Encapsulation and Enhanced Retention of Fragrance in Polymer ...
Supporting Information for ACS Appl. Mater. Interfaces
Encapsulation and Enhanced Retention of Fragrance in Polymer Microcapsules Hyomin Lee, a, ‡ Chang-Hyung Choi,a, ‡ Alireza Abbaspourrad,b Chris Wesner,c Marco Caggioni,c Taotao Zhu,c and David A. Weitza,* a
School of Engineering and Applied Sciences and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States b
c
Department of Food Science, Cornell University, Ithaca, New York 14853, United States
Corporate Engineering, The Procter & Gamble Company, Cincinnati, Ohio 45069, United States
*
Corresponding Author Email: [email protected]
‡
These authors contributed equally.
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Figure S1. Optical microscope image showing off-centered microcapsules with very thin shell on one side. Scale bar represents 200 µm.
Figure S2. Optical microscope images of microcapsules before and after tilting the capsule dispersion media. Both capsules are left stagnant in DI water for a day before tilting. (a) Without a hydrogel network. (b) With a hydrogel network.
To validate the hypothesis that the density mismatch within the performed F/W emulsion phase (ρα-pinene ~ 0.86 and ρ5% PVA = ~1.02) promotes leakage because the α-pinene drops can rise due to buoyancy and directly contact the inner surface of the capsule shell, we prepare two sets of microcapsules with and without a hydrogel network and visually monitor the capsule interior before and after tilting the capsule dispersion media; both capsules are left stagnant in DI water for a day prior to tilting. We find that microcapsules with a hydrogel network have no visual difference upon tilting the dispersion media, indicating that the hydrogel network locks the position of the individual α-pinene drops and keeps them uniformly distributed within the microcapsule. By contrast, for microcapsules without a hydrogel network, we observe that the α-
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pinene drops are positioned in one side when particles are temporarily tilted as shown in the optical microscope images of Supporting Information Figure S2.
Figure S3. Graph showing the absorbance versus time for ETPTA microcapsules with different concentration of PEG-DA in the aqueous phase of F/W emulsion.
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Encapsulation and Enhanced Retention of Fragrance in Polymer Microcapsules Hyomin Lee, a, ‡ Chang-Hyung Choi,a, ‡ Alireza Abbaspourrad,b Chris Wesner,c Marco Caggioni,c Taotao Zhu,c and David A. Weitza,* a
School of Engineering and Applied Sciences and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States b
c
Department of Food Science, Cornell University, Ithaca, New York 14853, United States
Corporate Engineering, The Procter & Gamble Company, Cincinnati, Ohio 45069, United States
*
Corresponding Author Email: [email protected]
‡
These authors contributed equally.
S1
Figure S1. Optical microscope image showing off-centered microcapsules with very thin shell on one side. Scale bar represents 200 µm.
Figure S2. Optical microscope images of microcapsules before and after tilting the capsule dispersion media. Both capsules are left stagnant in DI water for a day before tilting. (a) Without a hydrogel network. (b) With a hydrogel network.
To validate the hypothesis that the density mismatch within the performed F/W emulsion phase (ρα-pinene ~ 0.86 and ρ5% PVA = ~1.02) promotes leakage because the α-pinene drops can rise due to buoyancy and directly contact the inner surface of the capsule shell, we prepare two sets of microcapsules with and without a hydrogel network and visually monitor the capsule interior before and after tilting the capsule dispersion media; both capsules are left stagnant in DI water for a day prior to tilting. We find that microcapsules with a hydrogel network have no visual difference upon tilting the dispersion media, indicating that the hydrogel network locks the position of the individual α-pinene drops and keeps them uniformly distributed within the microcapsule. By contrast, for microcapsules without a hydrogel network, we observe that the α-
S2
pinene drops are positioned in one side when particles are temporarily tilted as shown in the optical microscope images of Supporting Information Figure S2.
Figure S3. Graph showing the absorbance versus time for ETPTA microcapsules with different concentration of PEG-DA in the aqueous phase of F/W emulsion.
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