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Online since: March 2024
Authors: Li Shi, Rong Jin Huang, Lai Feng Li, Baoleer Baoleer, Yue Xiang, Wen Tao Sun, Zhi Xiong Wu
Analysis of the Curing Behavior of Cyanate/Epoxy Resins for Fusion Magnets
Baoleer1,2,a, Yue Xiang1,2,b, Li Shi1,c*, Wentao Sun1,d, Zhixiong Wu1,e*,
Rongjin Huang1,2,f, Laifeng Li1,2,g
1Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, 100190, China
2University of Chinese Academy of Sciences, Beijing, 100190, China
abaoleer21@mails.ucas.ac.cn, bxiangyue1822@163.com, cshili@mail.ipc.ac.cn,dwentaosun@mail.ipc.ac.cn, ezxwu@mail.ipc.ac.cn, fhuangrongjin@mail.ipc.ac.cn, glaifengli@mail.ipc.ac.cn
Keywords: cyanate; epoxy resin; fusion magnet; thermal runaway; flash polymerization
Abstract.
ITER IF coils and the German WX-7 star simulator fusion reactor both use cyanate ester/epoxy resin as the matrix material for their insulation structure.
Cyanate resins are a class of thermosetting resins with -OCN functional groups at the end groups, which have a resonant structure due to the high electronegativity of the oxygen and nitrogen atoms and will undergo cyclization trimerization reactions under the action of heat and catalysts to form macromolecules with a highly cross-linked network structure containing triazine rings, which have high irradiation resistance [5,6], but because of their brittleness and high price, they are often blended with epoxy resins in blends to achieve cost reduction and toughening [7-9].
ITER IF coils and the German WX-7 star simulator fusion reactor both use cyanate ester/epoxy resin as the matrix material for their insulation structure.
Cyanate resins are a class of thermosetting resins with -OCN functional groups at the end groups, which have a resonant structure due to the high electronegativity of the oxygen and nitrogen atoms and will undergo cyclization trimerization reactions under the action of heat and catalysts to form macromolecules with a highly cross-linked network structure containing triazine rings, which have high irradiation resistance [5,6], but because of their brittleness and high price, they are often blended with epoxy resins in blends to achieve cost reduction and toughening [7-9].
Online since: April 2012
Authors: Shu Juan Yu, Fang Yang, Yu Xin Liu, Yong Fei Zhu, Li Bei Yao, Wei Su, Li Fang Liang
Screen-Printing-Based Fabrication of Silver Patterns on Polyimide Substrate
Fang Yang1, a, Wei Su1, b , Libei Yao1, c, Lifang Liang1, d, Yuxin Liu1, e,
Shujuan Yu1, f and Yongfei Zhu1, g
1College of Chemistry and Life Science, Guangxi Teachers Education University, Nanning 530001, China
afangzhi2913@163.com,baaasuwei@yahoo.com.cn, cyaolibei@163.com, dlianglifang1964@yahoo.com.cn, eliuyuxin889@126.com, fsjyu2001@yahoo.com.cn, gmingyxu@sina.com
Keywords: Polyimide Substrate, Silver Patterns, Screen-Printing, Ion-exchange reaction
Abstract.
Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, infrared spectra (FT-IR) and contact angles analyses were conducted to study the morphology, composition and structure of the obtained silver patterns on the PI substrate.
Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, infrared spectra (FT-IR), and contact angles analyses were conducted to study the morphology, composition and structure of the obtained silver patterns on the PI substrate.
The change of the surface structure of above-mentioned PI film is further verified by contact angles, and the photographs of a water droplet on the surface of these PI films are shown in Fig. 3.
Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, infrared spectra (FT-IR) and contact angles analyses were conducted to study the morphology, composition and structure of the obtained silver patterns on the PI substrate.
Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, infrared spectra (FT-IR), and contact angles analyses were conducted to study the morphology, composition and structure of the obtained silver patterns on the PI substrate.
The change of the surface structure of above-mentioned PI film is further verified by contact angles, and the photographs of a water droplet on the surface of these PI films are shown in Fig. 3.
Online since: September 2014
Authors: Panyawat Wangyao, Nattadon Udompanit, Yuttanant Boonyongmaneerat, Suparoek Henpraserttae
This thus enables the fabrication of Ni-W CMMC of different multilayer structure, and ultimately the establishment of the relationship between the microstructure and the tribological properties of the alloy deposits.
These were followed by Ni-strike plating and dipping in 10% H2SO4 for 5 second just prior to the 60 min deposition at 75 oC, with the following bath chemistry: 147 g/l Na3C6H5O7.2H2O, 26.7 g/l NH4Cl, 15.8 g/l NiSO4.6H2O, 46.2 g/l Na2WO4.2H2O and 15.5 g/l NaBr.
An introduction of W atoms into the Ni matrix results in grain size reduction, due to segregation of W atoms to the grain boundaries of Ni, which in turn thermodynamically stabilize the fine grain structure [1, 3, 27].
Fig.1 XRD profiles of Ni-W specimens (A, B, C, and D) with different W contents Multilayer Structure.
The improvement of the wear resistance of CMMC with a more refine layered structure may thus be owed to the improvement of the hardness of the deposits.
These were followed by Ni-strike plating and dipping in 10% H2SO4 for 5 second just prior to the 60 min deposition at 75 oC, with the following bath chemistry: 147 g/l Na3C6H5O7.2H2O, 26.7 g/l NH4Cl, 15.8 g/l NiSO4.6H2O, 46.2 g/l Na2WO4.2H2O and 15.5 g/l NaBr.
An introduction of W atoms into the Ni matrix results in grain size reduction, due to segregation of W atoms to the grain boundaries of Ni, which in turn thermodynamically stabilize the fine grain structure [1, 3, 27].
Fig.1 XRD profiles of Ni-W specimens (A, B, C, and D) with different W contents Multilayer Structure.
The improvement of the wear resistance of CMMC with a more refine layered structure may thus be owed to the improvement of the hardness of the deposits.
Online since: March 2016
Authors: Qing Ge Feng, Tao Yu Qiu, De Jiang Liu, Xin Ye Wang
References
[1] Shigeru Kohtani, Shigeki Makino, Akihiko Kudo, Photocatalytic Decoloration of 4-n-Nonylphenol under Irradiation from Solar Simulator, Comparison between BiVO4 and TiO2 Photocatalysts, Chemistry Letters(2002)660
Synthesis and photocatalytic behavior of BiVO4 with decahedral structure, Ceramics International 39 (2013) 7461–7465
Hydrothermal synthesis and visible-light photocatalytic activity of porous peanut-like BiVO4 and BiVO4/Fe3O4 submicron structures / Ceramics International 39 (2013) 9164
[17] Li Zhang, Dairong Chen, and Xiuling Jiao , Monoclinic Structured BiVO4 Nano-sheets : Hydrothermal Preparation, Formation Mechanism, and Coloristic and Photocatalytic Properties, J.
Additive-free hydrothermal synthesis of novel bismuth vanadium oxide dendritic structures as highly efficient visible-light photocatalysts[J].
Synthesis and photocatalytic behavior of BiVO4 with decahedral structure, Ceramics International 39 (2013) 7461–7465
Hydrothermal synthesis and visible-light photocatalytic activity of porous peanut-like BiVO4 and BiVO4/Fe3O4 submicron structures / Ceramics International 39 (2013) 9164
[17] Li Zhang, Dairong Chen, and Xiuling Jiao , Monoclinic Structured BiVO4 Nano-sheets : Hydrothermal Preparation, Formation Mechanism, and Coloristic and Photocatalytic Properties, J.
Additive-free hydrothermal synthesis of novel bismuth vanadium oxide dendritic structures as highly efficient visible-light photocatalysts[J].
Online since: August 2017
Authors: Alexandru Popa, Liliana Rozemarie Manea, Anisoara Bertea
Core–shell structured nanofibers were produced from coaxial electrospun polyethylene glycol and polydodecyl thiophene encapsulated in the core [15].
Open pore morphologies have been obtained without using direct writing by melt electrospinning poly-(e-caprolactone) onto structured metallic collector substrates [34].
Wang, Characterizing the structure and properties of individual wire-like nanoentities, Adv Mater 12 (2000) 1295–1298 [2] Z.
Hekmati, Using the Taguchi method to investigate the effect of different parameters on mean diameter and variation in PA-6 nanofibres produced by needleless electrospinning, The Royal Society of Chemistry 5(2015) 76892–76897 [25] M.
Bosakova, Controlled gentamicin release from multi-layered electrospun nanofibrous structures of various thicknesses, Int.
Open pore morphologies have been obtained without using direct writing by melt electrospinning poly-(e-caprolactone) onto structured metallic collector substrates [34].
Wang, Characterizing the structure and properties of individual wire-like nanoentities, Adv Mater 12 (2000) 1295–1298 [2] Z.
Hekmati, Using the Taguchi method to investigate the effect of different parameters on mean diameter and variation in PA-6 nanofibres produced by needleless electrospinning, The Royal Society of Chemistry 5(2015) 76892–76897 [25] M.
Bosakova, Controlled gentamicin release from multi-layered electrospun nanofibrous structures of various thicknesses, Int.
Online since: May 2020
Authors: Hamimah Abdul Rahman, Nurul Akidah Baharuddin, Jarot Raharjo, Umira Asyikin Yusop, Tan Kang Huai
The SDC material was identified by JCPDS Card No. 01-075-0157 as Sm0.2Ce0.8O1.9 with a face-centred cubic lattice structure.
Ag commercial powder has shown XRD profile at JCPDS number 00-004-0783 (Silver-3C) with a face-centred cubic lattice structure.
Effects of dual porosity honeycomb structure in SSC–SDC composite cathode for SOFCs.
Materials Chemistry and Physics 141(2-3) (2013) 752-757
[18] Qing Xu, Duan Ping Huang, Feng Zhang and Han Xing Liu, Structure electrical conducting and thermal expansion properties La0.6Sr0.4Co0.8Fe0.2O3-δ – Ce0.8Sm0.2O2-δ composite cathodes, Journal of Alloys and Compound 454(s1-2): (2008) 460-465
Ag commercial powder has shown XRD profile at JCPDS number 00-004-0783 (Silver-3C) with a face-centred cubic lattice structure.
Effects of dual porosity honeycomb structure in SSC–SDC composite cathode for SOFCs.
Materials Chemistry and Physics 141(2-3) (2013) 752-757
[18] Qing Xu, Duan Ping Huang, Feng Zhang and Han Xing Liu, Structure electrical conducting and thermal expansion properties La0.6Sr0.4Co0.8Fe0.2O3-δ – Ce0.8Sm0.2O2-δ composite cathodes, Journal of Alloys and Compound 454(s1-2): (2008) 460-465
Online since: September 2005
Authors: J. Molenda, K. Świerczek, J. Marzec, M. Ziemnicki
Marzec
Department of Solid State Chemistry
Faculty of Materials Science and Ceramics
AGH University of Science and Technology
al.
For many dopants, the charging curve changes its shape significantly, thus suggesting a modification in the electronic structure of the manganese spinel.
X-ray studies revealed that all of the obtained spinel samples were mono-phase and had a cubic (Fd3m) structure at room temperature.
The studies of electronic structure using the DV-X molecular orbital method by Liu et al. [14] suggest that the 3d states of nickel are located below the 3d states of manganese.
Close correlation between the amount of dopant xNi and the shape of charge curves results from the electronic structure of the cathode material.
For many dopants, the charging curve changes its shape significantly, thus suggesting a modification in the electronic structure of the manganese spinel.
X-ray studies revealed that all of the obtained spinel samples were mono-phase and had a cubic (Fd3m) structure at room temperature.
The studies of electronic structure using the DV-X molecular orbital method by Liu et al. [14] suggest that the 3d states of nickel are located below the 3d states of manganese.
Close correlation between the amount of dopant xNi and the shape of charge curves results from the electronic structure of the cathode material.
Online since: August 2014
Authors: Hong Mei Wang, Shi Zhong Luo, Hong Li Sun
Thomas, Adsorption kinetics and size exclusion properties of probe molecules for the selective porosity in a carbon molecular sieve used for air separation, The Journal of Physical Chemistry B. 105 (2001) 10619-10629.
]:
Low active temperature and relative short time had rarely changed the pore structure of CO2-CMSs, as well as Cu-CMSs.
The modification of CO2 and Cu(NO3)2 had rarely changed CMSs porous structure, while H2O2 treatment expanded the pore size and pore volume, and increased the specific surface area.
The N2 adsorption/desorption isotherms informed the pore structures and pore size distribution of the samples.
Activation at low temperature and relative short time by CO2 has rarely changed the porous structure of CMSs, while pore volume and specific surface area were totally altered by KOH activation.
Low active temperature and relative short time had rarely changed the pore structure of CO2-CMSs, as well as Cu-CMSs.
The modification of CO2 and Cu(NO3)2 had rarely changed CMSs porous structure, while H2O2 treatment expanded the pore size and pore volume, and increased the specific surface area.
The N2 adsorption/desorption isotherms informed the pore structures and pore size distribution of the samples.
Activation at low temperature and relative short time by CO2 has rarely changed the porous structure of CMSs, while pore volume and specific surface area were totally altered by KOH activation.
Online since: June 2014
Authors: Li Guo, Xiao Zhong Zhang, Fan Qin Meng, Shi Zhao Yang
Quick coupler
Sample injection
Optical detection
Automatic extraction
Embedded system
Temperature control unit
Wastewater collection and treatment
Fig.1 Overall structure
This syste mainly includes the Quick coupler, automatic Sample injection, automatic extraction chip, liquid waste collection and processing, optical detection component, embedded computer and temperature control unit.
Therefore, the microfluid chip technology can realize the efficient extraction of anti icing additive. 3.2 design of liquid-liquid extraction microfluid chip for anti icing addictive in jet fuel Micro fluid control liquid-liquid extraction is one of the latest development separation technology in Analytical chemistry.
A overall micro fluidic chip have fixture, sealing system and support platform in the structure.
flow cell Lamp Spectrometer fibre optical path length fibre Fig.6 The structure of the measurement system By using the measurement system, absorption spectra of the 2% and 0.2% anti icing agent water solution are measured as shown in Figure 7. the concentration ratio of extraction was 4, corresponding anti icing addictive concentration in jet fuel is 0.5% to 0.05%.
Because the flow cell can be integrated into the micro fluidic chip, an integration of the micro fluidic extraction and spectral analysis is realized, the equipment volume is further reduced, the structure is simplified, the performance of on-line measurement is improved.
Therefore, the microfluid chip technology can realize the efficient extraction of anti icing additive. 3.2 design of liquid-liquid extraction microfluid chip for anti icing addictive in jet fuel Micro fluid control liquid-liquid extraction is one of the latest development separation technology in Analytical chemistry.
A overall micro fluidic chip have fixture, sealing system and support platform in the structure.
flow cell Lamp Spectrometer fibre optical path length fibre Fig.6 The structure of the measurement system By using the measurement system, absorption spectra of the 2% and 0.2% anti icing agent water solution are measured as shown in Figure 7. the concentration ratio of extraction was 4, corresponding anti icing addictive concentration in jet fuel is 0.5% to 0.05%.
Because the flow cell can be integrated into the micro fluidic chip, an integration of the micro fluidic extraction and spectral analysis is realized, the equipment volume is further reduced, the structure is simplified, the performance of on-line measurement is improved.
Online since: November 2024
Authors: Muhammad Nadeem Azam, Aneela Wakeel
This phase forms small discrete particles or denderetic structures within the matrix of cupper.
The finer grain structure contributes to improved mechanical properties.
The topography and morphology studied of developed Aluminum bush alloy in SEM also showed a sound casting bushing sleeves have defect free structure.
Nnuka, "Effects of Nickel on the Structure and Mechanical Properties of Aluminum Bronze (Cu-10wt% Al)
Ridley, "The morphology, crystallography, and chemistry of phases in as-cast nickel-aluminum bronze," Metallurgical Transactions A, vol. 13, pp. 1337-1345, 1982.
The finer grain structure contributes to improved mechanical properties.
The topography and morphology studied of developed Aluminum bush alloy in SEM also showed a sound casting bushing sleeves have defect free structure.
Nnuka, "Effects of Nickel on the Structure and Mechanical Properties of Aluminum Bronze (Cu-10wt% Al)
Ridley, "The morphology, crystallography, and chemistry of phases in as-cast nickel-aluminum bronze," Metallurgical Transactions A, vol. 13, pp. 1337-1345, 1982.