Anomalously Large Assembly Formation of Polystyrene Nanoparticles by Optical Trapping at the Solution Surface

Wu, Chi Lung; Wang, Shun Fa; Kudo, Tetsuichi; Yuyama, Ken‐ichi; Sugiyama, Teruki; Masuhara, Hiroshi

doi:10.1021/acs.langmuir.0c02349

Cited by 11 publications

(9 citation statements)

References 38 publications

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“…A single large assembly containing fiber-like aggregates disappeared upon turning off the trapping laser, and it recovered after turning it on again. It is notable, furthermore, that this assembling of the 100 nm PS NPs occurs around a single 10 μm PS MP, which is exclusively irradiated at the surface . In both cases with and without the big 10 μm PS MP, we could not observe clearly scattering and propagation of the trapping laser which enables the formation of such the wide assembly.…”

Section: Resultsmentioning

confidence: 74%

“…It is notable, furthermore, that this assembling of the 100 nm PS NPs occurs around a single 10 μm PS MP, which is exclusively irradiated at the surface. 41 In both cases with and without the big 10 μm PS MP, we could not observe clearly scattering and propagation of the trapping laser which enables the formation of such the wide assembly. As an alternative possible mechanism to realize such a long-range interaction between the focus and whole area of the assembly, we suggested an electrostatic interaction started at the focused area.…”

Section: Resultsmentioning

confidence: 74%

“…At the air/solution interface of H 2 O solution without lysozyme, we reported that an extremely large disk-like assembly was formed for 100 nm PS NPs under the same surface trapping condition. 41 The size of that assembly was much larger than that of 200 nm PS NPs, 16 500 nm PS NPs, 18 and 1 μm PS MPs, 19 and additionally, many fiber-like aggregates of 100 nm NPs were overlaid there. A single large assembly containing fiber-like aggregates disappeared upon turning off the trapping laser, and it recovered after turning it on again.…”

Section: Resultsmentioning

confidence: 95%

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Cooperative Optical Trapping of Polystyrene Microparticle and Protein Forming a Submillimeter Linear Assembly of Microparticle

Chiu

Kudo

et al. 2021

J. Phys. Chem. C

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Optical trapping of dielectric and metal particles yields different types of "optically evolving assembly" at air/solution and glass/ solution interfaces. However, all these structures have in common that the trapping laser is scattered and propagated through the assembly, expanding from the focus up to a few tens of micrometers. In the present work, we fabricate a single submillimeter linear assembly of polystyrene microparticles starting from the surface of a concentrated lysozyme D 2 O solution. Such assembly has a three-dimensional linear structure composed of a single microparticle aggregate without folding and bending. Indeed, it is prepared along the lysozyme assembly, which is also generated by optical trapping. The cooperative trapping of the microparticle and lysozyme did not arrange as a homogeneously distributed assembly. Instead, a unique anomalously long assembly of microparticles and a densely, widely, and deeply expanded lysozyme layer were simultaneously prepared. Their morphology was reconstructed by shifting the imaging plane immediately after switching off the trapping laser. Independently, the lysozyme assembly was also confirmed by fluorescence imaging and Raman scattering spectroscopy. Thus, we consider that the described cooperative "optically evolved assembling" has a large potential to fabricate hybrid materials with applications in different fields such as colloid science, protein chemistry, and soft matter.

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 95%

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Cooperative Optical Trapping of Polystyrene Microparticle and Protein Forming a Submillimeter Linear Assembly of Microparticle

Chiu

Kudo

et al. 2021

J. Phys. Chem. C

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“…Wu et al also demonstrated the large-scale optical assembly of PS particles into needle-like structures in the radial direction with the assistance of negative thermophoresis and thermal convection. 306 Through the coordination of natural convective flow, negative thermophoresis, and optical force, Ho and co-workers demonstrated long-range and 3D optical trapping of PS beads and Escherichia coli (E. coli) bacteria (Figure 19e). 307 The convective flow was exploited to transport dispersed particles toward the Au-coated fiber tip.…”

Section: Optothermal Assembly Based On Natural Convectionmentioning

confidence: 99%

Heat-Mediated Optical Manipulation

Chen

Zheng

2021

Chem. Rev.

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Progress in optical manipulation has stimulated remarkable advances in a wide range of fields, including materials science, robotics, medical engineering, and nanotechnology. This Review focuses on an emerging class of optical manipulation techniques, termed heat-mediated optical manipulation. In comparison to conventional optical tweezers that rely on a tightly focused laser beam to trap objects, heat-mediated optical manipulation techniques exploit tailorable optothermo–matter interactions and rich mass transport dynamics to enable versatile control of matter of various compositions, shapes, and sizes. In addition to conventional tweezing, more distinct manipulation modes, including optothermal pulling, nudging, rotating, swimming, oscillating, and walking, have been demonstrated to enhance the functionalities using simple and low-power optics. We start with an introduction to basic physics involved in heat-mediated optical manipulation, highlighting major working mechanisms underpinning a variety of manipulation techniques. Next, we categorize the heat-mediated optical manipulation techniques based on different working mechanisms and discuss working modes, capabilities, and applications for each technique. We conclude this Review with our outlook on current challenges and future opportunities in this rapidly evolving field of heat-mediated optical manipulation.

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“…In 2015, the first optically evolved assembly was reported by trapping polystyrene (PS) NPs at the air/solution interface . Since then, several kinds of optically evolved assemblies were reported using PS particles at both air/solution and glass/solution interfaces. − The formation of these assemblies is driven by the expansion of the optical potential through light propagation from the irradiated constituents. However, the basis of the “optically evolved phenomena” is not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Photon Momentum Dictates the Shape of Swarming Gold Nanoparticles in Optical Trapping at an Interface

et al. 2021

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Optical trapping at an interface mediates the gathering and assembling of particles, inducing the so-called optically evolved assembly that can expand outside the laser focus due to multiple scattering processes. In previous studies, we reported that the so-called Au nanoparticle (NP) dynamically evolving assembly has a dumbbell shape, in which the Au NPs fluctuate in a cooperative fashion, like a swarm of bees. The shape and the size of such an assembly can be controlled from a physicochemical point of view, considering the intrinsic surface plasmon resonance properties of Au NPs. In this work, we will demonstrate that changing the optical conditions of trapping represents an alternative approach for controlling the shape of the swarming NPs. Strikingly, we observe two new appearances of the swarm with elliptical and ring distribution of particles by shifting the axial position of the trapping laser focus with respect to the interface. Indeed, we can modify the outline of the assemblies by displacing the dynamic equilibrium between the different "optically evolved assembly" states. Moreover, the contours of the dumbbell state can be further controlled by the incident and focusing angles of the electromagnetic radiation used in the trapping process. The results are elucidated in terms of the considerable scattering force that arises from the momentum transfer between photons and Au NPs. This work shows the importance of the momentum direction of incident photons at the interface, establishing critical steps to comprehensively control the "optically evolved assembly" phenomena, which has a large potential in research fields such as soft matter or colloidal chemistry.

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Anomalously Large Assembly Formation of Polystyrene Nanoparticles by Optical Trapping at the Solution Surface

Cited by 11 publications

References 38 publications

Cooperative Optical Trapping of Polystyrene Microparticle and Protein Forming a Submillimeter Linear Assembly of Microparticle

Cooperative Optical Trapping of Polystyrene Microparticle and Protein Forming a Submillimeter Linear Assembly of Microparticle

Heat-Mediated Optical Manipulation

Photon Momentum Dictates the Shape of Swarming Gold Nanoparticles in Optical Trapping at an Interface

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