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Online since: January 2010
Authors: Surin Saipanya, Thapanee Sarakonsri
Preparation and Applications of Precious Metals Adsorbed Activated
Carbon Cloth
Surin Saipanya1,a and Thapanee Sarakonsri2,b
Department of Chemistry, Chiang Mai University, Chiang Mai 50200, Thailand
a
saipanya@chiangmai.ac.th and
bscchi017@chiangmai.ac.th
Keywords: Precious metal, activated carbon cloths (ACCs) and cyclic voltametry (CV)
Abstract.
It has also been used as a support for catalysts utilized in heterogeneous catalysis as its porous structure leading to large internal surface area per unit weight for chemical reaction.
Macro physical structures of ACCs are maintained after acid treatment as shown in Fig.1.
It can also be noticed that the ACCs are very smooth, long and high network structures which can be attributed to be a favorable host for metal nanoparticles.
It has also been used as a support for catalysts utilized in heterogeneous catalysis as its porous structure leading to large internal surface area per unit weight for chemical reaction.
Macro physical structures of ACCs are maintained after acid treatment as shown in Fig.1.
It can also be noticed that the ACCs are very smooth, long and high network structures which can be attributed to be a favorable host for metal nanoparticles.
Online since: July 2017
Authors: Danieli Aparecida Pereira Reis, J.M.K. Assis, Francisco Piorino Neto, A.M. Mello, Renata Jesuina Takahashi
Its chemistry and microstructure influence durability through the structure and morphology of TGO created as it oxidizes [4].
The poor densification were observed of samples sintered at 800 oC and 900 oC, but at 900 oC was possible to note the formed structures like chromium rich phases, nickel rich phases and nickel and chromium phases, both with aluminium in minor amounts.
The similar structures is presented at Fig. 4-c and 4-d were encountered only in those two samples, however at 1100 oC was observed the phase with nickel and aluminium which was not present at 1000 oC, but at 1150 oC.
The poor densification were observed of samples sintered at 800 oC and 900 oC, but at 900 oC was possible to note the formed structures like chromium rich phases, nickel rich phases and nickel and chromium phases, both with aluminium in minor amounts.
The similar structures is presented at Fig. 4-c and 4-d were encountered only in those two samples, however at 1100 oC was observed the phase with nickel and aluminium which was not present at 1000 oC, but at 1150 oC.
Online since: June 2013
Authors: Li Yu, Guo Bin Duan, Yong Kui Huang, Shui Jin Yang
Photocatalytic Degradation of Methyl Violet with H3PW6Mo6O40/SiO2 Sensitized by H2O2
Guobin DUANa, Yongkui HUANGb, Li YUc, Shuijin YANG*d
College of Chemistry and Environmental Engineering, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Hubei Normal University, Huangshi 435002, China
aduangb1987@126.com, bxiaohuang2118@163.com, cyulisunshine@163.com, dyangshuijin@163.com
Key words: Polyoxometalates; support; SiO2; photocatalytic degradation; methyl violet
Abstract: H3PW6Mo6O40/SiO2 was prepared by sol-gel method, and sensitized by H2O2 solution.
Another problem of POMs catalysts used to degrade pollutants in homogeneous systems is that they are difficult to separate from the reaction system at the end of the reaction.So, POMs should be supported on a support to improve the catalytic performance in the reaction[8].SiO2 was an ideal support because of higher surface area, chemical inertness, controlled porosity and well disperses for POMs while retaining the structure.
For the FT-IR, pure H3PW6Mo6O40 gives peaks due to the Keggin structure at 1077cm-1, 975cm-1, 878cm-1, 783cm-1 and 513cm-1.
The characteristic diffraction peaks of H3PW6Mo6O40 at 8.08°, 8.79º, 10.34º, 25.55º, 29.30º, 28.05º and 34.65º can be assigned to the diffraction characteristic peaks of crystalline H3PW6Mo6O40 Keggin structure.
Another problem of POMs catalysts used to degrade pollutants in homogeneous systems is that they are difficult to separate from the reaction system at the end of the reaction.So, POMs should be supported on a support to improve the catalytic performance in the reaction[8].SiO2 was an ideal support because of higher surface area, chemical inertness, controlled porosity and well disperses for POMs while retaining the structure.
For the FT-IR, pure H3PW6Mo6O40 gives peaks due to the Keggin structure at 1077cm-1, 975cm-1, 878cm-1, 783cm-1 and 513cm-1.
The characteristic diffraction peaks of H3PW6Mo6O40 at 8.08°, 8.79º, 10.34º, 25.55º, 29.30º, 28.05º and 34.65º can be assigned to the diffraction characteristic peaks of crystalline H3PW6Mo6O40 Keggin structure.
Online since: February 2011
Authors: Zhi Mao Yang, Hitoshi Takagi, Ke Liu
However, to our best knowledge, there has not been any report about the effect of hollow structure on the thermal conductivity of natural fiber-polymer composite.
The hollow structure makes them suitable for thermal insulation.
Ideally, real experiment would be employed for this task; however, this is often complicated, because relatively complex thermal conductivity measurement limits the accuracy and it is very difficult to check effects of each variable individually, such as the structure and composition.
Peters: The chemistry of fibers (Elsevier, Amsterdam/London/New York 1963)
The hollow structure makes them suitable for thermal insulation.
Ideally, real experiment would be employed for this task; however, this is often complicated, because relatively complex thermal conductivity measurement limits the accuracy and it is very difficult to check effects of each variable individually, such as the structure and composition.
Peters: The chemistry of fibers (Elsevier, Amsterdam/London/New York 1963)
Online since: October 2014
Authors: Suttichai Assabumrungrat, Tawatchai Charinpanitkul, Kreangkrai Maneeintr, Pattara Boonpipattanapong
Table 1 presents the molecular structures of alkanolamines including 2-(diethylamino)ethanol (DEAE), which is investigated by some researchers as a potential absorbent [3,4].
Table 1 Molecular structures of alkanolamines Name Abbreviation Molecular structure Monoethanolamine MEA Diethanolamine DEA 2-Amino-2-Methyl-1-Propanol AMP Methyldiethanolamine MDEA 2-(Diethylamino)ethanol DEAE Experiment For chemicals, MEA is purchased from the Sigma Aldrich (99%) and DEAE is obtained from Merck 99.9+%).
Onoda, CO2 capture by tertiary amine absorbents: a performance comparison study, Industrial & Engineering Chemistry Research. 52 (2013) 8323-8331
Table 1 Molecular structures of alkanolamines Name Abbreviation Molecular structure Monoethanolamine MEA Diethanolamine DEA 2-Amino-2-Methyl-1-Propanol AMP Methyldiethanolamine MDEA 2-(Diethylamino)ethanol DEAE Experiment For chemicals, MEA is purchased from the Sigma Aldrich (99%) and DEAE is obtained from Merck 99.9+%).
Onoda, CO2 capture by tertiary amine absorbents: a performance comparison study, Industrial & Engineering Chemistry Research. 52 (2013) 8323-8331
Online since: May 2013
Authors: Chang Rui Zhang, Yong Tian, Quan Wen
This technology can be applied so as to protect the main structure, to reduce the structural internal temperature stress, to enhance wall waterproof performance, to extend the building’s life, to prevent condensation on indoor wall in cold weather, to sustain the normal life of the residents when reconstructing the buildings, and to remain more housing use area than using internal thermal insulation [2].
All the item indexes of energy-saving design for exterior retaining structure in this project comply with the latest requirements of “Green Architecture Standard of Sino-Singapore Tianjin Eco-City” and “Energy-saving Design Standard of Tianjin Public Architecture” (DB29-153-2010).
Solar battery array is equipped in the form of rack type structure.
[3] Li Baizhan, An Introduction to Green Architecture, Beijing: Chemistry Industry Publishing Company ,2007.09
All the item indexes of energy-saving design for exterior retaining structure in this project comply with the latest requirements of “Green Architecture Standard of Sino-Singapore Tianjin Eco-City” and “Energy-saving Design Standard of Tianjin Public Architecture” (DB29-153-2010).
Solar battery array is equipped in the form of rack type structure.
[3] Li Baizhan, An Introduction to Green Architecture, Beijing: Chemistry Industry Publishing Company ,2007.09
Online since: March 2017
Authors: Wan Mohd Hanif Wan Ya'acob, Nur Amira Mamat Razali, Fauziah Abdul Aziz, Rusaini Athirah Ahmad Rusdi
In the cell wall structures of vegetable plants, these cellulose nanocrystals is joined together by amorphous holocellulose parts to form cellulose micro/nano fibres (CMNF) that found the individual cellulose fibers [2].
After having treated with acid and alkali process, traces insoluble lignin can still found in their structure as evidence in brownish colour.
Robert, Paper Chemistry, Blackie Academic and Profesional, McGrawHill, Glasgow, 1991
Zain, Conversion of lignocellulosic biomass to nanocellulose: structure and chemical process, Scientific World Journal, 2014 (2014) 1-20.
After having treated with acid and alkali process, traces insoluble lignin can still found in their structure as evidence in brownish colour.
Robert, Paper Chemistry, Blackie Academic and Profesional, McGrawHill, Glasgow, 1991
Zain, Conversion of lignocellulosic biomass to nanocellulose: structure and chemical process, Scientific World Journal, 2014 (2014) 1-20.
Online since: October 2007
Authors: Eric Fleury, Yu Chan Kim, Oh Jib Kwon, Jin Ju Lee, Young-Kook Lee
Introduction
Although many alloy systems can form rods of at least 10 mm diameter with a fully amorphous
structure, the design of ferromagnetic Fe-based bulk metallic glass (BMG) is still a challenge.
The replacement of only 1 at.% of Co (Goldschmidt atomic radius, rCo = 1.25 Å and heat of mixing ∆HFe-Co = -1 kJ/mol) by Al (rAl = 1.43 Å, ∆HFe-Al = -11 kJ/mol) enabled the formation of 4 mm diameter rod of fully amorphous structure.
Summary The partial replacement of Co in the Fe52Co20B20Si4Nb4 alloy by elements of different size, electronic structure and heat of mixing with the major element resulted in modifications of the GFA, magnetic and mechanical properties.
Kissinger: Analytical Chemistry Vol. 29 (1957), p. 1702.
The replacement of only 1 at.% of Co (Goldschmidt atomic radius, rCo = 1.25 Å and heat of mixing ∆HFe-Co = -1 kJ/mol) by Al (rAl = 1.43 Å, ∆HFe-Al = -11 kJ/mol) enabled the formation of 4 mm diameter rod of fully amorphous structure.
Summary The partial replacement of Co in the Fe52Co20B20Si4Nb4 alloy by elements of different size, electronic structure and heat of mixing with the major element resulted in modifications of the GFA, magnetic and mechanical properties.
Kissinger: Analytical Chemistry Vol. 29 (1957), p. 1702.
Online since: March 2013
Authors: Yong Zai Wang, Shao Hui Luo, Ying Fu
Smaller nanorods aggregate heavily with each other to form the interconnected structure.
Acknowledgements This work was supported by the Science Foundation of Shandong Province (2008E24) and Open Foundation of Research and Testing Base for Structure and Composition of Inorganic Materials of Shandong Province (2011SIM-4) References [1] L.L.
Elliott, Structure and Chemistry of the Apatites and Other Calcium Orthophosphates, Elsevier Science, The Netherlands, 1994
Acknowledgements This work was supported by the Science Foundation of Shandong Province (2008E24) and Open Foundation of Research and Testing Base for Structure and Composition of Inorganic Materials of Shandong Province (2011SIM-4) References [1] L.L.
Elliott, Structure and Chemistry of the Apatites and Other Calcium Orthophosphates, Elsevier Science, The Netherlands, 1994
Online since: July 2014
Authors: Li Jiang Hu, De Rong Lin
In Situ Formation ofInsect Repellent Delivery System
Derong LIN1,a, Lijiang HU2,b
1School of Food Science, Sichuan Agricultural University, Ya’an, 625014, China
2Department of Chemistry, Harbin Institute of Technology, Box 713, Harbin,150001, China
aemail:youngsumass@126.com,bemail:hulijiang2008@126.com
Keywords: Silsesquioxane; Insect repellant (Citral); Polymerization; Polymer delivery system
Abstract.
This range correspond to VS oligomers, and the proposed structural formulas corresponding to the peaks data were assigned with the generic formula (RSiO1.5)n (n = even number≥6; complete cage structure) or [RSiO1.5–(x+y)/2n]n(OH)x(OCH3)y (n = 4, 5, 6...; x, y = 1, 2, 3...; incomplete cage, ladder and branchedlinear structures)(as seen inTable 1)[10].These peaks data have excellent compliance between the experimental measurement value (m/z) and the calculated molecular weight according to ion adducts (M + H+) [11].
Assigned structure M/Z (pre.) 915.2 T10(OH)(OCH3)5H+ 915.0 969.2 T10(OH)7(OMe)5H+ 970.5 985.2 T10(OH)6(OMe)6H+ 983.1 1013.2 T11(OH)11(OMe)2H+ 1014.2 1029.2 T11(OH)10(OMe)3H+ 1029.0 1073.2 T12(OH)(OMe)5H+ 1073.0 1101.2 T12(OH)11(OMe)2H+ 1103.0 1117.2 T12(OH)8(OMe)3H+ 1117.0 1145.2 T12(OH)8(OMe)5H+ 1145.1 1161.2 T12(OH)7(OMe)6H+ 1159.1 1189.2 T12(OH)5(OMe)8H+ 1187.1 Conclusions We have successfully prepared a silsesquioxane-based delivery system for citral that contains more than 15wt% citral for slow release to provide long term protection against insect pests.
This range correspond to VS oligomers, and the proposed structural formulas corresponding to the peaks data were assigned with the generic formula (RSiO1.5)n (n = even number≥6; complete cage structure) or [RSiO1.5–(x+y)/2n]n(OH)x(OCH3)y (n = 4, 5, 6...; x, y = 1, 2, 3...; incomplete cage, ladder and branchedlinear structures)(as seen inTable 1)[10].These peaks data have excellent compliance between the experimental measurement value (m/z) and the calculated molecular weight according to ion adducts (M + H+) [11].
Assigned structure M/Z (pre.) 915.2 T10(OH)(OCH3)5H+ 915.0 969.2 T10(OH)7(OMe)5H+ 970.5 985.2 T10(OH)6(OMe)6H+ 983.1 1013.2 T11(OH)11(OMe)2H+ 1014.2 1029.2 T11(OH)10(OMe)3H+ 1029.0 1073.2 T12(OH)(OMe)5H+ 1073.0 1101.2 T12(OH)11(OMe)2H+ 1103.0 1117.2 T12(OH)8(OMe)3H+ 1117.0 1145.2 T12(OH)8(OMe)5H+ 1145.1 1161.2 T12(OH)7(OMe)6H+ 1159.1 1189.2 T12(OH)5(OMe)8H+ 1187.1 Conclusions We have successfully prepared a silsesquioxane-based delivery system for citral that contains more than 15wt% citral for slow release to provide long term protection against insect pests.