陈建峰
纳米材料、超重力技术及应用、多相流反应工程。
个性化签名
- 姓名:陈建峰
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学术头衔:
博士生导师
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学科领域:
材料合成与加工工艺
- 研究兴趣:纳米材料、超重力技术及应用、多相流反应工程。
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10
陈建峰, Li-Jie Gao, Xiao-Lin Liu, Jing-Qiang Zhang, Song-Quan Wang, Jian-Feng Chen*
Materials Chemistry and Physics 88(2004)27-31,-0001,():
-1年11月30日
Using powders prepared by a high-gravity reactive precipitation process, grain-controlled barium titanate ceramics were obtained under conventional sintering conditions. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, as well as dielectric measurements were used to characterize the samples. The powder was densified to >95% of theoretical density when sintered at 1200℃ (K1200), and the average grain size of the resulting ceramics was <0.5μm. Increasing sintering temperature increased the grain size and did not arise the exaggerated grain growth. The grain size significantly affects the permittivity of the resulting ceramics. Room temperature permittivity of the sample K1200 showed relatively lowvalues (2800) compared with those (typically 4143) for ceramics sintered at 1250℃, consisting of larger grains (≈1μm). The lower permittivity was attributed to an incomplete development of the tetragonal structure.
Ceramics, Barium titanate, Sintering temperature, Dielectric properties
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【期刊论文】Feasibility of preparing nanodrugs by high-gravity reactive precipitation
陈建峰, Jian-Feng Chen a, *, Min-Yi Zhou a, Lei Shao a, Yu-Yong Wang a, Jimmy Yun b, Nora Y.K. Chewc, Hak-Kim Chan c
International Journal of Pharmaceutics 269(2004)267-274,-0001,():
-1年11月30日
To study the feasibility of producing nanoparticles of organic pharmaceuticals using a novel high-gravity reactive precipitation (HGRP) technique, reactive precipitation of benzoic acid as a model compound was carried out in a rotating packed bed under high gravity. The main factors such as the rotating bed speed, concentration and volume flow rate of the reactants (sodium benzoate and HCl) affecting the particle size of the precipitate were studied. Particle size was measured by transmission electron microscopy. Benzoic acid was precipitated as nanoparticles as fine as 10nm. The particle size was decreased with increasing rotating bed speed, concentration and volume flow rate of the reactants. The formation of ultrafine particles was due to intensified micro-mixing of reactants in the rotating bed to enhance nucleation while suppressing crystal growth. The results have demonstrated the feasibility to produce nanodrugs by the principle of acid-base precipitating reaction using HGRP.
Nanodrugs, Benzoic acid, High-gravity technology, Rotating packed bed
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陈建峰, Zhu-Zhu Li, Li-Xiong Wen, Lei Shao, Jian-Feng Chen*
Journal of Controlled Release 98(2004)245-254,-0001,():
-1年11月30日
Preparation and characterization of porous hollow silica nanoparticles (PHSN) for controlled release applications were investigated. Through orthogonally designed experiments, the optimal synthesis conditions for the preparation of PHSN were obtained and the produced PHSN were characterized by BET, SEM, TEM and IR. Scanning and transmission electron microscopy images revealed their hollow shell-core structure and also demonstrated that the size and shape of PHSN are determined by the templating CaCO3 nanoparticles. The produced PHSN were applied as a carrier to study the controlled release behaviors of Brilliant Blue F (BB), which was used as a model drug. Being loaded into the inner core and on the surfaces of the nanoparticles, BB was released slowly into a bulk solution for about 1140min as compared to only 10min for the normal SiO2 nanoparticles, thus exhibited a typical sustained release pattern without any burst effect. In addition, higher BET of the carriers, lower pH value and lower temperature prolonged BB release from PHSN, while stirring speed showed little influence on the release behavior. It showed that PHSN have a promising future in controlled drug delivery applications.
Porous hollow silica nanoparticles, Controlled release, Brilliant Blue F (, BB), , Drug delivery system
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【期刊论文】Dispersion of nanosized aqueous suspensions of barium titanate with ammonium polyacrylate
陈建峰, Zhi-Gang Shen, a, Jian-Feng Chen, *, Hai-kui Zou, and Jimmy Yun b
Journal of Colloid and Interface Science 275(2004)158-164,-0001,():
-1年11月30日
The colloidal stability of nanosized barium titanate (BaTiO3) aqueous suspensions with ammonium polyacrylate (PAA-NH4) at different pH values has been investigated by means of zeta potential, adsorption isotherm, sedimentation, and rheology characterization. The isoelectric point of BaTiO3 powders is at pH 2.5 and the value of zeta potential is at its maximum near pH 10. The amount of leached barium ion decreases with increasing pH, but the change decreases with increasing initial pH. Adsorption of PAA-NH4 onto the surface of BaTiO3 decreases its zeta potential. Results show that PAA-NH4 adsorption follows Langmuir monolayer adsorption isotherms and the amount of PAA-NH4 required to stabilize nanosized BaTiO3 suspensions decreases as the pH increases. The mechanism of stabilization of BaTiO3 is shown to be electrosteric under the experimental conditions. Good agreement between zeta potential, sedimentation, and rheological tests is found, which identifies an optimum pH value of about 10 and an optimum dispersant concentration of about 2.0wt%, independent of the solids volume fraction of suspensions.
Suspensions, Nanosized BaTiO3, Rheology, Polyacrylic acid salt, Adsorption
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陈建峰, Jianfeng Chen a, *, Taobo He a, Wei Wu a, Dapeng Cao b, Jimmy Yun b, Chee King Tan b
Colloids and Surfaces A: Physicochem. Eng. Aspects 232(2004)163-168,-0001,():
-1年11月30日
Adsorption of sodium salt of poly (acrylic) acid (PAANa) on nano-sized CaCO3 surface was studied by using potentiometric titration. The dispersion of nano-sized CaCO3 in water was also studied, and the viscosity of nano-sized CaCO3 slurry was measured. The results indicate that the adsorption of PAANa on nano-sized CaCO3 is significantly affected by the pH of the slurry, and the saturation adsorption amount decreases as pH value increases. The dispersion of nano-sized CaCO3 in water depends on the amount of added PAANa and also on slurry pH value. In the range of the pH values studied, the stronger the alkalinity of nano-sized CaCO3 slurry, the better is the dispersion of nano-sized CaCO3 modified with PAANa. Moreover, there exists an optimum amount of the added PAANa corresponding to the lowest viscosity of the dispersion. In short, PAANa is an effective dispersant to improve the dispersion of nano-sized CaCO3 particles in water.
Sodium salt of poly (, acrylic), acid (, PAANa), , Nano-sized CaCO3, Zeta potential, Adsorption, Dispersion
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【期刊论文】Synthesis of nano-fibers of aluminum hydroxide in novel rotating packed bed reactor
陈建峰, Jian-Feng Chen*, Lei Shao, Fen Guo, Xing-Ming Wang
Chemical Engineering Science 58(2003)569-575,-0001,():
-1年11月30日
This paper presents a route of synthesizing nano-fibrillar aluminum hydroxide (AH) by carbonation in a novel rotating packed bed (RPB) reactor and thermal hydrolysis. Carbonation of sodium aluminate (SA) is conducted by introducing CO2 into RPB at room temperature to form AH gel which is subsequentlytreated bythermal hydrolysis for an optimum time of 30min and temperature of 85℃ to yield nano-fibrillar pseudoboehmite (PB) of 1-10nm in diameter and 50-300nm in length. Factors affiecting carbonation process such as high gravitylevel, Gas/Liquid ratio and SA solution concentration are discussed. Experimental results reveal that operating conditions have significant infiuences on the properties of PB and the morphologyof PB is closelyrelated to the unit structure of AH gel. The as-prepared PB is characterized byTEM and XRD and compared with those synthesized byconventional Stirred Tank Reactor (STR). Reaction time in RPB shortens for approximatelya half compared with that in STR. It is proven that this route has obvious advantages over STR.
Nano-fibrillar pseudoboehmite, Rotating packed bed, Mass transfer, Mixing, Gels, Morphology
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陈建峰, Jian-Feng Chen a, *, Zhi-Gang Shen a, Fang-Tao Liu a, Xiao-Lin Liu a, Jimmy Yun b
Scripta Materialia 49(2003)509-514,-0001,():
-1年11月30日
Barium titanate powders have been prepared using a low temperature aqueous synthesis method in both conventional batch stirred tank reactor (BSTR) and continuous high-gravity reactive precipitation (HGRP) technique. The powders synthesized with HGRP technique show much smaller average particle size and exhibit higher specific surface area as compared to those prepared by conventional BSTR method.
Barium titanate, Synthesis, High-gravity reactive precipitation, Nanomaterials, Electroceramic
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陈建峰, Dapeng Cao a, b, *, Xianren Zhang a, Jianfeng Chena, Jimmy Yun b
Letters to the Editor/Carbon 41(2003)2653-2689,-0001,():
-1年11月30日
A., Activated carbon, C., Adsorption, Molecular simulation, D., DiffusionA., Activated carbon, C., Adsorption, Molecular simulation, D., Diffusion
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陈建峰, Xianren Zhang, †, Wenchuan Wang, *, Jianfeng Chen, ‡, and Zhigang Shen‡
Langmuir 2003, 19, 6088-6096,-0001,():
-1年11月30日
In this paper the experimental adsorption isotherm and density functional theory (DFT) are used to characterize a sample of single-walled carbon nanotube (SWNT) arrays. Because the adsorption in SWNT arrays is rather complicated, and will occur both inside and outside isolated nanotubes as well as in adsorption sites due to aggregations of nanotubes, it is necessary to introduce adsorption models with different mechanisms. Four adsorption models have been introduced and compared in this work. The pore size distributions, which correspond to the models adopted, are determined by minimizing the deviations between the experimental isotherm and the DFT calculation. Our results indicate that by introducing enough flexibility in model IV proposed, in which adsorption takes place in both the outer surface and inside of the tubes separately or simultaneously, can give a good fit to the experimental isotherm.
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【期刊论文】Synthesis of Nanoparticles with Novel Technology: High-Gravity Reactive Precipitation
陈建峰, Jian-Feng Chen, *, †, Yu-Hong Wang, Fen Guo, Xin-Ming Wang, and Chong Zheng
Ind. Eng. Chem. Res. 2000, 39, 948-954,-0001,():
-1年11月30日
On the basis of the analysis of key engineering factors predominating in a reactive precipitation process, a new method called high-gravity reactive precipitation (HGRP), which means that reactive precipitation takes place in high-gravity conditions, is presented here for the massive production of nanoparticles. A rotating packed-bed reactor was designed to generate acceleration higher than the gravitational acceleration on Earth. The syntheses of nanoparticles of CaCO3, aluminum hydroxide, and SrCO3 were employed to demonstrate the advantages and industrial potentials of this technology, where the typical gas-liquid-solid, gas-liquid, and liquid-liquid multiphase reaction systems were involved. Experimental results show that the mean size of CaCO3 particles can be controlled and adjusted in the range of 17-36nm through the change of operation conditions such as high-gravity levels, fluid flow rates, and reactant concentrations. Nanofibrils of aluminum hydroxide of 1-10nm in diameter and 50-300nm in length as well as nanoparticles of SrCO3 with a mean size of 40nm were synthesized. The crystal structures of these compounds synthesized in high-gravity conditions were the same as those in gravitational conditions. HGRP technology is believed to be capable of the preparation of nanoparticles with low-cost and high-volume production and therefore to have potential applications in industry.
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