Does anyone knows and could give us the steps for how can make SiO2 nanoparticles as a coating on BFRP bar
@Azzam
if you want coat Sio2 nanoparticles on the fiber you make suspension on any binders and then use spray method or direct immersion method to deposit the Sio2 nanoparticles/binder onto fibers following by dry the fibers on an oven but in this case you should consider the compatibility between the binder and your matrix .you can use any polymer as binder that can be compatible with the matrix
@Azzam
if you want coat Sio2 nanoparticles on the fiber you make suspension on any binders and then use spray method or direct immersion method to deposit the Sio2 nanoparticles/binder onto fibers following by dry the fibers on an oven but in this case you should consider the compatibility between the binder and your matrix .you can use any polymer as binder that can be compatible with the matrix
Hello Dr Azzam,
For BFRP (basalt fiber reinforced polymer ) bar , you need to create an interaction between the bar and the particle.
Hence, according to its chemical composition you can try using dilute acid to make surface activation of the bar. Immerse the bar in dilute HCL for few minutes or optimize the time to make sure the presence of surface function groups. Second, immerse the activated bar in TEOS/NaOH to make insitu Sol-Gel on the bar. Another way , after activation , use spray coating over the by dispersing the SiO2 in a polymeric solution and spray it on the bar like spray painting with a volatile solvent . Best of luck .
Dear Azzam,
to improve BERP properties by adding silica nanoparticles to epoxy resin. BERP bars that can be explained by non-homogenous distribution of nanosilica particles in matrix.
Hope it is helpful for you.
Ashish
Elwathig. A. M. Hassan Thanks so much dear Dr. Elwathig
About the Silica coating, the surface of the BFRP bar is solid (BF/epoxy), the bar is made of Basalt fiber and epoxy resin using the pultrusion composite process.
I didn't get what you want to do. Do you like to modify fiber before fabrication the composite?
Dear Dr. Elwathig thanks for your kind response, so I don't need to modify fiber before composites fabrication, so my case is already the composites fabricated that is BFRP rebar or bars, need to do surface coating to this BFRP bar to enhancing long-term durability
Dear Dr.Azzam,
I think it is better to make a specific interaction between the fiber and the SiO2 NPs to get strong coating ....This interaction can be adapted by various ways such as creation of suface funcational group on both BFRP (you can make it has OH group) and SiO2 (you can make it has NH2 gp); another method is to make well-dispersed solution of the NPs in a binder polymer and this solution can be easily spread on the fiber ....Physical or chemical bondings are very important to keep NPs/BFRP interphase not to be de-attached ....Best regards and good luck
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