In the synthesis of TEOS coated followed by amine functionalized nanoparticles magnetic nanoparticles using APTES, how to know amine group is functionalized? Is there any specific peak for APTES in FTIR?
You can confirm by FTIR or ATIR, EDX, SEM, TEM and simple elemental analysis of the modified MNPs.
you can see the articles:
Article Preparation and characterization of APTES modified magnetic ...
Article Kinetics of (3-Aminopropyl)triethoxylsilane (APTES) Silaniza...
Article Cholesterol-oxidase-magnetic nanobioconjugates for the produ...
https://jnanobiotechnology.biomedcentral.com/track/pdf/10.1186/1477-3155-9-13?site=jnanobiotechnology.biomedcentral.com
Before the modification your magnetic nanoparticles does not contain any organic group?
Then, after the modification you can monitor the CH2 vibrational bands specific (proportional) to the amount of mono-(aminopropyl) siloxane using HATR-FTIR spectroscopy (similar to the measurements in Article Synthesis and testing of ZnO nanoparticles for photo-initiat...
). To determine the exact amount calibration are necessary (e.g. by TGA).You should also confirm the presence of -NH2 by performing zeta potential measurements Article Functionalized polymer colloids bearing primary amino groups
(before and after the modification with your final target compound).Note that Abdur Rahman correctly used APTES to bond the siloxane layer to the surface of the particles (-NH3+ and negatively charged surface). I suggest that you also use at least in small amount of APTES during the modification with TEOS. The base (R-NH2) will also catalyze the reaction.
Article Analysis of silanes and of siloxanes formation by Raman spectroscopy
This paper might also be interesting.
Article Silane Deposition via Gas-Phase Evaporation and High-Resolut...
Dear Viji
You can simply compare the zeta-potential of your NPs for before and after the growth of silica shell with APTES.
Best Regards
Mohammad
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