Why the particle morphological changes during hydrothermal synthesis with change in alkali(KOH) concentration...remaining oxide concentration and temperature and dwell time kept constant...
In my knowledge simple words, at the time of hydrothermal process the particles growth to another morphology. Due the pressure change (if you increase the temperature in the closed container, after some time the pressure will increased gradually) the particle grown in 'c' axial direction. That means 'c' axial growth is an important for morphology formation.
In my suggestion, If you change the growth time you will get different morphologies (like 4h, 5-24h, or 24-96 h).
Many literatures are also available:
10.1039/C1CE06039B
10.1039/C0NR00280A
https://www.tandfonline.com/doi/abs/10.1080/09500839.2016.1144938
https://www.degruyter.com/view/j/znb.2018.73.issue-11/znb-2018-0142/znb-2018-0142.xml?intcmp=trendmd
Article Facile hydrothermal synthesis of actiniaria-shaped α-MnO2/ac...
Thankq.....N. Rajamanickam sir for sparing your time...in my work what I observed is there is not much difference in particle morphology by varying reaction time..only the alkali concentration is a playing a role in morphological changes....
I do not know THE reason for your system, but it is not surprising.
My (very simplified) argument is that ideally a crystal grows in a shape which is most stable in the given environment. That is, the surfaces (i.e. crystal faces or crystal planes) which are more stabilized will develop more. The stability of each surface depends on the crystal structure but also on what is there at the interface, in terms of physico-chemical interaction, T, P etc.
A thing I would consider, for example, is if, on the different surfaces of your different crystal morphologies, there are things that KOH can deprotonate.
Mam ( Arianna Lanza )..My material is KNbO3...from literature I got an idea that concentration of (OH)^- ions has a effect on particle morphology say it like rods or cubes...But what is the exact reason for the change in morphology...
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