INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2016
·Vol. 17
·期 4
·493
·
IF 3.257
Yongqiang Li,Jianwei Liu,Mei Lu,Zhiqing Ma,Chongling Cai,Yonghong Wang,Xing Zhang
Carboxylesterasesare an important class of detoxification enzymes involved in insecticide resistance in insects. A subgroup ofHelicoverpa armigeraesterases, known as Clade 001, was implicated in organophosphate and pyrethroid insecticide resistance due to their overabundance in resistant strains. In this work, a novel carboxylesterasegene001DofH. armigerafrom China was cloned, which has an open reading frame of 1665 nucleotides encoding 554 amino acid residues. We used a series of fusion proteins to successfully express carboxylesterase 001D inEscherichia coli. Three different fusion proteins were generated and tested. The enzyme kinetic assay towards 1-naphthyl acetate showed all three purified fusion proteins are active with aKcat between 0.35 and 2.29 s−1, and aKm between 7.61 and 19.72 μM. The HPLC assay showed all three purified fusion proteins had low but measurable hydrolase activity towardsβ-cypermethrin and fenvalerate insecticides (specific activities ranging from 0.13 to 0.67 μM·min−1·(μM−1·protein)). The enzyme was stable up to 40 °C and at pH 6.0–11.0. The results imply that carboxylesterase 001D is involved in detoxification, and this moderate insecticide hydrolysis may suggest that overexpression of the gene to enhance insecticide sequestration is necessary to allow carboxylesterases to confer resistance to these insecticides inH. armigera.Keywords:Helicoverpaarmigera;carboxylesterase;pyrethroid;heterologous expression
研究领域:
昆虫学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2016
·Vol. 23
·期 2
·1471-1480
·
IF 3.195
Xue Chao-Hua,Zhang Lin,Wei Pengbo,Jia Shun-Tian
A flame-retardant and superhydrophobic coating was applied to cotton textiles by a conventional pad-dry-cure method, which involved the deposition of branched poly(ethylenimine), polyacrylate soap-free latex and ammonium polyphosphate. The as-coated fabrics showed superhydrophobicity with a self-cleaning effect, and the fibers could generate a char layer in the flame-burning test, giving the fabrics a self-extinguishing property. Importantly, the resulting fabrics remained superhydrophobic after 75 commercial laundering cycles. The advantages of this method are being simple, affordable and easy to use in the factory production of large quantities of multifunctional textiles.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 22
·7002
·
IF 3.623
Jiayi Chen,Kuang Wang,Jialong Tian,Wenhui Yu,Yujie Chen,Na Li,Zhenming Qi,Chunxia Wang
In this work, a visible-light-driven BiOCl/Bi2WO6photocatalyst was obtained via a facile hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), ultraviolet/visible light diffuse reflection spectroscopy (UV/Vis), and photocurrent (PC). BiOCl/Bi2WO6was modified with (3-chloro-2-hydroxypropyl) trimethyl ammonium chloride to obtain the cationized BiOCl/Bi2WO6. Cotton fabric was pretreated with sodium hydroxide (NaOH) and sodium chloroacetate solution to obtain carboxymethylated cotton fabric, which was further reacted with cationized BiOCl/Bi2WO6to achieve finished cotton fabric. The cotton fabrics were characterized by Fourier-transform infrared spectroscopy (FT-IR), XRD, SEM, and EDS. The photocatalytic activity of the BiOCl/Bi2WO6photocatalyst and cotton fabrics was assessed by photocatalytic degradation of MB (methylene blue) solution under simulated visible light. The self-cleaning property of cotton fabrics was evaluated by removing MB solution and red-wine stains. Results revealed that the coated cotton fabrics exhibited appreciable photocatalytic and self-cleaning performance. In addition, anti-UV studies showed that the finished cotton fabrics had remarkable UV blocking properties in the UVA and UVB regions. Therefore, the finished cotton fabric with BiOCl/Bi2WO6can provide a framework for the development of multifunctional textiles.Keywords:BiOCl/Bi2WO6;cotton fabric;UV shielding;photocatalysis;self-cleaning
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Libo Zhang,Xiao Yang,Yequan Sheng,Qiguang Huang,Zhilin Yang,Yang Shi,Xuqiang Guo,Shengbo Ge
Conversion of agricultural and forestry waste biomass into high value-added bio-oil by mild hydrothermal method is of great significance to reduce the diesel consumption and alleviate the shortage of high-quality fuel oil supply. Most of the current research focuses on the parameter adjustment in the hydrothermal process, including temperature, time, catalyst and cosolvent, but the influence of the structure of raw materials on the hydrothermal conversion activity and the properties of hydrothermal oil is less. In this study, several typical pretreatment methods (including ball milling, alkali + ball milling, urea/NaOH and NaOH + ethanol) were used to change the structural characteristics of agricultural waste cotton stalks (CS), and the treated CS were used for hydrothermal conversion at low temperature (180–220 ℃). Taking the yield of hydrothermal bio-oil as index, the results show that various pretreatment can effectively improve the hydrothermal conversion activity of CS, improve the combustion performance of hydrothermal bio-oil and adjust the composition of hydrothermal oil. The hydrothermal bio-oil obtained by NaOH + EtOH pretreatment has the best properties, the yield is 7.41 % (wt, 220 ℃, 2 h), the calorific value is 24.16 MJ/kg, and the energy recovery is 10.98 %, which is higher than untreated CS bio-oil (with yield of 3.90 wt% at 220 ℃ and 2 h, calorific value is 23.32 MJ/kg and energy recovery of 10.98 %). The research will strengthen the role of lignocellulosic raw material structure in the hydrothermal process, which will play an important role in promoting the industrialization process of hydrothermal technology in the field of biomass, especially considering the optimization of operating parameters of various raw materials in the future industrialization.
研究领域:
能源生物学
·
生物质能工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Peng Wang,Yong Wang,Qingbo Xu,Qian Chen,YanYan Zhang,Zhenzhen Xu
Conductive cotton fabrics are widely used in electromagnetic shields and soft sensors because of their excellent softness and comfort. Generally, conductive cotton fabrics are prepared by depositing an inorganic conductive coating or an organic conductive polymer coating on them. However, due to the complex structure of cotton fabrics, these conductive coatings easily fall off and fracture under external forces, resulting in a sharp decline in the conductive properties of the finished fabrics. In the present work, L-cysteine was used as a binder to immobilize Ag NPs on cotton fabric. Ag NPs were covered by PEDOT:PSS to prevent them from falling off and cracking. As a result, the surface resistance of finished fabric was arrived at 8.7 Ω/sq. The finished fabric also exhibited excellent electromagnetic shielding effectiveness, with an electromagnetic shielding reached at 27.1 dB. Moreover, the composite coating significantly improved the durability of electrical conductivity and electromagnetic shielding properties of the finished fabric. In addition, mist polymerization was used to retain the inherent properties of the cotton fabric. We believe that the proposed method provides a new direction for the preparation of conductive cotton fabrics with a high stability.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Hui Li,Sainan Miao,Wei Chen,Xixue Yang,Minhua Li,Tieling Xing,Yan Zhao,Guoqiang Chen
Fluorinated polyhedral oligomeric silsesquioxane (F-POSS) has been widely used for preparing liquid-repellent coatings. It is usually pre-synthesized and dispersed in expensive fluoro-solvent (or fluorosurfactant solution) for dip coating. Since the melting temperature of F-POSS is not high (122–140 °C), its loss during use is inevitable. However, reports on the grafting of F-POSS on substrate are rare. In this work, we report the fabrication of superhydrophobic and oleophobic cotton fabrics through the silane coupling of (heptadecafluoro-1,1,2,2-tetradecyl) trimethoxysilane (FAS) and 3-mercaptopropyltriethoxysilane (MPTES) on cotton fiber and the subsequent UV-induced thiol-ene click reaction between octavinyloctasilasesquioxane (OVPOSS) and MPTES thiols (and 1H, 1H, 2H, 2H-perfluorododecyl-1-thiol, PFDT). The as-prepared FAS/SH-F-POSS cotton fabric showed superhydrophobicity and high oleophobicity, as well as good durability and self-healing ability. It can withstand at least 15 accelerated washing cycles, 2000 abrasion cycles over sandpaper, 10 cycles of O 2 plasma etching , acid/alkaline/salt solution corrosion, and 25 cycles of UV aging/moist erosion. Such a durable superhydrophobic and oleophobic cotton fabric is useful for functional clothing and textile products in various fields.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 17
·5849
·
IF 3.748
Qing Li,Run Lu,Yan Liang,Kang Gao,Huiyu Jiang
The traditional pre-treatment of cotton fabric hardly meets the requirement of low carbon emissions due to its large energy consumption and wastewater discharge. In this study, a low-temperature and near-neutral strategy was designed by establishing a tetraacetylethylenediamine (TAED)-activated sodium percarbonate (SPC) system. First, the effects of SPC concentration, temperature and duration on the whiteness index (WI) and capillary effect of cotton fabrics were investigated. Particularly, excess SPC’s ability to create an additional bleaching effect was studied. The optimized activated pre-treatment was compared with the traditional pre-treatment in terms of the bleaching effect and energy consumption. Further, the degradation of morin, which is one of the natural pigments in cotton, was carried out in a homogeneous TAED/SPC system to reveal the bleaching mechanism. Lastly, the application performance of the treated cotton was evaluated by characterizing the dyeability, mechanical properties, morphology, etc. The research results showed that temperature had a significant influence on both theWIand capillary effect, followed by the SPC concentration and duration. TheWIwas positively correlated with the SPC concentration, but excess SPC could not produce an obvious additional effect. TheWIof the fabric increased by 67.6% after the optimized activated bleaching using 10 mmol/L SPC and 15 mmol/L TAED at 70 °C for 30 min. Compared with the traditional process performed at 95 °C for 45 min, the activated process produced approximately 39.3% energy savings. Research on the bleaching mechanism indicated that the reactive species that participated in degrading the morin were the hydroxyl radical and superoxide radical, and the contribution degree of the former was larger than that of the latter. Two degradation components with molecular weights of 180 and 154 were detected using mass spectroscopy. Based on this, the bleaching mechanism of the TAED/SPC system was proposed. Moreover, the fabric after the activated pre-treatment had a suitable dyeability and strength, a lower wax residual and a smoother and cleaner fiber surface. The encouraging results showed that TAED/SPC is a promising bleaching system that is conducive to the sustainable advance of the textile industry.Keywords:pre-treatment;cotton;sodium percarbonate;bleaching mechanism;energy conservation
研究领域:
纺织工程
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Zhihua Liu,Shikai Song,Lingbo Dong,Jingze Guo,Jingchao Wang,Shuangmei Tan,Yutong Li,Mei Shen,Shuai Zhao,Lin Li,Zhenxiang Xin
In this work, LBL technology is applied to prepare a bio-based flame- retardant coating (U@PA-Na) by a sequential assembly of positively charged urea (U) and negatively charged sodium phytate (PA-Na) solution in water medium. The U@PA-Na system possess the characters of safety, non-toxic, and high efficiency in flame retardant. The flame retardancy of U@PA-Na is evaluated by the cotton coated with U@PA-Na coatings (COT/U@PA-Na) before and after washing treatment. The limiting oxygen index (LOI), vertical flame test (UL-94), and cone calorimeter test (CCT) composites are measured to evaluate the flame retardancy of COT/U@PA-Na. The LOI value of the COT/U@PA-Na3 composite after washing treatment can still reach 34.6% and pass UL-94 B1 grade, accompanied by damage length less than 150 mm and burning time less than 5s. It shows that U@PA-Na has excellent flame retardancy and water resistance. Cone calorimeter (CCT) measurements show that the peak heat release rate (PHRR) and total heat release (THR) of COT/U@PA-Na3 decreas by about 61% and 74% compared with untreated fabrics. The thermal decomposition time of the treated cotton fabric is significantly delayed, and the peak decomposition temperature (T 1max ) is reduced by about 62°C, while the average residue is improved to about 21% at 650 °C. The image of the cone calorimetric burnt carbon slag shows that the carbon layer of cotton fabric treated by U@PA-Na is very dense, indicating that the synergistic effect of PA and U can promote the formation of a high-quality carbon layer which plays a "barrier effect" to protect the substrate and delay the combustion process. The flammability and forced combustion tests show that the bio-based U@PA-Na flame-retardant system with good washing resistance can significantly improve the flame retardancy of cotton fabric, greatly reducing the fire risk.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Tao Wang,Lina Peng,Bowen Deng,Fang Yuan,Jia Guo,Qian Liu,Dongling Wu
Enzyme, as a type of biocatalyst, has a superior degradability on the biomass component. Herein, the cellulase degradation of cottonseed meal (CCM) is used as carbon source and potassium citrate as activating agent to fabricate O, S, N co-doped carbon materials. Cellulase pretreatment degrades the cellulose (from 12.48 wt% to 2.24 wt%) of cottonseed meal (CM) as well as creates the pore structure. Most importantly, the enzymolytic process can enhance the O content and improve the activation efficiency of potassium citrate. The optimized CCM-800-2 with hierarchical porous structure and high O (11.33 at%) content exhibits a high specific capacitance of 364 F g -1 in 6 M KOH electrolyte. In addition, the assembled potassium citrate-chitosan gel electrolyte-based symmetric supercapacitor with 20 mg cm -2 mass loading of active material shows a high energy density of 28.8 Wh kg -1 . This study provides an efficient enzyme assisted pretreatment and low activator ratio strategy to prepare biomass-based porous carbon, and expects to fabricate more carbon materials using other carbon precursors.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanotechnology
·
2023
·
IF 4.2
Caining Zhang,Xuman Wang
Superhydrophobic cotton fabric with photoinduced reversibly switchable wettability was prepared by a coating of the hydrophobic copolymer and α-Fe2O3 nanoparticles. The surface morphology of the fabric was observed by scanning electron microscope (SEM). The wettability of the surface was tested under UV illumination and after storage in the dark. The chemical composition of the cotton fabric surfaces before and after UV illumination was analyzed using an X-ray photoelectron spectroscope (XPS) and FTIR. The experimental results showed that the prepared cotton fabric exhibited the excellent superhydrophobic property with a contact angle (CA) of 157.3 ± 2.9°, and became superhydrophilic after UV illumination for 64 h. The surface wettability reverted back to its initial superhydrophobic state after being stored in the dark for 30 d. Based on the XPS and FTIR analyses, the possible mechanism was discussed, and the switchable wettability was caused by the content change of the hydroxyl groups on the α-Fe2O3 surface. Moreover, the superhydrophobic cotton fabric also became superhydrophilic after sunlight illumination for 120 h.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Jun Xiong Lin,Peng Wang,Xiang Wang,Chao Zhu
Sulfonated polyetheretherketone and polyvinylalcohol (SPEEK/PVA) blends under light illumination are capable of producing macromolecular radical anions which can be used for generating metal particles or degrading toxic chemicals. Therefore, modification of textile fabric with SPEEK/PVA blends will enable textile material to develop potentially useful applications. In this work, the cotton fabric was modified by SPEEK/PVA polymeric films via glutaraldehyde (GA) cross linker. The properties of the fabrics such as surface morphology, whiteness, wrinkle recovery, moisture permeability and stiffness were then investigated. It was found that the optimal ratio of PVA to SPEEK was 3 to 1, and the blend film was optically transparent and water-insoluble, which did not significantly alter the performance of cotton fabric.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Cheng Jiang,Qihua Wang,Tingmei Wang
Thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) was grafted onto the cotton fabric by atom transfer radical polymerization (ATRP). Introducing 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTS) onto the surface, the density of PNIPAAm chains can be adjusted because of the competitive reactions of (3-aminopropyl) triethoxysilane (APS) and PFDTS. With the appropriate ratio of APS and PFDTS, the cotton fabric can be switched from superhydrophilic to superhydrophobic by controlling temperature. The prepared cotton fabric may find application in functional textiles, soft and folding superhydrophobic materials.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）