I tried to bind urea with my hydroxyapatite, but XRD does not confirm it (peaks for urea was not found in the urea-HAp ) nanohybrid.
I tried to sonicate the HAP dispersion using a bath type, should I use a probe-type sonicator in dispersing the Hap instead?
Or should I adjust the urea-Hap loading of my sample?
Or was the urea solution not saturated enough before adding Hap?
The methodology is as follows:
Urea-HA nanohybrids will be synthesized following (Kottegoda et at., 2011) using a wet chemical method.
- Obtain an amount of (25 g) synthesized HA nanoparticles as described above and dispersed them in distilled water (100 ml) under ultrasonic mixing (30 kHz for 1 hour or 45 mins).
- Stir the resulting HA nanoparticle dispersion in a saturated urea solution (100 ml) or 150 g urea in 100 mL distilled water at 25°C for 12 h.
Scale up: 25g:150g = 1:6 urea to Hap loading
Scale down: 5 g: 30 g =1:6 urea to Hap loading
- Wash the product thrice with distilled water to remove excess urea, and dry at 50°C for 7 h.
- Then place the synthesized Urea-hydroxyapatite nanohybrid in a Petri dish or air-tight container.
There could be several reasons why urea did not bind with hydroxyapatite in your preliminary experiment. Here are some possible explanations:
La plus grande interaction que peut avoir la HA avec l'urée et celle de l'action entre un azote cationique de l'uree et le OH de la HA. Si ton pH est basique il peut avoir répulsion, de plus, le phosphore et dans la même période que l'azote
The greatest interaction that HA can have with urea is that of the action between a cationic nitrogen of urea and the OH of HA. If your pH is basic it can have repulsion, moreover, phosphorus and in the same period as nitrogen
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