a liquid-crystal 'templating' mechanism. Since the symmetries resulting from the templating of silica scaffolds are those observed in the mesophases of lyotropic liquid crystals, the Mobil Research group supposed the presence of a mesophase directly in a stage of the templating mechanism. Here we discuss the method as it was reported in 1992 and what is today defined as a true liquid-crystal templating approach. It will be stressed that, in any case, the templating is a surfactant-assisted method, that can be better defined as supramolecular templating method. The template mainly happens in the form of a modified Stöber process. In this framework, the cubic phases of liquid crystals will be analyzed in depth. The related surfaces with zero mean curvature will be discussed in detail. Among them the gyroid will by approached through a Ginzburg-Landau model too.

Section: Kit-6mentioning

confidence: 83%

Liquid crystal templates of mesoporous silica materials

2022

Preprint

“…1), analogous to those observed in the structure of MCM-48 material, but with larger pore sizes, besides possessing a high hydrothermal stability (Wawrzyńczak et al, 2022). The KIT-6 network of channels can provide easy access and diffusion for different molecules in the channels without blocking them (Wawrzyńczak et al, 2022).…”

Section: Kit-6mentioning

confidence: 83%

“…al., 2022, where the researchers reported their synthesis route of KIT-6 with commercially available P123-butanol mixture in aqueous solution. Also byWawrzyńczak et al, 2022, it is stressed that the structure can be used as a template to fabricate successfully bicontinuous arrays of nanotube-type carbon, the CMK-9 mesoporous carbon, as well as rod-type, the CMK-8. CMK means Carbon Mesostructured by KAIST, Korea Advanced Institute of Science & Technology.…”

mentioning

confidence: 99%

Liquid crystal templates of mesoporous silica materials

2022

Preprint

The paper considers the mesophases of lyotropic liquid crystals and their role in creating the scaffold of mesoporous silica materials. It was in 1992 that a Mobil Research group disclosed a method to produce silica particles having a regular network of pores with hexagonal and cubic symmetries. The method was proposed as based on a liquid-crystal 'templating' mechanism. Since the symmetries resulting from the templating of silica scaffolds are those observed in the mesophases of lyotropic liquid crystals, the Mobil Research group supposed the presence of a mesophase directly in a stage of the templating mechanism. Here we discuss the method as it was reported in 1992 and what is today defined as a true liquid-crystal templating approach. It will be stressed that, in any case, the templating is a surfactant-assisted method, that can be better defined as supramolecular templating method. The template mainly happens in the form of a modified Stöber process. In this framework, the cubic phases of liquid crystals will be analyzed in depth. The related surfaces with zero mean curvature (gyroids) will by discussed through a Ginzburg-Landau model.

“…These materials were first synthesized by Ryong Ryoo's research group of the Korea Advanced Institute of Science and Technology in 2003 (Kleitz et al, 2003). The regular structure is characterized by a three-dimensional interpenetrating arrangement of cylindrical mesopores, analogous to those observed in the structure of MCM-48 material, but with larger pore sizes, besides possessing a high hydrothermal stability (Wawrzyńczak et al, 2022). The KIT-6 network of channels can provide easy access and diffusion for different molecules in the channels without blocking them (Wawrzyńczak et al, 2022).…”

Section: Kit-6mentioning

confidence: 85%

Liquid crystal templates of mesoporous silica materials

2022

Preprint

The paper considers the mesophases of lyotropic liquid crystals and their role in creating the scaffold of mesoporous silica materials. It was in 1992 that a Mobil Research group disclosed a method to produce silica particles having a regular network of pores with hexagonal and cubic symmetries. The method was proposed as based on a liquid-crystal 'templating' mechanism. Since the symmetries resulting from the templating of silica scaffolds are those observed in the mesophases of lyotropic liquid crystals, the Mobil Research group supposed the presence of a mesophase directly in a stage of the templating mechanism. Here we discuss the method as it was reported in 1992 and what is today defined as a true liquid-crystal templating approach. It will be stressed that, in any case, the templating is a surfactant-assisted method, that can be better defined as supramolecular templating method. The template mainly happens in the form of a modified Stöber process. In this framework, the cubic phases of liquid crystals will be analyzed in depth. The related surfaces with null mean curvature (gyroids) will by discussed through a Ginzburg-Landau model.