Thermoregulating textiles and fibrous materials for passive radiative cooling functionality

Pakdel, Esfandiar; Wang, Xungai

doi:10.1016/j.matdes.2023.112006

Cited by 21 publications

(6 citation statements)

References 104 publications

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“…Under this condition, the formed Au NPs act as preferential reduction sites for Au 3+ ions . Larger Au NPs scatter the incident UV light more effectively, resulting in a slightly enhanced UV protection level. , …”

Section: Resultsmentioning

confidence: 99%

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO₂ Colloids on Cotton Fabric

Pakdel,

Daoud,

Wang

2024

ACS Appl. Mater. Interfaces

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This study aims at understanding the effect of the photoreduction process during the synthesis of gold (Au)-doped TiO 2 colloids on the conferred functionalities on cotton fabrics. TiO 2 /Au and TiO 2 /Au/SiO 2 colloids were synthesized through the sol−gel method with and without undergoing the photoreduction step based on different molar ratios of Au:Ti (0.001 and 0.01) and TiO 2 /SiO 2 (1:1 and 1:2.3). The colloids were applied to cotton fabrics, and the obtained photocatalytic self-cleaning, wet photocatalytic activity, UV protection, and antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria were investigated. The obtained results demonstrated that the photoreduction of Au weakened the self-cleaning effect and reduced the photocatalytic activity of coated fabrics. Also, an excess amount of Au deteriorated the photocatalytic activity under both UV and visible light. The most efficient self-cleaning effect was obtained on fabrics coated with a ternary TiO 2 /Au/SiO 2 colloid containing ionic Au, where it decomposed coffee and red-wine stains after 3 h of illumination. Adding silica (SiO 2 ) made the fabrics superhydrophilic and led to greater methylene blue (MB) dye adsorption, a faster dye degradation pace, and more efficient stain removal. Moreover, the photoreduction process affected the size of Au nanoparticles (NPs), weakened the antibacterial activity of fabrics against both types of tested bacteria, and modestly increased the UV protection. In general, the photoactivity of Au-doped colloids was influenced by the synthesis method, the ionic and metallic states of the Au dopant, the concentration of the Au dopant, and the presence and concentration of silica.

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Section: Resultsmentioning

confidence: 99%

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO₂ Colloids on Cotton Fabric

Pakdel,

Daoud,

Wang

2024

ACS Appl. Mater. Interfaces

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“…The existing silver nanoparticles on cotton fibers induced a photothermal effect on fabrics after exposure to NIR light (Figure ). The photothermal functionality has been utilized in different practical applications such as developing thermoregulating fabrics, , artificial muscles, oil–water separation, , developing antibacterial surfaces, and de-icing surfaces, − to name a few. Figure a shows that raw cotton fabric and the samples coated with pure PDMS did not have a noticeable temperature change after exposure to NIR radiation.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Superhydrophobic Cotton Fabric with Photothermal, Self-Cleaning, and Ultraviolet Protection Functionalities

Pakdel

Sharp

Kashi

et al. 2023

ACS Appl. Mater. Interfaces

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Cotton fabrics with superhydrophobic, antibacterial, UV protection, and photothermal properties were developed using Ag/PDMS coatings, and the role of coating formulations on the obtained functionalities was studied. Specific attention was paid to understanding the relationships between the fabrics’ superhydrophobicity and antibacterial activity against Escherichia coli (E. coli) bacteria. UV protection performance of Ag/PDMS coatings was thoroughly evaluated based on the variation of UV transmission rate through coated fabrics and photoinduced chemiluminescence spectra. Moreover, the effect of silver nanoparticles (Ag NPs) and PDMS on developing a photothermal effect on fabrics was discussed. It was found that the content of Ag NPs and PDMS played critical roles in determining the water contact angle (WCA) on modified fabrics. The largest WCA was 171.31°, which was durable even after numerous accelerated wash cycles and abrasions. Antibacterial activity of fabrics showed the positive effect of pure PDMS in bacterial growth inhibition. Moreover, it was found that the antibacterial performance was greatly affected by the content of Ag NPs loaded on fabrics rather than their superhydrophobic status. Moreover, increasing the content of Ag NPs boosted the UV protection level of fabrics, improved fabrics photostability, and reduced the UV transmission rate through fabrics. Testing the photothermal effect confirmed that the content of Ag NPs and PDMS both played prominent roles, where Ag acted as a photothermal agent and PDMS determined the NIR reflection rate from the coated surface. The modified fabrics were characterized using TGA, SEM, FTIR, and XRD techniques, and it was confirmed that using a higher amount of PDMS increased the amount of Ag NPs deposition on fabrics.

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“…Taking human radiative cooling materials as an example, it merely controls the temperature of the human body itself, showing more efficient energy saving. 27–35 However, human radiative cooling materials often suffer from complicated fabrication processes ( e.g. , phase inversion 36 and electrospinning 37,38 ), harmful solvents, 39 poor compatibility 40 and so on.…”

Section: Introductionmentioning

confidence: 99%

Polyethylene fibers containing directional microchannels for passive radiative cooling

Sun,

Peng,

et al. 2024

Mater. Horiz.

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Thermoregulating textiles and fibrous materials for passive radiative cooling functionality

Cited by 21 publications

References 104 publications

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO₂ Colloids on Cotton Fabric

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO₂ Colloids on Cotton Fabric

Antibacterial Superhydrophobic Cotton Fabric with Photothermal, Self-Cleaning, and Ultraviolet Protection Functionalities

Polyethylene fibers containing directional microchannels for passive radiative cooling

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Thermoregulating textiles and fibrous materials for passive radiative cooling functionality

Cited by 21 publications

References 104 publications

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO2 Colloids on Cotton Fabric

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO2 Colloids on Cotton Fabric

Antibacterial Superhydrophobic Cotton Fabric with Photothermal, Self-Cleaning, and Ultraviolet Protection Functionalities

Polyethylene fibers containing directional microchannels for passive radiative cooling

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Product

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Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO₂ Colloids on Cotton Fabric

Effect of the Photoreduction Process on the Self-Cleaning and Antibacterial Activity of Au-Doped TiO₂ Colloids on Cotton Fabric