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Ong JF, Zubarev A, Berceanu AC, Cuzminschi M, Tesileanu O. Nanowire implosion under laser amplified spontaneous emission pedestal irradiation. Sci Rep 2023; 13:20699. [PMID: 38001241 PMCID: PMC10673875 DOI: 10.1038/s41598-023-48090-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 11/22/2023] [Indexed: 11/26/2023] Open
Abstract
Nanowire array targets exhibit high optical absorption when interacting with short, intense laser pulses. This leads to an increased yield in the production of accelerated particles for a variety of applications. However, these interactions are sensitive to the laser prepulse and could be significantly affected. Here, we show that an array of aligned nanowires is imploded when irradiated by an Amplified Spontaneous Emission pedestal of a [Formula: see text] laser with an intensity on the order of [Formula: see text]. Using radiation hydrodynamics simulations, we demonstrate that the electron density profile is radially compressed at the tip by the rocket-like propulsion of the ablated plasma. The mass density compression increases up to [Formula: see text] when a more dense nanowire array is used. This is due to the ablation pressure from the neighboring nanowires. These findings offer valuable information for selecting an appropriate target design for experiments aimed at enhancing production of accelerated particles.
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Affiliation(s)
- J F Ong
- Extreme Light Infrastructure - Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R &D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania.
| | - A Zubarev
- Extreme Light Infrastructure - Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R &D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
- National Institute for Laser, Plasma and Radiation Physics, 077125, Bucharest-Măgurele, Romania
| | - A C Berceanu
- Extreme Light Infrastructure - Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R &D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
| | - M Cuzminschi
- Horia Hulubei National Institute for R &D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
- Faculty of Physics, University of Bucharest, 077125, Bucharest-Măgurele, Romania
| | - O Tesileanu
- Extreme Light Infrastructure - Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R &D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
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Ponnapa Reddy M, Subramaniam A, Afroz A, Billah B, Lim ZJ, Zubarev A, Blecher G, Tiruvoipati R, Ramanathan K, Wong SN, Brodie D, Fan E, Shekar K. Prone Positioning of Nonintubated Patients With Coronavirus Disease 2019-A Systematic Review and Meta-Analysis. Crit Care Med 2021; 49:e1001-e1014. [PMID: 33927120 PMCID: PMC8439644 DOI: 10.1097/ccm.0000000000005086] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVES Several studies have reported prone positioning of nonintubated patients with coronavirus diseases 2019-related hypoxemic respiratory failure. This systematic review and meta-analysis evaluated the impact of prone positioning on oxygenation and clinical outcomes. DESIGN AND SETTING We searched PubMed, Embase, and the coronavirus diseases 2019 living systematic review from December 1, 2019, to November 9, 2020. SUBJECTS AND INTERVENTION Studies reporting prone positioning in hypoxemic, nonintubated adult patients with coronavirus diseases 2019 were included. MEASUREMENTS AND MAIN RESULTS Data on prone positioning location (ICU vs non-ICU), prone positioning dose (total minutes/d), frequency (sessions/d), respiratory supports during prone positioning, relative changes in oxygenation variables (peripheral oxygen saturation, Pao2, and ratio of Pao2 to the Fio2), respiratory rate pre and post prone positioning, intubation rate, and mortality were extracted. Twenty-five observational studies reporting prone positioning in 758 patients were included. There was substantial heterogeneity in prone positioning location, dose and frequency, and respiratory supports provided. Significant improvements were seen in ratio of Pao2 to the Fio2 (mean difference, 39; 95% CI, 25-54), Pao2 (mean difference, 20 mm Hg; 95% CI, 14-25), and peripheral oxygen saturation (mean difference, 4.74%; 95% CI, 3-6%). Respiratory rate decreased post prone positioning (mean difference, -3.2 breaths/min; 95% CI, -4.6 to -1.9). Intubation and mortality rates were 24% (95% CI, 17-32%) and 13% (95% CI, 6-19%), respectively. There was no difference in intubation rate in those receiving prone positioning within and outside ICU (32% [69/214] vs 33% [107/320]; p = 0.84). No major adverse events were recorded in small subset of studies that reported them. CONCLUSIONS Despite the significant variability in frequency and duration of prone positioning and respiratory supports applied, prone positioning was associated with improvement in oxygenation variables without any reported serious adverse events. The results are limited by a lack of controls and adjustments for confounders. Whether this improvement in oxygenation results in meaningful patient-centered outcomes such as reduced intubation or mortality rates requires testing in well-designed randomized clinical trials.
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Affiliation(s)
- Mallikarjuna Ponnapa Reddy
- Department of Intensive Care Medicine, Calvary Hospital, ACT, Australia
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia
| | - Ashwin Subramaniam
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC, Australia
| | - Afsana Afroz
- Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia
| | - Baki Billah
- Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia
| | - Zheng Jie Lim
- Department of Intensive Care Medicine, Ballarat Health Services, Ballarat, VIC, Australia
| | - Alexandr Zubarev
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia
| | - Gabriel Blecher
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC, Australia
- Department of Emergency, Monash Health, Clayton, VIC, Australia
| | - Ravindranath Tiruvoipati
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC, Australia
| | - Kollengode Ramanathan
- Department of Intensive Care Medicine, Calvary Hospital, ACT, Australia
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC, Australia
- Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia
- Department of Intensive Care Medicine, Ballarat Health Services, Ballarat, VIC, Australia
- Department of Emergency, Monash Health, Clayton, VIC, Australia
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- National University Hospital, Singapore
- Faculty of Medicine, Bond University, Gold Coast, QLD, Australia
- Department of Medicine, Columbia University College of Physicians and Surgeons, and Center for Acute Respiratory Failure, New York-Presbyterian Hospital, New York, NY
- Interdepartmental Division of Critical Care Medicine and Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada
- Adult Intensive Care Services, the Prince Charles Hospital, Brisbane, QLD, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane; Faculty of Medicine, University of Queensland, Brisbane, QLD, Australia
| | - Suei Nee Wong
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Daniel Brodie
- Department of Medicine, Columbia University College of Physicians and Surgeons, and Center for Acute Respiratory Failure, New York-Presbyterian Hospital, New York, NY
| | - Eddy Fan
- Interdepartmental Division of Critical Care Medicine and Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada
| | - Kiran Shekar
- Faculty of Medicine, Bond University, Gold Coast, QLD, Australia
- Adult Intensive Care Services, the Prince Charles Hospital, Brisbane, QLD, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane; Faculty of Medicine, University of Queensland, Brisbane, QLD, Australia
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Vazquez-Perez F, Gila-Vilchez C, Duran J, Zubarev A, Alvarez de Cienfuegos L, Rodriguez-Arco L, Lopez-Lopez M. Composite polymer hydrogels with high and reversible elongation under magnetic stimuli. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124093] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Muntyanu A, Ghazawi F, Zubarev A, Litvinov I. 353 Geographic variations in cutaneous melanoma in the Russian Federation. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.02.375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Raboisson-Michel M, Queiros Campos J, Schaub S, Zubarev A, Verger-Dubois G, Kuzhir P. Kinetics of field-induced phase separation of a magnetic colloid under rotating magnetic fields. J Chem Phys 2020; 153:154902. [DOI: 10.1063/5.0023706] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- M. Raboisson-Michel
- Université Côte d’Azur, CNRS UMR 7010, Institute of Physics of Nice, Parc Valrose, 06108 Nice, France
- Axlepios Biomedical, 1ere Avenue 5eme rue, 06510 Carros, France
| | - J. Queiros Campos
- Université Côte d’Azur, CNRS UMR 7010, Institute of Physics of Nice, Parc Valrose, 06108 Nice, France
| | - S. Schaub
- Sorbonne University, CNRS, Developmental Biology Laboratory (LBDV), Quai de la Darse, 06234 Villefranche-sur-Mer Cedex, France
| | - A. Zubarev
- Theoretical and Mathematical Physics Department, Institute of Natural Sciences and Mathematics, Ural Federal University, Lenin Ave., 51, Ekaterinburg 620083, Russia
- M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
| | | | - P. Kuzhir
- Université Côte d’Azur, CNRS UMR 7010, Institute of Physics of Nice, Parc Valrose, 06108 Nice, France
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Abstract
Vanishing bile duct syndrome (VBDS) refers to a group of acquired disorders associated with progressive destruction and disappearance of the intrahepatic bile ducts. We report a case of meropenem-induced VBDS in a patient who had undergone surgical repair of a ruptured abdominal aortic aneurysm. Meropenem was used to treat Serratia marcescens isolated from blood, urine, sputum, and wound swab cultures. The patient developed severe mixed liver injury with no obstruction noted in radiological imaging. Because of the patient's increasing serum bilirubin level, VBDS was suspected and the meropenem was therefore changed to ciprofloxacin on postoperative day 18. Although the bilirubin level decreased, meropenem was restarted 3 days later because of clinical concerns regarding worsening fever and sepsis. Restarting meropenem was associated with an immediate increase in the serum bilirubin level. This further increase in bilirubin after reintroduction of meropenem strongly suggested meropenem-induced VBDS. The antibiotic therapy was changed from meropenem to ciprofloxacin and metronidazole, leading to a dramatic decrease in the bilirubin level to normal within a few weeks. In patients receiving meropenem, VBDS as a cause of deranged liver function and cholestasis should be considered after ruling out mechanical and other probable causes of liver injury.
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Affiliation(s)
- Alexandr Zubarev
- Department of Intensive Care Medicine, Frankston Hospital, Frankston, VIC 3199, Australia
| | - Kavi Haji
- Department of Intensive Care Medicine, Frankston Hospital, Frankston, VIC 3199, Australia
- School of Public Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, VIC 3800, Australia
| | - Matthew Li
- Department of Pharmacy, Frankston Hospital, Frankston, VIC 3199, Australia
| | - Ravindranath Tiruvoipati
- Department of Intensive Care Medicine, Frankston Hospital, Frankston, VIC 3199, Australia
- School of Public Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, VIC 3800, Australia
- Ravindranath Tiruvoipati, Department of Intensive Care Medicine, Frankston Hospital, 2 Hastings Road (PO Box 52), Frankston, Victoria 3199, Australia. E-mail:
| | - John Botha
- Department of Intensive Care Medicine, Frankston Hospital, Frankston, VIC 3199, Australia
- School of Public Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, VIC 3800, Australia
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Muntyanu A, Savin E, Ghazawi F, Alakel A, Zubarev A, Litvinov I. LB950 Geographic variations in cutaneous malignant melanoma distribution in Russian Federation. J Invest Dermatol 2020. [DOI: 10.1016/j.jid.2020.05.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Cattelan L, Ghazawi FM, Le M, Savin E, Zubarev A, Lagacé F, Sasseville D, Waschke K, Litvinov IV. Investigating epidemiologic trends and the geographic distribution of patients with anal squamous cell carcinoma throughout Canada. Curr Oncol 2020; 27:e294-e306. [PMID: 32669936 PMCID: PMC7339845 DOI: 10.3747/co.27.6061] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Background Anal cancer is a rare disease, constituting 0.5% of new cancer cases in the United States. The most common subtype is squamous cell carcinoma (scc). Studies in several developed nations have reported on an increasing incidence of anal cancer in recent decades, and various risk factors pertaining to the pathogenesis of the disease have been identified, including infection with the human papillomavirus, tobacco use, and immunosuppression. The epidemiology and distribution of anal scc throughout Canada remain poorly understood, however. Methods Using 3 population-based cancer registries, a retrospective analysis of demographic data across Canada for 1992-2010 was performed. The incidence and mortality for anal scc was examined at the levels of provinces, cities, and the forward sortation area (FSA) component (first 3 characters) of postal codes. Results During 1992-2010, 3720 individuals were diagnosed with anal scc in Canada; 64% were women. The overall national incidence rate was 6.3 cases per million population per year, with an average age at diagnosis of 60.4 years. The incidence increased over time, with significantly higher incidence rates documented in British Columbia and Nova Scotia (9.3 cases per million population each). Closer examination revealed clustering of cases in various urban centres and self-identified lgbtq communities in Toronto, Montreal, and Vancouver. Discussion This study provides, for the first time, a comprehensive analysis of the burden of anal scc in Canada, identifying susceptible populations and shedding light onto novel avenues of research to lower the incidence of anal cancer throughout the country.
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Affiliation(s)
- L Cattelan
- Department of Medicine, McGill University, Montreal, QC
| | - F M Ghazawi
- Division of Dermatology, University of Ottawa, Ottawa, ON
| | - M Le
- Division of Dermatology, McGill University, Montreal, QC
| | - E Savin
- Division of Dermatology, McGill University, Montreal, QC
| | - A Zubarev
- Division of Dermatology, McGill University, Montreal, QC
| | - F Lagacé
- Department of Medicine, McGill University, Montreal, QC
| | - D Sasseville
- Division of Dermatology, McGill University, Montreal, QC
| | - K Waschke
- Division of Gastroenterology, McGill University, Montreal, QC
| | - I V Litvinov
- Division of Dermatology, McGill University, Montreal, QC
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Roy SF, Ghazawi FM, Le M, Lagacé F, Roy CF, Rahme E, Savin E, Zubarev A, Sasseville D, Popradi G, Litvinov IV. Epidemiology of adult and pediatric Burkitt lymphoma in Canada: sequelae of the HIV epidemic. ACTA ACUST UNITED AC 2020; 27:83-89. [PMID: 32489250 DOI: 10.3747/co.27.5775] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Background Although the pathogenesis and epidemiology of endemic Burkitt lymphoma (bl) have been extensively studied, the epidemiologic landscape of sporadic and immunodeficiency-associated bl in North America remains poorly understood. Methods We used 3 distinct population-based cancer registries to retrospectively study bl incidence and mortality in Canada. Data for patient sex; age at the time of diagnosis; and reporting province, city, and forward sortation area (fsa, the first three characters of a postal code) were analyzed. Results During 1992-2010, 1420 patients with bl in Canada were identified (incidence rate: 2.40 cases per million patient-years), of which 71.1% were male patients. Mean age at diagnosis was 55.5 ± 20.8 years. A bimodal incidence by age distribution was seen in both sexes, with pediatric- and adult-onset peaks. An analysis based on fsas identified select communities with statistically higher rates of adult bl. Several of those fsas were located within the 3 major metropolitan areas (Montreal, Vancouver, Toronto) and within self-identified lgbtq communities. The fsas with a higher socioeconomic status score were associated with lower rates of bl. Conclusions Current results highlight the geographic and historic pattern of bl in Canada. The human immunodeficiency virus remains an important risk factor for adult bl.
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Affiliation(s)
- S F Roy
- Division of Pathology, University of Montreal, Montreal, QC
| | - F M Ghazawi
- Division of Dermatology, University of Ottawa, Ottawa, ON
| | - M Le
- Division of Dermatology, McGill University, Montreal, QC
| | - F Lagacé
- Division of Dermatology, McGill University, Montreal, QC.,Faculty of Medicine, McGill University, Montreal, QC
| | - C F Roy
- Faculty of Medicine, McGill University, Montreal, QC
| | - E Rahme
- Division of Clinical Epidemiology, McGill University, Montreal, QC
| | - E Savin
- Division of Dermatology, McGill University, Montreal, QC
| | - A Zubarev
- Division of Dermatology, McGill University, Montreal, QC
| | - D Sasseville
- Division of Dermatology, McGill University, Montreal, QC
| | - G Popradi
- Division of Hematology, McGill University, Montreal, QC
| | - I V Litvinov
- Division of Dermatology, McGill University, Montreal, QC
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Le M, Ghazawi FM, Alakel A, Netchiporouk E, Rahme E, Zubarev A, Powell M, Moreau L, Roshdy O, Glassman SJ, Sasseville D, Popradi G, Litvinov IV. Incidence and mortality trends and geographic patterns of follicular lymphoma in Canada. ACTA ACUST UNITED AC 2019; 26:e473-e481. [PMID: 31548815 DOI: 10.3747/co.26.4625] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Background Follicular lymphoma (fl) is the most common indolent lymphoma and the 2nd most common non-Hodgkin lymphoma, accounting for 10%-20% of all lymphomas in the Western world. Epidemiologic and geographic trends of fl in Canada have not been investigated. Our study's objective was to analyze incidence and mortality rates and the geographic distribution of fl patients in Canada for 1992-2010. Methods Demographic and geographic patient data for fl cases were obtained using the Canadian Cancer Registry, the Registre québécois du cancer, and the Canadian Vital Statistics database. Incidence and mortality rates and 95% confidence intervals were calculated per year and per geographic area. Rates were plotted using linear regression models to assess trends over time. Overall data were mapped using Microsoft Excel mapping software (Redmond, WA, U.S.A.) to identify case clusters across Canada. Results Approximately 22,625 patients were diagnosed with fl during 1992-2010. The age-standardized incidence rate of this malignancy in Canada was 38.3 cases per million individuals per year. Geographic analysis demonstrated that a number of Maritime provinces and Manitoba had the highest incidence rates, and that the provinces of Nova Scotia and Quebec had the highest mortality rates in the nation. Regional data demonstrated clustering of fl within cities or regions with high herbicide use, primary mining, and a strong manufacturing presence. Conclusions Our study provides a comprehensive overview of the fl burden and its geographic distribution in Canada. Regional clustering of this disease in concentrated industrial zones strongly suggests that multiple environmental factors might play a crucial role in the development of this lymphoma.
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Affiliation(s)
- M Le
- Division of Dermatology, McGill University, Montreal, QC
| | - F M Ghazawi
- Division of Dermatology, University of Ottawa, Ottawa, ON
| | - A Alakel
- The Ottawa Hospital Research Institute, Ottawa, ON
| | - E Netchiporouk
- Division of Dermatology, McGill University, Montreal, QC
| | - E Rahme
- Division of Clinical Epidemiology, McGill University, Montreal, QC
| | - A Zubarev
- Division of Dermatology, McGill University, Montreal, QC
| | - M Powell
- Division of Dermatology, McGill University, Montreal, QC
| | - L Moreau
- Division of Dermatology, McGill University, Montreal, QC
| | - O Roshdy
- Division of Dermatology, McGill University, Montreal, QC
| | - S J Glassman
- Division of Dermatology, University of Ottawa, Ottawa, ON
| | - D Sasseville
- Division of Dermatology, McGill University, Montreal, QC
| | - G Popradi
- Division of Hematology, McGill University, Montreal, QC
| | - I V Litvinov
- Division of Dermatology, McGill University, Montreal, QC.,Division of Dermatology, University of Ottawa, Ottawa, ON
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Bonhome-Espinosa AB, Campos F, Rodriguez IA, Carriel V, Marins JA, Zubarev A, Duran JDG, Lopez-Lopez MT. Effect of particle concentration on the microstructural and macromechanical properties of biocompatible magnetic hydrogels. Soft Matter 2017; 13:2928-2941. [PMID: 28357436 DOI: 10.1039/c7sm00388a] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We analyze the effect of nanoparticle concentration on the physical properties of magnetic hydrogels consisting of polymer networks of the human fibrin biopolymer with embedded magnetic particles, swollen by a water-based solution. We prepared these magnetic hydrogels by polymerization of mixtures consisting mainly of human plasma and magnetic nanoparticles with OH- functionalization. Microscopic observations revealed that magnetic hydrogels presented some cluster-like knots that were connected by several fibrin threads. By contrast, nonmagnetic hydrogels presented a homogeneous net-like structure with only individual connections between pairs of fibers. The rheological analysis demonstrated that the rigidity modulus, as well as the viscoelastic moduli, increased quadratically with nanoparticle content following a square-like function. Furthermore, we found that time for gel point was shorter in the presence of magnetic nanoparticles. Thus, we can conclude that nanoparticles favor the cross-linking process, serving as nucleation sites for the attachment of the fibrin polymer. Attraction between the positive groups of the fibrinogen, from which the fibrin is polymerized, and the negative OH- groups of the magnetic particle surface qualitatively justifies the positive role of the nanoparticles in the enhancement of the mechanical properties of the magnetic hydrogels. Indeed, we developed a theoretical model that semiquantitatively explains the experimental results by assuming the indirect attraction of the fibrinogen through the attached nanoparticles. Due to this attraction the monomers condense into nuclei of the dense phase and by the end of the polymerization process the nuclei (knots) of the dense phase cross-link the fibrin threads, which enhances their mechanical properties.
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Ezzaier H, Alves Marins J, Razvin I, Abbas M, Ben Haj Amara A, Zubarev A, Kuzhir P. Two-stage kinetics of field-induced aggregation of medium-sized magnetic nanoparticles. J Chem Phys 2017; 146:114902. [DOI: 10.1063/1.4977993] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- H. Ezzaier
- University Côte d’Azur, CNRS UMR 7010 Institute of Physics of Nice, Parc Valrose, Nice 06100, France
- Laboratory of Physics of Lamellar Materials and Hybrid Nano-Materials, Faculty of Sciences of Bizerte, University of Carthage, 7021 Zarzouna, Tunisia
| | - J. Alves Marins
- University Côte d’Azur, CNRS UMR 7010 Institute of Physics of Nice, Parc Valrose, Nice 06100, France
| | - I. Razvin
- University Côte d’Azur, CNRS UMR 7010 Institute of Physics of Nice, Parc Valrose, Nice 06100, France
| | - M. Abbas
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Allée Emile Monso, 31030 Toulouse, France
| | - A. Ben Haj Amara
- Laboratory of Physics of Lamellar Materials and Hybrid Nano-Materials, Faculty of Sciences of Bizerte, University of Carthage, 7021 Zarzouna, Tunisia
| | - A. Zubarev
- Department of Mathematical Physics, Urals Federal University, Lenina Ave. 51, 620083 Ekaterinburg, Russia
| | - P. Kuzhir
- University Côte d’Azur, CNRS UMR 7010 Institute of Physics of Nice, Parc Valrose, Nice 06100, France
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Orlandi G, Kuzhir P, Izmaylov Y, Alves Marins J, Ezzaier H, Robert L, Doutre F, Noblin X, Lomenech C, Bossis G, Meunier A, Sandoz G, Zubarev A. Microfluidic separation of magnetic nanoparticles on an ordered array of magnetized micropillars. Phys Rev E 2016; 93:062604. [PMID: 27415317 DOI: 10.1103/physreve.93.062604] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Indexed: 06/06/2023]
Abstract
Microfluidic separation of magnetic particles is based on their capture by magnetized microcollectors while the suspending fluid flows past the microcollectors inside a microchannel. Separation of nanoparticles is often challenging because of strong Brownian motion. Low capture efficiency of nanoparticles limits their applications in bioanalysis. However, at some conditions, magnetic nanoparticles may undergo field-induced aggregation that amplifies the magnetic attractive force proportionally to the aggregate volume and considerably increases nanoparticle capture efficiency. In this paper, we have demonstrated the role of such aggregation on an efficient capture of magnetic nanoparticles (about 80 nm in diameter) in a microfluidic channel equipped with a nickel micropillar array. This array was magnetized by an external uniform magnetic field, of intensity as low as 6-10 kA/m, and experiments were carried out at flow rates ranging between 0.3 and 30 μL/min. Nanoparticle capture is shown to be mostly governed by the Mason number Ma, while the dipolar coupling parameter α does not exhibit a clear effect in the studied range, 1.4 < α < 4.5. The capture efficiency Λ shows a strongly decreasing Mason number behavior, Λ∝Ma^{-1.78} within the range 32 ≤ Ma ≤ 3250. We have proposed a simple theoretical model which considers destructible nanoparticle chains and gives the scaling behavior, Λ∝Ma^{-1.7}, close to the experimental findings.
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Affiliation(s)
- G Orlandi
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - P Kuzhir
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - Y Izmaylov
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - J Alves Marins
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - H Ezzaier
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
- Laboratory of Physics of Lamellar Materials and Hybrid Nano-Materials, Faculty of Sciences of Bizerte, University of Carthage, 7021 Zarzouna, Tunisia
| | - L Robert
- Franche-Comté Electronique Mécanique Thermique et Optique-Sciences et Technologies, CNRS UMR 6174, 15B avenue des Montboucons, 25030 Besançon, France
| | - F Doutre
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - X Noblin
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - C Lomenech
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - G Bossis
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - A Meunier
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics-UMR 7336, Parc Valrose, 06100 Nice, France
| | - G Sandoz
- University of Nice-Sophia Antipolis, CNRS, INSERM, Institut de Biologie de Valrose-UMR 7277, UMR-S 1091, Parc Valrose, 06100 Nice, France
| | - A Zubarev
- Urals Federal University, Lenina Avenue 51, 620083 Ekaterinburg, Russia
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Smolenov E, Ragulin Y, Starodubtcev A, Kurilchik A, Usachev V, Zubarev A, Ivanov V. Surgical Treatment of Synchronous Lung Metastasis in Patient with Osteosarcomas and Soft Tissue Sarcomas. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv051.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Magnet C, Kuzhir P, Bossis G, Meunier A, Nave S, Zubarev A, Lomenech C, Bashtovoi V. Behavior of nanoparticle clouds around a magnetized microsphere under magnetic and flow fields. Phys Rev E Stat Nonlin Soft Matter Phys 2014; 89:032310. [PMID: 24730845 DOI: 10.1103/physreve.89.032310] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Indexed: 06/03/2023]
Abstract
When a micron-sized magnetizable particle is introduced into a suspension of nanosized magnetic particles, the nanoparticles accumulate around the microparticle and form thick anisotropic clouds extended in the direction of the applied magnetic field. This phenomenon promotes colloidal stabilization of bimodal magnetic suspensions and allows efficient magnetic separation of nanoparticles used in bioanalysis and water purification. In the present work, the size and shape of nanoparticle clouds under the simultaneous action of an external uniform magnetic field and the flow have been studied in detail. In experiments, a dilute suspension of iron oxide nanoclusters (of a mean diameter of 60 nm) was pushed through a thin slit channel with the nickel microspheres (of a mean diameter of 50 μm) attached to the channel wall. The behavior of nanocluster clouds was observed in the steady state using an optical microscope. In the presence of strong enough flow, the size of the clouds monotonically decreases with increasing flow speed in both longitudinal and transverse magnetic fields. This is qualitatively explained by enhancement of hydrodynamic forces washing the nanoclusters away from the clouds. In the longitudinal field, the flow induces asymmetry of the front and the back clouds. To explain the flow and the field effects on the clouds, we have developed a simple model based on the balance of the stresses and particle fluxes on the cloud surface. This model, applied to the case of the magnetic field parallel to the flow, captures reasonably well the flow effect on the size and shape of the cloud and reveals that the only dimensionless parameter governing the cloud size is the ratio of hydrodynamic-to-magnetic forces-the Mason number. At strong magnetic interactions considered in the present work (dipolar coupling parameter α≥2), the Brownian motion seems not to affect the cloud behavior.
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Affiliation(s)
- C Magnet
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics, UMR 7336, 28 avenue Joseph Vallot, 06100 Nice, France
| | - P Kuzhir
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics, UMR 7336, 28 avenue Joseph Vallot, 06100 Nice, France
| | - G Bossis
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics, UMR 7336, 28 avenue Joseph Vallot, 06100 Nice, France
| | - A Meunier
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics, UMR 7336, 28 avenue Joseph Vallot, 06100 Nice, France
| | - S Nave
- University of Nice-Sophia Antipolis, CNRS, Laboratory of Condensed Matter Physics, UMR 7336, 28 avenue Joseph Vallot, 06100 Nice, France
| | - A Zubarev
- Department of Mathematical Physics, Ural Federal University, 51 Prospekt Lenina, Ekaterinburg 620083, Russia
| | - C Lomenech
- University of Nice-Sophia Antipolis, Laboratory ECOMERS (Ecosystèmes Côtiers Marins et Réponses aux Stress), EA 4228, 28 avenue Valrose, 06108 Nice Cedex 2, France
| | - V Bashtovoi
- Belarusian National Technical University, UNESCO Department "Energy Conservation and Renewable Energies", 65 Prospekt Nezavisimosti, 220013 Minsk, Belarus
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16
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Magnet C, Kuzhir P, Bossis G, Meunier A, Suloeva L, Zubarev A. Haloing in bimodal magnetic colloids: the role of field-induced phase separation. Phys Rev E Stat Nonlin Soft Matter Phys 2012; 86:011404. [PMID: 23005414 DOI: 10.1103/physreve.86.011404] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2012] [Revised: 06/20/2012] [Indexed: 06/01/2023]
Abstract
If a suspension of magnetic micrometer-sized and nanosized particles is subjected to a homogeneous magnetic field, the nanoparticles are attracted to the microparticles and form thick anisotropic halos (clouds) around them. Such clouds can hinder the approach of microparticles and result in effective repulsion between them [M. T. López-López, A. Yu. Zubarev, and G. Bossis, Soft Matter 6, 4346 (2010)]. In this paper, we present detailed experimental and theoretical studies of nanoparticle concentration profiles and of the equilibrium shapes of nanoparticle clouds around a single magnetized microsphere, taking into account interactions between nanoparticles. We show that at a strong enough magnetic field, the ensemble of nanoparticles experiences a gas-liquid phase transition such that a dense liquid phase is condensed around the magnetic poles of a microsphere while a dilute gas phase occupies the rest of the suspension volume. Nanoparticle accumulation around a microsphere is governed by two dimensionless parameters--the initial nanoparticle concentration (φ(0)) and the magnetic-to-thermal energy ratio (α)--and the three accumulation regimes are mapped onto a α-φ(0) phase diagram. Our local thermodynamic equilibrium approach gives a semiquantitative agreement with the experiments on the equilibrium shapes of nanoparticle clouds. The results of this work could be useful for the development of the bimodal magnetorheological fluids and of the magnetic separation technologies used in bioanalysis and water purification systems.
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Affiliation(s)
- C Magnet
- Laboratory of Condensed Matter Physics, University of Nice Sophia Antipolis, CNRS UMR 7663, Parc Valrose, 06108 Nice Cedex 2, France
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Abstract
We present results of a theoretical study of the magnetorheological viscosity η of a suspension versus the applied magnetic field H and shear rate [Formula: see text]. It is supposed that the macroscopic rheological effects are provided by linear chain-like aggregates. Unlike in traditional models, the natural statistical distribution of the chains over the number of particles in them is taken into account. The results obtained explain important features of the rheological η versus [Formula: see text] law, which has been detected in experiments but qualitatively contradicts known theories of rheological properties of magnetic suspensions.
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Affiliation(s)
- A Zubarev
- Department of Mathematical Physics, Ural State University, Lenin Avenue 51, Ekaterinburg, Russia
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Bossis G, Métayer C, Zubarev A. Analysis of chaining structures in colloidal suspensions subjected to an electric field. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 76:041401. [PMID: 17994982 DOI: 10.1103/physreve.76.041401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2006] [Revised: 04/26/2007] [Indexed: 05/25/2023]
Abstract
Structures formed by a colloidal suspension of silica particles in 4-methyl cyclohexanol have been analyzed in the presence of an electric field. The formation of chains of particles was detected using an elliptical mirror to collect scattered light and a nearly matched refractive index between particles and solvent. A numerical method has been developed to obtain the size distribution of chains and their kinetics of formation from the record of a two-dimensional map of scattered light. We have compared the experimental size distribution to the prediction of a statistical theory based on a minimization of the free energy of a gas of chains. This theory quite well reproduced the experimental results for small chains but overestimates the tail of the distribution at high field. A saturation of the average size of chains versus the electric field was observed experimentally instead of a continuous growth as would be expected from aggregation under dipolar forces. A kinetic model, taking into account both capture and escape rates of a particle at the extremity of a chain, was shown to reproduce well the experimental growth of the average size of chains with time.
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Affiliation(s)
- G Bossis
- Laboratoire de Physique de la Matière Condensée, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
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