RSC Advances
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2016
·Vol. 6
·期 35
·29654-29662
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IF 3.289
Min Zhao,Linghui Meng,Lichun Ma,Guangshun Wu,Yuwei Wang,Fei Xie,Yudong Huang
Melamine used as a coupling agent was functionalized onto a carbon fiber (CF) surface in supercritical methanol to improve the interfacial properties of CF reinforced epoxy composites. Fourier transform infrared spectroscopy (FTIR), Raman spectra and X-ray photo electron spectroscopy (XPS) confirmed the successful grafting of melamine molecules onto the fiber surface. Scanning electron microscopy (SEM) images showed that melamine was grafted onto the CF surface uniformly and the surface roughness was enhanced obviously. Dynamic contact angle analysis (DCA) revealed the significant improvement in the surface energy and wettability. Compared with the untreated CF composites, the interfacial shear strength (IFSS) and inter-laminar shear strength (ILSS) of composites after melamine modification increased by 41.3% and 36.4%, respectively. The impact properties were also improved significantly. In addition, the reinforcing and toughening mechanisms were also discussed. Meanwhile, supercritical treatment did not decrease the single filament tensile strength obviously.
研究领域:
材料科学
·
复合材料工程
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FOOD CHEMISTRY
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2023
·
IF 8.8
Yichang He,Yiquan Liao,Bin Zhang,Ruiqi Xu,Ye Ma,Minggang Zhao,Hongzhi Cui
Melamine added to milk powder can lead to kidney injury and even death, but rapid detection is still hard due to the strong interference of milk powder solution. Herein, the CC/CeO 2 /CNPs mesh was constructed to detect melamine by using the photo-enhanced barrier effects on electrochemical response. Schottky barrier was regulated effectively to produce electrochemical response to melamine by photo-induced electrostatic interaction, which exhibited strong resistance to interference in milk powder solution. Sensitivity was enhanced by nearly 5 times and the lowest detection limit was reduced as low as 0.274 nM. The obtained high recovery (100%-104%) and good stability in milk powder solution indicated the good potential for practical applications. It provides a new opportunity for achieving strong resistance to interference by using the photo-enhanced barrier driving effect on electrochemical response.
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ACS Applied Nano Materials
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2023
·
IF 5.9
Fan Wu,Xiangxiao Meng,Zongxing Liu,Tiantian Lv,Long Yu,Jiarong Zhang,Ya’nan Zhao,Chang Zhao,Guangjian Xing
Flexible and long-term stable piezoresistive sensors still have room for improvement, in terms of sensitivity and cost reduction. Therefore, future research will focus on developing pressure-sensitive materials with improved performance and reduced cost. This study presents a stable suspension of Ta4C3 nanosheet using an etching and intercalation method. Subsequently, a Ta4C3 nanosheet/melamine sponge was created through a dipping-drying method and utilized as a flexible framework for wearable piezoresistive sensors. The sensors demonstrate exceptional pressure-sensing performance, including a high sensitivity (4.01 kPa–1) over a wide linear range of 0.018–12.06 kPa, a low hysteresis, a low detection limit (18.5 Pa), a short response time (35.4 ms), and a quick recovery time (27.88 ms), as well as long-term stability and durability. These sensors can be utilized for real-time monitoring of various physiological activities in the human body. Moreover, they hold potential applications in wirelessly detecting human movement and robot motion.
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Progress in Natural Science-Materials International
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2023
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IF 4.7
Jiahao He,Wenlu Zhang,Xinpeng Jin,Chong He,Wenbin Li
To achieve the scalable production of high-performance melamine-based flame retardant nanofibers , solution blowing spinning technology was employed into the continuous spinning of melamine(MA)@polyacrylonitrile(PAN) composite fibers. Propelled by the compressed air current, spinnable MA@PAN solutions can be shaped into nanofiber with a high flow rate over 50 mL/h. Among different melamine-based materials, melamine phosphate (MPP) exhibited excellent solubility in the solution, exceeding 30 wt%, ensuring that the MPP@PAN nanofiber products demonstrated exceptionally robust flame-retardant performance. Furthermore, through fiber textile needle punching technology, loose fiber sponge can be organized into enhanced fiber blankets. These MPP@PAN nanofiber products exhibited outstanding flame retardant and thermal insulation properties, rendering them pivotal as the flame-retardant materials in extreme environments.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2023
·
IF 5.2
Song Yan,Cao Chaochao,Shaobo Yang,Jiawei Ji,Zheng Zhou,Yaxin Gu,Chaoze Liu,Rongjuan Zhang,Yanming Xue,Chengchun Tang
Development of porous micro-nanomaterials with excellent physical and chemical stability as adsorbents for effective water cleanup still has huge practical implications. Here, hierarchically porous boron nitride nanosheets (BNNSs) with abundant active groups (-OH and –NH 2 ) and defective structures were prepared via the incorporation of phosphoric acid into melamine borate (M·2B) to form a melamine phosphate and borate assembly and subsequent pyrolysis . Phosphoric acid can interact with melamine through hydrogen bonding , which not only changes the micromorphology of porous BN materials but also regulates their chemical compositions and bonding states. The resulting porous BNNSs show a specific surface area as high as 1477.923 m 2 /g and a large pore volume . Encouraged by these characteristics, the resulting porous BNNSs exhibit remarkable adsorption capabilities for methylene blue (MB) in alkaline solution up to 750 mg/g and oxytetracycline (OTC) in acidic solution up to 128 mg/g. Additionally, they have excellent cyclic adsorption performance, suggesting a high practical value in wastewater purification. Therefore, this work not only presents the practical application of porous BNNSs in sewage treatment but also provides a designing scheme for preparing variety micro- and nano-BN materials by regulating and controlling the transformation of melamine salts.
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AICHE JOURNAL
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2023
·Vol. 69
·期 11
·e18192
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IF 3.7
Guanglu Xia,Jianhao Qiu,Dingliang Dai,Lu Zhang,Yong Tang,Jianfeng Yao
A series of covalent organic frameworks (COFs) with β-ketoenamine linkages named TpTt-COF, TAPT-COF, and TpPa-1 were constructed for photocatalytic H 2 O 2 generation in pure water and ambient air under visible light. Among them, TpTt-COF performed striking H 2 O 2 yield of 2647 μmol L −1 , which is 3.5, 17.5, and 176.5-fold those of TAPT-COF, TpPa-1, and bulk g-C 3 N 4 , respectively, attributing to the electron-deficient trait, short charge diffusion distance, and the narrowest bandgap of TpTt-COF. Additionally, to achieve the facile recovery, TpTt-COF was firmly and evenly anchored on melamine sponges (MS) because plenty of amino groups on the surface of MS could be involved in the β-ketoenamine formation and guide the synthesis of TpTt-COF on MS. The corresponding H 2 O 2 evolution over this photocatalyst monolith is also respectable and can be well repeated at least four times. This work is quite instructive for photocatalyst construction based on covalent organic frameworks and facile photocatalytic applications.
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MATERIALS CHEMISTRY AND PHYSICS
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2023
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IF 4.6
Xiaolu Zhang,Qianqian Zhang,Hui Su,Yafei Xu,Ling Li
A superhydrophobic and superoleophilic sponge (MS/UIO-66(F 4 )/RGO/PDMS) was fabricated by decorating the skeleton of a melamine sponge (MS) with UIO-66(F 4 ) nanoparticles and reduced graphene oxide (RGO) nanosheets layer by layer, and then hydrophobic modification with polydimethylsiloxane (PDMS). The composition, morphology, thermal stability, and wettability of the modified sponge were characterized, and its oil/water separation application was investigated. Characterization results reveal that compared with the hydrophilic pure MS, the fiber surface of the prepared sponge becomes rough and demonstrates remarkable super-hydrophobicity with a water contact angle of 153.5°. The modified sponge can efficiently separate water-in-diesel emulsion (flux of 3665 L · m −2 · h −1 ) and multiple stratified oil-water mixtures via the auxiliary device with a separation efficiency above 98.3%, which has no significant change after 25 cycles. The modified sponge can absorb oils or organic solvents 48–100 times higher than its weight, with a stable absorption capacity after 20 cycles. Moreover, it can be applied in handling flammable oils, showing good flame retardancy. Considering it also possesses excellent chemical stability, extreme environmental stability (resistance to high/low temperature, UV irradiation and load-bearing) and mechanical durability under harsh conditions, the modified sponge is a promising candidate in the field of oily wastewater treatment.
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JOURNAL OF FIRE SCIENCES
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2023
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IF 1.9
Chenran Fan,Lijuan Wei,Shicheng Zhao
To improve the flame retardant efficiency of intumescent flame retardants, some nano-scale additives as synergists were always added. In this work, nano silicon and piperazine pyrophosphate/melamine polyphosphate into polypropylene was investigated, which was obviously efficient to improve thermal stability and flame retardancy. The optimal synergistic ratio corresponded to 1 wt% SiO2, 10 wt% piperazine pyrophosphate, and 5 wt% melamine polyphosphate. The system passed the UL-94 V-1 classification and had a limiting oxygen index value of 34.5%. It exhibited a decrease on peak heat release rate and peak smoke production rate by 81% and 80%, respectively. Based on characterizations of scanning electron microscope, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the synergistic mechanism was investigated. A reactive cross-linking network between SiO2 and piperazine pyrophosphate/melamine polyphosphate during burning was formed to enhance the structure of carbon protective layer. Nano silicon acted as a foaming nucleating agent to promote the formation of porous dense carbon layer in intumescent flame retardants during burning. The synergistic strategy of SiO2 and piperazine pyrophosphate/melamine polyphosphate provided new compounded system for the design of polymeric materials with excellent flame retardancy, great thermal stability, and low release of heat and smoke.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Lingrui Zhang,Jinling Xie,Xuan Luo,Xiaobo Gong,Meng Zhu
Oil and organic solvent spills have caused serious environmental issues. To address these issues, several novel materials have been developed for the efficient separation of oil/organic solvents from water. In this study, ZIF-8 was loaded onto a melamine foam (MF) skeleton a simple in situ growth method. ZIF-8/MF was modified via a shell-ligand-exchange reaction (SLER) to improve its hydrophobicity. The prepared D-ZIF-8/MF exhibited strong hydrophobicity, with a WCA of 145.1° and an OCA of 0°. D-ZIF-8/MF can absorb up to 68–165 times its weight in oil/organic solvents. D-ZIF-8/MF also exhibited excellent stability, corrosion resistance, recovery, and recyclability. Furthermore, D-ZIF-8/MF has a high oil-water separation efficiency for absorbing organic solvents through a continuous oil-water separation device. This study provides a novel strategy for the preparation of strong hydrophobic foams via surface modification and SLER for oil-water separation. It has immense potential for the scale-up practical treatment of oily wastewater.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 21
·e53875
·
IF 3
Lei Li,Rui Chen,Fengyu Wen,Yashu He,Lin Cheng,Jierun Ma,Jianxin Mu
Oily wastewater has caused serious damage to the human health and ecological environment. It is urgent to develop novel materials for high performance oil/water separation. Porous melamine sponges (MS) are considered as an ideal matrix material for oil/water separation. Herein, molybdenum sulfide (MoS 2 ) modified with tannic acid (TA) and octadecylamine (ODA) was attached to MS framework via a facile dip-coating method. This novel and eco-friendly MS@(MoS 2 @ODA) sponge displays superior superhydrophobicity (WCA = 156.2°) and oil/water separation ability (absorption capacity = 113–145 g g −1 ). MoS 2 @ODA not only enhances surface roughness of MS framework, but also raises its specific surface area, causing an increase in the oil adsorption capacity of MS. Moreover, the composite sponge exhibited excellent chemical and mechanical stability. It is envisioned that this work can demonstrate a facile synthesis strategy for producing environmental friendliness MS with stable superhydrophobicity for high-efficient oil/water separation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jian-Nan Zhu,Xiao-Qin Zhu,Fang-Fang Cheng,Peng Li,Fei Wang,Ya-Wen Xiao,Wei-Wei Xiong
Heterogeneous catalysts prepared by doping metal ions in g-C 3 N 4 have been demonstrated as a type of promising alternative to the traditional homogeneous Fenton catalysts. The metal–N x active sites of metal doped g-C 3 N 4 composites are responsible for their enhanced catalytic activity. However, it is very difficult to achieve high content of metal–N x species through pyrolyzing the physical mixtures of metal salts and g-C 3 N 4 or melamine. In this work, copper doped g-C 3 N 4 composites were synthesized by pyrolyzing a melamine templated crystalline copper chloride [H 2 mela] 2 [CuCl 5 ]Cl. High content of Cu–N x species were formed in these Cu-g-C 3 N 4 composites. Compared with the catalysts prepared by pyrolyzing the physical mixtures of CuCl 2 and g-C 3 N 4 /mela, the Cu-g-C 3 N 4 composites exhibited enhanced catalytic activities for the degradation of RhB, MO, and MB. This work suggests that crystalline metal chlorides contained melamine ligands could be employed as efficient precursors for synthesizing metal doped g-C 3 N 4 composites with high content of metal-N x species.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 2
·1-9
·
IF 5.705
Chen Jun,Yu Chao,Gao Rufei,Geng Yanqing,Zhao Yilin,Niu Yazhen,Zhang Lei,Yu Yujie,He Junlin
A sandwich-type electrochemical DNA sensor is described for the detection of oligonucleotides typical for MECP2 gene mutations. Palladium nanoparticles (PdNPs) and platinum nanoparticles (PtNPs) were used to synthesize flower-like PdPt nanodendrites (NDs) by a one-pot method. The PdPt NDs possess a high specific surface area and excellent catalytic capabilities. They served as the carrier for the signal DNA probe (SP) and simultaneously catalyze the reduction of hydrogen peroxide (H 2 O 2 ). The PdPt NDs were modified with melamine, and this results in the formation of a PdPt-melamine network through stable interactions between the PdPt NDs and the three amino groups of each melamine molecule. The network exhibits excellent catalytic ability in enhancing the current signal response in the voltammetric detection of MECP2 gene mutation, best measured at −0.4 V vs. SCE and using H 2 O 2 as the electrochemical probe. In addition, gold nanoflowers were electrodeposited on the electrode interface in order to accelerate electron transfer and to capture the capture probe. The sensor is stable and can detect MECP2 gene mutations in the 1 fmol·L −1 to 1 nmol·L −1 concentration range, with a 0.33 fmol·L −1 lower detection limit at an S/N ratio of 3.
Schematic presentation of electrodes for the determination of the X-linked gene methyl-CpG-binding protein 2 (MECP2). The sensor is based on the electrooxidation of added H 2 O 2 by using the melamine modified palladium platinum bimetal nanodendrites as network signal amplification strategy. This versatile platform expands studies on the detection of monogenic disease.
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