I have powder of nano-hydroxyapatite with average particle size of 100 nm. I want to find the poisson's ratio of nano-hydroxyapatite.
Poisson's ratio {\displaystyle \nu }📷 (nu) is a measure of the Poisson effect, that describes the expansion or contraction of a material in directions perpendicular to the direction of loading. The value of Poisson's ratio is the negative of the ratio of transverse strain to axial strain. For small values of these changes, {\displaystyle \nu }📷 is the amount of transversal expansion divided by the amount of axial compression. For nano hydroxyapatite the Poisson ratio was in the range 0.40–0.42 and was generally lower for POM/HAp nanocomposites with higher HAp loading due to good adhesion between POM and HAp that hinders the movements of macrochains and restricts deformation under force.
Thanks scientist Tarafdar.
I will be very regard, if you can suggest me some instrument to find poisson's ratio of nano-particles or some reference of this information.
Dear Dr. Nishant Verma ,
Hydroxyapatite [Ca10(PO4)6(OH)2] which is s form of calcium phosphate is chemically and structurally similar to mineral phase of bone.
Poisson ratio of HA is 0.27 very close to that of Bone 0.3, as shown in the following reference:
Joon B. Park, Joseph D. Bronzino, Biomaterials, Principles ansd Applications (CRC Press, 2003), 1-20.
Best regards, Pierluigi Traverso.
@ Nishant, the most reliable approach to determine this ratio is direct measurement using a strain measuring device on a test specimen of uniform cross-section. The use of bonded strain gages is an extremely accurate technique, but can be time intensive.
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