COMPOSITES PART B-ENGINEERING
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2025
·
IF 14.2
Liting He,Lulu Song,Jing Fang,Hao Li,Ming Luo,Qixiu Cheng,Xiaoang Liu
The demand for advanced materials with low-frequency sound absorption, pressure resistance, and thermal insulation is increasing, particularly in aerospace, high-speed rail, and luxury automotive sectors. However, the functional limitations of current materials hinder their broader application in high-end industries. To solve this problem, this study combines a hierarchical porous biomass aerogel with a resonant cavity to create a Helmholtz resonance sound absorption structure. This design aims at achieving multiple functions, including low-frequency sound absorption, heat insulation, and pressure resistance capability. The sound absorption structure is composed of porous biomass aerogel instead of the traditional perforated plate and cavity. Among them, the hierarchical porous biomass aerogel is obtained from delignified kapok fiber and activated carbon crosslinked by gelatin. The influence of activated carbon concentration, resonant cavity depth and aerogel perforation rate on the low-frequency sound absorption effect in this aerogel is explored. The sound absorption structure demonstrates excellent low-frequency sound absorption performance. Additionally, the aerogel exhibits thin (the thickness of the aerogel material is 10 mm, the sound absorption structure is 30 mm), high compressive strength, and low thermal conductivity. This study provides a new idea for the preparation of multifunctional low-frequency sound absorption materials.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 17
·10733-10748
·
IF 5.7
Zhang Jing-Fang,Tang Ren-Cheng
Reducing the flammability of kapok fiber (KF) is an important strategy to increase its applicability. In this work, the phosphorylation of KF with ammonium dihydrogen phosphate (ADP) was used to reduce its flammability, the conditions of phosphorylation reaction were studied in detail, and the chemical groups, crystalline structure, thermal stability, heat release capability, flammability and charring ability of phosphorylated KF were analyzed. KF showed significantly higher phosphorylation level than cotton, and its phosphorylation greatly depended on ADP and urea dosage, reaction temperature and time, and pH. Urea addition, pH 6, 150 ℃ and 1 h rendered high phosphorylation with acceptable whiteness. Phosphorylated KF exhibited good char-forming, low heat release and excellent flame retardant performances during thermal degradation and combustion as evidenced by thermogravimetric, microcalorimetric, vertical combustion and combustion residue morphology analyses. The residue rate of phosphorylated KF subjected to thermal degradation exceeded 50% in nitrogen, and 25% in air. This investigation demonstrates that phosphorylated KF is an intrinsically flame retardant material. Graphic abstract
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9673-9679
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IF 10.733
Peng Mu,Wei Bai,Yukang Fan,Zheng Zhang,Hanxue Sun,Zhaoqi Zhu,Weidong Liang,An Li
Solar steam generation by heat localization has attracted much attention for its potential in the treatment of wastewater and seawater desalination. However, the preparation of a single-component solar receiver with low cost, simple preparation process, high mechanical strength and energy conversion efficiency is still a challenge. Herein, we report the preparation of kapok fiber-PPy aerogels with superwetting, porous structure, high light absorption, and high mechanical strength via polypyrrole modification of the Ca2+ crosslinked kapok fiber aerogels. The kapok fiber-PPy aerogels show three-dimensional structure with high porosity (94%), excellent light absorption (ca. 97%), low thermal conductivity (0.0241 W m−1 k−1) and high mechanical strength (0.12 MPa under 75% of strain). As a solar steam generation device, a high energy conversion efficiency of 82.4% was achieved under 1 kW m−2 illumination. The findings of this investigation may open a simple and novel route towards the fabrication of a low-cost a single-component biomass-based solar receivers for solar steam generation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xinyi Zhang,Haiting Shi,Liangsen Liu,Chunying Min,Shuaitong Liang,Zhiwei Xu,Yanling Xue,Chunxia Hong,Zhijiang Cai
Molybdenum disulfide (MoS 2 ) has possession of a layered structure and high theoretical capacity, which is a candidate anode material for sodium ion batteries . However, unmodified MoS 2 are inflicted with a poor cycling stability and an inferior rate capability upon charge/discharge processes. Considering that the shape and size of anode materials play a key role in the performance of anode materials, this paper proposes a multi-level composite structure formed by the micro-nano materials based on self-assembled molybdenum disulfide (MoS 2 ) nanoflowers , Mxene and hollow carbonized kapok fiber (CKF). The micro-nano materials can be connected to form heterojunction and agglomeration can be avoided. The load bearing of heterostructure and stress release of CKF are coordinated to form a double protection mechanism, which improves the conductivity and structural stability of hybrid materials . Based on the above advantages, it has higher specific capacity than pure MoS 2 , and has better rate performance (639.3, 409.5, 386.2, 372, 338, 422.8 and 434.7 mAh g −1 at the current density of 0.05, 0.1, 0.2, 0.5, 1 ,0.1 and 0.05 A·g −1 , respectively). The stress-modulated strategies can provide new insights for the design and construction of transition metal sulfides heterostructures to achieve high performance sodium ion batteries .
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Di Chen,Bin Wang,Xin-Li Xu,Man-Yu Zhang,Xin-Miao Bu,Sen Yang,Yanbo Luo,Xia Xu
In this study, a novel kapok fiber-supported liquid extraction (KF-SLE) method was developed for conveniently extracting analytes from oil samples. Natural kapok fiber without any pretreatment was directly used as an oil support medium. The extraction device was conveniently constructed by directly packing some kapok fibers into a syringe tube. Due to the fibrous property of the kapok fiber, no filter plate was needed. The cost of a KF-SLE device was as low as 0.5 CNY. The KF-SLE process was conveniently conducted using a simple three-step protocol: (1) the oil sample without any pretreatment including dilution was added directedly; (2) then, the oil-immiscible extractant was added; (3) after waiting a certain time for static extraction, the extractant was eluted out by pressing the kapok fibers with the syringe plunger. The extractant could be directly transferred for subsequent instrumental detection. For the feasibility and proof-of-concept study, the method was applied to quantify four synthetic flavor chemicals in edible oils. Satisfied quantification results were obtained with the correlation coefficient (R 2 ) being greater than 0.996, the relative recoveries ranging from 92.90% to 107.53% and intra- and inter-day RSDs being less than 7.56%. All in all, for the first time, the SLE technique was expanded to process oil samples and the method has the characteristics of low cost, environmental friendliness, high sample processing throughput and ease of automation, offering a promising approach for edible oil sample preparations.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Mengdi Xu,Hermela Ejegu Feysa,Xiaoqing Ni,Guangbiao Xu,Qingshuai Yan,Hua Shen,Run Wen,Fumei Wang,Yueqi Zhong,Xingjie Wang
To address the clinical challenges of conventional cotton gauze (CG), including inadequate hemostatic performance and strong blood clot adhesion, which impeded dressing removal, this study developed hydrophilic kapok fiber gauze (H-KG) and Janus kapok fiber gauze (J-KG) via hydroentanglement and chemical modification of natural kapok fibers. Results demonstrated that the kapok-based gauze significantly reduced blood loss and hemostatic time compared to CG, indicating superior hemostatic efficacy. Additionally, J-KG leveraged asymmetric wettability to prevent blood clot accumulation at the wound-dressing interface, enabling facile dressing removal. This work proposed, for the first time, the hemostatic mechanism of kapok fibers: axially aligned hollow cavities, thin-walled mesopores, and nanoscale grooves collectively generate multiscale capillary forces, forming a three-dimensionally interconnected fluid transport network, which spatially confined and enriched coagulation components through size-sieving effects, thereby accelerating the coagulation cascade. The study pioneered the high-value biomedical application of kapok fiber—a traditional economic crop—as advanced hemostatic gauze.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Lanfei Wei,Jiaquan Liu,Qiuman Zhou,Shaolong Liu,Zhifeng Su,Yurong Yan
Bismuth trioxide (Bi 2 O 3 ) acts as an ideal material for supercapacitors because of its high theoretical specific capacity, but its crystal form and compact accumulation limit its specific capacitance below its theoretical value of 1370 F g -1 . In this study, a specific kapok fiber@chitosan-derived carbon (KCC) doping inside β/α hybrid-crystal Bi 2 O 3 (KCC-Bi 2 O 3 ) was constructed by KCC assisting to enhance the contact area between Bi-MOF and air during calcination. A specific capacitance of 1135 F g -1 at 1 A g -1 was obtained for KCC-Bi 2 O 3 , which matched 82.3 % of its theoretical value. An asymmetric capacitor, with KCC-Bi 2 O 3 as a negative electrode and NiCo-LDH as a positive electrode, exhibits a potential window of 1.6 V and an energy density of 17.3 Wh kg -1 at 800 W kg -1 . The result demonstrates that incorporating a KCC carbon source can significantly enhance the capacitance of mixed crystal form Bi 2 O 3 , highlighting its potential in supercapacitor applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 14
·e55192
·
IF 2.7
Jing-Fang Zhang,Ren-Cheng Tang
Kapok fiber (KF) with a naturally hollow structure has found an increasing application in filling and composite materials, most of which have a demand of flame retardancy. To realize this high-value utilization, KF was phosphorylated by a reactive phosphorus- and nitrogen-containing flame retardant for enhanced fire safety. The flame retardant was first synthesized by the reaction of urea and diethylene triamine pentakis (methyl phosphonic acid) (a commercially available scale inhibitor) with low cost, and then, applied in the phosphorylation of KF in the presence of dicyandiamide. In thermogravimetric analysis, phosphorylated KF showed 38.1% residue weight in nitrogen and 10.2% residue weight in air at 700°C, whereas the residue weight of KF was 8.4% in nitrogen and 1.5% in air. In microcalorimetric analysis, the heat release capacity and total heat release of phosphorylated KF displayed a reduction of 81% and 55%, respectively. In vertical combustion test, phosphorylated KF was difficult to ignite and had no afterburning or smoldering. The tests indicated that phosphorylated KF had excellent charring properties, low heat release, and good flame retardancy. This work suggests a promising strategy of enhancing the flame retardancy of KF and increasing its applicability in filling and composite materials.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Bin Wang,Yongyue Chen,Wenxuan Li,Yuwei Liu,Xudong Xia,Xia Xu,Yongli Yang,Di Chen
Background Therapeutic drug monitoring (TDM) of antidepressants is essential for monitoring patient medication to avoid drug toxicity, complications, or nonadherence. Chromatographic techniques with high sensitivity and reproducibility are the main detection method for antidepressants. Effective pretreatment of biological sample processes is necessary prior to instrumental analysis. Magnetic solid-phase extraction (MSPE) has received much attention for its advantages of simple operation, rapidity, cost-effectiveness and low organic solvent consumption. Therefore, the development of a suitable and green magnetic sorbent for the detection of antidepressants in plasma and urine is apparently necessary. (88) Results A magnetic phytic acid-modified kapok fiber biochar sorbent (Fe 3 O 4 /PAKFBC) was successfully synthesized by pyrolytic impregnation and physical milling methods. Fe 3 O 4 /PAKFBC exhibited a large specific surface area (214 m 2 g −1 ) and a rich pore structure (5–10 nm). The extraction equilibrium, using 10 mg Fe 3 O 4 /PAKFBC, can be completed in about 1 min. The density functional theory (DFT) results showed that the adsorption mechanism of Fe 3 O 4 /PAKFBC on the six antidepressants mainly included electrostatic interactions, van der Waals interactions, π-π interactions and weak hydrogen bonding. Examination using the greenness assessment tools showed that the developed method exhibited excellent greenness. By combining with liquid chromatography-ultraviolet (LC-UV), a quantitative method with good linearity (R 2 > 0.993) and relative recoveries (92.4–107.7%) and negligible matrix effect (−11.5–6.0%) was developed. The Fe 3 O 4 /PAKFBC successfully detected six antidepressants in plasma and urine samples, requiring no pH adjustment with buffer salts. (142) Significance The environmental sustainability of the proposed methods was affirmed by six greenness evaluation tools, all indicating exceptional eco-friendliness. The Fe 3 O 4 /PAKFBC demonstrated outstanding greenness in both its creation and analytical application, proving highly effective in real sample applications and showcasing potential for broader use. This study contributes to a deeper and broader understanding of the microscopic adsorption mechanism, which can help in the optimization and development of more green sorbents. (69).
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高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Xiangyu Li,Qian Qin,Yanbo Luo,Yongqiang Pang,Jinchao Wei,Xingyi Jiang,Di Chen
Furfural compounds, including 5-hydroxymethylfurfural, furfural, and 5-methylfurfural, are common in foods and pose health risks. This study presents a pipette-tip solid-phase extraction with in-situ derivatization (PT-KF-SPE/ISD) method for rapid analysis of furfural compounds in various food matrices. Utilizing natural kapok fiber as an efficient adsorbent, this method integrates extraction and derivatization into a single step via a simple pull-push operation. Derivatization with 2,4-dinitrophenylhydrazine increases the hydrophobicity and ultraviolet absorption of furfural compounds, enabling sensitive liquid chromatography-ultraviolet detection. The method shows good linearity, sensitivity, and reproducibility, with limits of detection in ranges of 3.9–6.0 ng/mL. Real sample analysis confirms its applicability in detecting furfural compounds in beverages and herbal products, offering a reliable and eco-friendly solution for food safety and quality control. Five greenness assessment metrics demonstrate the method's excellent environmental friendliness. This approach highlights the advantages of combining natural adsorbents with in-situ derivatization for efficient food analysis.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Qiang Zhang,Bing Chen,Kun Wu,Bingfei Nan,Maoping Lu,Mangeng Lu
Phase change materials (PCMs) need to improve thermal conductivity and maintain stability to meet actual application requirements. Here, a novel composite based on hydroxylated boron nitride (BN-OH) as a thermally conductive filler with superior thermal energy storage and shape stability is reported. By combining kapok fiber (KF) and sodium alginate (SA), lightweight KF/SA aerogels were fabricated, and their highly porous but durable three-dimensional networks benefit the encapsulation of polyethylene glycol (PEG) and prevent the leakage of PEG. PCMs are prepared by vacuum-assisted impregnating of PEG into the aerogels. The thermal conductivity of 0.684 W∙m −1 ∙K −1 at 10 wt% BN-OH is greatly improved because hydroxyl groups cannot only reduce interfacial thermal resistance but form secure thermal conductive networks. In addition, this novel PCMs possesses excellent shape stability and high latent heat of fusion, and the PCMs keep their shapes stable without any leakage even is compressed upon the melting point of PEG.
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高影响因子
NANO
·
2024
·
IF 1
Aiqiong Wang,Jianxiong Li,Xiaoming Zhao
With the increasing quantity of intelligent and portable electric devices, a broad effective absorption bandwidth (EAB) microwave absorber (MWA) is required for shielding microwave (MW) interference. An MWA with a magnetic-dielectric synergistic effect is necessary for broadening the EAB of it. The amorphous/nanocrystalline Fe 85 SiAl 6 Cr 8 (FSAC) is a nanolevel high magnetic loss MWA, and the introduction of medium dielectric loss MWA nitrogen-doped carbonized kapok fiber (NCKF) with an appropriate proportion improved the impedance match and damping ability of the composite and broadened the EAB. The results revealed that the minimum reflection loss (RL min ) of FSAC/NCKF was −22.5 dB at 16.8 GHz with a thickness of 1.20 mm, and the EAB was 4.91 GHz with a thickness of 1.30 mm. Besides, the EAB moved to the low-frequency range when the thickness increased. Meanwhile, the RL of the simulation and the experiment were remarkably similar. The strategy offers an approach for developing a MWA with broad EAB.
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