The design of wrinkled microcapsules for enhancement of release rate

Ina, Maria; Zhushma, Aleksandr P.; Лебедева, Н. В.; Vatankhah‐Varnoosfaderani, Mohammad; Olson, Sean D.; Sheiko, Sergei S.

doi:10.1016/j.jcis.2016.06.022

Cited by 27 publications

(22 citation statements)

References 34 publications

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“…The wrinkling of the microcapsule shell occurred likely due to the leakage of solvent from the core of the microcapsules (M10 and M30) during the microcapsule drying process that increased surface-to-volume ratio of microcapsules. 40 This effect is pronounced at higher solvent contents since as wt% of BA increased, the concentration gradient and hence the driving force for BA transfer across the microcapsule shell also increased, resulting in a greater loss of BA and hence a greater degree of wrinkling of microcapsule shell. This phenomenon can improve the mechanical interlocking between microcapsules and the polymeric coating and enhance the mechanical properties of the self-repairing material.…”

Section: Shape Morphology Size and Size Distribution Of Synthesimentioning

confidence: 99%

“…Microcapsule size significantly influences its self-healing performance since the quantity of repairing material available for release depends on the size of microcapsules. [40][41][42] Earlier studies have shown that a balance of self-healing and mechanical properties can be achieved by optimizing microcapsule size and wt% in the coating formulation. 41,42 It is recommended that the size of the microcapsule should be preferably smaller than the coating thickness.…”

Section: Shape Morphology Size and Size Distribution Of Synthesimentioning

confidence: 99%

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Development of self‐healing coatings based on urea‐formaldehyde/polyurethane microcapsules containing epoxy resin

Parsaee

Mirabedini

Farnood

et al. 2020

J of Applied Polymer Sci

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In this study, the synthesis of urea‐formaldehyde/polyurethane (UF/PU) microcapsules containing epoxy resin for self‐healing and anti‐corrosion coatings with good stability has been reported. Spherical microcapsules were prepared with a diameter of about 50–720 μm and a shell thickness of 0.6–0.7 μm via in situ polymerization in an oil‐in‐water emulsion using 2,4‐toluene diisocyanate‐based pre‐polymer along with the urea‐formaldehyde. Scanning electron microscopy (SEM) and optical microscopy (OM) were employed to evaluate the shape and morphology of the microcapsules. Fourier transform infrared (FTIR) spectroscopy showed the absence of free isocyanate groups within the microcapsule shell confirming the completion of shell formation reactions. OM illustrated that the microcapsules were stable over a period of 30‐days in toluene and xylene. Increasing microcapsule loading improved crack repairing and anti‐corrosion performance of the coating layer. Low‐carbon steel coupons coated with an epoxy resin containing 10 wt% microcapsules and scribed using a scalpel blade showed no visible sign of corrosion after up to 5 weeks of exposure in a standard salt spray test chamber.

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Section: Shape Morphology Size and Size Distribution Of Synthesimentioning

confidence: 99%

Section: Shape Morphology Size and Size Distribution Of Synthesimentioning

confidence: 99%

Development of self‐healing coatings based on urea‐formaldehyde/polyurethane microcapsules containing epoxy resin

Parsaee

Mirabedini

Farnood

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Feng et al fabricated wrinkled protein microcapsules by protein secondary structure and pointed out that wrinkled microcapsules have enhanced adhesion propensity and release profiles, which could be beneficial for food‐related applications and improve the bioavailability of encapsulated compounds by promoting their attachment to epithelium. Ina et al have shown that by adjusting the amount of wrinkles in the layers, the surface to volume ratio changed, effecting the release rate of the entrapped cargo.…”

Section: Introductionmentioning

confidence: 99%

“…Initially, researchers study the wrinkles of microcapsules mainly for the sake of understanding the rheological properties of cells, but in recent years, more and more attention has been paid to studying the mechanism of wrinkles formation as well as the design and controllable adjustment of wrinkles . Ina et al designed a thermally expandable microcapsule, which had wrinkled shell by one‐step suspension polymerization. They explained that the main cause of wrinkle formation is the condensation of volatile core component inside the in inflated microcapsule.…”

Section: Introductionmentioning

confidence: 99%

Controllable Enhancement of Capsule‐Membrane Wrinkles by Flow Shear and Preparation of Double‐Layer Polyamide Microcapsules

Hadji

Shi

et al. 2019

ChemistrySelect

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Monodisperse wrinkled polyamide microcapsules with a size of 480 μm‐750 μm are prepared by tubular microfluidics. The wrinkling, which results from the combined action of heterogeneous interface polymerization and shearing force, can be measured and calculated by solvent soaking. Controllable enhancement of capsule‐membrane wrinkles could be achieved by increasing flow rate or viscosity of the fluid in microchannels. In addition, double‐layer polyamide microcapsules were prepared by taking use of the permeability and the wrinkle morphology of the microcapsule membrane. The double shells of polyamide microcapsules were synthesized by two steps: (i) interface polymerization in continuous microfluidics for the first shell and (ii) wet chemical synthesis for the second shell. The double‐layer polyamide microcapsules have better strength than simple polyamide microcapsules during drying testing and the water inside the double‐layer polyamide microcapsules can be released and absorbed repeatedly. Therefore, the double‐layer polyamide microcapsules can be used as the carrier of both the hydrophilic ingredient and hydrophobic ingredient. The results obtained in this paper will have some potential applications in some fields like printing, dyeing and drug delivery.

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“…Release profiles of MCs in conventional systems have often been regulated by the membrane thickness, particle size, pore size, membrane permeability or stimuli-gated channels (Siepmann and Siepmann, 2012 ; Jeong et al, 2014 ; Zhang et al, 2014 , 2018b ; Shi et al, 2016 ; Cui et al, 2017 ; Huang et al, 2017 ). The fabrication of wrinkled MCs is another important strategy for increasing the surface area of the membrane, but little progress was observed in terms of the release rate (Ina et al, 2016 ). MCs prepared with coordination complexes were reported to degrade faster and the release of core materials was pH-responsive (Ejima et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Easily Tunable Membrane Thickness of Microcapsules by Using a Coordination Assembly on the Liquid-Liquid Interface

Liu

et al. 2018

Front. Chem.

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A model solvent, 1,3,5-trimethylbenzene, was encapsulated using coordination assembly between metal ions and tannic acid to reveal the deposition of coordination complexes on the liquid-liquid interface. The deposition was confirmed by zeta potential, energy dispersive spectroscopy and X-ray photoelectron spectroscopy. Scanning electron microscopy and transmission electron microscopy were integrated to characterize the microcapsules (MCs). According to atomic force microscopy height analysis, membrane thickness of the MCs increased linearly with sequential deposition. For MCs prepared using the Fe3+-TA system, the average membrane thicknesses of MCs prepared with 2, 4, 6, and 8 deposition cycles were determined as 31.3 ± 4.6, 92.4 ± 15.0, 175.4 ± 22.1, and 254.8 ± 24.0 nm, respectively. Dissolution test showed that the release profiles of all the four tested MCs followed Higuchi kinetics. Membrane thicknesses of MCs prepared using the Ca2+-TA system were much smaller. We can easily tune the membrane thickness of the MCs by adjusting metal ions or deposition cycles according to the application requirements. The convenient tunability of the membrane thickness can enable an extensive use of this coordination assembly strategy in a broad range of applications.

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The design of wrinkled microcapsules for enhancement of release rate

Cited by 27 publications

References 34 publications

Development of self‐healing coatings based on urea‐formaldehyde/polyurethane microcapsules containing epoxy resin

Development of self‐healing coatings based on urea‐formaldehyde/polyurethane microcapsules containing epoxy resin

Controllable Enhancement of Capsule‐Membrane Wrinkles by Flow Shear and Preparation of Double‐Layer Polyamide Microcapsules

Easily Tunable Membrane Thickness of Microcapsules by Using a Coordination Assembly on the Liquid-Liquid Interface

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