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Precipitation Processes

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...

Washing, Drying, and Ignition of Precipitates

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...

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Temperature driven morphological changes of chemically precipitated hydroxyapatite nanoparticles.

R Kumar, K H Prakash, P Cheang

Langmuir : the ACS Journal of Surfaces and Colloids

|July 1, 2005

Summary

This summary is machine-generated.

Hydroxyapatite (HA) synthesis via wet chemistry is temperature-dependent. Higher temperatures yield spheroidal HA particles, while lower temperatures produce needle-shaped ones, driven by reactant supersaturation.

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Area of Science:

Materials Science
Inorganic Chemistry
Biomaterials Engineering

Background:

Hydroxyapatite (HA) is a crucial biomaterial, often synthesized using wet chemical methods.
Controlling HA particle morphology is vital for its applications in bone regeneration and dental implants.
This study investigates the influence of precipitation temperature on HA synthesis using calcium hydroxide and ortho-phosphoric acid.

Discussion:

X-ray diffraction confirmed HA as the primary phase (>99%), with minor beta-tricalcium phosphate, irrespective of temperature.
Fourier transform infrared spectroscopy revealed carbonate substitution in HA, decreasing as temperature increased from 40 to 100°C.
Transmission electron microscopy showed a distinct morphology transition from needle-shaped at 40°C to spheroidal at 100°C.

Key Insights:

Precipitation temperature significantly impacts hydroxyapatite morphology, transitioning from high-aspect-ratio needles to spheroids.
Increased temperature leads to reduced carbonate substitution within the HA lattice.
The supersaturation level of reactants, particularly Ca2+ ions, is identified as the primary driver for morphology changes.

Outlook:

Understanding the role of supersaturation offers a pathway to tailor HA particle morphology for specific biomedical applications.
Further research could explore optimizing synthesis parameters to achieve desired HA crystal structures and morphologies.
This work provides foundational knowledge for designing advanced HA-based biomaterials.