Ultrasonic Velocities, Densities, Viscosities, Electrical Conductivities, Raman Spectra, and Molecular Dynamics Simulations of Aqueous Solutions of Mg(OAc)2and Mg(NO3)2:  Hofmeister Effects and Ion Pair Formation

2005 ◽  
Vol 109 (50) ◽  
pp. 24108-24120 ◽  
Author(s):  
Abdul Wahab ◽  
Sekh Mahiuddin ◽  
Glenn Hefter ◽  
Werner Kunz ◽  
Babak Minofar ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solutions ◽  
Molecular Dynamics Simulations ◽  
Raman Spectra ◽  
Ion Pair ◽  
Pair Formation ◽  
Ultrasonic Velocities ◽  
Ion Pair Formation ◽  
Electrical Conductivities ◽  
Dynamics Simulations

UNDERSTANDING DIFFERENT LCST LEVELS OF POLY(N-ALKYLACRYLAMIDE)S BY MOLECULAR DYNAMICS SIMULATIONS AND QUANTUM MECHANICS CALCULATIONS

2011 ◽  
Vol 10 (03) ◽  
pp. 359-370 ◽  
Author(s):  
JUAN PANG ◽  
HU YANG ◽  
JING MA ◽  
RONGSHI CHENG
Keyword(s):  
Molecular Dynamics ◽  
Quantum Mechanics ◽  
Aqueous Solutions ◽  
Molecular Dynamics Simulations ◽  
Steric Effect ◽  
Conformational Transition ◽  
Methyl Group ◽  
Branched Chain ◽  
Dynamics Simulations ◽  
Different Levels

Poly(N-alkylacrylamide) is a group of thermo-sensitive polymers that include poly (N-isopropylacrylamide), poly(N-n-propylacrylamide), poly(N-isopropylmethacryl-amide), and so on. The polymers exhibit different levels of lower critical solution temperatures (LCST) in aqueous solutions. In this article, their monomers and oligomers with 10 repeating units are selected, respectively, to demonstrate the cause of different LCST levels of the polymers in aqueous solutions using molecular dynamics simulations and quantum mechanics calculations. The monomers have functional groups of different steric volume that greatly affect the conformational transition of chains and LCST levels of the polymers. A branched chain of N-propyl group in N-isopropylacrylamide and an additional methyl group at α-carbon in N-isopropylmethacrylamide both increase the steric effect, making it more difficult for monomers to draw closer and resulting in higher LCST levels of the polymers. In addition, the simulated results from their corresponding oligomers exhibit the similar trend to those from the monomers.

scholarly journals Quantitative interpretation of molecular dynamics simulations for X-ray photoelectron spectroscopy of aqueous solutions

2016 ◽  
Vol 144 (15) ◽  
pp. 154704 ◽  
Author(s):  
Giorgia Olivieri ◽  
Krista M. Parry ◽  
Cedric J. Powell ◽  
Douglas J. Tobias ◽  
Matthew A. Brown
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solutions ◽  
Molecular Dynamics Simulations ◽  
Photoelectron Spectroscopy ◽  
Quantitative Interpretation ◽  
X Ray ◽  
Dynamics Simulations

Probing the Effect of Salt on Asphaltene Aggregation in Aqueous Solutions Using Molecular Dynamics Simulations

2018 ◽  
Vol 32 (8) ◽  
pp. 8090-8097 ◽  
Author(s):  
Xiaoyu Sun ◽  
Cuiying Jian ◽  
Yingkai He ◽  
Hongbo Zeng ◽  
Tian Tang
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solutions ◽  
Molecular Dynamics Simulations ◽  
Dynamics Simulations
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