Coatings
·
2023
·Vol. 14
·期 1
·28
·
IF 3.4
Yaling Deng,Yu Xu,Lei Nie,Yiyang Huang
The development of coatings with efficient lubrication and load-bearing capacity is an urgent need for artificial joints. Here, we successfully fabricated poly (acrylic acid-co-acrylamide)/polyethyleneimine (P(AA-co-AAm)/PEI) coating on titanium alloy (Ti6Al4V) surface via UV irradiation and thermal treatment technique. The dual crosslinked network structures were composed of a P(AA-co-AAm) network via free radical polymerization and a PAA-co-PEI network via thermal crosslinking of amine and carboxyl groups. The thermally crosslinked P(AA-co-AAm)/PEI coatings exhibit a stable low friction coefficient (approximately 0.022) and exceptionally low wear volume, with a 93.8% and 92.6% reduction, respectively, in comparison to the pristine Ti6Al4V. These thermally crosslinked P(AA-co-AAm)/PEI hydrogel coatings exhibit excellent lubrication and anti-wear properties, providing a strategy for developing novel lubricating coatings in the biomedical field.
研究领域:
生物材料学
·
表面工程学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Geoenergy Science and Engineering
·
2023
·
IF 0
Hanyi Zhong,Shusen Li,Wenlei Liu,Zhengsong Qiu,Ying Guan,Weian Huang
Effective filtration loss control under high temperature and high salinity environments is a great challenge in oil and gas drilling engineering. In this study, a core-shell structural nano-composite (CSNC) using precipitated nano-CaCO 3 as the core material and cross-linked polymer between acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA) and methylene-bis-acrylamide (MBA) as the shell was prepared by reverse emulsion polymerization . The structure of CSNC was characterized with Fourier infrared spectrum (FT-IR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), transmission electron microscope (TEM) and particle size distribution analysis. The filtration control properties of CSNC particles were investigated in both aqueous solution and bentonite suspension with various contents of NaCl and CaCl 2 respectively. The high temperature and high pressure (HTHP) filtration properties between CSNC and typical high temperature resistant filtration reducers were compared. The filtration controlling mechanism of CSNC particles were probed through zeta potential analysis, X-ray diffraction (XRD) analysis and filter cake morphologies observation. The results indicated that for the 4% w/v bentonite suspension treated with 3% w/v CSNC, the low temperature and low pressure (LTLP) filtration loss and filter cake thickness decreased by 84.2% and 76.1% respectively after thermal aging at 220 °C. When the bentonite suspension was contaminated with 30% w/v NaCl and 0.5% w/v CaCl 2 respectively, incorporation of 1% w/v CSNC reduced the filtration loss by 72.5% and 86.9% after thermal aging at 200 °C. The core-shell structure, cross-linked structure, and salt tolerant sulfonic acid groups on the outer surface of CSNC in combination contributed to extraordinary filtration loss control under stringent high temperature and high salinity conditions.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
LUMINESCENCE
·
2017
·Vol. 33
·期 1
·138-144
·
IF 1.509
Liping Zhang,Jianguo Zhang,Hongqi Chen,Lun Wang
An redox luminescence switch was developed for the sensing of glutathione (GSH), l -cysteine (Cys) or l -ascorbic acid (AA) based on redox reaction. The Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanorods (UCNRs) with an emission peak located in the red region were synthesized. The luminescence intensity of the UCNRs could be quenched due to the Mn 2+ could be oxidized to MnO 2 by KMnO 4 . Subsequently, when the AA, GSH or Cys was added into the MnO 2 modified upconversion nanosystem, which could reduced MnO 2 to Mn 2+ and the luminescence intensity was recovered. The concentration ranges of the nanosystem are 0.500–3.375 mM (R 2 = 0.99) for AA, 0.6250–11.88 mM (R 2 = 0.99) for GSH and 0.6250–9.375 mM (R 2 = 0.99) for Cys, respectively.
研究领域:
分析化学
·
纳米技术
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2023
·
IF 3.1
Xin-Xin Dong,Tao-Li Chen,Xiangjuan Kong,Shuang Wu,Fang-Fang Kong,Qiang Xiao
In this work, a facile fluorescence Eu3+-based metal organic frameworks (Eu MOF) sensor for ascorbic acid (AA) and ascorbate oxidase (AAO) detection was developed. The fluorescence of Eu MOF could be effectively quenched by Ce3+ but not Ce4+ at an appropriate concentration, thus, when the reductant AA was added into the solution containing Ce4+, Ce4+ was chemically reduced to Ce3+, which induced the decreased fluorescence signal of Eu MOF. However, when AAO was introduced, AA was effectively oxidized to dehydroascorbic acid (DHAA) under the catalysis of AAO, thus, Ce4+ could not be reduced, resulting in the fluorescence restore of Eu MOF. Hence, the concentration of AA and AAO could be determined by the fluorescence decrease and restore of Eu MOF. The fluorescent platform showed high sensitivity with the limit of detection of 0.32 µM for AA and 1.18 U/L for AAO, respectively. Moreover, the proposed method was successfully applied for AA and AAO determination in real samples, indicating great potential for biomedical application in complex matrices.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Shengyuan Zhang,Haiyan Li,Dezhi Yang,Yaling Yang
In the present research, Fe-based metal-organic frameworks (MIL-101(Fe)–NH 2 ) nanoparticles were synthesized by simple solvothermal methods and used to assay Cr(Ⅵ). The MIL-101(Fe)–NH 2 performs dual functions: the 2-aminoterephthalic acid (NH 2 -BDC) ligand endows a strong fluorescence emission, and the Fe metal nodes are able to facilitate the oxidation of 3,3′,5,5′- tetramethylbenzidine (TMB) directly, resulting in the generation of oxidized-TMB (ox-TMB). Our research results showed that reducing agents such as ascorbic acid (AA) can collapse the structures of MIL-101(Fe)–NH 2 because of the reduction of Fe 3+ by AA, resulting in release of NH 2 -BDC. In the presence of Cr(Ⅵ), the fluorescence intensity of the MIL-101(Fe)–NH 2 + AA system will be decreased due to the competitive reduction of Fe 3+ and Cr(Ⅵ). Nevertheless, Cr(Ⅵ) can significantly accelerate the oxidation of TMB by MIL-101(Fe)–NH 2 as it boosts the electron transfer rate between Fe 3+ and Fe 2+ . Therefore, a fluorescent/colorimetric dual-mode platform was developed for the detection of Cr(Ⅵ) with an extensive linear range (7.5–750 μg/L and 13.3–1000 μg/L) as well as a remarkably low detection limit (0.99 μg/L and 1.98 μg/L). This MOF with the ability to release ligands not only provides inspiration for the design of new luminescent materials, but also offers a novel and reliable solution for the detection of Cr(Ⅵ).
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2023
·
IF 7
Wenbo He,Zhaoyang Yao,Youlu Diao,Miao Wang,Guoqing Pan
Reversible binding of cell targeting motifs on biomaterial surfaces can be used to mimic the dynamic bioactivities of the extracellular matrix (ECM), thus showing potential to modulate cell behaviours in physiopathologic processes. As the markers of tumour metastasis, circulating tumour cells (CTCs) are especially essential for the diagnosis of cancer. Dynamic display of cancer targeting motifs on biometric interfaces thus enables specific isolation of rare cancer cells and delivery of critical information for cancer therapy. In this work, we report a dynamic biointerface for the reversible binding of cancer-targeting motifs on quartz through molecular recognition between the natural glycopeptide vancomycin (Van) and the D-alanine-D-alanine (AA) dipeptide. This active surface could not only realize specific cancer cell adhesion but also induce nondestructive cell detachment by the competitive addition of the free AA dipeptide. The cell isolation efficiency in the medium could reach 70% within 120 min, showing high specificity and separation efficiency. Furthermore, the dynamic display of cancer-targeting motifs on magnetic beads enabled magnetic cancer cell capture and AA dipeptide-triggered cell release. Therefore, the natural dynamic strategy using noninvasive glycopeptide recognition holds promise for rare cell detection, isolation and cell-based disease diagnosis.
研究领域:
生物材料
·
癌症研究
·
细胞生物学
·
分子识别
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yaxin Li,Wei Qin,Xinyang Li,Qi Zhu,Fu-quan Bai,Tao Tian
It is highly desirable to enhance the charge separation and introduce catalytic functions for efficient water splitting into hydrogen on g-C 3 N 4 . Herein, heterojunctions of PCN-222(M)/g-C 3 N 4 -AA were successfully synthesized through the in-situ hydrothermal method, where metallic ions (M) were strategically incorporated into porphyrinic metal-organic framework (MOF) ligands. This heterojunction design strategy is considered to establish directional charge transfer channels for photogenerated electron-hole (e − -h + ) pairs and thereby enhance its separation efficiency. Remarkably, the 1 % PCN-222(Pd)/g-C 3 N 4 -AA composite demonstrated superior photocatalytic hydrogen evolution performance, achieving a rate of 2338.17 μmol·g −1 ·h −1 . This rate was 3.23 times higher than that of pure g-C 3 N 4 and 2.79 times higher than that of g-C 3 N 4 -AA. The composite morphology was characterized by a series of physicochemical properties. Bandgap analysis via Tauc plot revealed that metal ion doping in the porphyrin center effectively modulates the HOMO-LUMO levels at the composite interface. First-principles calculations coupled with hydrogen adsorption free energy analysis elucidated how interfacial engineering between PCN-222(M) and g-C 3 N 4 -AA governs heterostructure formation and charge transfer pathways. This work systematically deciphers the synergistic effects of bimetallic MOF integration and provides insights into the underlying photocatalytic reaction mechanism.
研究领域:
材料科学
·
纳米技术
·
催化
·
能量转换
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Peng Bo Niu,Yong Qiong Wang,Rong Hu,Tong Yang
With the improvement of the quality of life, the assessment of total antioxidant capacity (TAC) has attracted much attention in the field of a healthy diet, food analysis, or health guidelines. In this work, Cu nanoparticles (NPs)/CoO/carbon nanofibers (CNFs) as a promising nanozyme for peroxidase (POD) mimicking was synthesized by electrospinning and carbonation. Subsequently, a colorimetric sensing platform is constructed for TAC assessment by using 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogenic substrate based on Cu NPs/CoO/CNFs under presence of H2O2. The enhanced POD catalytic efficiency of Cu NPs/CoO/CNFs for TMB oxidation (ox-TMB) was about 3.2-fold higher than that of bare Cu NPs/CNFs or CoO/NFs, which was ascribed to the synergistic catalytic effect and the generation of heterogeneous interfaces between Cu NPs and CoO in CNFs. When some antioxidants such as AA, FA, TA, and GA were introduced in the chromogenic system, ox-TMB was reduced to colorless TMB, allowing the subsequent assessment of TAC. The results show that the limits of detection toward AA, FA, TA, and GA were 8.7, 8.3, 2.7, and 2.4 μM, respectively. Moreover, this proposed method was used for the TAC assay in real samples including fresh juices and commercial beverages, which showed good promise in practical applications such as food nutrition assessment, food analysis, personalized nutrition intervention, or staple food research.
研究领域:
材料科学
·
分析化学
·
食品科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xinyou Zhang,Yutong Yang,Jianxin Wang,Jianjiao Xin,Wendi Wang,Yao Chen,Guangming Yin,Hong Pan
Among various cathode materials, sulfurized polyacrylonitrile (SPAN) is considered a highly promising cathode for Lithium-sulfur (Li-S) batteries due to its unique covalent sulfur fixation mechanism, which fundamentally suppresses polysulfide dissolution and the shuttle effect. However, conventional SPAN materials typically limit sulfur chains to short S 2 -S 4 structures to maintain a solid-solid reaction, restricting their theoretical capacity. Moreover, the material's insulating nature and significant volume changes during cycling greatly limit its electrochemical performance and practicality. To address these issues, this study designed and synthesized a high-elasticity water-based binder based on a 2-ethylhexyl acrylate/acrylic acid/methyl methacrylate (2-EHA-AA-MMA) terpolymer. Abundant carboxyl groups (-COOH) in its molecular chain form stable S-O covalent bonds with sulfur chains in SPAN. Combined with PAN's terminal fixation of sulfur chains, this achieves a synergistic “long-chain capacity enhancement and strong anchoring shuttle suppression” effect. It stabilizes long S 6 chains, improving cycling stability and reversible capacity, while also directing S 6 conversion directly to Li 2 S 3 , bypassing soluble Li 2 S 4 intermediates to suppress shuttle effects at the source. Experimental results show that the SPAN cathode with this binder delivers a high specific capacity of 850.3 mAh g −1 at 0.1 C, with 68.4% capacity retention after 100 cycles and effective polysulfide shuttle suppression.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Luyao Su,Jie Mao,Sui Wang,Yufang Hu
Herein, the paper developed a bimodal electrochemiluminescence (ECL) method based on dual-enhancement Ru(bpy) 3 2+ /CQDs/AA system combined with magnetic field enhanced solid-phase microextraction (MFE-SPME) for the direct determination of ascorbic acid (AA). The nanocomposite of Fe 3 O 4 @CS@GO, as a magnetic adsorbent, could efficiently extract AA under the external magnetic field provided by the magnetic glassy carbon electrode (MGCE) with the extraction efficiency up to 89.2%. Based on carbon quantum dots (CQDs) as the co-reactant for Ru(bpy) 3 2+ , when the potential was swept cyclically between −3.5 and 2.0 V, the bimodal ECL emissions were obtained in the Ru(bpy) 3 2+ /CQDs/AA system and were enhanced as AA concentration increased. The method could quantitatively detect AA, because the ln(ECL-1/ECL-2) of bimodal ECL system was in a good linear relationship with the negative logarithm of the AA concentration in the range of 10 −5 –10 −9 M with the limit of detection (LOD, S/N = 3) of 330 pM. After a series of evaluations, the method exhibited good sensitivity, satisfactory repeatability and excellent anti-interference, demonstrating that the developed method had great application potential in analysis fields.
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
RSC Advances
·
2021
·Vol. 11
·期 28
·17283-17290
·
IF 3.361
Shuai Zhang,Cong Zhang,Xiaodong Shao,Rentian Guan,Yingying Hu,Keying Zhang,Wenjing Liu,Min Hong,Qiaoli Yue
A fluorometric method was proposed for the determination of Fe3+ and ascorbic acid (AA) based on blue and red dual fluorescence emissions of glutathione (GSH) stabilized-gold nanoclusters (AuNCs). AuNCs were synthesized from GSH and tetrachloroauric acid. The fluorescence peaks of AuNCs were at 425 nm and 585 nm, respectively. In the presence of Fe3+, the fluorescence peak at 425 nm can be enhanced and that at 585 nm can be quenched. There is a good linear relationship between the fluorescence intensity ratio for the 425 and 585 nm peaks (F425/F585) and the concentration of Fe3+ in the range of 0.75–125 μM. However, when AA was added to the AuNCs–Fe3+ system, the value of F425/F585 decreased consistently with the concentration of AA in the range of 0.25–35 μM. The limit of detection for Fe3+ and AA was 227 and 75.8 nM, respectively. The interaction between AuNCs and Fe3+ can induce the ligand–metal charge transfer (LMCT) effect leading to the fluorescence increment at 425 nm, while AA can reduce Fe3+ to Fe2+. The production of Fe2+ can not enhance or quench the fluorescence of AuNCs. By comparison with previous literature, the AuNCs prepared here show two fluorescence peaks without additional fluorescence labels. Furthermore, the method was successfully applied in the determination of Fe3+ and AA in some real samples, such as water, human serum and tablets.
研究领域:
分析化学
·
纳米技术
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Tao Zhang,Wenhui He,Xiaodan Song,Dongzhi Wu,Yaokun Xia,Yan Liu,Linzhao Wu,Weiming Sun,Fengfei Lin,Jinghua Chen
Currently, organic artificial enzymes as biocatalysts have been extensively used to construct various colorimetric sensors. However, exploiting a potential organic artificial enzyme with high catalytic efficiency still remains a challenge. To address this issue, herein, we synthesize an acridone derivative 10-benzyl-2-amino-acridone (BAA). The synthesized BAA exhibits an intrinsic visible-light-stimulated oxidase-like activity, which is capable of oxidizing various chromogenic substrates without destructive hydrogen peroxide (H 2 O 2 ) under visible light stimulation , resulting in colored products. The reaction system can be regulated by switching light on and off, which is milder and more reliable means than others H 2 O 2 -dependent. The photocatalytic mechanism of BAA is investigated in detail. However, l -ascorbic acid (AA), an antioxidant generating from the acid phosphatase (ACP)-mediated hydrolysis of 2-phospho- l -ascorbic acid (AAP), is able to inhibit the catalytic activity of BAA. Based on the above properties, a facile, photo-switchable and low-cost colorimetric sensing strategy is developed for ACP detection. The linear range is 0.05–2.5 U/L (r = 0.9994), and the limit of detection (LOD) is 0.0415 U/L. Moreover, the proposed sensing system can be applied for monitoring ACP activity in practical samples, demonstrating promising applications in clinical analysis and biosensor platform.
研究领域:
生物化学
·
分析化学
·
生物技术
·
传感器
✓ 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）