Does Molecular Mass Greatly Affect Boiling and Melting Points?

Ion calorimetry: Using mass spectrometry to measure melting points.

Calorimetry measurements have been used to probe the melting of aluminum cluster cations with 63 to 83 atoms. Heat capacities were determined as a function of temperature (from 150 to 1050 K) for size-selected cluster ions using an approach based on multicollision-induced dissociation. The experimental method is described in detail and the assumptions are critically evaluated. Most of the alumi...

Does life history affect molecular evolutionary rates?

Investigation of Melting by Molecular Dynamics Simulation

The melting of a 64 ion microcrystal of KCI was studied by means of a molecular dynamics computer simulation. We used a central pair interaction with an inverse power law repulsion. The thermodynamics, kinetic and structural properties such as melting temperature, latent heat, mean square displacement, diffusion constant, radial distribution function and bond angle distribution are calculated. ...

Molecular Dynamics Simulation of the Melting Process in Au15Ag40 Nanoalloys

In this study the operations of melting of Au15Ag40 nanoalloy have been studied using the molecular dynamic simulations through the Gupta multiparticle potential and the nonergodicity of simulations is eliminated by the multiple histogram method. The melting characteristics are determined by the analysis of variations in the potential energy. The calculations indicate that the melting of Au15Ag...

Prediction of Normal Boiling Points of Hydrocarbons Using Simple Molecular Properties

Four hundred and seventy-six hydrocarbons (CnHm) were utilized to fit their normal boiling point temperatures (NBPT) as a function of molecular weight and carbon atomic fraction. The proposed model is of the following form: NBPT = a∗(Cfrac)∧b∗(MW )∧c, where a, b, and c are the non-linear regressed parameters for the given model; Cfrac is the carbon atomic fraction in a molecule, which is equal ...