Synthesis and characterisation of robust emulsion-templated silica microcapsules

Meaney, Shane P.; Tabor, Rico F.; Follink, Bart

doi:10.1016/j.jcis.2017.06.026

Cited by 14 publications

(12 citation statements)

References 40 publications

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“…Mesostructured silica/organic hybrid materials are of great interest in wide range of applications such as adsorbents, [18] encapsulation systems, [19] fillers to enhance the mechanical properties of composites, [20] and hard templates for further synthesis of anisotropic nanomaterials. [21] Hence, in order to tune the properties of the final hybrid materials, it is important to prove that the bottom-up silica/dye co-assembly method for material preparation is versatile and can be used with various types of dyes.…”

Section: Introductionmentioning

confidence: 99%

Chromonic self-assemblies in a series of dialkyl-thiacarbocyanine dyes and generalization of a facile route for the synthesis of fluorescent nanostructured silica fibers

Magana

Solans

Salonen³

et al. 2018

Journal of the Taiwan Institute of Chemical Engineers

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Section: Introductionmentioning

confidence: 99%

Chromonic self-assemblies in a series of dialkyl-thiacarbocyanine dyes and generalization of a facile route for the synthesis of fluorescent nanostructured silica fibers

Magana

Solans

Salonen³

et al. 2018

Journal of the Taiwan Institute of Chemical Engineers

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“…Xue et al [14] prepared a hybrid material of polylactic acid-glycolic acid copolymer/mesoporous silica, and the mesoporous silica enabled the sustained release of the loaded gentamicin for more than 20 days. Shane et al [15] used the emulsion template method to synthesize silica microcapsules, and found that adding a small amount of the silica precursor tetraethyl orthosilicate (TEOS) multiple times was more conducive to achieving sustained-release of the microcapsules. The uniform pore size of mesoporous silica makes it a highly efficient carrier; this is because its high pore volume enables high drug loading and entrapping [16].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Long-Term Antibacterial SiO2-Cinnamaldehyde Microcapsule via Sol-Gel Approach as a Functional Additive for PBAT Film

Huang

Dang

et al. 2020

Processes

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The mesoporous silica wall materials can achieve controlled load and sustained-release of active agents. An antimicrobial nanoscale silica microcapsule containing cinnamaldehyde (CA) was prepared by the sol-gel method and applied in poly (butyleneadipate-co-terephthalate) (PBAT) film. The surface morphology, physical and chemical properties, and antibacterial properties of microcapsules and films were studied. The effects of different temperatures and humidities on the release behavior of microcapsules were also evaluated. Results showed that CA was successfully encapsulated in silica microcapsule which had a diameter of 450–700 nm. The antibacterial CA agent had a long-lasting release time under lower temperature and relative humidity (RH) environment. At low temperature (4 °C), the microcapsules released CA 32.35% in the first 18 h, and then slowly released to 56.08% in 216 h; however, the microcapsules released more than 70% in 18 h at 40 °C. At low humidity (50%RH), the release rates of microcapsules at the 18th h and 9th d were 43.04% and 78.01%, respectively, while it reached to equilibrium state at 72 h under 90% RH. The sustained release process of CA in SiO2-CA microcapsules follows a first-order kinetic model. Physicochemical properties of PBAT films loaded with different amounts of microcapsules were also characterized. Results showed that the tensile strength and water vapor transmission rate (WVTR) of the composite film containing 2.5% microcapsules were increased by 26.98% and 14.61%, respectively, compared to the raw film, while the light transmittance was slightly reduced. The crystallinity of the film was improved and can be kept stable up to 384.1 °C. Furthermore, microcapsules and composite film both exhibited distinctive antibacterial effect on Escherichia coli and Listeria monocytogenes. Therefore, SiO2-CA microcapsules and composite films could be a promising material for the active packaging.

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“…A pure SiO 2 shell was initially used to encapsulate PEA; however, we found it was not dense enough to achieve the stable encapsulation of PEA without leakage. The possible reason for this is that the thin silica shell isolated the unreactive silicon source in the oil phase from the aqueous phase, which prevented further hydrolytic condensation of the silicon source . To solve this problem, we designed a hybrid shell to encapsulate PEA.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The possible reason for this is that the thin silica shell isolated the unreactive silicon source in the oil phase from the aqueous phase, which prevented further hydrolytic condensation of the silicon source. 39 To solve this problem, we designed a hybrid shell to encapsulate PEA. Reactive monomer TMPTA was also added to the oil phase and underwent cross-linking under UV irradiation to form a pTMPTA shell, which combined with the preformed SiO 2 shell to generate a hybrid shell with good mechanical stability and penetration resistance.…”

Section: Resultsmentioning

confidence: 99%

Robust Damage-Reporting Strategy Enabled by Dual-Compartment Microcapsules

Chen

Luo

et al. 2021

ACS Appl. Mater. Interfaces

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Dye-filled microcapsules are an attractive way to identify microscopic damage of materials by the naked eye. However, there are many disadvantages in traditional microcapsule-based self-reporting materials, such as a poor self-reporting effect. A new concept for the design of self-reporting microcapsules is presented here. Our work develops a novel kind of dualcompartmental microcapsule via Pickering emulsion photopolymerization, which can encapsulate two interacting species ("pro-dye" and "developer") separately in a single microcapsule. In our strategy, SiO 2 microspheres encapsulating polyetheramine (PEA, developer) were first prepared and employed as a Pickering emulsifier to stabilize oil-in-water emulsions, in which the oil phase consisted of 2′,7′-dichlorofluorescein (DCF, pro-dye) and a monomer. After the monomer polymerization, a dual-compartment microcapsule, which encapsulated the pro-dye in the core and the developer in the shell, was obtained. Upon the rupture of the microcapsule, the pro-dye and the developer were released simultaneously and reacted to yield a pronounced chromogenic response. Compared with traditional double-microcapsule systems, this dual-compartment microcapsule system demonstrated a more efficient and pronounced self-reporting effect. This is the first time that a double-encapsulation scheme involving the compartmentalized release of two interacting species within a single microcapsule has been demonstrated for self-reporting, which overcomes the tough problems of the uneven distribution of the traditional doublemicrocapsule systems.

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Synthesis and characterisation of robust emulsion-templated silica microcapsules

Cited by 14 publications

References 40 publications

Chromonic self-assemblies in a series of dialkyl-thiacarbocyanine dyes and generalization of a facile route for the synthesis of fluorescent nanostructured silica fibers

Chromonic self-assemblies in a series of dialkyl-thiacarbocyanine dyes and generalization of a facile route for the synthesis of fluorescent nanostructured silica fibers

Preparation of Long-Term Antibacterial SiO2-Cinnamaldehyde Microcapsule via Sol-Gel Approach as a Functional Additive for PBAT Film

Robust Damage-Reporting Strategy Enabled by Dual-Compartment Microcapsules

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