Surfactant concentration and pH effects on the zeta potential values of alumina nanofluids to inspect stability

2019 ◽  
Vol 583 ◽  
pp. 123960 ◽  
Author(s):  
Karen Cacua ◽  
Fredy Ordoñez ◽  
Camilo Zapata ◽  
Bernardo Herrera ◽  
Elizabeth Pabón ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Surfactant Concentration ◽  
Ph Effects

scholarly journals Direct Evidence of Salinity and pH Effects on the Interfacial Interactions of Asphaltene-Brine-Silica Systems

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1214 ◽  
Author(s):  
Fanghui Liu ◽  
Hui Yang ◽  
Ting Chen ◽  
Shanmeiyu Zhang ◽  
Danfeng Yu ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Hydraulic Fracturing ◽  
Silica Surface ◽  
Adhesion Force ◽  
Ph Value ◽  
Complex Function ◽  
Intermolecular Forces ◽  
Ph Effects ◽  
Water Recovery ◽  
Flowback Water

The hydraulic fracturing technique remains essential to unlock fossil fuel from shale oil reservoirs. However, water imbibed by shale during hydraulic fracturing triggers environmental and technical challenges due to the low flowback water recovery. While it appears that the imbibition of fracturing fluid is a complex function of physico-chemical processes in particular capillary force which is associated with wettability of oil-brine-shale, the controlling factor(s) to govern the wettability is incomplete and the literature data in this context is missing. We thus measured the adsorption/desorption of asphaltenes on silica surface in the presence of brines using quartz crystal microbalance with dissipation (QCM-D). We detected zeta potential of asphaltene-brine and brine-silica systems and calculated the disjoining pressures of the asphaltene-brine-silica system in the case of different salinity. Moreover, we performed a geochemical study to quantify the variation of surface chemical species at asphaltene and silica surfaces with different pH values and used the chemical force microscope (CFM) method to quantify the effect of pH on intermolecular forces. Our results show that lowering salinity or raising pH reduced the adhesion force between asphaltene and silica surface. For example, at a pH value of 6.5, when the concentration of injected water is reduced from 1000 mM to 100 mM and 10 mM, the adhesion force decreased by approximately 58% and 66%, respectively. In addition, for the 100 mM NaCl solution, when the pH value increased from 4.5 to 6.5 and 9, the adhesion force decreased by approximately 56% and 87%, respectively. Decreased adhesion forces between asphaltene and the silica surface could promote the desorption of asphaltene from the silica surface, resulting in a negative zeta potential for both asphaltene-silica and brine-silica interfaces and a shift of wettability towards water-wet characteristic. During such a process, -NH+ number at asphaltene surfaces decreases and the bonds between -NH+ and >SiO− break down, to further interpret the formation of a thinner asphaltene adlayer on the rock surface. This study proposes a reliable theoretical basis for the application of hydraulic fracturing technology, and a facile and possible manipulation strategy to increase flowback water from unconventional reservoirs.

scholarly journals Influence of Mineralogy and Surfactant Concentration on Zeta Potential in Intact Sandstone at High Pressure

2021 ◽  
Author(s):  
Faisal Ur Rahman Awan ◽  
Ahmed Al-Yaseri ◽  
Hamed Akhondzadeh ◽  
Stefan Iglauer ◽  
Alireza Keshavarz
Keyword(s):  
High Pressure ◽  
Zeta Potential ◽  
Surfactant Concentration

scholarly journals Pengaruh Variasi Kombinasi Konsentrasi Surfaktan Non Ionik (Span 60 Dan Peg-40 Hco) Terhadap Stabilitas Fisik Mikroemulsi Koenzym Q10

2020 ◽  
Vol 6 (1) ◽  
pp. 77-83
Author(s):  
Silvi Ayu Wulansari ◽  
Umarudin Umarudin
Keyword(s):  
Zeta Potential ◽  
Droplet Size ◽  
Coenzyme Q10 ◽  
Surfactant Concentration ◽  
Rice Bran Oil ◽  
Physical Stability ◽  
Polydispersity Index ◽  
Ionic Surfactant ◽  
Before And After ◽  
Span 60

Coenzyme Q10 is a compound that functions as an antioxidant with a large molecular weight of 863.36 g / mol and has lipophilic properties. This makes coenzyme Q10 need to be formulated to improve the solubility of the material and the delivery system in the skin. This study aims to determine the effect of various combinations of non-ionic surfactant concentrations (span 60 and PEG-40 HCO) on the physical stability of microemulsions. In this study Coenzyme, Q10 was formulated in oil-type microemulsion preparations in water. The oil used as the oil phase is rice bran oil with a combination of surfactant span 60 and PEG-40 HCO and 96% ethanol as a cosurfactant. the microemulsion was made in 4 microemulsion formulas namely FI, F2, F3, and F4, each formula was made 3 replications. Microemulsion preparations were evaluated after 24 hours after the preparations were made, observations made included organoleptic (shape, color, and phase formed), pH, viscosity, droplet size, zeta potential, and polydispersity index before and after centrifugation test with 10,000 rpm for 30 minutes. The research data were processed statistically using the Kruskal-Wallis analysis and Mann-Whitney follow-up tests. The results showed that the surfactant concentration affected physical characteristics (viscosity, droplet size, zeta potential, and polydispersity index) with a significantly different result (p <0.05) but the surfactant concentration did not affect the pH with the results not significantly different (p> 0, 05).

scholarly journals Pengaruh konsentrasi PEG 400 sebagai kosurfaktan pada formulasi nanoemulsi minyak kepayang

2020 ◽  
Vol 5 (1) ◽  
pp. 1-14
Author(s):  
Maharini ◽  
Rismarika ◽  
Yusnelti
Keyword(s):  
Drug Delivery ◽  
Particle Size ◽  
Zeta Potential ◽  
Surfactant Concentration ◽  
Tween 80 ◽  
Polydispersity Index ◽  
Peg 400 ◽  
Bright Yellow ◽  
Yellow Color ◽  
Size Uniformity

Kepayang oil has a high content of linoleic and oleic acids. Linoleic and oleic acids act as emollients in the cosmetic field. Nanotechnology is one of the latestinnovations that can be used in cosmetics preparation delivery systems because it can improve the drug delivery process. This study aims to examine the effect of PEG 400 on the formulation of Kepayang oil nanoemulsion. The concentrations of tween 80 and variation concentrations of PEG 400 used in F1, F2, and F3 are 36%: 0%, 36%: 24% and 36%: 14% using the SNEDDS method. The characteristics of nanoemulsion preparations include organoleptic, particle size, polydispersity index, and zeta potential. The result of nanoemulsion production has the organoleptic form in bright yellow color and has a distinctive odor, the particle size in F1, F2 and F3 are 11.8, 13.2 and 11.3 with a polydispersity index of 0.315, 0.147 and 0.121 and zeta potential -16.2, 13.4 and 1.8. The effect of variations in surfactant concentration in the nanoemulsion formulations of kepayang oil is that the higher the level of PEG 400, it will reduce the pH and viscosity of the preparation, increase the particle size, the uniformity of droplet size uniformity, but does not affect the potential zeta value. The best formula is F2.

pH Effects on solubility, zeta potential, and correlation between antibacterial activity and molecular weight of chitosan

2015 ◽  
Vol 134 ◽  
pp. 74-81 ◽  
Author(s):  
Shun-Hsien Chang ◽  
Hong-Ting Victor Lin ◽  
Guan-James Wu ◽  
Guo Jane Tsai
Keyword(s):  
Molecular Weight ◽  
Antibacterial Activity ◽  
Zeta Potential ◽  
Ph Effects

scholarly journals PENGARUH KONSENTRASI SURFAKTAN TERHADAP KARAKTERISTIK FISIK NANOEMULSI DAN NANOEMULSI GEL KOENZYM Q10

2019 ◽  
Vol 4 (2) ◽  
pp. 143
Author(s):  
Silvi Ayu Wulansari ◽  
Ririn Sumiyani ◽  
Ni Luh Dewi Aryani
Keyword(s):  
Zeta Potential ◽  
Droplet Size ◽  
Coenzyme Q10 ◽  
Surfactant Concentration ◽  
Rice Bran Oil ◽  
Physical Characteristics ◽  
Polydispersity Index ◽  
Large Molecular Weight ◽  
Nanoemulsion Gel ◽  
Koenzym Q10

Coenzyme Q10 is a compound that functions as an antioxidant with a large molecular weight of 863.36 g/mol and has lipophilic properties. This makes coenzyme Q10 need to be formulated to improve the solubility of the material and the delivery system in the skin. This study aims to determine the effect of surfactant variations (a combination of PEG-40 HCO and Span 80) on the physical characteristics of nanoemulsion and nanoemulsion gel preparations. Coenzyme Q10 is formulated using the rice bran oil oil phase with the combination surfactant. This research was made in 3 nanoemulsion formulas  FI, F2, F3 and 3 nanoemulsion gel formulas  F4, F5, F6. Evaluation of physical characteristics is done after 24 hours after the preparation is complete, observations made include organoleptic (shape, color and phase formed), pH, viscosity, droplet size, zeta potential and polydispersity index. The research data were processed statistically using the Kruskal-Wallis analysis and Mann-Whitney follow-up tests. The results showed that the surfactant concentration affected physical characteristics (viscosity, droplet size, zeta potential and polydispersity index) with a significantly different result (p <0.05) but the surfactant concentration did not affect the pH with the results not significantly different (p> 0.05)

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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