One-step hydrothermal synthesis of carbonated hydroxyapatite porous microspheres with a large and uniform size regulated by l-glutamic acid

CrystEngComm ◽  
2016 ◽  
Vol 18 (31) ◽  
pp. 5876-5884 ◽  
Author(s):  
Mei-li Qi ◽  
Jia Qi ◽  
Gui-yong Xiao ◽  
Kai-yuan Zhang ◽  
Chen-yu Lu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Glutamic Acid ◽  
Average Diameter ◽  
Step Method ◽  
Uniform Size ◽  
Porous Hydroxyapatite ◽  
Carbonated Hydroxyapatite ◽  
Porous Microspheres ◽  
One Step ◽  
Interconnected Pores

Carbonated porous hydroxyapatite microspheres with an average diameter of about 64 μm and interconnected pores were hydrothermally synthesized by a one-step method.

Electrospun Zn Doped CuFe2O4 Nanofibers with Enhanced Photo Fenton-Like Catalytic Activity

2021 ◽  
Vol 21 (3) ◽  
pp. 1517-1525
Author(s):  
Yongping Cui ◽  
Yaru Shang ◽  
Xiaohu Cheng ◽  
Ruixia Shi ◽  
Ping Yang
Keyword(s):  
Catalytic Activity ◽  
Catalytic Mechanism ◽  
Spinel Ferrite ◽  
Degradation Efficiency ◽  
X Ray Diffraction ◽  
Step Method ◽  
Uniform Size ◽  
Zn Content ◽  
Electrospinning Method ◽  
One Step

One dimensional Zn doped CuFe2O4 spinel ferrite nanofibers were successfully prepared via a facile electrospinning method followed by two different calcination routes. The results showed that the as-prepared nanofibers through two-step calcination exhibited more uniform size distribution in diameter compared with those calcined by one-step method. X-ray diffraction (XRD) results indicated that with the increase of Zn content the position of diffraction peaks of Zn doped CuFe2O4 slightly shift towards lower 2θ angle because the ionic sizes of the Zn2+ (0.74 Å) is larger than that of Cu2+ (0.69 Å). Fourier transform infrared spectroscopy (FTIR) results showed that with increasing Zn content the position of vibrational band (590 cm−1) shifted towards the smaller wavenumber. Generally, photo-generated carriers increased with the increasing of Zn content. The photo Fenton-like catalytic results revealed that the doping of Zn facilitated the enhancement of degradation efficiency of catalysts. Additionally, 10 at.% Zn doped CuFe2O4 exhibited the best photo Fenton-like catalytic activity and the degradation efficiency of Rhodamine B (RhB) could reach 100% in 40 min. Finally, the enhancement of photo Fenton-like catalytic mechanism of the Zn doped CuFe2O4 nanofibers was mainly attributed to actived spinel structure lattice by Zn doping, which allows more Cu2+ and Fe3+ ions are involved in the photo Fenton-like catalytic reaction.

scholarly journals Synthesis of functional magnetic porous SrFe12O19/P(St-DVB-MAA) microspheres by a novel suspension polymerization

2008 ◽  
Vol 6 (4) ◽  
pp. 627-633 ◽  
Author(s):  
Sifang Kong ◽  
Jiang Cheng ◽  
Yangsheng Liu ◽  
Xiufang Wen ◽  
Pihui Pi ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Suspension Polymerization ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Conductometric Titration ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
Porous Microspheres ◽  
Magnetic Porous Microspheres

AbstractIn this study, a novel and effective suspension polymerization has been employed to prepare functional magnetic porous SrFe12O19/P(St-DVB-MAA) microspheres in the presence of bilayer surfactants (sodium dodecyl benzene sulfonate (SDBS) and oleic acid (OA)) coated on micro-size magnetic SrFe12O19. This was achieved by pre-polymerizing the organic phase, which contained co-monomers, porogens and treated magnetic particles, at 65°C for 0.5 h under ultrasound conditions. Aqueous solutions containing a dispersion agent were then added to effect suspension polymerization. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and magnetic property measurement system (MPMS) were used to characterize the functional magnetic porous microspheres. The results show that the microparticles are well shaped with a uniform size distribution of about 0.5 ∼ 0.7 mm and the surfaces of the microspheres have many micro-pores with an average diameter of 0.533 µm. There are carboxyl groups (−COOH) on the surface of the microspheres to the extent of 0.65 mmol g−1, as determined by conductometric titration. According to the XRD spectra, iron oxide consists mainly of SrFe12O19 which reveals hexahedral structure. The content of magnetic SrFe12O19 reaches 17.81% (by mass), and the microspheres have good heat resistance. The magnetic porous microspheres are ferromagnetic with high residual magnetization and coercivity, 21.59 emu g−1 and 4.13 kOe, respectively. The saturation magnetisation is around 42.85 emu g−1.

scholarly journals One-Step Method to Prepare PLLA Porous Microspheres in a High-Voltage Electrostatic Anti-Solvent Process

Materials ◽  
2016 ◽  
Vol 9 (5) ◽  
pp. 368 ◽  
Author(s):  
Ying Wang ◽  
Li-Hui Zhu ◽  
Ai-Zheng Chen ◽  
Qiao Xu ◽  
Yu-Juan Hong ◽  
...  
Keyword(s):  
High Voltage ◽  
Step Method ◽  
Porous Microspheres ◽  
One Step

Facile hydrothermal synthesis of CuO–Cu2O/GO nanocomposites for the photocatalytic degradation of organic dye and tetracycline pollutants

2020 ◽  
Vol 44 (16) ◽  
pp. 6420-6427 ◽  
Author(s):  
Zhuanfang Zhang ◽  
Li Sun ◽  
Zhaojun Wu ◽  
Yongzhi Liu ◽  
Shaobin Li
Keyword(s):  
Hydrothermal Synthesis ◽  
Photocatalytic Degradation ◽  
Organic Dye ◽  
Step Method ◽  
Photocatalytic Mechanism ◽  
One Step

A bifunctional nanoscale photocatalyst was constructed by developing a one-step method for the in situ growth of CuO–Cu2O nanoparticles on GO sheets, and the photocatalytic mechanism was inferred.

scholarly journals Synthesis of Monoclinic Vanadium Dioxide via One-Pot Hydrothermal Route

2021 ◽  
Vol 5 (1) ◽  
pp. 13
Author(s):  
Guowei Liu ◽  
Zengyan Du ◽  
Ming Li ◽  
Yi Long
Keyword(s):  
Hydrothermal Synthesis ◽  
Vanadium Dioxide ◽  
Annealed Sample ◽  
Solar Modulation ◽  
Smart Window ◽  
Hydrothermal Route ◽  
One Pot ◽  
Uniform Size ◽  
One Step ◽  
The One

Pure monoclinic vanadium dioxide nanoparticles (VO2 NPs) with a controlled uniform size are considered essential for the preparation of thermochromic smart window coatings on desired substrates. Herein, we report a facile one-step hydrothermal synthesis of VO2(M) NPs without post-treatment of annealing, which may induce unwanted aggregation of NPs. In contrast with the annealed sample, the one-step processed VO2(M) NPs exhibit superior thermochromic performance with the solar modulation efficiency of 11.8% and luminous transmittance of 37.3%.

scholarly journals Interconnected porous hydroxyapatite ceramics for bone tissue engineering

2008 ◽  
Vol 6 (suppl_3) ◽  
Author(s):  
Hideki Yoshikawa ◽  
Noriyuki Tamai ◽  
Tsuyoshi Murase ◽  
Akira Myoui
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Animal Experiments ◽  
Average Diameter ◽  
Dimensional Structure ◽  
Uniform Size ◽  
Porous Hydroxyapatite ◽  
Hydroxyapatite Ceramics ◽  
Novel Scaffold

Several porous calcium hydroxyapatite (HA) ceramics have been used clinically as bone substitutes, but most of them possessed few interpore connections, resulting in pathological fracture probably due to poor bone formation within the substitute. We recently developed a fully interconnected porous HA ceramic (IP-CHA) by adopting the ‘foam-gel’ technique. The IP-CHA had a three-dimensional structure with spherical pores of uniform size (average 150 μm, porosity 75%), which were interconnected by window-like holes (average diameter 40 μm), and also demonstrated adequate compression strength (10–12 MPa). In animal experiments, the IP-CHA showed superior osteoconduction, with the majority of pores filled with newly formed bone. The interconnected porous structure facilitates bone tissue engineering by allowing the introduction of mesenchymal cells, osteotropic agents such as bone morphogenetic protein or vasculature into the pores. Clinically, we have applied the IP-CHA to treat various bony defects in orthopaedic surgery, and radiographic examinations demonstrated that grafted IP-CHA gained radiopacity more quickly than the synthetic HA in clinical use previously. We review the accumulated data on bone tissue engineering using the novel scaffold and on clinical application in the orthopaedic field.

scholarly journals Chitosan-Coated Magnetic Nanoparticles with Low Chitosan Content Prepared in One-Step

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Yolanda Osuna ◽  
Karla M. Gregorio-Jauregui ◽  
J. Gerardo Gaona-Lozano ◽  
Iliana M. de la Garza-Rodríguez ◽  
Anna Ilyna ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Weight Ratio ◽  
Average Diameter ◽  
High Yield ◽  
Infrared Spectrometry ◽  
Amino Groups ◽  
Step Method ◽  
Low Weight ◽  
One Step ◽  
Chitosan Content

Chitosan-coated magnetic nanoparticles (CMNP) were obtained at 50°C in a one-step method comprising coprecipitation in the presence of low chitosan content. CMNP showed high magnetization and superparamagnetism. They were composed of a core of 9.5 nm in average diameter and a very thin chitosan layer in accordance with electron microscopy measurements. The results from Fourier transform infrared spectrometry demonstrated that CMNP were obtained and those from thermogravimetric analysis allowed to determine that they were composed of 95 wt% of magnetic nanoparticles and 5 wt% of chitosan. 67% efficacy in the Pb+2removal test indicated that only 60% of amino groups on CMNP surface bound to Pb, probably due to some degree of nanoparticle flocculation during the redispersion. The very low weight ratio chitosan to magnetic nanoparticles obtained in this study, 0.053, and the high yield of the precipitation reactions (≈97%) are noticeable.

scholarly journals One-Step Method for Preparation of Magnetic Nanoparticles Coated with Chitosan

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Karla M. Gregorio-Jauregui ◽  
Ma. Guadalupe Pineda ◽  
Jorge E. Rivera-Salinas ◽  
Gil Hurtado ◽  
Hened Saade ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Measurements ◽  
Average Diameter ◽  
Superparamagnetic Nanoparticles ◽  
Step Method ◽  
Simple Method ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
One Step ◽  
Heavy Metal Ions Removal

Preparation of magnetic nanoparticles coated with chitosan in one step by the coprecipitation method in the presence of different chitosan concentrations is reported here. Obtaining of magnetic superparamagnetic nanoparticles was confirmed by X-ray diffraction and magnetic measurements. Scanning transmission electron microscopy allowed to identify spheroidal nanoparticles with around 10-11 nm in average diameter. Characterization of the products by Fourier transform infrared spectroscopy demonstrated that composite chitosan-magnetic nanoparticles were obtained. Chitosan content in obtained nanocomposites was estimated by thermogravimetric analysis. The nanocomposites were tested in Pb2+removal from a PbCl2aqueous solution, showing a removal efficacy up to 53.6%. This work provides a simple method for chitosan-coated nanoparticles obtaining, which could be useful for heavy metal ions removal from water.

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