Heterogeneously engineered porous media for directional and asymmetric liquid transport

Huang, Guanghan; Wei, Xianjun; Gu, Yuheng; Kang, Zhanxiao; Lao, Lihong; Li, Li; Fan, Jintu; Shou, Dahua

doi:10.1016/j.xcrp.2021.100710

Cited by 34 publications

(22 citation statements)

References 133 publications

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“…The T‐CF was composed of bamboo yarns (surface layer), bamboo/polyester yarns (middle layer), and polyester yarns (inner layer). In this case, the T‐CF showed a gradient of wettability through structural design and yarn properties, [ 32 ] which is similar to the structure of P. euphratica root (Figure 1a). We hypothesized that the T‐CF with this unique structure can lead to directional transmission of water from the inner layer to the outside layer of the fabric and remain the skin contact side of the fabric dry.…”

Section: Resultsmentioning

confidence: 71%

Three‐Layer Composite Fabric with the Gradient of Wettability Inspired by Populus euphratica Root Pressure for Drying and Cooling

Guo

et al. 2022

Adv Materials Inter

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Fabric with efficient sweat release and heat dissipation is highly desirable in a broad range of applications. However, creating such materials still remains a tough challenge. Here, inspired by the root pressure water of Populus euphratica and jade heat dissipation, a three‐layer composite fabric (T‐CF) for highly efficient personal drying and cooling is presented. The obtained T‐CF is formed by three individual layers with designed functions. The inner layer, middle layer, and surface layer are composed of cool polyester yarns, cool polyester/bamboo composite yarns, and bamboo yarns, respectively, to form a wetting gradient property. The biomimetic design offers the fabric with promising advantages, such as the unidirectional water conductivity of 800.34%, the water evaporation rate of 0.2611 g h−1, the instantaneous contact cool feeling of 0.186 ± 0.009 w cm−2, and the maximum cool temperature in wet state of 4.74 °C. Consequently, the T‐CF not only has good moisture absorption and moisture conduction, but also has heat dissipation and a certain sense of contact cooling. It is believed that the strategy reported in this work can provide a facile route for new‐generation functional fabric development regarding human health management.

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Section: Resultsmentioning

confidence: 71%

Three‐Layer Composite Fabric with the Gradient of Wettability Inspired by Populus euphratica Root Pressure for Drying and Cooling

Guo

et al. 2022

Adv Materials Inter

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“…In addition, the best-performing inexpensive fabric materials offer efficient oil/water separation, can feasibly be fabricated inexpensively on a large scale commercially and could be used as part of more complex multicomponent geotextile filtration systems in wastewater treatment or chemical processing. ,,, Sonochemical coating approaches can be applied at room temperature and pressure to synthesize various inorganic oxides with improved performance to construct micro/nano-structured functional surfaces that minimize pore cloggingas evidenced by the porous coated membranes produced here . Controlled surface modification of coatings was possible by controlling the aggregate size of precursor suspensions, allowing for a chemically guided topography that affected variations in structure and property of substrates, yielding ideal particle sizes for desired applications .…”

Section: Discussionmentioning

confidence: 99%

Sonochemical Routes to Superhydrophobic Soft Matter Coatings: Comparing Silica and Copper Oxide Coatings on Polyester Fabric

Ming

Chan

Mutalik

et al. 2022

Ind. Eng. Chem. Res.

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Reliable and long-lasting water repellency, ideally based on fluorine-free additives, is a desired utility in functional textiles, e.g., for outdoor active wear, workwear, and even protective medical garments. To date, such coating treatments have usually been accomplished by pad-dry-cure, electrolysis, or similar methods that tend to be time-consuming and often yield unsatisfactory coating results. In this study, hydrophobic-coated polyester substrates were prepared using a sonochemical coating process. Comparisons were made between the performances and associated morphological variations of amorphous nano-dimensional silica versus nanocrystalline cupric oxide hydrophobic coatings, which were separately made and successfully loaded, via a random distribution, onto mesoporous polyester-woven fabric substrates. Shorter sonication times seem to allow for retention of preformed morphologies into the subsequent coating patterns. The nanocomposite coatings and their components were characterized using X-ray diffraction (XRD), attenuated total reflectance-infrared Fourier transform infrared (ATR-FTIR), SEM, scanning electron microscope (SEM), UV–vis, dynamic light scattering (DLS), and Raman spectroscopy measurements. Almost all coatings displayed highly hydrophobic static water contact angle valuesfor CuO, these values further increased with time, a rarely reported aging effect thought due to the presence of mixed oxides that likely formed in the coating due to the spallative ultrasonic approach. In addition, the efficacy of these hydrophobic semipermeable fabrics to hexane–water mixture separations, with varying concentrations of Na2SO4, was found to be >99% for optimized membranes, with an associated permeation flux of ∼5.9 ± 2 L m–2 h–1, a water content of ∼0%, and a salt rejection capability of ∼94%. Thus, non-fluorine-containing sonochemical coating formulations and processes are ideal in the coating of soft matter, polymeric textiles.

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“…The design of directional water transport membranes is mainly based on two mechanisms, viz., the asymmetric wettability and pore‐size distribution across the membrane, inspired by nature's principles. [ 16 ] Typically, the “water diode” phenomenon has been demonstrated as an effective route to pump out sweat and release of skin moisture. [ 17 ] Janus‐wettable materials with asymmetric wettability on both sides have been widely studied to realize unidirectional water transport across the materials (usually films) without external energy input.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐Homogeneous and Hierarchical Electronic Textiles with Porosity‐Hydrophilicity Dual‐Gradient for Unidirectional Sweat Transport, Electrophysiological Monitoring, and Body‐Temperature Visualization

Dong

Peng

Wang

et al. 2023

Small

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On‐skin electronics based on impermeable elastomers and stacking structures often suffer from inferior sweat‐repelling capabilities and severe mechanical mismatch between sub‐layers employed, which significantly impedes their lengthy wearing comfort and functionality. Herein, inspired by the transpiration system of vascular plants and the water diode phenomenon, a hierarchical nonwoven electronic textile (E‐textile) with multi‐branching microfibers and robust interlayer adhesion is rationally developed. The layer‐by‐layer electro‐airflow spinning method and selective oxygen plasma treatment are utilized to yield a porosity‐hydrophilicity dual‐gradient. The resulting E‐textile shows unidirectional, nonreversible, and anti‐gravity water transporting performance even upon large‐scale stretching (250%), excellent mechanical matching between sub‐layers, as well as a reversible color‐switching ability to visualize body temperature. More importantly, the conducting and skin‐conformal E‐textile demonstrates accurate and stable detecting capability for biomechanical and bioelectrical signals when applied as an on‐skin bioelectrode, including different human activities, electrocardiography, electromyogram, and electrodermal activity signals. Further, the E‐textile can be efficiently implemented in human‐machine interfaces to build a gesture‐controlled dustbin and a smart acousto‐optic alarm. Hence, this hierarchically‐designed E‐textile with integrated functionalities offers a practical and innovative method for designing comfortable and daily applicable on‐skin electronics.

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Heterogeneously engineered porous media for directional and asymmetric liquid transport

Cited by 34 publications

References 133 publications

Three‐Layer Composite Fabric with the Gradient of Wettability Inspired by Populus euphratica Root Pressure for Drying and Cooling

Three‐Layer Composite Fabric with the Gradient of Wettability Inspired by Populus euphratica Root Pressure for Drying and Cooling

Sonochemical Routes to Superhydrophobic Soft Matter Coatings: Comparing Silica and Copper Oxide Coatings on Polyester Fabric

Quasi‐Homogeneous and Hierarchical Electronic Textiles with Porosity‐Hydrophilicity Dual‐Gradient for Unidirectional Sweat Transport, Electrophysiological Monitoring, and Body‐Temperature Visualization

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