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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Tracking Amorphous Precursor Formation and Transformation during Induction Stages of Nucleation.

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Hydroxyapatite (HAP) formation in bone and teeth involves a new nucleation pathway. Amorphous precursors transform through distinct phases, revealing insights into hard tissue development and biomaterial design.

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Area of Science:

  • Biomineralization
  • Materials Science
  • Biochemistry

Background:

  • Hydroxyapatite (HAP) is crucial for bone and tooth formation.
  • Its nucleation mechanism has remained largely unknown.
  • Understanding this process is key for biomaterial development.

Purpose of the Study:

  • To elucidate the nonclassical nucleation mechanism of hydroxyapatite.
  • To investigate the transformation of amorphous precursors in HAP formation.
  • To gain insights into hard tissue formation in vivo.

Main Methods:

  • Utilized a combination of conductance and potentiometric techniques.
  • Monitored calcium-phosphate mineral formation during nucleation.
  • Analyzed ion dehydration rates to understand precursor behavior.

Main Results:

  • Identified nonequilibrium calcium-deficient clusters due to differential ion dehydration rates.
  • Characterized the formation of calcium-deficient amorphous phase I and its transformation to amorphous phase II.
  • Observed precritical nuclei formation within amorphous phase II, preceding mineral precipitation.

Conclusions:

  • The study reveals a novel, nonclassical nucleation pathway for hydroxyapatite involving amorphous precursor transformation.
  • This mechanism provides critical insights into biomineralization processes in hard tissues.
  • Findings advance the design and fabrication of novel biomaterials for bone and tooth regeneration.