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Lo Dico G, Lisuzzo L, Carcelén V, Cavallaro G, Haranczyk M. Thermogravimetric Analysis of Moisture in Natural and Thermally Treated Clay Materials. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2231. [PMID: 38793298 PMCID: PMC11123035 DOI: 10.3390/ma17102231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 04/30/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024]
Abstract
Clays are a class of porous materials; their surfaces are naturally covered by moisture. Weak thermal treatment may be considered practical to remove the water molecules, changing the surface properties and making the micro- and/or mesoporosities accessible to interact with other molecules. Herein, a modulated thermogravimetric analysis (MTGA) study of the moisture behavior on the structures of five, both fibrous and laminar, clay minerals is reported. The effect of the thermal treatment at 150 °C, which provokes the release of weakly adsorbed water molecules, was also investigated. The activation energies for the removal of the adsorbed water (Ea) were calculated, and they were found to be higher, namely, from 160 to 190 kJ mol-1, for fibrous clay minerals compared to lamellar structures, ranging in this latter case from 80 to 100 kJ mol-1. The thermal treatment enhances the rehydration in Na-montmorillonite, stevensite, and sepiolite structures with a decrease in the energy required to remove it, while Ea increases significantly in palygorskite (from 164 to 273 kJ mol-1). As a proof of concept, the MTGA results are statistically correlated, together with a full characterization of the physico-chemical properties of the five clay minerals, with the adsorption of two molecules, i.e., aflatoxin B1 (AFB1) and β-carotene. Herein, the amount of adsorbed molecules ranges from 12 to 97% for the former and from 22 to 35% for the latter, depending on the particular clay. The Ea was correlated with AFB1 adsorption with a Spearman score of -0.9. When the adsorbed water is forcibly removed, e.g., under vacuum conditions and high temperatures, the structure becomes the most important, decreasing the Spearman score between β-carotene and Ea to -0.6.
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Affiliation(s)
- Giulia Lo Dico
- IMDEA Materials Institute, C/Eric Kandel 2, Getafe, 28906 Madrid, Spain;
- Tolsa Group, Carretera de Madrid a Rivas Jarama, 35, 28031 Madrid, Spain;
- Department of Materials Science and Engineering, Universidad Carlos III de Madrid, Avda. de la Unive sidad, 30, Leganés, 28911 Madrid, Spain
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy;
| | - Lorenzo Lisuzzo
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy;
| | - Verónica Carcelén
- Tolsa Group, Carretera de Madrid a Rivas Jarama, 35, 28031 Madrid, Spain;
- Department of Materials Science and Engineering, Universidad Carlos III de Madrid, Avda. de la Unive sidad, 30, Leganés, 28911 Madrid, Spain
| | - Giuseppe Cavallaro
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy;
| | - Maciej Haranczyk
- IMDEA Materials Institute, C/Eric Kandel 2, Getafe, 28906 Madrid, Spain;
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Nhan J, Strebel N, Virah Sawmy K, Yin J, St-Pierre JP. Characterization of Calcium- and Strontium-Polyphosphate Particles Toward Drug Delivery into Articular Cartilage. Macromol Biosci 2024; 24:e2300345. [PMID: 37777870 DOI: 10.1002/mabi.202300345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/21/2023] [Indexed: 10/02/2023]
Abstract
Drug delivery into articular cartilage poses many challenges due in part to its lack of vasculature. While intra-articular injections are effective for the local administration of drugs, small molecules are rapidly cleared from the synovial fluid. As such, there is a need to develop effective drug delivery strategies to improve the residence times of bioactive molecules in the joint and elicit a sustained therapeutic effect. In this study, calcium- and strontium-polyphosphate particles are synthesized and characterized as potential drug carriers into articular cartilage. Physicochemical characterization reveals that the particles exhibit a spherical morphology, have a negative zeta potential, and are nanoscale in size. Biological characterization in chondrocytes confirms cellular uptake of the particles and demonstrates both size and concentration-dependent cytotoxicity at high concentrations. Furthermore, treatment of chondrocytes with these particles results in a reduction in cell proliferation and metabolic activity, confirming biological effects. Finally, incubation with cartilage tissue explants suggests successful uptake, despite the particles exhibiting a negative surface charge. Therefore, from the results of this study, these polyphosphate-based particles have potential as a drug carrier into articular cartilage and warrant further development.
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Affiliation(s)
- Jordan Nhan
- Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada
| | - Nicolas Strebel
- Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada
| | - Khushnouma Virah Sawmy
- Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada
| | - Jordan Yin
- Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada
| | - Jean-Philippe St-Pierre
- Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada
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Nwambaekwe KC, Ramoroka ME, Yussuf ST, Morudu TC, Ndipingwi MM, Iwuoha EI. Tb- and Eu-doped yttrium oxyselenides as novel absorber layers for superstrate thin-film photovoltaics: improved spectral optical absorption and green-red phosphor activation. NANOSCALE 2023; 15:17147-17172. [PMID: 37853791 DOI: 10.1039/d3nr01162c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
To generate and deliver alternative sustainable energy in the face of the current energy crisis, new materials that can capture solar energy and transform it into other useful energies are required. Rare-earth (RE) oxychalcogenides are now being used more frequently as up/down-conversion materials in established photovoltaic (PV) devices to boost their PV performance. Here, through an efficient microwave assisted synthesis procedure, novel nanoplate/sheet shaped nanomaterials of yttrium oxyselenide (YOSe) and its analogues doped with Tb and Eu (YOSe:Tb and YOSe:Eu) were successfully synthesized. Analyses of the structure, stability, morphology, light absorption, and electrochemistry were performed. This work showed that the parent YOSe exhibited green (543 nm) and red (615 nm) emission luminescence when doped with Tb and Eu with a luminescence quantum yield (LQY) of 0.56 and 0.53 for YOSe:Tb and YOSe:Eu nanomaterials, respectively. The surface and material conductivity of YOSe improved with the addition of the dopant elements, with the best outcome shown in YOSe:Eu, according to electrokinetic research evidenced by the enhanced current peaks, reduced charge-transfer resistance (Rct) and low impedance magnitude (Zmag) through electrochemical experiments. These improvements were induced by the distinctive properties of the dopant elements. PCEs of 0.25%, 0.67%, and 1.20% were obtained for YOSe, YOSe:Tb, and YOSe:Eu-based PV devices, respectively, using the nanomaterials as novel absorber layers in a superstrate device design. Our results can initiate further exploitation of the doped host structure for effective down-conversion NIR luminescence for applications in PV devices and to boost the PV performance of existing solar cells.
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Affiliation(s)
- Kelechi C Nwambaekwe
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Morongwa E Ramoroka
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Sodiq T Yussuf
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Tshaamano C Morudu
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Miranda M Ndipingwi
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Emmanuel I Iwuoha
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
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Guo C, Shen W, Jin W, Jia X, Ji Z, Li J, Li B. Aggregation kinetics of green tea nanoparticles: Effects of pH, metal ions, and temperature. J Food Sci 2023; 88:4068-4078. [PMID: 37623917 DOI: 10.1111/1750-3841.16750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 08/04/2023] [Accepted: 08/10/2023] [Indexed: 08/26/2023]
Abstract
Colloidal nanoparticles in tea infusion are the link connecting micromolecular mechanism and macro-aggregation process of tea cream formation. In order to elucidate, the kinetics mechanism of green tea nanoparticles (gTNPs) aggregation, zeta-potentials, total average aggregation (TAA) rates, and critical coagulation concentration (CCC) in the presence of various pH and metal ions were investigated. Additionally, the effect of temperature on gTNPs aggregation was further explored. The results revealed that the TAA rate of gTNPs increased with decreasing pH values, the CCC of gTNPs increased in the order Mg2+ ≈ Ca2+ < Na+ ≈ K+ . The reason was that different positive ions changed the surface electric field strength of gTNPs to a different extent. Furthermore, it was indicated that low temperature could promote gTNPs aggregation in indirect way. Low temperature promoted the binding of epigallocatechin gallate (EGCG) and caffeine, and the combination between gTNPs and EGCG-caffeine complexes weakened the stability of gTNPs resulting from reduction in electrostatic repulsion. PRACTICAL APPLICATION: Tea is a popular beverage all over the world. This research revealed the mechanism of green tea nanoparticles aggregation and laid a theoretical foundation for the regulation of tea cream formation in tea beverage.
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Affiliation(s)
- Cheng Guo
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, China
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education, Wuhan, China
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan, China
| | - Wangyang Shen
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, China
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education, Wuhan, China
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan, China
| | - Weiping Jin
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, China
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education, Wuhan, China
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan, China
| | - Xiwu Jia
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, China
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education, Wuhan, China
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan, China
| | - Zhili Ji
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, China
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education, Wuhan, China
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan, China
| | - Jinling Li
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, China
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education, Wuhan, China
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan, China
| | - Bin Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, Wuhan, China
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Gao P, Liu X, Guo Z, Tournassat C. Acid-Base Properties of Cis-Vacant Montmorillonite Edge Surfaces: A Combined First-Principles Molecular Dynamics and Surface Complexation Modeling Approach. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:1342-1352. [PMID: 36627109 PMCID: PMC9878716 DOI: 10.1021/acs.est.2c07171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 12/16/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Montmorillonite layer edge surfaces have pH-dependent properties, which arises from the acid-base reactivity of their surface functional groups. Edge surface acidity (with intrinsic reaction equilibrium constant, pKa) is a chemical property that is affected by crystal structure. While a cis-vacant structure predominates in natural montmorillonites, prior molecular-level studies assume a centrosymmetric trans-vacant configuration, which potentially leads to an incorrect prediction of montmorillonite acid-base surface properties. We computed intrinsic acidity constants of the surface sites of a montmorillonite layer with a cis-vacant structure using the first-principles molecular dynamics-based vertical energy gap method. We evaluated pKa values for both non-substituted and Mg-substituted layers on common edge surfaces (i.e., surfaces perpendicular to [010], [01̅0], [110], and [1̅1̅0] crystallographic directions). The functional groups ≡Si(OH), ≡Al(OH2)2/≡Al(OH)(OH2), and ≡SiO(OH)Al sites on surfaces perpendicular to [010] and [01̅0] and ≡Si(OH)U, ≡Si(OH)L, ≡Al(OH2), and ≡Al(OH2)2 on surfaces perpendicular to [110] and [1̅1̅0] determine the proton reactivity of non-substituted cis-vacant edge surfaces. Moreover, the structural OH sites on edge surfaces had extremely high pKa values, which do not show reactivity at a common pH. Meanwhile, Mg2+ substitution results in an increase in pKa values at local or adjacent sites, in which the effect is limited by the distance between the sites. A surface complexation model was built with predicted pKa values, which enabled us to predict surface properties as a function of pH and ionic strength. Edge surface charge of both trans- and cis-vacant models has little dependence on Mg2+ substitutions, but the dependence on the crystal plane orientation is strong. In particular, at pH below 7, edge surfaces are positively or negatively charged depending on their orientation. Implications of these findings on contaminant adsorption by smectites are discussed.
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Affiliation(s)
- Pengyuan Gao
- Radiochemistry
Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Frontiers
Science Center for Rare Isotopes, Lanzhou
University, Lanzhou 730000, China
- Institut
des Sciences de la Terre d’Orléans, Université
d’Orléans-CNRS-BRGM, Orléans 45071, France
| | - Xiandong Liu
- State
Key Laboratory for Mineral Deposits Research, School of Earth Sciences
and Engineering, Nanjing University, Nanjing 210093, China
- Frontiers
Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, China
| | - Zhijun Guo
- Radiochemistry
Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Frontiers
Science Center for Rare Isotopes, Lanzhou
University, Lanzhou 730000, China
| | - Christophe Tournassat
- Institut
des Sciences de la Terre d’Orléans, Université
d’Orléans-CNRS-BRGM, Orléans 45071, France
- Earth and
Environmental Sciences Area, Lawrence Berkeley
National Laboratory, Berkeley, California 94720, United States
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Sobolev VD, Sergeeva IP, Vasileva ER. Electrokinetic Measurements in Highly Concentrated Solutions of Alkali Metal Chlorides. COLLOID JOURNAL 2022. [DOI: 10.1134/s1061933x22700144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Ribeiro A, Kroetz BL, Tarley CRT, Abrao T, Parreira PS, Santos MJ. Separating selenium species by diffusion in Brazilian bentonite: a mathematical modeling approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:88119-88130. [PMID: 35829885 DOI: 10.1007/s11356-022-21529-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 06/10/2022] [Indexed: 06/15/2023]
Abstract
Bentonite was applied in diffusive studies for selenium, an emerging contaminant. The planar source method was used to determine the apparent and effective diffusion coefficients and assess the mobility of the selenium species. A double Gaussian function described the results. Different diffusion coefficients were associated with different mobilities, and consequently, to the coexistence of two selenium species: selenite and selenate. Apparent diffusion coefficients were higher for selenate, around 10- 10 m2 s- 1, than for selenite, around 10- 12 m2 s- 1. Results from sequential extraction and distribution coefficient justified selenate's greater mobility than selenite. Since the increase in redox potential from 448 to 511 mV may be associated with selenite oxidation in an interconversion process, the diffusion in bentonite demonstrates that applications in geological barriers deserve attention regarding the mobilization of selenium species. Interconversions can mobilize selenium, as reduced species can shift to more oxidized and mobile species, enhancing environmental contamination.
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Affiliation(s)
- Angelita Ribeiro
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Barbara L Kroetz
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Cesar R T Tarley
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Taufik Abrao
- Electrical Engineering Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Paulo S Parreira
- Physics Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Maria Josefa Santos
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990.
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Electrostatic effects on ligand-assisted transfer of metals to (bio)accumulating interfaces and metal complexes (bioavai)lability. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Leroy P, Maineult A, Li S, Vinogradov J. The zeta potential of quartz. Surface complexation modelling to elucidate high salinity measurements. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Mons PJ, Fribiczer N, Kowalczuk K, Poudel P, Seiffert S, Schacher FH. Double hydrophilic poly(ethylene glycol)- block-poly(dehydroalanine) four-arm star block copolymers: synthesis and solution behavior. Polym Chem 2022. [DOI: 10.1039/d2py00579d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis and solution behavior of double hydrophilic star-shaped block copolymers featuring an ampholytic polydehydroalanine segment.
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Affiliation(s)
- Peter J. Mons
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Lessingstraße 8, D-07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
- Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
| | - Nora Fribiczer
- Department of Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10–14, D-55128 Mainz, Germany
| | - Kathrin Kowalczuk
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Lessingstraße 8, D-07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
- Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
| | - Purushottam Poudel
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Lessingstraße 8, D-07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
- Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
| | - Sebastian Seiffert
- Department of Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10–14, D-55128 Mainz, Germany
| | - Felix H. Schacher
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Lessingstraße 8, D-07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
- Center for Energy and Environmental Chemistry (CEEC), Friedrich-Schiller-University Jena, Philosophenweg 7, D-07743 Jena, Germany
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Bujok S, Konefał M, Konefał R, Nevoralová M, Bednarz S, Mielczarek K, Beneš H. Insight into the aqueous Laponite® nanodispersions for self-assembled poly(itaconic acid) nanocomposite hydrogels: The effect of multivalent phosphate dispersants. J Colloid Interface Sci 2021; 610:1-12. [PMID: 34922067 DOI: 10.1016/j.jcis.2021.12.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/31/2021] [Accepted: 12/08/2021] [Indexed: 10/19/2022]
Abstract
HYPOTHESIS We hypothesize, that physical network between Laponite® nanoparticles and high molecular weight polyelectrolyte formed by mixing of Laponite® nanodispersion (containing multivalent phosphate dispersant) and polyelectrolyte solution is strongly influenced by the type and content of dispersant, which forms electric double layer (EDL) closely to the Laponite® edges. Thus, optimum dispersant concentration is necessary to overcome clay-clay interactions (excellent clay delamination), but should not be exceeded, what would result in the EDL compression and weakening of attractions forming clay-polyelectrolyte network. Thus, deeper investigation of Laponite® nanodispersions is highly demanded since it would enable to better design the self-assembled clay-polyelectrolyte hydrogels. EXPERIMENTS To study clay interparticle interactions in the presence of various multivalent phosphates, complementary methods providing wide nanodispersion characterization have been applied: zeta potential measurement and SAXS technique (electrostatic interactions), oscillatory rheology (nanodispersion physical state) and NMR experiments (ion immobilization degree). FINDINGS It was found that multivalent phosphates induce and tune strength of clay-polyelectrolyte interactions forming hydrogel network in terms of varying EDL on the Laponite® edges. Moreover, phosphate dispersing efficiency depends on the molecular size, chemical structure, and valence of the anion; its potential as efficient dispersant for hydrogel preparation can be evaluated by estimation of anion charge density.
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Affiliation(s)
- Sonia Bujok
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic.
| | - Magdalena Konefał
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
| | - Rafał Konefał
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
| | - Martina Nevoralová
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
| | - Szczepan Bednarz
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, Cracow 31-155, Poland
| | - Kacper Mielczarek
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, Cracow 31-155, Poland
| | - Hynek Beneš
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
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12
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Pochapski DJ, Carvalho Dos Santos C, Leite GW, Pulcinelli SH, Santilli CV. Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13379-13389. [PMID: 34637312 DOI: 10.1021/acs.langmuir.1c02056] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this work, a set of experimental electrophoretic mobility (μe) data was used to show how inappropriate selection of the electrokinetic model used to calculate the zeta potential (ζ-potential) can compromise the interpretation of the results for nanoparticles (NPs). The main consequences of using ζ-potential values as criteria to indicate the colloidal stability of NP dispersions are discussed based on DLVO interaction energy predictions. For this, magnetite (Fe3O4) NPs were synthesized and characterized as a model system for performing electrokinetic experiments. The results showed that the Fe3O4 NPs formed mass fractal aggregates in solution, so the ζ-potential could not be determined under ideal conditions when μe depends on the NP radius. In addition, the Dukhin number (Du) estimated from potentiometric titration results indicated that stagnant layer conduction (SLC) could not be neglected for this system. The electrokinetic models that do not consider SLC grossly underestimated the ζ-potential values for the Fe3O4 NPs. The DLVO interaction energy predictions for the colloidal stability of the Fe3O4 NP dispersions also depended on the electrokinetic model used to calculate the ζ-potential. The results obtained for the Fe3O4 NP dispersions also suggested that, contrary to many reports in the literature, high ζ-potential values do not necessarily reflect high colloidal stability for charge-stabilized NP dispersions.
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Affiliation(s)
- Daniel José Pochapski
- Institute of Chemistry, São Paulo State University (UNESP), Araraquara, SP 14800-060, Brazil
| | | | - Gabriel Wosiak Leite
- Institute of Chemistry, São Paulo State University (UNESP), Araraquara, SP 14800-060, Brazil
- Chemistry Department, Federal University of São Carlos (UFSCar), São Carlos, SP 13565-905, Brazil
| | | | - Celso Valentim Santilli
- Institute of Chemistry, São Paulo State University (UNESP), Araraquara, SP 14800-060, Brazil
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13
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Adsorptive capacity of spray-dried pH-treated bentonite and kaolin powders for ammonium removal. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.02.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Schwartz N, Levy L, Carmeli B, Radian A. Spectral induced polarization of clay-oxide hybrid particles. J Colloid Interface Sci 2020; 577:173-180. [PMID: 32473476 DOI: 10.1016/j.jcis.2020.05.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 05/08/2020] [Accepted: 05/10/2020] [Indexed: 02/03/2023]
Abstract
The properties of clays and oxides govern many environmental processes, consequently, ongoing effort is invested in developing non-destructive, in-situ analytical tools that reflect these properties. Herein, the physicochemical properties of montmorillonite (MMT) and iron-oxide coated montmorillonite (FeOx-MMT) were characterized using common analytical techniques, and the results were compared to spectral induced polarization (SIP) measurements. FeOx-MMT particles showed a lower CEC, higher pH dependency of the surface charge, and lower suspension stability. Also, the size of the primary particles increased following iron-oxide deposition. SIP measurements over a range of salinities showed that the effective polarization length of the clays was in the order of several microns, suggesting the measurements of aggregates (not primary particles). Moreover, FeOx-MMT particles were more compact than MMT, and their size decreased with increasing salinity due to compaction of the EDL and arrangement of primary particles in the aggregate. The SIP-response to pH changes agreed with zeta potential measurements; at low pH values, MMT exhibited higher polarization due to the higher CEC. However, at a high pH, the differences diminish due to deprotonation of the Fe-OH surface groups. These findings suggest that SIP is a sensitive method that can detect changes in the surface chemistry of soil particles.
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Affiliation(s)
- Nimrod Schwartz
- Faculty of Agriculture, Food and Environment, Hebrew University, Jerusalem, Israel
| | - Lior Levy
- Civil and Environmental Engineering Faculty, Technion, Haifa, Israel
| | - Ben Carmeli
- Faculty of Agriculture, Food and Environment, Hebrew University, Jerusalem, Israel
| | - Adi Radian
- Civil and Environmental Engineering Faculty, Technion, Haifa, Israel.
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15
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Coupled influences of particle shape, surface property and flow hydrodynamics on rod-shaped colloid transport in porous media. J Colloid Interface Sci 2020; 577:471-480. [DOI: 10.1016/j.jcis.2020.05.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 11/17/2022]
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16
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Yustres Á, López-Vizcaíno R, Cabrera V, Rodrigo MA, Navarro V. Donnan-ion hydration model to estimate the electroosmotic permeability of clays. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136758] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Nirwan JS, Farhaj S, Chaudhary MM, Khizer Z, Hasan SS, Angelis-Dimakis A, Gill A, Rasheed H, Abbas N, Arshad MS, Hussain T, Shahzad Y, Yousaf AM, Chohan TA, Hussain T, Merchant HA, Akram MR, Khan TM, Ashraf M, Conway BR, Ghori MU. Exploration of a New Source of Sustainable Nanomaterial from the Koh-e-Suleiman Mountain Range of Pakistan for Industrial Applications. Sci Rep 2020; 10:577. [PMID: 31953500 PMCID: PMC6969096 DOI: 10.1038/s41598-020-57511-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 12/27/2019] [Indexed: 11/29/2022] Open
Abstract
The present study aimed to explore a new source of montmorillonite and to develop an extraction and purification protocol for its isolation from raw clay samples acquired from the Koh-e-Suleiman mountain range in Pakistan. The process involved the collection of raw clay from the source, identification and quantification of montmorillonite. Granulometric extraction and purification protocols increased the montmorillonite content from 21.8-25.1% in the raw clay to 90.1-93.9% after small-scale extraction and 85.33-89.33% on a larger scale. A techno-economic analysis highlighted the practicality and economic benefits of large-scale extraction for industrial applications. This study highlights the existence of a substantial new source of this valuable clay which is currently used across multiple industries including construction, pottery making, pharmaceuticals, cosmetics and engineering. It is intuitively expected that the large-scale extraction of the material will improve the economic condition of the region by providing employment opportunities to locals and may be a valuable resource for export.
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Affiliation(s)
- J S Nirwan
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - S Farhaj
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | | | - Z Khizer
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - S S Hasan
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - A Angelis-Dimakis
- Department of Chemical Sciences, University of Huddersfield, Huddersfield, UK
| | - A Gill
- Ministry of Minerals and Mines, Lahore, Punjab, Pakistan
| | - H Rasheed
- Pakistan Council of research for Water Resources (PCRWR), Ministry of Science and Technology, Islamabad, Pakistan
| | - N Abbas
- University College of Pharmacy, the University of Punjab, Lahore, Pakistan
| | - M S Arshad
- Faculty of Pharmacy, Bahuddin Zakariya University Multan, Multan, Pakistan
| | - T Hussain
- Department of Pharmacy, COMSAT University Islamabad, Lahore Campus, Lahore, Pakistan
| | - Y Shahzad
- Department of Pharmacy, COMSAT University Islamabad, Lahore Campus, Lahore, Pakistan
| | - A M Yousaf
- Department of Pharmacy, COMSAT University Islamabad, Lahore Campus, Lahore, Pakistan
| | - T A Chohan
- Institute of Pharmaceutical Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - T Hussain
- The Wolfson Centre for Bulk Solid Handling Technology, University of Greenwich, London, UK
- System Engineering Department, Military Technological College, Muscat, Oman
| | - H A Merchant
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - M R Akram
- College of Pharmacy, University of Sargodha, Sargodha, 40100, Pakistan
| | - T M Khan
- Institute of Pharmaceutical Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - M Ashraf
- Pakistan Council of research for Water Resources (PCRWR), Ministry of Science and Technology, Islamabad, Pakistan
| | - B R Conway
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - M U Ghori
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK.
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18
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Sobolev VD, Sergeeva IP, Sabbatovskii KG. Electrokinetic Measurements at High Concentrations of Electrolytes with Multicharged Cations. COLLOID JOURNAL 2020. [DOI: 10.1134/s1061933x1906019x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Effects of sort and concentration of salts on the electrosurface properties of aqueous suspensions containing hydrophobic and hydrophilic particles: Validity of the Hofmeister series. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Dening TJ, Joyce P, Webber JL, Beattie DA, Prestidge CA. Inorganic surface chemistry and nanostructure controls lipolytic product speciation and partitioning during the digestion of inorganic-lipid hybrid particles. J Colloid Interface Sci 2018; 532:666-679. [DOI: 10.1016/j.jcis.2018.08.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 08/05/2018] [Accepted: 08/06/2018] [Indexed: 01/27/2023]
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21
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Sergeeva IP, Sobolev VD. Electrokinetic Measurements at High Electrolyte Concentrations. COLLOID JOURNAL 2018. [DOI: 10.1134/s1061933x18050162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Moslemizadeh A, Khezerloo-ye Aghdam S, Shahbazi K, Zendehboudi S. A triterpenoid saponin as an environmental friendly and biodegradable clay swelling inhibitor. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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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]
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24
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Montmorillonite-lipid hybrid carriers for ionizable and neutral poorly water-soluble drugs: Formulation, characterization and in vitro lipolysis studies. Int J Pharm 2017; 526:95-105. [PMID: 28456653 DOI: 10.1016/j.ijpharm.2017.04.063] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 04/23/2017] [Accepted: 04/25/2017] [Indexed: 11/21/2022]
Abstract
Lipid-based formulations (LBFs) are a popular strategy for enhancing the gastrointestinal solubilization and absorption of poorly water-soluble drugs. In light of this, montmorillonite-lipid hybrid (MLH) particles, composed of medium-chain triglycerides, lecithin and montmorillonite clay platelets, have been developed as a novel solid-state LBF. Owing to the unique charge properties of montmorillonite, whereby the clay platelet surfaces carry a permanent negative charge and the platelet edges carry a pH-dependent charge, three model poorly water-soluble drugs with different charge properties; blonanserin (weak base, pKa 7.7), ibuprofen (weak acid, pKa 4.5) and fenofibrate (neutral), were formulated as MLH particles and their performance during biorelevant in vitro lipolysis at pH 7.5 was investigated. For blonanserin, drug solubilization during in vitro lipolysis was significantly reduced 3.4-fold and 3.2-fold for MLH particles in comparison to a control lipid solution and silica-lipid hybrid (SLH) particles, respectively. It was hypothesized that strong electrostatic interactions between the anionic montmorillonite platelet surfaces and cationic blonanserin molecules were responsible for the inferior performance of MLH particles. In contrast, no significant influence on drug solubilization was observed for ibuprofen- and fenofibrate-loaded MLH particles. The results of the current study indicate that whilst MLH particles are a promising novel formulation strategy for poorly water-soluble drugs, drug ionization tendency and the potential for drug-clay interactions must be taken into consideration to ensure an appropriate performance.
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25
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Liu X, Bai M. Effect of chemical composition on the surface charge property and flotation behavior of pyrophyllite particles. ADV POWDER TECHNOL 2017. [DOI: 10.1016/j.apt.2016.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Moslemizadeh A, Shirmardi Dezaki A, Shadizadeh SR. Mechanistic understanding of chemical flooding in swelling porous media using a bio-based nonionic surfactant. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Yang F, Wu W, Chen S, Gan W. The ionic strength dependent zeta potential at the surface of hexadecane droplets in water and the corresponding interfacial adsorption of surfactants. SOFT MATTER 2017; 13:638-646. [PMID: 27991633 DOI: 10.1039/c6sm02174c] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An anomalous maximum in the ionic strength dependent electrophoretic mobility curves has been observed in previous reports from particles dispersed in colloids. This maximum has been considered anomalous because it is contradictory with the Gouy-Chapman model. The existence of such a maximum has been attributed to specific ionic adsorption, a hairy layer at the surface, or the effect of the anomalous change of surface conductivity in different studies. It was also pointed out that the O'Brien-White approach based on the Gouy-Chapman model could be used to understand this maximum in electrophoretic mobility curves and lead to understandable zeta potential curves. This implied that the observed maximum was actually not "anomalous". In this work we report our simulation of ionic strength dependent zeta potential curves based on the O'Brien-White approach and experimental studies of the ionic strength dependent electrophoretic mobility of the hexadecane droplets in the hexadecane-water emulsions at different pH or in the presence of sodium dodecyl sulphate at varied concentrations. In some cases, the simulation shows that the calculation with the O'Brien-White approach does change the trend in the concerned ionic strength dependent curves. However, the simulation in some other cases also leads to similar trends in the ionic strength dependent electrophoretic mobility curves and zeta potential curves. In the experiments, both the existence and non-existence of such a maximum were observed and demonstrated to be system dependent. The corresponding molecular structure of the oil-water interface was then discussed with the analyses of the zeta potential curves and second harmonic generation signals recorded at the hexadecane-water interface.
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Affiliation(s)
- Fangyuan Yang
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Wu
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shunli Chen
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China.
| | - Wei Gan
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China. and Department of Natural Science and Humanities, Shenzhen Graduate School, Harbin Institute of Technology, University Town, Shenzhen 518055, China
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28
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Billing M, Festag G, Bellstedt P, Schacher FH. Amphiphilic and double hydrophilic block copolymers containing a polydehydroalanine block. Polym Chem 2017. [DOI: 10.1039/c6py02076c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We present the synthesis and characterization of amphiphilic and double hydrophilic block copolymers containing a polydehydroalanine (PDha) block.
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Affiliation(s)
- Mark Billing
- Laboratory of Organic Chemistry and Macromolecular Chemistry
- Friedrich-Schiller-University Jena
- D-07743 Jena
- Germany
- Jena Center for Soft Matter (JCSM)
| | - Grit Festag
- Laboratory of Organic Chemistry and Macromolecular Chemistry
- Friedrich-Schiller-University Jena
- D-07743 Jena
- Germany
- Jena Center for Soft Matter (JCSM)
| | - Peter Bellstedt
- Laboratory of Organic Chemistry and Macromolecular Chemistry
- Friedrich-Schiller-University Jena
- D-07743 Jena
- Germany
| | - Felix H. Schacher
- Laboratory of Organic Chemistry and Macromolecular Chemistry
- Friedrich-Schiller-University Jena
- D-07743 Jena
- Germany
- Jena Center for Soft Matter (JCSM)
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29
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Dening TJ, Joyce P, Rao S, Thomas N, Prestidge CA. Nanostructured Montmorillonite Clay for Controlling the Lipase-Mediated Digestion of Medium Chain Triglycerides. ACS APPLIED MATERIALS & INTERFACES 2016; 8:32732-32742. [PMID: 27934188 DOI: 10.1021/acsami.6b13599] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Biocompatible lipid hybrid particles composed of montmorillonite and medium chain triglycerides were engineered for the first time by spray drying oil-in-water emulsions stabilized by montmorillonite platelets to form montmorillonite-lipid hybrid (MLH) microparticles containing up to 75% w/w lipid. In vitro lipolysis studies under simulated intestinal conditions indicated that the specific porous nanoarchitecture and surface chemistry of MLH particles significantly increased the rate (>10-fold) and extent of lipase-mediated digestion compared to that of coarse and homogenized submicrometer triglyceride emulsions. Proton nuclear magnetic resonance studies verified the rapid and enhanced production of fatty acids for MLH particles; these are electrostatically repelled by the negatively charged montmorillonite platelet faces and avoid the "interfacial poisoning" caused by incomplete digestion that retards lipid droplet digestion. MLH particles are a novel biomaterial and encapsulation system that optimize lipase enzyme efficiency and have excellent potential as a smart delivery system for lipophilic biomolecules owing to their exceptional physicochemical and biologically active properties. These particles can be readily fabricated with varying lipid loads and thus may be tailored to optimize the solubilization of specific bioactive molecules requiring reformulation.
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Affiliation(s)
- Tahnee J Dening
- School of Pharmacy and Medical Sciences, University of South Australia , City East Campus, Adelaide, South Australia 5001, Australia
| | - Paul Joyce
- Future Industries Institute, University of South Australia , Mawson Lakes Campus, Mawson Lakes, South Australia 5095, Australia
| | - Shasha Rao
- School of Pharmacy and Medical Sciences, University of South Australia , City East Campus, Adelaide, South Australia 5001, Australia
| | - Nicky Thomas
- School of Pharmacy and Medical Sciences, University of South Australia , City East Campus, Adelaide, South Australia 5001, Australia
| | - Clive A Prestidge
- School of Pharmacy and Medical Sciences, University of South Australia , City East Campus, Adelaide, South Australia 5001, Australia
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30
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Influence of surface conductivity on the apparent zeta potential of calcite. J Colloid Interface Sci 2016; 468:262-275. [DOI: 10.1016/j.jcis.2016.01.075] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 01/27/2016] [Accepted: 01/28/2016] [Indexed: 11/19/2022]
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