CHEMOSPHERE
·
2020
·
IF 5.778
Bao Zhu,Xiaoran Wei,Jian Song,Qiu Zhang,Wei Jiang
Aluminium oxide nanoparticles (Al 2 O 3 NPs) potentially cause health hazards after their release into the environment. The crystalline phase of Al 2 O 3 NPs determines their surface structure and the number of functional groups. The adsorption of natural organic matter (NOM) or biomolecules on the surface Al 2 O 3 NPs also alters their surface properties and subsequent interactions with organisms. In this study, the roles of the Al 2 O 3 crystalline phase and the surface coating of the nanoparticles on the membrane integrity and fluidity were investigated. Giant and small unilamellar vesicles (GUVs and SUVs) were prepared as model cell membranes to detect membrane disruption after exposure to Al 2 O 3 NPs. Due to amorphous structure and high surface activity of γ-Al 2 O 3 NPs, they had a stronger affinity with the membrane and caused more serious membrane rupture than that of α-Al 2 O 3 NPs. The deposition of Al 2 O 3 NPs on the membrane and the induced membrane disruption were monitored by a quartz crystal microbalance with dissipation (QCM-D) method. HA-coated Al 2 O 3 NPs disrupted the SUV layer on the QCM-D sensor, while BSA-coated Al 2 O 3 NPs only adhered to the membrane and induced unremarkable vesicle disruption. In addition, untreated γ-Al 2 O 3 NPs induced remarkable gelation of a negatively charged membrane, but other types of Al 2 O 3 NPs caused negligible membrane phase changes. The outcomes of this study demonstrate that the crystalline phase of the Al 2 O 3 NPs affects the integrity and fluidity of cell membranes. The protein coatings on the NPs weaken the NP-membrane interaction, while HA coatings increase the damage of the NP-induced interaction.
研究领域:
生物学
·
环境科学
·
纳米毒理学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Meng-Jie Cui,Imran Muhammad,Jian Feng,Tie-Zhen Ren
The crystal and particle size distribution of α-alumina (α-Al 2 O 3 ) nanoparticles is increasingly important for their potential application. However, it is difficult to produce α-Al 2 O 3 nanoparticles due to the high activation energy barrier making it difficult to obtain a pure α-Al₂O₃. In this paper, α-Al 2 O 3 nanoparticles with an average size of 60 nm in width and about 100–300 nm in length were prepared using isopropanol through thermal treatment at 1200 °C, accompanied by a minor fraction of the θ phase. Addressing the challenge of achieving pure phase α-Al 2 O 3 , Density Functional Theory (DFT) calculation was conducted to explore the energy landscape similarity between the θ and α crystal phases. The results provided valuable insights into obstacles associated with obtaining pure α-Al 2 O 3 , enlightening the relationship between surface electronegativity and crystal phases. Furthermore, X-ray Photoelectron Spectroscopy and electrochemical tests were employed to demonstrate that the α phase could enhance the surface electronegativity of Al 2 O 3 . This comprehensive study not only encompasses the synthesis of Al 2 O 3 nanoparticles but also elucidates the distinctions between α and θ phases. These results offer valuable insights into methods optimizing for the synthesis of pure phase α-Al₂O₃.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Kai-Fei Wang,Xiao-Hui Yang,Kuo-Chih Chou,Guo-Hua Zhang
Oxide dispersion strengthened (ODS) WC Co cemented carbides with excellent mechanical properties were prepared by a facile three-step method. First, the mixture of ammonium paratungstate, cobalt oxalate and aluminum nitrate nonahydrate were roasted to generate precursor powder. Then, the precursor powder was reacted with insufficient carbon black to remove oxygen to aid precise carbon addition in the next step. Finally, depending on the carbon content difference between carbothermic reduction products and target product, the sample was mixed with the required carbon black to prepare WC Co Al 2 O 3 cemented carbides directly by the method of powder sintering . Experiments showed that after the addition of uniformly distributed nano-sized Al 2 O 3 particles, the mechanical properties included hardness and toughness of ODS cemented carbides improved. When the content of Al 2 O 3 was 0.5%, the densification of finally prepared WC-5.5wt%Co-0.5wt%Al 2 O 3 alloy could reach to 99.08%, and the values of fracture toughness and Vickers hardness were 11.35 ± 0.60 MPa·m 1/2 and 1756 ± 20.92 HV, respectively, thus giving excellent results.
研究领域:
材料科学
·
金属学
✓ 已验证
DOI
高影响因子
Journal of Chemistry
·
2020
·Vol. 2020
·期 1
·8758432
·
IF 1.79
Wu Yi-cheng,Yang Ai-li,Gao Wei,Fu Hai-yan,Wang Ze-jie
The roles of Al 2 O 3 nanoparticles on the removal of carbamazepine (CBZ) by Chlorella vulgaris immobilized in sodium alginate gel beads were for the first time investigated. The optimum conditions to prepare immobilized C. vulgaris beads with addition of Al 2 O 3 nanoparticles were determined as follows: C. vulgaris density was 3.0 × 10 6 cells for 1 mL sodium alginate solution, Al 2 O 3 nanoparticle concentration was 0.5 g/L, and concentrations of sodium alginate and CaCl 2 were 1.6% and 1%, respectively. The results showed that the proposed algae beads achieved the highest CBZ removal rate of 89.6% after 4 days of treatment, relative to 68.84%, 48.56%, and 17.76% in sodium alginate-immobilized C. vulgaris , free microalgae, and Al 2 O 3 nanoparticle alginate beads, respectively. The results also showed that the CBZ removal rate increased with more proposed algae beads, while decreased with increased bead diameter. The algae beads exhibited excellent CBZ removal ability even after three recycles. This work provided an economical and effective approach to remove CBZ from water.
研究领域:
环境科学
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水处理
·
微生物学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ruiqi Xu,Hongfei OuYang,Zeqin Huang,Gang Huang,Jin Wang,Guizhen Zhang
As one of the key components of supercapacitors (SCs), separators can directly affect the energy density, output power, and safety stability of SCs. However, it is still a challenge to prepare separators that simultaneously combine large pore size, ultrathin thickness, and excellent mechanical properties. Herein, a 5 μm ultrathin separator with a three-dimensional (3D) porous nanofiber skeleton dotted by fumed Al2O3 nanoparticles has been developed using biaxial stretching. The unique structure of the 3D porous nanofiber skeleton ensures a mechanical strength up to 40 MPa, while the fumed Al2O3 nanoparticles dotted on the 3D skeleton and the incorporation of the annealing process achieve a large average pore size of 130.8 nm, thus harmoniously resolving the contradiction between strength and large average pore size for ultrathin composite separators. The ultrathin thickness greatly shortens the ion transmission channel and effectively reduces ion transmission resistance. Moreover, the fumed Al2O3 nanoparticles exposed on the surface of the 3D porous nanofiber skeleton enhance the wettability of the electrolyte as well as the thermal stability of the separator, achieving a low bulk resistance of 0.3 Ω and zero shrinkage at 130 °C. Due to the unique structure, UAPFS7 offers a better overall performance compared to commercial separators. These findings indicate that the developed separators exhibit excellent comprehensive performance and have the potential to promote the large-scale application of next-generation energy storage devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dexuan Pei,Ziying Liu,Rui Ma,Shuo Huang,Shuen Hou,Min Liu,Guozhong Cao,Hongyun Jin
Composite polymer electrolytes (CPEs) have shown extraordinary promise for use in all-solid-state lithium metal batteries (LMBs) because of their tunable merits in ionic conductivity and mechanical flexibility. Their practical application is however hindered by the poor interface stability and the uncontrollable Li dendrite formation. Addressing these two issues, we report an in-situ formed Li-Al-O interface layer between CPEs and Li metal anode by introducing Al 2 O 3 nanoparticles in CPEs. X-ray photoelectron spectroscopy results indicated that the CPE-Al 2 O 3 could slowly release Al atoms which react with Li metal to form the current Li-Al-O interface layer. We highlight that the Li-Al-O interface layer can stabilize lithium deposition/stripping over 1400 h in lithium symmetric batteries, and afford an impressive cycle life of 300 cycles in LiFePO 4 -Li batteries with almost no capacity loss. The present findings demonstrate that in-situ constructing a slow-release Li-Al-O interface layer is an easy and effective approach to stabilize the solid electrolyte interface and suppress the Li dendrites growth. Furthermore, the obtained batteries show excellent cycling stability, indicating the strategy with in-situ formed CPEs shed light on improving the processability of fabrication of high-performance electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）