Mesoporous Materials

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MESOPOROUS MATERIALS
By, Mr. Mohd. Manazir
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Agenda

• Introduction to porous materials.
• Classification of porous materials
• Mesoporous materials
• Types and composition of mesoporous materials
• Soft template strategy of synthesis of mesoporous
  materials
• Properties and applications of mesoporous
  materials

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What is porous materials ???

• The materials that consists continuous and solid
  network material filled through voids.
• If a material consists an internal void then it
  can be said as porous material
• The first porous material was synthesized by
  using single template molecule consisting of
  zeolites having aluminosilicate frameworks

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Nanoporous materials

• Any materials that consists of pores in the size
  of nano level in its structure is called a porous
  materials.
• Nanoporous materials consists of a regular
  organic or inorganic frameworks supporting
  regular porous structures.
• Size 100nm
• These can be classified into further bulk and
  membrane materials
• Ex Activated carbon , zeolites

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What is a mesoporous material?

• If the pores diameter is of size 2nm to 50 nm
  then it is called a MESOPOROUS MATERIAL.
• A patent was given in 1970 for the fabrication.
• In 1997 these were produced in japan
  laboratories.

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Types of mesoporous materials

• Mesoporous materials are classified as follows
• Ordered Mesoporous materials
• Disordered mesoporous materials
• Purely organic
• Organic inorganic hybrid
• Purely inorganic

Based on arrangement
Based on composition
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Composition of mesoporous material

• Composition
• Silica and alumina with similar sized mesopores.
• Oxides of tantalum, niobium, titanium, zirconium
  tin
• Gold, silver are also embedded for the system

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Synthesis of mesoporous materials

• There are basically 2 methods
• Soft template (endo template)
• Hard template (exo template, nano casting)

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Soft template strategy

1. Surfactants
2. Micelles formation
3. Inorganic precursor
4. Micelles precursor interaction
5. Hydrothermal treatment followed by separation and
   drying
6. Template removal
7. Mechanism
8. Characterisation

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Properties of mesoporous materials

• High surface area 400-1000 m2/g
• Large pore volume.
• High stability

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Characterization of mesoporous materials

• There are 3 methods to characterize the
  mesoporous materials
• X-ray diffraction method
• Nitrogen sorption measurements
• TEM images

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• Based on X-ray diffraction method
• The low angle XRD gives
• Orderness and disorderness
• Based on nitrogen sorption measurements
• The sorption of nitrogen gives
• Surface area
• Pore diameter
• Pore volume
• Based on TEM images
• TEM images helps to identify the
• Morphology
• Wall thickness
• Order of the material

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Applications

• The size of the pores gives the material to be
  suitable for
• Good chemical catalysis.
• Chemical sensors.
• Molecular separators.
• Drug delivery
• Bone regeneration

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Thank you