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Questions related from Lebohang Macheli
I have modified a sample with two different materials. The other results in a positive shift in the BE of the 2p peaks while the other results in a negative shift. what do this shifts mean?
04 October 2017 7,520 13 View
Is there a difference between crystallite size and particle size? If and which one affects catalysis? does TEM give crystallite size or particle size?
12 August 2016 5,877 31 View
I have modified a surface of a metal oxide with different alkoxy agents. the TPR profiles of the modified samples are different. i would like to know if this could be due to the difference in bond...
17 July 2015 3,314 2 View
I have carried out a hydrogen chemisorption experiment and have determined, from the linearized Langmuir isotherm, the volume of hydrogen required for mono layer coverage (i.e 5.5 ml/g). How do I...
16 January 2014 4,746 7 View
How many Co2+ ions are there on the (100) surface of Co3o4 nano-cube unit cell. If I were to modify the surface of the Co3O4 with ligands such as Ti(OBu)4 would the the Co-O-Ti bond be formed...
19 October 2013 6,943 1 View
I have supported Co3O4 over SiC, using different solvents such as acid, water and ethanol. When using ethanol the Co3O4 could not "stick onto the support as seen from TEM", while with water and...
08 October 2013 8,068 3 View
1. If I have a sample of a nanosized material and modify its surface with some ligands [e.g. Ti(OCH2CH2CH3)4] and do EDS on the modified sample, is the elemental ratio correspond the ratio of...
10 August 2013 6,930 10 View
How can Activation Energy be calculated from a TPR profile data of a sample treated at constant heating rate. Does a shift in a TPR peak imply change in activation energy if the shift occurs at...
20 June 2013 455 9 View
20 June 2013 7,385 2 View
