Fabrication of Microcapsules with Special Shapes by Layer-by-layer Assembly on CaCO3 Microparticles†

doi:10.7503/cjcu20170416

Abstract

Abstract:

Biconvex platelet-like and spindle-like calcium carbonate particles were prepared by mixing Na₂CO₃ and CaCl₂ solutions in the presence of poly(allylamine hydrochloride)(PAH) under magnetic stirring and ultrasound treatment, respectively. The platelet-like CaCO₃ particles were vaterites, while the spindle-like ones were mainly aragonites. These two kinds of particles were both doped with small amount of PAH. The formation of CaCO₃ particles with specific shapes was due to the synergistic effect of mixing method and PAH additives. Then platelet-like and spindle-like polyelectrolyte multilayer microcapsules were fabricated via layer-by-layer(LbL) assembly method using the CaCO₃ particles with corresponding shape as templates. The fabricated micrcapsules could be well dispersed in aqueous medium and maintain their original shapes.

Key words: CaCO3 microparticle, Platelet-like microcapsule, Spindle-like microcapsule, Layer-by-layer assembly

CLC Number:

O631

TrendMD:

YANG Hui, LI Tong, TONG Weijun, GAO Changyou. Fabrication of Microcapsules with Special Shapes by Layer-by-layer Assembly on CaCO₃ Microparticles^†[J]. Chem. J. Chinese Universities, 2018, 39(1): 172.

Figures/Tables 5

Fig.1 SEM images of the platelet-like particles(A, B) and the spindle-like particles(C, D)(B) and (D) are the enlarged parts indicated by the rectangles in (A) and (C), respectively.

Fig.2 TEM images of platelet-like(A) and spindle-like(B) particles and SAED of the whole platelet-like particles(C) and the marked area of spindle-like particles in image (B)(D)

Fig.3 XRD patterns of platelet-like(a) and spindle-like(b) particles(A) and FTIR spectra of PAH(a), platelet-like(b) and spindle-like(c) particles(B)Diffraction peaks of vaterite, calcite and aragonite are labeled as “V”, “C” and “A”, respectively.

Fig.4 TGA analyses of platelet-like(a) and spindle-like(b) particles

Fig.5 SEM(A, D), TEM(B, E) and CLSM(C, F) images of platelet-like(PAH/GA)10/gelatin microcapsules(A—C) and spindle-like(BSA/PEI)5 microcapsules(D—F)Inset in (A) is the SEM images of platelet-like microcapsules dried using the critical point drying(CPD) method, while the other capsules observed by SEM and TEM were dried in air. Microcapsules in (C) and (F) labeled by RBITC and FITC, respectively.

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Fabrication of Microcapsules with Special Shapes by Layer-by-layer Assembly on CaCO₃ Microparticles^†

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