THIN SOLID FILMS
·
2025
·
IF 2
Shanshan Duan,Hua Meng,Guanda Yang,Dirk W. Schubert
In this study, nickel-plated melamine sponge composites were prepared via a simple autocatalytic deposition for potential applications in flame resistance, electromagnetic absorption, and strain/pressure sensing. Commercial melamine foams were used as the base material, and nickel plating was achieved through a controllable process involving sensitizing, activating, and autocatalytic plating steps. The obtained Ni@Sponge composites were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermal gravimetric analysis (TGA) to collect the structure and thermal information. SEM images reveal uniform nickel distribution on the surface of the Ni@Sponge-High skeleton without significant structural deformation. Energy dispersive X-ray spectrometer (EDS) and FTIR analysis results confirm the nickel deposition, while TGA indicates enhanced thermal stability in the nickel-plated composite samples. Flame resistance tests demonstrate improved fire retardancy in the nickel-plated samples compared to that of the original sponge. Moreover, excellent electromagnetic absorption and strain/pressure sensing capabilities of Ni@Sponge-High based electronic sensors were observed, showcasing the potential applications of the composites in future human-machine interaction and artificial intelligence fields.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhibiao Guo,Mingkun Wang,Lei Qiao,Zhiwei He
Frequent oil spills and the discharge of oily wastewaters become a significant threat to the environment and ecosystem. Herein, a non-fluorinated lignin-based melamine sponge with superhydrophobic and photothermal properties (labeled as MS@COF/LPs/PDMS) has been achieved by decorating with covalent organic framework (COF), lignin particles (LPs) and PDMS. The MS@COF/LPs/PDMS shows excellent surface superhydrophobicity with a water contact angle of 152.3° and a sliding angle of 6°. The adsorption capacities of the MS@COF/LPs/PDMS range from 38.4 g/g to 100.3 g/g for various oils and organic solvents, and the separation efficiency of the MS@COF/LPs/PDMS for CCl 4 reaches 99.7 %. Furthermore, the maximum surface temperature of the MS@COF/LPs/PDMS reaches 61.2 °C because of the thermal vibration of LPs and COF under solar irradiation (1.0 kW/m2). Surprisingly, the MS@COF/LPs/PDMS can rapidly adsorb a droplet of crude oils within 32 s due to the superoleophilicity and excellent photothermal effect. Besides, the melting time of the MS@COF/LPs/PDMS (400 s) reduces by 70 % for an ice droplet under solar irradiation than that of pristine melamine sponge (1330 s). Thus, this study provides new insights into the rational design of low-cost lignin-based melamine sponges for the applications of oil/water separation, crude oil recovery, and de-icing.
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高影响因子
AIP Advances
·
2024
·Vol. 14
·期 3
·
IF 1.4
Cao Shenyang,Dong Tienan,Cao Yichen,Lei Jiabao,Zhang Siyi,Hang Zusheng,Huang Yu’an
The development and characterization of sulfonated melamine formaldehyde resin microspheres (SMF microspheres) as light diffusers in epoxy resin was presented in this paper. The SMF microspheres were prepared through dispersion polymerization with uniform particle size, smooth surface, and a high refractive index. The particle size of the microspheres was controllable within the range from 0.8 to 3.7 µ m according to the pH during acidic condensation and the amount of melamine. Compared to traditional MF microspheres, SMF microspheres possessed unique sulfonic acid groups, higher primary amine content, and stronger polarity, which prevent agglomeration when mixed with epoxy resin. The SMF microspheres thus prepared were used as light-diffusing fillers with epoxy resin as matrix. Experimental results and single-particle Mie scattering simulations confirmed that SMF microspheres with a higher refractive index and smaller particle size exhibited higher light-shading efficiency and the haze of EP, demonstrating their outstanding light-diffusing performance. In summary, the significant potential application of SMF microspheres in the field of light diffusers was demonstrated.
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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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JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 6
·1-14
·
IF 2.6
Sun Yumiao,Wang Ting,Zeng En
The uncertainty of the structure of melamine-formaldehye polymer is one of the important factors limiting its widespread application. The chemical reactions of melamine are almost always reversible, so controlling the microstructure is difficult. For the synthesis of polymer particles in water, it is unclear how the type of catalyst affects the microstructure of melamine-formaldehye polymers. Therefore, we conducted a detailed study to understand how different catalyst types( including 10% NaOH, trimethylamine, and a Na 2 CO 3 -NaHCO 3 buffersolution)affect the hydroxymethylation reaction, structure and the thermal properties of the melamine-formaldehye polymer). The results showed that with the same molar ratio and pH conditions, the use of triethylamine as catalyst in the melamine-formaldehye polymer increased the possibility of side reactions in the hydroxymethylation reaction. However, the occurrence of side reactions has a favorable effect on the thermal properties of melamine-formaldehyepolymers. Specifically, melamine formaldehyde polymers synthesized using triethylamine as a catalyst exhibit higher thermal decomposition characteristic temperatures, lower kinetic values, and higher reactivity. These results provide insights into the effect of catalyst type on the reaction mechanism, microstructure and thermal properties of melamine-formaldehye polymers, which may prove useful for their improved and controlled synthesis.
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Materials Today Energy
·
2024
·
IF 9
Fei-Feng Mao,Yu-Hua Dong,Yan Zhou,Ming-Shuai Sun,Wei Hui,Duan-jian Tao
Global climate change has driven the scientific community to improve the utilization of a critical C1 resource carbon dioxide (CO 2 ) through carbon capture utilization (CCU) technology. The cycloaddition of CO 2 with epoxides provides perfect atom economy and economic feasibility to produce versatile cyclic carbonates used in various industries. However, the stable nature of CO 2 and epoxides requires highly active catalysts. In this work, the repurpose of nitrogenous waste melamine foams (MF) as high-performance catalysts for the cycloaddition of CO 2 were explored. The pyrolyzed MF were modified with Cu to prepare a series of acid-base bifunctional porous catalysts (MFC-X-Cu). The results demonstrate that the acid-base synergy of the MFC-X-Cu catalysts increases the efficiency of the cycloaddition of various epoxides, yielding target products at 96-99% under mild conditions. Moreover, the characterization results revealed that the superior performance of MFC-X-Cu stems from its hollow structure and acid-base synergy, which are derived from nitrogen species in the repurposed MF and the post-modified copper component. The catalyst maintained consistent catalytic efficiency over five cycles, highlighting its strong recyclability. This work presents an eco-friendly and sustainable approach towards carbon neutrality by utilizing modified waste materials for CO 2 conversion into high-value chemicals.
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POWDER TECHNOLOGY
·
2025
·
IF 4.6
Shuqi Zhang,Jiangping Zhao,Yong Yang,YaChao Wang,Kainan Yu
To mitigate potential hazards of aluminum (Al) powder explosions, a green suppressant called MPP/ZB has been successfully produced using mechano-chemical technology. The suppressant consists of melamine polyphosphate (MPP) and zinc borate (ZB). This study examined the suppression effect of various mass concentrations of the composite suppressant on Al dust explosion. The results indicate that, with the addition of 100 wt% of MPP/ZB to the 300 g/m 3 aluminum powder, P max and K st decreased from 0.701 MPa and 8.7 MPa·m/s to 0.13 MPa and 0.2 MPa·m/s, respectively, effectively suppressing the explosions. Moreover, TG-DSC analysis of the suppressant and XPS/SEM examination of the explosion residues further revealed that the addition of ZB enhances the inhibitory effect of MPP on Al dust explosions. The H 2 O, Zn (OH) 2 and ZnO produced by ZB decomposition reduce the concentration of NH 3 generated by MPP decomposition, which may have a combustion promoting effect on Al dust.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Dengwang Lai,Mengyao Nan,Hao Wu,Li Liu,Yuhua Li,Yuejun Liu,Jun Yang
A green and bio-based flame retardant, MMT@PAMEL, was synthesized by coating phytic acid (PA) and melamine (MEL) self-assembled macromolecules onto the surface of montmorillonite (MMT) nanosheets. This novel flame retardant was employed to enhance the fire resistance of polyvinyl alcohol (PVA) films. To evaluate its fire performance, several standard tests were conducted, including the limiting oxygen index (LOI), vertical burning (UL 94), and cone calorimetry. The findings revealed a substantial enhancement in flame resistance. The LOI value of the PVA/MMT@PAMEL-15 composite film increased significantly from 19% (pure PVA) to 31%, achieving a UL 94 VTM-0 rating. Moreover, the peak heat release rate (PHRR) and total heat release (THR) of the PVA/MMT@PAMEL-5 composite film were reduced to 108.98 kW/m 2 and 2.71 MJ/m 2 , representing reductions of 57.11% and 33.42%, respectively, compared to the pure PVA film. The underlying flame-retardant mechanism was explored through thermogravimetric-infrared spectroscopy (TG-IR), scanning electron microscopy (SEM), Raman spectroscopy, and infrared spectroscopy. The results revealed that the primary mechanism involved PA decomposition during combustion, which released phosphorus-containing compounds that promoted the esterification of PVA, leading to the formation of char precursors. Additionally, the barrier effect of MMT contributed to the formation of a phosphorus-carbon composite, thereby reinforcing a continuous and compact carbon layer. Simultaneously, MEL released NH 3 and other non-combustible gases, which diluted the concentration of flammable gases and absorbed heat, forming a protective gas layer. These combined mechanisms significantly enhanced the fire resistance of the PVA composite films, providing a sustainable solution for improving fire safety in polymer materials.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhong-Min Xiao,Jia-Kang Liu,Guan-Feng Peng,Dong-Ping Li,Li-Ping Wang,Yong-Xiu Li
Oil spills and oily wastewater discharges not only cause serious environmental pollution but also result in great losses to water resources and harm to human health. Thus, there is an urgent need for an efficient and convenient oil–water separation method. In this work, the modified sponge (TFB-MDA@MS) was successfully obtained by grafting a covalent organic polymer (COPs) onto melamine sponge (MS). This composite sponge exhibited good hydrophobicity (the water contact angle in air was 147.7°) and excellent absorption capacity for different kinds of organic solvents (62.59–160.54 g/g), as well as excellent reusability. Furthermore, TFB-MDA@MS demonstrated a good separation effect on oil–water mixtures with a fast absorption speed. It maintained good hydrophobicity and absorption capacity in complex chemical environments (acids, alkalis and salts), and could achieve effective separation of water-in-oil and oil-in-water emulsions. This work presents a method for synthesizing COPs nanoparticle-modified hydrophobic sponges for oily wastewater treatment and the removal of organic pollutants from water surfaces.
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TALANTA
·
2025
·
IF 6.1
Hao Zhang,Wanyi Li,Ying Zhong,Meng Zhang,Kaile He,Yihan Yuan,Jinyi Wang
Surface-enhanced Raman scattering (SERS) based on noble metal nanoparticles has garnered significant attention in analytical chemistry due to its simplicity and rapidity for low-concentration detection. Although widely applied in fields like environmental monitoring, food safety, and biomedical diagnostics, the impact of silver nanoparticle shape on SERS performance remains insufficiently studied. Furthermore, traditional stationary solid and liquid SERS approaches are limited by inconsistent reproducibility and temporal variations in uniformity, respectively. To overcome these limitations, we introduce a simple continuous and online Ag SERS platform that employs spherical silver colloids within a capillary-Teflon tube system for dynamic, real-time analyte detection. Continuous fluid flow reduces variations in colloids, ensuring uniformity, while the enclosed system limits dynamic behaviors of colloids, enhancing stability. This platform demonstrates outstanding stability, with relative standard deviations of 2.30%. Its versatility is showcased through the quantitative detection of melamine in milk, 6-thioguanine in serum, and histamine in beer, demonstrating its capability for accurate, real-time detection in complex food matrices. This continuous and online Ag SERS platform represents a significant advancement in reliable, high-performance analyte detection, offering promising prospects for real-time analytical applications and providing a cost-effective, scalable solution for widespread use.
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Nanoscale
·
2025
·
IF 5.1
Ying Cao,Shihao Deng,Shuang Xia,Ju Bai,Yuan Shen,Ting Zhang,Tie Li
Humanoid robots, except the sensing requirement of force and temperature, will get high risk of prolonged exposure to complex light conditions, especially the UV radiation in automotive baking workshop, outer space, et. al, which will make the circuits and electronic components extremely prone to aging, needing timely assessment as well. Here, a multimodal flexible tactile sensor is assembled by utilizing a novel melamine sponge-MXene@CsPbBr3 hybrid aerogel as the sensing unit, which the melamine sponge provides the deformable support skeleton, the MXene realizes the functions of piezoresistive pressure sensing and thermoelectric temperature detecting, and the CsPbBr3 realizes not only the light sensing behavior, especially the visual capacity of ultraviolet excited photoluminescence, but also the synergetic enhancement of thermoelectric ability. Via these different kinds of sensing mechanisms, the derived flexible tactile sensor realizes the multimodal response to pressure, temperature and ultraviolet without cross-coupling. Furthermore, via using a machine learning algorithm, it can distinguish hardness and material of six automotive parts with high recognition accuracy of 98.2 % and 98.6 %, respectively. Moreover, based on the visual photoluminescence capability, a sensory array is assembled to successfully recognize different shapes. These provides a feasible way to protect the robots when using in complex operating environments.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Ya’nan Zhao,Long Yu,Jiarong Zhang,Tianran Zhao,Yi’na Yang,Chunna Yu,Chang Zhao,Guangjian Xing
The utilization of solar-driven seawater evaporation technology has proven effective for seawater desalination. This study focuses on developing Ta 4 C 3 T X /melamine sponges through a straightforward dipping-drying procedure. The porous melamine sponges, loaded with Ta 4 C 3 T X MXene within their framework, display remarkable elasticity, amphiphilicity, sunlight absorption capacity, and thermal stability due to the synergistic effects of the MXene and the sponge matrix. The Ta 4 C 3 T X /melamine sponges demonstrate superior photothermal conversion performance under sunlight irradiation. Under 1 sun, the sponges recorded an evaporation rate of 1.33 kg∙m −2 h −1 and a conversion efficiency of 83.79 %. Furthermore, outdoor assessments corroborated the sponges' impressive efficacy in seawater evaporation across diverse weather conditions. Significantly, these sponges exhibited self-desalination capabilities and long-term stability throughout the seawater evaporation process. Notably, the photothermal efficiency of the sponges is enhanced in proportion to the content of Ta 4 C 3 T X . Beyond seawater evaporation, these sponges have also demonstrated their effectiveness in applications such as deicing and photothermal therapy applications. Additionally, the sponges demonstrated a capacity to absorb oils and organic solvents, with an absorption capacity ranging between 19 and 55 g∙g −1 . Given their affordability, straightforward fabrication process, sustainability, and effective photothermal performance, the Ta 4 C 3 T X /melamine sponges present new opportunities for the development of multifunctional materials aimed at desalination and pollution remediation.
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