(508b) Accurate Simulation of Oxides and Hydroxides up to the Large Nanometer Scale
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Engineering Sciences and Fundamentals
Development of Intermolecular Potential Models
Wednesday, October 31, 2018 - 12:48pm to 1:06pm
The simulation of oxides, mixed oxides, and hydroxides is important to guide in the design of cement, ceramics, and glasses. Here we introduce an extension of the Interface force field (IFF) for several oxides and hydroxides (NiO, α-Fe2O3, α-Cr2O3, α-Al2O3, SiO2, CaO, Ni(OH)2 and Ca(OH)2) using a nonbonded-only potential that involves Coulomb and Lennard-Jones terms. Care is taken that the atomic charges remain close to verifiable internal dipole moments even though covalent bonding contributions are disregarded. The non-bonded models are inherently reactive, enabling changes in morphology and defects. All models achieve quantitative agreement with experiment in lattice parameters (<1% deviation) and in bulk modulus (<10% deviation). They are fully compatible with existing parameters for other oxides, metals, solvents, and polymers following the IFF protocol. The parameters are available using both 12-6 and 9-6 Lennard-Jones potentials to achieve compatibility with CHARMM, CVFF, AMBER, OPLS-AA, PCFF, and COMPASS.