Protection of Metals and Physical Chemistry of Surfaces
·
2018
·Vol. 54
·期 5
·917-925
·
IF 0.681
Guo Lei,Wu Min,Leng Senlin,Qiang Yujie,Zheng Xingwen
The mutually corroborated electrochemical measurements and theoretical calculations were used to investigate the corrosion inhibition performances of purpald (4-amino-3-hydrazino-5-mercapto-1,2,4-triazole, AHMT) and its synergistic effect with tartaric acid (TA) on mild steel in 0.5 M H 2 SO 4 solution. The experimental results show that the inhibition efficiency increases with the concentration of AHMT and increases further when TA exists. Density functional theory (DFT) calculations were performed to interpret the measured data and trends observed in the electrochemical studies. Furthermore, molecular dynamic simulation revealed a nearly flat configuration for molecules on metal surface with negative adsorption energies in a sequence agreed with experimental observation.
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Journal of Energy Storage
·
2024
·
IF 8.9
Yisheng Hu,Zheng Liu,Fei Zhao,Dongdong Ji,Bailing Jiang,Mingyang Hu,Bo Ma,Ziyang Yan
The positive deposit layer is passivated to seriously affect the service life of soluble lead flow batteries . Based on the oxidation reaction of high valence Cobalt ions in the electrocatalytic OER process, Pb 2+ can be oxidized to form Pb 4+ that reduces the formation of the passivation layer. The hydroxyl radical adsorbed by Co 3/4+ is disaffiliated from the active site. It is conducive to the formation of lead dioxide . In this work, a dense and flat sedimentary layer is obtained on the carbon fiber by adding 5 mmol·L −1 of Co 2+ . The tartaric acid with a delocalized structure is used to improve the conductivity and reduce the impedance of the sediment layer. As a result, the average coulomb efficiency of the flow cell reaches 97.8 %, and its average energy efficiency is 80.9 % in 100 cycles. It would provide a theoretical basis for improving the cycle life of soluble lead flow batteries .
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Materials
·
2025
·Vol. 18
·期 15
·3473
·
IF 3.2
Yutong Zhou,Zheng Zhou,Lvchao Qiu,Kuangda Lu,Dongmei Xu,Shiyuan Zhang,Shixuan Zhang,Shouwei Jian,Hongbo Tan
Organic acids could act as retarders in magnesium oxysulfide (MOS) systems, not only delaying setting and improving fluidity but also enhancing compressive strength and water resistance. These effects are generally attributed to both the presence of H+ions and anion chelation. However, the enhancement efficiency of different organic acids in MOS systems varies significantly due to differences in their molecular structures. To determine the underlying mechanism, this study comparatively investigated the effects of amino trimethylene phosphonic acid (ATMP) and tartaric acid (TA) on the setting time, fluidity, compressive strength, and water resistance of the MOS system, with the two additives incorporated at mole ratios to MgO ranging from 0.002 to 0.006. The mechanism behind it was revealed by discussion on the hydration heat, hydrates, and pH value. Results showed that both ATMP and TA could effectively improve the fluidity, delay the setting process, and enhance the mechanical properties, including strength and water resistance. At a mole ratio of 0.006, the incorporation of ATMP increased the 28 d compressive strength and the softening coefficient by 214.12% and 37.29%, respectively, compared with the blank group. In contrast, under the same dosage, TA led to an increase of 55.13% in the 28 d strength and 22.03% in the softening coefficient. Furthermore, hydration heat, product analysis, and pH measurements indicated that both ATMP and TA inhibited hydration during the initial hours but promoted hydration at later stages. The potential reason could be divided into two aspects: (1) H+ions from ATMP and TA suppressing the formation of Mg(OH)2; (2) anion chelation with Mg2+in the liquid phase, leading to a supersaturated solution with higher saturation, which further hindered Mg(OH)2formation and facilitated the later development of 5Mg(OH)2·MgSO4·7H2O (517 phase). By contrast, under the same mole dosage of H+or anions, the enhancement in compressive strength as well as the water resistance is superior when using ATMP. This was owing to its stronger chelating ability of ATMP, which more effectively inhibited Mg(OH)2formation and then promoted the formation of the 517 phase. These findings confirm that the chelating ability of anions exerts an important impact on the retarding effect as well as the enhancement of strength in MOS systems.
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EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
·
2024
·
IF 4.4
Lixin Liu,Yuning Wang,Jiuyi Sun,Yunan Zhang,Xiangyu Zhang,Lili Wu,Yingli Liu,Xuan Zhang,Yidi Xia,Qiumei Zhang,Ning Gao
To improve the solubility of the fluoroquinolone drug fleroxacin (FL), based on the previous experience of our research group in synthesizing co-crystals/salts of quinolone drugs to improve the physicochemical properties of drugs, Fleroxacin-D-tartaric acid dihydrate salt (FL-D-TT, C 17 H 19 F 3 N 3 O 3 ·C 4 H 5 O 6 ·2(H 2 O)), was synthesized for the first time using fleroxacin and D/L-tartaric acid (D/L-TT). Structural characterization of FL-D-TT was carried out using single-crystal X-ray diffraction, infrared spectral analysis (FT-IR) and powder X-ray diffraction (PXRD). Molecular electrostatic potential analysis showed that D-tartaric acid interacted more readily with FL than L-tartaric acid. The solubility of FL-D-TT (9.71 mg/mL, 1.82 mg/mL) was significantly higher compared to FL (0.39 mg/mL, 0.71 mg/mL) in water and buffer solution at pH 7.4. This may be attributed to the formation of charge-assisted hydrogen bonds (CAHBs) between FL and D-TT that facilitates the dissociation of FL cations in the dissolution medium, leading to an increase in FL solubility. This also led to some improvement in the in vitro antimicrobial activity of FL-D-TT against E. coli , S. typhi , and S. aureus. In addition, the hygroscopic stability of FL has been improved. Surprisingly, FL-D-TT had better photostability than FL, which could be attributed to the introduction of D-TT to make the photosensitizing moiety of FL more stable, which led to the improvement of the photostability of FL.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xin Zhang,Xin Liu,Ziting Lin,Guangze Sun,Zihan Bian,Huan Liu,Aihua Liu
Nanozymes hold great promise in catalysis-based sensing, however, challenges remain due to their less specificity and unclear catalytic mechanisms, which limited their potential applications. Herein we report an ultrasensitive colorimetric/fluorescence dual-mode tartaric acid (TA) sensor based on hydroxy-iron oxide (FeOOH) nanorods (NRs)@carbon dots (CDs) nanocomposite incorporating with acid phosphatase (ACP). The peroxidase (POD)-like activity of FeOOH can catalyze H 2 O 2 to generate OH, which can further oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue oxTMB, while the fluorescence of CDs can be quenched by the assembled FeOOH NRs through internal filter effect. The FeOOH@CDs can effectively transfer electron enabling high catalytic activity, which is supported by Cytochrome c as an electron transporter. ACP can hydrolyze trisodium L-ascorbate-2-phosphate salt (AAP) to produce ascorbic acid (AA), which increases colorimetric signal generated by FeOOH@CDs. Interestingly, TA can inhibit ACP activity through strong complexation and reduce the generated AA, by which most ox-TMB could not be restored. Meanwhile, the generated AA could reduce FeOOH to collapse into Fe 2+ , enabling the assembled CDs dropping-off into solution and restored fluorescence. However, TA can inhibit the ACP activity, which prevents fluorescence recovery. A colorimetric/fluorescence dual-mode sensing was established by cascading ACP/POD mimics. The limits of detection are 0.83 μM and 22.8 μM (3σ/S) for the fluorescence mode and colorimetric mode, respectively. The as-proposed method was applied to detect TA in wine samples, consistent well with the results of HPLC. This work not only expands nanozyme’s potential applications in catalysis and sensing, but also provides a potential platform for rapid TA detection for food control.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qi Zhang,Siru Ren,Ang Li,Jing Zhang,Song Xue,Xiaodong Sun
Ionic liquids (ILs) have proven to be a promising alternative to traditional chiral selectors in chiral capillary electrophoresis (CE). However, the number of IL-type chiral selectors currently available is quite limited and their types of structure are generally restricted to tetraalkylammonium salts. In this work, six tartaric acid (TT)-based ILs (TTILs) were designed containing different cation species, including di-1-butyl-3-methylimidazolium-L-tartrate ([BMIM] 2 -L-TT), di-1-butyl-pyridinium-L-tartrate ([BPY] 2 -L-TT), di-tetrabutylphosphonium-L-tartrate ([TBP] 2 -L-TT), di-choline-L-tartrate ([CHO] 2 -L-TT), di-1-butyl-1-methylpiperidinium-L-tartrate ([BMPIP] 2 -L-TT), and di-1-butyl-1-methylpyrrolidinium-L-tartrate ([BMPYR] 2 -L-TT). These novel IL-type chiral selectors were successfully synthesized and applied to the enantioseparation of ten amino alcohols in CE . Under selected CE conditions (60 mM TTILs, 150 mM boric acid in 80–90% methanol, pH 4.5), [BMPIP] 2 -L-TT showed the best chiral separation performance, followed by [BMPYR] 2 -L-TT and [TBP] 2 -L-TT. Most amino alcohols were resolved with enantioresolutions (Rs) above 4.0. The enantioselectivity demonstrated by [CHO] 2 -L-TT was relatively moderate (Rs ranging from 1.50 to 4.50), but it proved that the suppression of electroosmotic flow (EOF) is not the main contribution of TTILs to chiral CE. The enantioselectivities of [BMIM] 2 -L-TT and [BPY] 2 -L-TT were also shown to be satisfactory but their interference with UV detection is a negative factor in CE application. To the best of the authors’ knowledge, this is the first time that the influence of various achiral cation species of IL-type chiral selectors on CE enantioseparations has been systematically evaluated. Since there has been controversy regarding the true role of chiral ILs in CE enantioseparations, the parallel comparison of these TTILs in this work clearly shows that their cations are able to participate in the enantiorecognition process by introducing steric hindrance effect, rather than merely influencing the EOF in the separation systems.
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-14
·
IF 5.228
Qiang Yujie,Guo Lei,Zhang Shengtao,Li Wenpo,Yu Shanshan,Tan Jianhong
The inhibitive ability of 2,6-diaminopyridine, tartaric acid and their synergistic effect towards mild steel corrosion in 0.5 M HCl solution was evaluated at various concentrations using potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and weight loss experiments. Corresponding surfaces of mild steel were examined by atomic force microscope (AFM), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) analysis. The experimental results are in good agreement and reveal a favorable synergistic effect of 2,6-diaminopyridine with tartaric acid, which could protect mild steel from corrosion effectively. Besides, quantum chemical calculations and Monte Carlo simulation were used to clarify the inhibition mechanism of the synergistic effect.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121277
·
IF 7.2
Caifeng Xia,Siyuan Liu,Qikang Yin,Sen Liu,Bo Liao,Shuxian Wei,Zhaojie Wang,Zhe Sun,Xiaoqing Lu
The performance of mixed matrix membranes (MMMs) depends largely on the structure and composition of incorporated nanofillers. However, it remains challenging to achieve efficient separation performance with uniform filler dispersion and strong interfacial compatibility within the polymer matrix. In this study, an ionic liquid-modified hollow microsphere of tartaric acid anion-intercalated layered double hydroxide (IL@HMS TA-LDH) was designed and embedded into a PIM-1 matrix to fabricate IL@HMS TA-LDH/PIM-1 MMMs for efficient CO 2 separation. The hollow microstructure and anion-rich interlayers of LDH provide multiple facilitated transport pathways for CO 2 significantly enhancing both permeability and selectivity. Experimental and theoretical calculation results confirm that IL modification on HMS TA-LDH not only improved the interfacial compatibility between the polymer and the filler but also enhanced CO 2 affinity and the CO 2 /N 2 selectivity. The resulting MMMs surpassed the 2019 Robeson upper bound and showed good stability. The separation efficiency of the optimal 5.0 % IL@HMS TA-LDH/PIM-1 MMMs was the best (CO 2 permeability was 8550.73 ± 367.54 Barrer, CO 2 /N 2 selectivity was 40.75 ± 1.83), outperforming most of the other reported MMMs. This work offers a new strategy for designing high-performance CO 2 capture membranes by combining hollow-structured LDH with functionalized ionic liquids.
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AAPS PHARMSCITECH
·
2022
·Vol. 23
·期 7
·1-10
·
IF 4.026
Lv Jianhua,Ou Xiaoyu,Fang Yaru,Wu Mi,Zheng Fanghao,Shang Lei,Lei Kaijun,Liu Yunen,Zhao Yan
Deep eutectic solvents (DESs) based on choline chloride (C) and l -(+)-tartaric acid diethyl ester (L) were prepared and used in transdermal drug delivery system (TDDS). The internal chemistry structure including the formation and changes of hydrogen bonds of choline chloride and l -(+)-tartaric acid diethyl ester DES was characterized via attenuated total reflection Fourier transform infrared (ATR-FTIR) and 1 H nuclear magnetic resonance ( 1 H NMR) spectroscopy. The stoichiometric ratio of choline chloride to l -(+)-tartaric acid diethyl ester as well as water content affected the viscosity, glass transition temperature ( T g ), and drug solubility of the DES. The viscosity and glass transition temperature of the DES (CL14) prepared at the ratio of 1:4 of choline chloride to l -(+)-tartaric acid diethyl ester were 1.19 Pa·s and − 44.01°C, respectively, and decreased to 0.10 Pa·s and − 55.31°C when 10% water (CL1410) was added. Taking diclofenac diethylamine (DDEA), the nonsteroidal anti-inflammatory drug as model, drug solubility was as high as 60 mg/ml and 250 mg/ml in CL14 and CL1410, respectively. The cumulative amount of DDEA was 4.63 ± 2.67 μg/cm 2 and 15.27 ± 4.63 μg/cm 2 for CL14 and CL1410, respectively, at 8 h. The mechanism of percutaneous permeability by the DES may be the disturbance of stratum corneum (SC) lipids as well as changes in the protein conformations. CL14 and CL1410 were also verified as low-cytotoxic and nonirritant. Therefore, the DESs studied are promising to be used in drug solubilization enhancement and transdermal drug delivery system. Graphical abstract
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CEMENT AND CONCRETE RESEARCH
·
2022
·
IF 11.958
Fang Sun,Xueyu Pang,Shiho Kawashima,Guodong Cheng,Shenglai Guo,Yuhuan Bu
In order to study the abnormal viscosity evolution behavior of oil well cement slurries containing tartaric acid, the influence of tartaric acid on the early-age hydration of oil well cement at high temperatures was investigated by isothermal calorimetry (IC), thermogravimetric analysis (TGA) and quantitative XRD (QXRD) analysis in the temperature range of 60 °C to 89 °C. Results show that, a high dosage of tartaric acid can fundamentally change the typical shape of the cement hydration heat flow curve - two additional exothermic peaks associated with aluminate phase hydration (C 3 A and C 4 AF) appear before the main hydration peak. The unsynchronized hydration of the aluminate phases and the silicate phases was found to be the cause of premature setting. Additionally, long-term curing study (up to 28 d) showed that increasing the dosage of tartaric acid decreased the ultimate hydration extent of C 2 S while it increased the ultimate hydration extent of C 4 AF.
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POLYMER TESTING
·
2019
·
IF 2.943
Shuidong Zhang,Yan He,Zesheng Lin,Jun Li,Guo Jiang
Poly (butyleneadipate-co-terephthalate)/thermoplastic starch with high performances was a candidate alternative for polyethylene . In this study, starch, glycerol and tartaric acid (TA) were extruded to fabricate thermoplastic starch/TA (TPS-TA) firstly, then re-extruded with PBAT to achieve PBAT/TPS-TA composites. Effects of TA contents on the structure of TPS, the phase morphology and performances of PBAT/TPS-TA were evaluated by Fourier transform infrared spectroscopy (FT-IR), dynamic thermomechanical analysis (DMA), scanning electron microscopy (SEM), viscosity, dynamic rheological and in vitro biodegradation measurement, contact angle and tensile test, respectively. When its content ranged from 0.5 to 1%, TA acted as acid catalyst to reduce the molecular weight of starch and shear viscosity of TPS, meanwhile, served as coupling reagent to improve the compatibility of TPS and PBAT matrix. Consequently, TPS-TA particles uniformly dispersed in PBAT matrix with 0.18 μm diameter and PBAT/TPS-TA could achieve the homogeneous phase and improved tensile properties . However, when TA content was higher than 1%, the excessive TA would decrease the interface interaction and caused the morphology of PBAT/TPS-TA to reverse from homogeneous phase to “sea-island structure”. This study paved the way for fabricating low-cost PBAT/TPS-TA with 15 times and 40% increments in biodegradation rate and ductility, respectively, when PBAT was used as the control.
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ADVANCES IN POLYMER TECHNOLOGY
·
2018
·Vol. 37
·期 8
·3038-3044
·
IF 2.073
Wensheng Tan,Renjun Fu,Hong Ji,Datong Wu,Yueguo Xu,Yong Kong
Polyaniline (PANI) is chemically synthesized using two low-molecular-weight organic acids (D-tartaric acid and citric acid) as the dopants, respectively. The doped PANI is characterized by field emission scanning electron microscopy, FT-IR spectra, and X-ray diffraction. The two doped PANIs exhibit different electrochemical properties, especially in the supercapacitive behaviors. Compared with citric acid-doped PANI, D-tartaric acid-doped PANI shows higher specific capacitance (525 F/g at 1 A/g) and cyclic stability. The good electrochemical behaviors of D-tartaric acid-doped PANI might be attributed to the two carboxyl groups of D-tartaric acid, which are beneficial to the oriented growth of PANI chains. The results demonstrate that compared with citric acid, D-tartaric acid is a promising dopant for PANI used in supercapacitors.
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