Effects of imidazolium- and ammonium-based ionic liquids on clay swelling: experimental and simulation approach

AbstractWater-based fracturing fluids without an inhibitor promote clay swelling, which eventually creates wellbore instability. Several ionic liquids (ILs) have been studied as swelling inhibitors in recent years. The cations of the ILs are crucial to the inhibitory mechanisms that take place during hydraulic fracturing. Individual studies were carried out on several ILs with various cations, with the most frequently found being ammonium and imidazolium cations. As a result, the goal of this study is to compare these two cations to find an effective swelling inhibitor. A comparison and evaluation of the clay swelling inhibitory properties of tetramethylammonium chloride (TMACl) and 1-ethyl-3-methylimidazolium chloride (EMIMCl) were conducted in this work. Their results were also compared to a conventional inhibitor, potassium chloride (KCl), to see which performed better. The linear swelling test and the rheology test were used to determine the inhibitory performance of these compounds. Zeta potential measurements, Fourier-transform infrared spectroscopy, and contact angle measurements were carried out to experimentally explain the inhibitory mechanisms. In addition, the COSMO-RS simulation was conducted to explain the inhibitory processes and provide support for the experimental findings. The findings of the linear swelling test revealed that the swelling was reduced by 23.40% and 15.66%, respectively, after the application of TMACl and EMIMCl. The adsorption of ILs on the negatively charged clay surfaces, neutralizing the charges, as well as the lowering of the surface hydrophilicity, aided in the improvement of the swelling inhibition performance.

Download Full-text

Conductivity measurement of ionic liquids confined in the nanopores of metal–organic frameworks: a case study for [BMIM][TFSI] in HKUST-1

Ionics ◽

10.1007/s11581-021-04249-w ◽

2021 ◽

Author(s):

Zejun Zhang ◽

Chun Li ◽

Abhinav Chandresh ◽

Lars Heinke

Keyword(s):

Ionic Liquids ◽

Impedance Spectroscopy ◽

Ionic Conduction ◽

Electrochemical Impedance ◽

Metal Organic Framework ◽

Metal Organic Frameworks ◽

Conductivity Measurement ◽

Angle Measurements ◽

Contact Angle Measurements ◽

Metal Organic

AbstractNanoporous materials like metal–organic frameworks (MOFs) attract considerable attention as porous host for electrolytes like ionic liquids (ILs). The conductivity and mobility of the ions in the pores are among the key properties and their experimental quantification is of paramount importance. Here, three different approaches for the quantification of the ion conductivity of IL@MOF via electrochemical impedance spectroscopy (EIS) are compared: the material in the form of IL-impregnated MOF powders pressed into pellets between two planar electrodes, MOF films grown on substrates with deposited electrodes loaded with IL by impregnation, and the IL-loaded MOF films where excess IL is removed. Contact-angle measurements and EIS data show that the excess IL on the outer MOF surface of the film or pellet results in apparent conductivities, larger than the intrinsic conductivity of the IL@MOF. Removing the excess IL enables the experimental quantification of the intrinsic IL@MOF conductivity. Graphical abstract The ionic conduction of ionic liquid (IL) confined in nanoporous metal–organic framework (MOF) is explored via impedance spectroscopy, where the material is either in the form of pellets pressed from powder or in the form of thin films grown on suitable substrates. The different methods show substantially different results, attributed to excess IL on the external surface, and a method for recording the intrinsic IL@MOF conductivity is presented.

Download Full-text

Effect of Imidazolium-Based Ionic Liquids on the Interfacial Tension of the Alkane–Water System and Its Influence on the Wettability Alteration of Quartz under Saline Conditions through Contact Angle Measurements

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.7b02528 ◽

2017 ◽

Vol 56 (46) ◽

pp. 13521-13534 ◽

Cited By ~ 16

Author(s):

Sugirtha Velusamy ◽

Sivabalan Sakthivel ◽

Jitendra S. Sangwai

Keyword(s):

Contact Angle ◽

Ionic Liquids ◽

Interfacial Tension ◽

Water System ◽

Wettability Alteration ◽

Angle Measurements ◽

Contact Angle Measurements

Download Full-text

Nanostructured Polymer Brushes With Reversibly Changing Properties

MRS Proceedings ◽

10.1557/proc-727-r2.5 ◽

2002 ◽

Vol 727 ◽

Author(s):

Denys Usov ◽

Manfred Stamm ◽

Sergiy Minko ◽

Christian Froeck ◽

Andreas Scholl ◽

...

Keyword(s):

Polymer Brushes ◽

Phase Segregation ◽

Water Contact ◽

Angle Measurements ◽

Nanostructured Polymer ◽

Contact Angle Measurements ◽

Vertical Segregation ◽

Oxygen Plasma Etching ◽

Grafting From ◽

Photoemission Electron

AbstractWe investigated the interplay between different mechanisms of the lateral and vertical segregation in the synthesized via “grafting from” approach symmetric A/B (where A and B are poly(styrene-co-2,3,4,5,6-pentafluorostyrene) and poly(methylmethacrylate), respectively) polymer brushes upon exposure to different solvents. We used X-ray photoemission electron spectroscopy and microscopy (X-PEEM), AFM, water contact angle measurements, and oxygen plasma etching to study morphology of the brushes. The ripple morphology after toluene (nonselective solvent) revealed elongated lamellar-like domains of A and B polymers alternating across the surface. The dimple-A morphology consisting of round clusters of the polymer A was observed after acetone (selective solvent for B). The top layer was enriched with the polymer B showing that the brush underwent both the lateral and vertical phase segregation. A qualitative agreement with predictions of SCF theory was found.

Download Full-text

Wrinkling Poly(trimethylene 2,5-Furanoate) Free-standing Films: Nanostructure Formation and Physical Properties

10.26434/chemrxiv.11867205.v1 ◽

2020 ◽

Author(s):

Michelina Soccio ◽

Nadia Lotti ◽

Andrea Munari ◽

Esther Rebollar ◽

Daniel E Martínez-Tong

Keyword(s):

Irradiation Time ◽

Polymer Surface ◽

Laser Source ◽

Free Standing ◽

Force Microscopy ◽

Nanostructure Formation ◽

Physicochemical Changes ◽

Angle Measurements ◽

Atomic Force ◽

Contact Angle Measurements

<p>Nanostructured wrinkles were developed on fully bio-based poly(trimethylene furanoate) (PTF) films by using the technique of Laser Induced Periodic Surface Structures (LIPSS). We investigated the effect of irradiation time on wrinkle formation using an UV pulsed laser source, at a fluence of 8 mJ/cm2. It was found that the pulse range between 600 and 4800 pulses allowed formation of periodic nanometric ripples. The nanostructured surface was studied using a combined macro- and nanoscale approach. We evaluated possible physicochemical changes taking place on the polymer surface after irradiation by infrared spectroscopy, contact angle measurements and atomic force microscopy. The macroscopic physicochemical properties of PTF showed almost no changes after nanostructure formation, differently from the results previously found for the terephthalic counterparts, as poly(ethyleneterephthalate), PET, and poly(trimethyleneterephthalate), PTT. The surface mechanical properties of the nanostructured PTF were found to be improved, as evidenced by nanomechanical force spectroscopy measurements. In particular, an increased Young’s modulus and higher stiffness for the nanostructured sample were measured. <br></p>

Download Full-text

Adhesion Studies during Generative Hybridization of Textile-Reinforced Thermoplastic Composites via Additive Manufacturing

Materials ◽

10.3390/ma14143888 ◽

2021 ◽

Vol 14 (14) ◽

pp. 3888

Author(s):

Johanna Maier ◽

Christian Vogel ◽

Tobias Lebelt ◽

Vinzenz Geske ◽

Thomas Behnisch ◽

...

Keyword(s):

Additive Manufacturing ◽

Polyamide 6 ◽

Thermoplastic Composites ◽

Efficient Production ◽

Angle Measurements ◽

Small Series ◽

Contact Angle Measurements ◽

Static Tensile ◽

Pre Treatment ◽

Manufacturing Technologies

Generative hybridization enables the efficient production of lightweight structures by combining classic manufacturing processes with additive manufacturing technologies. This type of functionalization process allows components with high geometric complexity and high mechanical properties to be produced efficiently in small series without the need for additional molds. In this study, hybrid specimens were generated by additively depositing PA6 (polyamide 6) via fused layer modeling (FLM) onto continuous woven fiber GF/PA6 (glass fiber/polyamide 6) flat preforms. Specifically, the effects of surface pre-treatment and process-induced surface interactions were investigated using optical microscopy for contact angle measurements as well as laser profilometry and thermal analytics. The bonding characteristic at the interface was evaluated via quasi-static tensile pull-off tests. Results indicate that both the bond strength and corresponding failure type vary with pre-treatment settings and process parameters during generative hybridization. It is shown that both the base substrate temperature and the FLM nozzle distance have a significant influence on the adhesive tensile strength. In particular, it can be seen that surface activation by plasma can significantly improve the specific adhesion in generative hybridization.

Download Full-text

Corrigendum to Reply to the comments on “Contact angle measurements of CO2–water–quartz/calcite systems in the perspective of carbon sequestration” [International Journal of Greenhouse Gas Control 7 (2012) 263–264]

International Journal of Greenhouse Gas Control ◽

10.1016/j.ijggc.2021.103425 ◽

2021 ◽

pp. 103425

Author(s):

Prem Kumar Bikkina

Keyword(s):

Contact Angle ◽

Carbon Sequestration ◽

Greenhouse Gas ◽

Angle Measurements ◽

Contact Angle Measurements ◽

Gas Control

Download Full-text

Dicationic Surfactants as an Additive in Fracturing Fluids to Mitigate Clay Swelling: A Petrophysical and Rock Mechanical Assessment

ACS Omega ◽

10.1021/acsomega.1c01388 ◽

2021 ◽

Author(s):

Zeeshan Tariq ◽

Muhammad Shahzad Kamal ◽

Mohamed Mahmoud ◽

Mobeen Murtaza ◽

Abdulazeez Abdulraheem ◽

...

Keyword(s):

Clay Swelling ◽

Fracturing Fluids ◽

Dicationic Surfactants

Download Full-text

Epoxy/alumina composite coating on welded steel 316L with excellent wear and anticorrosion properties

Scientific Reports ◽

10.1038/s41598-021-91741-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Maryama Hammi ◽

Younes Ziat ◽

Zakaryaa Zarhri ◽

Charaf Laghlimi ◽

Abdelaziz Moutcine

Keyword(s):

Electrochemical Behaviour ◽

Sem Analysis ◽

Water Contact ◽

Welded Steel ◽

Melted Zone ◽

Angle Measurements ◽

Contact Angle Measurements ◽

Alumina Composite ◽

The Cost ◽

Good Contrast

AbstractThe main purpose of this study is to elaborate anticorrosive coatings for the welded steel 316L, since this later is widely used in industrial field. Hence, within this work we have studied the electrochemical behaviour of different zones of the welded steel 316 in 1 M HCl media. The macrography study of the welded steel has revealed the different areas with a good contrast. We have stated three different zones, namely; melted zone (MZ), heat affected zone (HAZ) and base metal zone (BM). Impedance studies on welded steel 316L were conducted in 1 M HCl solution, coating of Epoxy/Alumina composite was applied on different zones, in order to reveal the anti-corrosion efficiency in each zone. Scanning electron microscopy (SEM) analysis was undertaken in order to check how far the used coating in such aggressive media protects the studied zones and these findings were assessed by water contact angle measurements. The choice of this coating is based on the cost and the safety. We concluded that the Epoxy/Alumina composite has a good protecting effect regarding welded steel in aggressive media.

Download Full-text