Exploring crystalline molecular materials at high pressure

Studies of Local and Intermediate Range Structure in Crystalline and Amorphous Materials at High Pressure Using High-energy X-rays

The method of high-energy total elastic X-ray scattering to determine the atomic structure of nanocrystalline, highly disordered and amorphous materials is presented. The current state of the technique, its potential, and limitations are discussed with two successful studies on the pressure induced phase transition in mackinawite (FeS) and the high-pressure behavior of liquid gallium.

Adsorption in Porous Materials at High Pressure: Theory and Experiment

We consider the thermodynamics of adsorption of gases in porous solids from both the perspective of absolute properties which appear naturally in theoretical studies and that of excess properties which are measured in experiments. Our thermodynamic description starts by treating the gas (or gas mixture) plus porous solid system as a mixture to which we can apply solution thermodynamics. We show...

Molecular carbon dioxide at high pressure and high temperature

Exploring the high pressure SEM

The high pressure SEM (HPSEM) is an important tool for materials characterisation. The presence of a gaseous atmosphere inside the specimen chamber permits to limit the charging effect and to obtain image with specific electron detector. The electron beam scattering due to the introduction of the gas within the specimen chamber of the HP-SEM influences the image quality and the microanalysis re...

Considerations of Well Cementing Materials in High-Pressure, High-Temperature Conditions (RESEARCH NOTE)

As worldwide demand of hydrocarbon is growing fast, the oil and gas companies have been forced to explore reservoirs with more hostile conditions, such as high-pressure, high-temperature conditions. Improved technology, material selection and testing procedures are required to overcome the common problems in these conditions. One of the main phases of well construction is cementing job. Appropr...