Abstract
For designing the responsive polymer brushes, and tuning the local and chemical surface responses to the external stimuli, the epitaxial single crystals were patterned by combination of bared surfaces of poly(ethylene glycol) (PEG) substrate, polymer homo-brushes constructed from poly(ethylene glycol)-b-polystyrene (PEG-b-PS) as well as poly(ethylene glycol)-b-poly(methyl methacrylate) (PEG-b-PMMA), and PEG-b-PS/PEG-b-PMMA mixed-brush channels. To achieve this target, various single crystals and epitaxial structures grown from dilute solutions through self-seeding approach were utilized as seeds to fabricate the next channels. The characteristics and morphologies of different channels were detectable by atomic force microscopy (AFM). The influence of chemical (solvent quality and interaction of substrate with different brushes) and physical (presence of brushes from another type in their vicinity) environments on crystallization was studied. Due to the effect of chemical environment, the PS brushes hampered the growth of PEG crystals at M n PS = 10,000 g/mol. However, the PMMA brushes allowed PEG crystals to grow completely at M n PMMA =13,100 g/mol, and indicated their hindrance at higher molecular weights (here, M n PMMA = 17,100 g/mol). It was feasible to neutralize the mentioned hindrance through fabricating the channels with brushes having the highest hindrance (M n PS = 14,800 g/mol and M n PMMA = 17,100 g/mol), and altering the physical environment from homo- to mixed-brush morphology. The characteristics (thickness, tethering density, and domain size) of developed channels from a certain material, in all arrangements and in various channels were in good agreement with those of corresponding non-epitaxial single crystals grown under the same conditions.
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The authors are indebted to the Iran National Science Foundation.
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Agbolaghi, S., Abbasi, F. & Abbaspoor, S. Epitaxial single crystal surface patterning and study of physical and chemical environmental effects on crystal growth. Colloid Polym Sci 292, 1375–1383 (2014). https://doi.org/10.1007/s00396-014-3197-9
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DOI: https://doi.org/10.1007/s00396-014-3197-9
Keywords
- Epitaxial single crystals
- Crystal growth
- Physical environment
- Chemical environment
- PEG-b-PS
- PEG-b-PMMA