Generally -OH group required to couple Fe3O4 with APTES or other silane group.
Dear Vikas Yadav, are you intending to coat Fe3O4 with silane, or any other hydrophilic shell? My Regards
Dear sir Abdelkader BOUAZIZ, I want to coat it with SiO2 and then with silane (APTES/APTMS).
Dear Vikas Yadav, you find almost everything in the attached files. Also I advise you to search within RG for similar questions, other documents are availabale. My Regards
Dear Vikas Yadav many thanks for your interesting technical question. The preparation oh hydrophilic magnetite (Fe3O4) nanoparticles is surprisingly easy. They can be prepared by a simple co-precipitation method using a mixture of FeCl2 and FeCl3 with NaOH in water. In addition to the valuable references provided by Abdelkader BOUAZIZ please also have a look at the following relevant article. The first article described in detail the synthesis of surface-functionalized magnetite NPs using APTES or MPTES:
1. Preparation and Magnetic Comparison of Silane-Functionalized Magnetite Nanoparticles https://myukk.org/SM2017/sm_pdf/SM809.pdf
This article can be freely downloaded from the general internet.
2. Functionalization of Fe3O4 NPs by Silanization: Use of Amine (APTES) and Thiol (MPTMS) Silanes and Their Physical Characterization
This paper is available Open Access (see attached pdf file)
3. Surface modification of Fe3O4@SiO2 microsphere by silane coupling agent
Article Surface modification of Fe3O4@SiO2 microsphere by silane cou...
This article describes the two-step preparation of Fe3O4@SiO2 core–shell microspheres. The paper is freely available as public full text on ResearchGate.
As mentioned by Abdelkader BOUAZIZ there are many more research papers on this topic available.
Dear Frank T. Edelmann , Abdelkader BOUAZIZ ,
Is it make any difference while taking anhydrous salt of Fe2+ and Fe3+ in the synthesis of Fe3O4?
best regards.
Dear all, what is important is the ratio Fe+2/Fe+3, i.e., calculation should consider whether hydrated or anhydrous starting reactants. Other influence is the crystal nature of the starting reactants. Please check details in the following RG threads. My Regards
https://www.researchgate.net/post/Coprecipitation_of_Fe3O4
https://www.researchgate.net/post/What_is_the_reason_for_considering_12_ratio_of_iron_precursors_materials_for_making_iron_oxide_nanoparticles2
Hi;
As mentioned by Frank T. Edelmann the process of chemical co-precipitation of FE (II) and Fe (III) in alkaline solution is widely used for the preparation of magnetite because of its simplicity, reproducibility and possibility to prepare magnetic nanoparticles on a large scale. Particles with sizes ranging from 5 to 10 nm can be obtained using this method. The molar ratio of Fe (II)/Fe (III) is generally equal ½. The size can be controlled by the synthesis conditions: temperature, pH, ionic strength, iron ion concentrations, Fe(III)/Fe(II) ratio, the nature and concentration of the base. Other methods of Fe3O4 synthesis include: thermal decomposition of metal precursors, hydrothermal and hydrothermal synthesis, microemulsion and sol-gel method.
Organosilane surface modifiers with terminal groups (OH, SH and NH2) have been extensively studied for the preparation of functionalized nanoparticles. The surface decoration of nanoparticles can be carried out on the bare Fe2O3 or on the silica-covered surface. The silica shell provides additional surface hydroxyl which can exacerbate the functionalization of Fe3O4 NPs. Please check the following documents:
With my best regards
Dear Vikas Yadav "Is it make any difference while taking anhydrous salt of Fe2+ and Fe3+ in the synthesis of Fe3O4?": Since the co-precipitation method is done in aqueous solution anyway, it does not make any difference if you use anhydrous FeCl2 and FeCl3 or the hydrated salts. Just use the starting materials which are easier available in your laboratory. As mentioned by Abdelkader BOUAZIZ you only need to adjust the stoichiometry of the starting materials. Cited below is another very simple method for preparation of magnetite nanoparticles via the co-precipitation method. In this work the authors use aqueous ammonia solution for the precipitation of the nanoparticles.
Synthesis and characterization of magnetite nanoparticles via the chemical co-precipitation method
Article Synthesis and characterization of magnetite nanoparticles vi...
Dear all, the only factor that may influences the kinetics between hydrated and anhydrous salts is their solvability. They may have different solvation character or speed, it is to be checked. My Regards
Hi;
Please see the links below:
https://doi.org/10.1021/nl015681q
https://doi.org/10.1021/jp900868d
https://doi.org/10.1016/j.colsurfa.2005.04.009
https://doi.org/10.1088/1757-899X/367/1/012010
http://dx.doi.org/10.1016/j.cej.2013.04.060
With my best regards
Dear all, I had prepared Fe3O4 by using anhydrous FeCl3 and FeSO4.7H2O and confirmed with IR-spectroscopy. when I tried to coat it with APTES/APTMS in 2:1 ethanol:water or in absolute ethanol not getting silane coated Fe3O4.
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