Transparent Organic–Inorganic Nanocomposite Coatings

Zhou, Shuxue; Wu, Limin

doi:10.1002/9781118883051.ch1

Cited by 5 publications

(4 citation statements)

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“…The silica nanocapsules under dark condition (In-SNCs-77-D) showed a sustained release of fipronil with 87.1 ± 1.4% of the fipronil remaining inside the nanocapsules at 72 h. In contrast, the concentration of fipronil inside the silica nanocapsules under light (In-SNCs-77-L) decreased more rapidly (i.e., 61.5 ± 1.0% at 72 h). This result indicated that the silica shell provided a certain level of protection against light degradation, as silica is optically transparent, and the protection efficacy was around 70.6% (= 61.5/87.1). Figure B shows the variation of the C e / C 0 (i.e., the ratio of the fipronil concentration in the external buffer solution to the initial concentration) under both dark and light conditions over a 72 h period.…”

Section: Resultsmentioning

confidence: 97%

“…The concentrations of fipronil inside the silica nanocapsules were calculated and compared under light exposure and dark condition to determine whether fipronil inside the nanocapsules remained intact.Figure 8Ashows the variation of Ci/C0 (i.e., the ratio of the fipronil concentration inside the silica nanocapsules to its initial concentration) under simulated light and dark conditions over a 72-h period. The silica nanocapsules under dark condition (In-SNCs-77-D) showed a sustained release of fipronil with 87.1 ± 1.4% of the fipronil remained inside the nanocapsules at 72 h. In contrast, the concentration of fipronil inside the silica nanocapsules under light (In-SNCs-77-L) decreased more rapidly i.e., 61.5 ± 1.0% at 72 h. This result indicated that the silica shell provided certain level of protection against light degradation, as silica is optically transparent,49 and the protection efficacy was around 70.6% (=61.5/87.1).Figure 8Bshows the variation of the Ce/C0 (i.e., the ratio of the fipronil concentration in the external buffer solution to the initial concentration) under both dark and light conditions over a 72-h period. It is clear that fipronil was released gradually from the silica nanocapsules that incubated under dark condition (Ex-SNCs-77-D).…”

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confidence: 94%

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Biomimetic Silica Nanocapsules for Tunable Sustained Release and Cargo Protection

et al. 2017

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Silica nanocapsules have attracted tremendous interest for encapsulation, protection, and controlled release of various cargoes due to their unique hierarchical core-shell structure. However, it remains challenging to synthesize silica nanocapsules having high cargo-loading capacity and cargo-protection capability without compromising process simplicity and biocompatibility properties. Here, we synthesized oil-core silica-shell nanocapsules under environmentally friendly conditions by a novel emulsion and biomimetic dual-templating approach using a dual-functional protein, in lieu of petrochemical surfactants, thus avoiding the necessities for the removal of toxic components. A light- and pH-sensitive compound can be facilely encapsulated in the silica nanocapsules with the encapsulation efficiency of nearly 100%. Release of the encapsulated active from the nanocapsules was not shown an indication of undesired burst release. Instead, the release can be tuned by controlling the silica-shell thicknesses (i.e., 40 and 77 nm from which the cargo released at 42.0 and 31.3% of the initial amount after 32 days, respectively). The release kinetics were fitted well to the Higuchi model, enabling the possibility of the prediction of release kinetics as a function of shell thickness, thus achieving design-for-purpose silica nanocapsules. Furthermore, the nanocapsules showed excellent alkaline- and sunlight-shielding protective efficacies, which resulted in significantly prolonged half-life of the sensitive cargo. Our biomimetic silica nanocapsules provide a nanocarrier platform for applications that demand process scalability, sustainability, and biocompatibility coupled with unique cargo-protection and controlled-release properties.

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Section: Resultsmentioning

confidence: 97%

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confidence: 94%

Biomimetic Silica Nanocapsules for Tunable Sustained Release and Cargo Protection

et al. 2017

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“…Studies of surface adsorption of γ-glycidoxypropyltrimethoxysilane (GPTMS) on colloidal silica have been done in alcohol-based systems under mildly alkaline conditions in the past and have been reported to enhance mechanical properties of coatings besides its stability in many reactive systems (Bagwe et al , 2006; Bjorkegren et al , 2015; Zhou and Wu, 2015). Meanwhile, the application of this technology in corrosion protection has been reported (Gao et al , 2012, 2009; Ralf and Ulrich, 2007; Wang et al , 2011), but its use for colouring aluminium pigment with reactive dyes has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Coloration of aluminum pigment using SiO₂ and γ-glycidoxypropyltrimethoxysilane with dichlorotriazine reactive dye

Tawiah

Zhang

Tian

et al. 2016

PRT

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Purpose The purpose of this paper is to colour aluminium pigment to the highest chroma using SiO2 and organic silane with dichlorotriazine reactive dye and investigate its reaction mechanism, chemical stability and thermal properties to improve its applicability in surface coatings. Design/methodology/approach Aluminium pigment was encapsulated by the catalysed sol-gel method using SiO2, followed by modification with γ-glycidoxypropyltrimethoxysilane (GPTMS). Purified reactive dye (1-Amino-4-[3-(4,6-dichlorotriazin-2-ylamino)-4-sulfophenylamino]anthraquinone-2-sulfonic acid (X-BR)) was covalently immobilized onto modified SiO2 to obtain coloured aluminium pigment. The reaction mechanism, chemical stability and thermophysical properties were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscope, transmission electron microscope and thermogravimetric analyses (TGA). Findings The results showed that X-BR was covalently attached to modified Al/SiO2 with maximum colour grafting of 95 per cent when the dosage of GPTMS and X-BR per weight of modified Al/SiO2 was 25 and 15 per cent, respectively, at pH 8.5 and a temperature of 40°C. The coloured aluminium pigment had good chemical stability with excellent anti-migration properties in many solvents. Research limitations/implications The organic silane used required a careful control of pH to ensure maximum colour grafting efficiency meanwhile other silanes with amine groups could also be used effectively with different kinds of colorants besides reactive dyes. Practical implications The method used is less cumbersome and provides a simple route to preparing coloured aluminium pigment. Originality/value The use of organic-inorganic SiO2/γ- GPTMS with purified reactive dye to covalently colour aluminium pigment to the highest chroma is novel and will help advance the frontiers of knowledge on coloration of aluminium pigments.

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“…However, when the aqueous nanocomposite resins are drying, the compatibility between the polymer chains and the inorganic nanofiller dominates the dispersion state of the nanofillers. Poor compatibility generally leads to aggregates of such nanofillers during drying [37].…”

Section: Introductionmentioning

confidence: 99%

Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

et al. 2018

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Abstract:The application of coating polymers to building materials is a simple and cheap way to preserve and protect surfaces from weathering phenomena. Due to its environmentally friendly character, waterborne coating is the most popular type of coating, and improving its performance is an important key of research. The study presents the results regarding the mechanical and photo-oxidation resistance of some water-based acrylic coatings containing SiO 2 nanoparticles obtained by batch miniemulsion polymerization. Coating materials have been characterized in terms of hydrophobic/hydrophilic behavior, mechanical resistance and surface morphology by means of water-contact angle, and scrub resistance and atomic force microscopy (AFM) measurements depending on silica-nanoparticle content. Moreover, accelerated weathering tests were performed to estimate the photo-oxidation resistance of the coatings. The chemical and color changes were assessed by Fourier-transform infrared spectroscopy (FTIR) and colorimetric measurements. Furthermore, the nanofilled coatings were applied on two different calcareous lithotypes (Lecce stone and Carrara Marble). Its properties, such as capillary water absorption and color modification, before and after accelerated aging tests, were assessed. The properties acquired by the addition of silica nanoparticles in the acrylic matrix can ensure good protection against weathering of stone-based materials.

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Transparent Organic–Inorganic Nanocomposite Coatings

Cited by 5 publications

References 189 publications

Biomimetic Silica Nanocapsules for Tunable Sustained Release and Cargo Protection

Biomimetic Silica Nanocapsules for Tunable Sustained Release and Cargo Protection

Coloration of aluminum pigment using SiO₂ and γ-glycidoxypropyltrimethoxysilane with dichlorotriazine reactive dye

Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

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Transparent Organic–Inorganic Nanocomposite Coatings

Cited by 5 publications

References 189 publications

Biomimetic Silica Nanocapsules for Tunable Sustained Release and Cargo Protection

Biomimetic Silica Nanocapsules for Tunable Sustained Release and Cargo Protection

Coloration of aluminum pigment using SiO2 and γ-glycidoxypropyltrimethoxysilane with dichlorotriazine reactive dye

Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

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Coloration of aluminum pigment using SiO₂ and γ-glycidoxypropyltrimethoxysilane with dichlorotriazine reactive dye