Buckling into single-handed chiral structures from pH-sensitive hydrogel membranes
Extreme Mechanics Letters, ISSN: 2352-4316, Vol: 7, Page: 49-54
2016
- 11Citations
- 30Captures
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Article Description
We investigate swelling induced pattern transformation of pH-sensitive hydrogel membranes made of poly(2-hydroxyethyl methacrylate)- co -poly(acrylic acid) (PHEMA- co -PAA) with periodic pores in both square and oblique arrays. The hydrogel membranes are fabricated by replica molding from a poly(dimethylsiloxane) (PDMS) mold with square arrayed pillars, or from the same mold that is mechanically pre-stretched at a very small strain (5%) at different angles (15 °, 30 °, 45 °, 60 °, and 75 ° ) relative to the lattice axis. When swollen in different pH buffer solutions, the membrane undergoes buckling of pores to slits at pH 3 (achiral, swelling ratio ∼2.0) to onset of symmetry breaking of slits at pH 4.7 (swelling ratio ∼2.3), to the formation of twisted, “S” shaped slits at pH 6.4 (chiral, swelling ratio ∼5.8). While swelling of the square array hydrogel membranes leads to ∼50/50 mixture of right- and left-handed chiral structures, predominant single handedness with enantiomeric excess fraction >95% (i.e. the absolute difference between the mole fraction of each enantiomer) is obtained from the oblique array of porous membranes. Single left-handedness is obtained from the ones with low pre-stretching angles (15 ° and 30 ° ), while nearly exclusive right-handedness is obtained from the ones with larger pre-stretching angles (60 ° and 75 ° ).
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S2352431615001273; http://dx.doi.org/10.1016/j.eml.2015.12.011; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84979519046&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S2352431615001273; https://api.elsevier.com/content/article/PII:S2352431615001273?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S2352431615001273?httpAccept=text/plain; https://dul.usage.elsevier.com/doi/; https://dx.doi.org/10.1016/j.eml.2015.12.011
Elsevier BV
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