JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Xingyu Liu,Yiping Tang,Jinwei Gao,Qi Luo,Zhi Zeng,Qianming Wang
A robust, one-pot synthesis of polymeric nanocluster in polar medium has been reported based on the assembly of polyethyleneimine (PEI) and p-phenylenediamine (PPDA). A number of process parameters including molecular weights of PEI, ratios between PEI and PPDA, reaction time, pH condition and solvent polarity have been discussed. This novel nanomaterial can exhibit striking blue-greenish emissions upon the excitation at 377 nm. More importantly, it is highly sensitive to the titration of copper ions and detection limit has been determined to be as low as 11.27 nmol. These results will pave the way for constructing next generation of polymeric devices.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Jie Zhang,Xiang Zhang,Yuying Zheng
Graphene (G) is an excellent protection material, but suffering corrosion-promotion effect because of its intrinsic high electrical-conductivity. Herein, a facile strategy is presented to effectively lower the conductivity of the G by the encapsulation of insulating poly(p-phenylenediamine) (PpPD). The obtained G@PpPD, which delivers an extremely low conductivity of 3.5×10 −7 S cm -1 , were then mixed with polyvinyl-butyral (PVB), forming a compact composite coating that can effectively protect Q235 steel from being corroded over a very long period. Such a superior anticorrosion property can be owing to the synergistic effect between impermeable graphene and insulated PpPD, which not only hinders the diffusion of the corrosive media, but also inhibits the corrosion-promotion activity of the graphene. This effective strategy may provide valuable enlightenment for the further development of graphene-based polymer anticorrosive coatings with long-lasting corrosion resistance .
研究领域:
材料科学
·
腐蚀与防护
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Zhicheng Tang,Tianwei Wang,Hua Lin,Shoulong Hao,Shufen Zhang,Rongwen Lu
Amination of 1-amino-4-bromoanthraquinone-2-sulfonic acid (BAA), crucial for anthraquinone-type dyes production, relies on Cu+ catalysis. However, Cu+ disproportionation causes catalyst deactivation, requiring large amounts of Cu catalysts (e.g., CuSO4 or CuCl) and reductants (e.g., FeSO4), introducing heavy metals and increasing water consumption to remove byproducts and metals, raising both environmental and economic costs. To address these challenges, we introduce a groundbreaking strategy for the in-situ generation of Cu+ using symmetrical Cu electrodes under alternating current (AC) electrolysis. This method achieves 100% conversion of BAA in the amination with 3,5-diamino-2,4,6-trimethylbenzene sulfonic acid (M Acid) with 95% yield, while also providing a solution to the issue of Cu+ disproportionation without the need for any additional copper catalysts or reductants, demonstrating a broad substrate scope and significantly reducing water usage in post-treatment. Characterization techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical impedance spectroscopy, reveal that the passive Cu2O film formed on the symmetrical Cu electrodes under AC electrolysis continuously generates Cu+, which is crucial for the reaction. This approach is scalable, environmentally friendly, and holds great potential for industrial applications, offering substantial economic benefits while reducing environmental impact.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 25
·期 2
·683-688
·
IF 2.646
Yu Qizhi,Kong Xiangfa,Chen Chaoshu,Kang Caiyan,Meng Mianwu,Huang Siyu
An Ag nanoparticles (NPs) layer was synthesized on Ag sheet by alloying/electrochemical dealloying method: X-ray diffraction confirmed that the new Ag phase appeared after removing Ga from Ag-Ga alloy, and scanning electron microscopy examination showed that the prepared Ag layer had a NPS structure. The fine microstructure of silver resulted in significant SERS enhancement effect, while the NPs layer was used as the SERS substrate: when the prepared NPs layer was used as a SERS substrate to detect p-phenylenediamine (PPD), it exhibited a strong SERS peak at 1590 cm −1 . The result revealed that the intensity of SERS peaks was linear to the logarithm of PPD concentration in the range from 10 −16 mol L −1 to 10 −12 mol L −1 and the detection limit was 1.0 × 10 −17 mol L −1 .
研究领域:
分析化学
·
纳米材料科学
·
光谱学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 3
·1122
·
IF 4.6
Juan He,Xiaomin Xu,Hainan Sun,Tengfei Miao,Meisheng Li,Shouyong Zhou,Wei Zhou
The harmful effects on the human body from p-phenylenediamine (PPD) in hair dyes can cause allergies and even cancer. Therefore, it is particularly important to accurately control and detect the content of PPD in our daily products and environment. Here, a small amount of non-metallic elemental P doped in perovskite oxide of SrCoO3−δ(SC) forms a good catalytic material, SrCo0.95P0.05O3−δ(SCP), for PPD detection. The improved performance compared with that of the parent SC can be attributed to three contributing factors, including a larger amount of highly oxidative oxygen species O22−/O−, better electrical conductivity, and more active sites on the P5+-oxygen bonds of SCP. Moreover, the lattice oxygen mechanism (LOM) with highly active species of lattice O vacancies and adsorbed –OO for electrocatalytic oxidation of PPD by the SCP/GCE (glass carbon electrode) sensor is proposed in our work. More importantly, the SCP/GCE sensor exhibits good stability, a low limit of detection, and high reliability (error < 5.78%) towards PPD determination in real samples of hair dyes, suggesting the substantial research potential for practical applications.Keywords:lattice oxygen;phosphorus-doped SrCo0.95P0.05O3−δ;p-phenylenediamine (PPD);electrochemical sensors;hair dyes
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2019
·
IF 2.87
Ye Wang,Yiwen Huang,Feiyu Wang,Jingjing Zhao,Yiming Zhang
The weak interactions between anions and common functional groups make it difficult for the development of anion photoluminescence sensors. In this work, we report an ultra-sensitive anion photoluminescence (PL) sensor for F − based on triethylene glycol monomethyl ether modified poly(p-phenylenediamine) dots (TPPDs). Due to the PET process in excited TPPDs, no obvious PL behavior can be observed in TPPDs. Due to the fast photoinduced electron transfer (PET) process in excited TPPDs, no obvious photoluminescence behavior can be observed: however, the PET process can be cut off in the presence of F − and TPPDs show bright red PL. The detection limit of this system is 2 × 10 −10 M, which is much lower than most other reported detection methods. Compared with traditional “ON-OFF” PL sensors, such an “OFF-ON” PL detection system shows higher value in practical applications. The detection system exhibits superior photostability and high selectivity for F − . We also demonstrate the successful F − detection in vitro based on TPPDs.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 6
·921
·
IF 2.467
Rui Zhong,Zhao Zhang,Hongguo Zhao,Xianru He,Xin Wang,Rui Zhang
Graphene oxide (GO), modified with anti-aging agentp-phenylenediamine (PPD), was added into nitrile rubber (NBR) in order to improve the thermo-oxidative stability of NBR. The modification of GO and the transformation of functional groups were characterized by Fourier transform infrared spectroscopy (FTIR), Raman, and X-ray diffraction (XRD). Mechanical performances of NBR composites before and after the thermo-oxidative aging were recorded. The results of dynamic mechanical analysis (DMA) show an increased storage modulus (G’) and a decreased value of area of tan δ peak after introducing modified GO into NBR. It indicates that filler particles show positive interaction with molecular chains. The thermo-oxidative stability of composites was investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). Then, the thermo-oxidative aging kinetic parameters were obtained by the Flynn–Wall–Ozawa (FWO) equation. The results of aging tests show that the thermo-oxidative stability of rubber matrix increases obviously after introducing GO–PPD. In addition, mechanical properties (tensile strength and elongation at break) of both before and after aged NBR/GO–PPD composites were superior to that of NBR. This work provides meaningful guidance for achieving multifunction thermo-oxidative aging resistance rubber composites.Keywords:graphene oxide (GO);p-phenylenediamine (PPD);nitrile rubber (NBR);thermo-oxidative stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Xinhua Cao,Na Zhao,Aiping Gao,Haiting Lv,Yuling Jia,Renmiao Wu,Yongquan Wu
Two new gelators containing bis-naphthalimides group were designed and synthesized. The gelator 1b could form gels in DMF and mixed solvent of DMSO/H 2 O (10/1, v/v). The self-assembly processes of 1b in two kinds of solvents were detailedly investigated by UV–vis, fluorescence, infrared spectroscopy, field emission scanning electron microscope (FE-SEM), X-ray diffraction and contact angle experiments. The experiment results showed the hydrogen bonding was the main force for the gel formation. The gel 1b formed in mixed solvent of DMSO/H 2 O (10/1, v/v) possessed of the ability of distinguishing of o -phenylenediamine, m -phenylenediamine and p -phenylenediamine. At the same time, the gelator 1b could selectively and sensitively detect p -phenylenediamine in solution with the detection limit of 8.961 × 10 − 8 M L − 1 . The detection experiment was also confirmed by DFT theoretical calculations. This research would expand the supramolecular self-assembly materials application in sensor field and offer a new detection method for organic amines.
研究领域:
超分子化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2021
·Vol. 98
·期 6
·673-682
·
IF 1.849
Changqing Miao,Yanbo Wang,Zhiying Ma,Yang Luo,Yu Miao,Pingfang Yuan,Jiao Guo,Gairong Chen,Hongbo Liu
In this study, poly( p- phenylenediamine) (PPDA) was synthesized by an enzymatic polymerization method using p- phenylenediamine as the monomer in the water phase. The PPDA structure was characterized by infrared (IR), gel permeation chromatography, and elemental analysis. The antioxidation behavior of the as-synthesized PPDA in biodegradable castor oil was investigated using a rotary oxygen bomb test and pressurized differential scanning calorimetry. A theoretical calculation was conducted to investigate its antioxidation mechanism. PPDA was found to exhibit excellent oxidation resistance in castor oil at 150 °C, which effectively prolonged the oxidation induction time of the oil. The results obtained herein suggest that as with phenolic antioxidants, PPDA with a hindered structure effectively improves the antioxidation performance of the oil by enhancing the stability of nitrogen free radicals.
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
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Hongcan Sun,Shuhong Xu,Zengwei Chen,Fan Liu,Shenfei Zong,Zhuyuan Wang,Chunlei Wang
Narrow band gap emissive carbon dots (CDs), especially those with full width at half maximum (FWHM) below 40 nm, is extremely important for biological imaging application due to higher color purity and better resolution. The synthesis of narrow FWHM emissive CDs usually requires the use of specific-structured molecular precursors with a large π conjugated domain. In comparison, the most common precursors for CDs, for instance p-phenylenediamine, are usually believed unsuitable for preparing CDs with FWHM emission below 40 nm. In this work, we challenged this stereotype by using p-phenylenediamine precursor to synthesize CDs with a small FWHM of only 29 nm. Instead of using traditional solvothermal method, a facile solvent-free method was developed to synthesize CDs with the powder of p-phenylenediamine in the autoclave under a reaction temperature of 200 °C. After dispersed in solution, CDs show a red emission around 615 nm with FWHM of 29 nm and a photoluminescence quantum yield (PLQY) of 12.8%. Through experiments and theoretical calculation, we found that the FWHM emission is positive correlated to the content of amino groups on the surface of CDs. In comparison to traditional solvothermal method, the current solvent-free method can promote the synthesis of CDs with less amino groups on the surface, reducing fluorescence center types, and hence realizing smaller FWHM emission. In addition, as-prepared CDs were used for biological imaging, and realized a rapid no-wash cell imaging.
研究领域:
材料科学
·
化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yujia Tong,Changing Miao,Wenlong Ding,Fiona Hammond Quarcoo,Xiao Xiao,Hongjun Ji,Weixing Li,Xiaohui Ju
The current methods of constructing modification strategies for hydrophilic membranes are time-consuming, complex in operation, and poor in universality, which limit their application on membranes. In this work, inspired by the adhesion properties and versatility of caffeic acid (CA) and p-phenylenediamine (PPDA), a simple, rapid, and universal method was designed for the separation of oil-in-water emulsion by preparing a stable hydrophilic coating separation membrane. The preparation time of the membrane was shortened to 40 min. The developed PVDF–PCA/PPDA membrane showed superhydrophilic and underwater superoleophobic properties. When applied to petroleum ether-in-water emulsion, isooctane-in-water emulsion, and dodecane-in-water emulsion separation, the oil rejection was more than 99.0%. In the circulating separation of 10 g/L soybean oil-in-water emulsion, the oil rejection was more than 99.3%, and the highest flux was 1036 L·m–2·h–1. The prepared PVDF–PCA/PPDA membrane performed well in the separation test of oily wastewater. The proposed strategy is simple and rapid; it may become a universal method for preparing membranes with super strong antifouling properties against viscous oil and accelerate the research progress of membrane separation of oil-in-water emulsions.
研究领域:
材料科学
·
环境工程
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Lin Liping,Xiao Yanling,Wang Yuhan,Zeng Yongnian,Lin Zujin,Chen Xi
Carbon dots doped with nitrogen and copper have been synthesized via a hydrothermal method. They possess favorable peroxidase-like catalytic activity over a wide range of pH values and temperatures. Specifically, they were used to catalyze the oxidation of ortho- and para-phenylenediamine (OPD and PPD) by H 2 O 2 . The resulting products possess different colors (yellow for OPD and brown for PPD), which can be visually discriminated. The corresponding typical absorption peaks of oxidized products for OPD and PPD are at 413 nm and 500 nm, respectively. The method displays excellent discrimination ability and selectivity over potential interferents. The detection limits are 1.1 μM for OPD and 1.9 μM for PPD. The respective linear ranges are from 5 to 200 μM for OPD and from 2.5 to 700 μM for PPD. The method was applied to the quantification of OPD and PPD in spiked natural waters.
Schematic presentation of the synthesis of nitrogen and copper co-doped carbon dots (N,Cu-CDs) and their application as an enzyme mimic for colorimetric discrimination of ortho-, meta- and para-phenylenediamine (OPD, MPD and PPD).
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）