Sodium silicate/polyurethane microcapsules synthesized for enhancing self-healing ability of cementitious materials: Optimization of stirring speeds and evaluation of self-healing efficiency

Beglarigale, Ahsanollah; Eyice, Doğa; Seki, Yoldaş; Yalçınkaya, Çağlar; Çopuroğlu, Oğuzhan; Yazıcı, Halit

doi:10.1016/j.jobe.2021.102279

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…[168] The addition of benzotriazole in nanofibers was the key factor that affected the mechanical properties of the coating. When Compressive test [152,155,156] the nanofibers broke, the released benzotriazole was adsorbed on the metal surface and formed a protective film, which further increased the corrosion resistance.…”

Section: Improvement Of the Mechanical Properties Of Composites For S...mentioning

confidence: 99%

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

Xia

Peng

et al. 2021

Polymer Engineering & Sci

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Electrospun nanofibers have promising properties and serve an important role in various applications ranging from biomedical engineering to mechanical engineering. Although electrospun nanofibers are not used worldwide, the limited research conducted thus far provides a rudimentary understanding of nanofibers and explores the potential areas that have attracted attention for commercialization. However, the lack of a comprehensive understanding of the properties of nanofibers in various applications severely limits their functionality. This review provides clear insights into modifying the morphology of nanofibers by adjusting various parameters to meet specific application requirements. Various applications, including membrane distillation, reinforcement, and self‐healing, and the corresponding desired properties are discussed in detail. Approaches for enhancing the application‐specific properties of electrospun nanofibers are also discussed. This discussion provides significant guidance for the design of novel electrospun composites with excellent properties. Finally, the challenges in research and the opportunities for future development are presented.

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Section: Improvement Of the Mechanical Properties Of Composites For S...mentioning

confidence: 99%

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

Xia

Peng

et al. 2021

Polymer Engineering & Sci

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“…Most microcapsules, however, are employed in a single setting. For example, a few experiments were conducted under standard curing conditions [ 42 ], while others were conducted under water curing conditions [ 43 ]. Since the self-healing effect of many microcapsules is tested under a specific healing condition, the self-healing effect in other circumstances is unknown.…”

Section: Introductionmentioning

confidence: 99%

Multiple Self-Healing Effects of Water-Absorbing Microcapsules in Cementitious Materials

Mao

Chen

et al. 2023

Polymers

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Concrete cracking has a negative impact on the durability of the structure. Pre-implanting microcapsules containing healing agents into the concrete are expected to induce the cracks to self-heal. However, the self-healing effect can potentially be influenced by several environmental conditions, thus limiting its applications. To address these challenges, we developed a new type of water-absorbing microcapsules, using calcium alginate hydrogel as the wall material and an adhesive epoxy polymer as the core material, to improve the self-healing adaptability in complex and changing environments. We explored the healing properties and mechanism of cementitious materials containing microcapsules under various environmental conditions. The experimental results showed that the water-absorbent microcapsules exhibit multiple self-healing effects under different external conditions: (1) in an anhydrous environment, fissures prompted the activation of microcapsules, and the epoxy polymer flowed out to seal the cracks. (2) When exposed to water, the microcapsules inflated to form a seal around the fissures. (3) The microcapsules facilitated the autogenous healing of cracks in the cementitious material when wet and dry conditions were alternated. The three self-healing mechanisms worked synergistically and contributed to the effective restoration of the impermeability and strength of concrete under different environments. Particularly, the recovery of compressive strength and impermeability exceeded 100% when the microcapsule content was 4% and the pre-pressure was 40% of fmax.

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“…In comparison to traditional cementitious matrices, capsule-based self-healing has a greater capacity for healing cracks [3] and may promote recovery in mechanical and transport properties [4,5]. Several protocols have been investigated to produce microcapsules, mainly focused on the encapsulation of specific healing agents, such as epoxy [6], sodium silicate [7,8] and bacterial spores [3]. Typical protocols to produce microcapsules involve the formation of emulsions followed by the deposition of a shell around the interface of droplets via processes such as coacervation [7], in situ [9], or interfacial [10] polymerisation.…”

Section: Introductionmentioning

confidence: 99%

Biobased Acrylate Shells for Microcapsules Used in Self-Healing of Cementitious Materials

Souza

Whitfield²,

Al‐Tabbaa

2022

Sustainability

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To facilitate the ongoing transition towards carbon neutrality, the use of renewable materials for additive manufacturing has become increasingly important. Here, we report for the first time the fabrication of microcapsules from biobased acrylate shells using microfluidics. To select the shell, a wide range of biobased acrylates disclosed in the literature was considered according to their tensile strength, ductile transition temperature and global availability. Once acrylate epoxidised soybean oil (AESO) was selected, its viscosity was adjusted to valuables suitable for the microfluidic device using two different diluting agents. Double emulsions were successfully produced using microfluidics, followed by photopolymerisation of the shell and characterisation of the capsules. Microcapsules containing AESO and isobornyl acrylate (IBOA) were produced with an outer diameter ~490 μm, shell thickness ranging between 36 and 67 μm, and production rates around 2.4 g/h. The mechanical properties of the shell were characterised as tensile strength of 29.2 ± 7.7 MPa, Young’s modulus of 1.7 ± 0.4 GPa and the ductile transition temperature was estimated as 42 °C. To investigate physical triggering, microcapsules produced with a size of 481 ± 4 μm and with a measured shell thickness around 6 μm were embedded in the cementitious matrix. The triggered shells were observed with scanning electron microscopy (SEM) and the uniform distribution of the capsules in cement paste was confirmed using X-ray computed tomography (XCT). These advances can facilitate the wide application of biobased resins for the fabrication of microcapsules for self-healing in cementitious materials.

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Sodium silicate/polyurethane microcapsules synthesized for enhancing self-healing ability of cementitious materials: Optimization of stirring speeds and evaluation of self-healing efficiency

Cited by 11 publications

References 32 publications

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

Multiple Self-Healing Effects of Water-Absorbing Microcapsules in Cementitious Materials

Biobased Acrylate Shells for Microcapsules Used in Self-Healing of Cementitious Materials

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