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Dispersed Systems in Physical Chemistry

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Physical Chemistry".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 2699

Special Issue Editors

Department of Physical Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, M. Skłodowskiej—Curie 3 Sq., 20-031 Lublin, Poland
Interests: macromolecules; polysaccharides; adsorption; colloidal stability; polymer-surfactant interactions; clay minerals; nano-oxides; suspensions; electric double layer; radioecology
Special Issues, Collections and Topics in MDPI journals
Department of Process Engineering and Technology of Polymer and Carbon Materials, Faculty of Chemistry, Wroclaw University of Science and Technology, Wroclaw, Poland
Interests: (bio)surfactants; (bio)polymers; calcium carbonate; struvite; biomineralization; organic-inorganic hybrid materials; nanotechnology; chemistry of colloidal systems; membrane separation; nutrients recycling

Special Issue Information

Dear Colleagues,

To understand dispersed systems, we need to understand what a colloid is. A colloid is a mixture of two substances, or more specifically, a heterogeneous solution. One of these substances (dispersed phase) is distributed in form of subdivided particles throughout another substance (continuous phase, dispersion medium). Dispersed systems are typically classified based upon the size of the dispersed phase (i.e., particles or droplets). Their diameters are usually on the order of nanometers. Depending upon the phase of the dispersion, colloidal dispersions can be separated into a few types, such as foams, aerosols, suspensions, gels, and emulsions. The main goal of this Special Issue on “Dispersed Systems in Physical Chemistry” is to provide an open forum where researchers can share their investigations and findings. Contributions to this Issue, both in the form of original research and review articles, may cover all aspects of dispersed systems; studies with multidisciplinary input, offering new methodologies or insights, are particularly welcome. Potential topics include, but are not limited to:

  • Dispersed systems—preparation, characterization, and applications;
  • Methods and techniques for detecting and characterizing the physical, chemical, and biological properties of dispersed systems;
  • Interactions between components of dispersed systems;
  • Innovative usage of dispersed systems.

Dr. Elżbieta Grządka
Dr. Anna Bastrzyk
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • dispersed systems
  • colloids
  • emulsion
  • suspension
  • aerosol
  • foam
  • sol
  • gel
  • nanoparticles

Published Papers (1 paper)

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Research

20 pages, 7697 KiB  
Article
Effect of Native Reservoir State and Oilfield Operations on Clay Mineral Surface Chemistry
by Isah Mohammed, Dhafer Al Shehri, Mohamed Mahmoud, Muhammad Shahzad Kamal, Olalekan Alade, Muhammad Arif and Shirish Patil
Molecules 2022, 27(5), 1739; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27051739 - 07 Mar 2022
Cited by 7 | Viewed by 2132
Abstract
An understanding of clay mineral surface chemistry is becoming critical as deeper levels of control of reservoir rock wettability via fluid–solid interactions are sought. Reservoir rock is composed of many minerals that contact the crude oil and control the wetting state of the [...] Read more.
An understanding of clay mineral surface chemistry is becoming critical as deeper levels of control of reservoir rock wettability via fluid–solid interactions are sought. Reservoir rock is composed of many minerals that contact the crude oil and control the wetting state of the rock. Clay minerals are one of the minerals present in reservoir rock, with a high surface area and cation exchange capacity. This is a first-of-its-kind study that presents zeta potential measurements and insights into the surface charge development process of clay minerals (chlorite, illite, kaolinite, and montmorillonite) in a native reservoir environment. Presented in this study as well is the effect of fluid salinity, composition, and oilfield operations on clay mineral surface charge development. Experimental results show that the surface charge of clay minerals is controlled by electrostatic and electrophilic interactions as well as the electrical double layer. Results from this study showed that clay minerals are negatively charged in formation brines as well as in deionized water, except in the case of chlorite, which is positively charged in formation water. In addition, a negative surface charge results from oilfield operations, except for operations at a high alkaline pH range of 10–13. Furthermore, a reduction in the concentrations of Na, Mg, Ca, and bicarbonate ions does not reverse the surface charge of the clay minerals; however, an increase in sulfate ion concentration does. Established in this study as well, is a good correlation between the zeta potential value of the clay minerals and contact angle, as an increase in fluid salinity results in a reduction of the negative charge magnitude and an increase in contact angle from 63 to 102 degree in the case of chlorite. Lastly, findings from this study provide vital information that would enhance the understanding of the role of clay minerals in the improvement of oil recovery. Full article
(This article belongs to the Special Issue Dispersed Systems in Physical Chemistry)
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