Flame retardant and hydrophobic coatings on cotton fabrics via sol-gel and self-assembly techniques

Zhang, Dongqiao; Williams, Brandon L.; Shrestha, Saral B.; Nasir, Zain; Becher, Elaina M.; Lofink, Benjamin J.; Santos, Victor Hugo; Patel, H. M.; Peng, Xiaohong; Sun, Luyi

doi:10.1016/j.jcis.2017.06.087

Cited by 147 publications

(53 citation statements)

References 50 publications

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“…The improved hydrophobicity could be given by the surface roughening effect, due to the presence of NPs dispersed within ceramer network, as shown by FESEM images in Figure 4. Moreover, as reported in literature, the presence of an extended and uniform siloxane (-Si-O-Si-) network, formed by hydrolysis and condensation of different silica precursors, increases the surface hydrophobicity [51,52]. As reported in Table 4, the contact angle results confirmed that TMEOS (CERTi4 and CERTi8 samples) is the more suitable alkoxysilane precursor for the proposed design strategy, improving the A deeper analysis of the ceramer functional groups was made by FTIR spectroscopy [49,50], with the resulting spectra being reported in Figure 4b.…”

Section: Ceramer Coatingmentioning

confidence: 63%

Insulating Thermal and Water-Resistant Hybrid Coating for Fabrics

Ortelli

Costa

2020

Coatings

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Organic–inorganic hybrid (ceramer) coatings were synthesized and deposited on the polyester nonwoven fabrics through the sol–gel process. This promoted the formation of an insulating barrier that was able to enhance the thermal stability and the hydrophobicity of fabrics. The hybrid phase is made of an organic network arising from different alkoxysilane precursors (trimethoxymethylalkoxysilane (TMEOS), 3-aminopropyl-trimethoxyalkoxysilane (APTMS), and tetraethylorthosilicate (TEOS)) and inorganic phase made of titanium dioxide TiO2 nanoparticles (NPs) and, in some cases, coated by P-based compound. The characterization of hybrid phase at liquid (size distribution and zeta potential of dispersed nanoparticles), dried state (crystalline phase, thermogravimetric (TGA), and Fourier transform infrared spectroscopic (FTIR) analyses), and on deposited coatings (contact angle, burn-out tests) aimed to find a correlation between the physicochemical properties of ceramer and functional performances of coated fabrics (thermal stability and hydrophobicity). The results showed that all ceramer formulations were able to improve the char formation after burn-out, in particular the highest thermal stability was obtained in the presence of TMEOS precursor and TiO2 NPs coated by P-based compound, which also provided the highest hydrophobicity. In conclusion, we presented an environmentally friendly and easily scalable process for the preparation of ceramer formulations capable of being formed into transparent, thermal-resistant, and hydrophobic fabric coatings, whose functions are extremely challenging for the textile market.

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Section: Ceramer Coatingmentioning

confidence: 63%

Insulating Thermal and Water-Resistant Hybrid Coating for Fabrics

Ortelli

Costa

2020

Coatings

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“…The thermal reliability is also a critical vector for PCMs with good thermal properties, which dominates the durability of energy storage systems . In view of this fact, the SA/Kaol and SA/Kaol‐0.5 are subjected to thermal cycle experiments of 10 and 50 heating‐cooling cycles, respectively.…”

Section: Resultsmentioning

confidence: 99%

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Yang

Zuo

et al. 2019

ChemistrySelect

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The effect of nitric acid on the thermal performance of stearic acid/kaolinite (SA/Kaol) composite phase change materials (PCMs) was studied. SA/Kaol was subjected to HNO3 manipulations at different acidity conditions. The results indicated that inferior thermal properties were detected at the acid‐treated composites with pH < 2. The latent heat value of SA/Kaol‐0.5 demonstrated an obvious reduction of about 30% compared with that of SA/Kaol, and its supercooling extent could reach as many as 11.2 °C while that of SA/Kaol was only 1.4 °C. Based on interfacial reaction analysis, the reduced crystallinity of SA should be attributed to the confinement effect originated from acid molecular clusters, while the supercooling behavior was caused by external ions. These ions could hinder SA molecules from adsorbing to the surface of crystal nucleus and thus delay the solidification process. As a result of segregation effect, the latent heat value of acid‐treated samples was deteriorated but the supercooling extent was relieved during thermal cycles. This work was the first that reported the effect of nitrogen oxides on PCMs. We believe that the results could play an enlightening role in the stability study of thermal property during PCMs practical applications.

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“…The arrows in Figure 2b show nanospheres assembled on silanized HNT particles which create rough surfaces, a characteristic critical to enhancing the hydrophobicity. [43] While grafting of Si-HNT particles on the cotton fabrics creates the desired surface roughness, the fabric still needs to undergo hydrophobic treatment. [37] The highly irregular shape of Si-HNT particles is helpful in creating surface roughness on the cotton fibers which increases the WCA.…”

Section: Introductionmentioning

confidence: 99%

Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

Patil

2019

Advanced Sustainable Systems

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This paper presents a sustainable biomimetic approach to create ultrahydrophobic cotton fabrics. Cotton fabrics are modified using biobased raw materials to create multiple scale roughness and low surface energy on their surfaces. Naturally occurring halloysite nanotubes (HNT) are modified by silanization and direct assembly of silica (SiO2) nanospheres on the surface of HNTs. HNTs “decorated” with SiO2 nanospheres are covalently bonded onto the surface of cotton fabrics, creating a durable multiple scale surface roughness. Surface modified cotton fabrics are further grafted with fatty acid without using any solvent, via esterification. The combination of the hierarchical roughness pattern created on the surface through modified HNT, and fatty acid treatment results in ultrahydrophobic fabrics with water contact angles (WCAs) above 150°. Surface topographies of modified HNT particles and chemical changes are fully characterized. Attenuated total reflectance Fourier‐transform infrared and WCA studies are used to confirm the grafting of modified HNT particles and aliphatic fatty chains on surface of fabrics. The ultrahydrophobic cotton fabrics washed for five standard laundry cycles (25 home washings) show that the ultrahydrophobicity is durable. Moreover, the ultrahydrophobic fabrics are oleophilic, making them suitable for use in oil–water separation, anti‐biofouling and packaging, and other applications apart from water repellent clothing.

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Flame retardant and hydrophobic coatings on cotton fabrics via sol-gel and self-assembly techniques

Cited by 147 publications

References 50 publications

Insulating Thermal and Water-Resistant Hybrid Coating for Fabrics

Insulating Thermal and Water-Resistant Hybrid Coating for Fabrics

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

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