The effect of silica nanocapsules on self-healing concrete

Oliveira, Tassiane Apolinário de; Bragança, Mariana D'Orey Gaivão Portela; Pinkoski, Igor Miguel; Carrera, Gilberto

doi:10.1016/j.conbuildmat.2021.124010

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…Indeed, the protective efficiency of polymer coatings can be improved by embedding smart systems containing corrosion inhibitors, which can be released on demand. , That is, properly designed nanoparticles, such as silica nanoparticles and nanocapsules, are used as nanocarriers of corrosion inhibitors or self-healing agents, which are unloaded or released under appropriate external stimuli. In fact, nanocarriers have the advantage of being able to load high amounts of inhibitors, also shielding them by UV-induced deactivation and modulating their release. − …”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Mesoporous Silica Nanoparticles Functionalized with Benzoyl Chloride in pH-Responsive Anticorrosion Polymer Coatings

Olivieri

Scherillo

Castaldo

et al. 2023

ACS Appl. Polym. Mater.

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Smart polymer coatings embedding stimuli-responsive corrosion inhibitor nanocarriers are commonly exploited, in the literature, for the development of high-performance active coatings. In this work, high-surface-area amino-functionalized mesoporous silica nanoparticles (MSN-NH2) were developed with a one-step synthesis process and then functionalized with benzoyl chloride (MSN-BC) through a reaction with amino groups. MSN-BC are able to release benzoic acid (BA) in acid and alkaline conditions as a result of the hydrolysis of the pH-sensitive amide bond. MSN-BC were embedded in polymer coatings to exploit the pH-dependent release of corrosion-inhibiting BA. After an in-depth characterization of the developed functional nanoparticles and of their pH-dependent release kinetics of BA, MSN-BC were embedded in an acrylic matrix, realizing coatings for the corrosion protection of aluminum AA2024 alloys. Results demonstrate the effectiveness of the nanoparticles’ porous structure for a high loading of the anticorrosive active agent BA and the long-lasting efficiency of the coating for the corrosion protection of aluminum alloys, as validated by morphological and electrochemical impedance spectroscopy (EIS) measurements. EIS experiments were carried out with up to 21 days of exposure to a corrosive environment, revealing the potentialities of the acrylic coatings embedding MSN-BC for the protection of aluminum alloys.

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Section: Introductionmentioning

confidence: 99%

Effectiveness of Mesoporous Silica Nanoparticles Functionalized with Benzoyl Chloride in pH-Responsive Anticorrosion Polymer Coatings

Olivieri

Scherillo

Castaldo

et al. 2023

ACS Appl. Polym. Mater.

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“…Concrete as a construction material is widely used due to its high strength, low cost and good durability (Wang et al, 2021). However, the disadvantages of low relative tensile strength and poor crack resistance (Chahal et al, 2012b) make concrete inevitably cracks because of shrinkage, temperature gradient and external load (Tittelboom et al, 2010;Oliveira et al, 2021;Wu et al, 2020). The appearance of cracks affects the integrity and functionality of the concrete structure.…”

Section: Introductionmentioning

confidence: 99%

“…, 2012b) make concrete inevitably cracks because of shrinkage, temperature gradient and external load (Tittelboom et al. , 2010; Oliveira et al. , 2021; Wu et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Statistical and experimental study on microcrack of mortar by a self-healing agent of bacteria adsorbed by expanded perlite

Li,

Sun,

Wang

et al. 2023

MMMS

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PurposeThe purpose of this paper is to add expanded perlite (EP) immobilized microorganisms that replace part of the standard sand in mortar to improve the self-healing ability of mortar cracks and reduce the water absorption of mortar after healing.Design/methodology/approachBacillus pseudofirmus spores were immobilized with EP particles as self-healing agents. The effects of adding self-healing agents on the compressive strength of mortar specimens were observed. The ability of mortar specimens to heal cracks was evaluated using crack microscopic observation and water absorption experiments. The filler at the cracks was microscopically analyzed by scanning electron microscope and X-ray diffraction experiments.FindingsFirst, the internal curing effect of EP promotes the hydration of cement in mortar, which generates more amount and denser crystal structure of Ca(OH)2 at mortar cracks and improves the self-healing ability of mortar. Second, the self-healing ability of mortar improves with the increase of self-healing agent admixture. Adding a self-healing agent of high admixture makes the planar undulation of calcite crystal accumulation at mortar cracks more significant. Finally, the initial crack widths that can be completely healed by adding EP and self-healing agents to the mortar are 200 µm and 600 µm, respectively.Originality/valueThe innovation points of this study are as follows. (1) The mechanism of the internal curing effect of EP particles on the self-healing ability of mortar cracks was revealed by crack microscopic observation tests and microscopic experiments. (2) The effect of different self-healing agent amounts on the self-healing ability of mortar cracks has been studied. (3) The effects of EP particles and self-healing agents on healing different initial widths were elucidated by crack microscopic observation tests.Graphical abstract

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Development of a novel compressed tablet-based bacterial agent for self-healing cementitious material

Son

Min

Jang

et al. 2022

Cement and Concrete Composites

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The effect of silica nanocapsules on self-healing concrete

Cited by 12 publications

References 34 publications

Effectiveness of Mesoporous Silica Nanoparticles Functionalized with Benzoyl Chloride in pH-Responsive Anticorrosion Polymer Coatings

Effectiveness of Mesoporous Silica Nanoparticles Functionalized with Benzoyl Chloride in pH-Responsive Anticorrosion Polymer Coatings

Statistical and experimental study on microcrack of mortar by a self-healing agent of bacteria adsorbed by expanded perlite

Development of a novel compressed tablet-based bacterial agent for self-healing cementitious material

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