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Online since: March 2017
Authors: Ying Jie Cai, Asfandyar Khan, Muhammad Asad Saleem, Rashid Masood, Md. Nahid Pervez
Nahid Pervez1, 2, b, Muhammad Asad Saleem1, c, Rashid Masood3, d, Yingjie Cai1, 4, e*
1School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430073, China
2Research Institute of Flexible Materials, School of Textiles & Design, Heriot-Watt University, Galashiels TD1 3HF, UK
3Department of Textile Processing, National Textile University, Faisalabad 37610, Pakistan
4Hubei Provincial Engineering Laboratory for Clean Production and High Value Utilization
of Bio-Based Textile Materials, Wuhan Textile University, Wuhan 430073, China
aasfandyarkhan100@gmail.com, bmp58@hw.ac.uk, casadsaleem92@yahoo.com,
drashid@ntu.edu.pk, eyingjiecai@wtu.edu.cn
Keywords: SSMePCM, in-situ polymerization, Biodegradable, Thermal energy, Latent heat
Abstract.
The morphology, chemical structure and thermal properties were characterized by optical microscopy (OM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC).
A broad endothermic peak between ambient temperature and 100ºC is seen in all curves due to water evaporation from microcapsules structures.
New Approach of Phase Change Material Encapsulation through in situ Polymerization to Improve Thermo-Regulating Property of Cellulose, Asian Journal of Chemistry. 28 (2016) 1191
The morphology, chemical structure and thermal properties were characterized by optical microscopy (OM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC).
A broad endothermic peak between ambient temperature and 100ºC is seen in all curves due to water evaporation from microcapsules structures.
New Approach of Phase Change Material Encapsulation through in situ Polymerization to Improve Thermo-Regulating Property of Cellulose, Asian Journal of Chemistry. 28 (2016) 1191
Online since: October 2006
Authors: Jana Mikulová, Jacques Barbier Jr., Daniel Duprez, Sylvie Rossignol, Charles Kappenstein
Catalysts for Wet Air Oxidation Based on Ce-Zr-Pr-O Mixed Oxides
Prepared by Soft Chemistry
J.
Structure of Pr6O11 is fluorite type and the ionic radius of Pr4+ ions is close to that of Ce4+ ions.
In previous studies it was found that thermally stable Zr0.1(Ce1-xPrx)0.9O2 mixed oxides (x between 0 and 0.75) prepared by sol-gel present a fluorite-type structure [12].
All final oxides present the same fluorite type structure (Fig 3a, 3c).
Metal addition enhances the oxygen transfer on the catalytic support lattice especially when Zr and Pr are added in the ceria structure.
Structure of Pr6O11 is fluorite type and the ionic radius of Pr4+ ions is close to that of Ce4+ ions.
In previous studies it was found that thermally stable Zr0.1(Ce1-xPrx)0.9O2 mixed oxides (x between 0 and 0.75) prepared by sol-gel present a fluorite-type structure [12].
All final oxides present the same fluorite type structure (Fig 3a, 3c).
Metal addition enhances the oxygen transfer on the catalytic support lattice especially when Zr and Pr are added in the ceria structure.
Online since: October 2010
Authors: Xue Mei Li
Moreover, the various adjustable parameters were adopted in the previous treatments [9], and the EPR analysis was not correlated to the local structure of the defect center either.
Considering that information about the local structure (low symmetrical distortion) arising from the Jahn-Teller distortion would be helpful to the understandings of the defect and impurity behaviours in crystals, the EPR spectra and the local structure for Ni+ in MgO should be worthy of further theoretical investigations.
So, the local structure of this impurity center can be conveniently described as the relative elongation DZ.
So, the g factors are correlated to the tetragonal field parameters and hence the local structure of the impurity center.
Weast: CRC Handbook of Chemistry and Physics (CRC Press, Boca Raton, 1989) p.
Considering that information about the local structure (low symmetrical distortion) arising from the Jahn-Teller distortion would be helpful to the understandings of the defect and impurity behaviours in crystals, the EPR spectra and the local structure for Ni+ in MgO should be worthy of further theoretical investigations.
So, the local structure of this impurity center can be conveniently described as the relative elongation DZ.
So, the g factors are correlated to the tetragonal field parameters and hence the local structure of the impurity center.
Weast: CRC Handbook of Chemistry and Physics (CRC Press, Boca Raton, 1989) p.
Online since: October 2012
Authors: Qiao Yun Zhang, Jin Shui Mo, Guang Xia Zhang
Study of Microwave Synthesis of 2 - Hydroxy phosphono acetic acid process
Zhang Qiao-Yun, Mo Jin-Shui and Zhang Guang-Xia
Chemistry and Material Science Institute of Langfang Teachers College, Langfang, Hebei, 065000,China
zhangqy810@sina.com
Keywords: phosphorous acid, glyoxylate, 2-hydroxy phosphono acetic acid, microwave synthesis, water treatment agent
Abstract: This research introduced microwave synthesis process of HPAA (2-hydroxyphosphonoacetic acid) which was synthesized from glyoxylate and phosphorous acid.
The molecular structure of product was characterized by IR spectrogram analysis.
Compared with other organic phosphonic acid, HPAA molecular structure had more a carboxyl group, so it had corrosion and scale inhibition function [1,2].
diluted with water to the mark, shaken, placed at room temperature for 10min, colored stable, Absorbance measured by spectrophotometer at 710nm wavelength. 1.3.5 determination of phosphorous content[4] Piped 25.00mL test solution A in a 250mL volumetric flask, adjusted with sodium hydroxide solution (40.0g/L) to pH 6-7, added 12.0mL saturated solution of five boric acid ammonium, piped 25.00mL iodine standard solution (0.1mol/L), covered the cork and placed in the dark for 15 min, added 15mL sulfuric acid solution (250mL/L), titrated it by standard solution of sodium thiosulfate (0.1 mol/L) to a pale yellow, added starch indicator agent, continued the titration to the disappearance of the blue was the end of, at the same time, distilled water instead of test solution A by adding the same reagent blank test, do the same steps. 1.3.6 infrared spectroscopy Through Prestige -21 Fourier transform infrared spectrometer obtained the characterization of the product, and thus the molecular structure
The molecular structure of product was characterized by IR spectrogram analysis.
Compared with other organic phosphonic acid, HPAA molecular structure had more a carboxyl group, so it had corrosion and scale inhibition function [1,2].
diluted with water to the mark, shaken, placed at room temperature for 10min, colored stable, Absorbance measured by spectrophotometer at 710nm wavelength. 1.3.5 determination of phosphorous content[4] Piped 25.00mL test solution A in a 250mL volumetric flask, adjusted with sodium hydroxide solution (40.0g/L) to pH 6-7, added 12.0mL saturated solution of five boric acid ammonium, piped 25.00mL iodine standard solution (0.1mol/L), covered the cork and placed in the dark for 15 min, added 15mL sulfuric acid solution (250mL/L), titrated it by standard solution of sodium thiosulfate (0.1 mol/L) to a pale yellow, added starch indicator agent, continued the titration to the disappearance of the blue was the end of, at the same time, distilled water instead of test solution A by adding the same reagent blank test, do the same steps. 1.3.6 infrared spectroscopy Through Prestige -21 Fourier transform infrared spectrometer obtained the characterization of the product, and thus the molecular structure
Online since: October 2024
Authors: Irshad Ali, Shanza Rehan, Haleema Sadia, Lyba Siddiqui
Fig. 1 (a) Device structure (b) Band alignment (c) energy band diagram.
Our proposed cell has n-i-p planner structure as shown in fig. 1a.
Shao et al., Recent progress in perovskite solar cells: material science, Science China Chemistry, vol. 66, no. 1.
Zhu, Solution chemistry engineering toward high-efficiency perovskite solar cells, J.
Rong et al., Materials Design Rules for Multivalent Ion Mobility in Intercalation Structures, Chem.
Our proposed cell has n-i-p planner structure as shown in fig. 1a.
Shao et al., Recent progress in perovskite solar cells: material science, Science China Chemistry, vol. 66, no. 1.
Zhu, Solution chemistry engineering toward high-efficiency perovskite solar cells, J.
Rong et al., Materials Design Rules for Multivalent Ion Mobility in Intercalation Structures, Chem.
Online since: January 2007
Authors: Robert Ruprecht, Jürgen Haußelt, Volker Piotter, G. Finnah, B. Zeep
To overcome the lack of micro manufacturing processes suitable for medium and large
scale production as well as to process high resistive materials a special variant of micro injection
molding is currently under development: micro powder injection molding (MicroPIM), which
already enables the manufacturing of finest detailed components with structure sizes down to a few
ten micrometer.
Steels (316L, 17-4PH), iron, copper Tungsten carbide Tungsten and tungsten alloys Typical binder systems Polyolefine/wax (+additives) Polyacetal sytems Tool evacuation Required if "classical"venting is not possible Temperature control Isothermal, (variothermal for high AR) Typical cycle time 15s (isothermal) - 8min (maximum for variothermal) Tested mould insert materials Steel, brass, nickel, (ceramics) Machinery equipment Standard industrial units with certain modifications for feedstock processing Smallest structural detail molded < 2µm Highest aspect ratio reached so far: - free structure (pin, web) - sunk structure (hole, channel) 10 (ceramic) > 15 (nearly all kinds of powders) In addition to standard materials, tungsten has been used for powder injection molding.
Slot array test structure on substrate plate for future use in fusion technology (green body, right).
Schubert, Tungsten: Properties, Chemistry, Technology of the Element, Alloys and Chemical Compounds, pp 7-42, 1999, Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow
Steels (316L, 17-4PH), iron, copper Tungsten carbide Tungsten and tungsten alloys Typical binder systems Polyolefine/wax (+additives) Polyacetal sytems Tool evacuation Required if "classical"venting is not possible Temperature control Isothermal, (variothermal for high AR) Typical cycle time 15s (isothermal) - 8min (maximum for variothermal) Tested mould insert materials Steel, brass, nickel, (ceramics) Machinery equipment Standard industrial units with certain modifications for feedstock processing Smallest structural detail molded < 2µm Highest aspect ratio reached so far: - free structure (pin, web) - sunk structure (hole, channel) 10 (ceramic) > 15 (nearly all kinds of powders) In addition to standard materials, tungsten has been used for powder injection molding.
Slot array test structure on substrate plate for future use in fusion technology (green body, right).
Schubert, Tungsten: Properties, Chemistry, Technology of the Element, Alloys and Chemical Compounds, pp 7-42, 1999, Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow
Online since: August 2009
Authors: Hai Tao Liu, Yong Qiang Zhou, Zhen Hong Sheng, Chun Lian Wu, Jing Feng Zhang, Shie Lin, Xue Jun Weng
N-(n-butyl)-3-aminopropyltrimethoxysilane-functional modified
pyrophyllite: preparation, characterisation and Pb(II) ion adsorption
property
Liu Haitao1,a
, Zhou Yongqiang1, Sheng Zhenhong2 , Wu Chunlian1 ,
Zhang Jingfeng1 , Lin Shie3 , Weng Xuejun4
1
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou , 325035 P.R.
It can be clearly observed that the pyrophyllite looses its aculeated surface structure and gains more smooth morphology.
It seems that the structure of pyrophyllite is not changed because original peak positions of pyrophyllite are not changed after the surface modification.
The structure of pyrophyllite is not changed because original peak positions of pyrophyllite are not changed after the surface modification.
It can be clearly observed that the pyrophyllite looses its aculeated surface structure and gains more smooth morphology.
It can be clearly observed that the pyrophyllite looses its aculeated surface structure and gains more smooth morphology.
It seems that the structure of pyrophyllite is not changed because original peak positions of pyrophyllite are not changed after the surface modification.
The structure of pyrophyllite is not changed because original peak positions of pyrophyllite are not changed after the surface modification.
It can be clearly observed that the pyrophyllite looses its aculeated surface structure and gains more smooth morphology.
Online since: July 2011
Authors: Yan Jun Zhou, Hui Ling Du, Jin Gang Qi, Jian Zhong Wang, Ai Min Liu
Scanning electron microscopy (SEM) images and X-ray powder diffraction (XRD) were used to characterize morphologies and phase structures of the cobalt oxalate powders.
Introduction The morphology of powders is controlled by growth mechanism and interaction between grains in the process of powders preparation by hydro-chemistry method.
It can be seen from the above studies that the phase structure of sample 1 and that of sample 2 is the same, and the morphology of products is very different.
The transition of bonding way results in the structure changes of growth matrix.
X-ray powder diffraction (XRD) analysis reveal that the phase structures of the produces prepared with and without PEMF are in concordance.
Introduction The morphology of powders is controlled by growth mechanism and interaction between grains in the process of powders preparation by hydro-chemistry method.
It can be seen from the above studies that the phase structure of sample 1 and that of sample 2 is the same, and the morphology of products is very different.
The transition of bonding way results in the structure changes of growth matrix.
X-ray powder diffraction (XRD) analysis reveal that the phase structures of the produces prepared with and without PEMF are in concordance.
Online since: September 2012
Authors: Ying Hua Gao, Shui Li Lai
Preparation, characterization of Organo-montmorillonite under Focused Signal-Mode Microwave Irradiation
Lai Shuili1,a, Gao Yinghua1,b
1Key Laboratory of Auxiliary Chemistry & technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China;
alsl25206@163.com, bgaoyinghua1984@126.com,
Keywords: focused signal-mode microwave irradiation; montmorillonite; organo-montmorillonite; cetyltrimethylammonium bromide;
Abstract.
The structure of the montmorillonite was characterized by X-ray diffraction (XRD), infrared spectrum (IR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM).
Due to the well-defined layered structure, Na+-MMT shows a diffraction peak is clearly evident at at 2θ = 7.160°, according to calculations, the distance between lattice layers (d001) is 1.234 nm.
Obviously, it can be seen from the Fig. 4(a) the morphology of untreated MMT is compact layered grains, the surface is flat and structured, there is no crimped in the end face.
However, it can be seen from the Fig. 4(b), the morphology of organo-modification montmorillonite is completely stripping, the layered clay structure of OMMT can be clearly observed.
The structure of the montmorillonite was characterized by X-ray diffraction (XRD), infrared spectrum (IR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM).
Due to the well-defined layered structure, Na+-MMT shows a diffraction peak is clearly evident at at 2θ = 7.160°, according to calculations, the distance between lattice layers (d001) is 1.234 nm.
Obviously, it can be seen from the Fig. 4(a) the morphology of untreated MMT is compact layered grains, the surface is flat and structured, there is no crimped in the end face.
However, it can be seen from the Fig. 4(b), the morphology of organo-modification montmorillonite is completely stripping, the layered clay structure of OMMT can be clearly observed.
Online since: March 2010
Authors: Yu Feng Chen, Hua Wang, Hai Lin Liu, Jie Tang, Chun Peng Wang, Yan Li Huo
The results indicated the flexural strength of green body was up to 8MPa and the micro-
structures were homogeneous.
This process is based on traditional forming method and polymer chemistry.
The micro- structure of the green body was also examined.
When the monomer ratio increased, the gel network structure of cross-linked polymer gel became more elastic, so the flexural strength of green body increased.
On the other hand, when the monomer ratio was too high, the gel network structure was coarse, which lead to decreasing of the flexural strength.
This process is based on traditional forming method and polymer chemistry.
The micro- structure of the green body was also examined.
When the monomer ratio increased, the gel network structure of cross-linked polymer gel became more elastic, so the flexural strength of green body increased.
On the other hand, when the monomer ratio was too high, the gel network structure was coarse, which lead to decreasing of the flexural strength.