What is the difference between physical binding and chemical binding, in terms of change in physical and chemical properities, considering both the binder and the photocatalyst materials are inorganic?
Definitely it will effect charge transfer properties, like people worked on mixed oxideds or anchored metal oxides... even further i have synthesised a material nanopartical supported on metal oxide with organic binder.
Chemical bonds are formed in the chemical binding, but not in the physical one. The elecrostatic interaction is an example of physical binding
Hello Yurii
With my respect, electrostatic interaction is not example of physical binding. Electrostatic is one type of chemical bonds.
Physisorption occurs in a way of secondary bonds (kind of weak London forces at best, or even liquefaction at surface) not primary chemical bonding.
Moreover, chemical bonding changes the system characteristics and consequently changes the catalytic process.
A discussion without strict definitions of terms is unproductive. From the point of view of quantum mechanics, chemistry can be described as the science of electromagnetic interaction between nuclei and electrons. The classical electrostatic interaction includes only a long range residual of quantum electromagnetic interactions. This long-range tail is commonly described by Coulomb’s law. Therefore, the electrostatic interaction is often called the Coulombic interaction and can be classified as the chemical or physical interaction depending on the definition of the terms “chemical bond” and “Physical bond.” The strong chemical bond between a cation and an anion is called the ionic bond (not electrostatic), which is the result of electromagnetic interaction of moving electrons and nuclei. The formation of ion-pairs in solution would be a good example to discuss the nature of the interaction in this case. Both “chemical” and “physical binding” can be described by the change in free Gibb’s energy. Concerning the question of Anand Thati: “What is the difference between physical binding and chemical binding, in terms of change in physical and chemical properities.” I would answer, there is no fundamental difference between physical and chemical bindings, in terms of change in physical and chemical properties
Thank you sir,
What if both the binder and the photo catalyst materials are having the same chemical compounds in it? like both contained phosphate in it.What could be the effect?
I don't know details and have no experimental data. I would avoid speculations.
Solid CuSO4 is made up of Cu2+ and SO4- ions bound by a strong force of attraction. The thermal energy at room temperature is only 0.03 eV per molecule which is not enough to dissociate CuSO4 into Cu2+ and SO4- ions (This is an example for chemical binding).
When CuSO4 is dissolved in water, the force of attraction is greatly reduced because of the high dielectric constant (= 81) of water. Now, CuSO4 can be dissociated completely into Cu2+ and SO4- ions by ionization process. For details refer: (T.Theivasanthi and M.Alagar, “Nano sized copper particles by electrolytic synthesis and characterizations” - International Journal of Physical Sciences –2011- 6(15): 3662-3671. http://www.academicjournals.org/article/article1380709619_Theivasanthi%20and%20Alagar.pdf )
Likewise, while you add a chemical binder (instead of water) on a photocatalyst like TiO2 (instead of CuSO4), it will affect the chemical bonds / attraction between Ti and O2 ions.
Dear Theivasanthi
The chemical bonds in solid CuSO4 are ionic but not electrostatic. The dissociation of salts in water is driven by high hydration energy of ions. Your Scheme in eq 1-3 in your publication is wrong. It's not consistent with basics of chemistry/electrochemistry. In order to form Cu(0) in your process something should be oxidized. The most probably, water is oxidized to O2 on anode.
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