scholarly journals A New Framework to Quantify the Wetting Behaviour of Carbonate Rock Surfaces Based on the Relationship between Zeta Potential and Contact Angle

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 993 ◽  
Author(s):  
Sina Rezaei Gomari ◽  
Farida Amrouche ◽  
Ronaldo G. Santos ◽  
Hugh Christopher Greenwell ◽  
Pablo Cubillas
Keyword(s):  
Contact Angle ◽  
Zeta Potential ◽  
Stearic Acid ◽  
Carbonate Rock ◽  
Streaming Potential ◽  
Contact Angles ◽  
Surface Wetting ◽  
Acceptable Range ◽  
The Relationship ◽  
New Framework

This study introduces a new framework to quantify the wettability of powdered carbonate rock from existing correlations between zeta potential and contact angle. The new framework has the potential to be faster and cheaper than conventional approaches and could increase confidence in surface wetting quantification, since the results are insensitive to the inherent heterogeneity of rock surfaces. The obtained results from experiments were used to develop a set of equations for determining the carbonate rock contact angle from streaming potential data. The equations were validated for the evaluation of changes in the wettability of carbonate rock using different stearic acid oily solutions. The contact angles calculated from the proposed equations were then compared with measured values on the calcite surface. The results show that the proposed framework was able to quantify the wettability of carbonate rock with an acceptable range of error of about 4%–14%.

scholarly journals Influence of moisture content on the contact angle and surface tension measured on birch wood surfaces

2021 ◽  
Author(s):  
Rami Benkreif ◽  
Fatima Zohra Brahmia ◽  
Csilla Csiha
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Moisture Content ◽  
Solid Wood ◽  
Contact Angles ◽  
Surface Moisture ◽  
Wood Coatings ◽  
The Relationship ◽  
Wood Surfaces

AbstractSurface tension of solid wood surfaces affects the wettability and thus the adhesion of various adhesives and wood coatings. By measuring the contact angle of the wood, the surface tension can be calculated based on the Young-Dupré equation. Several publications have reported on contact angle measured with different test liquids, under different conditions. Results can only be compared if the test conditions are similar. While the roles of the drop volume, image shooting time etc., are widely recognized, the role of the wood surface moisture content (MC) is not evaluated in detail. In this study, the effect of wood moisture content on contact angle values, measured with distilled water and diiodomethane, on sanded birch (Betula pendula) surfaces was investigated, in order to find the relationship between them. With increasing MC from approximately 6% to 30%, increasing contact angle (decreasing surface tension) values were measured according to a logarithmic function. The function makes possible the calculation of contact angles that correspond to different MCs.

Influence of paper properties on adhesive strength of starch gluing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Claudia Anna Dohr ◽  
Ulrich Hirn
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Main Parameter ◽  
External Pressure ◽  
Liquid Penetration ◽  
Surface Wetting ◽  
Paper Properties ◽  
Substantial Correlation ◽  
The Relationship ◽  
Effect Of Surface

Abstract The effect of paper properties on the strength of starch gluing for Kraft sack papers has been investigated. We analyzed the effect of surface roughness, wettability and glue penetration. Surface roughness was found not to be related to gluing strength, also surface wetting measured by contact angle showed only a weak relation. Liquid penetration measured by ultrasound (ULP) was found to have a substantial correlation to gluing strength. Comparing ULP liquid penetration speed with actual glue uptake during the gluing process we found that they are only moderately connected. We are attributing this to the fact that the penetration and spreading of the glue on the paper is driven by applying an external pressure during the gluing process, which is not the case for the liquid penetration measurement. Investigating how asymmetrical glue penetration affects gluing strength we found that the relationship was low. The best indication for gluing strength turned out to be the surface wetting/substrate swelling parameter from the ultrasonic liquid penetration measurement. We conclude that the main parameter capturing gluing strength combines the influence of fiber wetting and penetration of the glue into the fibers.

Contact Angles as a Measure of Surface Wetting Properties in Filth Flotation Analysis

1964 ◽  
Vol 47 (3) ◽  
pp. 520-529
Author(s):  
Maryvee G Yakowitz ◽  
William V Eisenberg
Keyword(s):  
Contact Angle ◽  
Aqueous Phase ◽  
Aqueous Media ◽  
Contact Angles ◽  
Surface Wetting ◽  
Inverted Position ◽  
Oil Droplet ◽  
Wetting Properties ◽  
Specimen Material ◽  
Aqueous Solvent

Abstract A study was made of the surface wetting properties exhibited by insect fragments, animal hairs, and food particles in contact with oil and aqueous solvent systems used in oil flotation analytical procedures. The differential wetting phenomena involved in flotation separation procedures of both untreated and preliminarily treated materials can be studied by contact angle measurements, which provide valuable information about the degree of wettability and flotability of both filth and plant particles. The solid specimen material is immersed in an inverted position in the aqueous plase, and the applied oil droplet competes with the aqueous phase for "wetting" the solid. The contact angle is measured at the point where the oil droplet, the aqueous phase, and the solid surface meet. The instrument used for measuring contact angles and the accessory apparatus devised for the addition of oil droplets to inverted specimen mounts while immersed in aqueous media are illustrated.

A Zeta Potentiometric Study on Effects of Ionic Composition and Rock-Saturation on Surface-Charge Interactions in Low-Salinity Water Flooding for Carbonate Formation

2021 ◽  
Author(s):  
Paras Himmat Gopani ◽  
Navpreet Singh ◽  
Hemanta Kumar Sarma ◽  
Digambar S. Negi ◽  
Padmaja S. Mattey
Keyword(s):  
Zeta Potential ◽  
Surface Charge ◽  
Carbonate Rocks ◽  
Carbonate Rock ◽  
Ionic Composition ◽  
Streaming Potential ◽  
Potentiometric Studies ◽  
Rock Samples ◽  
Streaming Current ◽  
Charge Interactions

Abstract As carbonate reservoirs are mostly oil-wet, the potential for the success of a waterflooding is lower. Therefore, a primary focus during waterflooding such reservoirs is on the ionic composition and salinity of injected brine which are able to impact the alteration of the rock wettability favorably by altering the surface charge towards a higher negative value or close to zero. The objective of this study is to employ zeta potentiometric studies comprising streaming potential and streaming current techniques to quantify the surface interactions and charges between the carbonate rock and fluid type as a function of the variations in its ionic state and rock saturation. Zeta potentiometric studies were conducted on carbonate rock samples to understand the behavior of different aqueous solutions by variation in the brine's salinity and ionic composition and the results were integrated with wettability studies. The concentrations of potential-determining ions (PDIs) such as SO42-, Mg2+ and Ca2+ in the injected brines are deemed responsible for altering the wettability state of the carbonate rocks. Several diluted brines (25%, 10% and 1% diluted seawater) and smart brines have been investigated. Smart brines were prepared by spiking the concentration of major PDIs. All zeta potential measurements were conducted using a specially designed zeta potentiometer sample-holding clamp capable of using the whole core plugs rather than pulverized rock samples. A major advantage of using the whole core sample is that the same core can be used in subsequent coreflooding tests, thus making zeta potentiometric results more relevant and representative for a particular rock-fluid system used in the study. The classical streaming potential and streaming current techniques were used for zeta potential measurement. The Fairbrother-Mastin approach was used where the streaming potential is measured against different pressure differentials. Measurements were also carried out for brines with rock samples of different states: oil-saturated, water-saturated and rock samples cleaned with organic solvents to determine any likely variations in surface charge interactions. The results of our experiments imply that the value of zeta potential either increases or becomes more negative with increasing percentage of dilution (25%, 10%, and 1%). This can be attributed to electrical double-layer expansion which is primarily caused by reduced ionic strength. Furthermore, with measurements done on smart brines, zeta potential value was also found to be increased when different diluted brines are spiked with ionic concentration of PDIs such as sulfate. This could have been caused by surface ion alteration mechanism where PDIs get adsorbed on rock surface causing possible detachment of oil droplets. Both the phenomena are known mechanisms for altering wettability towards more water wetness in carbonate rocks and are discussed in detail.

Investigating the use of Nanoscale Bilayers Assembly on Stainless Steel Plate to Improve Evaporation

2013 ◽  
Vol 395-396 ◽  
pp. 718-725 ◽  
Author(s):  
Shen Chun Wu ◽  
Dawn Wang ◽  
Hsih Shing Li ◽  
Sin Jie Lin ◽  
Chao Tsai Hsu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Surface Modification ◽  
Contact Angles ◽  
Steel Plates ◽  
Stainless Steel Surface ◽  
Hydrophilic Surface ◽  
Evaporation Time ◽  
Assembly Technique ◽  
The Relationship

This study investigated the use of nanoscale bilayers assembly film for hydrophilic surface modification on stainless steel plates and observed its effects on the evaporation of acetone and ethanol on the plates. This study first established the nanoscale bilayers assembly technique, and then performed hydrophilic surface modification on stainless steel plates by changing the surface structure, producing different contact angles. The relationship between the number of bilayers (10, 20, and 30) and the resulting contact angle was empirically determined; results indicated that 20-bilayer modification yielded the best result, reducing the contact angle from 70° (unmodified surface) to 12°. Beyond 20 bilayers, at 30 bilayers, the samples show no significant changes or improvements to contact angle or hydrophilicity. Results from evaporation time tests showed that, compared to the evaporation time of ethanol and acetone on unmodified flat stainless steel surface, this decreased contact angle can improve the evaporation time by 100%, clearly indicating that hydrophilic surface modifications causes significant improvement in evaporation.

Investigating the Application of Nanoscale Bilayers Assembly on Stainless Steel Plate to Evaporation Behavior

2013 ◽  
Vol 750-752 ◽  
pp. 2104-2107 ◽  
Author(s):  
Shen Chun Wu ◽  
Chao Tsai Hsu ◽  
Wun Hong Yang ◽  
Dawn Wang ◽  
Hsih Shing Li ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Steel Plate ◽  
Contact Angles ◽  
Stainless Steel Plate ◽  
Hydrophilic Modification ◽  
Modified Surface ◽  
Surface Modified ◽  
First Time ◽  
The Relationship

This study investigates the use of nanoscale bilayers assembly film for hydrophilic modification on stainless steel plate and observed its effect on the plates evaporation behavior in acetone. This study first establishes the technique of nanoscale bilayers assembly, then performs surface hydrophilic modification on stainless steel plate by changing the surface structure, which produces different contact angles. The relationship between layers (0, 5, 10, 15 bilayers) of surface modified and the contact angle is empirically determined, and results show that, similar to findings stated in the literature [, after surface modification the contact angle decreases from 70° (layer 0) to 24° (layers 15); in addition, the results from this study have demonstrated a certain level of technical capability. This study was investigated the evaporation test in a modified surface , also is the first time reported in previous literature. Evaporation tests show that under the best contact angle evaporation rate can be increased by 50%, indicating the high potential of surface hydrophilic modification on stainless steel plate for improving evaporation behavior.

How to use alum with cationic dispersed rosin size

TAPPI Journal ◽  
2016 ◽  
Vol 15 (5) ◽  
pp. 331-335 ◽  
Author(s):  
LEBO XU ◽  
JEREMY MYERS ◽  
PETER HART
Keyword(s):  
Zeta Potential ◽  
Colloidal Particles ◽  
Streaming Potential ◽  
Excessive Amount ◽  
Paper Machine ◽  
Optimum Amount ◽  
Potential Measurement ◽  
Streaming Current ◽  
Wide Range ◽  
Laboratory Results

Retention of cationic dispersed rosin size was studied via turbidity measurements on stock filtrate with different alum and dispersed rosin size dosages. Stock charge characteristics were analyzed using both an analysis of charge demand determined via a streaming current detector and an evaluation of zeta potential of the fibers by streaming potential measurement. The results indicated that an optimum amount of alum existed such that good sizing retention was maintained throughout a wide range of dispersed rosin size dosages. However, when an excessive amount of alum was used and fines and colloidal particles were transitioned from anionic to cationic, the cationic size retention was reduced. Laboratory results were confirmed with a paper machine trial. All data suggested that a stock charge study was necessary to identify optimal alum dosage for a cationic dispersed rosin sizing program.

An Experimental Investigation on Thermal Conductivity and Viscosity of Graphene doped CNTs /TiO2 Nanofluid

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
A.M. Zetty Akhtar ◽  
M.M. Rahman ◽  
K. Kadirgama ◽  
M.A. Maleque
Keyword(s):  
Thermal Conductivity ◽  
Zeta Potential ◽  
Base Fluid ◽  
Minimum Quantity Lubrication ◽  
Cutting Fluid ◽  
Cutting Zone ◽  
Observation Method ◽  
The Stability ◽  
The Relationship ◽  
Zeta Potential Analysis

This paper presents the findings of the stability, thermal conductivity and viscosity of CNTs (doped with 10 wt% graphene)- TiO2 hybrid nanofluids under various concentrations. While the usage of cutting fluid in machining operation is necessary for removing the heat generated at the cutting zone, the excessive use of it could lead to environmental and health issue to the operators. Therefore, the minimum quantity lubrication (MQL) to replace the conventional flooding was introduced. The MQL method minimises the usage of cutting fluid as a step to achieve a cleaner environment and sustainable machining. However, the low thermal conductivity of the base fluid in the MQL system caused the insufficient removal of heat generated in the cutting zone. Addition of nanoparticles to the base fluid was then introduced to enhance the performance of cutting fluids. The ethylene glycol used as the base fluid, titanium dioxide (TiO2) and carbon nanotubes (CNTs) nanoparticle mixed to produce nanofluids with concentrations of 0.02 to 0.1 wt.% with an interval of 0.02 wt%. The mixing ratio of TiO2: CNTs was 90:10 and ratio of SDBS (surfactant): CNTs was 10:1. The stability of nanofluid checked using observation method and zeta potential analysis. The thermal conductivity and viscosity of suspension were measured at a temperature range between 30˚C to 70˚C (with increment of 10˚C) to determine the relationship between concentration and temperature on nanofluid’s thermal physical properties. Based on the results obtained, zeta potential value for nanofluid range from -50 to -70 mV indicates a good stability of the suspension. Thermal conductivity of nanofluid increases as an increase of temperature and enhancement ratio is within the range of 1.51 to 4.53 compared to the base fluid. Meanwhile, the viscosity of nanofluid shows decrements with an increase of the temperature remarks significant advantage in pumping power. The developed nanofluid in this study found to be stable with enhanced thermal conductivity and decrease in viscosity, which at once make it possible to be use as nanolubricant in machining operation.

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