Pyroelectric Tweezers for Handling Liquid Unit Volumes

Nasti, Giuseppe; Coppola, Sara; Vespini, Veronica; Grilli, Simonetta; Vettoliere, A.; Granata, C.; Ferraro, Pietro

doi:10.1002/aisy.202000044

Cited by 13 publications

(8 citation statements)

References 41 publications

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“…This field can also be used for micro-and nano-manipulation and applied to biomolecules. [44][45][46][47][48] The main advantage of the PY effect is that it exists in any ferroelectric material without the need of doping. However, the all optical control of the PV effect is easy and versatile, and allows higher resolution due to the flexibility and focusing capabilities of light illumination…”

Section: Photovoltaic and Pyroelectric Effects In Lithium Niobatementioning

confidence: 99%

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO₃ Platforms

Puerto

Coppola

Miccio

et al. 2021

Adv Materials Inter

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Controlling liquid dispensing and jetting from a reservoir drop or a liquid film require strong electric fields. One efficient method proposed some years ago is based on the high pyroelectric‐electrohydrodynamic (EHD) effect presented by lithium niobate when it undergoes a high temperature change. Additionally, first experiments generating droplets using the photovoltaic effect of Fe‐doped lithium niobate crystal (LiNbO3:Fe) have been recently reported. Here, it is shown how the excitation of the photovoltaic and pyroelectric effects of LiNbO3:Fe by visible light irradiation allows droplet dispensing and jetting. A basic characterization of the process, including the important role of the excitation light intensity, is reported. The experimental investigation demonstrates that efficient droplet ejection and liquid jetting can be easily achieved in different optical configurations and with various liquid solutions (water, alcohol, aqueous suspension of particles or polymers). This new explored method is analyzed by discussing some of its intrinsic and attractive advantages, namely the flexible and versatile control offered by light excitation and the activation of the photovoltaic and pyroelectric effects. The results let us to foresee that this strategy will have very good chances to become a viable inkjet printing method for addressing new challenges in directed liquid dispensing and patterning.

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Section: Photovoltaic and Pyroelectric Effects In Lithium Niobatementioning

confidence: 99%

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO₃ Platforms

Puerto

Coppola

Miccio

et al. 2021

Adv Materials Inter

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“…In fact, the effect can be triggered by mere contact with the human body (see Video S6 in the Supporting Information). Finally, the PY spatial control may be improved by using focused IR light sources at suitable wavelengths, [5,51,53] hot tips, [5] or microheaters [54] to locally heat up the crystals, although the bulk PV effect is far superior in terms of spatial resolution.…”

Section: Thermally Induced Charge Transfer By the Pyroelectric Effectmentioning

confidence: 99%

Light and Thermally Induced Charge Transfer and Ejection of Micro‐/Nanoparticles from Ferroelectric Crystal Surfaces

Sebastián‐Vicente

Garcı́a-Cabañes

Agulló‐López

et al. 2021

Adv Elect Materials

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pyroelectric (PY) effect, allowing handling and trapping particles being close to the ferroelectric platform. Numerous works have been reported on these techniques and their multiple applications. Some reviews or reference works are refs. [12,15,16] for photovoltaic optoelectronic tweezers (PVOT), and refs. [10,17,18] for PY trapping.The particle ejection phenomenon reported in this paper has been incidentally discovered during particle manipulation with PVOT. [19] The so-called PVOT are a rather recent technique that has undergone a rapid development in the last few years, [16] based on the electric fields generated by the bulk PV effect. This effect is a singular phenomenon which strongly appears in a few crystalline ferroelectric materials, [20,21] such as LiNbO 3 (LN), when properly doped (mainly Fe or Cu). It allows the generation of remarkably high electric fields (up to ≈1.5 × 10 5 V cm −1 ) [22] for moderate or low light excitation levels (around mW cm −2 ). The PV effect is associated with optical transitions from localized states of impurities, such as Fe 2+ /Fe 3+ or Cu + /Cu 2+ , and with a directional electron migration along the polar axis (PV current). Once displaced, the electrons are trapped in other defects and generate a spatial charge distribution and the corresponding electric field, [23] which are illustrated in Figure 1. Two crystal configurations (parallel and perpendicular), commonly used for particle manipulation, are shown. [24,25] They are defined by the orientation of the polar axis, parallel or perpendicular to the active surface, respectively. The PV electric field extends near the surface outside the crystal (evanescent PV fields), where it can act either on charged particles via electrophoretic forces, or on neutral objects polarized by the field via dielectrophoretic forces, [26,27] as illustrated in Figure 1.So far, the vast majority of the reported experimental results have been obtained by using a two-step sequential procedure: first, the PV substrate is illuminated, and then, the particles are manipulated and trapped by means of the light-induced PV electric fields. This sequential method can be employed because the PV fields remain after illumination for periods of time in the range of days to months unless they are thermally erased or externally screened. Although this method is quite convenient to trap particles and assemble permanent particle structures, other applications require real-time manipulation.During real-time operation of photovoltaic optoelectronic tweezers, a novel intriguing phenomenon has been recently observed, namely, silver nanoparticles previously deposited on ferroelectric LiNbO 3 :Fe surfaces are ejected from them by illumination. Here, it is shown that this phenomenon results from the electrical charging of the micro-/nanoparticles previously trapped on the LiNbO 3 :Fe surfaces and the subsequent Coulomb repulsion. Specific experiments are performed to determine the sign of the transferred charges, which is negative/positive for the +c/−c sample face...

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“…Recently, a review on this and many other applications of ferroelectrics in Biology has been published (Blázquez-Castro et al, 2018b). It would be interesting to combine OT with photoresponsive ferroelectrics for Cell Biology and Genetics, particularly when these materials have been shown capable of driving controlled movement of micrometric liquid volumes, relevant when talking about cellular processes (Nasti et al, 2020).…”

Section: Transversal Technical Approachesmentioning

confidence: 99%

Genetic Material Manipulation and Modification by Optical Trapping and Nanosurgery-A Perspective

Blázquez‐Castro

Fernández‐Piqueras

Santos

2020

Front. Bioeng. Biotechnol.

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Light can be employed as a tool to alter and manipulate matter in many ways. An example has been the implementation of optical trapping, the so called optical tweezers, in which light can hold and move small objects with 3D control. Of interest for the Life Sciences and Biotechnology is the fact that biological objects in the size range from tens of nanometers to hundreds of microns can be precisely manipulated through this technology. In particular, it has been shown possible to optically trap and move genetic material (DNA and chromatin) using optical tweezers. Also, these biological entities can be severed, rearranged and reconstructed by the combined use of laser scissors and optical tweezers. In this review, the background, current state and future possibilities of optical tweezers and laser scissors to manipulate, rearrange and alter genetic material (DNA, chromatin and chromosomes) will be presented. Sources of undesirable effects by the optical procedure and measures to avoid them will be discussed. In addition, first tentative approaches at cellular-level genetic and organelle surgery, in which genetic material or DNA-carrying organelles are extracted out or introduced into cells, will be presented.

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Pyroelectric Tweezers for Handling Liquid Unit Volumes

Cited by 13 publications

References 41 publications

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO₃ Platforms

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO₃ Platforms

Light and Thermally Induced Charge Transfer and Ejection of Micro‐/Nanoparticles from Ferroelectric Crystal Surfaces

Genetic Material Manipulation and Modification by Optical Trapping and Nanosurgery-A Perspective

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Pyroelectric Tweezers for Handling Liquid Unit Volumes

Cited by 13 publications

References 41 publications

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO3 Platforms

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO3 Platforms

Light and Thermally Induced Charge Transfer and Ejection of Micro‐/Nanoparticles from Ferroelectric Crystal Surfaces

Genetic Material Manipulation and Modification by Optical Trapping and Nanosurgery-A Perspective

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Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO₃ Platforms

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro‐Photovoltaic Fe‐Doped LiNbO₃ Platforms