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Online since: May 2011
Authors: Sheng Peng Liu, Li Li Xu, Xuan Li
Core-shell Magnesium Hydroxide/Polymermer Nanoparticles Prepared by in-situ Emulsion Copolymerization
Lili Xu1, a, Shengpeng Liu1, b, Xuan Li2, c
1 Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan 430073, China
2School of Chemistry,Huazhong Normal University, Wuhan, 430079, China
axulily00@163.com, bliuabss@163.com, clixuanx@163.com
Keywords: Magnesium hydroxide; Core-shell; in-situ Emulsion copolymerization
Abstract.
The morphology, thermal stability and chemical structure of the final products were investigated in detail with transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier-transform infrared spectra (FTIR).
The TEM results showed that the core-shell structure of MH/Polymer nanoparticles with MH-cores and Polymer-shell was formed.
Later, the chemical structure, morphology and thermal properties of MH/polymer hybrid nanoparticles were examined.
Fourier transform infrared (FTIR) spectroscopy was applied to characterize changes in the chemical structure of vinylated MH and MH/Polymer hybrid particles by VERTEX 70 spectrometer (Bruker, Germany).
The morphology, thermal stability and chemical structure of the final products were investigated in detail with transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier-transform infrared spectra (FTIR).
The TEM results showed that the core-shell structure of MH/Polymer nanoparticles with MH-cores and Polymer-shell was formed.
Later, the chemical structure, morphology and thermal properties of MH/polymer hybrid nanoparticles were examined.
Fourier transform infrared (FTIR) spectroscopy was applied to characterize changes in the chemical structure of vinylated MH and MH/Polymer hybrid particles by VERTEX 70 spectrometer (Bruker, Germany).
Online since: September 2011
Authors: Ri Cha Hu, Li Bo Sun
Currently, heavy metal ion contamination to the soil caused by wastewater irrigation has become one of the focuses in the study of soil chemistry and agricultural environment pollution.
Table 1 Soil depth, monitoring area location, and soil property soil depth [cm] monitoring area location Soil property surface deep structure 15 Xiqiao, Kongjia Township clay sandy 100 180 1.4 Methods of Analysis First of all, samples collected are pretreated by microwave digestion and the specific steps are as follows: weigh 0.5000g dried soil sample through 100 mesh nylon sieve, add it to the polyvinyl chloride crucible and drop1-2d ultra-pure water to make moist , add 8ml mixed acid (HNO3: HClO4 = 5:1), digest at 100 ℃ for12h, then add 8mL HF, heated to solution volume boiling, cook for 4-5h to a paste, add 2mL HNO3 solution (HNO3: H2O = 1:1) to make it fully dissolve and be dissolved to 25mL.
Table 1 Soil depth, monitoring area location, and soil property soil depth [cm] monitoring area location Soil property surface deep structure 15 Xiqiao, Kongjia Township clay sandy 100 180 1.4 Methods of Analysis First of all, samples collected are pretreated by microwave digestion and the specific steps are as follows: weigh 0.5000g dried soil sample through 100 mesh nylon sieve, add it to the polyvinyl chloride crucible and drop1-2d ultra-pure water to make moist , add 8ml mixed acid (HNO3: HClO4 = 5:1), digest at 100 ℃ for12h, then add 8mL HF, heated to solution volume boiling, cook for 4-5h to a paste, add 2mL HNO3 solution (HNO3: H2O = 1:1) to make it fully dissolve and be dissolved to 25mL.
Online since: June 2010
Authors: Min Shou Zhao, Li Zhang
The
structure and electrochemical performances of LiFe1-xNdxPO4 /C(x = 0 - 0.08) have been studied
by XRD, FE-SEM, EIS and galvanostatic charge-discharge.
The cell parameters of LiFe1-xNdxPO4 (x = 0.04 - 0.08) are calculated on Si internal standard, and LiFe1-xNdxPO4/C has the same olivine structure as LiFePO4, and delivers the highest discharge capacity of 165.2 mAh·g −1 at 0.2 C rate and the capacity retention rate is 92.8 % after 100 cycles.
The results suggest that the small amount of Nd 3+ ion-doped does not change the olivine crystal structure of LiFePO4.
In addition, carbon diffraction peak is not been observed in Fig.2, which implies that the carbon coating does not affect the crystal structure of LiFePO4 also.
The structure of LiFePO4 may be destroyed at high discharge current density, which seriously influences the charge-discharge efficiency and reversibility.
The cell parameters of LiFe1-xNdxPO4 (x = 0.04 - 0.08) are calculated on Si internal standard, and LiFe1-xNdxPO4/C has the same olivine structure as LiFePO4, and delivers the highest discharge capacity of 165.2 mAh·g −1 at 0.2 C rate and the capacity retention rate is 92.8 % after 100 cycles.
The results suggest that the small amount of Nd 3+ ion-doped does not change the olivine crystal structure of LiFePO4.
In addition, carbon diffraction peak is not been observed in Fig.2, which implies that the carbon coating does not affect the crystal structure of LiFePO4 also.
The structure of LiFePO4 may be destroyed at high discharge current density, which seriously influences the charge-discharge efficiency and reversibility.
Online since: June 2008
Authors: Norberto Roveri, Lia Rimondini, Elisa Battistella, Ismaela Foltran, Elisabetta Foresti, Marco Lelli, Barbara Palazzo, Michele Iafisco
Rimondini2,h
1Dept. of Chemistry "G.
Synthesized CHA mimic for composition, structure, nano dimension and morphology bone apatite crystals and their chemical-physical properties resemble closely those exhibited by enamel natural apatite.
They are due to the action of acids able to solubilize the tooth mineral structures [1-3].
Actually the both interprismatic and prismatic enamel structures appear still evident.
On the contrary after treatment of the enamel slabs with CHA the interprismatic and prismatic enamel structures appear to be completely hidden by a thick homogeneous apatitic layer (Fig. 5a).
Synthesized CHA mimic for composition, structure, nano dimension and morphology bone apatite crystals and their chemical-physical properties resemble closely those exhibited by enamel natural apatite.
They are due to the action of acids able to solubilize the tooth mineral structures [1-3].
Actually the both interprismatic and prismatic enamel structures appear still evident.
On the contrary after treatment of the enamel slabs with CHA the interprismatic and prismatic enamel structures appear to be completely hidden by a thick homogeneous apatitic layer (Fig. 5a).
Online since: June 2019
Authors: Xiu Hua Yuan, Qi Li
A lot of research shows that D-π-A structure usually exhibits large NLO response.
The results show that compounds holding D-π-A structure exhibits a large NLO response.
The structure of system 1-4 are shown in Fig. 1 Fig.1.
We explained how the molecular structure improved the value.
Journal of Computational Chemistry, 2010, 26(15):1543-1564.
The results show that compounds holding D-π-A structure exhibits a large NLO response.
The structure of system 1-4 are shown in Fig. 1 Fig.1.
We explained how the molecular structure improved the value.
Journal of Computational Chemistry, 2010, 26(15):1543-1564.
Online since: May 2023
Authors: Ahmad A. Aabid, Mohmmed Abdullah Sanam, Liqaa I. Saeed, Abdullah H. Ibrahim, Jasim Ibrahim Humadi, Omer Haitham Kanam, Maher Obaid Ahmed
., non-homogeneous) flow structures, and the flow structure of the bubble columns changes as the gas surface velocity increases [2].
Industrial & Engineering Chemistry Research, 2013. 52(24): p. 8091-8108
Industrial & Engineering Chemistry Research, 2009. 48(1): p. 330-340
Industrial & engineering chemistry research, 2009. 48(17): p. 8134-8147
Industrial & Engineering Chemistry Research, 2014. 53(37): p. 14526-14543
Industrial & Engineering Chemistry Research, 2013. 52(24): p. 8091-8108
Industrial & Engineering Chemistry Research, 2009. 48(1): p. 330-340
Industrial & engineering chemistry research, 2009. 48(17): p. 8134-8147
Industrial & Engineering Chemistry Research, 2014. 53(37): p. 14526-14543
Online since: June 2007
Authors: Seung Gu Kang, Yoo Taek Kim, Jung Hwan Kim, Gi Gang Lee, Hwan Sik Kim
Especially, the glass-ceramics containing dust 60 wt%
showed a heavy metal leaching concentration of 66 % Pb, 60 % Zn and 98 % Fe lower than that of
glass specimens due to crystal phases formed, thermodynamically more stable than a glass network
structure.
The heavy metal in glass-ceramics stable due to crystal phases formed, thermodynamically more stable than a glass network structure.
The heavy metals in glass-ceramics were more stable than in a glass network structure and willemite crystal phase showed weaker corrosion resistance than spinel crystal phase.
Leaching concentration of each specimen, therefore, strongly depended upon kind of phase structure present.
Bright Wilson, Jr, in: Handbook of Chemistry and Physics 74 Edition, edited by CRC Press, USA (1993), in press.
The heavy metal in glass-ceramics stable due to crystal phases formed, thermodynamically more stable than a glass network structure.
The heavy metals in glass-ceramics were more stable than in a glass network structure and willemite crystal phase showed weaker corrosion resistance than spinel crystal phase.
Leaching concentration of each specimen, therefore, strongly depended upon kind of phase structure present.
Bright Wilson, Jr, in: Handbook of Chemistry and Physics 74 Edition, edited by CRC Press, USA (1993), in press.
Online since: February 2011
Authors: Jie Ren, Guang Fen Zhou
The surface reactions in ALD of HfO2 and ZrO2 show large similarities in energetics and geometrical structures.
The molecular structure of TS for R1 is represented by the dashed line in Fig. 3.
The structures are shown using R1 as the example. (1) Reactants, (2) chemisorbed state , (3) transition state, (4) physisorbed state and (5) desorption state.
Due to the similar ionic size and chemistry of hafnium and zirconium, the Hf- and Zr-based surface reactions show large similarities in energetics and geometrical structures.
Firstly, the surface reactions in ALD of HfO2, ZrO2 show large similarities in energetics and geometrical structures.
The molecular structure of TS for R1 is represented by the dashed line in Fig. 3.
The structures are shown using R1 as the example. (1) Reactants, (2) chemisorbed state , (3) transition state, (4) physisorbed state and (5) desorption state.
Due to the similar ionic size and chemistry of hafnium and zirconium, the Hf- and Zr-based surface reactions show large similarities in energetics and geometrical structures.
Firstly, the surface reactions in ALD of HfO2, ZrO2 show large similarities in energetics and geometrical structures.
Organic Functionalization and Properties of ZnO Nanosheets with Polymer Containing N-Vinyl Carbazole
Online since: June 2017
Authors: Xing Fa Ma, Xin Tao Zhang, Jian Xun Qiu, Shi Sheng Lv, Lin Bian, Ming Jun Gao, Xiao Chun He, Guang Li
Among the modified methods for ZnO nano/micro-structures, synthesis of core/shell structured ZnO based nanocomposites is more attractive because of nanocomposites have combination properties of core and shell materials.
Myoung, High-performance flexible ZnO nanorod UV photodetectors with a network-structured Cu nanowire electrode, Nanoscale, 8(2016) 16677–16683
Jurg, Synthesis, structure, EPR studies and upconversion luminescence of ZnO:Er3+–Yb3+@Gd2O3 nanostructures, RSC Adv.6(2016)89305–89312
Li; Organic/inorganic nanocomposites of ZnO/CuO/chitosan with improved properties, Materials Chemistry and Physics.178(2016)88-97
Bai, Preparation of Polyaniline-TiO2 Composite Film with in-situ Polymerization Approach and Its Gas-sensitivity at Room Temperature, Materials Chemistry and Physics.98(2006)241-247
Myoung, High-performance flexible ZnO nanorod UV photodetectors with a network-structured Cu nanowire electrode, Nanoscale, 8(2016) 16677–16683
Jurg, Synthesis, structure, EPR studies and upconversion luminescence of ZnO:Er3+–Yb3+@Gd2O3 nanostructures, RSC Adv.6(2016)89305–89312
Li; Organic/inorganic nanocomposites of ZnO/CuO/chitosan with improved properties, Materials Chemistry and Physics.178(2016)88-97
Bai, Preparation of Polyaniline-TiO2 Composite Film with in-situ Polymerization Approach and Its Gas-sensitivity at Room Temperature, Materials Chemistry and Physics.98(2006)241-247
Online since: November 2011
Authors: Xin Liu
The structure, configuration and fabrication steps were described.
Gas sensor structure and fabrication The gas sensor has the advantages of small volume and low power, which was fabricated by MEMS technology.
KOH etching was performed to form the thermally isolated structure.
CuPc has a micro ring conjugated structure and the transition energy of the π electron is small.
Journal of American Chemistry Society, 2003, vol.125, pp 9930–9931 [5] LI Ke, YU Shi-jie, YOU Zheng, ZHAO Jia-hao, “Transducer and Microsystem Technologies”, Transducer and Microsystem Technologies, 2008, pp. 5–7 [6] Ji Zhengguo, Xiang Yin, Zhu Ling, Wang Longcheng, Rui Xiangxin, “Enhancing Selectivity of Sensor by the Gas Sensor Made of Lead Phthalocyanine and Its Transient Response”, Vacuum Electronics, 2002, pp.30–32
Gas sensor structure and fabrication The gas sensor has the advantages of small volume and low power, which was fabricated by MEMS technology.
KOH etching was performed to form the thermally isolated structure.
CuPc has a micro ring conjugated structure and the transition energy of the π electron is small.
Journal of American Chemistry Society, 2003, vol.125, pp 9930–9931 [5] LI Ke, YU Shi-jie, YOU Zheng, ZHAO Jia-hao, “Transducer and Microsystem Technologies”, Transducer and Microsystem Technologies, 2008, pp. 5–7 [6] Ji Zhengguo, Xiang Yin, Zhu Ling, Wang Longcheng, Rui Xiangxin, “Enhancing Selectivity of Sensor by the Gas Sensor Made of Lead Phthalocyanine and Its Transient Response”, Vacuum Electronics, 2002, pp.30–32