Microparticle electrical conductivity measurement using optoelectronic tweezers.
J Appl Phys
; 134(11): 113104, 2023 Sep 21.
Article
en En
| MEDLINE
| ID: mdl-37736285
ABSTRACT
When it comes to simulate or calculate an optoelectronic tweezer (OET) response for a microparticle suspended in a given medium, a precise electrical conductivity (later referred to as conductivity) value for the microparticle is critical. However, there are not well-established measurements or well-referenced values for microparticle conductivities in the OET realm. Thus, we report a method based on measuring the escape velocity of a microparticle with a standard OET system to calculate its conductivity. A widely used 6 µm polystyrene bead (PSB) is used for the study. The conductivity values are found to be invariant around 2×10-3 S/m across multiple different aqueous media, which helps clarify the ambiguity in the usage of PSB conductivity. Our convenient approach could principally be applied for the measurement of multiple unknown OET-relevant material properties of microparticle-medium systems with various OET responses, which can be beneficial to carry out more accurate characterization in relevant fields.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Appl Phys
Año:
2023
Tipo del documento:
Article
País de afiliación:
Estados Unidos