研究目的
To develop a method for precise manipulation and deposition of block copolymer nanostructures using optical tweezers to enable their incorporation into devices.
研究成果
Optical tweezers enable precise 3D control and deposition of block copolymer micelles, facilitating the creation of customizable arrays. Automation with holographic assembly allows efficient fabrication of complex structures, potentially advancing applications in optoelectronics and other fields.
研究不足
The positional accuracy of deposition is limited by micelle orientation (219 ± 120 nm). The process is slower than industrial requirements, and further optimization is needed for speed and precision. Visualization is challenging for small micelles below the diffraction limit.
1:Experimental Design and Method Selection:
The study uses optical tweezers combined with TIRF imaging for trapping and manipulating cylindrical micelles and hybrid structures. Dynamic holographic assembly with a spatial light modulator (SLM) is employed for automated deposition.
2:Sample Selection and Data Sources:
Cylindrical micelles made from PFS-b-PDMS block copolymers and hybrid dandelion structures with silica beads are prepared via self-assembly in selective solvents.
3:List of Experimental Equipment and Materials:
Includes a custom-built microscope with Nikon components, lasers (488 nm and 1064 nm), EMCCD camera, SLM, motorized stages, and materials like silica beads and block copolymers.
4:Experimental Procedures and Operational Workflow:
Samples are prepared in capillary tubes or on glass slides. Optical traps are used to manipulate micelles, which are deposited on surfaces. Automated processes involve image analysis and collision avoidance algorithms.
5:Data Analysis Methods:
TEM and optical microscopy are used for characterization; LabVIEW is used for automation and image processing.
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camera
iXon EMCCD
Andor
Records images during TIRF and trapping experiments.
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microscope
Axiovert 200
Zeiss
Used for automated deposition experiments with optical tweezers.
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objective
Plan-Neufluar
Zeiss
Used in the automated setup for imaging and trapping.
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piezoelectric focusing system
Mipos 140 PL
Piezosystem Jena
Controls the z-axis focus in the automated setup.
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silica beads
900 nm
Bangs Laboratories
Used as cores for hybrid dandelion structures in the experiment.
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microscope
Nikon Eclipse Ti
Nikon
Used for TIRF imaging and optical trapping in the experiment.
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objective
Apo TIRF
Nikon
Part of the microscope for high-resolution imaging and trapping.
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laser
LightHUB
Omicron
Provides 488 nm laser beam for TIRF illumination.
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laser
SPI
SPI
Provides 1090 nm laser for optical trapping.
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spatial light modulator
P512-0785
Boulder Nonlinear Systems
Used for dynamic holographic assembly to create multiple optical traps.
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stage
MS2000
ASI
Motorized stage for precise movement during experiments.
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