INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 19
·11853
·
IF 6.208
Zichao Wang,Pei Liu,Ziyi Fang,He Jiang
Immobilized enzymes are a significant technological approach to retain enzyme activity and reduce enzyme catalytic cost. In this work, trypsin-incorporated Zn3(PO4)2hybrid nanoflowers were prepared via mild precipitation and coordination reactions. The controllable preparation of hybrid nanoflowers was achieved by systematically investigating the effects of the raw-material ratio, material concentration and reaction temperature on product morphology and physicochemical properties. The enzyme content of hybrid nanoflowers was about 6.5%, and the maximum specific surface area reached 68.35 m2/g. The hybrid nanoflowers exhibit excellent catalytic activity and environmental tolerance compared to free trypsin, which was attributed to the orderly accumulation of nanosheets and proper anchoring formation. Further, the enzyme activity retention rate was still higher than 80% after 12 repeated uses. Therefore, trypsin/Zn3(PO4)2hybrid nanoflowers—which combine functionalities of excellent heat resistance, storage stability and reusability—exhibit potential industrial application prospects.Keywords:hybrid materials;trypsin;nanoflowers;controlled synthesis;catalytic performance
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 17
·3541
·
IF 5
Kai Chen,Encheng Liu,Shengrong Yuan,Baoquan Zhang
Designing anisotropic lignin-based particles and promoting the high-value utilization of lignin have nowadays drawn much attention from scientists. However, systematic studies addressing the self-assembly mechanisms of anisotropic lignin-based particles are scarce. In this work, an interaction including the electrostatic forces and chelating forces between lignin and Ag+was regulated via carboxymethylation modification. Subsequently, the aggregation morphology of carboxymethylated lignin in a Ag+solution was observed via SEM. The result showed that a large number of Ag+intercalated into the lignin molecules when the grafting degree of the carboxyl groups increased from 0.17 mmol/g to 0.53 mmol/g, which caused the lignin molecules to gradually transform from disordered blocks to ordered layers. Dynamics research indicated that the adsorption process of Ag+in carboxymethylated lignin conforms to the Pseudo-first-order kinetic model. The saturated adsorption amount of Ag+in the carboxymethylated lignin reached 1981.7 mg/g when the grafting rate of carboxyl groups increased to 0.53 mmol/g, which then fully intercalated into lignin molecules and formed a layered structure. The thermodynamic parameters showed that the thermal adsorption process conforms to the Langmuir model, which indicates that Ag+is monolayer-adsorbed and intercalated into lignin molecules. Meanwhile, the ΔH values are more than 0, which suggests that this adsorption process is a endothermic reaction and that a higher temperature is conducive to an adsorption reaction. Therefore, self-assembly of lignin in a Ag+solution under 70 °C is more conducive to the formation of a nanoflower structure, which is consistent with our experimental result. Finally, pH-responsive Pickering emulsions were successfully prepared using a lignin-based nanoflowers, which demonstrated their potential as a catalytic platform in the interface catalysis field. This work offers a deeper understanding into the formation mechanism of anisotropic lignin-based nanoflowers and hopes to be helpful for designing and preparing anisotropic lignin-based particles.Keywords:lignin;chemical modification;self-assembly mechanisms;nanoflowers;emulsifying activity
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2014
·Vol. 7
·期 4
·1300-1306
·
IF 1.938
Yuhao Xiong,Siheng Chen,Fanggui Ye,Linjing Su,Cong Zhang,Shufen Shen,Shulin Zhao
In this paper, magnetic core–shell nanoflowers Fe3O4@MnO2 were fabricated via a solvothermal method. We demonstrated that the as-synthesized magnetic nanoflowers Fe3O4@MnO2 possess intrinsic oxidase-like activity in a wide pH range and can catalytically oxidize 4-aminoantipyrine (4-AAP) and phenol substrates to form pink color products without the requirement for additional oxidizing agents. On the basis of this phenomenon, a simple colorimetric method for the determination of phenol was developed. A wide linear detection range can be obtained from 1.0 μM to 120 μM (R2 = 0.9962) with a detection limit of 0.15 μM. And the method was applied to determine phenol in wastewater with good recoveries ranging from 96.0 to 101.5%. Furthermore, benefitting from chemical stability and easy recovery (by simple magnetic separation) of Fe3O4@MnO2, the oxidase mimetics have excellent reusability and reproducibility in cycle analysis.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Long Cheng,Linzhi Zuo,Chengping Li,Jiubing Shen,Liang Wang,Yang Li,Dmitrii Dukashin,Petr Senin,Shitan Yan,Ting Bian
Solar-driven interfacial evaporation is a kind of sustainable and eco-friendly method of water treatment to alleviate the global water crisis. Here we demonstrate a novel sandwiched solar interfacial evaporator integrating phase change material (PCM), sodium alginate hydrogel (SA), and NiCo 2 O 4 nanoflower featuring superb evaporation and glorious thermal energy management to achieve efficient energy utilization and long-term evaporation stability. After being combined with filter paper, NiCo 2 O 4 nanoflower composites are adopted as the light absorber on the top layer, which can achieve an absorption of about 96.5 % in the full spectral range. SA hydrogel has been used as an intermediate layer for rapid water supply to the evaporation interface and to prevent salt deposition. Under one sun irradiation (1 kW m −2 ), the evaporator exhibits a high evaporation rate (1.94 kg m -2 h −1 ) and excellent endurance in the treatment of high salt-concentration water. In particular, benefiting from the rational combination of PCM, the water production reached up to 12.13 kg m −2 , which is 2.23 kg m -2 higher than that of the evaporator without PCM under natural solar irradiation for 9 h. This work presents a promising concept for maximally utilizing intermittent solar irradiation energy and prolonged salt-free deposition desalination.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Baoqing Han,Congsi Wang,Wanying Yang,Guoqiang Hu,Xinyu Zhang,Benben Wang,Hairong Wang
As a typical physiological marker, isoprene has been widely studied for its related applications in breath detection. Pure ZnO samples were prepared using the classical hydrothermal method with varying synthesis parameters. By comparing these parameters, the optimal synthesis conditions and nanostructures were determined. The prepared spherical ZnO nano-flower material (ZnO-S5 sample) exhibited a loose and porous structure. Additionally, the gas sensing sensors were prepared with ZnO-S4 and ZnO-S5 samples respectively, and their gas-sensing characteristics were analyzed comprehensively. The data indicated that spherical nano-flower ZnO sensor (ZnO-S5) exhibited an optimal operating temperature of 260 °C, and the response time is only 5 s when the isoprene concentration is 0.2 ppm. It also demonstrated good repeatability and sustained stability. Notably, even at isoprene concentrations as low as 20 ppb, the ZnO-S5 sample still had obvious response, and the response value was approximately 3.3 times that of ZnO-S4. Simultaneously, when compared with other typical biomarkers such as hydrogen, carbon monoxide, ammonia, ethanol and acetone, ZnO-S5 sample has relatively better selectivity for isoprene. Therefore, the spherical nano-flower-like ZnO sensor holds promise as a low-cost, high-performance isoprene gas detector for the rapid identification of trace isoprene.
研究领域:
材料科学
·
生物医学工程
·
气体传感技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Zhibao Wang,Hanqing Gu,Zhanyu Li
Vanadium oxide cathode materials in aqueous aluminum-ion batteries (AAIBs) have an exceptional potential for development because of their high valence and fast electron transfer capability. However, the strong electron–electron Coulomb repulsion in vanadium and its associated electrostatic interactions severely hinder the feasibility of vanadium oxides in AAIBs. The glucose-assisted hydrothermal reduction of monoclinic VO 2 combined with Cu ion doping effectively promotes the self-assembly of VO 2 into nanoflower architectures, enabling precise control over morphology and crystalline structure. When integrated with a 5 m Al(OTF) 3 electrolyte and an Ionic liquid （IL ）-treated Al sheet anode, this full battery demonstrates outstanding electrochemical performance, achieving an initial discharge capacity of 642 mAh·g −1 at 0.4 A·g −1 . Moreover, introducing Cu 3d orbitals effectively enhances the hybridization and electronic coupling effects between the V 3d and O 2p orbitals. Ex situ characterization and diffusion kinetic provide insights into the embedding/de-embedding mechanism of Al 3+ . This work significantly improves the application potential of VO 2 in AAIBs through structural optimization and mechanism studies and provides systematic scientific guidance for the development of vanadium oxide cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenyao Xue,Hongliang Fu,Guanjie Xue,Jing Zhao,Yue Lian,Zhifeng Wang,Yongfeng Hu,Huaihao Zhang
The oxygen evolution reaction (OER), a half-process of water electrolysis, involves four electron transfer processes with a high energy barrier, leading to slow reaction kinetics. Developing stable and high-efficiency OER electrocatalysts remains a major challenge in field of water electrolysis. Here, a novel Ni-doping V 2 O 5 @NC nanoflower-like catalyst is synthesized for OER reaction. Specifically, Ni-V 2 O 5 @NC is obtained by incorporating Ni into V 2 O 5 through a simply hydrothermal- carbonization process, using NH 4 VO 3 , Ni(NO 3 ) 2 ·6 H 2 O and H 2 C 2 O 4 · 2 H 2 O as raw materials. This approach can improve the OER activity and stability of V 2 O 5 . Ni-V 2 O 5 @NC presents the following advantages. Firstly, Ni-doping combined with nanoflower structure improves the reaction activity. Ni-doping generates more electrochemical active sites, facilitating the adsorption/desorption process of reaction intermediates and electron transfer, thereby enhancing catalytic activity. Besides, the nanoflower-like structure provides a relatively high specific surface area and more active sites to participate in the reaction, thus boosting the catalytic reactivity. Secondly, Ni with high conductivity and its doping into V 2 O 5 causes structural and performance changes of material, reducing the charge transfer resistance and optimizing the conductive property. Meanwhile, the inherent N and C from hydrothermal reaction also increase material conductivity. Also, Ni doping inhibits the stacking of V 2 O 5 lamellar structure while maintaining the catalyst’s activity, structural integrity and the improved stability. The electrochemical analysis results show Ni-V 2 O 5 @NC good electrochemical performance. Ni-60-V 2 O 5 @NC features a low overpotential (300 mV@10 mA cm −2 ) and a small Tafel slope (74.2 mV dec −1 ) in OER. Additionally, the overpotential of Ni-60-V 2 O 5 @NC only increases by 3 mV after 1000 cycles stability tests.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Today
·
2021
·
IF 20.722
Long Gao,Haili Yan,Shuang Zhu,Xiaochun Wang,Yan Tan,Jiangfeng Du,Duiping Feng,Hui Zhang,Zhanjun Gu
Microwave ablation (MWA) is acknowledged as one of the optimal therapeutic strategies for unresectable hepatocellular carcinoma (HCC). Unfortunately, inadequate MWA at high-risk sites is very common in clinic owing to the scruple of probable damage to adjacent vital organs, which eventually leads to recurrence of residual tumors. Herein, we synthesize novel Bi 2 Se 3 nanoflowers (NFs) which possess the peculiarity of microwave sensibilization and explore their sensitization capability both in vitro and in vivo . The as-prepared NFs exhibits remarkable heating capacity under microwave irradiation compared to deionized water , mainly due to the multilayered petal structures that could strongly increase the reflectivity of microwave and stimulate the motion of water molecules. More importantly, we recruit clinically available transarterial infusion (TAI) method for precisely targeted delivery of Bi 2 Se 3 NFs to tumor site and perform sequential MWA on orthotopic liver tumor. In addition, the high Z element containing Bi 2 Se 3 NFs could realize efficient computed tomography to monitor the therapeutic process. What’s more, no obvious cell and organic toxicity are observed during the experimental period, which further verifies the good biocompatibility of Bi 2 Se 3 NFs. In this work, we utilize minimally invasive TAI for targeted delivery of microwave sensitive nanoflowers to improve MWA efficacy at tumor site and reduce side effect in normal tissues, which provides a neoteric theoretical and experimental strategy for clinical interventional therapy of HCC.
研究领域:
医学影像学
·
肿瘤学
·
生物材料学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chong Chen,Qiuhao Li,Fengqing Wang,Changjiang Hu,Jun Ma
Precise defect engineering of photocatalysts is highly demanding but remains a challenge. Here, we developed a facile and controllable γ-ray radiation strategy to assemble dual-vacancies confined MoS 2 -CdS-γ nanocomposite photocatalyst. We showed the solvated electron induced homogeneous growth of defects-rich CdS nanoparticles, while the symbiotic • OH radicals etched flower-like 1T/2H MoS 2 substrate surfaces. The optimal MoS 2 -CdS-γ exhibited a H 2 evolution rate of up to 37.80 mmol/h/g under visible light irradiation, which was 36.7 times higher than that of bare CdS-γ, and far superior to those synthesized by hydrothermal method. The microscopic characterizations and theoretical calculations revealed the formation of such unprecedented dual-sulfur-vacancies ensured the tight interfacial contact for fast charge separation. Besides, the existence of 1T-MoS 2 phase further improved the conductivity and strengthened the adsorption interaction with H + intermediate. Therefore, the radiolytic radical chemistry offered a facile, ambient and effective synthetic strategy to improve the catalytic performances of photocatalytic materials.
研究领域:
材料科学
·
纳米技术
·
光催化
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xuan Zheng,Yijun Liu,Zehua Zou,Qingxiang Wang
Developing efficient non-precious-metal-based bifunctional electrocatalysts for overall water splitting (OWS) is of great significance from both industrial and environmental perspectives. Herein, a novel flower-like architectured nanocomposite containing amorphous NiFe-hydroxide and NiFe-thiourea coordination complex, namely NiFe(O x H y )(TU)/NF, has been in situ synthesized on nickel foam by a simple simmer-assisted synthesis method. This nanomaterial demonstrates remarkable electrocatalytic performance and long-lasting durability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Specifically, the overpotentials required to achieve a current density of 50 mA cm −2 for HER and OER are as low as 273 and 243 mV, respectively. Moreover, the OWS electrolyzer assembled using NiFe(O x H y )(TU)/NF as both anodic and cathodic electrodes operates efficiently with an exceptionally low cell voltage of 1.47 V and 1.72 V at a current density of 10 mA cm −2 and 50 mA cm −2 , exhibiting negligible fluctuation over 55 hours. And this device can also be facilely driven by the photovoltaic cell. These excellent catalytic performances of NiFe(O x H y )(TU)/NF can be attributed to the electronic synergistic effects among multiple NiFe species like NiFe-hydroxide and NiFe-thiourea, as well as the abundant active sites induced by the nanoflower-like amorphous hierarchical structure. This study presents a practical and facile strategy for the synthesis of NiFe-based amorphous nanomaterial with robust OER and HER performances, thereby contributing to the advancement of multi-component bifunctional 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
Journal of Energy Storage
·
2020
·
IF 3.762
Hui Peng,Shengliang Qi,Qian Miao,Rui Zhao,Yipu Xu,Haikuo Lei,Fei Wang,Guofu Ma,Ziqiang Lei
Herein, novel polyimide (PI) nanoflowers with intertwined nanosheets is synthesized by one-step hydrothermal "bottom-up" self-assembly crystal growing process by using low-cost aromatic diamine and dianhydride as monomers. Then, hierarchical polyimide-based porous carbon nanoflowers (PI-CNFs) are prepared by synchronous activation and catalytic carbonization approach utilizing polyimide as carbon precursor and FeCl 3 as activating agent and catalyst. Owing to its unique interlaced porous nanosheet structure, high specific surface area and high nitrogen doping content, the PI-CNFs possesses high specific capacitance, capacity rate performance and overlength cycle life. In addition, a novel symmetrical aqueous supercapacitor assembled with PI-CNFs has a large operating voltage of 2.0 V, a high specific energy of 18.3 Wh kg −1 at specific power of 500 W kg −1 , as well as excellent cycling stability. Therefore, this work will propose an affordable strategy for designing novel polymer nanosheets, and open up the possibility of easy preparation, environmentally friendly and low-cost synthetic polymers-based carbon nanosheets to meet the energy storage demands.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Yuantao Pei,Liang Huang,Lei Han,Haijun Zhang,Longhao Dong,Quanli Jia,Shaowei Zhang
Developing user-friendly electrodes for efficiently producing hydrogen from water to substitute non-renewable fossil fuels is one of the challenges in the hydrogen energy field. For the first time, we have prepared self-supporting ultrahigh porosity cobalt foam loaded with NiCoP/NiOOH nanoflowers (NiCoP/CF) via freeze-drying and phosphorization. The as-prepared hierarchical NiCoP/CF electrodes showed superior catalytic activity for hydrogen evolution reaction (HER) in alkaline media. The one resulted from phosphorization at 350 °C (NiCoP/CF-350) only required overpotential of −47, and −126 mV to deliver geometrical current density of −10 mA cm −2 and −100 mA cm −2 , respectively, demonstrating improved catalytic activity than the electrodes prepared using a commercial nickel foam as a support. Moreover, it could retain its superior stability at a current density higher than −500 mA cm −2 for 16 h. Such an outstanding performance can be attributed to the ultrahigh porosity of Co foam support, optimal adsorption energies of HER intermediates (H∗), facile water dissociation on the NiCoP/NiOOH hetero-interfaces, and the assistance of NiOOH facilitating the electrons transfer from the Co foam inside to the NiCoP outside. The work would provide a new strategy for future design of advanced HER electrocatalysts.
研究领域:
材料科学
·
能源科学
✓ 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）