CELLULOSE
·
2023
·Vol. 30
·期 7
·4713-4733
·
IF 5.7
Chen Maoshuang,Ayaz Pirah,Xiao Yuanxiang,Li Yong,Wang Pei,Huang Wenjia,Zhao Shujun,Fu Feiya,Liu Xiangdong,Xiang Shuangfei
Versatile cotton fabrics can be used in a variety of special environments and offer unparalleled advantages in textile products. In this work, bio-based phytic acid (PA), octadecylamine (ODA) and TiO 2 (NPs) were used as raw materials to prepare multifunctional cotton fabrics with excellent flame retardant (LOI = 48.5%), hydrophobic (WCA = 152°), UV-blocking (UPF = 2000) and antibacterial (BR = 100%) properties through a facile and scalable dip coating and spraying process. Firstly, the phytic acid was grafted onto the surface of cotton fabric by esterification reaction between its phosphoric acid group and the hydroxyl group of cellulose molecules. Then ODA reacted with the residual phosphoric acid group of phytic acid to form an ODA layer, for further immobilizing TiO 2 (NPs) particles on the surface of cotton fabric. The resulting cotton fabric possessed excellent flame resistance (LOI > 36.2%), hydrophobicity (WCA > 138°), UV-blocking (UPF = 2000) and antibacterial abilities (BR > 96.0%) even after 20 washing cycles. Moreover, this modification process did not sacrifice the desired cotton properties, including water vapor permeability, flexibility and tensile strength. This work proposed a simple and scalable pad-dry curing method to construct stable and multifunctional cotton textiles, which have broadened application prospects in many fields. Graphical abstract
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Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·943-949
·
IF 11.9
Yalei Wang,Jun Song,Wai-Yeung Wong
Polyaniline (PANI) hydrogels are promising cathode materials for aqueous zinc-ion batteries (AZIBs) due to their inherent porous structure and redox activity. However, the instability during the repeated charge/discharge process limits their application in commercial battery systems. Herein, PANI/MXene hydrogels are synthesized by grafting the negatively charged MXene with the aniline monomer followed by a rapid chemical oxidative polymerization reaction. After combining MXene nanosheets with the PANI chains, the hybrid hydrogels show a three-dimensional (3D) network structure of MXene nanosheets interconnected with PANI chains through hydrogen bond interactions, thus greatly improving the electrochemical reactivity and stability. Moreover, the 3D PANI/MXene network structure can provide fast transport channels for ions and electrons. Consequently, the PANI/MXene cathodes not only achieve a high capacity of 219.0 mA h g−1 at 0.2 A g−1, but also exhibit outstanding rate performance (147.5 mA h g−1 at 5 A g−1), together with excellent long-term cycling stability (over 5000 cycles with a capacity retention of 88.3%). The Zn2+ and CF3SO3− insertion/extraction mechanisms are further revealed by ex situ X-ray photoelectron spectroscopy (XPS) measurements. This work demonstrates the availability of conducting polymer hydrogels as cathode materials for high-performance AZIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jierui Ye,Yuebing Gao,Qingtian Xu,Zhenfu Jin,Guomin Wu,Siqun Wang,Zengkun Cai,Ke Yang,Qiang Wu,Qian Li
Cellulose nanofibrils (CNFs) have widely attracted significant attention due to the excellent mechanical performance, biodegradability, and high surface functionality. However, the high flammability of CNFs commonly restricts their wider application. In this study, the intrinsically flame-resistant holocellulose nanofibrils (HCNFs, which is rich in both cellulose and hemicellulose) were obtained from bamboo under pretreatment using a highly efficient ternary deep eutectic solvent (TDES) and subsequential mechanical homogenization. The phytates and sulfate-containing HCNFs (PHCNFs) displayed nanofibril diameter of 3–5 nm and high aspect ratio of (∼500), and the aqueous suspension exhibited colloidal stability and high transmittance. The PHCNF films exhibited excellent fire resistance, mechanical and optical properties. Compared with raw HCNF, the limiting oxygen index (LOI) of PHCNF-120 film was up to 52.5 %, and the total heat release (THR) and peak heat release rate (PHRR) of PHCNF-120 films were significantly reduced by 92.2 % and 82.4 %, respectively. The flame retardant mechanism was attributed to the synergistic effect of P/N/S in both condensed phase and gaseous phases during the burning process. This work provides a novel, efficient strategy for developing eco-friendly flame-resistant and fireproof holocellulose-based nanomaterials.
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International Journal of Chemical Reactor Engineering
·
2023
·
IF 1.6
Junxiang Guo,Jianlong Wu,Jirigele Qinggele,Zhixing Zhao,Tongbin Wang,Hongjun Yang,Daqiang Cang
The superoleophobic, superhydrophilic, and flame-retardant coatings were obtained through layer-by-layer (LBL) technology using fly ash (FA) as the core. Chitosan (CS), phytic acid (PA), and fluorosurfactant (FS50) were assembled onto FA by LBL assembly using the principle of electrostatic adsorption. The CS and PA were recycled assembled on FA core for 10 layers, which was further deposited with FS50 molecules as the final layer (marked as FA@CS-PA 10 @FS50). Multifunctional coatings consisted of the FA@CS-PA 10 @FS50 powders and polymer binders were formed and could be used on a variety of substrates of various shape and size. The obtained coatings presented superoleophobicity, superhydrophilicity, and flame retardance. The contact angles (CAs) of coated substrates were all greater than 150° towards various oils (rapeseed oil, diesel, hexadecane, and dodecane), while achieved water CAs as low as 0°. The as-fabricated coatings could efficiently separate different oil/water mixtures and lotions while avoiding pollution of the separated materials. The coatings also achieved superior flame retardance, and the fire was self-extinguished within 13 s. Moreover, it also obtained excellent mechanical durability.
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Materials
·
2023
·Vol. 16
·期 21
·7015
·
IF 3.4
Haipei Ge,Yu Liu,Fujuan Liu
In recent years, with the rapid development of the economy and great progress in science and technology, people have become increasingly concerned about their quality of life and physical health. In order to pursue a higher life, various functional and biomimetic textiles have emerged one after another and have been sought after by people. There are many animal and plant surfaces with special wettability in nature, and their unique “micro-nano structures” and low surface energy have attracted extensive attention from researchers. Researchers have prepared various textiles with superhydrophobic features by mimicking these unique structures. This review introduces the typical organisms with superhydrophobicity in nature, using lotus, water strider, and cicada as examples, and describes their morphological features and excellent superhydrophobicity. The theoretical model, commonly used raw materials, and modification technology of superhydrophobic surfaces are analyzed. In addition, the application areas and the current study status of superhydrophobic surfaces for textiles are also summarized. Finally, the development prospects for superhydrophobic textiles based on bionic technology are discussed.Keywords:superhydrophobic surface;biomimetic textiles;lotus leaf;theoretical modeling
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Materials Today Nano
·
2023
·
IF 10.3
Jingwen Wang,Hu Liu,Xiaoyan Yue,Dianbo Zhang,Rui Yin,Hongling Sun,Chuntai Liu,Changyu Shen
With the rapid development of wearable electronics, conductive yarn strain sensors have attracted much attention due to their excellent flexibility, conformability, and knittability. However, it is still a great challenge to prepare flexible conductive yarn strain sensors with high sensitivity and wide working range simultaneously. Here, a large-scale fabrication of conductive spandex yarn (SY) with synergistic conductive coating composed of lower stable carbon nanotubes (CNTs)-polyaniline (PANi) hybrid layer and upper ultrasensitive cracked PANi layer was successfully achieved via the simple solvent swelling , non-solvent-induced phase separation (NIPS), and in-situ reduction processes. Thanks to the synergistic effect of the double layered conductive coating and its tunable microstructure based on the PANi content, the assembled conductive SY strain sensor exhibits wide working range (0–321 %), high sensitivity (GF is 43, 950, and 2439 for strain range of 0–100 %, 170–270 %, and 280–321 %, respectively), ultralow detection limit (0.5 %), fast response/recovery time (140 ms/160 ms), and excellent fatigue resistance (4000 cycles). As a proof of concept, the strain sensor can be used for wearable applications to achieve the effective detection of full-range human motion and physiologic signals. Besides, it also displays great potential in human-computer interaction for reliable operation of remote-control manipulator and flexible electronic textile for spatial pressure distribution identification. Finally, owing to the excellent optical absorbing ability of PANi and CNTs, the conductive SY exhibits high-efficient and stable photothermal conversion capacity even under the stretching and bending states, endowing it with good wearing comfort. This study provides a convenient but effective strategy for the fabrication of high-performance wearable strain sensor with excellent thermal management capacity.
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POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Song Li,Feng Zhao,Xueya Wang,Zhihua Liu,Jingze Guo,Yutong Li,Shuangmei Tan,Zhenxiang Xin,Shuai Zhao,Lin Li
Green flame retardants have drawn much attention because of their environmental friendliness. But for the high flame retardancy of flammable polymers, most existing green flame retardants are unsatisfactory, even the flame-retardant process can not achieve high efficiency and environmental protection. In this work, flame retardants and flame-retardant process are addressed in a two-pronged approach. An eco-friendly bio-based synergistic flame retardant (PAU) was synthesized based on phytic acid (PA) and urea (U) through simple complexation assembly in water. The designed flame retardant coating can be directly coated on the surface of any topological shape with polydopamine as an adhesive. Flame retardant expandable polystyrene (EPS-PAU) with light weight and high toughness is prepared with the designed PAU flame-retardant coating. The coated EPS plates exhibit V-0 UL-94 rating and 42.0 % of limited oxygen index and excellent smoke suppression. Moreover, the density of EPS-PAU is slightly increased only by 2.27 % on the basis of the neat EPS, and the hard shell formed using PDA as an adhesive layer is beneficial for the improvement of impact strength. This novel biomass-based PAU system provides a promising strategy for manufacturing polymer products with excellent flame retardancy, smoke inhibition and light weight.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Meiqin Wu,Yunhui Chen,Hou-Yong Yu,Xiaosong Liu,Yanjuan Dong,Peng-Cheng Qian,Xiaohua Wang
Traditional halogenated flame retardants (FRs) have been severely hindered because they are toxic and hazardous carcinogenic byproducts during their application. In this study, we present a biobased FR composite consisting of cellulose nanocrystals (CNCs) modified with melamine (MEL) and phytic acid (PA) through successive grafting and electrostatic adsorption processes. It was found that the CNC/MEL/PA nanocomposite had a noticeable highly improved thermal blocking performance of the cellulose nanofibril aerogel, excellent carbon layer formation, and high thermal insulation ability because of a synergistic FR effect between the components in both the condensed and gas phases. These findings highlight the potential of nanoscale engineering in producing structural foams with excellent fire-retardant properties using cellulose and other nanosized fibrous biomaterials.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yueqin Li,Xiaohui Liu,Lin Han,Zichun Lu,Lingke Liu
Developing high mass loading of conducting polymers in hydrogels for flexible supercapacitors remains an enormous challenge. Herein, we demonstrate an effective and facile strategy for incorporating high mass-loading of polypyrrole (PPy) nanoparticles into an open porous polydopamine/polyacrylamide (PDA/PAAM) hydrogel substrate. The as-prepared PDA/PAAM/PPy hydrogels exhibit great stretchability and desirable self-healing properties. Taking advantage of the sandwiched configuration and high mass of electroactive PPy (up to 11.13 mg/cm 2 ), the PDA/PAAM/PPy hydrogels could be directly used as all-in-one supercapacitors, which can deliver a superior specific capacitance of 860 mF/cm 2 at 1.0 mA/cm 2 , an excellent energy density of 76.44 μWh/cm 2 , a maximum power density of 4 mW/cm 2 , and excellent capacitance retention of 85 % after 5000 cycles. What’s more, the PDA/PAAM/PPy hydrogels show significant strain-sensitive behavior. A self-powered sensing system integrating the supercapacitor and strain sensor is achieved to monitor various human motions. Therefore, the resultant hydrogels have potential applications in wearable electronics.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Ya Wang,Yuxiao Wang,Ting-Ting Li,Xiaomeng Wang,Hai-Tao Ren,Ching-Wen Lou,Jia-Horng Lin
Self-healing conductivity of materials is a very attractive property, but preparing a simple green conductive material is still a challenge. In this article, a self-healing conductive material was prepared by using polyaniline as a conductive substance with oxidized nanocellulose and polyacrylamide. When the oxidized nanocellulose and polyaniline are 1:1, the fracture stress of the material can reach 1.62 MPa (≈400%). Meanwhile, the material has a certain self-healing effect due to the presence of hydrogen bonding and electrostatic interaction forces. After 48 h of self-healing at room temperature, the maximum stress reached 0.83 MPa. The electrical conductivity can reach 47.22 μS/cm, and the self-healing efficiency of the material can reach >90% after 1 h at room temperature. This material is prepared by a solution casting process, which allows the material to be prepared in large areas.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
He Zhang,Yuping Du,Dengwei Jing,Liu Yang,Junyi Ji,Xiaoke Li
Solar-driven interfacial evaporation (SIE) technology has great advantages in seawater desalination. However, during the long-term operation of a solar evaporator, salts can be deposited on the solar absorbing surface, which, in turn, hinders the evaporation process. Therefore, there is an urgent need to propose new antisalt strategies to solve this problem. Here, we present a novel cogeneration system leveraging a salt-tolerant, heterogeneous Janus-structured evaporator (FHJE) for simultaneous solar desalination and thermoelectric generation. The top evaporation layer is composed of a graphene-based photothermal membrane pre-embedded with Fe3+ cations, which enhanced solar absorption and energy conversion abilities. Meanwhile, the Fe3+ cations further contribute to the Donnan effect, effectively repelling salt ions in saltwater. The bottom layer comprises a hydrogel composed of hydrophilic phytic acid (PA) and poly(vinyl alcohol) (PVA), fostering facilitation of water transport. The FHJE was demonstrated to exhibit evaporation rate and efficiency as high as 3.655 kg m–2 h–1 and 94.7% in 10 wt% saltwater, respectively, and superior salt resistance ability without salt accumulation after 8 h of continuous evaporation (15 wt%). Furthermore, a hydropower cogeneration evaporator device was constructed, and it possesses an open-circuit voltage (VOC) and a maximum output power density of up to 143 mV and 1.33 W m–2 under 1 sun, respectively. This study is expected to provide new ideas for comprehensive utilization of solar energy.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qian Ren,Xiaojing Zhang,Yangyi Sheng,Nuo Yu,Maoquan Li,Zhigang Chen
Mild-temperature photothermal therapy (mPTT) has shown some advantages over traditional photothermal therapy, such as reducing the damage to surrounding healthy tissues and minimizing side effects. Nevertheless, cancer cells can easily repair damage caused by mild hyperthermia due to heat shock proteins (HSPs). Thus, it is imperative to maximize the mPTT efficiency by down-regulating HSPs overexpression and combining other cancer treatments. Herein, we report the synthesis of phytic acid (PA)-Cu 2+ framework/copper sulfide (Cu 2-x S) nanocomposites (abbreviated as PA-Cu/Cu 2-x S NPs) as the novel therapeutic platform that can down-regulate HSPs overexpression for enhanced multimodal mPTT/chemodynamic therapy (CDT)/chemotherapy. PA-Cu/Cu 2-x S NPs were prepared through self-assembly and in-situ vulcanization strategy, resulting in irregular-shaped particles with an approximate size of 100 nm. PA-Cu/Cu 2-x S NPs display a plasmon effect from Cu 2-x S, which enhances near-infrared (NIR) absorption and possesses excellent photothermal conversion efficiency (41.7%). Moreover, PA-Cu/Cu 2-x S NPs exhibit Fenton-like reaction activity resulting from the Cu ions for CDT, and the reaction activity can be further improved 1.3 times due to mild hyperthermia during mPTT. Furthermore, the generated hydroxyl radical (•OH) can effectively decrease HSPs level to enhance mPTT. PA-Cu/Cu 2-x S NPs can also serve as a drug delivery system, and they are capable of loading doxorubicin (DOX) with a loading ability (20.7%). Combining mPTT/CDT/chemotherapy exhibits significant inhibition of tumor growth. This approach can serve as a basis for designing more exquisite platforms that combine mPTT with other therapies to achieve more effective cancer treatment.
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