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Questions related from Alain Celzard
When compressed, hyperelastic materials such as non-woven textiles produce monotonous stress-strain curves, i.e., in which no linear part can be identified. In such conditions, is it meaningful to...
11 June 2017 9,618 25 View
With the aim of preparing supported carbon membranes, we are looking for samples of porous alumina in the form of small plates (max 4 cm x 4 cm), with a very smooth surface, and having...
02 March 2017 7,746 3 View
It is well-known that the speed of acoustic waves in solids can bring useful information on the involved elastic moduli, whether longitudinal or transverse waves are used, therefore giving access...
13 April 2016 1,100 18 View
Whereas different models are commercially available for measuring the permeability of flat materials (such as textiles) to air, I am not convinced that the same equipments can do the same for...
14 February 2016 9,898 3 View
AFM is sometimes said to be a "machine for visualizing artefacts" (heard from an AFM supplier !!), so are there any well-known methods for avoiding seeing artefacts as much as possible ? I believe...
28 June 2015 4,820 15 View
Most carbon phases are anisotropic, and therefore their Raman spectra are sensitive to polarisation of light. Besides, the gratings don't have exactly the same response when light is polarised or...
08 March 2015 9,490 6 View
“Quenching” and “zapping” are the two usual methods for opening the cells of PU foams, thus leading to reticulated foams. Quenching corresponds to a chemical edging in caustic soda, whereas...
02 August 2014 5,046 4 View
I have a Horiba XPlora Raman spectrometer equipped with 3 lasers: 532, 638 and 785 nm. 532 nm burns the wood samples, even at 0.1% of its power, and gives unexploitable spectra. 638 nm laser may...
09 June 2014 8,860 21 View
There are hundreds of papers about Raman spectroscopy of carbon materials, whether the latter are graphites, disordered or diamond-like carbons, CNTs, graphene, etc. Therefore, to avoid missing...
16 February 2014 9,242 8 View
We are working on solid foams. Micro-tomography gives very nice pictures, but what we need is getting quantitative information from them : surface area, distributions of cell sizes, window size...
06 February 2014 8,445 68 View
Spirals of fused silica have been extensively used in old thermobalances, because of the extremely low expansion coefficient of silica. Explanations or links towards how these objects were...
22 December 2013 2,116 6 View
