Insights into Hierarchically Structured Porous Materials: From Nanoscience to Catalysis, Separation, Optics, Energy, and Life Science

Su, Bao‐Lian; Sánchez, Clément; Yang, Xiao

doi:10.1002/9783527639588.ch1

Cited by 86 publications

(139 citation statements)

References 241 publications

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“…Also, the structural framework of the solid is indeed amorphous, which is latter shown by XRD. These features are not surprising when the well-suited methodologies to prepare porous binary metal oxides with defined pore hierarchy are taken into consideration [18][19][20][21]. The SiAlA, TiAlA and TiSiA samples have aspects morphologically similar to ZrSiA.…”

Section: Meso-macrostructure and Morphologymentioning

confidence: 97%

“…The findings states that the materials with conical hollow parallel macropores and possessing mesoporous walls are obtained after ethanol extraction of as-synthesized Zr and Ti based compounds [18,21]. Of course, the possibility of emulsion templating with ethanol during extraction and reflux processes causing shrinkage of the pores and thus, producing micropores cannot be fully excluded.…”

Section: Porosity Studiesmentioning

confidence: 99%

“…They can be obtained by templated sol-gel, microwave, hydrothermal and spin coating, among other synthesis routes [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Binary Oxides with Defined Hierarchy of Pores in the Esterification of Glycerol

et al. 2016

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Abstract:Various porous binary oxides with elevated textural properties were obtained in this work. The as-synthesized solids were calcined or modified by reflux and extraction processes. Characterizations through SEM, nitrogen physisorption and TEM techniques demonstrated the formation of porous metal oxide networks over all solids. XRD, thermal analyses and FTIR measurements showed the existence of nanosized rutile TiO 2 , tetragonal ZrO 2 , SiO 2 and γ-Al 2 O 3 phases on the solids. The structure and texture of the as-synthesized SiAl sol-gel derived solid resulted in the formation of well-dispersed nanoparticles on the support. The removal of the organic compounds by ethanol extraction or reflux from SiAl resulted in the presence of structures with defined hierarchy of pores. Among the solids studied, the catalytic results in the esterification of glycerol with acetic acid indicated that best performances were obtained over SiAl sample when submitted to extraction and reflux treatments. This was due to the creation of accessible pores, which facilitated the reaction occurrence at glycerol to acetic acid molar ratio = 1:3 and T = 80 • C for 20 h using 75 mg of catalyst. The solids can be reused three times without complete loss of their catalytic performance.

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Section: Meso-macrostructure and Morphologymentioning

confidence: 97%

Section: Porosity Studiesmentioning

confidence: 99%

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Binary Oxides with Defined Hierarchy of Pores in the Esterification of Glycerol

et al. 2016

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“…Development of porous material with a higher surface is widely investigated such as adsorption, chromatography, catalysis, sensor, and gas storage [1][2][3][4]. Hierarchical is one of the pore modification technologies.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Hierarchical ZSM-5 from Indonesian Kaolin by Adding Silica

Hartati¹,

Widati²,

Setyawati³

et al. 2016

ChChT

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Abstract. Hierarchical ZSM-5 was prepared using Bangka kaolin-Indonesia in the absence of structure directing agent. The effect of hydrothermal time and temperature was investigated. The prepared samples were characterized by XRD, XRF, FT-IR, and N 2 adsorption/desorption. The results show that hierarchical ZSM-5 can be obtained at hydrothermal temperature of 393-448 K. Moreover, this method also produces mordenite and quartz as by-products.

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“…After the thermal treatment, polymers were removed and HAp fibers (or particles) are sintered to form a ceramic with interconnected porosity in micro (1-5 μm) and macro (20-40 μm) scales. This is relevant for the application as bone replacement because the osteocyte cells have a size between 100 and 500 nm [51], while osteoclast cells have a size of about 10 μm [52], which means that there is sufficient space to move through the porous structure. …”

Section: Elaboration Of Hap Ceramics With Interconnected Porositymentioning

confidence: 99%

HAp Nanofibers Grown with Crystalline Preferential Orientation and Its Influence in Mechanical Properties of Organic-Inorganic Composite Materials

Rivera-Muñoz¹,

Velázquez-Castillo²,

Sierra³

et al. 2018

Hydroxyapatite - Advances in Composite Nanomaterials, Biomedical Applications and Its Technological Facets

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There are several synthesis techniques to obtain hydroxyapatite (HAp). Some use surfactant agents, amino acids or halogen salts to control structural nucleation and crystal growth. In others, the use of hydrothermal process to carry out the reaction is effective for HAp synthesis. Microwave-assisted hydrothermal method (MAHM) has been successfully applied in the synthesis of HAp nanostructures, which present well-defined morphologies, high crystallinity and high purity. This is important because nano-HAp is attracting interest as a biomaterial for use in prosthetic applications due to its similarity in size, crystallinity and chemical composition with human hard tissue. In this chapter, developments in obtaining HAp nanofibers, with a crystal growth with preferential orientation, as well as morphology control achieved by using the MAHM is discussed. Also, the synthesized fibers were used to cast ceramics with controlled and interconnected porosity through the modified gelcasting process. Then, these HAp ceramics were impregnated with a water solution of gelatin in order to obtain an organic-inorganic composite material, similar to natural bone tissue. The maximum compressive strengths were determined and the composite materials showed mechanical properties that make them suitable to be used as bone tissue implants.

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Insights into Hierarchically Structured Porous Materials: From Nanoscience to Catalysis, Separation, Optics, Energy, and Life Science

Cited by 86 publications

References 241 publications

Binary Oxides with Defined Hierarchy of Pores in the Esterification of Glycerol

Binary Oxides with Defined Hierarchy of Pores in the Esterification of Glycerol

Preparation of Hierarchical ZSM-5 from Indonesian Kaolin by Adding Silica

HAp Nanofibers Grown with Crystalline Preferential Orientation and Its Influence in Mechanical Properties of Organic-Inorganic Composite Materials

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