Journal of Materials Chemistry B
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2021
·Vol. 9
·期 43
·9055-9066
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IF 6.331
Lili Hao,Peng Wang,Zhenxu Wu,Zongliang Wang,Yu Wang,Yongzhan Zhu,Zhiqiang Xu,Min Guo,Jiansong Ji,Peibiao Zhang
Single-modal magnetic resonance imaging (MRI) contrast agents sometimes cause signal confusion in clinical diagnosis. Utilizing ligands to endow iron oxide nanoparticles (IO NPs) with excellent dual-modal MRI contrast efficiency might be an effective strategy to improve diagnostic accuracy. This work presents the development of a special ligand-assisted one-pot approach for the preparation of super-hydrophilic magnetic NPs with excellent water dispersion, biocompatibility and T1–T2 dual-modal contrast enhancement properties. In addition, the strong binding capacity between the ethylenediamine tetramethylenephosphonic acid (EDTMP) ligand and water molecules induced by the presence of abundant hydrogen bonds significantly improves spin–lattice (T1) and spin–spin (T2) imaging of the IO core. After being modified with the EDTMP ligand, the T2 relaxation rate of the IO core is dramatically increased from 71.78 mM−1 s−1 to 452.38 mM−1 s−1, and a moderate T1 relaxation rate (11.61 mM−1 s−1) is observed simultaneously, implying that the NPs with an average size of 9.7 nm may be potential candidates as high-efficiency T1–T2 MRI contrast agents. This fundamental technique of using super-hydrophilicity ligands to endow IO NPs with dual-modal contrast properties without size change and damage in the T2 contrast effect may provide a useful strategy to facilitate the application of magnetic NPs in the field of medical diagnosis.
研究领域:
材料科学
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纳米技术
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医学成像
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Hui-Song Hu,Tian-Yu Zhao,Hao Li,Hai-Jing Sun,Lian-Kui Wu,Fa-He Cao
Zirconium-based conversion coatings (ZCC) have emerged as an environmentally sustainable alternative to traditional chromate conversion coatings (CCC) for aluminum alloy corrosion protection. However, their corrosion resistance remains inferior to CCC, limiting widespread adoption. In this study, we introduce a novel organic-reinforced ZCC incorporating ethylenediamine-tetramethyl phosphonic acid (EDTMP) on ADC12 aluminum alloy, significantly enhancing the corrosion resistance. Systematic electrochemical tests, copper sulfate test, and neutral salt spray (NSS) test demonstrated that the optimized coating with 1.0 g/L EDTMP exhibits outstanding performance, achieving a remarkably low corrosion current density ( i corr = 0.45 μA/cm²) and high total resistance ( R sum = 202,028.50 Ω·cm²). The ZCC-EDTMP-1.0 coating maintained a corrosion resistance efficiency ( η ) exceeding 91 % over 72 h of immersion in 3.5 wt. % NaCl solution, highlighting its long-term stability. NSS and copper sulfate tests further validate its robustness in harsh environments. This superior performance is attributed to EDTMP's ability to chelate metal ions, forming a densely interlocked and stable protective barrier. This work presents a promising strategy to enhance ZCC performance, offering a viable pathway for the industrial-scale adoption of eco-friendly, chromium-free conversion technologies.
研究领域:
材料科学
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腐蚀与防护
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Yuhua Dong,Yutong Xie,Jiaqi Yu,Wenjiao Zhang,Xueyan Du,Qiong Zhou
Scaling and corrosion are common issues in the petroleum industry that compromise production safety. Currently, organic coatings are considered the most effective method for scaling inhibition. This paper presents the synthesis of hollow periodic mesoporous organosilica (HPMO) nanocontainers with a high specific surface area and a uniform, ordered mesoporous structure, using a hard template method. The morphology of HPMO was controlled by adjusting the water-to-ethanol ratio and precursor amount. Characterization of HPMO morphology and structure was conducted using scanning electron microscope, transmission electron microscope, X-ray diffraction, and nitrogen adsorption-desorption analysis. To enhance loading capacity, HPMO was modified with 3-aminopropyl triethoxysilane, increasing the encapsulation of the scale inhibitor ethylenediamine tetramethylphosphonic acid (EDTMP) from 3.6 % to 13.8 %. The modified HPMO, loaded with the scale inhibitor, significantly improved the protective and anti-scaling properties of epoxy resin coatings. Compared with pure epoxy coatings, the scale inhibition rate of the composite coating increased by 42 % under static conditions and 90 % under dynamic conditions. The crystalline morphology of calcium carbonate scale was also influenced by the scale inhibitor; EDTMP promoted the formation of acicular aragonite and inhibited cuboid calcite growth in static conditions. In dynamic conditions, aragonite was not observed, and the calcite crystals were smaller than those formed in static solutions.
研究领域:
材料科学
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石油化工
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Haiyang Hu,Bingnan Song,Yang Lei
Phosphonates are widely used scale inhibitors, but the residual phosphonates in drainage are challenging to remove because of their chelating capacity and resistance to biodegradation. Here, we reported a highly efficient and robust Fe-electrocoagulation (Fe-EC) system for phosphonate removal. Surprisingly, we found for the first time that phosphonates like NTMP were more efficiently removed under anoxic conditions (80% of total soluble phosphorus (TSP) in 4 min) than oxic conditions (0% of TSP within 6 min) in NaCl solution. A similar phenomenon was observed when other phosphonates, such as EDTMP and DTPMP, were removed, highlighting the importance of iron complexation and floc formation toward phosphonate removal with Fe-EC. We also showed that the removal efficiency of NTMP by electrochemically in-situ formed flocs (97%) was much higher than post-adsorption systems (ex-situ, 40%), revealing that the growth of flocs consumed the active site for NTMP adsorption. Beyond the removal of TSP, 10 % of NTMP-P was also degraded after the electrolysis phase, evidenced by the evolution of phosphate-P. However, this did not happen in anoxic or chemical coagulation processes, which confirms the formation of reactive oxygen species via Fe(II) oxidation in the oxic Fe-EC system. The primary removal mechanism of phosphonates is due to their complexation with iron (hydr)oxide generated in the Fe-EC system by forming a Fe-O-P bond. Encouragingly, the Fe-EC system exhibits comparable or even better performance in treating phosphonate-laden wastewater (i.e., cooling water). Our preliminary cost calculation suggests the proposed system (€ 0.009/m 3 ) has a much lower OPEX under oxic conditions than existing approaches. This study sheds light on the removal mechanism of phosphonate and the treatment of phosphonate-laden wastewater by playing with the iron complexion and flocs formation in classical Fe-EC systems.
研究领域:
环境工程
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水处理
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化学工程
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Lei Chen,Huan Wang,Xiaohong Cao,Yue Feng,Zhibing Zhang,Youqun Wang,Yunhai Liu
A simple hydrothermal method was adopted to synthesize different inorganic-organic hybrid materials (Zr -x ), including zirconium ethylenediamine tetramethylene phosphine (Zr-EDTMP), 2-phosphobutane-1,2,4-zirconium tricarboxylate (Zr-PBTC), odium creatine phosphate zirconium phosphate (Zr-CP), and creatinol zirconium phosphate (Zr–COP). Various characterizations were utilized to explore the physical and chemical properties of materials. The applications of Zr -x in removing U(Ⅵ) were studied comprehensively. The effects of solution's pH value, contact time, initial concentration of U(Ⅵ), and temperature on adsorption were examined. Besides, the desorption, reusability, as well as adsorptive selectivity were investigated. The present study revealed that the U(Ⅵ) adsorption on Zr-EDTMP was in accordance with Sips isothermal model with the greatest adsorption capacity (317.4 mg/g) and the superior adsorptive selectivity for U(Ⅵ). Zr-EDTMP is a potentially high-efficient adsorbent for extracting U(Ⅵ) from radioactive wastewater .
研究领域:
环境科学
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材料科学
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核化学
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产品关联
DOI
高影响因子
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