Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
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IF 4.706
Yuzhen Sun,Huifang Bi,Tao Wang,Leilei Sun,Zexin Li,Haining Song,Fenglei Sun,Haifeng Zhou,Guangjun Zhou,Jifan Hu
NaYF 4 :10Er/0.5Ho/30Ca@NaYF 4 is designed to achieve up-conversion luminescence color adjustment under 980 nm excitation. Ho 3+ doping enhances the red emission level of the system and changes the characteristic green emission into red emission. Importantly, Ho 3+ doping increases the difference in pumping time between green and red excited states. Under short pulse-width laser excitation, the red excited state does not have enough time to be populated, which weakens the emission of red emission, and the ratio of green to red emission will change. It is an effective up-conversion luminescence enhancement method to change the symmetry of crystal field around lanthanide ions by doping Ca 2+ . The green and red emission intensities of NaYF 4 :10Er/0.5Ho/30Ca doped with 30% Ca 2+ ions are 9.0 and 6.3 times higher than those of Ca 2+ free samples, respectively.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 136
·期 20
·47539
·
IF 2.188
Ruiyang Chen,Shibin Wang,Xin Shen,Feng Zhao,Jianchun Guo
Ca 2+ tolerance of water-soluble polyacrylamide is a key problem in application fields. It is urgent to make the mechanism of between the polyacrylamide and Ca 2+ clear. A terpolymer polyacrylamides including the sulfonate group with different monomer concentrations is synthesized. The effect of the CaCl 2 concentration on the rheological properties is measured by a rheological rheometer. The zeta potential of the copolymer solution is obtained by a zeta potentiometer to learn about the electrical characteristics of the copolymers in solution. The microcosmic shape of the copolymer aqueous solution is investigated by a laser particle analyzer and an environmental scanning electron microscope. The results show that more sulfonate groups on the molecule can enhance the salt tolerance of the polyacrylamide. Sulfonate groups can weaken the effect of Ca 2+ on the copolymer through the formation of complexes, whereas the self-aggregation process of the copolymer cannot be stopped at high Ca 2+ concentrations. This study provides theoretical guidance to elucidate the influencing rules and mechanism of calcium salt on the polyacrylamide containing a sulfonate group, which can be helpful for polyacrylamide modification and can improve the application of polyacrylamide under the condition of higher salt concentration. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47539.
研究领域:
化学工程
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材料科学
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石油工程
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产品关联
DOI
高影响因子
ACS Applied Bio Materials
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2022
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IF 0
Mei Zhou,Boying Li,Ning Li,Mengying Li,Chengfen Xing
Ca2+ overload is caused by the abnormal accumulation of Ca2+, which is a potential therapeutic strategy for inhibiting tumor growth. However, due to the limited intracellular Ca2+ concentration, its anticancer effect is non-significant. Herein, near-infrared (NIR)-responsive nanoparticles NPs-PCa (DPPC-DSPE-PEG2000-NH2@PDPP@CaO2@DOX) were designed and prepared to achieve photothermal trigger of Ca2+ release, thereby increasing intracellular Ca2+ content. Furthermore, the nanoparticles convert light to heat to activate the transient receptor potential cation channel subfamily V member 1 (TRPV1) ion channels, allowing external Ca2+ to flow into the cells, further increasing the Ca2+ concentration. NPs-PCa nanoparticles overcome the limitation of insufficient concentration by increasing Ca2+ in both internal and external approaches. Meanwhile, an imbalance of intracellular Ca2+ induces mitochondrial dysfunction and ultimately results in cancer cell death. This study provides an effective strategy for inhibiting breast cancer tumor growth by regulating Ca2+ concentration.
研究领域:
癌症研究
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纳米技术
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治疗学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
SYNTHETIC METALS
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2020
·
IF 3.286
Yiwen Huang,Weilin Zhou,Ye Wang,Yiming Zhang
Due to the weak coordination of alkaline−earth metal ions (such as Mg 2+ , Ca 2+ and Sr 2+ ), the design for corresponding fluorescent probes in vitro is much harder than those for heavy metal ions (such as Cu 2+ , Hg 2+ and Pb 2+ ). In this paper, the crown ether-like structure was introduced in graphene quantum dots (C-GQDs) via the hydrothermal treatment of alizarin . With the strong coordination of crown ether-like structure in C-GQDs’ lattice, C-GQDs show much lower detection limit to Ca 2+ (2 pM) than that of surface modified graphene quantum dots (100 pM). Moreover, the selectivity of C-GQDs can be controlled by the size modulation of crown ether-like structure. Precursors with different structures were carried out to modulate the size of crown ether-like structure in C-GQDs. The obtained C-GQDs show good selectivity for Mg 2+ , Sr 2+ , and Ba 2+ , respectively. Finally, we also show the successful detection of Ca 2+ in vitro based on C-GQDs.
研究领域:
材料科学
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纳米技术
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分析化学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2021
·
IF 9.147
Feilin Lin,Xinyu Zhao,Shujuan Yang,Furui He,Wenqi Qin,Houkui Gong,Gaobo Yu,Yuhong Feng,Jiacheng Li
Pickering emulsions stabilized by soft particles have attracted increasing interest in research areas including food , pharmaceutics, and drug delivery. The interface-film properties have a great influence on the stability of Pickering emulsion. However, in situ studies of the stability of Pickering emulsions by direct visualization technology have not been well explored. In this work, a kind of amphiphilic alginate-based fluorescent polymer was synthesized (named Alg-TPVA) by Ugi reaction. The Alg-TPVA which can self-assemble into micellar aggregates in aqueous solution and was used to stabilize Pickering emulsion. The addition of Ca 2+ triggered the gelation of Alg-TPVA aggregates and changed the properties of the oil-water interface. The size and morphology of the Pickering emulsion were studied in detail by optical scattering and microscopy analyses. The viscoelasticity of the interface-film was characterized by rheological test. The interface-film was further characterized in situ by confocal laser scanning microscope. The spatial network structure of the interface was observed by scanning electron microscope. Results showed that the Alg-TPVA aggregates can adsorb on the oil-water interface to form an interface-film that stabilizes the emulsion. When Ca 2+ is 0.04 M, the interfacial viscoelasticity increases to the maximum, and the thickest interface-film formed rendered the best stability of Pickering emulsion. Moreover, the fluorescence-visualization technology can play a significant role in understanding emulsion stability.
研究领域:
食品科学
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药物递送
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Qianqian Tang,Hao Wu,Mingsong Zhou,Dongjie Yang
Presently, most studies on modified lignin focused on the adsorption to heavy metal cations, but rarely to Ca 2+ in hard water . Therefore, this work prepared a new gel-type lignin-based cationic adsorption resin (E-LSAF) through the crosslinking and curing of alkali lignin grafted by sodium sulfite sulfonated acetone to remove Ca 2+ in water. Under the determined optimum synthesis conditions, E-LSAF with a highest sulfonic group content of 1.99 mmol/g was obtained. Structural and physicochemical measuring results showed E-LSAF was a gel-type resin, owning strong hydrophilicity , high mechanical strength, excellent thermal stability and acid-alkaline resistance. Adsorption results indicated the adsorption of E-LSAF to Ca 2+ was well-fitted by Langmuir model, and the maximum adsorption capacity reached 45.8 mg/g. Pseudo-second-order model can describe this adsorption process well, suggesting it a chemisorption process. Dynamic column adsorption results showed E-LSAF could transform hard water into soft or even very soft water. The regeneration efficiency still maintained 80 % after 5 cycles. The adsorption mechanism was attributed to electrostatic attraction, ion exchange and complexation. This work provided a high-performance lignin-based cationic adsorption material with high adsorption capacity to Ca 2+ and excellent acid-alkaline resistance, which filled the research gap of using modified sulfonated lignin to remove Ca 2+ from water.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biosensors-Basel
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2022
·Vol. 12
·期 5
·331
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IF 5.743
Zhixue Yu,Hui Wang,Yiguang Zhao,Fan Zhang,Xiangfang Tang,Benhai Xiong
An electrochemical biosensor for detecting Ca2+concentration was proposed using glass carbon electrodes (GCEs) modified with nitrogen-doped graphene (NGR), gold nanoparticles (AuNPs) and DNAzyme. The resistance signal was amplified through two methods: electrochemical reduction of AuNPs on the NGR surface to increase the specific surface area of the electrode and strengthen the adsorption of DNAzyme; and increasement of the DNAzyme base sequence. The process of electrode modification was characterized by scanning electron microscopy, Raman spectroscopy, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Experimental parameters’ influence, such as the deposition time of gold nanoparticles and the detection time, were assessed by electrochemical methods. The linear ranges of the electrochemical biosensor were in the range from 5 × 10−6to 5 × 10−5and 5 × 10−5to 4 × 10−4M, with a detection limit of 3.8 × 10−6M. The concentration of Ca2+in the serum of dairy cows was determined by the biosensor with satisfactory results, which could be potentially used to diagnose subclinical hypocalcemia.Keywords:electrochemical biosensor;nitrogen-doped graphene;gold nanoparticles;DNAzyme;dairy cow;hypocalcemia
研究领域:
生物化学
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分析化学
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兽医学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Dali Zhuo,Xiaoyu Dong,Linghuan Li,Ronghua Zeng,Chao Tan,Hong Luo,Zhirong Zou
Calcium ion (Ca 2+ ) is one of the important nutrients for humans, excessive and insufficient intake may both cause diseases, so that it is of great importance to analysis of Ca 2+ in our daily life. In this work, a portable gas pressure meter-based method was developed for the detection of Ca 2+ in water samples and calcium gluconate oral liquids. Ca 2+ in solution was extracted and precipitated by the addition of Na 2 C 2 O 4 , CaC 2 O 4 precipitate was formed and then filtered from the complicated matrix through a filter membrane. The filter membrane (containing CaC 2 O 4 precipitate) was then treated by H 2 SO 4 solution, CaC 2 O 4 precipitate was dissolved during this step and H 2 C 2 O 4 was formed. In a sealed bottle-in-bottle reaction device, H 2 C 2 O 4 reacted with acidic KMnO 4 solution to generate CO 2 gas, causing a significant gas pressure increase and it was readout by a hand-held pressure meter. A standard curve with linear range of 1–80 mmol L −1 and a limit of detection of 0.4 mmol L −1 were obtained. This system was subsequently applied to the detection of Ca 2+ in several water samples and oral liquids, recoveries of 92–110 % were obtained for their spiked samples. Only a few reaction bottles and a gas pressure meter were required in this system. It is a low-cost, sensitive, rapid and easy-used analytical method for on-site determination of Ca 2+ .
研究领域:
分析化学
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营养学
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2024
·
IF 4.3
Yun Wang,Zhiyuan Pan,Sihan Feng,Lijie Gao,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Near-infrared (NIR)-emitting phosphors with high quantum efficiency and thermal stability are crucial to NIR pc-LEDs. Garnet-structured (GdLuCa)(Al4–zSiCrz)O12 (z = 0.01–0.2) and (Gd2–xLuCax)(Al4.95–xSixCr0.05)O12 (x = 0.2–1.0) new phosphors with promising NIR luminescence under blue light excitation were designed and fabricated by a solid-state reaction in this work. It was analyzed that the Ca2+, Cr3+, and Si4+ ions would replace Gd3+ in [GdO8], Al1 in [Al1O6], and Al2 in [Al2O4], respectively, and the optimal Cr3+ content is z = 0.05, above which concentration quenching would occur via an electric dipole–dipole interaction. Increasing Ca2+/Si4+ substitution up to x = 1.0 led to luminescence enhancement by a factor of up to 1.85 and internal/external quantum efficiency (%) increment from ∼25.9/10.7 to 63.4/27.5, and all of the phosphors showed excellent thermal stability (I423 K/I298 K ≥ 87.6%). The luminescence properties of Cr3+ were discussed in detail through systematic investigation of the effects of Cr3+ and Ca2+/Si4+ contents on the crystal structure, local coordination, and crystal field. With the NIR pc-LED device integrated from the optimal phosphor (x = 1.0) and a blue LED chip, electroluminescence manifested potential applications in night vision and medical diagnosis.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 33
·19415-19422
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IF 10.733
Panpan Su,Shuangshuang Ma,Wenjuan Huang,Yash Boyjoo,Shiyang Bai,Jian Liu
The development of highly efficient oxygen evolution reaction (OER) electrocatalysts is critical because the sluggish reaction kinetics of this reaction usually hinders the efficiency of water electrolysis for the generation of H2. Herein, we report that ultrathin cobalt-based coordination polymers (Co-CPs) plates are exceptional electrocatalysts for the OER as they show one of the most lowest Tafel slopes among the cobalt-based OER catalysts reported to date. It has been found that the Co-CPs can be transformed into Co(OH)2 hexagonal nanoplates and then further oxidized into CoOOH, which acts as a catalytic active site for the oxidation of water. Interestingly, when Ca2+, an inactive ion, was introduced into the precursors, thinner CoOOH nanosheets with more exposed active sites were formed, which displayed significantly higher OER activity than the Co-CPs. Furthermore, the content of Ca2+ in the Co-based coordination polymers (CoxCay-CPs) and the corresponding OER activity of these CPs were systematically investigated, and Co0.89Ca0.11-CPs exhibited highest OER activity. This study provides a fundamental understanding of the catalytic mechanism of cobalt-based coordination polymer electrocatalysts and the effect of inactive species, such as Ca2+, on the OER in an alkaline electrolyte, which may promote the design of highly active electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xuefei Zhang,Fanfei Min,Lingyun Liu
Ca 2+ is an important cation in coagulants used in the treatment of mine wastewater such as coal slime water, and its concentration directly affects the settling and flotation of coal slime water. The rapid determination of Ca 2+ concentration is of great significance to guiding industrial production. Herein, the complexation color development—visible spectrophotometry (CCDVS) method was proposed to obtain the concentration information of Ca 2+ , wherein 1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid (Calmagite) was used as an indicator and the mechanism of complexation between the indicator and Ca 2+ was explored. The strong correlation between spectral data and Ca 2+ concentration (R 2 = 0.997) indicated that this method could be used for Ca 2+ detection, thereby a quantitative model was proposed to predict Ca 2+ concentration by using the complexation color development—visible light absorption data. The chemical element and bonding analysis confirmed that Ca 2+ was complexed with the sulfonic acid group on the indicator skeleton in the form of Ca(OH) + intermediate in an alkaline environment. The generated complexation product (-S-O-Ca(OH) + ) could stably absorb 620 nm light energy, and its absorption performance remained 99.8% after standing for 60 min. The relative standard deviation of the detection results of Ca 2+ in different calcium source solutions was as low as 1.24%, which confirmed the strong calcium source compatibility of the proposed method. More importantly, the successful application of this method in the determination of Ca 2+ concentration at different points in industrial coal slime water system proved its advantages of high accuracy (relative error is as low as 5.01%), low cost and simple operation. The LOD of this method is 0.038 mg/L. Therefore, the complexation color development—visible spectrophotometry method can maximize the potential for cost reduction and efficiency improvement in mine wastewater treatment.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Yinghao Xue,Ping Xiang,Yuzhu Jiang,Huilan Lian,Jingyu Mo,Mengying Li
Excessive phosphate in surface water can spur the growth of organism, which put a threat on the bio-safety of drinking water. Different from previous study, sodium acetate (NaAc) was used as modification agent of Fe 3 O 4 , then the magnetic Fe 3 O 4 @ZIF-67 composites with a non-core-shell sturture were synthesized. According to ZIF-67 loading and phosphate adsorption of synthesized Fe 3 O 4 @ZIF-67, the Fe 3 O 4 @ZIF-67 composites with a Co 2+ /Fe 3 O 4 molar ratio of 1:2 was taken into further evaluation. Fe 3 O 4 @ZIF-67 composites exhibited satisfactory adsorption performance and easy magnetic recovery, and the sorption capacity reached 116.59 mg P/g within 180 min (C 0 = 20 mg P/L, 298 K). The maximum adsorption capacity of phosphate was obtained at the neutral pH, and not significantly interfered with ions of K + , Mg 2+ , NO 3 − and SO 4 2- . Remarkably, Fe 3 O 4 @ZIF-67 described enhanced phosphate adsorption ability in the presence of Ca 2+ . To investigate the role of Ca 2+ , two modes (preloading and addition) of Ca 2+ dosing were examined and the improved adsorptive performance could be owing to the synergistic eff ;ect of adsorption and Ca-P micro-precipitation on the surface of Fe 3 O 4 @ZIF-67. During the regeneration process, the performance of desorbent was evaluated by phosphate releasing and secondary adsorption, and the absence or presence of Ca 2+ would have a significant impact on the selection of desorption solution.
研究领域:
环境科学
·
材料科学
✓ 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）