BIOMACROMOLECULES
·
2025
·
IF 5.4
Wen-Zhu Wang,Sai Li,Xue-Ying Li,Song-Po Yao,Jing Wu,Rui-Min Han,Geng Dong,Jian-Ping Zhang
The aggregation of intrinsically disordered proteins (IDPs) is of significant interest due to its role in proteopathies and nutritional and pharmaceutical potential. This study investigates the mechanism of Ca(II)-induced aggregation of an IDP β-casein (β-CN) using dynamic light scattering, cryo-transmission electron microscopy, and molecular dynamics simulations. Upon Ca(II) addition, β-CN undergoes successive induction, growth, and saturation phases, forming amorphous aggregates. Aggregation kinetics are highly dependent on the Ca(II) concentration. At a molar ratio exceeding 5:1, the hydrodynamic diameter of β-CN increased from 20 nm (oligomer) to >100 nm (aggregate product) in a minute. The induction phase is driven by neutralizing the phosphorylated groups via Ca(II) binding, while subsequent growth and saturation phases are governed by agglomeration of intermediate aggregates with nuclei-exposed oligomers, eventually forming aggregate products after conformational relaxation. We demonstrate that the porosity and tunable assembly of β-CN aggregates enable efficient encapsulation of bioactive molecules, offering promising applications in nanonutrition and nanotheranostics.
研究领域:
生物物理化学
·
分子生物学
·
纳米营养学
·
药物递送
·
蛋白质聚集
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 30
·75681-75693
·
IF 5.8
Kang Fei,Lv Qilin,Fan Jingbiao,Zhang Yun,Song Yuling,Ren Xueqin,Hu Shuwen
Soil acidification is a worldwide eco-environmental problem detrimental to plant growth and threatening food security. In this study, calcium poly(aspartic acid) (PASP-Ca) and calcium poly-γ-glutamic acid (γ-PGA-Ca) were obtained through cation exchange and used to mitigate soil acidity owing to high solubility and complexing capability. Three rates at 6.7, 13.4, and 20.1 g kg −1 , denoted as PASP-Ca1, PASP-Ca2, and PASP-Ca3, and γ-PGA-Ca (7.4 g kg −1 ) were surface-applied and compared with conventional lime (CaCO 3 , 2.5 g kg −1 ) along with control in two soil layers (top soil 0–10 cm, subsoil 10–20 cm). After leaching, various soil properties and aluminum fractions were measured to assess their ameliorative performance and mechanisms. Although lime achieved the highest soil pH (6.91) in the topsoil followed by PASP-Ca and γ-PGA-Ca (pH: 5.57–6.33), it had less effect on subsoil increase (5.3) vs. PASP-Ca and γ-PGA-Ca (pH: 5.44–5.74). Surface-applied PASP-Ca demonstrated efficiency in elevating soil pH and reducing exchangeable acidity, mainly as exchangeable Al 3+ , whereas γ-PGA-Ca addition superiorly improved soil pH buffering capacity (pHBC). Moreover, PASP-Ca and γ-PGA-Ca addition improved organic carbon by 34.4–44.9%, available P by 4.80–20.71%, and cation exchange capacity (CEC) by 6.19–29.2%, thus greatly enhanced soil fertility. Ca 2+ from polyAA-Ca promoted the displacement of exchangeable Al 3+ or H + from soil colloid, which were subsequently complexed or protonated and facilitated leaching. Additionally, the transformation into stable organo-aluminum fractions via complexation inhibited further hydrolysis. Under PASP-Ca or γ-PGA-Ca addition, the saturation of aluminum in cation exchange complex was reduced 2.91–7.81% compared to the control without addition amendments. Thus, PASP-Ca and γ-PGA-Ca can serve as potent ameliorants to alleviate soil acidity and aluminum toxicity for sustainable agricultural development.
研究领域:
农业科学
·
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
npj Materials Degradation
·
2024
·Vol. 8
·期 1
·1-11
·
IF 6.6
Liu Tong,Chen Zhuoyao,Yang Jingzhi,Ma Lingwei,Mol Arjan,Zhang Dawei
Machine learning is a powerful means for the rapid development of high-performance functional materials. In this study, we presented a machine learning workflow for predicting the corrosion resistance of a self-healing epoxy coating containing ZIF-8@Ca microfillers. The orthogonal Latin square method was used to investigate the effects of the molecular weight of the polyetheramine curing agent, molar ratio of polyetheramine to epoxy, molar content of the hydrogen bond unit (UPy-D400), and mass content of the solid microfillers (ZIF-8@Ca microfillers) on the low impedance modulus (lg| Z | 0.01Hz ) values of the scratched coatings, generating 32 initial datasets. The machine learning workflow was divided into two stages: In stage I, five models were compared and the random forest (RF) model was selected for the active learning. After 5 cycles of active learning, the RF model achieved good prediction accuracy: coefficient of determination ( R 2 ) = 0.709, mean absolute percentage error (MAPE) = 0.081, root mean square error (RMSE) = 0.685 (lg(Ω·cm 2 )). In stage II, the best coating formulation was identified by Bayesian optimization. Finally, the electrochemical impedance spectroscopy (EIS) results showed that compared with the intact coating ((4.63 ± 2.08) × 10 11 Ω·cm 2 ), the | Z | 0.01Hz value of the repaired coating was as high as (4.40 ± 2.04) × 10 11 Ω·cm 2 . Besides, the repaired coating showed minimal corrosion and 3.3% of adhesion loss after 60 days of neutral salt spray testing.
研究领域:
材料科学
·
电化学
·
人工智能
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yongqiang Zhang,Zhiwei Zhou,Bingchu Mei
The high optical quality Nd 3+ doped asymmetrical (Ca x Sr 1-x ) 5 (PO 4 ) 3 F transparent ceramics were successfully fabricated using the hot-pressing method. The phase composition, in-line optical transmittance, microstructure and fluorescence properties were discussed. The findings revealed that the Ca 2+ and Sr 2+ were dissolved in Sr 5 (PO 4 ) 3 F crystal cell instead of forming a new heterophase structure. The prepared ceramics exhibited an in-line transmittance of 75 % at 1μm and 55 % at 600 nm, demonstrating high transparency rather than translucency. The emission intensity and FWHM of neodymium doped ceramic samples can be significantly enhanced through co-doping with Ca 2+ and Sr 2+ . Furthermore, by adjusting the Ca/Sr ratio, these samples can achieve controllable emission light within the wavelength range between neodymium doped FAP and S-FAP emissions. The fluorescence lifetime was obviously improved compared with Nd: FAP and slightly reduced compared with Nd: S-FAP. Moreover, the fluorescence lifetime trend varies in accordance with the alteration of lattice constant.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2026
·
IF 3.3
Xu Guo,Yuge Yao,Xin Sun,Xin Ye,Lei Jin,Lei Wang,Yamei Zhang,Songtao Dong
The lanthanide La 1-x Ca x CoO 3 perovskite nanofibers are synthesized via a two-step electrospinning process followed by calcination. Detailed analysis is carried out on microstructure, morphology, elemental composition and chemical bonding state of La 1-x Ca x CoO 3 perovskite. The La 1-x Ca x CoO 3 nanomaterials exhibit a hollow nanotube structure. Notably, La 0.85 Ca 0.15 CoO 3 exhibits the smallest nanotube diameter (100 nm) and the largest specific surface area (47.52 m 2 ·g −1 ), as well as the highest specific capacitance (316 F/g). After 6000 cycles, the specific capacitance of the La 0.85 Ca 0.15 CoO 3 electrode demonstrated a 200% gradual increase, with efficiency remaining above 95%. To evaluate the practical viability of the material, a coin cell was assembled using the optimized La 0.85 Ca 0.15 FeO 3 electrode, and its energy and power densities were compared with the results from the three-electrode system. At 1000 W kg −1 , the high energy densities of the three-electrode and coin cell device systems attain values of 60.8 and 45.0 Wh kg −1 , respectively. This proposed synthesis strategy has the potential to yield significant advancements for high-performance supercapacitor electrode materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 12
·122505
·
IF 3.9
Yongxin Wu,Muya Cai,Hongya Wang,Zuojun Hu,Fangzhao Pang,Xiang Chen,Meiyu Zhao,Bingbing Wang,Xiong Zhang,Xiaowei Liu,Dihua Wang,Huayi Yin
Lead-acid batteries (LABs) are commonly utilized in various applications such as electric motorcycles, uninterruptible power systems, and stationary energy storage devices. Calcium (Ca) is an essential element being added to Pb grid alloys to increase their mechanical strength. In this paper, molten salt electrolysis is used to prepare Pb-Ca master alloy in molten CaCl2-NaCl at 700 °C. The Ca concentration reaches 2.51 wt%, and the current efficiency reaches 85.0% for the 1 A-scale electrolyzer and 75.8% for the 50 A-scale cell. Compared with the traditional physical mixing ways, Ca is selectively and gradually deposited in the liquid Pb cathode without worrying about the immense heat generated by mixing Ca and Pb. In addition, molten salt serves as a media to avoid the oxidation of Ca. Through thermodynamic calculations and electrochemical measurements, the Pb-Ca formation prefers to happen rather than Pb-Na alloy in molten CaCl2-NaCl because of the stronger interaction of Ca and Pb than Na and Pb. Overall, this paper provides a straightforward strategy to prepare Pb-Ca master alloys, which can be expanded to prepare various liquid semimetal alloys containing reactive metals.
研究领域:
材料科学
·
冶金工程
·
电化学
·
能源材料
·
功能合金
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2015
·
IF 1.933
Huixian Lai,Liuqing Huang,Chenghao Lu,Ming Fang,Wenhui Ma,Pengfei Xing,Jintang Li,Xuetao Luo
To explore the potential of acid leaching in purifying metallurgical grade silicon (MG-Si) for solar cell applications, the effect of silicon microstructure on its leaching behavior was systematically investigated in the present work by a combination of alloying refining with acid etching. The microstructure evolution of silicon was revealed before and after acid etching with different lixiviants. Calcium-containing precipitates were found in MG-Si after alloying with calcium. The etching results showed that the leaching behavior of impurity inclusions strongly depended on the composition of the major impurities. HCl + HF mixture was an effective lixiviant for dissolving impurity inclusions in both MG-Si and its alloy with calcium. The impurity removal efficiency of acid leaching of MG-Si was efficiently improved after alloying. Moreover, the kinetics of acid leaching of MG-Si after alloying with calcium was further discussed based on cracking shrinking model.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21267-21278
·
IF 0
Zhao Dongling,Geng Linlin,Jia Yanfei,Wei Jianwen,Zhou Xiaobin,Liao Lei
High-temperature solid adsorbent Li 4 SiO 4 has received broad attention due to its high theoretical adsorption capacity, high regeneration capacity, and wide range of raw materials for preparation. In this paper, a Li 4 SiO 4 adsorbent was prepared by MCM-48 as the silica precursor and modified by doping with metal ions (Ca 2+ and Na + ) for high-temperature capture of low-concentration CO 2 . The results showed that the surface of the Ca-doped (or Na-doped) Li 4 SiO 4 adsorbent developed some particles that are primarily composed by Li 2 CaSiO 4 (or Li 3 NaSiO 4 ). Furthermore, the grains of the adsorbents became finer, effectively increasing the specific surface area and enhancing adsorption performance. Under 15 vol% CO 2 , the maximum CO 2 adsorption was 25.63 wt% and 32.86 wt% when the Ca 2+ doping amount was 0.06 and the Na + doping amount was 0.12, respectively. These values were both higher than the adsorption capacity before the metal ion doping. After 10 adsorption/desorption cycles, the adsorption capacity of Na-doped Li 4 SiO 4 increased by 9.68 wt%, while that of Ca-doped Li 4 SiO 4 decreased by 7.98 wt%. This difference could be attributed to the easy sintering of the Ca-containing adsorbent. Furthermore, a biexponential model was used to fit the CO 2 adsorption curve of the adsorbent in order to study the adsorption kinetics. Compared to the conventional Li 4 SiO 4 , the Ca/Na-doped adsorbent offers several advantages, such as a high CO 2 adsorption capacity and stable cycling ability.
研究领域:
材料科学
·
环境工程
·
化学工程
·
吸附技术
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Juntao Huang,Saifei Wang,Zhifei Zhang,Mingli Chen,Han Wang,Haihua Huang,Qian Wang,Jigong Hao,Wei Li,Juan Du,Mahesh Kumar Joshi,Peng Fu
Ceramic dielectric capacitors have gained significant attention due to their ultrahigh power density, current density, and ultrafast charge–discharge speed. However, their potential applications have been limited by their relatively low energy storage density. Researchers have employed various approaches to enhance their energy storage density. In this study, (1 – x)(Bi0.5Na0.5)0.7Sr0.3TiO3–xCa(Mg1/3Ta2/3)O3 ceramics were prepared via a solid-phase reaction, and the effect of their structure on the energy storage properties was investigated. The results indicate that the introduction of Ca(Mg1/3Ta2/3)O3 significantly alters the multiscale structures of the (Bi0.5Na0.5)0.7Sr0.3TiO3 ceramic, including the transformation from the T-phase to the C-phase, refinement of ceramic grains, and the formation of polar nanoregions (PNRs), accompanied by an increase in the bandgap and relaxation degree. These structural changes collectively contributed to the improved overall energy storage properties of the modified ceramics. Notably, the 0.92(Bi0.5Na0.5)0.7Sr0.3TiO3–0.08Ca(Mg1/3Ta2/3)O3 ceramic demonstrated a recoverable energy storage density (Wrec) of 8.37 J/cm3 with an energy storage efficiency (η) of 87.7% at an electric field of 530 kV/cm. It also exhibited good temperature stability (25–120 °C), frequency stability (1–100 Hz), and fatigue stability (1–105). Furthermore, it displayed exceptional charge and discharge properties, with the discharge energy density (WD), discharge time (t0.9), current density (CD), and power density (PD) attaining 4.06 J/cm3, 35.2 ns, 2143.28 A/cm2, and 460.71 MW/cm3, respectively. These findings suggest that modified (1 – x)(Bi0.5Na0.5)0.7Sr0.3TiO3–xCa(Mg1/3Ta2/3)O3 ceramics are promising candidates for high-power pulsed electronic systems.
研究领域:
材料科学
·
无机非金属材料
·
电介质物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Jing Zhou,Yingde Xu,Yifan Wang,Shengli Zhu,Zhenduo Cui,Yanqin Liang,Hui Jiang,Xiang Ge,Zhaoyang Li
Calcium sulfate (CS) is a commonly used filling material for bone defects; however, its mechanical strength requires further enhancement. The hydration process of CS significantly influences its mechanical properties. This study aims to improve these properties by incorporating carboxymethyl cellulose (CMC) and silicon dioxide (SiO 2 ) to optimize the hydration process of calcium sulfate hemihydrate (CSH). After adding CMC, the content of CSH in the hydrated material significantly increased, while the amount of calcium sulfate dihydrate (CSD) decreased. In the XPS analysis, the Ca 2p peaks exhibited notable shifts following the addition of CMC and SiO 2 . The mechanisms by which the hydration process influences mechanical strength were further analyzed. It was found that Ca 2+ ions from CSH chelated with CMC, while SiO 2 formed Si-O-Ca bonds with Ca 2+ , both affecting the hydration process of CSH in different ways. The optimal addition amounts of CMC and SiO 2 were both determined to be 1.5 %. Compared to pure CS, the mechanical properties of the experimental group increased by 520 %, rising from 4.28 MPa to 22.25 MPa. Additionally, the injectivity and erosion resistance were improved. All materials showed no cytotoxicity in hemolysis and cell experiments. In summary, this study demonstrates how the mechanical strength of CS can be enhanced by incorporating CMC and SiO 2 to influence its hydration process.
研究领域:
材料科学
·
生物材料
·
骨科
·
生物医学工程
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Ning Mao,Chun Hui Zhou,John Keeling,Saverio Fiore,Hao Zhang,Liang Chen,Gui Chen Jin,Ting Ting Zhu,Dong Shen Tong,Wei Hua Yu
Dolomite is a widespread carbonate mineral that has been investigated extensively over the past two centuries. Despite the high level of investigation, aspects of the environmental conditions of crystallization, diagenesis and dissolution remain elusive and the transformation of dolomite into other value-added products is still challenging. This work shows a novel, cleaner method to dissolve dolomite by taking advantage of the acidity from the hydrolysis of Lewis acid AlCl 3 and as such the mineral can be efficiently converted into Ca-Mg-Al layered double hydroxide (LDH). The dolomite and the resulting Ca-Mg-Al LDH samples were characterized by powder X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composition of the products was measured by energy dispersive spectrometer-mapping (EDS-mapping), X-ray fluorescence (XRF) and atomic absorption spectroscopy (AAS). Particle sizes of the products were measured by a dynamic light scattering method. It is documented, for the first time, that dissolution of dolomite in AlCl 3 aqueous solution is facilitated by hydrothermal treatment . Well-crystallized Ca-Mg-Al LDH crystals are achieved under (Ca + Mg): Al molar ratio = 1:1, pH = 10.5 via a simple co-precipitation method. The maximum utilization efficiencies of Ca 2+ , Mg 2+ from dolomite to LDH are 36.3% and 95.5%, respectively. The possible mechanisms of LDH formation were: 1) the dolomite dissolved in the strong acid solution due to the hydrolysis of AlCl 3 and thus provided Ca 2+ and Mg 2+ ; 2) with addition of NaOH, Al 3+ cations precipitated to form Al(OH) 3 (at 8.3 ≤ pH ≤ 9.3) and then part of the Al(OH) 3 reacted with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH; 3) at pH = 10.5, the Al(OH) 3 was transformed as [AlO(OH)] and meanwhile Ca 2+ , Mg 2+ and Al 3+ took part in the formation of Ca-Mg-Al LDH; 4) when pH = 10.6, [AlO(OH)] reacted with NaOH to dissolve into [Al(OH) 4 ]− and the [Al(OH) 4 ]− finally co-precipitated with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH during heating for drying.
研究领域:
材料科学
·
矿物加工
·
无机化学
·
环境地球化学
·
湿法冶金
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Mingfeng Ma,Leipeng Li,Chongyang Cai,Yixiao Han,Yanmin Yang
Due to the unique outer electronic configuration, Mn 2+ can emit tunable luminescence over a wide wavelength range, which thus has a broad spectrum of applications in many fields such as lighting and anti-counterfeiting. Although the persistent luminescence of Mn 2+ in oxyacid salts has been widely studied, it is, however, rarely mentioned in fluorides, due to the fluorides’ wide band gap which cannot be effectively excited by ultraviolet light. Here, we mainly study the persistent luminescence of MgF 2 :Mn 2+ upon excitation of X-ray source. In addition, we also investigate the influence of Ca 2+ on the persistent luminescence of MgF 2 :Mn 2+ , and successfully achieve luminescence modulation from orange toward green in the CIE chromaticity coordinates. Finally, we show the potential applications of the persistent luminescence of (Mg,Ca)F 2 :Mn 2+ in terms of dynamic security.
研究领域:
材料科学
·
发光材料
·
光学性质
·
防伪技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）