Periodic Reporting for period 1 - MAGDEx (Unmet MAGnetic properties in micro and nano-particles by synthesis through gas-diffusion electrocrystallisation (GDEx))
Reporting period: 2018-04-01 to 2020-03-31
RO.1: To elucidate the processing conditions of GDEx in which single-phase HBST and CACT are produced.
RO.2: To optimize the processing conditions of GDEx and electrochemical cell setup for the high-yield synthesis of Zn4-xCux(OH)6Cl2 at faster rates than state-of-the-art technologies.
RO.3: To optimize the processing conditions of GDEx to achieve the unmet micro and nano particles of Zn4-xCux(OH)6Cl2.
RO.4: To obtain stable colloidal dispersions of Zn4-xCux(OH)6Cl2 nanoparticles in water.
RO.5: To obtain highly promising and well-controlled magnetic properties (measured as per the magnetic susceptibility) linked to the micro and nano-dimensioned Zn4-xCux(OH)6Cl2 particles.
RO.6: To explore the formation of thin-films of HBST and CACT over conducting substrates by electrophoretic deposition.
which were addressed in the following work packages:
Work Package 1: Study of the GDEx formation of HBST, CACT and paratacamite (M1-M18)
Work Package 2: Manipulation of HBST, CACT and paratacamite nanocrystals properties (M10-M18)
Work Package 3: Dispersions vs electrophoretic deposition (M10-M18)
Work Package 4: Magnetic susceptibility control (M18-M24)
Two patents, co-authorship in 4 peer-reviewed publications, one book chapter, participation in five international conferences, two dissemination activities, three training activities, and participation in thee workshops including one annual conference.
The magnetic properties, particle size and rate of the reaction can be precisely tuned (directly or indirectly) by manipulating the charge consumption, as well as the composition of the electrolyte.
The project results were in accord with recent studies of synthesis of spin transition compounds indicating that the presence of Zn allowed the perfect kagomé distribution of the Cu2+ ions and consequently lead the absence of long-range ordering to the lowest measured temperature. We finally contributed to the state of the art, demonstrating that the spin liquid behavior was sustained at the nanoscale in compounds of ZnCu3(OH)6Cl2. Our discovery not only confirmed redox reactions as the driving force to produce spin transition nanoparticles, but also proved a simple way to switch between these magnetic ground states within an electrochemical system, paving the way to further explore its reversibility and overarching implications.