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A VEDA simulation on cement paste: using dynamic atomic force microscopy to characterize cellulose nanocrystal distribution

Published online by Cambridge University Press:  24 July 2017

Yizheng Cao  and
Kho Pin Verian
Yizheng Cao*
Affiliation:
SSCI, Albany Molecular Research Inc., West Lafayette, IN 47906, USA
Kho Pin Verian
Affiliation:
Solidia Technologies, Piscataway, NJ 08854, USA
*
Address all correspondence to Yizheng Cao at yizheng.cao@amriglobal.com
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Abstract

Cellulose nanocrystal (CNC) enhances mechanical performance of cement composites via short-circuit diffusion (SCD). CNCs transport water along their hydrophilic surface into the unhydrated cement cores to induce extra hydration. It is important to characterize CNC distribution because it determines the SCD pathways. This study for the first time, employs virtual environment dynamic atomic force microscopy, an atomic force microscopy computational tool to investigate CNC distribution in both fresh and hardened cement pastes. The methods not only provide insights in a static context (hardened sample), but also offer opportunities to evaluate the interaction of CNCs with calcium-silicate-hydrate growth during the kinetic early ages of hydration.

Keywords

ω, real-time frequencyωd, driving frequencyωn, natural frequencyω0, resonant frequency of the oscillator in vacuumρ, densityη, viscosityK, constant for a given cantileverp1, p2, q1, q2, q3, q4, fitting coefficientsC, CNC concentration
Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 3 , September 2017 , pp. 672 - 676
Copyright
Copyright © Materials Research Society 2017 

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