Preparation and characterization of porous carbon loaded with iron particles: a possible magnetic carrier of medical drugs

Preparation of magnetically separable mesoporous Co@carbon/silica composites by the RAPET method

“…The integration of magnetic nanoparticles into mesoporous silica or porous carbon can undoubtedly expand the use of magnetic nanoparticles due to the large surface area, tunable porosity and uniform pore size distribution of these porous matrices, [12][13][14][15] therefore, such novel composites, which contain dual functions of mesoporous structure and magnetism, have attracted high attention in adsorption, 16 enzyme immobilization 17 and drug delivery targeting. [18][19][20][21] These multifunctional materials could also be further functionalized by noble or transition metals to obtain desirable catalytic properties. [22][23][24] Carbon coating can endow magnetic nanoparticles, especially the metallic ones, with stability and biocompatibility.…”

“…Usually, magnetic cobalt/mesoporous silica composites can be prepared by a multistep process and the magnetic cobalt nanoparticles are mostly anchored onto the external surface of the mesoporous supports. In order to obtain metallic cobalt nanoparticles encapsulated by porous composites, normally two processes can be applied to fulfil the aim: one is by a presynthesis process to get metallic cobalt nanoparticles, which then can be used in a following loading process; the second one is the post-reduction treatment, cobalt precursors were firstly incorporated into the channels of the porous substrates, and then reduced by using a special reductive agent at high temperatures, such as H 2 gas, 29,30 however, it is difficult to get air-stable metallic nanoparticles by the normal reduction process and an additional step is necessary to protect the air sensitive metallic nanoparticles using an inert layer, for example silica or carbon. In addition, if one wants to get a mesoporous silica based substrate, for example SBA-15, with a non-silica surface, such as SBA-15 with a carbon cover layer, an additional surface modification step and extra carbon source are required, however, homogenous deposition of a carbon layer onto both the internal and the external surfaces, especially the former one, of the SBA-15 particles, are difficult since the mesopores are apt to be blocked during the coating process.…”

Absolute Assessment of Adsorption-Based Porous Solid Characterization Methods: Comparison Methods

“…Nanoporous solids, which we define as those containing micro- and mesopores as defined by IUPAC, are applied across science, engineering, and beyond. Just a few of the more advanced applications are sensors, electrochemical devices, gas storage media, and controlled delivery of drugs . The utility of nanoporous solids in these and many other applications is determined by pore surface chemistry and microtexture, pore geometry, and pore system topology; there is, therefore, a clear need to determine these characteristics.…”

Nanoclusters and nanocluster systems. Assembling, interactions and properties

“…Depending on the duration of the reduction with hydrogen, the size of oxide clusters ranges from 7 to 12 nm, and the size of iron (a-Fe) clusters is 3 ± 7 nm. 137 It is noteworthy that a nanosystem of these clusters possesses a self-forming property: the reduction by hydrogen is accompanied by hydrogenation (carbon burning) accompanied by an increase in the pore size. The size and composition of nanoclusters are also markedly affected by the nature of the carbon surface.…”