Immobilization of mesoporous silica particles on stainless steel plates
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A preliminary study aimed to the nano-engineering of stainless steel surface is presented. Aminopropyl-functionalized mesoporous silica is covalently and electrostatically anchored on the surface of stainless steel plates. The anchoring is carried out through the use of a nanometric spacer, and two different spacers are proposed (both below 2 nm in size). The first sample is obtained by anchoring to the stainless steel amino functionalized, a glutaryl dichloride spacer. This specie forms an amide linkage with the amino group while the unreacted acyl groups undergo hydrolysis giving a free carboxylic group. The so-obtained functionalized stainless steel plate is used as substrate for anchoring derivatized mesoporous silica particles. The second sample is prepared using 2-bromo-methyl propionic acid as spacer (BMPA). Successively, the carboxylic group of propionic acid is condensed to the aminopropyl derivatization on the external surface of the mesoporous silica particle through covalent bond. In both cases, a continuous deposition (coating thickness is around 10 μm) is obtained, in fact, XPS data do not reveal the metal elements constituting the plate. The nano-engineering of metal surfaces can represent an intriguing opportunity for producing long-term drug release or biomimetic surface.
KeywordsSBA-15 Mesoporous silica Functional mesoporous silica Stainless steel functionalization Nano-engineering
The authors thank Dr. Daniela Perrotta e Dr. Mariano Davoli (DIBEST Department, University of Calabria, Italy) for TEM and SEM analyses, respectively.
Compliance with ethical standards
This study was partially funded by the NaPRest project (Nanotechnologies for the Prevention of Restenosis), founded in part by the Italian Ministry of Health.
Conflict of interest
The authors declare that they have no conflict of interest.
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