Effect of Temperature on the Structure of Adsorption Layers Formed by Adsorption of Polymers in the Transition Region from Dilute to Semidilute Solutions

Chornaya, Valentine; Lipatov, Yu.S.; Todosijchuk, Tamara; Menzheres, G. Ya.

doi:10.1006/jcis.2002.8609

Cited by 11 publications

(2 citation statements)

References 17 publications

(14 reference statements)

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“…Adsorption in the PBMA−PS−SiO 2 (silica) system represents a traditional case for comparison of the abovementioned theoretical considerations with the experiment, and it has been addressed in several previous publications. ,− The PBMA/PS system Flory−Huggins interaction parameter χ AB has been measured to be 0.0072 . It is a small positive value denoting the immiscibility of the polymer components.…”

Section: Resultsmentioning

confidence: 99%

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Lipatov

Özdemir

et al. 2007

Langmuir

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Atomic force microscopy (AFM) and ultrasonic force microscopy (UFM) have been used to study the properties of adsorption layers formed by two incompatible polymers, polystyrene and poly(butyl methacrylate), in the course of simultaneous adsorption on the surface of silica (naturally oxidized surface of a silicon wafer). The adsorption was performed from solutions containing both of the components in a common solvent (carbon tetrachloride) in dilute and semidilute concentration regimes. It was discovered that in both cases the structure of adsorption layers has a complex mosaic structure, the details of which depend on solution composition, on the solution concentration regime, and on the ratio of the components in the adsorption layer. The observed structural inhomogeneity on the length scale of approximately 200-500 nm (distribution of segment density revealed by UFM) appears as result of thermodynamic incompatibility in the system and is conditioned by changes in the conformation states of the adsorbed macromolecules in the route of competitive adsorption of the components. The adsorbed polymer films with thicknesses of approximately 20-500 nm appeared to have fractal properties and could be characterized with fractal dimensions dependent on the ratio of the components at the interface and the adsorption conditions.

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Section: Resultsmentioning

confidence: 99%

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Lipatov

Özdemir

et al. 2007

Langmuir

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“…The thickness of the adsorbed layer (h ads ) can be calculated with the use of two different methods: (1) an approach used for calculation of protein film thickness (Vasina et al, 2009), and (2) characterization of the structure of adsorption layers formed by adsorption of polymers (Chornaya et al, 2002). Appendix B shows detailed example calculations of the thickness of the adsorbed layer using the aforementioned methods.…”

Section: Real Adsorbed Porositymentioning

confidence: 99%

Evaluation of Quintuple Porosity in Shale Petroleum Reservoirs

Aguilera

Lopez

2013

All Days

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The use of a quintuple porosity system for calculation of original petroleum in place (OPIP) in shales is important as neglecting some of the porosities can result in pessimistic values of OPIP and production rates. Based on the concept of Total Petroleum System (Magoon and Beaumont, 1999) the word 'Petroleum' includes (1) thermal and biological hydrocarbon gas, (2) condensates, (3) crude oils and (4) natural bitumen. In the case of natural gas, the gas is trapped and stored in shale in different ways: (1) gas adsorbed in the kerogen material, (2) free gas trapped in nonorganic inter-particle (matrix) porosity, (3) free gas trapped in microfracture and slot porosity, (4) free gas stored in hydraulic fractures created during the stimulation of the shale reservoir, and (5) free gas trapped in a pore network developed within the organic matter or kerogen. An additional storage element is provided by gas dissolved in kerogen.The governing equations that describe the gas mass balance in the quintuple porosity model are presented in detail. The series and parallel gas transport approaches discussed previously in the literature are shown to be special cases of the new general gas transport formulation developed in this study. The effects of permeability stress-dependency are taken into account. Real data from Devonian gas shales are used to illustrate the effect of free gas, adsorbed gas and dissolved gas in a material balance crossplot of P/Z vs. cumulative gas production.Historically, the large contribution of organic porosity, natural fractures and hydraulic fractures that can contribute a significant amount of free petroleum in place has not been taken into account. And many of the laboratory experiments used for determining data utilized in computations of OPIP and production rates have been carried out in crushed samples, which by their very nature do not generally preserve natural fractures, slots and all the porosity present in the organic matter. This leads to pessimistic values of OPIP and rates. This helps to explain the larger than anticipated rates and recoveries of natural gas from some of these formations, for example Devonian shales, which have been producing for several decades.Although the quintuple porosity characterization mentioned above indicates very heterogeneous systems, the production performance is less heterogeneous than that of carbonates, sandstones and naturally fractured tight reservoirs. This surprising result is demonstrated with the use of actual production data from various petroleum reservoirs around the world. The subject matter is significant because of the large volume of petroleum resources in shales throughout the world, which probably are underestimated because of not considering in a single model all types of porosity discussed in this study.

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On the nanostructure of polymer layers formed by adsorption from binary and ternary solutions on a solid SiO2: a combined adsorption and atomic force microscopy (AFM) study

et al. 2006

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Effect of Temperature on the Structure of Adsorption Layers Formed by Adsorption of Polymers in the Transition Region from Dilute to Semidilute Solutions

Cited by 11 publications

References 17 publications

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Evaluation of Quintuple Porosity in Shale Petroleum Reservoirs

On the nanostructure of polymer layers formed by adsorption from binary and ternary solutions on a solid SiO2: a combined adsorption and atomic force microscopy (AFM) study

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