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Szerlauth A, Varga Á, Madácsy T, Sebők D, Bashiri S, Skwarczynski M, Toth I, Maléth J, Szilagyi I. Confinement of Triple-Enzyme-Involved Antioxidant Cascade in Two-Dimensional Nanostructure. ACS MATERIALS LETTERS 2023; 5:565-573. [PMID: 36776691 PMCID: PMC9906813 DOI: 10.1021/acsmaterialslett.2c00580] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 01/12/2023] [Indexed: 06/18/2023]
Abstract
Application of antioxidant enzymes in medical or industrial processes is limited due to their high sensitivity to environmental conditions. Incorporation of such enzymes in nanostructures provides a promising route to obtain highly efficient and robust biocatalytic system to scavenge reactive oxygen species (ROS). Here, this question was addressed by confinement of superoxide dismutase (SOD), horseradish peroxidase (HRP), and catalase (CAT) enzymes into nanostructures containing polyelectrolyte building blocks (alginate (Alg) and trimethyl chitosan (TMC)) and delaminated layered double hydroxide (dLDH) nanoparticle support. The nanocomposite possessed excellent structural and colloidal stability, while antioxidant tests revealed that the enzymes remained active upon immobilization and the developed composite greatly reduced intracellular oxidative stress in two-dimensional cell cultures. Moreover, it effectively prevented hydrogen peroxide-induced double stranded DNA breaks, which is a common consequence of oxidative stress. The results provide important tools to design complex nanostructures with multienzymatic antioxidant activities for ROS scavenging.
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Affiliation(s)
- Adel Szerlauth
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Centre, University of Szeged, H-6720 Szeged, Hungary
| | - Árpád Varga
- MTA-SZTE
Lendület Epithelial Cell Signaling and Secretion Research Group,
Interdisciplinary Excellence Centre, University
of Szeged, H-6720 Szeged, Hungary
| | - Tamara Madácsy
- MTA-SZTE
Lendület Epithelial Cell Signaling and Secretion Research Group,
Interdisciplinary Excellence Centre, University
of Szeged, H-6720 Szeged, Hungary
| | - Dániel Sebők
- Department
of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Sahra Bashiri
- School
of Chemistry and Molecular Biosciences, University of Queensland, QLD-4072 St. Lucia, Australia
| | - Mariusz Skwarczynski
- School
of Chemistry and Molecular Biosciences, University of Queensland, QLD-4072 St. Lucia, Australia
| | - Istvan Toth
- School
of Chemistry and Molecular Biosciences, University of Queensland, QLD-4072 St. Lucia, Australia
| | - József Maléth
- MTA-SZTE
Lendület Epithelial Cell Signaling and Secretion Research Group,
Interdisciplinary Excellence Centre, University
of Szeged, H-6720 Szeged, Hungary
| | - Istvan Szilagyi
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Centre, University of Szeged, H-6720 Szeged, Hungary
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2
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Sáringer S, Valtner T, Varga Á, Maléth J, Szilágyi I. Development of polymer-based multifunctional composite particles of protease and peroxidase activities. J Mater Chem B 2021; 10:2523-2533. [PMID: 34757359 DOI: 10.1039/d1tb01861b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A hybrid material (SL-PPN-HEP-HRP) of dual enzyme function was prepared by co-immobilization of papain (PPN) and horseradish peroxidase (HRP) on sulphate latex (SL) microspheres using heparin (HEP) polyelectrolyte as a building block in the sequential adsorption method. The doses of PPN, HEP and HRP were optimized in each step of the preparation process to achieve high functional and colloidal stability. The enzymes and the polyelectrolyte strongly adsorbed on the oppositely charged surfaces via electrostatic forces, and enzyme leakage was not observed from the hybrid material, as confirmed by colorimetric protein tests and microscopy measurements. It was found that the polyelectrolyte acted as a separator between PPN and HRP to prevent hydrolytic attack on the latter enzyme, which otherwise prevents the joint use of these important biocatalysts. Excellent colloidal stability was obtained for the SL-PPN-HEP-HRP composite and the embedded PPN and HRP showed remarkable protease and peroxidase activities, respectively, at least until five days after preparation. The present results offer a promising approach to develop biocatalytic systems of dual function, which are often required in manufacturing processes in the food industry, where the colloidal stability of such multifunctional materials is a key parameter to achieve remarkable efficiency.
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Affiliation(s)
- Szilárd Sáringer
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Tamás Valtner
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Árpád Varga
- HAS-USZ Momentum Epithelial Cell Signaling and Secretion Research Group and HCEMM-SZTE Molecular Gastroenterology Research Group, Department of Medicine, University of Szeged, H-6720 Szeged, Hungary
| | - József Maléth
- HAS-USZ Momentum Epithelial Cell Signaling and Secretion Research Group and HCEMM-SZTE Molecular Gastroenterology Research Group, Department of Medicine, University of Szeged, H-6720 Szeged, Hungary
| | - István Szilágyi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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3
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Affiliation(s)
- Qiuhui Chang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jian Jiang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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4
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Co-immobilization of antioxidant enzymes on titania nanosheets for reduction of oxidative stress in colloid systems. J Colloid Interface Sci 2021; 590:28-37. [DOI: 10.1016/j.jcis.2021.01.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/04/2021] [Accepted: 01/05/2021] [Indexed: 02/07/2023]
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5
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Somosi Z, May NV, Sebők D, Pálinkó I, Szilágyi I. Catalytic antioxidant nanocomposites based on sequential adsorption of redox active metal complexes and polyelectrolytes on nanoclay particles. Dalton Trans 2021; 50:2426-2435. [PMID: 33527932 DOI: 10.1039/d0dt04186f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An antioxidant nanocomposite was prepared by successive adsorption of redox active metal complexes (copper(ii)-bipyridyl and iron(iii)-citrate) and polyelectrolytes (poly(styrene sulfonate) and poly(diallyldimethyl ammonium)) on layered double hydroxide nanoclay. The experimental conditions were optimized in each preparation step and thus, the final composite formed highly stable colloids, i.e., excellent resistance against salt-induced aggregation was achieved. Due to the synergistic effect of the metal complexes, the developed composite showed remarkable activity in the dismutation of superoxide radicals, close to the one determined for the native superoxide dismutase enzyme. The obtained composite is highly selective for superoxide radical dismutation, while its activity in other antioxidant tests was close to negligible. Structural characterization of the composite revealed that the excellent superoxide radical scavenging ability originated from the advantageous coordination geometry around the copper(ii) center formed upon immobilization. The structure formed around the metal centers led to optimal redox features and consequently, to an improved superoxide dismutase-like activity. The catalytic antioxidant composite is a promising candidate to reduce oxidative stress in industrial manufacturing processes, where natural enzymes quickly lose their activity due to the harsh environmental conditions.
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Affiliation(s)
- Zoltán Somosi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Research Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Nóra V May
- Centre for Structural Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary
| | - Dániel Sebők
- Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - István Szilágyi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Research Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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6
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Xu T, Liu J, Sun L, Zhang R, Xu ZP, Sun Q. Enhancing Tumor Accumulation and Cellular Uptake of Layered Double Hydroxide Nanoparticles by Coating/Detaching pH-Triggered Charge-Convertible Polymers. ACS OMEGA 2021; 6:3822-3830. [PMID: 33585761 PMCID: PMC7876861 DOI: 10.1021/acsomega.0c05520] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 01/12/2021] [Indexed: 05/03/2023]
Abstract
Layered double hydroxide (LDH) nanoparticles are extensively explored as multifunctional nanocarriers due to their versatility in both the host layer and the interlayer anion. In this study, we report modification of positively charged Cu-containing LDH nanoparticles with a pH-responsive charge-changeable polymer to improve the particle colloidal stability in blood circulation, reduce the nonspecific uptake by normal cells in organs, and subsequently facilitate tumor accumulation and uptake by tumor cells in the acidic tumor microenvironment. In vitro experimental results demonstrate that this promising charge-convertible polymer-LDH nanocarrier well reduces the capture by macrophages in the physiologic medium (pH 7.4) but facilitates the uptake by tumor cells due to detaching of the coated polymer layer in the weakly acidic condition (pH 6.8). Cu-containing LDH nanoparticles also show pH-responsive magnetic resonance imaging (MRI) contrast capacity (i.e., r 1 relaxivity). In vivo MRI further confirms effective tumor accumulation of the charge-convertible nanohybrids, with ∼4.8% of the injected dose accumulated at 24 h postintravenous injection, proving the potential as a versatile delivery nanocarrier to enhance the antitumor treatment.
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Affiliation(s)
- Tiefeng Xu
- Department
of Pathology, Shandong Provincial Qianfoshan Hospital, Cheeloo College
of Medicine, Shandong University, Jinan, Shandong Province 250014, People’s Republic
of China
- The
First Affiliated Hospital and The Oncological Institute of Hainan
Medical University, Haikou City, Hainan Province 570102, People’s Republic
of China
| | - Jianping Liu
- Australian
Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Luyao Sun
- Australian
Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Run Zhang
- Australian
Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Zhi Ping Xu
- Australian
Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Qing Sun
- Department
of Pathology, Shandong Provincial Qianfoshan Hospital, Cheeloo College
of Medicine, Shandong University, Jinan, Shandong Province 250014, People’s Republic
of China
- Department
of Pathology, The First Affiliated Hospital
of Shandong First Medical University & Shandong Provincial Qianfoshan
Hospital, Jinan, Shandong Province 250014, People’s Republic of China
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7
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Campbell J, Abnett J, Kastania G, Volodkin D, Vikulina AS. Which Biopolymers Are Better for the Fabrication of Multilayer Capsules? A Comparative Study Using Vaterite CaCO 3 as Templates. ACS APPLIED MATERIALS & INTERFACES 2021; 13:3259-3269. [PMID: 33410679 PMCID: PMC7880531 DOI: 10.1021/acsami.0c21194] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The polymer layer-by-layer assembly is accounted among the most attractive approaches for the design of advanced drug delivery platforms and biomimetic materials in 2D and 3D. The multilayer capsules can be made of synthetic or biologically relevant (e.g., natural) polymers. The biopolymers are advantageous for bioapplications; however, the design of such "biocapsules" is more challengeable due to intrinsic complexity and lability of biopolymers. Until now, there are no systematic studies that report the formation mechanism for multilayer biocapsules templated upon CaCO3 crystals. This work evaluates the structure-property relationship for 16 types of capsules made of different biopolymers and proposes the capsule formation mechanism. The capsules have been fabricated upon mesoporous cores of vaterite CaCO3, which served as a sacrificial template. Stable capsules of polycations poly-l-lysine or protamine and four different polyanions were successfully formed. However, capsules made using the polycation collagen and dextran amine underwent dissolution. Formation of the capsules has been correlated with the stability of the respective polyelectrolyte complexes at increased ionic strength. All formed capsules shrink upon core dissolution and the degree of shrinkage increased in the series of polyanions: heparin sulfate < dextran sulfate < chondroitin sulfate < hyaluronic acid. The same trend is observed for capsule adhesiveness to the glass surface, which correlates with the decrease in polymer charge density. The biopolymer length and charge density govern the capsule stability and internal structure; all formed biocapsules are of a matrix-type, other words are microgels. These findings can be translated to other biopolymers to predict biocapsule properties.
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Affiliation(s)
- Jack Campbell
- Department
of Chemistry and Forensics, School of Science and Technology, Nottingham Trent University, Clifton Lane, NG11 8NS Nottingham, U.K.
| | - Jordan Abnett
- Department
of Chemistry and Forensics, School of Science and Technology, Nottingham Trent University, Clifton Lane, NG11 8NS Nottingham, U.K.
| | - Georgia Kastania
- Department
of Chemistry and Forensics, School of Science and Technology, Nottingham Trent University, Clifton Lane, NG11 8NS Nottingham, U.K.
| | - Dmitry Volodkin
- Department
of Chemistry and Forensics, School of Science and Technology, Nottingham Trent University, Clifton Lane, NG11 8NS Nottingham, U.K.
- . Phone: +44-115-848-3140
| | - Anna S. Vikulina
- Branch
Bioanalytics and Bioprocesses, Fraunhofer
Institute for Cell Therapy and Immunology, Am Mühlenberg 13-Golm, 14476 Potsdam, Germany
- . Phone: +49-331 58187-122
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8
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Niu Y, Zhang W, Zhai C, Liu J. Effect of poly(diallyldimethylammonium chloride) adsorption on the dispersion features of SiC particles in aqueous media. NEW J CHEM 2021. [DOI: 10.1039/d1nj00062d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The dispersion behavior of SiC suspensions was improved by PDADMAC adsorbed on the SiC surface effectively through electrostatic interaction.
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Affiliation(s)
- Yifan Niu
- Beijing Key Laboratory of Electrochemical Process and Technology for materials
- Beijing University of Chemical Technology
- Beijing 100029
- People's Republic of China
| | - Wenxiao Zhang
- Beijing Key Laboratory of Electrochemical Process and Technology for materials
- Beijing University of Chemical Technology
- Beijing 100029
- People's Republic of China
| | - Chaoyang Zhai
- Beijing Key Laboratory of Electrochemical Process and Technology for materials
- Beijing University of Chemical Technology
- Beijing 100029
- People's Republic of China
| | - Jiaxiang Liu
- Beijing Key Laboratory of Electrochemical Process and Technology for materials
- Beijing University of Chemical Technology
- Beijing 100029
- People's Republic of China
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9
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Tiwari P, Bharti I, Bohidar HB, Quadir S, Joshi MC, Arfin N. Complex Coacervation and Overcharging during Interaction between Hydrophobic Zein and Hydrophilic Laponite in Aqueous Ethanol Solution. ACS OMEGA 2020; 5:33064-33074. [PMID: 33403268 PMCID: PMC7774070 DOI: 10.1021/acsomega.0c04647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
In this paper, for the first time, we have reported the formation of complex coacervate during interaction between hydrophobic protein, zein, and hydrophilic nanoclay, Laponite, in a 60% v/v ethanol solution at pH 4. Dynamic light scattering and viscosity measurements revealed the formation of zein-Laponite complexes during the interaction between zein at fixed concentration, C Z = 1 mg/mL, and varying concentrations of Laponite, C L (7.8 × 10-4 - 0.25% w/v). Further investigation of the zein-Laponite complexes using turbidity and zeta potential data showed that these complexes could be demarcated in three different regions: Region I, below the charge neutralization region (C Z = 1 mg/mL, C L ≤ 0.00625% w/v) where soluble complexes was formed during interaction between oppositely charged zein and Laponite; Region II, the charge neutralization region (C Z = 1 mg/mL, 0.00625 < C L ≤ 0.05% w/v) where zein-Laponite complexes form neutral coacervates; and Region III, the interesting overcharged coacervates region (C Z = 1 mg/mL, C L > 0.05% w/v). Investigation of coacervates using a fluorescence imaging technique showed that the size of neutral coacervates in region II was large (mean size = 1223.7 nm) owing to aggregation as compared to the small size of coacervates (mean size = 464.7 nm) in region III owing to repulsion between overcharged coacervates. Differential scanning calorimeter, DSC, revealed the presence of an ample amount of bound water in region III. The presence of bound water was evident from the presence of an additional peak at 107 °C in region III apart from normal enthalpy of evaporation of water from coacervates.
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Affiliation(s)
- Preeti Tiwari
- Soft
condense matter laboratory, Centre for Interdisciplinary Research
In Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Indu Bharti
- Soft
condense matter laboratory, Centre for Interdisciplinary Research
In Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Himadri B Bohidar
- School
of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Shabina Quadir
- Multidisciplinary
Centre for Advanced Research and Studies, Jamia Millia Islamia, New Delhi 110025, India
| | - Mohan C Joshi
- Multidisciplinary
Centre for Advanced Research and Studies, Jamia Millia Islamia, New Delhi 110025, India
| | - Najmul Arfin
- Soft
condense matter laboratory, Centre for Interdisciplinary Research
In Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India
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10
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Szerlauth A, Muráth S, Szilagyi I. Layered double hydroxide-based antioxidant dispersions with high colloidal and functional stability. SOFT MATTER 2020; 16:10518-10527. [PMID: 33073831 DOI: 10.1039/d0sm01531h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Highly stable antioxidant dispersions were designed on the basis of ring-opened ellagic acid (EA) intercalated into MgAl-layered double hydroxide (LDH) nanoparticles. The morphology of the composite was delicately modified with ethanolic washing to obtain EtOH-EA-LDH with a high specific surface area. The colloidal stability was optimized by surface functionalization with positively charged polyelectrolytes. Polyethyleneimine (PEI), protamine sulfate (PS) and poly(acrylamide-co-diallyl dimethyl ammonium chloride) (PAAm-co-DADMAC) was adsorbed onto the surface of the oppositely charged EtOH-EA-LDH leading to charge neutralization and overcharging at appropriate doses. Formation of adsorbed polyelectrolyte layers provided remarkable colloidal stability for the EtOH-EA-LDH. Modification with PEI and PAAm-co-DADMAC outstandingly improved the resistance of the particles against salt-induced aggregation with a critical coagulation concentration value above 1 M, while only limited stability was achieved by covering the nanoparticles with PS. The high antioxidant activity of EtOH-EA-LDH was greatly preserved upon polyelectrolyte coating, which was proved in the scavenging of radicals in the test reaction applied. Hence, an active antioxidant nanocomposite of high drug dose and remarkable colloidal stability was obtained to combat oxidative stress in systems of high electrolyte concentrations.
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Affiliation(s)
- Adél Szerlauth
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary.
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11
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Dryabina SS, Rudenko MS, Shulevich YV, Navrotskii AV, Novakov IA. Specifics of kaolin dispersion flocculation due to a polyelectrolyte complex formation on particle surface. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04623-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Shrestha S, Wang B, Dutta P. Nanoparticle processing: Understanding and controlling aggregation. Adv Colloid Interface Sci 2020; 279:102162. [PMID: 32334131 DOI: 10.1016/j.cis.2020.102162] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 04/13/2020] [Accepted: 04/14/2020] [Indexed: 12/22/2022]
Abstract
Nanoparticles (NPs) are commonly defined as particles with size <100 nm and are currently of considerable technological and academic interest, since they are often the starting materials for nanotechnology. Novel properties develop as a bulk material is reduced to nanodimensions and is reflected in new chemistry, physics and biology. With reduction in size, a greater function of the atoms is at the surface, and promote different interaction with its environment, as compared to the bulk material. In addition, the reduction in size alters the electronic structure of the material, resulting in novel quantum effects. Size also influences mobility, primarily controlled by Brownian motion for NPs, and relevant in biological and environmental processes. However, the small size also leads to high surface energy, and NPs tend to aggregate, thereby lowering the surface energy. In all applications, the uncontrolled aggregation of NPs can have negative effects and needs to be avoided. There are however examples of controlled aggregation of NPs which give rise to novel effects. This review article is focused on the NP features that influences aggregation. Common strategies for synthesis of NPs from the gas and liquid phases are discussed with emphasis on aggregation during and after synthesis. The theory involving Van der Waals attractive force and electrical repulsive force as the controlling features of the stability of NPs is discussed, followed by examples of how repulsive and attractive forces can be manipulated experimentally to control NP aggregation. In some applications, NPs prepared by liquid methods need to be isolated for further applications. The process of solvent removal introduces new forces such as capillary forces that promote aggregation, in many cases, irreversibly. Strategies for controlling aggregation upon drying are discussed. There are also many methods for redispersing aggregated NPs, which involve mechanical forces, as well as manipulating capillary forces and surface characteristics. We conclude this review with a discussion of aggregation relevant real-world applications of NPs. This review should be relevant for scientists and technologists interested in NPs, since emphasis has been on the practical aspects of NP-based technology, and especially, strategies relevant to controlling NP aggregation.
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Affiliation(s)
- Sweta Shrestha
- ZeoVation, 1275 Kinnear Road, Columbus, OH 43212, United States of America
| | - Bo Wang
- ZeoVation, 1275 Kinnear Road, Columbus, OH 43212, United States of America
| | - Prabir Dutta
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, United States of America.
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Szilagyi I. Layered Double Hydroxide-Based Nanomaterials-From Fundamentals to Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1174. [PMID: 31426373 PMCID: PMC6724089 DOI: 10.3390/nano9081174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/15/2019] [Accepted: 08/16/2019] [Indexed: 01/07/2023]
Abstract
Layered double hydroxides (LDHs) and their composites with various substances represent an important class of materials suitable for several existing and future applications in biological, chemical, and environmental processes [...].
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Affiliation(s)
- Istvan Szilagyi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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14
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Sáringer S, Rouster P, Szilágyi I. Regulation of the Stability of Titania Nanosheet Dispersions with Oppositely and Like-Charged Polyelectrolytes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4986-4994. [PMID: 30888825 DOI: 10.1021/acs.langmuir.9b00242] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Charging and aggregation processes of titania nanosheets (TNS) were extensively studied in the presence of oppositely charged or like-charged polyelectrolytes in aqueous dispersions. The surface charge of the TNS was systematically varied by the pH; therefore, positive nanosheets were obtained at pH 4 and negative ones at pH 10. Strong adsorption of poly(styrene sulfonate) (PSS) of high negative line charge density on the TNS was observed at pH 4, leading to charge neutralization and reversal of the original sign of charge of the nanosheets. The adsorption of like-charged poly(diallyldimethylammonium chloride) (PDADMAC) was also feasible through a hydrophobic interaction. The predominating interparticle forces were mainly of the DLVO-type, but additional patch-charge attraction also took place in the case of PSS at low surface coverage. The TNS was found to be hydrophilic at pH 10 and no adsorption of like-charged PSS was possible because of strong electrostatic repulsion between the polyelectrolyte and the surface. The PDADMAC showed high affinity to the oppositely charged TNS surface in alkaline dispersions, giving rise to neutral and positively charged nanosheets at appropriate polyelectrolyte doses. Formation of a saturated PDADMAC layer on the TNS led to high resistance against salt-induced aggregation through the electrosteric stabilization mechanism. These results shed light on the importance of polyelectrolyte concentration, ionic strength, and charge balance on the colloidal stability of TNS, which is especially important in applications, where the nanosheets are dispersed in complex solution containing polymeric compounds and electrolytes.
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Affiliation(s)
| | - Paul Rouster
- Institute of Condensed Matter and Nanosciences-Bio and Soft Matter , Université Catholique de Louvain , B-1348 Louvain-la-Neuve , Belgium
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