Hello, What i think is important to pay attention to when working with core-shell materials, is first, to make sure that you control the size, form and compostion of the core and shell materials, the synthesis method must be controllable to have a uniform and homogeneous core-shell structures to easily optimize the desired properties. Another aspect is to use TEM, XRD and Raman characterization techniques to confirm the size and composition of the core-shell nanoparticles. And at the end explore carefully the potential of the synthesized matherial for specific application without forgeting the form of the material.
To form the shell on a core, a good distribution of the particles that will function as nucleation sites for the formation of the shell is necessary. If there is a low availability of particles, these nucleation sites will be too far apart on the core surface and therefore will not coalesce into a complete shell. In contrast, an excessive amount of particles tends to form bumps so that a homogeneous and smooth shell would not be obtained. Care must also be taken that the functionalizing agent for the bonding of these particles to the core does not polymerize, forming unwanted bonds between the cores and thus core-shell agglomerations. It should be remembered that the morphology of the shells will also depend on the morphology of the core or sacrificial template.
Hello Ali, the most essential advice for preparing the nanoparticle core-shell is that the core should be made of magnetized elements: iron, cobalt, and nickel. This keeps them fused as a capsule for as long as possible. And this is when the core and shell are elements, but if the core is a polymer or an antibiotic. Here the situation changes. This does not mean we cannot use non-magnetic elements as a core. On the contrary, it is possible, but the connection period is short..
My greetings
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