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Cazorla A, Martín-Martín S, Delgado ÁV, Jiménez ML. Electro-optics of confined systems. J Colloid Interface Sci 2024; 658:52-60. [PMID: 38096679 DOI: 10.1016/j.jcis.2023.11.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 11/13/2023] [Accepted: 11/28/2023] [Indexed: 01/12/2024]
Abstract
Confinement in microenvironments occurs in many natural systems and technological applications. However, little is known about the behaviour of the immersed nanoparticles. In this work we show that their diffusion, electro-orientation and electric field induced polarization can be determined through electric birefringence experiments. We analyze aqueous dispersions of silver nanowires and clay particles confined inside microdroplets. We have observed that confinement reduces the amount of particles that can be oriented by the external electric field. However, the polarizability of the oriented particles is not affected by the presence of the oil/water boundary, and it is the same as in unbounded media, which agrees with the fact that the electric polarization and related phenomena are short-ranged.
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Affiliation(s)
- Ana Cazorla
- Department of Applied Physics, University of Granada, Avda. de Fuente Nueva sn, 18071, Granada, Spain.
| | - Sergio Martín-Martín
- Department of Applied Physics, University of Granada, Avda. de Fuente Nueva sn, 18071, Granada, Spain.
| | - Ángel V Delgado
- Department of Applied Physics, University of Granada, Avda. de Fuente Nueva sn, 18071, Granada, Spain.
| | - María L Jiménez
- Department of Applied Physics, University of Granada, Avda. de Fuente Nueva sn, 18071, Granada, Spain.
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Martín-Martín S, Ramos-Tejada MDM, Rubio-Andrés A, Bonhome-Espinosa AB, Delgado ÁV, Jiménez ML. Electro-optical Study of the Anomalous Rotational Diffusion in Polymer Solutions. Macromolecules 2023; 56:518-527. [PMID: 36711111 PMCID: PMC9879198 DOI: 10.1021/acs.macromol.2c01461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 12/22/2022] [Indexed: 01/13/2023]
Abstract
Brownian diffusion of spherical nanoparticles is usually exploited to ascertain the rheological properties of complex media. However, the behavior of the tracer particles is affected by a number of phenomena linked to the interplay between the dynamics of the particles and polymer coils. For this reason, the characteristic lengths of the dispersed entities, depletion phenomena, and the presence of sticking conditions have been observed to affect the translational diffusion of the probes. On the other hand, the retardation effect of the host fluid on the rotational diffusion of nonspherical particles is less understood. We explore the possibility of studying this phenomenon by analyzing the electro-orientation of the particles in different scenarios in which we vary the ratio between the particle and polymer characteristic size, and the geometry of the particles, including both elongated and oblate shapes. We find that the Stokes-Einstein relation only applies if the radius of gyration of the polymer is much shorter than the particle size and when some repulsive interaction between both is present.
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Affiliation(s)
- Sergio Martín-Martín
- Department
of Applied Physics, School of Sciences, University of Granada, 18071Granada, Spain
| | | | - Antonio Rubio-Andrés
- Department
of Applied Physics, School of Sciences, University of Granada, 18071Granada, Spain
| | - Ana B. Bonhome-Espinosa
- Department
of Applied Physics, School of Sciences, University of Granada, 18071Granada, Spain
| | - Ángel V. Delgado
- Department
of Applied Physics, School of Sciences, University of Granada, 18071Granada, Spain
| | - María L. Jiménez
- Department
of Applied Physics, School of Sciences, University of Granada, 18071Granada, Spain,
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Hernández-Cifre JG, Rodríguez-Schmidt R, Almagro-Gómez CM, García de la Torre J. Calculation of the friction, diffusion and sedimentation coefficients of nanoplatelets of arbitrary shape. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kuznetsov NM, Bakirov AV, Banin EP, Belousov SI, Chvalun SN. In situ X-ray analysis of montmorillonite suspensions in polydimethylsiloxane: Orientation in shear and electric field. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126663] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Dozov I, Goldmann C, Davidson P, Abécassis B. Probing permanent dipoles in CdSe nanoplatelets with transient electric birefringence. NANOSCALE 2020; 12:11040-11054. [PMID: 32373875 DOI: 10.1039/d0nr00884b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Zinc-blende CdSe semiconducting nanoplatelets (NPL) show outstanding quantum confinement properties thanks to their small, atomically-controlled, thickness. For example, they display extremely sharp absorption peaks and ultra-fast recombination rates that make them very interesting objects for optoelectronic applications. However, the presence of a ground-state electric dipole for these nanoparticles has not yet been investigated. We therefore used transient electric birefringence (TEB) to probe the electric dipole of 5-monolayer thick zinc blende CdSe NPL with a parallelepipedic shape. We studied a dilute dispersion of isolated NPL coated with branched ligands and we measured, as a function of time, the birefringence induced by DC and AC field pulses. The electro-optic behavior proves the presence of a large dipolar moment (>245 D) oriented along the length of the platelets. We then induced the slow face-to-face stacking of the NPL by adding oleic acid. In these stacks, the in-plane dipole components of consecutive NPL cancel whereas their normal components add. Moreover, interestingly, the excess polarizability tensor of the NPL stacks gives rise to an electro-optic contribution opposite to that of the electric dipole. By monitoring the TEB signal of the slowly-growing stacks over up to a year, we extracted the evolution of their average length with time and we showed that their electro-optic response can be explained by the presence of a 80 D dipolar component parallel to their normal. In spite of the 4[combining macron]3m space group of bulk zinc blende CdSe, these NPL thus bear an important ground-state dipole whose magnitude per unit volume is twice that found for wurtzite CdSe nanorods. We discuss the possible origin of this electric dipole, its consequences for the optical properties of these nanoparticles, and how it could explain their strong stacking propensity that severely hampers their colloidal stability.
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Affiliation(s)
- Ivan Dozov
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Université Paris-Sud, UMR 8502, 91405 Orsay, France.
| | - Claire Goldmann
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Université Paris-Sud, UMR 8502, 91405 Orsay, France.
| | - Patrick Davidson
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Université Paris-Sud, UMR 8502, 91405 Orsay, France.
| | - Benjamin Abécassis
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Université Paris-Sud, UMR 8502, 91405 Orsay, France. and Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342, Lyon, France
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Sonin AS, Churochkina NA, Kaznacheev AV, Golovanov AV. Liquid Crystals of Clay Dispersions. COLLOID JOURNAL 2019. [DOI: 10.1134/s1061933x18060170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Arenas-Guerrero P, Delgado ÁV, Ramos A, Jiménez ML. Electro-Orientation of Silver Nanowires in Alternating Fields. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:687-694. [PMID: 30557509 DOI: 10.1021/acs.langmuir.8b03122] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, we analyze the orientation of silver nanowires immersed in aqueous solutions, under the effect of alternating electric fields in a broad frequency range covering from a few Hz to several MHz. The degree of orientation is experimentally determined by electro-optical techniques, which present the advantage of measuring multiple particles at the same time. In the electro-orientation spectrum, we observe frequency dispersion in the kHz range and provide a theoretical explanation for this behavior: at high frequencies, charge separation in the nanoparticles leads to a large induced dipole responsible for strong orientation. On the other hand, at low frequencies, redistribution of the ions in solution gives rise to an induced double layer that screens the dipolar fields, and as a consequence, the degree of orientation decreases. Moreover, we measure the transient response when the electric field is switched off, from which the size distribution of the polydisperse sample is obtained. The results match those given by electron microscopy determinations.
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Affiliation(s)
| | - Ángel V Delgado
- Department of Applied Physics , Granada University , Granada 18071 , Spain
| | - Antonio Ramos
- Department of Electronics and Electromagnetism , University of Sevilla , Sevilla 41012 , Spain
| | - María L Jiménez
- Department of Applied Physics , Granada University , Granada 18071 , Spain
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Buluy O, Aryasova N, Tereshchenko O, Kurioz Y, Nazarenko V, Eremin A, Stannarius R, Klein S, Goldmann C, Davidson P, Dozov I, Reznikov Y. Optical and X-ray scattering studies of the electric field-induced orientational order in colloidal suspensions of pigment nanorods. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Arenas-Guerrero P, Delgado ÁV, Donovan KJ, Scott K, Bellini T, Mantegazza F, Jiménez ML. Determination of the size distribution of non-spherical nanoparticles by electric birefringence-based methods. Sci Rep 2018; 8:9502. [PMID: 29934624 PMCID: PMC6015062 DOI: 10.1038/s41598-018-27840-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/11/2018] [Indexed: 12/03/2022] Open
Abstract
The in situ determination of the size distribution of dispersed non-spherical nanoparticles is an essential characterization tool for the investigation and use of colloidal suspensions. In this work, we test a size characterization method based on the measurement of the transient behaviour of the birefringence induced in the dispersions by pulsed electric fields. The specific shape of such relaxations depends on the distribution of the rotational diffusion coefficient of the suspended particles. We analyse the measured transient birefringence with three approaches: the stretched-exponential, Watson-Jennings, and multi-exponential methods. These are applied to six different types of rod-like and planar particles: PTFE rods, goethite needles, single- and double-walled carbon nanotubes, sodium montmorillonite particles and gibbsite platelets. The results are compared to electron microscopy and dynamic light scattering measurements. The methods here considered provide good or excellent results in all cases, proving that the analysis of the transient birefringence is a powerful tool to obtain complete size distributions of non-spherical particles in suspension.
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Affiliation(s)
| | - Ángel V Delgado
- Department of Applied Physics, Univ. Granada, Granada, 18071, Spain
| | - Kevin J Donovan
- School of Physics and Astronomy, Queen Mary Univ. London, London, E14NS, UK
| | - Kenneth Scott
- School of Physics and Astronomy, Queen Mary Univ. London, London, E14NS, UK
| | - Tommaso Bellini
- Department Med. Biotechnol. and Translat. Med., Univ. Milan, Milan, I20090, Italy
| | - Francesco Mantegazza
- Department Medicina e Chirurgia, Univ. Milano-Bicocca, Vedano al Lambro, MB, 20854, Italy
| | - María L Jiménez
- Department of Applied Physics, Univ. Granada, Granada, 18071, Spain.
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Voitylov A, Veso O, Petrov M, Rolich V, Trusov A, Vojtylov V. Light refraction in aqueous suspensions of diamond particles. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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