Molecular trick opens the door to a new generation of glass

A team of researchers from TU Dortmund University, Paderborn University, the University of Duisburg-Essen, and the University of Oxford have discovered a method to modify the internal structure of specific types of glass during the manufacturing process. Published in the journal Nature Materials, the study describes how adding an organic molecule called 1,10-phenanthroline to molten metal-organic framework precursors can reduce melting temperatures, prevent decomposition, and allow for precise tuning of magnetic and optical properties.

Dr. Sebastian Henke, the lead researcher from TU Dortmund University, explains that this new technique enables the development of specialized glasses that were previously impossible to achieve without destroying the material through extreme heat. The organic molecule enters into a reaction with the metal atoms in the glass, altering their chemical bonds and coordination environment. By adjusting the dosage of the molecule, researchers can control the extent of the restructuring of the glass network.

The process involves mixing phenanthroline with the starting materials before heating. Once molten, the substance acts as both a flux, lowering the melting temperature, and a chemical agent, binding directly to the metal atoms and displacing old bonds. This technique prevents the formation of harmful decomposition products and maintains the stability of the material, even at lower temperatures.

The researchers tested their method on cobalt-containing glasses and successfully demonstrated that the gentler process limits decomposition while preserving the pure magnetic effects of the glass. They employed high-resolution measurement methods, such as X-ray absorption spectroscopy, to confirm the structural changes in the glass.

The study also revealed that the process is not limited to a single class of materials and can be applied to carboxylate-based frameworks, expanding the possibilities for manufacturing these specialized glasses.

Henke summarizes the potential applications of this discovery, stating that the melt can now be considered a reaction space where the structure can be programmed. This control opens up new avenues for the development of components that precisely control light, magnetism, or chemical reactions, with potential uses in catalysis, sensors, and optoelectronics.