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Park SJ, Park I, Kim S, Kim MK, Kim S, Jeong H, Kim D, Cho SW, Park TE, Ni A, Lim H, Joo J, Lee JH, Kang JH. Extracorporeal Blood Treatment Using Functional Magnetic Nanoclusters Mitigates Organ Dysfunction of Sepsis in Swine. SMALL METHODS 2024; 8:e2301428. [PMID: 38161256 DOI: 10.1002/smtd.202301428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 12/18/2023] [Indexed: 01/03/2024]
Abstract
Mitigating sepsis-induced severe organ dysfunction with magnetic nanoparticles has shown remarkable advances in extracorporeal blood treatment. Nevertheless, treating large septic animals remains challenging due to insufficient magnetic separation at rapid blood flow rates (>6 L h-1) and limited incubation time in an extracorporeal circuit. Herein, superparamagnetic nanoclusters (SPNCs) coated with red blood cell (RBC) membranes are developed, which promptly capture and magnetically separate a wide range of pathogens at high blood flow rates in a swine sepsis model. The SPNCs exhibited an ultranarrow size distribution of clustered iron oxide nanocrystals and exceptionally high saturation magnetization (≈ 90 emu g-1) close to that of bulk magnetite. It is also revealed that CD47 on the RBCs allows the RBC-SPNCs to remain at a consistent concentration in the blood by evading innate immunity. The uniform size distribution of the RBC-SPNCs greatly enhances their effectiveness in eradicating various pathogenic materials in extracorporeal blood. The use of RBC-SPNCs for extracorporeal treatment of swine infected with multidrug-resistant E. coli is validated and found that severe bacteremic sepsis-induced organ dysfunction is significantly mitigated after 12 h. The findings highlight the potential application of RBC-SPNCs for extracorporeal therapy of severe sepsis in large animal models and potentially humans.
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Affiliation(s)
- Sung Jin Park
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Inwon Park
- Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, 44919, Republic of Korea
| | - Suhyun Kim
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Min Kyu Kim
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Seonghye Kim
- Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, 44919, Republic of Korea
| | - Hwain Jeong
- Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, 44919, Republic of Korea
| | - Dongsung Kim
- Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, 44919, Republic of Korea
| | - Seung Woo Cho
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Tae-Eun Park
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Aleksey Ni
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Hankwon Lim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Jinmyoung Joo
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
- Center for Genomic Integrity, Institute for Basic Science, Ulsan, 44919, Republic of Korea
| | - Jae Hyuk Lee
- Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, 44919, Republic of Korea
| | - Joo H Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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Nassar MY, El-Salhy HI, El-Shiwiny WH, Abdelaziz G, El-Shiekh R. Composite Nanoarchitectonics of Magnetic Silicon Dioxide-Modified Chitosan for Doxorubicin Delivery and In Vitro Cytotoxicity Assay. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02498-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2022]
Abstract
AbstractDeveloping drug delivery carriers for highly selective, controlled, and sustained release of the anti-cancer drugs is one of the crucial issues in the cancer strive. We herein report the synthesis of Fe3O4 (M) and SiO2 (S) nanoparticles and their nanocomposites with chitosan (CS) for high loading efficiency and subsequent release potentiality of Doxorubicin (DOX) anticancer drug. The as-synthesized nanostructures were characterized using Fourier transform infrared (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and thermal analysis techniques. The average crystallite sizes of the as-prepared M, S, CS/M, CS/S, and CS/M/S nanostructures were found to be 5, 15, 70, 22, and 29 nm, respectively. The loading and cumulative release of Doxorubicin for the produced nanostructures were examined, and the results exhibited loading efficacy of 71%, 95%, 96%, 79%, 17%, and 42% for M, S, CS, CS/M, CS/S, and CS/M/S nanostructures, respectively. The Doxorubicin releasing results revealed a promising cumulative release percentages at pH 4.2 and pH 5 compared with those at pH 7.4. At pH 4.2, the cumulative release percentages for DOX-M, DOX-S, DOX-CS, DOX/M, and DOX/CS/M/S were 94%, 96%, 92%, 95%, and 98%, respectively. While the corresponding percentages at pH 5 were 97%, 90%, 46%, 43%, and 70%. The percentage for DOX-CS/S was 60% at pH 5, though. The in-vitro cytotoxicity of M-DOX, CS-DOX, and M/CS-DOX was explored against two human cancer cell lines (MCF-7 and Hep-G2) using SRB (Sulforhodamine B) assay. The DOX-loaded M/CS exhibited the highest cytotoxicity and its IC50 values were 2.65 and 2.25 μg/mL against Hep-G2 and MCF-7 cell lines, respectively, compared to the corresponding values of 5.1 and 4.5 μg/mL for free DOX. The results indicated that M/CS nanocomposite is a good candidate as drug delivery nano-carrier for the Doxorubicin anti-cancer drug.
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Xiao Z, Zhang L, Colvin VL, Zhang Q, Bao G. Synthesis and Application of Magnetic Nanocrystal Clusters. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04879] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhen Xiao
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Linlin Zhang
- Department of Bioengineering, Rice University, Houston, Texas 77005, United States
| | - Vicki L. Colvin
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Qingbo Zhang
- Department of Bioengineering, Rice University, Houston, Texas 77005, United States
| | - Gang Bao
- Department of Bioengineering, Rice University, Houston, Texas 77005, United States
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Wei X, Kershaw SV, Huang X, Jiao M, Beh CC, Liu C, Sarmadi M, Rogach AL, Jing L. Continuous Flow Synthesis of Persistent Luminescent Chromium-Doped Zinc Gallate Nanoparticles. J Phys Chem Lett 2021; 12:7067-7075. [PMID: 34291946 DOI: 10.1021/acs.jpclett.1c01767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Near-infrared persistent luminescent (or afterglow) nanoparticles with the biologically appropriate size are promising materials for background-free imaging applications, while the conventional batch synthesis hardly allows for reproducibility in controlling particle size because of the random variations of reaction parameters. Here, highly efficient chemistry was matched with an automated continuous flow approach for directly synthesizing differently sized ZnGa2O4:Cr3+ (ZGC) nanoparticles exhibiting long persistent luminescence. The key flow factors responsible for regulating the particle formation process, especially the high pressure-temperature and varied residence time, were investigated to be able to tune the particle size from 2 to 6 nm and to improve the persistent luminescence. Upon silica shell encapsulation of the nanoparticles accompanied by an annealing process, the persistent luminescence of the resulting particles was remarkably enhanced. High-fidelity automated flow chemistry demonstrated here offers an alternative for producing ZGC nanoparticles and will be helpful for other compositionally complex metal oxide nanoparticles.
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Affiliation(s)
- Xiaojun Wei
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
| | - Stephen V Kershaw
- Department of Materials Science and Engineering & Centre for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong SAR, China
| | - Xiaodan Huang
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
| | - Mingxia Jiao
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
- Key Laboratory of Sensor Analysis of Tumor Marker Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Chau Chun Beh
- Western Australia School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Bentley, Western Australia 6102, Australia
| | - Chunyan Liu
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
| | - Morteza Sarmadi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Andrey L Rogach
- Department of Materials Science and Engineering & Centre for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong SAR, China
| | - Lihong Jing
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
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Zhang M, Cao K, Mei L, Wang X, Liao X, Qiao X, Hong C. Detection of AFP by Electrochemical Immunosensor Based on Ag/Fe
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4. ChemistrySelect 2021. [DOI: 10.1002/slct.202003896] [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)
- Mengmeng Zhang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
| | - Kaihang Cao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
| | - Lisha Mei
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
| | - Xiao Wang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
| | - Xiaochen Liao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
| | - Xiuwen Qiao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
| | - Chenglin Hong
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Production and Construction Corps Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
- School of Chemistry and Chemical Engineering Shihezi University Shihezi 832003 PR China
- Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region Shihezi University Shihezi 832003 PR China
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Wei X, Huang X, Zeng Y, Jing L, Tang W, Li X, Ning H, Sun X, Yi Y, Gao M. Longer and Stronger: Improving Persistent Luminescence in Size-Tuned Zinc Gallate Nanoparticles by Alcohol-Mediated Chromium Doping. ACS NANO 2020; 14:12113-12124. [PMID: 32790340 DOI: 10.1021/acsnano.0c05655] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Benefiting from near-infrared persistent luminescence, chromium-doped zinc gallate nanoparticles have become appealing for background-free biomedical imaging applications, where autofluorescence from adjacent tissues no longer poses a problem. Nevertheless, the synthesis of persistent luminescent nanoparticles with controllable and biologically appropriate size, high luminescence intensity, and long persistent duration remains very challenging. Herein, we report a solvothermal synthetic route for preparing differently sized ZnGa2O4:Cr nanoparticles with a particle size tunable from 4 to 31 nm and afterglow duration longer than 20 h. The route involves lower reaction temperatures and involves no reworking of the particles postsynthesis, providing materials that have far fewer unwanted defects and much higher luminescence yields (up to 51%). It was found that methanol played a paramount role in obtaining the Cr3+-doped ZnGa2O4 nanoparticles. The effects of methanol were discussed in combination with NMR spectroscopy studies and theoretical calculations, and the underlying alcohol-mediated growth and doping mechanisms were elucidated, which will be beneficial for developing highly persistent luminescent nanoparticles.
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Affiliation(s)
- Xiaojun Wei
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
| | - Xiaodan Huang
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan Zeng
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Lihong Jing
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
| | - Wen Tang
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Xiaona Li
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Haoran Ning
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaodan Sun
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuanping Yi
- Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Mingyuan Gao
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun, Beijing 100190, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Xiao Z, Zhang Q, Guo X, Villanova J, Hu Y, Külaots I, Garcia-Rojas D, Guo W, Colvin VL. Libraries of Uniform Magnetic Multicore Nanoparticles with Tunable Dimensions for Biomedical and Photonic Applications. ACS APPLIED MATERIALS & INTERFACES 2020; 12:41932-41941. [PMID: 32812740 DOI: 10.1021/acsami.0c09778] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Multicore iron oxide nanoparticles, also known as colloidal nanocrystal clusters, are magnetic materials with diverse applications in biomedicine and photonics. Here, we examine how both of their characteristic dimensional features, the primary particle and sub-micron colloid diameters, influence their magnetic properties and performance in two different applications. The characterization of these basic size-dependent properties is enabled by a synthetic strategy that provides independent control over both the primary nanocrystal and cluster dimensions. Over a wide range of conditions, electron microscopy and X-ray diffraction reveal that the oriented attachment of smaller nanocrystals results in their crystallographic alignment throughout the entire superstructure. We apply a sulfonated polymer with high charge density to prevent cluster aggregation and conjugate molecular dyes to particle surfaces so as to visualize their collection using handheld magnets. These libraries of colloidal clusters, indexed both by primary nanocrystal dimension (dp) and overall cluster diameter (Dc), form magnetic photonic crystals with relatively weak size-dependent properties. In contrast, their performance as MRI T2 contrast agents is highly sensitive to cluster diameter, not primary particle size, and is optimized for materials of 50 nm diameter (r2 = 364 mM-1 s-1). These results exemplify the relevance of dimensional control in developing applications for these versatile materials.
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Affiliation(s)
- Zhen Xiao
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Qingbo Zhang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Xiaoting Guo
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Jake Villanova
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Yue Hu
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Indrek Külaots
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Daniel Garcia-Rojas
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Wenhua Guo
- Shared Equipment Authority, Rice University, Houston, Texas 77005, United States
| | - Vicki L Colvin
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
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Ezzaier H, Marins JA, Claudet C, Hemery G, Sandre O, Kuzhir P. Kinetics of Aggregation and Magnetic Separation of Multicore Iron Oxide Nanoparticles: Effect of the Grafted Layer Thickness. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E623. [PMID: 30126110 PMCID: PMC6116255 DOI: 10.3390/nano8080623] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 07/26/2018] [Accepted: 08/12/2018] [Indexed: 01/09/2023]
Abstract
In this work, we have studied field-induced aggregation and magnetic separation-realized in a microfluidic channel equipped with a single magnetizable micropillar-of multicore iron oxide nanoparticles (IONPs) also called "nanoflowers" of an average size of 27 ± 4 nm and covered by either a citrate or polyethylene (PEG) monolayer having a thickness of 0.2⁻1 nm and 3.4⁻7.8 nm, respectively. The thickness of the adsorbed molecular layer is shown to strongly affect the magnetic dipolar coupling parameter because thicker molecular layers result in larger separation distances between nanoparticle metal oxide multicores thus decreasing dipolar magnetic forces between them. This simple geometrical constraint effect leads to the following important features related to the aggregation and magnetic separation processes: (a) Thinner citrate layer on the IONP surface promotes faster and stronger field-induced aggregation resulting in longer and thicker bulk needle-like aggregates as compared to those obtained with a thicker PEG layer; (b) A stronger aggregation of citrated IONPs leads to an enhanced retention capacity of these IONPs by a magnetized micropillar during magnetic separation. However, the capture efficiency Λ at the beginning of the magnetic separation seems to be almost independent of the adsorbed layer thickness. This is explained by the fact that only a small portion of nanoparticles composes bulk aggregates, while the main part of nanoparticles forms chains whose capture efficiency is independent of the adsorbed layer thickness but depends solely on the Mason number Ma. More precisely, the capture efficiency shows a power law trend Λ ∝ M a−n, with n ≈ 1.4⁻1.7 at 300 < Ma < 10⁴, in agreement with a new theoretical model. Besides these fundamental issues, the current work shows that the multicore IONPs with a size of about 30 nm have a good potential for use in biomedical sensor applications where an efficient low-field magnetic separation is required. In these applications, the nanoparticle surface design should be carried out in a close feedback with the magnetic separation study in order to find a compromise between biological functionalities of the adsorbed molecular layer and magnetic separation efficiency.
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Affiliation(s)
- Hinda Ezzaier
- CNRS UMR 7010 Institute of Physics of Nice (INPHYNI), University Côte d'Azur, Parc Valrose, 06108 Nice, France.
- Laboratory of Physics of Lamellar Materials and Hybrid Nano-Materials, Faculty of Sciences of Bizerte, University of Carthage, Zarzouna 7021, Tunisia.
| | - Jéssica Alves Marins
- CNRS UMR 7010 Institute of Physics of Nice (INPHYNI), University Côte d'Azur, Parc Valrose, 06108 Nice, France.
| | - Cyrille Claudet
- CNRS UMR 7010 Institute of Physics of Nice (INPHYNI), University Côte d'Azur, Parc Valrose, 06108 Nice, France.
| | - Gauvin Hemery
- CNRS UMR 5629, Laboratoire de Chimie des Polymères Organiques (LCPO), University of Bordeaux, ENSCBP 16 Avenue Pey Berland, 33607 Pessac, France.
| | - Olivier Sandre
- CNRS UMR 5629, Laboratoire de Chimie des Polymères Organiques (LCPO), University of Bordeaux, ENSCBP 16 Avenue Pey Berland, 33607 Pessac, France.
| | - Pavel Kuzhir
- CNRS UMR 7010 Institute of Physics of Nice (INPHYNI), University Côte d'Azur, Parc Valrose, 06108 Nice, France.
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