MCM-41 particles were synthesized using inorganic raw materials and  Cetyltrimethylammonium bromide (CTAB). The textural properties and structure of MCM-41 particles were characterized by XRD, SEM, TEM and N2 adsorption-desorption methods. To study performance of Dubinin-Astakhov and Dubinin-Raduchkevic isotherm models in evaluating mesopore volume and pore size of MCM-41 samples, the mesopore ...

The Skempton pore pressure coefficient, B, is defined as the variation in with unit change confining under undrained conditions. B parameter an essential to consider coupled effects of solid–fluid compressibility and skeleton a porous system. It key factor exploring possible definition effective stress frozen soil. However, limited experimental theoretical research available literature give ins...

The siliceous zeolite Socony Mobil-twelve (ZSM-12) or MTW (Mobil-TWelve) with a one-dimensional pore system was studied at high pressure by synchrotron X-ray powder diffraction in nonpenetrating DAPHNE7474 oil and penetrating argon medium. A phase transition from the space group C2/c to P2/n is observed medium close 1.5 GPa 4% volume decrease strong increase compressibility ac plane correspondi...

Densities , viscosities and ultrasonic velocities has been measured for the ternary mixture involving morpholine(1) + cyclohexanone(2) + 1hexanol(3) at 308.15K and 318.15K over the entire range of mole fraction. Parameters like excess volume, adiabatic compressibility, free volume, linear free energy, acoustic impedance, relative association and isentropic compressibility were calculated. From ...

The technique of cryogenic treatments requires injecting extremely cold fluids such as liquid nitrogen (LN2) into formations to create fractures in addition connecting pre-existing fracture networks. This study investigated the effects implementing and pressurizing treatment on physical (porosity permeability) mechanical properties (Young’s modulus, Poisson’s ratio, bulk compressibility) Marcel...

Ultrasonic velocities in solution of tetrabutylammonium bromide (TBAB) in 10, 20 and 30 %w/w N, N– dimethylformamide (DMF)-water mixtures were measured at 303 K, 308 K and 313 K by using the pulse echo overlap method at a frequency of 3 MHz. The ultrasonic velocity, density, and viscosity were used to calculate the adiabatic compressibility, apparent molal compressibility, apparent molal volume...

We review recent molecular dynamics simulations of thermally activated undulations and defects in the lamellar Lα phase of a binary amphiphile-solvent mixture, using an idealized molecular coarse-grained model: Solvent particles are represented by beads, and amphiphiles by bead-and-spring tetramers. We find that our results are in excellent agreement with the predictions of simple mesoscopic th...

Abstract Identifying changes in coal permeability with gas pressure and accurately codifying mean effective stresses laboratory samples are crucial predicting gas-flow behavior reservoirs. Traditionally, to is assessed using the steady-state method, where equivalent indexed average of upstream downstream pressures coal, while ignoring nonlinear gradient along flow path. For a compressible gas, ...

We report here results of the first direct measurement of partial volume and compressibility changes of a protein as it forms an amyloid protofibril. We use a high precision density meter and an ultrasonic velocity meter on a solution of intrinsically denatured, disulfide-deficient variant of hen lysozyme, and follow the time-dependent changes in volume and compressibility, as the protein spont...