Any solid containing pores and voids. Porous materials have traditionally been categorised into microporous, mesoporous and macroporous materials. Microporous materials contain micropores, which have diameters or dimensions < 2 nm. Mesoporous materials contain mesopores, which have dimensions in the range 2 - 50 nm, and macroporous materials have pores > 50 nm. These definitions were formalised in International Union of Pure and Applied Chemistry (IUPAC) guidelines in 1985 (Sing et al, 1985). More recently the term 'nanoporous' has become popular. Following the definition of nanoscale as referring to a size range of approximately 1 - 100 nm (see, for example, ISO/TS 80004-1:2010), this terminology refers to materials with pores < 100 nm in dimension.

NMR Cryoporometry can measure both the nano-porous and meso-porous pore size distributions, and help determine how much of each you have. See http://www.Lab-Tools.com http://www.nano-metrology.co.uk/ http://en.wikipedia.org/wiki/Thermoporometry_and_cryoporometry#Nuclear_magnetic_resonance_cryoporometry

@Beau thank you for your valuable suggestion, i will go through them :)

yes absolutely we could identified the meso porosity in BEET Sorption isotherm and XRD low angle 2 thetas. I dont be feel it is much difficult to differentiate particle size (nano) which contains mesoporosity. You can subjected the material in the course of BEET check obviously find out porasity nature. I guess CTAB most is probability to create meso porous zirconia , in case your temperature condition and surfactant alter the porosity that may verified by Mr Beau suggestion.

Mercury base porosimetric analysis will enable you to determine the difference between nanomaterials and mesoporous. Nano has < 2 nm sizes and mesopores = 2 - 50nm sze. This analysis gives good information about the sizes and surface area

of the material.

Thank you all for your valuable suggestion will consider them :)

A combination of CO2, Ar, N2 and water adsorption techniques.

Dear Vijay

The range of porosity is

d < 2 nm = microporous, 2-50 nm = mesoporous, > 50 nm = macroporous

which so many of the RG contributors in this discussion have told. For mesoporosity you have to do BET (adsorption/desorption) surface area analysis. Another is small angle XRD(SAX) which could enable you to determine mesoporosity of the material. And for nanomaterial you could know it from XRD, TEM and also from FESEM analysis.

Hope this could help you.

All the Best

Regards:

Gobinda

To elaborate on what has been said previously, gas adsorption can characterize the mesopores (2 nm - 50 nm) using the BJH or Dollimore-Heal models. Above this range of pores, the mercury porosimetry is best, as long as compression of your material does not appear as pore filling. Please let me know if you have further questions about these techniques. Thanks.

- Andrew

 @Andrew D. D'AMico i have taken the isotherm of the  nano , bulk and mesoporous material but they all showes the similar kind of isotherms

i have checked the particle size by SEM where i can very easily separable the Nano and bulk :) 

does Nano showes lower surface area compared to meso ? 

Any solid containing pores and voids. Porous materials have traditionally been categorised into microporous, mesoporous and macroporous materials. Microporous materials contain micropores, which have diameters or dimensions < 2 nm. Mesoporous materials contain mesopores, which have dimensions in the range 2 - 50 nm, and macroporous materials have pores > 50 nm. These definitions were formalised in International Union of Pure and Applied Chemistry (IUPAC) guidelines in 1985 (Sing et al, 1985). More recently the term 'nanoporous' has become popular. Following the definition of nanoscale as referring to a size range of approximately 1 - 100 nm (see, for example, ISO/TS 80004-1:2010), this terminology refers to materials with pores < 100 nm in dimension.