Lipids and amphiphilic block copolymers spontaneously self-assemble in water to form a plethora of micelles and vesicles. They are typically fluidic in nature and often mechanically weak for applications such as drug delivery and gene therapeutics. Mechanical properties of polymeric materials could be improved by forming crystalline structures. However, most of the self-assembled micelles and vesicles have curved surfaces and precisely tuning crystallization within a nanoscale curved space is challenging, as the curved geometry is incommensurate with crystals having three-dimensional translational symmetry. Herein, we report using a miniemulsion crystallization method to grow nanosized, polymer single-crystal-like capsules. We coin the name crystalsome to describe this unique structure, because they are formed by polymer lamellar crystals and their structure mimics liposomes and polymersomes. Using poly(L-lactic acid) (PLLA) as the model polymer, we show that curved water/p-xylene interface formed by the miniemulsion process can guide the growth of PLLA single crystals. Crystalsomes with the size ranging from similar to 148 nm to over 1 mu m have been formed. Atomic force microscopy measurement demonstrate a two to three orders of magnitude increase in bending modulus compared with conventional polymersomes. We envisage that this novel structure could shed light on investigating spherical crystallography and drug delivery.
Highly robust crystalsome via directed polymer crystallization at curved liquid/liquid interface
Creators
Wenda Wang - Drexel University
Hao Qi - Drexel University
Tian Zhou - Drexel University
Shan Mei - Drexel University
Lin Han - Drexel Univ, Sch Biomed Engn Sci & Hlth Syst, Philadelphia, PA 19104 USA
Takeshi Higuchi - Tohoku University
Hiroshi Jinnai - Tohoku University
Christopher Y. Li - Drexel University
Publication Details
Nature communications, v 7(1), pp 10599-10599
Publisher
Springer Nature
Number of pages
6
Grant note
DMR-1308958 / Nationals Science Foundation
1308958 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS)
Resource Type
Journal article
Language
English
Academic Unit
School of Biomedical Engineering, Science, and Health Systems; Materials Science and Engineering
Web of Science ID
WOS:000371019700017
Scopus ID
2-s2.0-84957546984
Other Identifier
991019168251904721
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