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Yuzu K, Lin CY, Yi PW, Huang CH, Masuhara H, Chatani E. Spatiotemporal formation of a single liquid-like condensate and amyloid fibrils of α-synuclein by optical trapping at solution surface. Proc Natl Acad Sci U S A 2024; 121:e2402162121. [PMID: 39292741 PMCID: PMC11441557 DOI: 10.1073/pnas.2402162121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 08/14/2024] [Indexed: 09/20/2024] Open
Abstract
Liquid-like protein condensates have recently attracted much attention due to their critical roles in biological phenomena. They typically show high fluidity and reversibility for exhibiting biological functions, while occasionally serving as sites for the formation of amyloid fibrils. To comprehend the properties of protein condensates that underlie biological function and pathogenesis, it is crucial to study them at the single-condensate level; however, this is currently challenging due to a lack of applicable methods. Here, we demonstrate that optical trapping is capable of inducing the formation of a single liquid-like condensate of α-synuclein in a spatiotemporally controlled manner. The irradiation of tightly focused near-infrared laser at an air/solution interface formed a condensate under conditions coexisting with polyethylene glycol. The fluorescent dye-labeled imaging showed that the optically induced condensate has a gradient of protein concentration from the center to the edge, suggesting that it is fabricated through optical pumping-up of the α-synuclein clusters and the expansion along the interface. Furthermore, Raman spectroscopy and thioflavin T fluorescence analysis revealed that continuous laser irradiation induces structural transition of protein molecules inside the condensate to β-sheet rich structure, ultimately leading to the condensate deformation and furthermore, the formation of amyloid fibrils. These observations indicate that optical trapping is a powerful technique for examining the microscopic mechanisms of condensate appearance and growth, and furthermore, subsequent aging leading to amyloid fibril formation.
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Affiliation(s)
- Keisuke Yuzu
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
| | - Ching-Yang Lin
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
| | - Po-Wei Yi
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
| | - Chih-Hao Huang
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
| | - Hiroshi Masuhara
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
| | - Eri Chatani
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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Amaya AJ, Goldmann C, Hill EH. Thermophoresis-Induced Polymer-Driven Destabilization of Gold Nanoparticles for Optically Directed Assembly at Interfaces. SMALL METHODS 2024:e2400828. [PMID: 38958377 DOI: 10.1002/smtd.202400828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Revised: 06/21/2024] [Indexed: 07/04/2024]
Abstract
The limitations of conventional template-based methods for the deposition of nanoparticle assemblies into defined patterns on solid substrates call for the development of techniques that do not require templates or lithographic masks. The use of optically-induced thermal gradients to drive the migration of colloids toward or away from a laser spot, known as opto-thermophoresis, has shown promise for the low-power trapping and optical manipulation of a variety of colloidal species. However, the printing of colloids using this technique has so far not been established. Herein, a method for the optically directed printing of noble metal nanoparticles, specifically gold nanospheres is reported. The thermophoresis of the polymer polyvinylpyrrolidone and gold nanospheres toward a laser spot led to the deposition of nanoparticle aggregates, capable of serving as surface-enhanced Raman scattering substrates. The influence of heating laser power and the concentrations of polymer, salt, and surfactant on the nanoparticle deposition rate and structure of the printed pattern are studied, showing that a variety of conditions can permit printing, suggesting facile generalization to different nanoparticle compositions, sizes, and shapes. These findings will greatly benefit future efforts for directed nanoparticle assembly, and drive applications in sensing, photothermal heating, and relevant applications in biomedicine and devices.
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Affiliation(s)
- Ana Jiménez Amaya
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146, Hamburg, Germany
| | - Claire Goldmann
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, Orsay, 91405, France
| | - Eric H Hill
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146, Hamburg, Germany
- The Hamburg Center for Ultrafast Imaging (CUI), Luruper Chausee 149, 22761, Hamburg, Germany
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Goswami J, Nalupurackal G, Lokesh M, Roy S, Chakraborty S, Bhattacharya A, Mahapatra PS, Roy B. Formation of Two-Dimensional Magnetically Responsive Clusters Using Hematite Particles Self-Assembled via Particle-Induced Heating at an Interface. J Phys Chem B 2023; 127:8487-8495. [PMID: 37733383 DOI: 10.1021/acs.jpcb.3c02229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Hematite particles, which exhibit a high magnetic moment, are used to apply large forces on physical and biological systems under magnetic fields to investigate various phenomena, such as those of rheology and micromanipulation. However, the magnetic confinement of these particles requires complicated field configurations. On the other hand, laser-assisted optical confinement of single hematite particles results in thermophoresis and subsequent ejection of the particle from the laser spot. Herein, we explore an alternative strategy to induce the self-assembly of hematite. In this strategy, with indirect influence from an optically confined and heated upconverting particle (UCP) at an air-water interface, there is the generation of convection currents that facilitate assembly. We also show that the assembly remains at the interface even after removal of the laser light. The hematite particle assemblies can then be moved using magnetic fields and employed to perform interfacial rheology.
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Affiliation(s)
- Jayesh Goswami
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-Group, IIT Madras, Chennai 600036, India
| | - Gokul Nalupurackal
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-Group, IIT Madras, Chennai 600036, India
| | - Muruga Lokesh
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-Group, IIT Madras, Chennai 600036, India
| | - Srestha Roy
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-Group, IIT Madras, Chennai 600036, India
| | - Snigdhadev Chakraborty
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-Group, IIT Madras, Chennai 600036, India
| | - Arijit Bhattacharya
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Pallab Sinha Mahapatra
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Basudev Roy
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-Group, IIT Madras, Chennai 600036, India
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Lokesh M, Nalupurackal G, Roy S, Chakraborty S, Goswami J, Gunaseelan M, Chowdhury IU, Bhallamudi VP, Sinha Mahapatra P, Roy B. Accelerated self assembly of particles at the air-water interface with optically assisted heating due to an upconverting particle. OPTICS EXPRESS 2023; 31:5075-5086. [PMID: 36785459 DOI: 10.1364/oe.481722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 01/03/2023] [Indexed: 06/18/2023]
Abstract
Particles can be assembled at the air-water interface due to optically induced local heating. This induces convection currents in the water which brings particles to the surface. We improve the technique by employing an upconverting particle (UCP), which, when illuminated with 975 nm light, not only emits visible emission but also generates heat owing to the poor efficiency of the upconversion process. This induces strong convection currents which makes particles dispersed in the suspension assemble at the interface and immediately under the UCP. We show assembly of polystyrene particles of 1 μm diameter and diamonds of 500 nm diameter bearing Nitrogen-Vacancy (NV) centers around the UCP. We also show, for the first time, that the microdiamonds are assembled within about 30 nm at the bottom of the UCP by utilizing non-radiative energy transfer that reduces the lifetime of the 550 nm emission from about 90 μs to about 50 μs.
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Pradhan S, Whitby CP, Williams MAK, Chen JLY, Avci E. Interfacial colloidal assembly guided by optical tweezers and tuned via surface charge. J Colloid Interface Sci 2022; 621:101-109. [PMID: 35452924 DOI: 10.1016/j.jcis.2022.04.044] [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: 12/15/2021] [Revised: 04/05/2022] [Accepted: 04/07/2022] [Indexed: 10/18/2022]
Abstract
HYPOTHESIS The size, shape and dynamics of assemblies of colloidal particles optically-trapped at an air-water interface can be tuned by controlling the optical potential, particle concentration, surface charge density and wettability of the particles and the surface tension of the solution. EXPERIMENTS The assembly dynamics of different colloidal particle types (silica, polystyrene and carboxyl coated polystyrene particles) at an air-water interface in an optical potential were systematically explored allowing the effect of surface charge on assembly dynamics to be investigated. Additionally, the pH of the solutions were varied in order to modulate surface charge in a controllable fashion. The effect of surface tension on these assemblies was also explored by reducing the surface tension of the supporting solution by mixing ethanol with water. FINDINGS Silica, polystyrene and carboxyl coated polystyrene particles showed distinct assembly behaviours at the air-water interface that could be rationalised taking into account changes in surface charge (which in addition to being different between the particles could be modified systematically by changing the solution pH). Additionally, this is the first report showing that wettability of the colloidal particles and the surface tension of the solution are critical in determining the resulting assembly at the solution surface.
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Affiliation(s)
- Susav Pradhan
- School of Fundamental Sciences, Massey University, Palmerston North 4410, New Zealand; Department of Mechanical and Electrical Engineering, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand
| | - Catherine P Whitby
- School of Fundamental Sciences, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
| | - Martin A K Williams
- School of Fundamental Sciences, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
| | - Jack L Y Chen
- Centre for Biomedical and Chemical Sciences, Auckland University of Technology, Auckland 1010, New Zealand; Department of Biotechnology, Chemistry and Pharmaceutical Sciences, Universitá degli Studi di Siena, Siena 53100, Italy; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand
| | - Ebubekir Avci
- Department of Mechanical and Electrical Engineering, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
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Abstract
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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Affiliation(s)
- Zhihan Chen
- Materials Science & Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Jingang Li
- Materials Science & Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Yuebing Zheng
- Materials Science & Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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Abstract
When an intense 1,064-nm continuous-wave laser is tightly focused at solution surfaces, it exerts an optical force on molecules, polymers, and nanoparticles (NPs). Initially, molecules and NPs are gathered into a single assembly inside the focus, and the laser is scattered and propagated through the assembly. The expanded laser further traps them at the edge of the assembly, producing a single assembly much larger than the focus along the surface. Amino acids and inorganic ionic compounds undergo crystallization and crystal growth, polystyrene NPs form periodic arrays and disklike structures with concentric circles or hexagonal packing, and Au NPs demonstrate assembling and swarming, in which the NPs fluctuate like a group of bees. These phenomena that depend on laser polarization are called optically evolved assembling at solution surfaces, and their dynamics and mechanisms are elucidated in this review. As a promising application in materials science, the optical trapping assembly of lead halide perovskites, supramolecules, and aggregation-induced emission enhancement-active molecules is demonstrated and future directions for fundamental study are discussed.
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Affiliation(s)
- Hiroshi Masuhara
- Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 30010, Taiwan;
| | - Ken-Ichi Yuyama
- Department of Chemistry, Osaka City University, Osaka 558-8585, Japan;
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