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Martín-Roca J, Horcajo-Fernández M, Valeriani C, Gámez F, Martínez-Pedrero F. Field-Pulse-Induced Annealing of 2D Colloidal Polycrystals. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:397. [PMID: 36770358 PMCID: PMC9921439 DOI: 10.3390/nano13030397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/13/2023] [Accepted: 01/16/2023] [Indexed: 06/18/2023]
Abstract
Two-dimensional colloidal crystals are of considerable fundamental and practical importance. However, their quality is often low due to the widespread presence of domain walls and defects. In this work, we explored the annealing process undergone by monolayers of superparamagnetic colloids adsorbed onto fluid interfaces in the presence of magnetic field pulses. These systems present the extraordinary peculiarity that both the extent and the character of interparticle interactions can be adjusted at will by simply varying the strength and orientation of the applied field so that the application of field pulses results in a sudden input of energy. Specifically, we have studied the effect of polycrystal size, pulse duration, slope and frequency on the efficiency of the annealing process and found that (i) this strategy is only effective when the polycrystal consists of less than approximately 10 domains; (ii) that the pulse duration should be of the order of magnitude of the time required for the outer particles to travel one diameter during the heating step; (iii) that the quality of larger polycrystals can be slightly improved by applying tilted pulses. The experimental results were corroborated by Brownian dynamics simulations.
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Affiliation(s)
- José Martín-Roca
- Departamento de Estructura de la Materia, Física Térmica y Electrónica, Universidad Complutense de Madrid, 28040 Madrid, Spain
- GISC-Grupo Interdisciplinar de Sistemas Complejos, 28040 Madrid, Spain
| | | | - Chantal Valeriani
- Departamento de Estructura de la Materia, Física Térmica y Electrónica, Universidad Complutense de Madrid, 28040 Madrid, Spain
- GISC-Grupo Interdisciplinar de Sistemas Complejos, 28040 Madrid, Spain
| | - Francisco Gámez
- Departamento de Química-Física, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Lyu Z, Ghoshdastidar S, Rekha KR, Suresh D, Mao J, Bivens N, Kannan R, Joshi T, Rosenfeld CS, Upendran A. Developmental exposure to silver nanoparticles leads to long term gut dysbiosis and neurobehavioral alterations. Sci Rep 2021; 11:6558. [PMID: 33753813 PMCID: PMC7985313 DOI: 10.1038/s41598-021-85919-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 02/25/2021] [Indexed: 12/13/2022] Open
Abstract
Due to their antimicrobial properties, silver nanoparticles (AgNPs) are used in a wide range of consumer products that includes topical wound dressings, coatings for biomedical devices, and food-packaging to extend the shelf-life. Despite their beneficial antimicrobial effects, developmental exposure to such AgNPs may lead to gut dysbiosis and long-term health consequences in exposed offspring. AgNPs can cross the placenta and blood–brain-barrier to translocate in the brain of offspring. The underlying hypothesis tested in the current study was that developmental exposure of male and female mice to AgNPs disrupts the microbiome–gut–brain axis. To examine for such effects, C57BL6 female mice were exposed orally to AgNPs at a dose of 3 mg/kg BW or vehicle control 2 weeks prior to breeding and throughout gestation. Male and female offspring were tested in various mazes that measure different behavioral domains, and the gut microbial profiles were surveyed from 30 through 120 days of age. Our study results suggest that developmental exposure results in increased likelihood of engaging in repetitive behaviors and reductions in resident microglial cells. Echo-MRI results indicate increased body fat in offspring exposed to AgNPs exhibit. Coprobacillus spp., Mucispirillum spp., and Bifidobacterium spp. were reduced, while Prevotella spp., Bacillus spp., Planococcaceae, Staphylococcus spp., Enterococcus spp., and Ruminococcus spp. were increased in those developmentally exposed to NPs. These bacterial changes were linked to behavioral and metabolic alterations. In conclusion, developmental exposure of AgNPs results in long term gut dysbiosis, body fat increase and neurobehavioral alterations in offspring.
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Affiliation(s)
- Zhen Lyu
- Department of Electrical Engineering and Computer Science, University of Missouri, Columbia, MO, 65212, USA
| | - Shreya Ghoshdastidar
- Department of Biomedical, Biological and Chemical Engineering, University of Missouri, Columbia, MO, 65211, USA
| | - Karamkolly R Rekha
- Department of Radiology, University of Missouri, Columbia, MO, 65212, USA
| | - Dhananjay Suresh
- Department of Biomedical, Biological and Chemical Engineering, University of Missouri, Columbia, MO, 65211, USA
| | - Jiude Mao
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, 65212, USA.,MU Institute of Data Science and Informatics, University of Missouri, Columbia, MO, 65212, USA
| | - Nathan Bivens
- DNA Core Facility, University of Missouri, Columbia, MO, 65212, USA
| | - Raghuraman Kannan
- Department of Biomedical, Biological and Chemical Engineering, University of Missouri, Columbia, MO, 65211, USA.,Department of Radiology, University of Missouri, Columbia, MO, 65212, USA
| | - Trupti Joshi
- Department of Electrical Engineering and Computer Science, University of Missouri, Columbia, MO, 65212, USA. .,Department of Health Management and Informatics, University of Missouri, Columbia, MO, 65212, USA. .,MU Institute of Data Science and Informatics, University of Missouri, Columbia, MO, 65212, USA. .,Bond Life Sciences Center, University of Missouri, Columbia, MO, 65212, USA.
| | - Cheryl S Rosenfeld
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, 65212, USA. .,MU Institute of Data Science and Informatics, University of Missouri, Columbia, MO, 65212, USA. .,Bond Life Sciences Center, University of Missouri, Columbia, MO, 65212, USA. .,Genetics Area Program, University of Missouri, Columbia, MO, 65212, USA. .,Thompson Center for Autism and Neurobehavioral Disorders, University of Missouri, Columbia, MO, 65212, USA. .,Department of Medical Pharmacology & Physiology, University of Missouri, Columbia, MO, 65212, USA.
| | - Anandhi Upendran
- Department of Medical Pharmacology & Physiology, University of Missouri, Columbia, MO, 65212, USA. .,MU-Institute of Clinical and Translational Science, University of Missouri, Columbia, MO, 65212, USA.
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Xu B, Ye F, Chang G, Li R. A Simple and Cost-Effective Method for Producing Stable Surfactant-Coated EGaIn Liquid Metal Nanodroplets. MATERIALS 2020; 13:ma13173753. [PMID: 32854305 PMCID: PMC7503906 DOI: 10.3390/ma13173753] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/17/2020] [Accepted: 08/19/2020] [Indexed: 11/16/2022]
Abstract
Liquid metals show unparalleled advantages in printable circuits, flexible wear, drug carriers, and electromagnetic shielding. However, the efficient and large-scale preparation of liquid metal nanodroplets (LM NDs) remains a significant challenge. Here, we propose a simple and efficient method for the large-scale preparation of stable eutectic gallium indium nanodroplets (EGaIn NDs). We compared different preparation methods and found that droplets with smaller particle sizes could quickly be produced using a shaking technique. The size of EGaIn NDs produced using this technique can reach 200 nm in 30 min and 100 nm in 240 min. Benefiting from the simple method, various surfactants can directly modify the surface of the EGaIn NDs to stabilize the prepared droplets. In addition, we discovered that shaking in an ice bath produced spherical nanodroplets, and after shaking for 30 min in a non-ice bath, rod-shaped gallium oxide hydroxide (GaOOH) appeared. Furthermore, the EGaIn NDs we produced have excellent stability-after storage at room temperature for 30 days, the particle size and morphology change little. The excellent stability of the produced EGaIn NDs provides a wider application of liquid metals in the fields of drug delivery, electromagnetic shielding, conductive inks, printed circuits, etc.
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