Absolute proton hydration free energy, surface potential of water, and redox potential of the hydrogen electrode from first principles: QM/MM MD free-energy simulations of sodium and potassium hydration

2018 ◽  
Vol 148 (22) ◽  
pp. 222814 ◽  
Author(s):  
Thomas S. Hofer ◽  
Philippe H. Hünenberger
Keyword(s):  
Free Energy ◽  
Redox Potential ◽  
Surface Potential ◽  
First Principles ◽  
Energy Surface ◽  
Hydration Free Energy ◽  
Free Energy Surface ◽  
Hydrogen Electrode ◽  
Energy Simulations ◽  
Sodium And Potassium

scholarly journals Exploration of Free Energy Surface and Thermal Effects on Relative Population and Infrared Spectrum of the Be6B11− Fluxional Cluster

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 112
Author(s):  
Carlos Emiliano Buelna-Garcia ◽  
José Luis Cabellos ◽  
Jesus Manuel Quiroz-Castillo ◽  
Gerardo Martinez-Guajardo ◽  
Cesar Castillo-Quevedo ◽  
...  
Keyword(s):  
Free Energy ◽  
Infrared Spectrum ◽  
Infrared Spectra ◽  
Thermal Effects ◽  
Global Minimum ◽  
Energy Surface ◽  
Weighted Sums ◽  
Free Energy Surface ◽  
Temperature Dependent ◽  
Relative Population

The starting point to understanding cluster properties is the putative global minimum and all the nearby local energy minima; however, locating them is computationally expensive and difficult. The relative populations and spectroscopic properties that are a function of temperature can be approximately computed by employing statistical thermodynamics. Here, we investigate entropy-driven isomers distribution on Be6B11− clusters and the effect of temperature on their infrared spectroscopy and relative populations. We identify the vibration modes possessed by the cluster that significantly contribute to the zero-point energy. A couple of steps are considered for computing the temperature-dependent relative population: First, using a genetic algorithm coupled to density functional theory, we performed an extensive and systematic exploration of the potential/free energy surface of Be6B11− clusters to locate the putative global minimum and elucidate the low-energy structures. Second, the relative populations’ temperature effects are determined by considering the thermodynamic properties and Boltzmann factors. The temperature-dependent relative populations show that the entropies and temperature are essential for determining the global minimum. We compute the temperature-dependent total infrared spectra employing the Boltzmann factor weighted sums of each isomer’s infrared spectrum and find that at finite temperature, the total infrared spectrum is composed of an admixture of infrared spectra that corresponds to the spectra of the lowest-energy structure and its isomers located at higher energies. The methodology and results describe the thermal effects in the relative population and the infrared spectra.

scholarly journals The Influence of Starch Origin on the Properties of Starch Films: Packaging Performance

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1146
Author(s):  
Zuzanna Żołek-Tryznowska ◽  
Alicja Kałuża
Keyword(s):  
Tensile Strength ◽  
Free Energy ◽  
Surface Free Energy ◽  
Food Packaging ◽  
Energy Surface ◽  
Free Energy Surface ◽  
Casting Method ◽  
Starch Solution ◽  
Film Properties ◽  
Starch Films

Starch films can be used as materials for food packaging purposes. The goal of this study is to compare how the starch origin influence the selected starch film properties. The films were made from various starches such as that from maize, potato, oat, rice, and tapioca using 50%w of glycerine as a plasticizer. The obtained starch-based films were made using the well-known casting method from a starch solution in water. The properties of the films that were evaluated were tensile strength, water vapour transition rate, moisture content, wettability, and their surface free energy. Surface free energy (SFE) and its polar and dispersive components were calculated using the Owens-Wendt-Rabel-Kaelbe approach. The values of SFE in the range of 51.64 to 70.81 mJ∙m−2 for the oat starch-based film and the maize starch-based film. The films revealed worse mechanical properties than those of conventional plastics for packaging purposes. The results indicated that the poorest tensile strength was exhibited by the starch-based films made from oat (0.36 MPa) and tapioca (0.78 MPa) and the greatest tensile strength (1.49 MPa) from potato.

Efficient approach to include molecular polarizations using charge and atom dipole response kernels to calculate free energy gradients in the QM/MM scheme

2015 ◽  
Vol 17 (40) ◽  
pp. 26955-26968 ◽  
Author(s):  
Toshio Asada ◽  
Kanta Ando ◽  
Koji Sakurai ◽  
Shiro Koseki ◽  
Masataka Nagaoka
Keyword(s):  
Free Energy ◽  
Energy Surface ◽  
Free Energy Surface ◽  
Efficient Approach ◽  
Reaction Processes ◽  
Dipole Response

An efficient approach to evaluate free energy gradients within the QM/MM framework has been proposed to clarify reaction processes on the free energy surface.

scholarly journals Free energy surface of initial cap formation in carbon nanotube growth

2021 ◽  
Author(s):  
Satoru Fukuhara ◽  
Yasushi Shibuta
Keyword(s):  
Carbon Nanotubes ◽  
Free Energy ◽  
Carbon Nanotube ◽  
Energy Surface ◽  
Catalyst Surface ◽  
Important Process ◽  
Free Energy Surface ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Carbon Network

Initial cap formation is an important process of carbon nanotubes (CNTs) growth where hexagonal carbon network is lifted off from the catalyst surface. In this study, free energy surface (FES)...

Surface Free Energy. Surface Tension

W Tungsten ◽  
1993 ◽  
pp. 74-81
Author(s):  
Gerhard Czack ◽  
Gerhard Kirschstein ◽  
Wolfgang Kurtz ◽  
Frank Stein
Keyword(s):  
Surface Tension ◽  
Free Energy ◽  
Surface Free Energy ◽  
Energy Surface ◽  
Free Energy Surface

Exploration of Free Energy Surface of Chiral Be4B8 Cluster at Different Temperatures

2021 ◽  
Author(s):  
Martha Fabiola Martin-del-Campo-Solis ◽  
Cesar Castillo-Quevedo ◽  
Edgar Zamora-Gonzalez ◽  
Carlos Emiliano Buelna-García ◽  
Eduardo Robles-Chaparro ◽  
...  
Keyword(s):  
Free Energy ◽  
Energy Surface ◽  
Free Energy Surface ◽  
Different Temperatures
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