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Ruderman A, Oviedo MB, Paz SA, Leiva EPM. Diversity of Behavior after Collisions of Sn and Si Nanoparticles Found Using a New Density Functional Tight-Binding Method. J Phys Chem A 2023; 127:8955-8965. [PMID: 37831543 DOI: 10.1021/acs.jpca.3c05534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2023]
Abstract
We present a new approach to studying nanoparticle collisions using density functional based tight binding (DFTB). A novel DFTB parametrization has been developed to study the collision process of Sn and Si clusters (NPs) using molecular dynamics (MD). While bulk structures were used as training sets, we show that our model is able to accurately reproduce the cohesive energy of the nanoparticles using density functional theory (DFT) as a reference. A surprising variety of phenomena are revealed for the Si/Sn nanoparticle collisions, depending on the size and velocity of the collision: from core-shell structure formation to bounce-off phenomena.
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Affiliation(s)
- Andrés Ruderman
- Facultad de Matemática, Astronomía Física y Computación, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Consejo Nacional de Investigaciones Cientıficas y Técnicas (CONICET), Instituto de Física Enrique Gaviola (IFEG), Córdoba X5000HUA, Argentina
| | - María Belén Oviedo
- Facultad de Ciencias Quımicas, Departamento de Quımica Teórica y Computacional, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Consejo Nacional de Investigaciones Cientıficas y Técnicas (CONICET), Instituto de Fisicoquımica de Córdoba (INFIQC), Córdoba X5000HUA, Argentina
| | - Sergio Alexis Paz
- Facultad de Ciencias Quımicas, Departamento de Quımica Teórica y Computacional, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Consejo Nacional de Investigaciones Cientıficas y Técnicas (CONICET), Instituto de Fisicoquımica de Córdoba (INFIQC), Córdoba X5000HUA, Argentina
| | - Ezequiel P M Leiva
- Facultad de Ciencias Quımicas, Departamento de Quımica Teórica y Computacional, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Consejo Nacional de Investigaciones Cientıficas y Técnicas (CONICET), Instituto de Fisicoquımica de Córdoba (INFIQC), Córdoba X5000HUA, Argentina
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Alginate-Derivative Encapsulated Carbon Coated Manganese-Ferrite Nanodots for Multimodal Medical Imaging. Pharmaceutics 2022; 14:pharmaceutics14122550. [PMID: 36559045 PMCID: PMC9782169 DOI: 10.3390/pharmaceutics14122550] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/16/2022] [Accepted: 11/20/2022] [Indexed: 11/23/2022] Open
Abstract
Carbon-decorated ferrite nanodots (MNF@Cs) have been enhanced with superparamagnetism and higher fluorescence quantum yield by encapsulation with an alginate derivative to create a cost-effective and less toxic multimodal contrast agent for replacing the conventional heavy metal Gd-containing contrast agent used in MR imaging. The novel surface-engineered particles (MNF@C-OSAs), devoid of labels, can simultaneously provide both longitudinal and transverse relaxation-based magnetic resonance imaging (MRI) and fluorescence emission. According to the findings of in vitro studies, the calculated molar relaxivities and the molar radiant efficiencies are indicative of the multimodal efficacy of MNF@C-OSA as compared with MNF@C particles and conventional contrast agents used in medical imaging. MNF@C-OSAs were shown to be significantly biocompatible and negligibly toxic when assessed against A549 cells and zebrafish embryos, indicating their potential for use as theranostic agents.
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Farkaš B, de Leeuw NH. AuCo nanoparticles: ordering, magnetisation, and morphology trends predicted by DFT. Phys Chem Chem Phys 2022; 24:10451-10464. [PMID: 35441635 DOI: 10.1039/d2cp00648k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rapid development of applications relying on magnetism at the nanoscale has put a spotlight on nanoparticles with novel morphologies that are associated with enhanced electronic and magnetic properties. In this quest, nanoalloys combining highly magnetic cobalt and weakly reactive gold could offer many application-specific advantages, such as strong magnetic anisotropy. In the present study, we have employed density functional theory (DFT) calculations to provide a systematic overview of the size- and morphology-dependence of the energetic order and magnetic properties of AuCo nanoparticles up to 2.5 nm in diameter. The core-shell icosahedron was captured as the most favourable morphology, showing a small preference over the core-shell decahedron. However, the magnetic properties (total magnetic moments and magnetic anisotropy) were found to be significantly improved within the L10 ordered structures, even in comparison to monometallic Co nanoparticles. Atom-resolved charges and orbital moments accessed through the DFT analysis of the electronic level properties permitted insight into the close interrelation between the AuCo nanoparticle morphology and their magnetism. These results are expected to assist in the design of tailored magnetic AuCo nanoalloys for specific applications.
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Affiliation(s)
- Barbara Farkaš
- School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK.
| | - Nora H de Leeuw
- School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK. .,School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
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High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H2 Reduction of Co-Ferrites. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12041899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cobalt ferrite nanoparticles of different stoichiometries synthesized by a sol–gel autocombustion method were used as a starting material to obtain high-moment Fe50Co50 and Fe66Co34 metal nanoparticles by topochemical hydrogen reduction. Structural and magnetic investigations confirmed the formation of FeCo nanoparticles with crystallite sizes of about 30 nm and magnetization at 0.5 T of ~265 Am2/kg (0 K), which was larger than the expected bulk value, likely because of the incorporation in the body-centered cubic (bcc) FeCo structure of the residual C atoms present on the surface of the oxide particles. Temperature-dependent magnetization measurements in the H2 atmosphere were also performed to investigate in detail the reduction mechanism and the effect of an external magnetic field on the process efficiency.
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Florkiewicz W, Pluta K, Malina D, Rudnicka K, Żywicka A, Guigou MD, Tyliszczak B, Sobczak-Kupiec A. Investigation on Green Synthesis, Biocompatibility, and Antibacterial Activity of Silver Nanoparticles Prepared Using Cistus incanus. MATERIALS 2021; 14:ma14175028. [PMID: 34501114 PMCID: PMC8433835 DOI: 10.3390/ma14175028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 08/26/2021] [Accepted: 08/28/2021] [Indexed: 12/23/2022]
Abstract
This paper describes the plant-mediated preparation of silver nanoparticles with aqueous extract and infusion of Cistus incanus leaves. To evaluate aqueous extract and infusion antioxidant capacity and total phenolic content the DPPH and Folin-Ciocalteau methods were utilized. The antioxidant capacity and total phenolic content of extract and infusion were equal to 85.97 ± 6.54 mg gallic acid equivalents per gram of dry weight.; 10.76 ± 0.59 mg/mL and 12.65 ± 1.04 mg gallic acid equivalents per gram of dry weight.; 3.10 ± 0.14 mg/mL, respectively. The formed nanoparticles displayed the characteristic absorption band in the 380-450 nm wavelength range. The average size of particles was in the 68.8-71.2 nm range. Morphology and phase composition analysis revealed the formation of spherical nanoparticles with a face-centred cubic structure. Immune compatibility tests of nanoparticles and plant extracts showed no activation of the THP1-XBlue™ monocyte. Cytotoxicity tests performed with L929 mice fibroblasts showed that nanoparticles should be utilized at a concentration of 16 ppm. The minimum inhibitory concentrations determined with the microdilution method for nanoparticles prepared with plant infusion for S. aureus and S. epidermidis were 2 ppm and 16 ppm, respectively.
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Affiliation(s)
- Wioletta Florkiewicz
- Department of Materials Science, Faculty of Materials Engineering and Physics, Cracow University of Technology, 37 Jana Pawła II Av., 31-864 Krakow, Poland; (B.T.); (A.S.-K.)
- Correspondence:
| | - Klaudia Pluta
- Department of Chemical Technology and Environmental Analytics, Cracow University of Technology, 24 Warszawska St., 31-155 Krakow, Poland; (K.P.); (D.M.)
| | - Dagmara Malina
- Department of Chemical Technology and Environmental Analytics, Cracow University of Technology, 24 Warszawska St., 31-155 Krakow, Poland; (K.P.); (D.M.)
| | - Karolina Rudnicka
- Department of Immunology and Infectious Biology, Faculty of Biology and Environmental Protection, University of Lodz, 12/16 Banacha St., 90-237 Lodz, Poland;
| | - Anna Żywicka
- Department of Microbiology and Biotechnology, Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology, Szczecin, Piastów 45, 70-311 Szczecin, Poland;
| | - Martin Duarte Guigou
- Facultad de Ingeniería y Tecnologías, Universidad Católica del Uruguay, B de Octubre 2738, Montevideo CP 11600, Uruguay;
| | - Bożena Tyliszczak
- Department of Materials Science, Faculty of Materials Engineering and Physics, Cracow University of Technology, 37 Jana Pawła II Av., 31-864 Krakow, Poland; (B.T.); (A.S.-K.)
| | - Agnieszka Sobczak-Kupiec
- Department of Materials Science, Faculty of Materials Engineering and Physics, Cracow University of Technology, 37 Jana Pawła II Av., 31-864 Krakow, Poland; (B.T.); (A.S.-K.)
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