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20 results on '"Villalva, Julia"'

1. Mechanical and liquid phase exfoliation of cylindrite: a natural van der Waals superlattice with intrinsic magnetic interactions

Author

Niu, Yue, Villalva, Julia, Frisenda, Riccardo, Sanchez-Santolino, Gabriel, Ruiz-González, Luisa, Pérez, Emilio M., García-Hernández, Mar, Burzurí, Enrique, and Castellanos-Gomez, Andres

Subjects
Physics - Applied Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

We report the isolation of thin flakes of cylindrite, a naturally occurring van der Waals superlattice, by means of mechanical and liquid phase exfoliation. We find that this material is a heavily doped p-type semiconductor with a narrow gap (<0.85 eV) with intrinsic magnetic interactions that are preserved even in the exfoliated nanosheets. Due to its environmental stability and high electrical conductivity, cylindrite can be an interesting alternative to the existing two-dimensional magnetic materials., Comment: 5 figures in main text, 1 supp. info. figure. Available open access at the publisher's web

Published
2019
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2. Simultaneous Assembly of van der Waals Heterostructures into Multiple Nanodevices

Author

Burzurí, Enrique, Vera-Hidalgo, Mariano, Giovanelli, Emerson, Villalva, Julia, Castellanos-Gomez, Andres, and Pérez, Emilio M.

Subjects
Condensed Matter - Materials Science
Abstract

Van der Waals heterostructures (vdWH) are made of different two-dimensional (2D) layers stacked on top of each other, forming a single material with unique properties that differ from those of the individual 2D constituent layers, and that can be modulated through the interlayer interaction. These hetero-materials can be artificially made by mechanical stamping, solution processing or epitaxial growth. Alternatively, franckeite has been recently described as an example of a naturally-occurring vdWH that can be exfoliated down to nanometer thicknesses. Research on vdWHs has so far been limited to manually exfoliated and stamped individual devices. Here, a scalable and fast method to fabricate vdWH nanodevices from liquid phase exfoliated nanoflakes is reported. The transport and positioning of the flakes into localized submicrometer structures is achieved simultaneously in multiple devices via a dielectrophoretic process. The complex vdWH is preserved after dielectrophoresis and the properties of the resulting field-effect transistors are equivalent to those fabricated via mechanical exfoliation and stamping. The combination of liquid phase exfoliation and dielectrophoretic assembly is particularly suited for the study of vdWHs and applications where large-scale fabrication is required.

Published
2018
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4. Interlocking Matrix and Filler for Enhanced Individualization and Reinforcement in Polymer–Single-Walled Carbon Nanotube Composites

Author

Villalva, Julia, primary, Rapakousiou, Amalia, additional, Monclús, Miguel A., additional, Fernández Blázquez, Juan Pedro, additional, de la Vega, Jimena, additional, Naranjo, Alicia, additional, Vera-Hidalgo, Mariano, additional, Ruiz-González, María Luisa, additional, Pedersen, Henrik, additional, and Pérez, Emilio M., additional

Published
2023
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7. Pars Plana Vitrectomy with Silicone Oil Tamponade as Primary Treatment of Myopic Foveoschisis with High Risk for Macular Hole.

Author

Santiago, Patrick A. and C. Villalva, Julia Mercedes

Subjects
*PARS plana, *VITRECTOMY, *SILICONES, *RETINAL detachment, *VISUAL acuity, *PROLIFERATIVE vitreoretinopathy
Abstract

Objective: This small case series demonstrated pars plana vitrectomy and silicone tamponade without internal limiting membrane (ILM) peeling to be a simple, safe, and effective surgical technique for the treatment of myopic traction maculopathy (MTM). Methods: This is a small case series consisting of 3 eyes with MTM. In all eyes, pars plana vitrectomy with silicone oil tamponade was performed by a single vitreoretinal surgeon. Functional and anatomic outcomes are reported. Results: All 3 eyes had improved visual acuity with no noted short-term complications such as iatrogenic macular hole and retinal detachment. Although foveoschisis was only partly anatomically resolved in 2 out of the 3 cases, functional outcome, in terms of visual acuity at last visit, was satisfactory. Conclusion: Vitrectomy with silicone oil tamponade without ILM peeling is a simple, effective, and safe optional surgical technique to treat MTM. [ABSTRACT FROM AUTHOR]

Published
2023

8. Spin-state-dependent electrical conductivity in single-walled carbon nanotubes encapsulating spin-crossover molecules

Author

Universidad de Sevilla. Departamento de Química Física, Marie Skłodowska-Curie Actions (MSCA), Programa de Atracción del Talento Investigador. Comunidad de Madrid, Ministerio de Economia, Industria y Competitividad (MINECO). España, Consejo Europeo de Investigación (ERC), Comunidad Autónoma de Madrid, NANOMAGCOST, Villalva, Julia, Develioglu, Aysegul, Montenegro Pohlhammer, Nicolás, Sánchez de Armas, María Rocío, Gamonal, Arturo, Rial, Eduardo, García Hernández, Mar, Ruiz González, Luisa, Sánchez Costa, José, Jiménez Calzado, María del Carmen, Pérez, Emilio M., Burzuri, Enrique, Universidad de Sevilla. Departamento de Química Física, Marie Skłodowska-Curie Actions (MSCA), Programa de Atracción del Talento Investigador. Comunidad de Madrid, Ministerio de Economia, Industria y Competitividad (MINECO). España, Consejo Europeo de Investigación (ERC), Comunidad Autónoma de Madrid, NANOMAGCOST, Villalva, Julia, Develioglu, Aysegul, Montenegro Pohlhammer, Nicolás, Sánchez de Armas, María Rocío, Gamonal, Arturo, Rial, Eduardo, García Hernández, Mar, Ruiz González, Luisa, Sánchez Costa, José, Jiménez Calzado, María del Carmen, Pérez, Emilio M., and Burzuri, Enrique

Abstract

Spin crossover (SCO) molecules are promising nanoscale magnetic switches due to their ability to modify their spin state under several stimuli. However, SCO systems face several bottlenecks when downscaling into nanoscale spintronic devices: their instability at the nanoscale, their insulating character and the lack of control when positioning nanocrystals in nanodevices. Here we show the encapsulation of robust Fe-based SCO molecules within the 1D cavities of single-walled carbon nanotubes (SWCNT). We find that the SCO mechanism endures encapsulation and positioning of individual heterostructures in nanoscale transistors. The SCO switch in the guest molecules triggers a large conductance bistability through the host SWCNT. Moreover, the SCO transition shifts to higher temperatures and displays hysteresis cycles, and thus memory effect, not present in crystalline samples. Our results demonstrate how encapsulation in SWCNTs provides the backbone for the readout and positioning of SCO molecules into nanodevices, and can also help to tune their magnetic properties at the nanoscale.

Published
2021

9. Covalent Chemistry on a Van Der Waals Heterostructure

Author

Villalva, Julia, primary, Moreno, Sara, primary, Villa, Palmira, primary, González, Luisa R., primary, Navío, Cristina, primary, García-Orrit, Saül, primary, Vega-Mayoral, Víctor, primary, Cabanillas-Gonzalez, Juan, primary, Castellanos-Gomez, Andres, primary, Giovanelli, Emerson, primary, and Pérez, Emilio, primary

Published
2021
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10. Covalent modification of franckeite with maleimides: connecting molecules and van der Waals heterostructures

Author

Villalva, Julia, primary, Moreno-Da Silva, Sara, additional, Villa, Palmira, additional, Ruiz-González, Luisa, additional, Navío, Cristina, additional, Garcia-Orrit, Saül, additional, Vega-Mayoral, Víctor, additional, Cabanillas-González, Juan, additional, Castellanos-Gomez, Andrés, additional, Giovanelli, Emerson, additional, and Pérez, Emilio M., additional

Published
2021
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11. Mechanische Verzahnung von einwandigen Kohlenstoffnanoröhren durch dynamisch‐kovalente Bildung von konkaven Disulfidmakrozyklen

Author

Balakrishna, Bugga, primary, Menon, Arjun, additional, Cao, Kecheng, additional, Gsänger, Sebastian, additional, Beil, Sebastian B., additional, Villalva, Julia, additional, Shyshov, Oleksandr, additional, Martin, Oliver, additional, Hirsch, Andreas, additional, Meyer, Bernd, additional, Kaiser, Ute, additional, Guldi, Dirk M., additional, and Delius, Max, additional

Published
2020
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12. Dynamic Covalent Formation of Concave Disulfide Macrocycles Mechanically Interlocked with Single‐Walled Carbon Nanotubes

Author

Balakrishna, Bugga, primary, Menon, Arjun, additional, Cao, Kecheng, additional, Gsänger, Sebastian, additional, Beil, Sebastian B., additional, Villalva, Julia, additional, Shyshov, Oleksandr, additional, Martin, Oliver, additional, Hirsch, Andreas, additional, Meyer, Bernd, additional, Kaiser, Ute, additional, Guldi, Dirk M., additional, and Delius, Max, additional

Published
2020
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