Materials Today Chemistry
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2024
·
IF 6.7
Jing Zhou,Yong Guo,Zhongwei Chen,Tingting Chen,Yuan Yu,Qingwu Zhang,Juncheng Jiang
The construction of epoxy resin (EP) composites with remarkable flame retardancy, transparency, and mechanical properties was a challenging subject in the industry. A novel P/N/S oligomer flame retardant (PALO) was synthesized of terephthalaldehyde (TPAL), 4-aminothiophenol (PATP), and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO), and employed in EP to fabricate a series of EP/PALO composites with different PALO amount. Thermogravimetric analysis (TGA) revealed that PALO exhibited remarkable thermal stability, retaining a substantial char residue of 32.2 wt% at 800 °C. Thanks to the synergy of P, N, and S, EP/PALO composites exhibited excellent flame retardancy properties. The LOI value of the EP/PALO composites saw a rise from 31.0 % to 34.2 % as the PALO content increased from 2.5 to 10 wt%, while UL-94 remained at the V-0 rating. EP/PALO also showed significant heat suppression and smoke suppression effects. The combined effects of the physical barrier from phosphate-containing char in the condensed phase, along with the flame-retardant and dilution effects of phosphorus radicals, nitrogen, and sulfur inert gases in the gas phase, contributed to the significant enhancement in flame retardancy observed in the EP/PALO composites. A notable increase in the tensile strength , flexural strength , and elongation at break of EP was triggered by the incorporation of 2.5 wt% PALO, with enhancements observed by 18.2 %, 16.6 %, and 53.1 %, respectively. Simultaneously, PALO effectively maintained the favorable transparency of EP composites under different addition amounts. Therefore, this study outlined a holistic approach for the development of oligomer flame retardants containing P/N/S and had good application potential for constructing EP composites with superior flame retardancy, transparency, and mechanical properties under different addition amounts.
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Journal of Energy Storage
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2024
·
IF 8.9
Dengjie Luo,Wei Wang,Wuwei Feng,Shuo Liu,Bin He,Yuqin Liu
To meet the rising demand for energy storage, it is essential to achieve further improvements in the energy storage density and efficiency of composites based on dielectric polymers. Herein, Boron nitride nano sheets (BNNS) with high breakdown strength and high thermal conductivity was introduced into the matrix of polyvinylidene fluoride hexafluoropropylene (P (VDF-HFP)). Via synchronous heating and stirring treatment, BNNS were well dispersed in P(VDF-HFP) with increased fluidity due to the rise of temperature. With the incorporation of 7 wt% BNNS, the composite achieved high energy storage density of 21 J/cm 3 at 492 MV/m and high efficiency of 80.2 % concurrently, outperforms most previous polymer-based composite dielectric energy storage materials. This is attributed to the fact that BNNS can induce the formation of P(VDF-HFP) crystalline phase , and the simultaneous heating process improves filler dispersion to extend the breakdown path and disperse electron heat accumulation.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Dan Zhao,Deying Liang,Huan Liu,Xincai Xiao
Hypoxanthine (Hx) and pH are important indicators for evaluating the freshness of aquatic products, and their rapid assessment can maximize public food safety and minimize economic losses. A nanozymes-loaded smart responsive hydrogel compound provides a new strategy for rapidly assessing the freshness of aquatic products. Accordingly, this paper reports the preparation of a hydrogel compound with pH responsiveness and peroxidase (POD) activity using a one-step method. In this method, sodium alginate, chitosan, and gelatin are used as the raw materials and Fe,Co,P-CDs (CDs) with POD activity as well as 3,3′,5,5′-tetramethylbenzidine and H 2 O 2 are simultaneously introduced as substrates. The hydrogel compound transforms from a solid to a sol based on its pH response (pH = 6.5–8.0), and its color changes from blue to colorless because of its Hx response to the inhibition of the POD activity of CDs. The color difference shows a good linear relationship with the Hx concentration in the range of 1.5–1500 μM, with a detection limit of 1.48 μM and an excellent recovery rate of practical samples. Based on the pH enhancement and Hx accumulation during the spoilage of shrimps, naked-eye and smartphone-assisted, real-time monitoring of the freshness of shrimp has been realized through the morphology and color changes of the hydrogel compound. This dual-response hydrogel compound provides a new strategy for monitoring the freshness of aquatic products with great potential in food safety monitoring.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 34
·8788-8795
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IF 5.256
Xiaofang Qi,Jing Peng,Dongyan Tang,Ning Wang,Hongyun Zou
Molybdenum oxide nanomaterials have received increasing attention in recent years for their strong localized surface plasmon resonance (LSPR) absorption in the near-infrared (NIR) region and pH-dependent degradability. However, the rapid degradation of MoOx at physiological pH values would decrease the NIR photothermal effect. Here, we designed and prepared PEGMa–MoOx/p(NIPAM-co-MAA) microgels (NCs) exhibiting adjustable degradation. For that purpose, PEGMa (Mn = 400) modified MoOx was synthesized through a simple hydrothermal process. Then, PEGMa–MoOx with existing CC groups was continually polymerized with NIPAM and MAA through emulsion polymerization. MAA was introduced to provide an acidic microenvironment (pH at 3–5) to control the degradation rate of PEGMa–MoOx. The photothermal efficiency of the NCs could be maintained at 54% even after 14 days. Meanwhile, the NCs also displayed a pH-dependent thermal response. Moreover, PEGMa was added again in the emulsion polymerization process to elevate the photothermal efficiency, and the irradiation result indicated that the NCs could increase the temperature by 27 °C. The complex microgel integrates pH/temperature/photothermal triple response characteristics and exhibits huge potential for chemo-photothermal combination cancer therapy.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Hai-Yan Song,Tian-Fang Kang,Meng-Fan Jiang,Jing-Jing Zhang,Shui-Yuan Cheng
A novel, simple, and versatile electrochemiluminescence (ECL) sensing platform for Pb(II) ions was developed based on DNAzyme with peroxidase-like activity to catalyze the reduction of hydrogen peroxide. Poly (diallyldimethylammonium chloride) (PDDA) with positive charge was adsorbed onto the surface of graphene oxide (GO) and then CdS quantum dots (QDs) with negative charge were enriched to the surface of GO by electrostatic interaction between CdS QDs and PDDA to prepare a composite (denoted as [email protected] ) which was immobilized on the surface of a glassy carbon electrode (GCE). When hydrogen peroxide was used as coreactant CdS QDs can produce ECL signal. G-rich DNA strand, i . e . T30695, can combine with Pb (II) ions to form a stable parallel G-quadruplex. The G-quadruplex can further combine with hemin to form DNAzyme which have catalysis towards the reduction of hydrogen peroxide causing the decrease of ECL signal. Amino-modified T30695 was attached to [email protected] composite by the reaction between the amino group of T30695 and carboxyl group of CdS QDs. The ECL signal of the biosensor was linearly dependent on the logarithm of Pb(II) concentration from 1.0 × 10 − 14 to 1.0 × 10 − 11 M with a detection limit of 9 fM. An excellent performance of ECL biosensor indicated that it is promising for Pb(II) detection in real samples.
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Journal of Energy Storage
·
2025
·
IF 9.8
Huaiyu Wang,Yanjun Cai,Zhiran Zhang,Yu Liu,Rui Zhang,Ruiqiang Huo,Ruiyao Wu,Huiyun Cheng,Jiao Yin,Jian Yin,Zhi Su,Hui Zhu
Zinc-ion hybrid supercapacitors (ZHSCs) not only combines the advantages of batteries and supercapacitors, but also features low cost and environmental friendliness. However, the poor active site density and sluggish diffusion kinetics of carbon cathode brings about low capacity and terrible rate capability of ZHSCs. In this work, an activation assisted template procedure is proposed to synthesize nitrogen and phosphorous dual-doped hierarchical porous carbon (NP-HPC), where phytic acid acts as both doing precursor and activation medium. Benefitting from the synergetic modulation in porosities and surface functionalities, the optimized NP-HPC-2 delivers high capacity (394.51 F g −1 at 0.2 A g −1 ), superior rate capability (200.21 F g −1 at 50 A g −1 ) and excellent durability (95.7 % retention over 10,000 cycles). Consequently, the assembled ZHSC exhibits a remarkable energy density of 140 Wh kg −1 and an impressive power density of 40 kW kg −1 . Density functional theory (DFT) calculations revealed that the introduction of P doping adjust the distribution of local charge density of edged N with a lowered adsorption energy barrier for Zn 2+ storage. This work not only sheds light on the integrative effect of structure modulation and functionality regulation but also provide a feasible solution for the preparation of carbon cathodes towards high energy and power density ZHSCs.
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POLYMER
·
2024
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IF 4.1
Siqi Zhang,Shu Wu,Qi Wang,Mengxiang Guan,Bowen Yang,Guirong Peng,Xiaojia Zhao
P(VDF-HFP) is widely used in transistors, electret and artificial skin due to its excellent dielectric properties . In order to dramatically improve its dielectric constant, conductive fillers are used for doping, but the compatibility is not optimistic between the fillers and the PVDF . In this paper, PEDOT:PSS/P(VDF-HFP) all-organic films with interpenetrating network structure were prepared by the addition of H 2 O. The dielectric constant of the film with 0.5 wt % PEDOT:PSS reached up to 323 and the tanδ was only 0.48 (1 k Hz, 18 °C). The addition of the H 2 O made the small amount of PEDOT:PSS evenly distribute in the P(VDF-HFP), as a result, the percolation threshold decreased. Besides, molecular chains of PEDOT:PSS were overlapped to form a uniform network. This paper provided a novel preparation method for a uniform film with two kinds of matters with different compatibility.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xiandie Zhang,Zhijie Fan,Heng Xu,Haozhe Li,Chongqing Deng,Xueqin Yang,Xiang Zhou,Xiaode Guo
In this work, NH 4 CuF 3 is utilized as the metal fluorine source and P(VDF-HFP) as the organic fluorine source to fabricate the Al-NH 4 CuF 3 @P(VDF-HFP) ternary energetic thin film via electrospinning technology. The continuous encapsulation of the components Al and NH 4 CuF 3 by P(VDF-HFP) endows the Al-NH 4 CuF 3 @P(VDF-HFP) composite with excellent hydrophobic properties and acid-alkali corrosion resistance, providing Al and NH 4 CuF 3 with anti-aging performance and stability in extreme environments. Additionally, the reaction performance of the Al-NH 4 CuF 3 @P(VDF-HFP) ternary reaction system is analyzed. The results indicate that the Al-NH 4 CuF 3 @P(VDF-HFP) ternary reaction system combines the performance advantages of both the Al-NH 4 CuF 3 and Al-P(VDF-HFP) binary reaction systems, namely low-temperature reaction and a high reaction rate. It is confirmed that the application of the double-F strategy can obtain an Al-NH 4 CuF 3 @P(VDF-HFP) combustion system with a high reaction rate, high ignition sensitivity, and high combustion efficiency. The combustion mechanism of composites is revealed by the analysis of gaseous and condensed products and performance analysis of reaction process. The aim of this study is to integrate the advantages of metal fluorine and organic fluorine to enhance the reaction properties of Al-based energetic composites.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Yi Zhou,Wenfeng Zhao
Designing a low-cost and efficient photocatalytic system to produce high-valuable carbonates from the cycloaddition of CO 2 by using clean and renewable sunlight as the driving force shows great research potential. Here, a commercially available 4,4''-diamino-p-terphenyl (DT) was directly employed to promote the photocatalytic cycloaddition of CO 2 and various epoxides under visible light irradiation. As high as 95 % yield of target carbonate was obtained using blue LED (>450 nm) as a light source for 6 h under solvent-free/atmospheric CO 2 /room temperature conditions. Even under irradiation of natural light, a good yield of 68 % carbonate can also be achieved under ambient conditions. Moreover, in situ EPR and a series of controlled experiments were conducted to investigate the plausible photocatalytic mechanism, demonstrating that amino-containing DT with both π-π and p-π conjugated structure provides abundant basic sites and photogenerated electrons/holes as active sites for CO 2 activation and ring opening of epoxides at the same time.
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Desalination and Water Treatment
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2024
·
IF 1
Songhao Luo,Zhigang Yi,Min Cheng,Biao Song,Chengyun Zhou,Wenjun Wang,Zhifeng Liu
It is challenging to produce soft polymer materials with high surface area and nanoscale morphology that can be used for continuous flow water treatment in a processable, versatile, and stable manner. Here, we manufactured a processable Ag@CMPA-bph and used it to treat pollutants in wastewater at continuous flow conditions. The aerogel was prepared by a simple reduction method of CMP matrix and Ag metal precursors. Thermogravimetric analysis and electron microscopy showed that the aerogel had excellent thermal stability and distribution of fine Ag nanoparticles. The synthesized aerogel inherits the controllable properties of the CMP matrix and can be tailored to a specific shape for installation into the water treatment unit. In continuous flow conditions, this aerogel shows excellent catalytic activity to efficiently treat the combined pollutant containing p- nitrophenol and methyl orange ( p- NP&MO), which can reach a removal rate of more than 99 % at the flow rate of 0.6 L h -1 . Furthermore, the Ag@CMPA-bph can also be used for continuous flow treatment of pollutants in river water sample and shows robust anti-pollution load capacity and catalytic activity.
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International Journal of Electrochemical Science
·
2024
·
IF 1.3
Xing Liu,Ruiwei Wang,Cong Wang,Hongyu He,Jie Wei,Junli Yin
Laser-induced graphene (LIG) has garnered significant attention for its cost-effectiveness and high efficiency in fabricating flexible micro-energy storage devices. In this study, we devised a simple method to fabricate double layer P-doped LIG electrodes through repetitive laser induction technology for high-performance flexible energy storage applications. Instead of utilizing commercial polyimide (PI) thin film, we optimized the formation process of P-doped PI thin film and achieved a highly flexible double layer P-doped LIG thin film electrode with a uniformly porous structure and the high porosity through repeated laser induction processes. Experimental results demonstrated that the developed double layer P-doped LIG thin film electrode exhibits high porosity, high specific areal capacitance of 180 mF cm −2 , and high energy density of 0.025 mWh cm −2 . Furthermore, an all-solid-state micro-supercapacitor utilizing hydrogel electrolyte was assembled, demonstrating a high areal capacitance of 62 mF cm −2 and excellent cycling stability with 95% capacitance retention after 6000 charging/discharging cycles. Moreover, the developed all-solid-state micro-supercapacitor successfully powered a light-emitting diode, showcasing its significant potential for practical energy storage applications.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Shuang Yang,Meiyan Guo,Jiani Yang,Gang Xiong,Baoyi Ren,Fu Ding,Lixin You,Yaguang Sun
In this study, by hydrolysis of the phosphonate esters in these hypercrosslinked polymers (HCPs) made from two bis(α-hydroxyphosphonate) linkers (1, 4-bis[(diethoxyphosphoryl)hydroxymethyl]benzene, 1 ;4,4′-bis[(diethoxyphosphoryl)hydroxymethyl]biphenyl, 2 ) and polyaromatic compounds (9, 9′-spirobi[fluorene], SF; 1, 1′, 2, 2′-tetraphenylethene, TPE; tetraphenylmethane, TPM), respectively, two porous ( SF-1-H and SF-2-H ) and four non-porous ( TPE-1-H, TPE-2-H, TPM-1-H , and TPM-2-H ) hydrophilic HCPs were prepared and characterized in detail. In pure water systems, high adsorption capacities of creatinine and p -cresol on HCPs are exhibited, with saturated adsorption capacities ranging from 96 to 208 mg/g for creatinine and from 82 to 100 mg/g for p -cresol, respectively, with saturation adsorption being attained within 15 minutes. While in the simulated blood system, the porous polymers SF-1-H and SF-2-H show also significant adsorption capacities of creatinine (21 mg/g on SF-2-H ) and p-cresol (21 mg/g on SF-1-H and 24 mg/g on SF-2-H ). The kinetics, thermodynamics and adsorption mechanism of the adsorption process are investigated. This study not only investigated the different adsorption behaviour of creatinine and p -cresol on non-porous and porous materials under different solution conditions, but also provided a method for the preparation of adsorbents with fast and high adsorption capacity, offering new insights for future efficient perfusors.
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