Dynamic Impact Absorption Behaviour of Glass Coated with Carbon Nanotubes 261
was nearly 500 MPa, which was still about 30% higher
than pure glass but much less than 0.1 mg and 0.2 mg.
The reason for this reduction can be the increased thick-
ness of coating that comprises of multiple layers of
MWCNTs.
As layers of coatings increase, there is slipping of these
layers from the glass surface and amongst the layers
themselves. As a result, the coatings slip away from the
base glass surface and fail to offer higher resistance to
impact.
On the basis of the results obtained in this work, it
seems safe to conclude that coating by small concentra-
tions of MWCNT improves the dynamic impact strength
of glass.
It not only helps modify glass strength, but also is a
useful impact stress sensor. In fact, a stacking of multiple
coated glass samples can be used to absorb desired im-
pact as well as sensing unit for such impacts. As the glass
piece was covered with minor amounts of MWCNTs, the
transparency loss was not significant.
5. Acknowledgements
Prashant Jindal gratefully acknowledges financial sup-
port from the Defence Research Organization (DRDO)
for a research project (No. ARMREB/DSW/2011/129).
He also acknowledges the Director, TBRL and the whole
team of Gun Group for extending their lab facilities. Gui-
dance provided by Biomoluecular Electronics and Nano-
technology Division (BEND), at Central Scientific Instru-
ments Organisation (CSIO), Chandigarh is also acknowl-
edged. He is also grateful to Mr. Hitesh Sharma from Ac-
curate Optics, Chandigarh for assistance in providing base
material. Dr. Rajesh Kumar, UIET, Panjab University,
Chandigarh assistance is also acknowledged.
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