Publications de Matthew David Witman

Sim-to-real transfer reinforcement learning for control of thermal effects of an atmospheric pressure plasma jet

Applications of atmospheric pressure plasma jets (APPJs) present challenging feedback control problems due to the complexity of the plasma-substrate interactions. The plasma treatment of complex substrates is particularly sensitive to changes in the physic ...

2019

Ab Initio Flexible Force Field for Metal-Organic Frameworks Using Dummy Model Coordination Bonds

Berend Smit, Seyedmohamad Moosavi, Matthew David Witman, Sudabeh Jawahery, Nakul Rampal

We present force fields developed from periodic density functional theory (DFT) calculations that can be used in classical molecular simulations to model M MOF-74 (M = Co, Fe, Mg, Mn, Ni, Zn) and its extended linker analogs. Our force fields are based on c ...

2019

Simulating Enhanced Methane Deliverable Capacity of Guest Responsive Pores in Intrinsically Flexible MOFs

Berend Smit, Matthew David Witman

A novel computational procedure, based on the principles of flat-histogram Monte Carlo, is developed for facile prediction of the adsorption thermodynamics of intrinsically flexible adsorbents. We then demonstrate how an accurate prediction of methane deli ...

AMER CHEMICAL SOC2019

Cutting Materials in Half: A Graph Theory Approach for Generating Crystal Surfaces and Its Prediction of 2D Zeolites

Berend Smit, Peter George Boyd, Senja Dominique Barthel, Matthew David Witman

Scientific interest in two-dimensional (2D) materials, ranging from graphene and other single layer materials to atomically thin crystals, is quickly increasing for a large variety of technological applications. While in silico design approaches have made ...

2018

Flat-Histogram Monte Carlo as an Efficient Tool To Evaluate Adsorption Processes Involving Rigid and Deformable Molecules

Berend Smit, Matthew David Witman

Monte Carlo simulations are the foundational technique for predicting thermodynamic properties of open systems where the process of interest involves the exchange of particles. Thus, they have been used extensively to computationally evaluate the adsorptio ...

2018

Rational Design of a Low-Cost, High-Performance Metal-Organic Framework for Hydrogen Storage and Carbon Capture

Berend Smit, Kyriakos Stylianou, Andrzej Gladysiak, Matthew David Witman

We present the in silico design of a MOF-74 analogue, hereon known as M-2(DHFUMA) [M = Mg, Fe, Co, Ni, Zn], with enhanced small-molecule adsorption properties over the original M-2(DOBDC) series. Constructed from 2,3-dihydroxyfumarate (DHFUMA), an aliphati ...

2017

The Influence of Intrinsic Framework Flexibility on Adsorption in Nanoporous Materials

Berend Smit, Peter George Boyd, Matthew David Witman, Sudabeh Jawahery

For applications of metal-organic frameworks (MOFs) such as gas storage and separation, flexibility is often seen as a parameter that can tune material performance. In this work we aim to determine the optimal flexibility for the shape selective separation ...

2017

Force-Field Prediction of Materials Properties in Metal-Organic Frameworks

Berend Smit, Seyedmohamad Moosavi, Peter George Boyd, Matthew David Witman

In this work, MOF bulk properties are evaluated and compared using several force fields on several well-studied MOFs, including IRMOF-1 (MOF-5), IRMOF-10, HKUST-1, and UiO-66. It is found that, surprisingly, UFF and DREIDING provide good values for the bul ...

2017

Adsorbate-induced lattice deformation in IRMOF-74 series

Berend Smit, Cory Matthew Simon, Matthew David Witman, Efrem Daniel Braun, Davide Tiana, Sudabeh Jawahery

IRMOF-74 analogues are among the most widely studied metal-organic frameworks ( MOFs) for adsorption applications because of their one-dimensional channels and high metal density. Most studies involving the IRMOF-74 series assume that the crystal lattice i ...

Springer Nature2017

Accurate Characterization of the Pore Volume in Microporous Crystalline Materials

Berend Smit, Daniele Ongari, Peter George Boyd, Senja Dominique Barthel, Matthew David Witman

Pore volume is one of the main properties for the characterization of microporous crystals. It is experimentally measurable, and it can also be obtained from the refined unit cell by a number of computational techniques. In this work, we assess the accurac ...

American Chemical Society2017