JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Zhi-Juan Zhang,Peng-Wei Li,Lu-Ping Liu,Li-Hua Ru,Han-Xiao Tang,Wei-Sheng Feng
The analysis of breath VOC biomarkers is an efficient method for the early diagnosis of lung cancer. In this work, the zirconium UiO-66 was post-synthetically modified by using methylamine (MA), ethylenediamine (ED) and N,N′ -dimethylethylenediamine (MMEN), respectively. The modified UiO-66 materials were thoroughly characterized, including PXRD , FTIR, TGA , physical adsorption at 77 K by nitrogen and photoluminescence analysis. The sensing properties of the modified UiO-66 materials toward the selected five potential breath VOC biomarkers were investigated. Results showed that after modification, the BET surface area and total pore volume all decreased, and followed the order: UiO-66 > UiO-66-MA > UiO-66-MMEN > UiO-66-ED. Furthermore, the N–H group was successfully grafted into the modified UiO-66 samples. In comparison with UiO-66, the fluorescence intensities of UiO-66-MA, UiO-66-ED and UiO-66-MMEN toward hexanal , styrene and isoprene all obviously increased, while the fluorescence intensities of the modified UiO-66 materials toward 1-propanol and ethylbenzene all decreased a lot, accompanied by the frequency shift. In addition, the LOD of hexanal on UiO-66-MA was calculated to be as low as 12 ppm, which was obviously lower than that of UiO-66 (31 ppm). The fluorescence quenching of hexanal was mainly due to the FRET mechanism. The results of this study would provide information for the development of early breath diagnosis of lung cancer.
研究领域:
医学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2021
·Vol. 54
·期 2
·156-164
·
IF 1.607
Li Jian
The TiO 2 is grafted by triethylamine and is introduced on the surface of the carbon fiber, which improves the wettability and activity of the carbon fiber surface and at the same time strengthens the carbon fiber/polyimide composite. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the triethylamine grafting successfully on TiO 2 . Scanning electron microscope (SEM) results show that when the trimethylamine concentration is 1.0%, a uniform coating is formed on the surface of the carbon fiber. The interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) were increased by 32% and 69%, respectively.
研究领域:
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 17
·7920-7932
·
IF 8.867
Lina Xu,Jia Xu,Baotian Shan,Xiulin Wang,Congjie Gao
Novel thin-film composite (TFC) membranes were elaborately designed and fabricated via the incorporation of mussel-inspired dopamine (DA) into an m-phenylendiamine (MPD) aqueous solution followed by interfacial polymerization with trimesoyl chloride (TMC) on a macroporous substrate. This DA-incorporation strategy was distinct from the previous DA layer serving as a hydrophilicity–promoter or reactive intermedia. The elastic structure of the polyamide (PA) layer and the hydrophilicity of both the PA layer and substrate were in situ flexibly manipulated by regulating the DA/MPD mass ratio and solution pH. The optimized TMC/MPD–DA TFC membranes achieved a significantly enhanced water flux (50 L m−2 h−1, improved 3-fold compared to the conventional TMC/MPD membrane) and a comparable reverse salt flux of 8.19 g m−2 h−1 for forward osmosis (FO) using deionized water as the feed along with 1 M NaCl draw solution in the FO mode. It also yielded a superior water permeability (A) of 1.8 L per m2 per h per bar compared to the TMC/MPD membrane (1.0 L per m2 per h per bar) while maintaining a NaCl rejection of over 92% at 2 bar. The proposed synergistic interaction between DA and MPD in aqueous solution responding to the solution pH played a crucial role in controlling the interfacial polymerization process. Michael addition and Schiff base reaction between PDA and MPD at a proper pH (8.5) could weaken both the residual DA monomer and the PDA aggregate generation, facilitating the establishment of a defect-free and uniform PA layer with a proper cross-linking degree to enhance the water transport. This DA-incorporation strategy for the TFC membrane demonstrated here sheds light on the exploration of high water transport for highly efficient FO and other desalination processes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jiaoyun Hou,Xiangming Hu,Yanyun Zhao,Zhiang Shao,Weimin Cheng,Shucang Zhu,Chunyu Song,Fusheng Zhu
Water injection into coal seams is important for dust prevention in mines. However, owing to the hydrophobicity of coal itself, the wetting effect of water injection on coal seams has yet to be enhanced. Herein, based on the hydrophobicity of coal, hydrophilic modification of the coal surface has been proposed via co-deposition of polydopamine (PDA) and polyacrylamide (PAM). Using water contact angle (WCA) test, atomic force microscope (AFM) test, X-ray photoelectron spectroscopy (XPS) characterization, and 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR) measurements, the feasibility of hydrophilicity modification of coal by PDA/PAM has been investigated. The results indicate that when DA concentration is 2 mg/mL, deposition time is 45 min, and DA/PAM feeding molar ratio is 1:1, the wettability of modified coal sample clearly improves. In the water content test and dust-production test using gravity drop hammer, the modified coal exhibits good wettability and low dust production. Also, UV-Vis absorption spectroscopy and WCA results suggest that PDA/PAM coating exhibits good stability. Therefore, the modification method can effectively enhance the wetting effect of injected water on coal seam, providing a novel approach for dust prevention.
研究领域:
矿业工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Applied Catalysis O: Open
·
2024
·
IF 0
Jiayuan Nie,Pengyu Yin,Qiusheng Yang,Zhihui Li,Yanji Wang,Xiaoshu Ding,Dongsheng Zhang
In this study, metallic vanadium was used as catalysts for direct amination of toluene with hydroxylamine to produce toluidine under mild conditions. High toluene conversion and toluidine selectivity were obtained, corresponding to 87.62% and 96.45% respectively. Additionally, thermodynamic and kinetic calculations were carried out. It was concluded that the reaction was dominated by kinetics, with the distribution of three products being para > ortho > meta. The computational and experimental results indicated that the amination process involves an amino radical mechanism.
研究领域:
有机化学
·
催化化学
·
反应工程
✓ 已验证
DOI
FORENSIC SCIENCE INTERNATIONAL
·
2014
·
IF 2.115
Binling Zhu,Liang Meng,Kefang Zheng
Recently a new type of mixed drug oral solution has become prevalent in China, the identification and quantitative inspection of which are demanded in conviction and sentencing as well as drug intelligence. In 2013, inspection was carried out on 86 bottles of substances seized in 13 cases with the adoption of GC–MS methodology for qualitative identification and GC–FID for quantitative identification. 94.1% of the samples were light yellow turbid liquid while 95.3% were detected with more than two drugs. Detection rate of methamphetamine, MDMA and ketamine was up to 89.5%, 37.2% and 83.7% respectively. Quantitative inspection results indicated that concentrations of methamphetamine, MDMA , ketamine were 0.04–13 mg/mL, 0.04–29 mg/mL and 0.1–34 mg/mL, respectively. Appearance, composition and drug concentration of samples vary from case to case.
研究领域:
毒理学
·
分析化学
·
法医学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yun Wang,Jiayang Wang,Zhiyang Zhang,Runsheng Xu,Shuang Wang
The reductive amination of biomass-derived furfural over non-noble metal catalysts represents a promising but challenging strategy for the sustainable synthesis of furfurylamine. Herein, we report mesoporous carbon supported CoZn bimetallic catalysts (CoxZny@MC) via a one-pot solvent evaporation induced self-assembly (EISA) method for high-efficiency reductive amination of furfural to furfurylamine with hydrous hydrazine (N2H4⋅H2O) as a nitrogen source. A complete conversion of furfural with a 97.5% yield of furfurylamine was achieved over bimetallic Co1Zn3@MC catalyst under mild conditions of 100 °C and 1.5 MPa H2 for 3 h. Furthermore, Co1Zn3@MC could be reused for at least five times with only a slight loss in activity. The excellent performance of the Co1Zn3@MC catalyst was mainly attributed to the introduction of moderate Zn species, which led to high dispersion of Co particles on the catalyst surface, as well as the abundant mesopores and high specific surface area of the catalyst. Moreover, a significant electron transfer from Zn species to Co centers occurs, which improves the inherent catalytic activity of the non-noble bimetallic catalyst by enhancing the electron density of Co particles.
研究领域:
催化化学
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL COMMUNICATIONS
·
2011
·Vol. 48
·期 14
·2024-2026
·
IF 5.787
Jian Gao,Qing-Wen Song,Liang-Nian He,Zhen-Zhen Yang,Xiao-Yong Dou
An iron(III)-catalyzed three-component coupling reaction of alkynes, CH2Cl2 and amines was developed for facile synthesis of propargylamines. Preliminary mechanism investigation using in situFT-IR reveals that the crucial Fe-acetylide intermediate could be formed through C–H bond activation of alkynes thanks to cooperative effect of FeCl3 and 1,1,3,3-tetramethylguanidine.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Hengkun Zhao,Yu Feng,Jingbo Zhao
Thermoset polymers are challenging to reprocess and recycle, leading to significant environmental pollution at the end of their life. Incorporating dynamic covalent bonds into cross-linking networks offers an effective solution to these issues. In this study, a partially biobased tris(aldehyde) or tris(vanillin) monomer (TVA) was synthesized through the ring-opening reaction of vanillin with trimethylolpropane triglycidyl ether. Four H 2 N-terminated polyamides with pyridine pendent groups (PY-DAs) were synthesized by polycondensation of a pyridine-containing diester with various diamines. A series of poly(amide-imine) vitrimers with pyridine rings (PYPAIs) were then prepared by reacting TVA with PY-DAs. The incorporation of polyamide segments improved the mechanical properties and thermal stability, whereas the imine bonds provided reprocessability, degradability, and self-healing capabilities. PYPAIs show leading mechanical properties with the tensile strength up to 69.2 MPa to previous reported poly(amide–imine) vitrimers. PYPAI complexes (PYPAIs-Co 2+ ) were formed through coordination with cobalt ions, and the mechanical properties of PYPAIs-Co 2+ were further improved. PYPAIs-Co 2+ exhibited a solvatochromic property in methanol, which may make them used as potential sensor for polar solvents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Zhao Yang,Wangxi Fang,Zhenyi Wang,Ruolin Zhang,Yuzhang Zhu,Jian Jin
The wide application of lithium batteries in consumer electronics and electric vehicles bring about ever-rising demand of lithium resources globally. Nanofiltration (NF) membranes with high Mg 2+ /Li + selectivity could achieve highly efficient separation of lithium from natural brines, which provides a good alternative for steady lithium supply. In this work, we developed a dual-skin layer nanofiltration membrane comprised of a polyethylene-imine (PEI) layer grafted on a polyamide layer. The polyamide layer was prepared via interfacial polymerization to endow the NF membrane with sub-nm pores, while the PEI layer was grafted on the polyamide surface via amidation reaction to further equip the membrane with enhanced positive charge. With the synergistic effect of size sieving from the polyamide layer and electrostatic exclusion from the PEI layer, the dual-skin layer NF membrane exhibits a high rejection of 98.5% to MgCl 2 and a low rejection of 46.2% to LiCl, suggesting a high Mg 2+ /Li + selectivity. As using this dual-skin layer NF membrane for separating Li + from a simulated brine, a high Mg 2+ /Li + separation factor (S Mg , Li ) up to 33.4 was achieved, which is the highest value among the pressure-driven polymeric nanofiltration membranes reported so far.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2020
·Vol. 37
·期 2
·267-274
·
IF 2.049
Ghoto Saima Ameen,Khuhawar Muhammad Yar
A convenient and uncomplicated scheme has been projected for the quantitative determination of essential diamines putrescine (PUT) and cadaverine (CAD) via sodium dodecyl sulfate protected silver nanoparticles (SDS-AgNPs). This scheme is based on the chemical interaction of a SDS-AgNPs probe with PUT and CAD, leading to a color change from yellow to red or reddish brown. The interaction was investigated through different techniques such as using a UV-visible spectrophotometer, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), dynamic light scattering spectroscopy (DLS) and the zeta potential. Both amines possess a close resemblance in structure (except for the addition of one more methylene group in CAD), and no any distinguishable color change was noted. However, the maximum absorption band at 580 and 600 nm was demonstrated for PUT and CAD correspondingly. The methodical response was observed at absorption ratios of 580/410 and 600/410 nm, with the linear regression within 4–12 and 6–14 μg/mL for PUT and CAD. The detection limits calculated for both the diamines PUT and CAD were 0.333 and 1.638 μg/mL. The scheme was successfully applied for determinations in biological samples, including spiked blood plasma and urine. Putrescine exhibited % recovery within 95.717–105.200%, while cadaverine was within 95.940–105.109%, respectively. The scheme was reproducible and precise with inter-day RSD ( n = 5) within 1.126, 0.018% and the intraday RSD ( n = 5) was within 0.005, 0.002% for PUT and CAD, respectively.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2019
·Vol. 11
·期 4
·810-819
·
IF 4.76
Akram Yasin,Yurong Chen,Yanxia Liu,Letao Zhang,Xingjie Zan,Yagang Zhang
Different from traditional polyethylenimine (PEI) modified Hg(II) adsorbent materials, a novel hyperbranched polythioamide adsorbent (SPD) was prepared by using sulfur, PEI and 1,4-diethynylbenzene (DEB) as monomers. There are tens and thousands of tons of sulfur produced from oil refinery processes as a major by-product each year, and its utilization becomes a concern due to its limited consumption, environmental problems and safety. Herein, a SPD was fabricated through a one-pot, catalyst-free polymerization which even can be solvent-free via using sulfur to solidify the liquid PEI. A kinetic study showed that the adsorption of Hg(II) ions followed the pseudo-second-order model, indicating chemical adsorption between Hg(II) ions and SPD. The SPD had a maximum adsorption capacity of 1161.99 mg g−1. FT-IR and XPS measurements indicated that the removal of Hg(II) by SPD was mainly controlled by the coordination interaction between Hg(II) ions and nitrogen groups (i.e., amine and imine groups), and also CS bonds of SPD. By using elemental sulfur, PEI becomes the backbone of the polymer system by forming –C(S)NH– and –C(S)N< groups unlike the grafted part of traditional PEI modified materials. TG, DTG, and DSC measurements showed that the main degradations occurred at around 160 °C and 360 °C.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）