My research in March:

My research in March:
Samples prepared from alloys (cast during previous month) has been prepared by standard metallographic procedures for SEM and XRD evaluation. Samples for optical microscopy have been etched in a solution of acetic picral to reveal grain boundaries. SEM (FEI E-SEM XL30) has been used to confirm chemical composition of the samples (EDS) and to observe the microstructure. XRD has been performed to examine the phases in the as-cast alloys. EDS analysis has confirmed the composition of the alloys. X-ray diffraction examination have revealed the presence of α-Mg phase and the probability of the presence of Mg6Ca2Zn3 phase in ternary alloys.

In March while I was nursing my broken right hand (unfortunate fall on a ski slope, which I attempted to challenge perhaps too ambitiously) our research continued. Few samples were sent away for VSM (Vibrating Sample Magnetometer) examination. This method will allow us to study the magnetic properties of our alloys with a particular bias on their magnetocaloric behavior. This nowadays is a hot potato subject. Novel magnetocaloric materials I mean. They are a promising alternative to environment unfriendly and ozone layer harmful Freons commonly utilized for present refrigeration systems. During march as Easter was promptly approaching I studied the annealed and quenched materials by means of optical microscopy. I observed microstructures typical for martenistic phase, which constitutes a direct proof that the martensitic transformation from a higher symmetry parent phase to a lower symmetry marteniste phase takes place in the studied alloys.

Main studies carried out during February:

- microhardness measurements of the melt spun ribbons in the as- cast state and after annealing at different temperatures,
- preparation of new pentanary alloy,
- phase composition analysis of quaternary alloys with silicon and copper addition by SEM,
- XRD analysis of quaternary ingot with molybdenum addition,
- analysis of the results obtained so far,
- participation in seminars and lectures,
- preparation of an abstract for the conference ISMANAM 2012

During last 3 months I was trying to find solution in case of silver nanoparticles deposition. Due to hydrophobic properties of titanium dioxide surface, spin caoting deposition isn't very efective. I tried also to mixed coloidal solution with some alcohols to increase wettalbilty or let the drop of coloidal solution evaporate , but this way didn't slove the problem of to small number of deposited particles. The resolution heve been found by putting sample into to coloidal solution and leave it for about 15 minutes. At that time particles has fallen on the sample surface. This experiment has shown increase of density of particles on the surface. But still a lot of work has to be done to extract disired structure. Naw I am starting the simulation stage as well. By computer simulation I will studding interactions of plasmonic strukctures and light.

My research in February:



Table above presents all types of bioresorbable magnesium alloys, which were cast in February.
These alloys were produced in argon atmosphere in 750 C. I also focused my interest on theoretical background of TEM studying Introduction to Conventional Transmission Electron Microscopy written by Marc De Graef.