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Gomes DSB, Paterno LG, Santos ABS, Barbosa DPP, Holtz BM, Souza MR, Moraes-Souza RQ, Garay AV, de Andrade LR, Sartoratto PPC, Mertz D, Volpato GT, Freitas SM, Soler MAG. UV-Accelerated Synthesis of Gold Nanoparticle-Pluronic Nanocomposites for X-ray Computed Tomography Contrast Enhancement. Polymers (Basel) 2023; 15:polym15092163. [PMID: 37177309 PMCID: PMC10181159 DOI: 10.3390/polym15092163] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/01/2023] [Accepted: 04/05/2023] [Indexed: 05/15/2023] Open
Abstract
Eco-friendly chemical methods using FDA-approved Pluronic F127 (PLU) block copolymer have garnered much attention for simultaneously forming and stabilizing Au nanoparticles (AuNPs). Given the remarkable properties of AuNPs for usage in various fields, especially in biomedicine, we performed a systematic study to synthesize AuNP-PLU nanocomposites under optimized conditions using UV irradiation for accelerating the reaction. The use of UV irradiation at 254 nm resulted in several advantages over the control method conducted under ambient light (control). The AuNP-PLU-UV nanocomposite was produced six times faster, lasting 10 min, and exhibited lower size dispersion than the control. A set of experimental techniques was applied to determine the structure and morphology of the produced nanocomposites as affected by the UV irradiation. The MTT assay was conducted to estimate IC50 values of AuNP-PLU-UV in NIH 3T3 mouse embryonic fibroblasts, and the results suggest that the sample is more compatible with cells than control samples. Afterward, in vivo maternal and fetal toxicity assays were performed in rats to evaluate the effect of AuNP-PLU-UV formulation during pregnancy. Under the tested conditions, the treatment was found to be safe for the mother and fetus. As a proof of concept or application, the synthesized Au:PLU were tested as contrast agents with an X-ray computed tomography scan (X-ray CT).
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Affiliation(s)
- Deizilene S B Gomes
- Universidade de Brasilia, Instituto de Física, Laboratório de Nanofilmes e Nano Dispositivos, Brasilia-DF 70910-900, Brazil
- Instituto Federal de Educação, Ciencia e Tecnologia de Rondonia, Ji-Parana-RO 76900-730, Brazil
| | - Leonardo G Paterno
- Universidade de Brasilia, Instituto de Quimica, Laboratorio de Pesquisa em Polimeros e Nanomateriais, Brasilia-DF 70910-900, Brazil
| | - Aline B S Santos
- Universidade de Brasilia, Instituto de Física, Laboratório de Nanofilmes e Nano Dispositivos, Brasilia-DF 70910-900, Brazil
| | - Debora P P Barbosa
- Universidade de Brasilia, Instituto de Física, Laboratório de Nanofilmes e Nano Dispositivos, Brasilia-DF 70910-900, Brazil
| | - Beatriz M Holtz
- Federal University of Mato Grosso, Institute of Biological and Health Sciences, Laboratory of System Physiology and Reproductive Toxicology, Barra do Garças-MT 78605-091, Brazil
| | - Maysa R Souza
- Federal University of Mato Grosso, Institute of Biological and Health Sciences, Laboratory of System Physiology and Reproductive Toxicology, Barra do Garças-MT 78605-091, Brazil
| | - Rafaianne Q Moraes-Souza
- Federal University of Mato Grosso, Institute of Biological and Health Sciences, Laboratory of System Physiology and Reproductive Toxicology, Barra do Garças-MT 78605-091, Brazil
| | - Aisel V Garay
- Universidade de Brasilia, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Laboratório de Biofisica Molecular, Brasilia-DF 70910-900, Brazil
| | - Laise R de Andrade
- Universidade de Brasilia, Instituto de Ciências Biologicas, Brasilia-DF 70910-900, Brazil
| | | | - Damien Mertz
- Institut de Physique et Chimie des Materiaux de Strasbourg (IPCMS), UMR-7504 CNRS-Universite de Strasbourg, 23 rue du Loess, BP 34, CEDEX 02, 67034 Strasbourg, France
| | - Gustavo T Volpato
- Federal University of Mato Grosso, Institute of Biological and Health Sciences, Laboratory of System Physiology and Reproductive Toxicology, Barra do Garças-MT 78605-091, Brazil
| | - Sonia M Freitas
- Universidade de Brasilia, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Laboratório de Biofisica Molecular, Brasilia-DF 70910-900, Brazil
| | - Maria A G Soler
- Universidade de Brasilia, Instituto de Física, Laboratório de Nanofilmes e Nano Dispositivos, Brasilia-DF 70910-900, Brazil
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Ramirez PD, Lee C, Fedderwitz R, Clavijo AR, Barbosa DPP, Julliot M, Vaz-Ramos J, Begin D, Le Calvé S, Zaloszyc A, Choquet P, Soler MAG, Mertz D, Kofinas P, Piao Y, Begin-Colin S. Phosphate Capture Enhancement Using Designed Iron Oxide-Based Nanostructures. Nanomaterials (Basel) 2023; 13:587. [PMID: 36770547 PMCID: PMC9921849 DOI: 10.3390/nano13030587] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/20/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
Phosphates in high concentrations are harmful pollutants for the environment, and new and cheap solutions are currently needed for phosphate removal from polluted liquid media. Iron oxide nanoparticles show a promising capacity for removing phosphates from polluted media and can be easily separated from polluted media under an external magnetic field. However, they have to display a high surface area allowing high removal pollutant capacity while preserving their magnetic properties. In that context, the reproducible synthesis of magnetic iron oxide raspberry-shaped nanostructures (RSNs) by a modified polyol solvothermal method has been optimized, and the conditions to dope the latter with cobalt, zinc, and aluminum to improve the phosphate adsorption have been determined. These RSNs consist of oriented aggregates of iron oxide nanocrystals, providing a very high saturation magnetization and a superparamagnetic behavior that favor colloidal stability. Finally, the adsorption of phosphates as a function of pH, time, and phosphate concentration has been studied. The undoped and especially aluminum-doped RSNs were demonstrated to be very effective phosphate adsorbents, and they can be extracted from the media by applying a magnet.
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Affiliation(s)
- Paula Duenas Ramirez
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
| | - Chaedong Lee
- Graduate School of Convergence Science and Technology, Seoul National University, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-Si 16229, Gyeonggi-do, Republic of Korea
| | - Rebecca Fedderwitz
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20740, USA
| | | | | | - Maxime Julliot
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
| | - Joana Vaz-Ramos
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Dominique Begin
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Stéphane Le Calvé
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Ariane Zaloszyc
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Philippe Choquet
- Laboratoire des Sciences de l’Ingénieur, de l’Informatique et de l’Imagerie (ICube)—CNRS/University of Strasbourg, UMR 7357 Preclinical Imaging Lab, Imaging Dpt, Hôpitaux Universitaires de Strasbourg, 67098 Strasbourg, France
| | - Maria A. G. Soler
- Institute of Physics, University of Brasilia, Brasilia 70910900, Brazil
| | - Damien Mertz
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20740, USA
| | - Yuanzhe Piao
- Graduate School of Convergence Science and Technology, Seoul National University, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-Si 16229, Gyeonggi-do, Republic of Korea
- Advanced Institutes of Convergence Technology, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-si 16229, Gyeonggi-do, Republic of Korea
| | - Sylvie Begin-Colin
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
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Afiune LAF, Ushirobira CY, Barbosa DPP, de Souza PEN, Leles MIG, Cunha-Filho M, Gelfuso GM, Soler MAG, Gratieri T. Novel iron oxide nanocarriers loading finasteride or dutasteride: Enhanced skin penetration for topical treatment of alopecia. Int J Pharm 2020; 587:119709. [PMID: 32739394 DOI: 10.1016/j.ijpharm.2020.119709] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/08/2020] [Accepted: 07/27/2020] [Indexed: 12/11/2022]
Abstract
In the present study, iron oxide nanoparticles, in the form of maghemite core coated with lauric acid (ION), were synthesized and loaded with finasteride (FIN) or dutasteride (DUT) as a novel drug delivery system for the topical treatment of alopecia. Additionally, developed formulations (FIN-ION and DUT-ION) were completely elaborated with components involved in the follicle metabolism, i.e., lauric acid, which acts as a 5α-reductase inhibitor, and iron which deficiency has been related to hair loss aggravation. Stability assessment conducted over the course of 90 days showed they are highly stable, with pH 7.4, constant EE% (>99%), and practically unchanged particle size and zeta potential. Besides drug distribution, the actual number of iron oxide nanoparticles, through a newly developed method using ferromagnetic resonance, was determined in each skin layer following permeation experiments. Despite the same donor concentration of colloids, nanoparticle distribution in the skin varied according to the loaded molecule. While DUT did not interfere with the nanoparticle natural tendency to accumulate within the hair follicle shafts, FIN presence hampered nanosystem interaction with the skin. Still, both formulations provided a higher skin drug penetration, compared to each respective control solution. Additionally, iron nanocarriers present a desirable visual characteristic, as the dark color aspect might instantly help disguise scarce hair follicle areas. These findings suggest the nanoformulations are highly promising for alopecia therapies.
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Affiliation(s)
- Luana A F Afiune
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), School of Health Sciences, University of Brasília, 70910-900 Brasilia, DF, Brazil; Nanofilms and Nano Devices Laboratory, Institute of Physics, University of Brasília, 70910-900 Brasília, DF, Brazil
| | - Camila Y Ushirobira
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), School of Health Sciences, University of Brasília, 70910-900 Brasilia, DF, Brazil
| | - Débora P P Barbosa
- Nanofilms and Nano Devices Laboratory, Institute of Physics, University of Brasília, 70910-900 Brasília, DF, Brazil
| | - Paulo E N de Souza
- Laboratory of Electron Paramagnetic Resonance, Institute of Physics, University of Brasília, 70910-900 Brasilia, DF, Brazil
| | - Maria I G Leles
- Institute of Chemistry, Federal University of Goias, 74690-900 Goiânia, GO, Brazil
| | - Marcilio Cunha-Filho
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), School of Health Sciences, University of Brasília, 70910-900 Brasilia, DF, Brazil
| | - Guilherme M Gelfuso
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), School of Health Sciences, University of Brasília, 70910-900 Brasilia, DF, Brazil
| | - Maria A G Soler
- Nanofilms and Nano Devices Laboratory, Institute of Physics, University of Brasília, 70910-900 Brasília, DF, Brazil
| | - Tais Gratieri
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), School of Health Sciences, University of Brasília, 70910-900 Brasilia, DF, Brazil.
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Ribeiro EB, de Marchi PGF, Honorio-França AC, França EL, Soler MAG. Interferon-gamma carrying nanoemulsion with immunomodulatory and anti-tumor activities. J Biomed Mater Res A 2019; 108:234-245. [PMID: 31587469 DOI: 10.1002/jbm.a.36808] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 09/14/2019] [Accepted: 09/16/2019] [Indexed: 12/20/2022]
Abstract
The therapeutic administration of cytokines has been introduced aiming to modulate the immune response system, seeking for different approaches to face pathologies such as cancer, auto immune and infectious diseases. The objective of this study was to investigate the effects of a stable oil-in-water (O/W) nanoemulsion system carrying the cytokine Interferon gamma (IFN-γ) on the activity of phagocytes and MCF-7 human breast cancer cells. Nanoemulsions were prepared through ultra-homogenization, and they consisted of distilled water, triglycerides of capric acid/caprylic, sorbitan-oleate, polysorbate 80, and 1-butanol. IFN-γ (100 ng ml-1 ) was incorporated into two O/W nanoemulsion formulations, and these formulations were characterized in terms of their preliminary and accelerated physicochemical stability, rheological properties, droplet size, polydispersity and surface charge. We identified the most optimal IFN-γ nanoemulsion (IFN-γNE2), which remained stable under extreme temperature variations for 90 days, contained an average dose of 97 ng ml-1 of IFN-γ and exhibited a biocompatible pH and a relative stable rheological profile. Cell viability and intracellular Ca2+ release assays conducted showed that IFN-γNE2 reduced the cell viability of MCF-7 cells without affecting the cell viability of phagocytes. Furthermore, IFN-γNE2 was able to induce cellular activity of phagocytes as evidenced by increased intracellular Ca2+ release in these cells. Our findings on this IFN-γ nanoemulsion suggest that it can be a promising therapeutic agent for immunostimulation and cancer treatment.
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Affiliation(s)
- Elton B Ribeiro
- Institute of Physics, University of Brasilia, Brasilia-DF, Brazil.,Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - Patricia G F de Marchi
- Institute of Biological and Health Science, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Adenilda C Honorio-França
- Institute of Biological and Health Science, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Eduardo L França
- Institute of Biological and Health Science, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Maria A G Soler
- Institute of Physics, University of Brasilia, Brasilia-DF, Brazil
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Mosiniewicz-Szablewska E, Clavijo AR, Castilho APOR, Paterno LG, Pereira-da-Silva MA, Więckowski J, Soler MAG, Morais PC. Magnetic studies of layer-by-layer assembled polyvinyl alcohol/iron oxide nanofilms. Phys Chem Chem Phys 2018; 20:26696-26709. [DOI: 10.1039/c8cp05404e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The importance of the substrate surface effects on the magnetic behavior of layer-by-layer assembled polyvinyl alcohol/iron oxide nanofilms is evidenced.
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Affiliation(s)
| | | | | | | | | | | | - Maria A. G. Soler
- Universidade de Brasília
- Instituto de Física
- Brasília DF 70910-900
- Brazil
| | - Paulo C. Morais
- Universidade de Brasília
- Instituto de Física
- Brasília DF 70910-900
- Brazil
- Universidade Católica de Brasília
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B. Ribeiro E, C. Honorio-França A, L. França E, A. G. Soler M. Design and Development of Nanoemulsion Systems Containing Interferon Gamma. Protein Pept Lett 2016; 23:626-38. [DOI: 10.2174/0929866523666160502155249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 04/27/2016] [Accepted: 04/29/2016] [Indexed: 11/22/2022]
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Santos JGM, Souza JR, Letti CJ, Soler MAG, Morais PC, Pereira-da-Silva MA, Paterno LG. Iron oxide nanostructured electrodes for detection of copper(II) ions. J Nanosci Nanotechnol 2014; 14:6614-6623. [PMID: 25924307 DOI: 10.1166/jnn.2014.9379] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Iron oxide nanostructured (ION) electrodes were assembled layer-by-layer onto ITO-coated glass substrates and their structure, morphology, and electrochemical properties were investigated, the latter aiming at the development of a chemical sensor for Cu2+. The electrodes were built by immersing the substrate alternately into an aqueous colloidal suspension of positively charged magnetite nanoparticles (np-Fe3O4, 8 nm) and an aqueous solution of anionic sodium sulfonated polystyrene (PSS). The adsorbed amount of both materials was monitored ex-situ by UV-vis spectroscopy and it was found to increase linearly with the number of deposition cycles. The resulting films feature a densely-packed structure of magnetite nanoparticles, as suggested by AFM and Raman spectroscopy, respectively. Cyclic voltammograms of electrodes immersed in acetate buffer (pH 4.6) displayed three electrochemical events that were tentatively ascribed to the reduction of Fe(III) oxy-hydroxide to magnetite, reduction of maghemite to magnetite, and finally oxidation of magnetite to maghemite. The effect of np-Fe3O4/PSS bilayers on the ION electrode performance was to increase the anodic and cathodic currents produced during electrochemical oxidation-reduction of the Fe(CN)(3-/4-) redox couple. With more bilayers, the ION electrode provided higher anodic/cathodic currents. Moreover, the redox couple exhibited a quasi-reversible behavior at the ION electrode as already observed with other working electrode systems. Fitting of voltammetry data provided the apparent electron transfer constants, which were found to be higher in ION electrodes for both redox couples (Fe(CN)(3-/4-) and Cu(2+/0)). By means of differential pulsed anodic stripping voltammetry, the ION electrodes were found to respond linearly to the presence of Cu2+ in aqueous samples in the range between 1.0 and 8.0 x 10(-6) mol x L(-1) and displayed a limit of detection of 0.3 x 10(-8) mol x L(-1). The sensitivity was - 0.6μA/μmol x L(-1). In standard addition and recovery experiments performed with tap water the recovery was about 102%-119%. In similar experiments conducted with ground and instant coffee samples the recovery was 92.5% and 103%, respectively. Furthermore, the ION electrodes were almost insensitive to the presence of common interfering ions, such as Zn2+, Mn2+, Ni2+, and Fe3+, even at concentrations ten times higher than that of Cu2+.
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Gross MA, Sales MJA, Soler MAG, Pereira-da-Silva MA, da Silva MFP, Paterno LG. Reduced graphene oxide multilayers for gas and liquid phases chemical sensing. RSC Adv 2014. [DOI: 10.1039/c4ra01469c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Alcantara GB, Paterno LG, Fonseca FJ, Pereira-da-Silva MA, Morais PC, Soler MAG. Dielectric properties of cobalt ferrite nanoparticles in ultrathin nanocomposite films. Phys Chem Chem Phys 2013; 15:19853-61. [DOI: 10.1039/c3cp53602e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Paterno LG, Sinnecker EHCP, Soler MAG, Sinnecker JP, Novak MA, Morais PC. Tuning of magnetic dipolar interactions of maghemite nanoparticles embedded in polyelectrolyte layer-by-layer films. J Nanosci Nanotechnol 2012; 12:6672-6678. [PMID: 22962805 DOI: 10.1166/jnn.2012.4554] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this study we report an experimental approach capable of tuning dipolar interactions in hybrid magnetic nanofilms produced via layer-by-layer assembly of positively-charged maghemite nanoparticles and sodium sulfonated polystyrene onto glass and silicon substrates. Morphological and magnetic properties of the as prepared nanofilms were determined by Raman spectroscopy, atomic force microscopy, conventional and SQUID magnetometry. Maghemite nanoparticles form densely packed layers with voids between particles being filled by polymeric material as observed in atomic force microscopy images. Magnetic hysteresis loops and zero-field-cooled/field-cooled magnetization curves reveal a superparamagnetic behavior at room temperature. The energy barrier for the magnetic moment reversal of the nanofilms has been determined from the frequency dependent ac susceptibility and is related to the gamma-Fe2O3 nanoparticles concentration used in the colloidal dispersion throughout film fabrication. Variations on the interparticle distances have a direct effect on the interparticle dipolar interactions. A less concentrated colloid gives rise to large separated nanoparticles inside the nanofilm with a consequent reduction on the energy barrier for the magnetic moment reversal. The fabrication process exploring the control of the nanoparticle concentration can thus be used to tune the magnetic dipolar interactions in the nanofilms.
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Affiliation(s)
- Leonardo G Paterno
- Universidade de Brasília, Instituto de Física, 70910-900 Brasília-DF, Brazil
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Soler MAG, Lima ECD, Nunes ES, Silva FLR, Oliveira AC, Azevedo RB, Morais PC. Spectroscopic study of maghemite nanoparticles surface-grafted with DMSA. J Phys Chem A 2011; 115:1003-8. [PMID: 21261312 DOI: 10.1021/jp1109916] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nanosized maghemite (below 10 nm average diameter), surface-functionalized with meso-2,3-dimercaptosuccinic acid (DMSA), was investigated with respect to the content of DMSA molecules attached onto its surface and the onset of S-S bridges due to oxidation of neighboring S-H groups. To support our investigation, we introduced the use of photoacoustic spectroscopy to monitor thiol groups (S-H) conjugated with Raman spectroscopy to monitor the disulfide bridges (S-S). The normalized intensity (N(R)) of the Raman feature peaking at 500 cm(-1) was used to probe the S-S bridge whereas the normalized intensity (N(P)) of the photoacoustic band-S (0.42-0.65 μm) was used to probe the S-H moiety. The perfect linearity observed in the N(R) versus (1 - N(P)) plot strongly supports the oxidation process involving neighboring S-H groups as the DMSA surface grafting coefficient increases whereas the approach used in this report allows the evaluation of the [S-H]/[S-S] ratio. The observation of the reduction of the hydrodynamic diameter as the nominal DMSA-grafting increases supports the proposed model picture, in which the intraparticle (interparticle) S-S bridging takes place at higher (lower) DMSA-grafting values.
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Affiliation(s)
- Maria A G Soler
- Instituto de Física, Universidade de Brasília, Brasília DF, Brazil
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Alcantara GB, Paterno LG, Afonso AS, Faria RC, Pereira-da-Silva MA, Morais PC, Soler MAG. Adsorption of cobalt ferrite nanoparticles within layer-by-layer films: a kinetic study carried out using quartz crystal microbalance. Phys Chem Chem Phys 2011; 13:21233-42. [DOI: 10.1039/c1cp22693b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Paterno LG, Soler MAG, Fonseca FJ, Sinnecker JP, Sinnecker EHCP, Lima ECD, Báo SN, Novak MA, Morais PC. Magnetic nanocomposites fabricated via the layer-by-layer approach. J Nanosci Nanotechnol 2010; 10:2679-2685. [PMID: 20355484 DOI: 10.1166/jnn.2010.1411] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this study we describe the fabrication and characterization of nanocomposites consisting of layer-by-layer assembled polyaniline, sulfonated polystyrene, and maghemite nanoparticle layers. In order to assemble the starting components via electrostatic interaction, stable magnetic fluid containing maghemite nanoparticles (d approximately = 7 nm) with either positive or negative surface charges was used as source of nanoparticles for the layer-by-layer assembly. The structure, morphology, electrical and magnetic properties of such nanocomposite films were investigated by UV-Vis spectroscopy, atomic force microscopy, electrical, and magnetic measurements. The amount of PANI, PSS and maghemite nanoparticles within the nanocomposite films increased almost linearly with the number of deposited layers. Atomic force microscopy image of typical polyaniline/maghemite nanocomposites reveal nanoparticles adsorbed all over the film surface. The as-produced nanocomposite exhibits electrical conductivity and superparamagnetism behavior at room temperature, the latter confirmed by the absence of magnetic hysteresis.
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Affiliation(s)
- Leonardo G Paterno
- Depto de Engenharia de Sistemas Eletrônicos, EPUSP, 05508-900 São Paulo-SFP Brazil
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Soler MAG, Lima ECD, da Silva SW, Melo TFO, Pimenta ACM, Sinnecker JP, Azevedo RB, Garg VK, Oliveira AC, Novak MA, Morais PC. Aging investigation of cobalt ferrite nanoparticles in low pH magnetic fluid. Langmuir 2007; 23:9611-7. [PMID: 17696556 DOI: 10.1021/la701358g] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
In this study, we report on how surface-passivated and nonpassivated cobalt ferrite nanoparticles (8 nm diameter), suspended as ionic magnetic fluids and aged under low pH conditions, revealed different behavior as far as the time evolution of the iron/cobalt cation distribution, crystal quality, coercivity, and saturation magnetization are concerned. Different techniques were used to perform a detailed study regarding the chemical stability, structural stability, and surface and magnetic properties of the suspended nanoparticles as a function of the aging time. Properties of surface-passivated and nonpassivated nanoparticles were investigated by transmission electron microscopy, X-ray diffraction, atomic absorption spectrometry, magnetic measurements, Raman spectroscopy, and Mössbauer spectroscopy. Our data showed that the employed nanoparticle surface passivation process, besides the formation of an iron-rich surface layer, modifies the nanoparticle core as well, improving the crystal quality while modifying the Fe/Co cation distribution and the nanoparticle dissolution rate profile. Magnetic data showed that the saturation magnetization increases for surface-passivated nanoparticles in comparison to the nonpassivated ones, though coercivity decreases after passivation. These two observations were associated to changes in the cation distribution among the available tetrahedral and octahedral sites.
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Affiliation(s)
- Maria A G Soler
- Instituto de Física, Universidade de Brasília, Brasília DF 70910-900, Brazil.
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Soler MAG, Báo SN, Alcântara GB, Tibúrcio VHS, Paludo GR, Santana JFB, Guedes MH, Lima ECD, Lacava ZGM, Morais PC. Interaction of erythrocytes with magnetic nanoparticles. J Nanosci Nanotechnol 2007; 7:1069-71. [PMID: 17450877 DOI: 10.1166/jnn.2007.423] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Internalization of biocompatible magnetic nanoparticles by red blood cells (RBCs) is a key issue for opportunities of new applications in the biomedical field. In this study, we used in vitro tests to provide evidences of magnetic nanoparticle internalization by mice red blood cells. The internalization process depends upon the nanoparticle concentration and the nanoparticle hydrodynamic radii. The cell internalization of surface-coated maghemite nanoparticles was indirectly tracked by Raman spectroscopy and directly observed using transmission electron microscopy. The observation of nanoparticle cell uptaking using in vitro experiments represents an important breakthrough for the application of nanomagnetism in diagnosis and therapy of RBC-related diseases.
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Affiliation(s)
- Maria A G Soler
- Instituto de Fisica, Universidade de Brasilia, Brasilia-DF 70910-900, Brazil
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