JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 98
·期 2
·422-429
·
IF 1.745
Shaoqiang Zhang,Dong Tian,Geng Zhang,Lin He,Hua Zheng,Jun Hu,Yi Li,Minxia Liu,Yaohua Hu,Wei Zhang
Abstract The peculiar magnetic properties of superparamagnetic iron oxide nanoparticles (SIONs) have spurred great interest in their potential application in enhancing medical images and drug delivery. Currently hindering the application of nanomagnetic particles in these fields is due to SIONs nonuniform size distribution, agglomeration, non-crystallinity, and low magnetic moment. In this paper, magnetic nanocrystals of different sizes and morphologies were prepared by the solvothermal method, which utilized an n-hexane-surfactant system with Fe(acac) 3 and iron-powder precursors. The crystalline structure and particle size of grown SIONs are characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). HRTEM showed that the SIONs were approximately 5.6–6.8 nm in size with no agglomeration and a uniform distribution. Within the reaction time, HRTEM also confirmed that the shape and nanocrystals of SIONs had changed from an irregular crystal shape to triangles and quadrilaterals, and finally to hexagonal nanoparticles. According to the test results of the magnetic properties test and the literature, the material that has been synthesized is a superparamagnetic material. And the maximum saturation magnetization was 62.65 emu/g, which is reported among the largest magnetic properties of SIONs at a size of 6.8 nm.
Superparamagnetic Fe 3 O 4 nanoparticals with different size and morphology were prepared by solvothermal method in N-hexane-surfactant system with the precursors of Fe(acac) 3 and iron powder. With the increasing reaction time and under the regulation of the surfactant molecules, the morphology and nanocrystals of SIONs have initially changed from the irregular crystal to triangles and quadrilaterals shape, and finally to the hexagonal nanoparticles.
研究领域:
生物医学工程
·
纳米材料科学
·
磁性材料
·
药物输送系统
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 5
·341
·
IF 4.3
Yaohui Xu,Yuting Li,Quanhui Hou,Liangjuan Gao,Zhao Ding
Based on the magnetic sensitivity of Fe3O4in various fields, we aimed to propose a one-step solvothermal process for the synthesis of single-phase Fe3O4induced by the reaction medium and urea, avoiding high-temperature reduction in H2or N2atmospheres. Feasibility was tested with purified water (H2O), methyl alcohol (MA), ethyl alcohol (EA), and ethylene glycol (EG) as reaction media. The findings indicated that the solvothermal reaction system utilizing EA was more effective for the synthesis of cubic magnetic Fe3O4. Optimal conditions for synthesizing pure Fe3O4were obtained by optimizing the urea amount and solvothermal reaction parameters. The optimal formulation consisted of 10 mmol of FeCl3, 80 mmol of urea, and 60 mL of EA subjected to a solvothermal process at 200 °C for 12 h. The resulting Fe3O4(magnetite, cubic) exhibited commendable crystallization with a morphology of acicular aggregates and displayed excellent magnetic sensitivity properties with a magnetization of 92.2 emu/g at 15,000 Oe. The photocatalytic degradation behaviors of the resulting Fe3O4to Methyl Orange, Orange G, and Acid Red 37 azo dyes and the repeated degradation performance of Methyl Orange dye were investigated. Nearly complete degradation of Methyl Orange dye occurred after 2.0 h of photocatalytic reaction, while Orange G and Acid Red 37 dyes achieved similar results after 3.5 and 4.5 h, respectively. The exploration strategy in this work for synthesizing magnetic Fe3O4can be applied to design and fabricate other metal oxides or composites, potentially resulting in novel discoveries in morphology or performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Dapeng Li,Jinqiang Wu,Jiangtao Duan,Xiaoxu Liu,Jingjing Gong,Suxiang Ge
Exploring the practical method to grow high quality metal phthalocyanine (MPc) crystals and understanding their growth mechanism is significant for their applications. In this study, manganese phthalocyanine (MnPc) crystals were successfully synthesized using simple substance Mn and dicyanobenzene in the reaction medium of ethanediol without any other chemical reagents. The well shaped quadrangular MnPc crystals more than 500 μm were in situ grown on Mn slice surfaces via a simple solvothermal reaction. XPS analyses show that Mn has the mixed chemical state of +3 and + 4 in MnPc. Ethanediol acted as not only the solvent but also acidic catalyst to boost the ionization of dicyanobenzene. Different from the reported synthesis of MPc crystals, MnPc crystals could be formed at a wide temperature range of 100–190 °C. The reaction time is the only experimental parameter to regulate the crystal growth. To the best of our knowledge, this is the first report on in situ synthesis of the high quality MnPc crystals on Mn substrate by using a simple solvothermal method.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 10
·7177-7182
·
IF 1.354
Pham Hau Quoc,Huynh Tai Thien,Van Nguyen At,Van Thuan Tran,Bach Long Giang,Thanh Ho Van Thi
The degradation of Pt-based catalysts is considered as the main barrier to the commercialization of fuel cells. M-doped TiO2 (M is a transition metal) has been investigated to improve the stability of electrocatalysts. Recently, W-doped TiO2 materials have been
found as a good catalyst support for the photocatalyst applications but their application in Proton-exchange membrane fuel cell application has rarely been reported. In addition, the agglomeration of nanoparticles, which are synthesized from the organic precursor, has been reported. Here,
we report Ti0.7W0.3O2 nanoparticles prepared via a one-step solvothermal method with inorganic precursors without using surfactants or stabilizers for restricting nanoparticle agglomeration. The properties of the material were measured by XRD, TEM, BET, and
electronic conductivity. The mean particle size of ∼5 nm, the high specific surface area of 126.471 m2/g and a moderate electronic conductivity of 0.014 S/cm were obtained for the sample prepared at 220 °C for 4 h. It was observed that using inorganic precursors to prevent
particle agglomeration is more advantageous compared to organic precursors as mentioned in previous reports.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 50
·31226-31234
·
IF 3.361
Dapeng Li,Peng Zhang,Suxiang Ge,Guofu Sun,Qin He,Wenjun Fa,Yun Li,Juntao Ma
Exploring the environmentally friendly and low-cost synthesis strategies of phthalocyanine (Pc) crystals in just one step is an absolute challenge. The solvothermal synthesis of phthalocyanine crystals shows the advantages of high-quality crystalline products, facile reaction and purification, and low cost. Nevertheless, only a few metal phthalocyanine crystals have been successfully synthesized via solvothermal reactions. In this study, we found that the crystalline β metal-free phthalocyanine needles could be directly prepared via the tetrapolymerization of phthalodinitrile catalyzed by DBU in solvothermal reactions. Similar to the preparation of β-phthalocyanine crystals, the α metal-free phthalocyanine crystals with the specific multiply-laminated structures can be obtained through solvothermal reactions assisted by DBN. SEM characterization showed that the individual β metal-free phthalocyanine has a well-defined quadrangular shape with smooth faces. However, the α metal-free phthalocyanine exhibits a distinctive undulating surface morphology. Both phthalocyanines showed satisfactory thermal stability (from room temperature to about 300 °C), excellent resistance to acid/alkali solution, and fast photoelectric response properties (order of magnitude of response time, 10−6 s) as tested by TG-DSC and TPV, respectively. It is noted that ethanol was used as the reaction medium and the resulting phthalocyanine crystals can be facilely purified using hot ethanol to dissolve the impurities adsorbed on the surfaces of phthalocyanine crystals. Compared to the traditional methods, no re-crystallization operation was carried out for our method. To the best of our knowledge, this is the first report on the solvothermal synthesis of metal-free phthalocyanine crystals with controllable crystal form adjusted by DBU/DBN in one step.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2012
·
IF 2.105
Jing Liu,Lu Wang,Jing Wang,Lantong Zhang
A new solvothermal method is proposed for the preparation of Fe 3 O 4 nanoparticles (NPs) from iron acetylacetonate in the presence of oleylamine and n- hexane. The products are characterized by X-ray powder diffraction, infrared (IR) spectroscopy, transmission electron microscopy, thermogravimetry/differential thermogravimetry (TG/DTG) analysis, and vibrating sample magnetometery. The new procedure yields superparamagnetic monodispersed Fe 3 O 4 particles with sizes ranging from 7 nm to 12 nm. The nanocrystal sizes are controlled by adjusting the volume ratio of oleylamine to n- hexane. IR and TG/DTG analyses indicate that the oleylamine molecules, as stabilizers, are adsorbed on the surface of Fe 3 O 4 NPs as bilayer adsorption models. The surface adsorption quantities of oleylamine on 7.5 and 10.4 nm-diameter Fe 3 O 4 NPs are 18% and 11%, respectively. The hydrophobic surface of the obtained nanocrystals is passivated by adsorbed organic solvent molecules. These molecules provide stability against agglomeration, enable solubility in nonpolar solvents, and allow the formation of magnetic polymer micelles.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Yi Liu,Yongjin Ma,Wenwen Liu,Yanyang Shang,Anquan Zhu,Pengfei Tan,Xiang Xiong,Jun Pan
As the highest energy facet of wurtzite CdS, (0 0 2) facet is well worth investigating toward the contribution in photocatalytic hydrogen (H 2 ) evolution. In this study, flower-like CdS with highly preferred (0 0 2) facet was fabricated through a low temperature mixed-solvothermal strategy. The mixted-solvent of diethylenetriamine (DETA) and ethyl alcohol (EtOH) was used to inhibit the growth of (1 0 0) and (1 0 1) facets. For comparison, porous flower-like, belt-like and net-like CdS samples with different preferred degrees of (0 0 2) facet were controllably synthesized by the addition of H 2 O in different proportions. The preferred orientation degrees of (0 0 2) facet were qualitative proved by the mathematical fitting of XRD patterns. As expected, the flower-like CdS exhibited the highest photocatalytic activity on H 2 evolution under visible light without any co-catalyst. Meanwhile, the photocatalytic H 2 production increased with the increasement of exposed (0 0 2) facet, which suggested that (0 0 2) facet of CdS played a critical role in improving the photocatalytic activity. Moreover, the growth mechanisms of CdS with various morphologies were investigated and proposed in detail.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Meiling Xie,Hekai Zhu,Minghao Fang,Zhaohui Huang,Yan’gai Liu,Xiaowen Wu
Ti 2 Nb 10 O 29 photocatalysts were successfully synthesized by three different methods. Ti 2 Nb 10 O 29 fabricated by the solvothermal method (ST-TNO) exhibited unique microspheres compared to the larger irregular particles observed for the samples annealed in air (Air-TNO) and Ar (Ar-TNO). X-ray Photoelectron Spectroscopy (XPS) results revealed that a partial reduction process from Ti 4+ into Ti 3+ occurs in Ar-TNO, because of the introduction of oxygen defects. Ar-TNO exhibited visible-light absorption with a band gap of 2.85 eV, while the absorption edges of Air-TNO and ST-TNO were approximately 400 nm. Under UV light irradiation (λ < 420 nm), Ar-TNO exhibited a photocatalytic activity 2.1 times greater than that of Air-TNO, corresponding to the highest activity. The results indicated that the preparation method is crucial for determining the band gap and photocatalytic activity of semiconductors. Moreover, the novel semiconductor photocatalyst can be further applied for constructing the heterojunction and designing the band structure.
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
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Heqin Huang,Yuanyuan Ding,Xilu Chen,Zhiyong Chen,Xiang Zheng Kong
A facile method was proposed to produce monodisperse poly(divinylbenzene) microspheres in a quiescent mode by means of a combination of solvothermal process and classical precipitation polymerization. Spherical particles were obtained using this method at a monomer concentration of 20 wt%, with respective to the solvent, that was 2–4 folds higher than that in traditional precipitation polymerization. The diameter of monodisperse microspheres could be controlled in the range of 0.88–4.18 μm by adjusting reaction conditions. When the reaction temperature was optimized between 85 °C and 100 °C, above the boiling point of the solvent, i.e. acetonitrile, the yield of microspheres reached 93.7% within 4 h of polymerization with a narrowed polydispersity index of 1.033. The uniformity of the microspheres was improved by adjusting initiator concentration. This polymerization strategy with high efficiency is of potential in fabrication of various monodisperse microspheres.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 1
·163-176
·
IF 3.442
Yu Sheng,Yuan Guoming,Gao Hejun,Liao Yunwen
The self-assembled polymer nanotubes were obtained by a simple solvothermal method. Its physicochemical properties were characterized by SEM, BET, TGA, FT-IR, XPS, and solid-state 13 C magnetic resonance. The effects of initial pH, dosage, and coexisting ions were evaluated for its Cr(VI) adsorption performances. The result showed that polymer nanotubes surface had a large number of organic functional groups and porous structures. In 140 mg/L Cr(VI) solution, polymer nanotubes obtained the largest Cr(VI) adsorption capacity of 147.81 mg/g. Adsorption kinetics and isotherms agreed well with the pseudo-second-order and Redlich–Peterson models, respectively. The desorption process showed that the polymer nanotubes were easy to regenerate in strong polarity solution and had a high removal efficiency. Ionic strength played an important role in the adsorption and the adsorption interaction contained electrostatic interaction, reduction, and chelation in this work. The self-assembly method will constitute a highly efficient adsorbent.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL COMMUNICATIONS
·
2014
·Vol. 50
·期 21
·2755-2757
·
IF 6.718
Zhao Zhao,Huaqiao Tan,Haifeng Zhao,Yang Lv,Li-Jing Zhou,Yujiang Song,Zaicheng Sun
Stable reduced TiO2 rutile nanorods with well-defined facets were prepared by a solvothermal route in the presence of Zn powder. The oxygen vacancy in the TiO2 nanorods, which can be tuned by the amount of Zn, results in a narrow band gap and visible-light photocatalytic activity.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Shan Zhang,Yupeng Lu,Yahao Geng,Yixin Yin,Guiyong Xiao
Hydroxyapatite (HA) is an important component of mammalian bones and teeth. Its superior biocompatibility, biological activity, and bone tissue regenerative properties make it an ideal material for bone tissue replacement and regeneration. The morphological characteristics of HA can affect its selection in various applications. In contrast, one-dimensional (1D) micro/nano-structured HA has received widespread attention in the field of biomedicine. In particular, HA ultra-long nanofibers possess excellent mechanical properties, such as flexibility and deformability, overcoming the brittleness of traditional HA ceramic materials. This work successfully synthesized HA ultra-long nanofibers using oleic acid as a template by a solvothermal method. Particularly, the effects of the initial Ca/P ratios (iCa/P) on the morphologies of HA products were investigated. The microstructure and properties of HA products were characterized by scanning electron microscopy (SEM), X-ray powder diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the uniform and flexible HA nanofibers can be obtained only under the appropriate iCa/P. In addition, the effect of iCa/P on the microstructures of the HA formation stages was investigated using transmission electron microscopy (TEM), and then the formation mechanism of HA nanofibers was proposed. In this process, it is found that HA nanofibers mainly grow selectively along the c-axis, while iCa/P precisely influences the preferential growth direction of HA products.
研究领域:
生物材料学
·
医学
✓ 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）