1
|
Sarkar P, Ghimire S, Vlasov S, Mukhopadhyay K. Effect of clay-zwitterionic interactions in controlling the viscoelastic properties in organomodified clays. iScience 2023; 26:108388. [PMID: 38047072 PMCID: PMC10690574 DOI: 10.1016/j.isci.2023.108388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 10/06/2023] [Accepted: 10/31/2023] [Indexed: 12/05/2023] Open
Abstract
Investigating the rheology of 2D materials such as clays is of growing interest in various applications as it dictates their flowability and structural stability. Clay minerals present unique rheological properties, especially when in suspension. This study explores the effect of functionalizing bentonite clay with betaines of variable carbon chain lengths on the rheological properties of clay slurries to analyze their interactions in suspension. The results show that these zwitterion-functionalized clays exhibit higher viscosity, storage moduli, and flow stresses due to the formation of three-dimensional networks and increased aggregation caused by intercalation. The structural properties of the clay slurries are also found to be pH-sensitive. Additionally, XRD and SEM analyses support the proposed intercalation of the clays. The findings suggest the potential application of small-chain betaine functionalized clays in engineering and energy applications. Overall, this study provides insight into predicting the stability and strength of functionalized clay suspensions.
Collapse
Affiliation(s)
- Pritha Sarkar
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Suvash Ghimire
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Sergey Vlasov
- Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA
| | - Kausik Mukhopadhyay
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
- Advanced Materials Processing and Analysis Centre, University of Central Florida, Orlando, FL 32816, USA
| |
Collapse
|
2
|
Wang Y, Chen X, Wang F, Cheng N. Influence of typical clay minerals on aggregation and settling of pristine and aged polyethylene microplastics. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 316:120649. [PMID: 36375574 DOI: 10.1016/j.envpol.2022.120649] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 11/06/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
Microplastics (MPs) are emerging as a class of pollutants that are a potential threat to biological and human health. Aggregation and settling are crucial to controlling MPs transport and environmental fate. However, the influence of clay minerals in the aqueous environment on the aggregation-settling processes of larger size MPs and its mechanisms remain unclear. In this study, homoaggregation of pristine and aged polyethylene microplastics (PEs) and heteroaggregation-settling of PEs with typical clay minerals (chlorite, illite, kaolinite, montmorillonite) under different hydrochemical conditions (NaCl, CaCl2, MgCl2) were systematically investigated. The results showed that the cation type has a greater influence on the homoaggregation system. In detail, the aged PEs is more stable than pristine PEs in monovalent electrolyte solutions, but not in divalent electrolytes. In heteroaggregation systems, electrostatic repulsion dominates the interaction of PEs (pristine, aged) with clay minerals. However, the settling ratio of PEs (pristine, aged) contributed by clay minerals is not very dependent on the clay mineral type. Conversely, high NaCl concentrations are more conducive to the heteroaggregation-settling of PEs, which can be explained by the DLVO theory. The findings of this study provide new insights into the environmental fate and distribution of MPs in natural waters.
Collapse
Affiliation(s)
- Yi Wang
- Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters, Fujian Normal University, Fuzhou, 350007, China; School of Geographical Sciences, Fujian Normal University, Fuzhou, China, Fuzhou, 350007, China; State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou, 350007, China
| | - Xingwei Chen
- Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters, Fujian Normal University, Fuzhou, 350007, China; School of Geographical Sciences, Fujian Normal University, Fuzhou, China, Fuzhou, 350007, China; State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou, 350007, China.
| | - Feifeng Wang
- Fujian Province Key Laboratory of Pollution Control and Resource Recycling, Fuj Ian Normal University, Fuzhou, 350007, China
| | | |
Collapse
|
3
|
Li Y, Li H, Jin C, Zhao B, Wu Y. Synthesis of polycarboxylate superplasticizer modified by
β
‐cyclodextrin for possessing clay tolerance. J Appl Polym Sci 2022. [DOI: 10.1002/app.51918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yue Li
- Key Laboratory of Urban Security and Disaster Engineering, MOE Beijing University of Technology, Beijing University of Technology Beijing China
| | - Hongwen Li
- Key Laboratory of Urban Security and Disaster Engineering, MOE Beijing University of Technology, Beijing University of Technology Beijing China
| | - Caiyun Jin
- Faculty of Science Beijing University of Technology Beijing China
| | - Bingyin Zhao
- College of Civil Engineering Zhengzhou Institute of Finance and Economics Zhengzhou China
| | - Yusheng Wu
- China Building Materials Inspection and Certification Group Xiamen Hongye Company Xiamen China
| |
Collapse
|
4
|
Shoaib M, Khan S, Wani OB, Abdala A, Seiphoori A, Bobicki ER. Modulation of soft glassy dynamics in aqueous suspensions of an anisotropic charged swelling clay through pH adjustment. J Colloid Interface Sci 2022; 606:860-872. [PMID: 34425273 DOI: 10.1016/j.jcis.2021.08.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/06/2021] [Accepted: 08/06/2021] [Indexed: 10/20/2022]
Abstract
HYPOTHESIS Sodium-montmorillonite (Na-Mt) particles are geometrically anisometric that carry a pH dependent anisotropic surface charge. Therefore, it should be possible to manipulate the particle-particle interaction of colloidal range Na-Mt suspensions through pH changes which in turn should alter the soft glassy dynamics of Na-Mt suspensions. EXPERIMENTS Rheological experiments were used to probe the impact of pH mediated colloidal particle-particle interaction on the physical aging, linear viscoelastic response, and yield stress behavior of Na-Mt suspension. FINDINGS The temporal evolution of the storage modulus (G') was stronger in the acid regime (pH < 9.5) than the base (pH ≥ 9.5) pH regime. Horizontal shifting of the aging curves in the acid and base regimes led to aging time-H+ concentration and aging time-OH- concentration superposition. An aging time-Na-Mt concentration superposition was also observed in both pH regimes. The critical stress associated with the viscosity bifurcation behavior increased linearly with G' but with different slopes for acid and base regime. We propose that positively charged patches on the Na-Mt particle edge merge with the characteristic surface as a function of H+ ions in the system. This leads to a strongly associated microstructure at low pH and a relatively weak but associated microstructure at natural pH, hence confirming the hypothesis.
Collapse
Affiliation(s)
- Mohammad Shoaib
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada Ontario, M5S 3E5, Canada.
| | - Shaihroz Khan
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada Ontario, M5S 3E5, Canada
| | - Omar Bashir Wani
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada Ontario, M5S 3E5, Canada
| | - Ahmed Abdala
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874, Doha, Qatar.
| | - Ali Seiphoori
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Erin R Bobicki
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada Ontario, M5S 3E5, Canada.
| |
Collapse
|
5
|
Use of Multi-Anionic Sodium Tripolyphosphate to Enhance Dispersion of Concentrated Kaolin Slurries in Seawater. METALS 2021. [DOI: 10.3390/met11071085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This research aims to analyze the impact of sodium tripolyphosphate (STPP) as a rheological modifier of concentrated kaolin slurries in seawater at pH 8, which is characteristic of copper sulfide processing operations. The dispersion phenomenon was analyzed through chord length measurements using the focused beam reflectance measurement (FBRM) technique, complementing size distributions in unweighted and square-weighted modes. The reduction of the rheological properties was significant, decreasing from 231 Pa in a reagent-free environment to 80 Pa after the application of STPP. A frequency sweep in a linear viscoelastic regime indicated that by applying a characteristic dosage of 0.53 kg/t of STPP, the pulp before yielding increases its phase angle, which increases its liquid-like character. Measurements of the chord length verified the dispersion of particles, which showed an apparent increase in the proportion of fine particles and a reduction of the coarser aggregates when STPP was applied. Measurements of the zeta potential suggested that the high anionic charge of the reagent (pentavalent) increases the electrostatic repulsions between particles, overcoming the effect of cations in seawater. The results are relevant for the mining industry, especially when the deposits have high contents of complex gangues, such as clays, that increase the rheological properties. This increases the energy costs and water consumption needed for pumping the tailings from thickeners to the tailing storages facilities. The strategies that allow for the improvement of the fluidity and deformation of the tailings generate slack in order to maximize water recovery in the thickening stages.
Collapse
|
6
|
DFT study of the adsorption of 2,3-epoxypropyltrimethylammonium chloride on montmorillonite surfaces. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116145] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
7
|
Wei X, Pan D, Xu Z, Xian D, Li X, Tan Z, Liu C, Wu W. Colloidal stability and correlated migration of illite in the aquatic environment: The roles of pH, temperature, multiple cations and humic acid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 768:144174. [PMID: 33453530 DOI: 10.1016/j.scitotenv.2020.144174] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 11/13/2020] [Accepted: 11/30/2020] [Indexed: 06/12/2023]
Abstract
The mobility and environmental risk of colloids and associated pollutants are dependent on their dispersion stability under various conditions. In this work, the stability and correlated migration of illite colloids (IC) were systematically investigated over a wide range of aquatic chemistry conditions. The results showed that IC was aggregation favorable at low pH, low temperature and high ionic strength. The critical coagulation concentration (CCC) of IC increased exponentially with increasing values of r/Z3, following the Schulze-Hardy and Hofmeister series. Humic acid (HA) greatly mitigated colloid aggregation since the attachment of HA on IC surface increased the steric hindrance and electrostatic potential, and the enhancement of stability was linearly correlated with the HA concentration. The Derjaguin-Landau-Verwey-Overbeek (DLVO) model revealed that the interaction force deriving from van der Waals forces and electrostatic double-layer energy evolved as the aquatic chemistry varied, and the reduction in repulsion force between particles facilitated the colloid collision and then aggregation. The migration of IC in the porous sand column was highly correlated with the dispersion stability and filtration effect, the agglomerated colloids were redispersed and released when conditions favored dispersion. The illite colloids acted as efficient carriers for Eu(III) transport. These findings are essential for improving the understanding of the geological fate of environmental colloids and associated radionuclides.
Collapse
Affiliation(s)
- Xiaoyan Wei
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Duoqiang Pan
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Zhen Xu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Dongfan Xian
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry and Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiaolong Li
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
| | - Zhaoyi Tan
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
| | - Chunli Liu
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry and Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Wangsuo Wu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| |
Collapse
|
8
|
Farag RM, Salem AM, El-Midany AA, El-Mofty SE. Bentonite Suspension Filtration and its Electro-Kinetics in the Presence of Additives. TENSIDE SURFACT DET 2021. [DOI: 10.1515/tsd-2020-2257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Invasion of fluids into porous media during drilling can lead to irreparable damage and reduced well productivity. Hence, minimizing the filtration loss of the drilling fluid into the formation is very important. The stability of colloidal suspensions plays a crucial role in controlling the interfacial forces and consequently on minimizing the filtration. The zeta potential is an indicator of the stability of colloids with respect to their electrostatic interactions. In this study, the rheological properties of bentonite suspensions are investigated with and without additives. The starch and CMC were used as additives to enhance the rheological properties of bentonite. The effects of these additives on the drilling fluid filtration were examined. Zeta-potential, viscosity, gel strength and yield point were measured to characterize the extent to which control of the filtration loss of the drilling fluids can be achieved. The zeta-potential and the amount of filtration loss of water-bentonite suspensions were correlated. Finally, the results showed that the addition of either starch or carboxymethyl cellulose (CMC) enhances the filtration properties of water-bentonite suspensions.
Collapse
Affiliation(s)
- R. M. Farag
- Mining Petroleum and Metallurgical Engineering Dept., Cairo University , Cairo . Egypt
| | - A. M. Salem
- Petroleum Engineering Dept., Suez University , Suez . Egypt
| | - A. A. El-Midany
- Mining Petroleum and Metallurgical Engineering Dept., Cairo University , Cairo . Egypt
| | - S. E. El-Mofty
- Civil Engineering Dept, faculty of Engineering, Bisha University , Bisha Saudi Arabia
| |
Collapse
|
9
|
Metaxas AE, Panwar V, Olson RL, Dutcher CS. Ionic strength and polyelectrolyte molecular weight effects on floc formation and growth in Taylor-Couette flows. SOFT MATTER 2021; 17:1246-1257. [PMID: 33300931 DOI: 10.1039/d0sm01517b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Polyelectrolyte-driven flocculation of suspended particulate in solution is an important process in a variety of industrial processes such as drinking water treatment and composite material synthesis. Flocculation depends on a wide variety of physicochemical and hydrodynamic properties, which affect floc size, growth rate, and floc morphology. Floc formation and growth behavior is explored here using two different molecular weights of a cationic polyacrylamide flocculant and anisotropic Na-bentonite clay particles under a variety of solution ionic strengths. A Taylor-Couette cell with radial injection capabilities was used to study the effects of solution ionic strength and polyelectrolyte molecular weight on floc size, growth rate, and floc morphology during the flocculation process with a constant global velocity gradient. The floc size generally decreased with increasing ionic strength whereas the floc growth rate initially increased then decreased. This likely occurred due to charge screening effects, where increased bentonite aggregate size and a less expanded polyelectrolyte conformation at higher ionic strengths results in a decreased ability for the polyelectrolyte to bridge multiple bentonite aggregates. The densification of bentonite aggregates at higher ionic strengths resulted in floc morphologies that were more resistant to shear-induced breakage. With the exceptions of optimal dose concentration and dispersion coefficients, there were no clear differences in the floc growth rate behaviors for the two molecular weights studied. This work contributes to an improved understanding of the physicochemical complexities of polyelectrolyte-driven flocculation that can inform dosing requirements for more efficient industrial operations.
Collapse
Affiliation(s)
- Athena E Metaxas
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, 421 Washington Avenue SE, Minneapolis, MN 55455, USA.
| | - Vishal Panwar
- Department of Mechanical Engineering, University of Minnesota - Twin Cities, 111 Church Street SE, Minneapolis, MN 55455, USA
| | - Ruth L Olson
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Cari S Dutcher
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, 421 Washington Avenue SE, Minneapolis, MN 55455, USA. and Department of Mechanical Engineering, University of Minnesota - Twin Cities, 111 Church Street SE, Minneapolis, MN 55455, USA
| |
Collapse
|
10
|
Sun Y, Pan D, Wei X, Xian D, Wang P, Hou J, Xu Z, Liu C, Wu W. Insight into the stability and correlated transport of kaolinite colloid: Effect of pH, electrolytes and humic substances. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115189. [PMID: 32683164 DOI: 10.1016/j.envpol.2020.115189] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 07/03/2020] [Accepted: 07/04/2020] [Indexed: 06/11/2023]
Abstract
Environmental colloids play crucial roles in the transport of environmental pollutants in porous media by acting as pollutant carriers. In this work, the dispersion stability and correlated transport of kaolinite colloid were investigated as a function of solution pH, solution ionic strength, and concentration of humic acid (HA), the roles of kaolinite colloid in driving Eu(III) transport were discussed. The results showed that the dispersion of kaolinite colloid was favorable at alkaline and extremely acidic pH values, the trend of aggregation with varying pH was critically reversed at pH ∼3.2 due to the transformation of surface electrical properties. Cations with higher valence and mineral affinity showed a more significant contribution in inducing colloid aggregation, which was generally in accordance with the Schulze-Hardy rule and Hofmeister series. HA greatly increased the colloid stability by altering the surface electrostatic potential and steric effect. The Derjguin-Landau-Verwey-Overbeek (DLVO) model suggested that the electrostatic force between colloidal particles controlled the aggregation and destabilizing trend of colloid, and the theoretically calculated critical coagulation concentration was consistent with that determined from kinetic aggregation experiments. The roles of kaolinite colloid in driving Eu(III) transport varied under different conditions, and the transport behavior was highly correlated with the dispersion stability trend of colloid. These results can provide an enhanced understanding of the environmental fate of kaolinite colloid as well as commensal pollutants.
Collapse
Affiliation(s)
- Yalou Sun
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| | - Duoqiang Pan
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China.
| | - Xiaoyan Wei
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| | - Dongfan Xian
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry and Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China
| | - Peng Wang
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| | - Junjun Hou
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| | - Zhen Xu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| | - Chunli Liu
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry and Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China
| | - Wangsuo Wu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| |
Collapse
|
11
|
Abrougui MM, Srasra E, Lopez-Lopez MT, Duran JDG. Rheology of magnetic colloids containing clusters of particle platelets and polymer nanofibres. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2020; 378:20190255. [PMID: 32279638 PMCID: PMC7202764 DOI: 10.1098/rsta.2019.0255] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/25/2019] [Indexed: 05/18/2023]
Abstract
Magnetic hydrogels (ferrogels) are soft materials with a wide range of applications, especially in biomedicine because (i) they can be provided with the required biocompatibility; (ii) their heterogeneous structure allows their use as scaffolds for tissue engineering; (iii) their mechanical properties can be modified by changing different design parameters or by the action of magnetic fields. These characteristics confer them unique properties for acting as patterns that mimic the architecture of biological systems. In addition, and (iv) given their high porosity and aqueous content, ferrogels can be loaded with drugs and guided towards specific targets for local (non-systemic) pharmaceutical treatments. The ferrogels prepared in this work contain magnetic particles obtained by precipitation of magnetite nanoparticles onto the porous surface of bentonite platelets. Then, the particles were functionalized by adsorption of alginate molecules and dispersed in an aqueous solution of sodium alginate. Finally, the gelation was promoted by cross-linking the alginate molecules with Ca2+ ions. The viscoelastic properties of the ferrogels were measured in the absence/presence of external magnetic fields, showing that these ferrogels exhibited a strong enough magnetorheological effect. This behaviour is explained considering the field-induced strengthening of the heterogeneous (particle-polymer) network generated inside the ferrogel. This article is part of the theme issue 'Patterns in soft and biological matters'.
Collapse
Affiliation(s)
- Mariem Mekni Abrougui
- Centre National des Recherches en Sciences des Materiaux, Technopole Borej Cedria, BP 73, 8027 Soliman, Tunisia
- Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunisie B.P., 94-Rommana 1068, Tunisia
| | - Ezzeddine Srasra
- Centre National des Recherches en Sciences des Materiaux, Technopole Borej Cedria, BP 73, 8027 Soliman, Tunisia
- Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunisie B.P., 94-Rommana 1068, Tunisia
| | - Modesto T. Lopez-Lopez
- Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
| | - Juan D. G. Duran
- Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
- e-mail:
| |
Collapse
|
12
|
Tunable Dewatering Behavior of Montmorillonite Suspension by Adjusting Solution pH and Electrolyte Concentration. MINERALS 2020. [DOI: 10.3390/min10040293] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Montmorillonite is always a troublemaker for the dewatering in coal processing since its existence can decrease the rates of sedimentation and filtration of coal slurry. To eliminate the adverse effect of montmorillonite, adjusting the slurry pH and adding electrolytes are always the key methods. However, the underlying mechanism still needs to be further studied. The dewatering of Na-montmorillonite (Na-Mt) suspensions has been studied as a function of NaCl concentration (10−3, 10−2, and 10−1 M) at different pH values (6.0, 7.7, 8.1, 9.2). The point of zero charge of edge surface of Na-Mt (pHPZC,edge) appeared at the pH value of 6.8. The sedimentation and rheology experiments described the coagulation and flow behaviors of Na-Mt suspensions, respectively. The Na-Mt suspension coagulated spontaneously at low salt concentration with the pH ~ 6.0. For the pH > pHPZC,edge, the height of the sediment bed reduced and apparent viscosity increased with the increase of the electrolyte concentration. The filtration properties were evaluated on the basis of Darcy’s law. The obtained result clearly demonstrated that the filtration rate was accelerated with the increase of pH and electrolyte concentration. The modes of particle association and its effect on filtration performance were discussed. Moreover, a comparison with related results from the literature was performed. At pH ~ 6 and low electrolyte concentration, the positively charged Edge surfaces and negatively charged Face surfaces coagulate rapidly to form a sealed structure by electrostatic attraction. Furthermore, inside this sealed structure, the water molecules cannot be removed in the filtration process easily. However, by increasing the electrolyte concentration at pH > pHPZC,edge, the gradually formed Face/Face structure increases the filtration rate sharply because of the inhibiting effect of the electric double layer (EDL) and the osmotic expansion. Therefore, adjusting solution conditions of the aqueous suspension to tune the particle coagulation behavior is one of the effective methods to solve the problem of montmorillonite dewatering.
Collapse
|
13
|
Pore scale investigation of low salinity surfactant nanofluid injection into oil saturated sandstone via X-ray micro-tomography. J Colloid Interface Sci 2020; 562:370-380. [DOI: 10.1016/j.jcis.2019.12.043] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 12/10/2019] [Accepted: 12/11/2019] [Indexed: 11/21/2022]
|
14
|
Cui W, Jiang G, He Y. New structure found in a filter cake with the addition of an amphoteric polymer fluid loss additive. J Appl Polym Sci 2019. [DOI: 10.1002/app.47965] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wuge Cui
- State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum Beijing 102249 China
- Ministry of Education Key Laboratory of Petroleum EngineeringChina University of Petroleum Changping District Beijing 102249 China
| | - Guancheng Jiang
- State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum Beijing 102249 China
- Ministry of Education Key Laboratory of Petroleum EngineeringChina University of Petroleum Changping District Beijing 102249 China
| | - Yinbo He
- State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum Beijing 102249 China
- Ministry of Education Key Laboratory of Petroleum EngineeringChina University of Petroleum Changping District Beijing 102249 China
| |
Collapse
|
15
|
Asamoah RK, Skinner W, Addai-Mensah J. Pulp mineralogy and chemistry, leaching and rheological behaviour relationships of refractory gold ore dispersions. Chem Eng Res Des 2019. [DOI: 10.1016/j.cherd.2019.04.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
16
|
Abrougui MM, Lopez-Lopez MT, Duran JDG. Mechanical properties of magnetic gels containing rod-like composite particles. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2019; 377:20180218. [PMID: 30827211 PMCID: PMC6460065 DOI: 10.1098/rsta.2018.0218] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/06/2018] [Indexed: 05/29/2023]
Abstract
Magnetic gels (ferrogels) are heterogeneous systems structured at the nanoscale that contains magnetic particles dispersed in three-dimensional networks of polymer chains. In the present work, the magnetic particles were synthesized with a core-shell structure, consisting of sepiolite particles covered by magnetite nanoparticles. These composite particles had a rod-like shape with a high aspect ratio. The obtained sepiolite-magnetite particles showed a high enough susceptibility and saturation magnetization. The magneto-rheological (MR) properties, and the intensity of the MR effect, of aqueous suspensions of the synthesized particles were studied. The particles, functionalized by adsorption of alginate molecules, were imbedded in alginate hydrogels to get homogeneous soft materials. The particles were linked to the polymer chains as the knots in a network and dominated in a great extent the mechanical properties of the materials. After determining the optimal compositions of the ferrogels, their viscoelastic properties were measured in the absence/presence of magnetic fields. The results pointed out that the MR effect provided by the clay-magnetite particles was considerably more intense than those achieved in ferrogels that contain spherical magnetic microparticles. Therefore, the imbedding of rod-shaped magnetic particles in hydrogels allows controlling the mechanical properties in a wider range than in conventional ferrogels. This article is part of the theme issue 'Heterogeneous materials: metastable and non-ergodic internal structures'.
Collapse
Affiliation(s)
- Mariem M. Abrougui
- Centre National des Recherches en Sciences des Materiaux, Technopole Borej Cedria, BP 73, 8027 Soliman, Tunisia
- Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunisie B.P. 94, Rommana 1068, Tunisia
| | - Modesto T. Lopez-Lopez
- Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
| | - Juan D. G. Duran
- Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
| |
Collapse
|
17
|
Osuna FJ, Cota A, Fernández MA, Pavón E, Torres Sánchez RM, Alba MD. Influence of framework and interlayer on the colloidal stability of design swelling high-charged micas. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.09.086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
18
|
Metaxas A, Wilkinson N, Raethke E, Dutcher CS. In situ polymer flocculation and growth in Taylor-Couette flows. SOFT MATTER 2018; 14:8627-8635. [PMID: 30328465 DOI: 10.1039/c8sm01694a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Flocculation of small particulates suspended in solution is a key process in many industries, including drinking water treatment. The particles are aggregated during mixing to form larger aggregates, known as flocs, through use of a polyelectrolyte flocculant. The flocculation of these particulates in water treatment, however, are subject to a wide spatial variation of hydrodynamic flow states, which has consequences for floc size, growth rate, and microstructure. Floc assembly dynamics are explored here using a commercially available cationic polyacrylamide, commonly used in water treatment, and anisotropic Na-bentonite clay particles under a variety of hydrodynamic mixing conditions. A Taylor-Couette cell with the unique ability to radially inject fluid into the rotating annulus was used to study how specific hydrodynamic flow fields affect assembly and structure of these materials during the flocculation process. Faster floc growth rates and decreased floc fractal dimensions were observed for higher order flow states, indicating improved mass transfer of the polymer flocculant and breakage at the edges of the flocs (shear rounding), respectively. This work sheds more light on the complexities of polymer-induced flocculation, towards improving dosing and efficiency of large-scale operations.
Collapse
Affiliation(s)
- Athena Metaxas
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, 421 Washington Ave SE, Minneapolis, MN 55455, USA
| | | | | | | |
Collapse
|
19
|
Dynamic Behavior of Dilute Bentonite Suspensions under Different Chemical Conditions Studied via Magnetic Resonance Imaging Velocimetry. COLLOIDS AND INTERFACES 2018. [DOI: 10.3390/colloids2040041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study investigates dilute aqueous suspensions of bentonite particles using magnetic resonance imaging (MRI) velocimetry. Four different chemical conditions are tested to investigate the influence of pH and type of monovalent electrolyte on the local rheological behavior of bentonite suspensions. The results indicate the shear banding in a dilute suspension of 0.1 vol.% solid due to the formation of a continuous three-dimensional particle network under a certain chemical environment (i.e., pH 4 in 1 × 10−2 M KNO3). This network is responsible for the existence of the yield stress in that dilute suspension. Structural changes induced by modification of suspensions’ chemistry are examined via scanning electron microscopy. A previously established method based on processing the torques acquired via conventional rheometric measurement is also applied as an alternative way to recover local flow information. Within the shear rate range covered by our MRI velocimetry, the results of both methods show good agreement. This study suggests that the existence of a master curve (or global flow curve) for dilute suspensions is dependent on the bentonite particle organization, which is influenced by the suspension chemistry and the previous flow history.
Collapse
|
20
|
García-Guzmán P, Medina-Torres L, Calderas F, Bernad-Bernad MJ, Gracia-Mora J, Mena B, Manero O. Characterization of hybrid microparticles/Montmorillonite composite with raspberry-like morphology for Atorvastatin controlled release. Colloids Surf B Biointerfaces 2018; 167:397-406. [DOI: 10.1016/j.colsurfb.2018.04.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 03/22/2018] [Accepted: 04/04/2018] [Indexed: 11/30/2022]
|
21
|
Ozkan A, Sener A, Ucbeyiay H. Investigation of coagulation and electrokinetic behaviors of clinoptilolite suspension with multivalent cations. SEP SCI TECHNOL 2018. [DOI: 10.1080/01496395.2017.1380669] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- A Ozkan
- Department of Mining Engineering, Selcuk University, Konya, Turkey
| | - A.G Sener
- Department of Mining Engineering, Selcuk University, Konya, Turkey
| | - H Ucbeyiay
- Department of Mining Engineering, Necmettin Erbakan University, Konya, Turkey
| |
Collapse
|
22
|
pH dependence of bentonite aggregate size and morphology on polymer-clay flocculation. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
23
|
Leroy P, Weigand M, Mériguet G, Zimmermann E, Tournassat C, Fagerlund F, Kemna A, Huisman JA. Spectral induced polarization of Na-montmorillonite dispersions. J Colloid Interface Sci 2017; 505:1093-1110. [DOI: 10.1016/j.jcis.2017.06.071] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 05/27/2017] [Accepted: 06/20/2017] [Indexed: 11/25/2022]
|
24
|
Wilkinson N, Metaxas A, Brichetto E, Wickramaratne S, Reineke TM, Dutcher CS. Ionic strength dependence of aggregate size and morphology on polymer-clay flocculation. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.06.085] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
|
25
|
Chen T, Zhao Y, Song S. Correlation of electrophoretic mobility with exfoliation of montmorillonite platelets in aqueous solutions. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.04.057] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
26
|
Electrophoretic mobility study for heterocoagulation of montmorillonite with fluorite in aqueous solutions. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2016.12.086] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
27
|
Aggregation Mechanism of Particles: Effect of Ca2+ and Polyacrylamide on Coagulation and Flocculation of Coal Slime Water Containing Illite. MINERALS 2017. [DOI: 10.3390/min7020030] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
28
|
Song Y, Hagen DA, Qin S, Holder KM, Falke K, Grunlan JC. Edge Charge Neutralization of Clay for Improved Oxygen Gas Barrier in Multilayer Nanobrick Wall Thin Films. ACS APPLIED MATERIALS & INTERFACES 2016; 8:34784-34790. [PMID: 27998112 DOI: 10.1021/acsami.6b12937] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Layer-by-layer (LbL) assembled polymer-clay multilayer thin films are known to provide transparent and flexible gas barrier. In an effort to further lower the oxygen transmission rate (OTR) of these nanobrick wall thin films, sodium chloride was introduced into montmorillonite (MMT) suspension as an "indifferent electrolyte". At pH 6.5 the amphoteric edge sites of MMT have a neutral net charge, and a moderate concentration of NaCl effectively shields the charge from neighboring platelets, allowing van der Waals forces to attract the edges to one another. This edge-to-edge bonding creates a much more tortuous path for diffusing oxygen molecules. An eight-bilayer (BL) polyethylenimine (PEI)/MMT multilayer coating (∼50 nm thick), assembled with 5 mM NaCl in the aqueous clay suspension, exhibited an order of magnitude reduction in oxygen permeability (∼4 × 10-20 cm3·cm/(cm2·Pa·s)) relative to its salt-free counterpart. This result represents the best barrier among polymer-clay bilayer systems, which is also lower than SiOx or AlxOy thin films. At higher NaCl concentration, the strong charge screening causes edge-to-face bonding among MMT nanoplatelets, which leads to misalignment in assembled films and increased OTR. This "salty-clay" strategy provides an efficient way to produce better multilayer oxygen barrier thin films by altering ionic strength of the MMT suspension. This simple modification reduces the number of layers necessary for high gas barrier, potentially making these multilayer films interesting for commercial packaging applications.
Collapse
Affiliation(s)
- Yixuan Song
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - David A Hagen
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Shuang Qin
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Kevin M Holder
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Kyle Falke
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Jaime C Grunlan
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States
| |
Collapse
|
29
|
Kosmulski M. Isoelectric points and points of zero charge of metal (hydr)oxides: 50years after Parks' review. Adv Colloid Interface Sci 2016; 238:1-61. [PMID: 27890403 DOI: 10.1016/j.cis.2016.10.005] [Citation(s) in RCA: 178] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 10/27/2016] [Accepted: 10/28/2016] [Indexed: 02/06/2023]
Abstract
The pH-dependent surface charging of metal (hydr)oxides is reviewed on the occasion of the 50th anniversary of the publication by G.A. Parks: "Isoelectric points of solid oxides, solid hydroxides, and aqueous hydroxo complex systems" in Chemical Reviews. The point of zero charge (PZC) and isoelectric point (IEP) became standard parameters to characterize metal oxides in aqueous dispersions, and they define adsorption (surface excess) of ions, stability against coagulation, rheological properties of dispersions, etc. They are commonly used in many branches of science including mineral processing, soil science, materials science, geochemistry, environmental engineering, and corrosion science. Parks established standard procedures and experimental conditions which are required to obtain reliable and reproducible values of PZC and IEP. The field is very active, and the number of related papers exceeds 300 a year, and the standards established by Parks remain still valid. Relevant experimental techniques improved over the years, especially the measurements of electrophoretic mobility became easier and more reliable, are the numerical values of PZC and IEP compiled by Parks were confirmed by contemporary publications with a few exceptions. The present paper is an up-to-date compilation of the values of PZC and IEP of metal oxides. Unlike in former reviews by the same author, which were more comprehensive, only limited number of selected results are presented and discussed here. On top of the results obtained by means of classical methods (titration and electrokinetic methods), new methods and correlations found over the recent 50years are presented.
Collapse
|
30
|
Ali S, Bandyopadhyay R. Effect of electrolytes on the microstructure and yielding of aqueous dispersions of colloidal clay. SOFT MATTER 2016; 12:414-421. [PMID: 26477340 DOI: 10.1039/c5sm01700a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Na-montmorillonite is a natural clay mineral and is available in abundance in nature. The aqueous dispersions of charged and anisotropic platelets of this mineral exhibit non-ergodic kinetically arrested states ranging from soft glassy phases dominated by interparticle repulsions to colloidal gels stabilized by salt induced attractive interactions. When the salt concentration in the dispersing medium is varied systematically, viscoelasticity and yield stress of the dispersion show non-monotonic behavior at a critical salt concentration, thus signifying a morphological change in the dispersion microstructures. We directly visualize the microscopic structures of these kinetically arrested phases using cryogenic scanning electron microscopy. We observe the existence of honeycomb-like network morphologies for a wide range of salt concentrations. The transition of the gel morphology, dominated by overlapping coin (OC) and house of cards (HoC) associations of clay particles at low salt concentrations to a new network structure dominated by face-face coagulation of platelets, is observed across the critical salt concentration. We further assess the stability of these gels under gravity using electroacoustics. This study, performed for concentrated clay dispersions for a wide concentration range of externally added salt, is useful in our understanding of many geophysical phenomena that involve the salt induced aggregation of natural clay minerals.
Collapse
Affiliation(s)
- Samim Ali
- Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bangalore 560080, India.
| | | |
Collapse
|
31
|
Das K, Rawat K, Bohidar HB. Surface patch binding induced interaction of anisotropic nanoclays with globular plasma proteins. RSC Adv 2016. [DOI: 10.1039/c6ra11669h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Morphology dependent interaction of model anisotropic nanoparticles with globular plasma proteins.
Collapse
Affiliation(s)
- Kishan Das
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Kamla Rawat
- Special Center for Nanosciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
- Inter University Accelerator Centre (IUAC)
| | - H. B. Bohidar
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
- Special Center for Nanosciences
| |
Collapse
|
32
|
Leroy P, Tournassat C, Bernard O, Devau N, Azaroual M. The electrophoretic mobility of montmorillonite. Zeta potential and surface conductivity effects. J Colloid Interface Sci 2015; 451:21-39. [DOI: 10.1016/j.jcis.2015.03.047] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 03/25/2015] [Indexed: 10/23/2022]
|
33
|
Oliyaei N, Aalaie J, Barati A, Miri T. Study on Steady Shear Rheological Behavior of Concentrated Suspensions of Sulfonated Polyacrylamide/Na-Montmorillonite Nanoparticles. J MACROMOL SCI B 2015. [DOI: 10.1080/00222348.2015.1029420] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
34
|
Benyounes K, Benmounah A. Rheological and electrokinetic characterization of bentonite particles in aqueous phase in presence of KCl. PARTICULATE SCIENCE AND TECHNOLOGY 2015. [DOI: 10.1080/02726351.2015.1042563] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
35
|
Hristova SH, Zhivkov AM. Adsorption of cytochrome c on montmorillonite nanoplates: Protein concentration dependence. J Colloid Interface Sci 2015; 446:252-62. [DOI: 10.1016/j.jcis.2015.01.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 01/05/2015] [Accepted: 01/13/2015] [Indexed: 11/25/2022]
|
36
|
Ganley WJ, van Duijneveldt JS. Controlling Clusters of Colloidal Platelets: Effects of Edge and Face Surface Chemistries on the Behavior of Montmorillonite Suspensions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4377-4385. [PMID: 25815435 DOI: 10.1021/acs.langmuir.5b00047] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The structural and rheological consequences of adsorbing pyrophosphate anions to the edges and polyetheramines to the faces of montmorillonite platelets in aqueous suspension were investigated. Oscillatory rheology and scattering experiments showed that the two surface treatments act in different regions of the phase diagram and that this can be attributed to modifications of local particle interactions resulting in changes to the behavior and morphology of platelet clusters. The polyetheramine was found to neutralize surface charge, reducing electrostatic repulsion between platelets and therefore allowing them to come into closer proximity. This reduces the effective volume fraction of the clusters and reverses jamming in low ionic strength arrested phases. Conversely, the adsorption of pyrophosphate was found to introduce a high concentration of negative charge to the particle edge, resisting the formation of bonded percolating gels at high ionic strength. The two separate surface chemistries can be applied in parallel with no adverse effects and thus have the potential to be applied to dual functionalization of two-dimensional colloids such as platelets. This has implications for finer formulation design where targeted rheology modification could be achieved by careful selection of chemistry at one surface accompanied by an additional function at the other.
Collapse
Affiliation(s)
- William J Ganley
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | | |
Collapse
|
37
|
Khalil EA, Majid SA, Suaifan GARY, Al-Akayleh FT, Sallam ASA. Physicochemical characterization of emulgel formulated with SepineoP 600, SepineoSE 68 and cosolvent mixtures. Pharm Dev Technol 2015; 21:519-27. [DOI: 10.3109/10837450.2015.1022789] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Enam A. Khalil
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, The University of Jordan, Amman, Jordan,
| | - Samia A. Majid
- Faculty of Pharmacy, The University of Jordan, Amman, Jordan,
| | - Ghadeer A. R. Y. Suaifan
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, The University of Jordan, Amman, Jordan,
| | | | | |
Collapse
|
38
|
Hashizume H. Adsorption of nucleic Acid bases, ribose, and phosphate by some clay minerals. Life (Basel) 2015; 5:637-50. [PMID: 25734235 PMCID: PMC4390872 DOI: 10.3390/life5010637] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 02/09/2015] [Accepted: 02/12/2015] [Indexed: 02/06/2023] Open
Abstract
Besides having a large capacity for taking up organic molecules, clay minerals can catalyze a variety of organic reactions. Derived from rock weathering, clay minerals would have been abundant in the early Earth. As such, they might be expected to play a role in chemical evolution. The interactions of clay minerals with biopolymers, including RNA, have been the subject of many investigations. The behavior of RNA components at clay mineral surfaces needs to be assessed if we are to appreciate how clays might catalyze the formation of nucleosides, nucleotides and polynucleotides in the "RNA world". The adsorption of purines, pyrimidines and nucleosides from aqueous solution to clay minerals is affected by suspension pH. With montmorillonite, adsorption is also influenced by the nature of the exchangeable cations. Here, we review the interactions of some clay minerals with RNA components.
Collapse
Affiliation(s)
- Hideo Hashizume
- National Institute for Materials Science, Tsukuba 305-0044, Japan.
| |
Collapse
|
39
|
Ghoneim MM, Abdel-Azzem MK, El-Desoky HS, Khattab AE. Electrochemical determination of pipazethate hydrochloride on Na-montmorillonite modified carbon paste electrode in formulation and human blood. J Solid State Electrochem 2014. [DOI: 10.1007/s10008-014-2674-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
40
|
Xu H, Qu X, Li H, Gu C, Zhu D. Sorption of tetracycline to varying-sized montmorillonite fractions. JOURNAL OF ENVIRONMENTAL QUALITY 2014; 43:2079-2085. [PMID: 25602224 DOI: 10.2134/jeq2014.04.0182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The influence of particle sizes on sorption of tetracycline by clay minerals is poorly understood. In this study, montmorillonite clay fractions with varying particle sizes were prepared by successive centrifugation, and the effects of particle sizes on sorption of tetracycline were evaluated using an equilibrium dialysis method. Sorption isotherms were nearly overlapped for size fractions ranging from 6.38 to 16.00 μm, except for the finest clay fraction (0.41 μm). The relatively low sorption by the fraction with the smallest particles could be attributed to the colloidal nature and high edge-to-surface ratio, which could lead to reduced accessibility of tetracycline to sorption sites (particularly those at the edges). The impact of solution pH and coexisting Na and Ca ions on tetracycline sorption was found to differ between the finest fraction and other clay fractions. The results demonstrated for the first time that clay particle size greatly influenced tetracycline sorption to clay minerals and consequently might affect their transport and bioavailability in the environment.
Collapse
|
41
|
Aspect ratio dependent cytotoxicity and antimicrobial properties of nanoclay. Appl Biochem Biotechnol 2014; 174:936-44. [PMID: 24894661 DOI: 10.1007/s12010-014-0983-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 05/19/2014] [Indexed: 01/22/2023]
Abstract
Nanoclays may enter human body through various routes such as through the respiratory and gastrointestinal tract, skin, blood, etc. There is dearth of such studies evaluating the interaction of clay nanoparticles with human cells. In particular, the interaction of proteins and nucleic acids with nanoparticles of different aspect ratio remains a domain that is very poorly probed and understood. In the present study, we address the issue of cytotoxicity and antimicrobial attributes of two distinct nanoclay platelets namely, laponite (diameter = 25 nm and thickness = 1 nm) and montmorillonite (MMT, diameter = 300 nm and thickness = 1 nm), having different aspect ratio (25:1 vs 300:1). Cytotoxicity was assessed in both prokatyotes: Escherichia coli, eukaryotes-human embryonic kidney (HEK), and cervical cancer SiHa cell lines, and a comparative size-based analysis of the toxicity were made at different exposure time points by MTT assay. The antimicrobial activity of the nanoclays was evaluated by disc diffusion method (Kirbey-Bauer protocol). Laponite exhibited maximum efficacy as an antimicrobial agent against E. coli. Comparatively smaller size laponite could preferentially enter the cells, leading to relatively wider or larger zone of inhibition. On contradictory; laponite showed 74.67 % survival while MMT showed 89.02 % survival in eukaryotic cells at 0.00001 % (w/v) concentration. In summary, both MMT and laponite indicated cytotoxicity at 0.05 % concentration within 24 h of exposure on HEK and cervical cancer (SiHa) cell lines. The toxicity was possibly dependent on size, aspect ratio, and concentration.
Collapse
|
42
|
Zeta Potential–Viscosity Relationship in Kaolinite Slurry in the Presence of Dispersants. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2014. [DOI: 10.1007/s13369-014-1146-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
43
|
Unal HI, Erol O, Gumus OY. Quaternized-poly(N-vinylimidazole)/montmorillonite nanocomposite: Synthesis, characterization and electrokinetic properties. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.04.054] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
44
|
Tsujimoto Y, Kobayashi M, Adachi Y. Viscosity of dilute Na-montmorillonite suspensions in electrostatically stable condition under low shear stress. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2012.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
45
|
Pecini EM, Avena MJ. Measuring the isoelectric point of the edges of clay mineral particles: the case of montmorillonite. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14926-14934. [PMID: 24228855 DOI: 10.1021/la403384g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The isoelectric point (IEP) of the edge surface of a montmorillonite sample was determined by using electrophoretic mobility measurements. This parameter, which is fundamental for the understanding of the charging behavior of clay mineral surfaces, was never measured so far because of the presence of permanent negative charges within the montmorillonite structure, charges that mask the electrokinetic behavior of the edges. The strategy was to block or neutralize the structural charges with two different cations, methylene blue (MB(+)) and tetraethylenepentaminecopper(II) ([Cu(tetren)](2+)), so that the charging behavior of the particles becomes that of the edge surfaces. Adsorption isotherms of MB(+) and [Cu(tetren)](2+) at different ionic strengths (NaCl) were performed to establish the uptakes that neutralize the cation exchange capacity (CEC, 0.96 meq g(-1)) of the sample. At high adsorptive concentrations, there was a superequivalent adsorption of MB(+) (adsorption exceeding the CEC) and an equivalent adsorption of [Cu(tetren)](2+) (adsorption reaching the CEC). In both cases, structural charges were neutralized at uptakes very close to the CEC. Zeta potential (ζ) vs pH data at different ionic strengths of montmorillonite with adsorbed MB(+) allowed to estimate an upper limit of the edge's IEP, 5.3 ± 0.2. The same kind of data obtained with adsorbed [Cu(tetren)](2+) provided a lower limit of the IEP, 4.0 ± 0.2. These values are in agreement with previously informed IEP and point of zero charge of pyrophyllite, which is structurally analogous to montmorillonite but carries no permanent charges. The importance of knowing the IEP of the edge surface of clay minerals is discussed. This value characterizes the intrinsic reactivity of edges, that is, the protonating capacity of edge groups in absence of any electric field generated by structural charges. It also allows us to correct relative edge charge vs pH curves obtained by potentiometric titrations and to obtain the true edge charge vs pH curves at different electrolyte concentrations.
Collapse
Affiliation(s)
- Eliana M Pecini
- Departamento de Química, Instituto de Química del Sur (INQUISUR-CONICET), Universidad Nacional del Sur , Bahía Blanca, Argentina
| | | |
Collapse
|
46
|
Li J, Song X, Pan J, Zhong L, Jiao S, Ma Q. Adsorption and flocculation of bentonite by chitosan with varying degree of deacetylation and molecular weight. Int J Biol Macromol 2013; 62:4-12. [DOI: 10.1016/j.ijbiomac.2013.08.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 08/11/2013] [Accepted: 08/16/2013] [Indexed: 10/26/2022]
|
47
|
Bouhamed H, Baklouti S, Bossis G. Interaction of PMANa+ with ZnO and Al2O3 nanopowders: Adsorption, stability and rheological behavior. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.04.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
48
|
Fernández M, Alba M, Torres Sánchez R. Effects of thermal and mechanical treatments on montmorillonite homoionized with mono- and polyvalent cations: Insight into the surface and structural changes. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.01.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
49
|
Borgnino L. Experimental determination of the colloidal stability of Fe(III)-montmorillonite: Effects of organic matter, ionic strength and pH conditions. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.01.065] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
50
|
The anisotropic characteristics of natural fibrous sepiolite as revealed by contact angle, surface free energy, AFM and molecular dynamics simulation. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.04.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|