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Effect of preparation methods on tosufloxacin tosylate/ hydroxypropyl-β-cyclodextrin inclusion complex
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Sun, Jianfei

; Hong, Hailong

; Zhu, Ning

; Han, Limin

; Suo, Quanling

Brazilian Journal of Pharmaceutical Sciences

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2022, Volume 58 elocation e18650

Resumo: En | Texto: En | PDF: En

Abstract The main purpose of this work was to compare the effects of the four preparation methods on the TFLX/HP-β-CD inclusion complex. The effects of different preparation methods on the inclusion complex were investigated by SEM, DSC, PXRD, FT-IR and 1H NMR. All the characterization information indicated that the four preparation methods could cause interaction between TFLX and HP-β-CD, but the inclusion complex prepared by solvent evaporation has more reaction sites. Phase solubility experiments demonstrated that the inclusion reaction was spontaneous. In vitro dissolution experiments showed that the dissolution of the inclusion complex in water was: solvent evaporation method (64.39%) > grinding method (42.37%) > ultrasonic method (40.00%) > freezing method (36.08%), and all higher than pure TFLX and physical mixture. These results suggest that the solvent evaporation is the most suitable method for preparing TFLX/HP-β-CD inclusion complexes.

https://doi.org/10.1590/s2175-97902022e18650

Atomization Characteristics of Droplet and Morphologies of Arc Sprayed Ni-Al Particles and Composition Coatings
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Wang, Jixiao

; Wang, Jun

; Jin, Guo

; Wang, Li

; Mo, Caisong

; Ma, Li

; Li, Bairu

; Wang, Yongdong

; Shen, Hongxian

; Lu, Xing

; Lv, Yunzhuo

; Yuan, Siyu

; Zhang, Jian

; Huang, Yongjiang

; Cao, Fuyang

; Sun, Jianfei

Materials Research

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2019, Volume 22 Nº 4 elocation e20190034

Resumo: En | Texto: En | PDF: En

Droplet atomization characteristics and its morphology in twin-wire arc sprayed (TWAS) Ni-Al were explored in depth. Both numerical model and theoretical method were built for calculating the process of the droplet deformation and breakup in air flow, which based on the standard k-ε model and the volume of fluid (VOF) dual-phase flow model. The atomization characteristics of double droplets and three droplets were also studied in the atomization process by simulation. The micro structure and the morphology of the composite coatings were analyzed by SEM and TEM. The experimental results indicate that TWAS droplets are the process of explosive breakup or two steps breakup. Morphology of the TWAS prepared Ni-20wt.%Al and Ni-5wt.%Al particles was accordingly characterized by SEM. The phase compositions of the Ni-Al particles were obtained by EDS. By testing the velocity of sprayed particles, the change rule of particles with spray pressure was obtained. Ni twins are discovered in the Ni-Al coating due to rapid cooling in TWAS process.

https://doi.org/10.1590/1980-5373-mr-2019-0034 854 downloads

Deformation and Solidification Characteristics and Microstructure of Arc Sprayed Ni-Al Composition Coatings
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Wang, Jixiao

; Wang, Jun

; Jin, Guo

; Wang, Li

; Mo, Caisong

; Ma, Li

; Shen, Hongxian

; Cao, Fuyang

; Sun, Jianfei

Materials Research

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2019, Volume 22 Nº 6 elocation e20190462

Resumo: En | Texto: En | PDF: En

Droplets deformation and solidification characteristics in twin-wire arc sprayed Ni-Al were explored in depth. Both theoretical method and numerical model were established for calculating the deformation process of the droplets impacting on the substrate and their solidification behavior in airflow, which based on two models of the volume of fluid (VOF) dual-phase flow and the standard k-ε. The morphology and the microstructure of the composite coatings were analyzed by XRD, SEM and TEM. The results of the experiment indicate the droplets cooling rate ranges from 3.0×107 to 7.5×107 K/s. The main components of Ni-5wt.% Al coating were Ni solid solution, and a small number of Ni3Al4, Al2O3 and NiO. The main phases of Ni-20wt.% Al coating are Ni3Al and NiAl. EDS and TEM analysis shows that there are a few amorphous and equiaxed crystals in the Ni-Al coating. The surface roughness increases with the decrease of spraying pressure and spraying distance.

https://doi.org/10.1590/1980-5373-mr-2019-0462 467 downloads

Microstructure and Flight Behaviors of Droplet and its Solidification in Twin-Wire Arc Sprayed Ni-Al Composite Coatings
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Wang, Jixiao

; Wang, Yongdong

; Liu, Jingshun

; Zhang, Lunyong

; Gao, Limin

; Zheng, Guanghai

; Shen, Hongxian

; Sun, Jianfei

Materials Research

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Jun 2018, Volume 21 Nº 3 elocation e20170394

Resumo: En | Texto: En | PDF: En

Droplet flight and solidification behaviors during twin-wire arc sprayed (TWAS) composite coatings were systematically investigated. Both theoretical model and numerical method were established for calculating the droplet deformation, breakup and solidification process in air flow based on the volume of fluid (VOF) dual-phase flow model jointed with the standard k-ε model. The experimental simulation results indicate that TWAS droplet is broken through explosion or two steps breaking process. The calculation of TWAS gas flight dynamics demonstrates that the TWAS particles are accelerated at first and then slowed down. Microstructure of the TWAS prepared Ni-5wt.%Al and Ni-20wt.%Al composite coating was accordingly characterized by XRD, SEM and TEM, so the phase compositions of the Ni-Al composite coatings were obtained. TEM analysis also showed that an amorphous phase was formed according to the characteristic of diffraction ring in Ni matrix solid solution at an original state.

https://doi.org/10.1590/1980-5373-mr-2017-0394 955 downloads

Comparative Study of Magnetic Properties and Microstructure for As-cast and Square-wave Pulse Current Joule Annealed Wires
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Liu, Jingshun

; Shen, Hongxian

; Jia, Yandong

; Chen, Dongming

; Du, Zhaoxin

; Han, Yongquan

; Ma, Wen

; Sun, Jianfei

Materials Research

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Nov 2015, Volume 18 Páginas 29 - 33

Resumo: En | Texto: En | PDF: En

We here report on a comparative study of the microstructure and magnetic properties of as-cast and SPCJA-ed Co-based wires for potential sensor applications. Experimental results indicate that both as-cast and SPCJA-ed wires exhibit typical amorphous feature. There also exists the enhanced local ordering degree of atomic arrangement and obvious transformation (maximum magnetic permeability and minimum saturation magnetization) of magnetic properties after SPCJA treatment, resulting from variation of magnetic moment exchange coupling and magnetic anisotropy by coactions of high-density pulsed magnetic field energy and thermal activation energy. Moreover, SPCJA treatment can drastically improve the GMI property of melt-extracted wires. GMI ratio [ΔZ/Z0]max of 166.07% and field response sensitivity ξmax of 413.76%/Oe by more than 2.25 times and 1.73 times of as-cast wire at 5MHz. Therefore, the SPCJA-ed wire exhibits the improved GMI and magnetic properties at 5MHz~10MHz in contrast to AC annealed wire, which is more suitable for GMI sensor applications working at low-applied-frequency and relatively low-working-magnetic field.

https://doi.org/10.1590/1516-1439.324014 2796 downloads

The Formation Mechanism of Porosity for Spray-deposited 7075 Alloy
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Cao, Fuyang

; Li, Haichao

; Ning, Zhiliang

; Jia, Yandong

; Gu, Xu

; Yu, Lei

; Liu, Zuyan

; Sun, Jianfei

Materials Research

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Nov 2015, Volume 18 Páginas 89 - 94

Resumo: En | Texto: En | PDF: En

The distribution model of temperature for the billets was established based on the porosity formation mechanism. By calculating the numerical relationship between the temperature of the deposition layer and the formation ability of the porosity, the distribution of porosity for spray formed 7075 aluminum billets was predicted and the influence of superheat on the formation probability of porosity was analyzed. The results show that a denser billet can be obtained with the average temperature of 813 K of the droplets and a liquid fraction of 50%. The porosity would increase whether the temperature further increased or decreased. Finally, the 7075 aluminum alloy was prepared by spray deposition technique with the optimum process parameters. It can be found that the distribution and types of the porosity were different at different locations. These results are in good agreement with the porosity distribution law.

https://doi.org/10.1590/1516-1439.328414 1423 downloads

Magnetocaloric Effect in Uncoated Gd55Al20Co25 Amorphous Wires
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Xing, Dawei

; Shen, Hongxian

; Liu, Jingshun

; Wang, Huan

; Cao, Fuyang

; Qin, Faxing

; Chen, Dongming

; Liu, Yanfen

; Sun, Jianfei

Materials Research

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Nov 2015, Volume 18 Páginas 49 - 54

Resumo: En | Texto: En | PDF: En

The Gd55Al20Co25 amorphous wires exhibit a relatively strong magnetocaloric effect (MCE). These melt-extracted amorphous wires display second-order magnetic transition (SOMT) and the value of maximal magnetic entropy (–ΔSm) for the melt-extracted wires is calculated to be ~9.7 J·kg–1·K–1 around the Curie point (TC) of ~110 K with applied field of 5 T. Moreover, the melt-extracted amorphous wires show a high refrigerating efficiency with a relatively large cooling power (RCP, ~804 J·kg–1) and refrigeration capacity (RC, ~580 J·kg–1) under an applied magnetic field of 5T due to the broad paramagnetic-ferromagnetic (PM-FM) region associated with amorphous alloys. These favorable properties make melt-extracted Gd-based amorphous wires to be the potential refrigerant for magnetic refrigeration (MR) of liquid oxygen.

https://doi.org/10.1590/1516-1439.325414 1920 downloads

Domain Transformation and MI of Melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 Microwires by Cryogenic Joule Annealing
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Xing, Dawei

; Chen, Dongming

; Liu, Jingshun

; Zhang, Lunyong

; Shen, Hongexian

; Liu, Fang

; Sun, Jianfei.

Materials Research

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Nov 2015, Volume 18 Páginas 72 - 77

Resumo: En | Texto: En | PDF: En

Giant magneto-impedance (GMI) effect and domain transformation for melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 amorphous wires have been induced by a cryogenic Joule annealing (CJA) treatment with different DC current amplitude (0~350 mA) for 240s. Experimental results indicate that the maximum GMI ratio ([ΔΖ∕Ζ0]max) achieves to 188.1% with exciting field increasing to 1.8 Oe monotonically for 300 mA annealing treated wires, which can attribute to the surface complex domain structure change formed by CJA treatment. The liquid nitrogen can protect the wire from crystallization when applied large DC currents. Moreover, the CJA treatment can improve the response sensitivities effectively. These remarkable characteristics make the melt-extracted microwires by CJA tailoring as the promising candidate material for small-sized magnetic sensors.

https://doi.org/10.1590/1516-1439.327914 1040 downloads

Tensile Properties and Fracture Reliability of Melt-extracted Gd-rich Amorphous Wires
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Shen, Hongxian

; Xing, Dawei

; Wang, Huan

; Liu, Jingshun

; Chen, Dongming

; Liu, Yanfen

; Sun, Jianfei

Materials Research

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Nov 2015, Volume 18 Páginas 66 - 71

Resumo: En | Texto: En | PDF: En

Gd60Al20Co20 amorphous wires with smooth surfaces and circular cross-sections were fabricated by a melt-extraction technique. The mechanical properties of the extracted microwires were evaluated by tensile tests and their fracture reliability was estimated by using Lognormal and two- or three- parameter Weibull analysis, respectively. The microwires exhibit a tensile fracture strength ranging from ~788 to ~1196 MPa, with a mean value of 1008 MPa and a standard variance of 121 MPa. Lognormal method of statistical analysis presents that the average stress of microwires is ~1012 MPa. Weibull statistical analysis indicates that the two-parameter tensile Weibull modulus is 8.5 and the three-parameter Weibull modulus is 5.3 with a threshold value ~365 MPa for as-extracted amorphous microwires. Our results show that the extracted Gd-based wires possess excellent tensile properties and high fracture reliability, with a high potential for applications in and magnetic refrigeration.

https://doi.org/10.1590/1516-1439.325514 1182 downloads

10.

Superelasticity in Polycrystalline Ni-Mn-Ga-Fe Microwires Fabricated by Melt-extraction
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Liu, Yanfen

; Zhang, Xuexi

; Liu, Jingshun

; Xing, Dawei

; Shen, Hongxian

; Chen, Dongming

; Sun, Jianfei

Materials Research

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Nov 2015, Volume 18 Páginas 61 - 65

Resumo: En | Texto: En | PDF: En

Ni48Mn26.4Ga19.7Fe5.9 microwires with grain size of 1-3 micron were successfully fabricated by melt-extraction. The superelastic effects in the microwires under various temperatures and loads were systematically demonstrated. The as-extracted microwires displayed partial superelasticity when attended at relatively high temperature. The critical stress for stress-induced martensite formation increases linearly with temperature and follows the Clausius-Clapeyron relationship. The temperature dependence of the as-extracted polycrystalline Ni48Mn26.4Ga19.7Fe5.9 microwires is 16.4 MPa/K, which is higher compared with Ni-Mn-Ga single crystals. In addition, the as-extracted microwires display excellent shape memory behavior with the recovery strain and recovery ratio of 1.26% and 86%, respectively, when the total strain reaches 1.47% at 310 K.

https://doi.org/10.1590/1516-1439.325914 9008 downloads

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