研究目的
To explore a photochemical design method for patterning adhesive interfaces and optimize parameters affecting bonding quality, including geometry and strength.
研究成果
Patterned adhesive interfaces fabricated via dewetting and photochemical crosslinking offer controlled geometry and enhanced mechanical strength compared to continuous films. Optimal conditions include 15 min partial crosslinking and 20 min full crosslinking, with pattern design influencing stress distribution and failure modes. The approach enables precise adhesive pad formation without dispensing limitations.
研究不足
The method requires precise control of surface patterning and crosslinking times; it may be limited by the viscosity and concentration of the adhesive, and the scalability for large-scale production is not fully addressed. Optimization is needed for different adhesive types and substrate materials.
1：Experimental Design and Method Selection:
The study involves lithographic patterning of surfaces with hydrophilic and hydrophobic domains, dewetting of adhesive liquids, and photochemical crosslinking under UV light to create and stabilize adhesive pads. Theoretical models include Young's equation for contact angles and lubrication approximation for dip-coating thickness.
2：Sample Selection and Data Sources:
Polymethyl-methacrylate (PMMA) microscope slides (75 mm × 25 mm × 1 mm) were used as substrates. Adhesive formulations included NOA 74 adhesive diluted with ethanol in various ratios.
3：List of Experimental Equipment and Materials:
Equipment includes a dosing syringe for drop-wise deposition, dip-coating setup, UV illumination sources (Stratalinker 2400 UV, pen-ray lamp), contact angle device (OCA20), tensile tester (Z2.5), optical microscopes (eclipse TS 100F, BX51), and materials like MABP-FP copolymer, NOA 74 adhesive, ethanol, rhodamine B.
4：5), optical microscopes (eclipse TS 100F, BX51), and materials like MABP-FP copolymer, NOA 74 adhesive, ethanol, rhodamine B. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Steps include substrate preparation, deposition and crosslinking of hydrophobic film, photo-ablation for patterning, adhesive application (drop-wise or dip-coating), partial and full UV crosslinking, and adhesive strength testing via lap-shear tests.
5：Data Analysis Methods:
Data were analyzed using statistical methods (averages from repeated tests), geometric calculations for drop height, and force-displacement curves for mechanical properties.
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optical microscope
eclipse TS 100F
Nikon Instruments
Used for optical microscopy of adhesive patterns.
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fluorescence microscope
BX51
Olympus
Used for fluorescence microscopy of adhesive patterns.
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adhesive
NOA 74
Norland Optical Adhesive
Used as the photochemically crosslinkable adhesive in experiments.
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microscope slides
PMMA (polymethyl-methacrylate)
Used as substrates for adhesive patterning experiments.
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dosing syringe
Used for local deposition of adhesive droplets onto patterned surfaces.
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UV illumination source
Stratalinker 2400 UV
Stratagene
Used for photochemical crosslinking of adhesive and hydrophobic film.
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UV lamp
pen-ray lamp
L.O.T. Oriel GmbH
Used for photo-ablation of the hydrophobic film.
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contact angle device
OCA20
DataPhysics Instruments
Used for measuring contact angles of adhesive droplets.
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tensile tester
Z2.5
Zwick Roell GmbH
Used for lap-shear tests to determine adhesive strength.
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