In July I continue potentiostatic deposition of Zn-Mo layers from the following citrate solutions :
1) 0,65 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
2) 0,45 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
3) 0,45 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4; pH=5
4) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
5) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4; pH=5
6) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,08 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
7) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,04 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
8) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,02 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
9) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
10) 0,25 M Na3HCit + 0,08 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
11) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,04 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
12) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,08 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
13) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,08 M SnSO4; pH=5
14) 0,25 M Na3HCit + 0,08 M ZnSO4 + 0,16 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
with the following parameters:
-potential of a working electrode:
E1= -1,2 V
E2= -1,25 V
E3= -1,3 V
E4= -1,35 V
E5= -1,4 V
E6= -1,45 V
E7= -1,5 V
E8= -1,6 V
E9= -1,7 V
E10= -1,8 V
E11= -1,9 V
E12= -2,0 V
E14= -2,2 V vs.SCE
-rotating disc electrode speed:
ω1= 16 rad/s
ω2= 40 rad/s
ω3= 68 rad/s
-charge:
Q1= 25 C
Q2= 50 C
Q3= 100 C
Q4= 150 C
Q5= 250 C
Next the chemical composition of electrodeposits were characterised by the Wavelength Dispersive X-ray Fluorescence method (WDXRF), and the Glow Discharge Optical Emission Spectroscopy method (GDOES). Next I prepare, among others, partial polarizaion curves for the Zn, Mo ,H co-discharge.

Main activities and studies carried out during July:

- Preparing samples for microharness measurements
- Microhardenss measurements
- Samples investigations with Cu using TEM
- Tensile tests for ternary alloy and alloy with Mo addition
- Writing an abstract for the 9-th Polish-Japanese Joint Seminar on Micro and Nano Analysis

During last month I was investigating the influence of high energy ball milling on a morphology and mechanical properties of a 7475 aluminium alloy powder and AA7475/AlN composite powders in order to determine an optimal milling time for each composition. To achieve that I decided to investigate milled powders after 10, 20, 30, 40 and 50 hours of ball milling using optical microscopy, x-ray difractometry and microhardness tests.
I also made an attempt to mill my powders with liquid nitrogen addition.

This month I have been trained in preparation of thin films on the observations in the transmission electron microscope (TEM).
I continued research with AA3004 aluminium alloy. I prepared new samples - samples pre-deformed by ECAP were annealed at 265°C and 280°C because in range from 250°C to 300°C was observed rapid grain growth (recrystalization occur).

Splash!!! I wish it had been me that jumped into cold blue water…Ehh, instead that I had an additional work…my freshly prepared buffer was spilled on a lab floor...it’s quite difficult to focus on important things when outside is the middle of summer. Anyway, opportunity to work in the lab with an air condition had convinced me to continue my science adventure in July. It was good time for reading papers because was really quite everywhere in the Institute. Moreover I carried out studies on diffusion phenomenon within cross-linked and non cross-linked polyelectrolyte multilayer films. I prepared samples for strength tests and for SEM analysis. I’ve started studies of endothelial and smooth muscle cells growth kinetics on PLL/HA films.