Dear Shilendra,

adsorption of ions, molecules, and so on ...is a phenomenon concerning the crystal surfaces exposed to the mother phase or to a given environment.

Crystal surfaces are related to the indexes of a given face (crystal planes being parallel to this face). Hence the indexes of a face can be, for instance, (110) and not (220). The most important question is: "what is the termination of a face ?", i.e. what's about the atoms (molecules) exposed to the surrounding medium ? In the case of NaCl crystal, assumed as an example, the (100) faces expose a neutral population made by Na (50%) and Cl (50%); on the contrary, the (111) faces can expose either Na (100%) or Cl (100 %). Hence the (111) faces exhibit a polar character which strongly influence the foreign adsorption.

I would like to send you a paper of mine in which this problem has been deeply discussed. Are you interested in ?

All the best !

Dino

It is differnt as plane will change , this means the arrangement of atoms varied in crystal lattice

Regards,

I am strongly agree with Prof. Aquilano view, as they mentioned that hkl value or active exposed phase depend on, geometry of as-synthesized materials for e.g. in fcc (111), maximum exposed, in tetragonal 101 or 110 is maximum exposed. Therefore activity depend on exposed face orientation.

Regards

Dinesh

Dear Prof. Dino Aquilano ,

Thank you first for your answer. I am interested you can send me your paper. My email_id is [email protected]

Actually surface 110 , 111 etc. are totally different but as I mentioned in my question surface 110 and 220 are the same the only difference is that same thickness of plane 220 will have number of atoms just half compare to 110 surface. If we do thickness of 220 plane double then it becomes same as 110 plane if we look same termination in both plane 110 and 220.

For example 110 surface of 10 Angs. thickness has 40 atoms then 220 plane of same thickness will have 20 atoms. So my question is that if we adsorb any molecule will give same effect in both plane or different. I am thinking theoretically we will get same effect it will depend on surface termination.

If experimentally we are adsorbing any species in bulk structure then growth will be same in 110 and 220 plane or same. Actually we are getting different effect in XRD along 110 and 220 plane.

For example our system contains 3 types of atoms. Is it possible experimentally at one time in 110 plane one type of atom exposing to external or adsorbate species and same time in 220 plane another type of atom exposing to same adsorbate species.

Shilendra

Dear Shilendra,

I'll give my answer to your question later on (sorry for that...). Nevertheless, I' m sending you four papers in which we outlined the importance of the outmost exposed layer of a given crystal face, when foreign adsorption is considered.

Thanks for your consideration !

Dino

I agree with Prof. Aquilano! In his studies the adsorption phenomenon is very well discussed from crystallographic point of view!

All the best,

Maria

Thank you so much, Maria, for your kind appreciation of the work done by my research group ! I'll be honoured of sending you a special issue of the journal "Crystal Research and Tecnology" devoted to an International School we organized on "Adsorption, Absorption and Crystal Growth".

If you are interested in, please give me the address of your Lab.

Thank you in advance

Dino

[email protected]

Dear Prof. Dino Aquilano

Thank you for sending me these 4 papers. I will read definitely all these papers. As you are talking special issue of the journal "Crystal Research and Tecnology" regarding "Adsorption, Absorption and Crystal Growth".

Is it online available ? It may be useful for me. Nowadays I am working on adsorption and absorption reactions.

Thank you for your kind help and support !

Shilendra

Dear Shilendra,

yes , you can download all the papers (13) building the special issue of the journal I quoted.

The correct reference is : "Crystal Research and Tecnology" (Wiley - VCH) volume 48, number 10, October 2013, pp 667-942

Dino

Good question