Nature Communications study maps nanoparticle segregation in growing calcite crystals
This digest was compiled by AI from multiple sources — links to the originals are below.
Two types of protein-like polymer nanoparticles separated into distinct regions as growing calcite crystals trapped them, according to a study published in Nature Communications. The result is an artificial biomineral with an organized structure driven by differences in the nanoparticles' surface chemistry.
The Synthetic Nanoparticles
Researchers produced two types of diblock copolymer nanoparticles designed to mimic pseudo-proteins. The first type consisted of solid spheres about 100 nanometers in diameter with a poly(benzyl methacrylate) core and a sulfate-containing shell tagged with a red fluorescent dye. The second type consisted of hollow, bubble-like vesicles about 300 nanometers across with the same polymer core but a carboxylate-rich outer shell tagged with a green fluorescent dye. The nanoparticles were synthesized using RAFT polymerization combined with polymerization-induced self-assembly (PISA). Their different sizes and surface chemistries served as tunable stand-ins for natural biomolecules.
Crystal Growth Experiment
The two nanoparticle types were introduced into growing calcite crystals. Instead of mixing randomly, the particles sorted themselves into separate regions inside the crystal. The red-dyed 100-nanometer spheres and green-dyed 300-nanometer vesicles occupied different areas, forming an artificial biomineral with a distinctly organized structure. The segregation was driven by differences in the nanoparticles' surface chemistry. The study, published in Nature Communications, provides a new experimental model for exploring particle partitioning during crystal growth.
Research Gap
Natural biominerals such as bones, teeth, and shells combine hard inorganic minerals with organic molecules into organized hybrid structures. Earlier studies trapped a single type of nanoparticle inside a growing crystal but lacked clear rules for making multiple particle types sort themselves into specific regions. Existing analytical techniques could not reliably untangle overlapping interactions among multiple components at such tiny scales. The new system uses precisely controlled surface chemistries and sizes to track individual components. It fills an experimental gap in understanding nanoparticle partitioning and segregation during biomineralization.
What's Next
Further experiments using the described model are expected to test more complex combinations of nanoparticle sizes and surface chemistries. It remains unclear whether the segregation rules observed in calcite will transfer to other crystal hosts or to practical controlled-release applications.
1 source
Nature Communications study maps nanoparticle segregation in growing calcite crystals
