Accumulation mechanism of nanoparticles around photothermally generated surface bubbles

Okada, Koki; Kodama, Kento; Yamamoto, Ken; Motosuke, Masahiro

doi:10.1007/s11051-021-05305-2

Cited by 4 publications

(2 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, their performance may be flexibly altered by adjusting the control signal. Several forces are utilized to control particles, such as magnetic, [16] optical, [17] acoustic, [18] and electric forces. [19][20][21][22][23] In particular, electrokinetic forces are used in these techniques to concentrate particles because they are ideally suited for microfluidic applications and can easily create a high field strength with a minimal voltage across a wide frequency range.…”

Section: Introductionmentioning

confidence: 99%

Tuning AC Electrokinetic Flow to Enhance Nanoparticle Accumulation in Low‐Conductivity Solutions

Abdelghany,

Ichikawa,

Motosuke

2023

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

This study presents a novel AC electrokinetics‐based microfluidic approach for nanoparticle trapping and accumulation in low‐conductive aqueous solutions. The concentration performance is systematically investigated by tuning the applied voltage and frequency, showing that AC electrothermal flow (ACET)‐induced vortex trapping provides a field strength‐dependent concentration enhancement and a high concentration factor. The findings reveal a substantial enhancement in the concentration of polystyrene nanoparticles with sizes of 100 nm. Specifically, a 16‐fold enrichment in the concentration is achieved compared with the initial concentration of the sample. In addition, the effectiveness of a high‐frequency AC voltage (50–150 kHz) versus a low‐frequency accumulation (1–20 kHz) for nanoparticle accumulation is compared and it is determined that at high frequencies, the trapped nanoparticles accumulate at a single area at the electrode gap, which differs from the low‐frequency accumulation observed in previous studies. The complex behavior of nanoparticle accumulation is analyzed, including the differences in the hydrodynamic flow patterns between AC electroosmosis and ACET flow. The proposed technique provides a powerful tool for the efficient and controllable manipulation of nanoparticles and contributes to a highly sensitive characterization of nanomaterials in low‐conductivity liquid samples in microfluidic systems through efficient particle trapping.

show abstract

Section: Introductionmentioning

confidence: 99%

Tuning AC Electrokinetic Flow to Enhance Nanoparticle Accumulation in Low‐Conductivity Solutions

Abdelghany,

Ichikawa,

Motosuke

2023

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

show abstract

“…The scale of materials to be analyzed is becoming smaller and smaller. Therefore, the importance of collection or manipulation techniques to handle nanomaterials is also increased [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Gap Effect on Electric Field Enhancement and Photothermal Conversion in Gold Nanostructures

et al. 2022

Self Cite

View full text Add to dashboard Cite

Plasmonic optical tweezers and thermophoresis are promising tools for nanomaterial manipulation. When a gold nanostructure is irradiated with laser light, an electric field around the nanostructure is enhanced because of the localized surface plasmon resonance, which increases the optical radiation pressure applied to the nanomaterials. In addition, a temperature gradient is also generated by the photothermal conversion, and thermophoretic force is then generated. This study numerically evaluated the electric and temperature fields induced by the localized surface plasmon resonance between two gold nanostructures. Here, we focused on the effect of the gap width between nanostructures on the optical radiation pressure and thermophoretic force. The simulation results show that the electric field is locally enhanced according to the gap width, but the effect on the temperature rise due to the photothermal heating is small. This fact suggests that the gap effect between the nanostructures is particularly dominant in nanomanipulation using optical force, whereas it has little effect in nanomanipulation using thermophoresis.

show abstract

Additive manufacturing of 3D surface microstructures through repetitively nucleated plasmonic bubbles

Wang,

Dong,

Wang

et al. 2024

Surfaces and Interfaces

View full text Add to dashboard Cite

Accumulation mechanism of nanoparticles around photothermally generated surface bubbles

Cited by 4 publications

References 37 publications

Tuning AC Electrokinetic Flow to Enhance Nanoparticle Accumulation in Low‐Conductivity Solutions

Tuning AC Electrokinetic Flow to Enhance Nanoparticle Accumulation in Low‐Conductivity Solutions

Gap Effect on Electric Field Enhancement and Photothermal Conversion in Gold Nanostructures

Additive manufacturing of 3D surface microstructures through repetitively nucleated plasmonic bubbles

Contact Info

Product

Resources

About