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Online since: August 2013
Authors: Li Zhang, Lu Hong Zhang, You Gen Tang, Jian Hui Yan
Adsorption property of MgAl-NO3 layered double hydroxides
to methyl orange
Jianhui Yan1, 2,a, Luhong Zhang1,b, Yougen Tang2,c, Li Zhang1, 2,d
1School of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan Province, China
2College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan Province, China
aYanjh58@163.com, bluhong539@163.com, cygtang@263.net, dhgx.zl@163.com
Key words: MgAl-NO3 LDHs; adsorption; methyl orange
Abstract.
In the field of photocatalysis, LDHs have potential prospective in improving photocatalytic performance due to their layered structure and strong adsorption ability [3,4].
The morphology, crystal structure and the functional group of MgAl-NO3 LDHs were characterized by SEM, XRD and FT-IR.
It shows that the introduction of a large amount of MO molecules fuzzed up the layer-structure completely.
In accordance with the ratios up, the crystal structure of MgAl-NO3 LDHs is improving gradually, finally to form exfoliations or layers which have large surface for adsorbing anions and facilitating ion exchange.
In the field of photocatalysis, LDHs have potential prospective in improving photocatalytic performance due to their layered structure and strong adsorption ability [3,4].
The morphology, crystal structure and the functional group of MgAl-NO3 LDHs were characterized by SEM, XRD and FT-IR.
It shows that the introduction of a large amount of MO molecules fuzzed up the layer-structure completely.
In accordance with the ratios up, the crystal structure of MgAl-NO3 LDHs is improving gradually, finally to form exfoliations or layers which have large surface for adsorbing anions and facilitating ion exchange.
Online since: November 2013
Authors: Puteri Sarah Mohamad Saad, Fazlinashatul Suhaidah Zahid, Mohamad Rusop Mahmood
Less Iodine adsorbed at the CNTs surface while more Iodine substitutes in the hollow structure of the CNTs.
Yakuphanoglu, Electrical conductivity, optical and metal-semiconductor contact properties of organic semiconductor based on MEH-PPV/fullerene blend, Journal of Physics and Chemistry of Solids, vol. 69 (2008) 949-954
Eliseev, et al., Structure and electronic properties of AgX (X=Cl, Br, I)-intercalated single-walled carbon nanotubes, Carbon, 48 (2012) 2708-2721
Eitan, et al., Surface modification of multiwalled carbon nanotubes: toward the tailoring of the interface in polymer composites, Chemistry of Materials, 15 (2003) 3198-3201
Kim, et al., Hybrid solar cells with ordered TiO2nanostructures and MEH-PPV, Journal of Photochemistry and Photobiology A: Chemistry, 188 (2007) 364-370.
Yakuphanoglu, Electrical conductivity, optical and metal-semiconductor contact properties of organic semiconductor based on MEH-PPV/fullerene blend, Journal of Physics and Chemistry of Solids, vol. 69 (2008) 949-954
Eliseev, et al., Structure and electronic properties of AgX (X=Cl, Br, I)-intercalated single-walled carbon nanotubes, Carbon, 48 (2012) 2708-2721
Eitan, et al., Surface modification of multiwalled carbon nanotubes: toward the tailoring of the interface in polymer composites, Chemistry of Materials, 15 (2003) 3198-3201
Kim, et al., Hybrid solar cells with ordered TiO2nanostructures and MEH-PPV, Journal of Photochemistry and Photobiology A: Chemistry, 188 (2007) 364-370.
Online since: February 2021
Authors: Emmanuel Iwuoha, Sabelo Sifuba, Shane Willenberg, Usisipho Feleni, Natasha Ross
Cyclic voltammetry is an excellent tool in modern analytical chemistry.
SAXS was used to observe the internal structure of the materials and was measured on the small scale from 0˚ to 10˚.
SAXS reflections appears in similar positions with those observed on XRD (Fig. 1a) due to the stable structure of LiFe0.5Mn0.5PO4-MWCNTs.
Zaban, The Surface Chemistry of Lithium Electrodes in Alkyl Carbonate Solutions, Electrochem.
Astruc, Gold Nanoparticles: Assembly, Supramolecular Chemistry, Quantum-Size-Related Properties, And Applications Toward Biology, Catalysis, And Nanotechnology, Chem.
SAXS was used to observe the internal structure of the materials and was measured on the small scale from 0˚ to 10˚.
SAXS reflections appears in similar positions with those observed on XRD (Fig. 1a) due to the stable structure of LiFe0.5Mn0.5PO4-MWCNTs.
Zaban, The Surface Chemistry of Lithium Electrodes in Alkyl Carbonate Solutions, Electrochem.
Astruc, Gold Nanoparticles: Assembly, Supramolecular Chemistry, Quantum-Size-Related Properties, And Applications Toward Biology, Catalysis, And Nanotechnology, Chem.
Online since: November 2011
Authors: Ji Chang Zhang, Zi Li Liu, Tai Xuan Jia
Preparation and Properties of La/Ni-MoS2 Composites in Catalytic Hydrogenation of Sulfolene
Tai-xuan Jia1,2 ,a, Ji-chang Zhang1,b and Zi-li Liu2,c
1College of Chemistry & Environmental Engineering, Anyang Institute of Technology, Anyang 455000, China
2College of Chemistry & Chemical Engineering, Guangzhou University, Guangzhou 510006, Guangdong, China
ajiataixuan@163.com, b aydxzjc@gmail.com, c gzdxlzl@163.com
Keywords: La/Ni-MoS2; Sulfolene; Sulfolane; Catalytic hydrogenation
Abstract.
MoS2 had layered structure with interesting properties and practical applications, such as catalysts.
These properties and the closely related micro-structure, provided more experimental basis for technical transformation in modern industry.
Though there was a certain twisty on interlayer space, La/Ni-MoS2 still kept layers stack structure in totality.
Micro-structure and essential regularity of La/Ni-MoS2 were disclosed by XRD detection.
MoS2 had layered structure with interesting properties and practical applications, such as catalysts.
These properties and the closely related micro-structure, provided more experimental basis for technical transformation in modern industry.
Though there was a certain twisty on interlayer space, La/Ni-MoS2 still kept layers stack structure in totality.
Micro-structure and essential regularity of La/Ni-MoS2 were disclosed by XRD detection.
Online since: May 2012
Authors: Dominique Planson, Sigo Scharnholz, Jawad Hassan, Mihai Lazar, Pierre Brosselard, Bertrand Vergne, Anne Henry, Nicolas Thierry-Jebali, Erik Janzén, Gabriel Civrac, Farah Laariedh
Since the in-situ surface preparation and growth process are different for on-axis homoepitaxial growth [3], layers on both substrates were grown separately but with a similar N-/P+/P++ epilayer structure, both in terms of thickness (12 µm / 1 µm / 1 µm) and doping concentrations (5×1015 cm-3 / 8×1017 cm-3 / 5×1019 cm-3), as shown in Fig. 1.
This structure is typical for a 1200 V blocking device.
The 8 µm deep mesa has been etched with SF6/O2 chemistry in a Reactive Ion Etching equipment at 250 W, 60 mTorr and using Ni masks [6].
Fig. 6 shows the repartition of the equipotentials in a PIN mesa structure as calculated by simulations.
Simulated equipotentials in a mesa PiN diode N- layer at 500 V reverse bias depending on the surface charge density. a) for a 0 cm-2 charge density b) for a 5×1012 cm-2 charge density Conclusion A N-/P+/P++ epilayer structure has been grown using an on-axis wafer.
This structure is typical for a 1200 V blocking device.
The 8 µm deep mesa has been etched with SF6/O2 chemistry in a Reactive Ion Etching equipment at 250 W, 60 mTorr and using Ni masks [6].
Fig. 6 shows the repartition of the equipotentials in a PIN mesa structure as calculated by simulations.
Simulated equipotentials in a mesa PiN diode N- layer at 500 V reverse bias depending on the surface charge density. a) for a 0 cm-2 charge density b) for a 5×1012 cm-2 charge density Conclusion A N-/P+/P++ epilayer structure has been grown using an on-axis wafer.
Online since: July 2012
Authors: Lei Wang, Fang Wang, Deng Deng, Xiao Ping Huo
Effects of Montmorillonite and Acrylic Acid on the Superabsorbent Polymer Based on Xanthan
Xiaoping Huo1,a, Fang Wang2, Deng Deng3, Lei Wang4*
1Xijing University, Xi’an, Shaanxi Province, 710123, China
2Department of Chemistry, Shaanxi Institute of Education, Xi’an, Shaanxi Province, 710061, China
3Xi'an Modern Chemical Institute, Xi'an, Shaanxi Province, 710065, China
4Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry,Ministry of Education.
Superabsorbent polymers are known as hydrophilic network structured polymers having hydrophilic functional groups such as, hydroxyl, carboxylic acid, and amines [4-7].
Xanthan gum is a polysaccharide of microbial synthesis produced by xanthomonas campestris, whose chemical structure is presented in the literature [10, 11].
At the supermolecular level, the macromolecules of XG adopt a double helicoidal structure stabilized by inter and intramolecular hydrogen bonds [13].
Besides network structure, hydrophilic group is also an important factor on the absorbencies of polymer.
Superabsorbent polymers are known as hydrophilic network structured polymers having hydrophilic functional groups such as, hydroxyl, carboxylic acid, and amines [4-7].
Xanthan gum is a polysaccharide of microbial synthesis produced by xanthomonas campestris, whose chemical structure is presented in the literature [10, 11].
At the supermolecular level, the macromolecules of XG adopt a double helicoidal structure stabilized by inter and intramolecular hydrogen bonds [13].
Besides network structure, hydrophilic group is also an important factor on the absorbencies of polymer.
Online since: June 2012
Authors: Long Gui Peng, Guang Cheng Zhang
Performance of Water Absorption and Retention Material and Chemical synthesis of Calcium Lignin Sulphonate with Acrylamide and Acrylic Acid
Longgui Peng 1,2,a, Guangcheng Zhang 1,b
1Department of Applied Chemistry of Science College, Northwestern Polytechnical University, Xi’an, 710072 ,P.
In recent years, R.J.A.Gosselink, et al.[2,3] further researched the connection modes of lignin sulphonate molecules, and considered that its structure in solution was based on topological structure and conformation of its polymer chain, and there existed ruleless branched chains and the characteristics of branched macromolecule electrolyte decided that its thermodynamics flexibility belonged to medium degree rigidity bond polymer.
However, the reports on the preparation of high water absorption and retention material with lignin sulphonate are few because of complex molecular structure, difficult purification, and hard control on reaction process[5].
When the addition of crosslinking agent is higher than 0.07wt%, the network structure is too dense, the crosslinking density is high, the segmer shortens, the flexibility of segmer decreases, the space dilatability of net is limited, the water molecules entering in the net decrease and are absorbed in net circumference as free water, and the material has higher water loss ratio during heating compared with the sample with 0.03wt% of crosslinking agent.
Chemistry, 2001,(8):470-477 [4]Jiang Tingda.Lignin[M].BeiJing: Chemical Industry Press,2001:117-155 [5]Chen R L, Kokta B V, Daneault C,et al.
In recent years, R.J.A.Gosselink, et al.[2,3] further researched the connection modes of lignin sulphonate molecules, and considered that its structure in solution was based on topological structure and conformation of its polymer chain, and there existed ruleless branched chains and the characteristics of branched macromolecule electrolyte decided that its thermodynamics flexibility belonged to medium degree rigidity bond polymer.
However, the reports on the preparation of high water absorption and retention material with lignin sulphonate are few because of complex molecular structure, difficult purification, and hard control on reaction process[5].
When the addition of crosslinking agent is higher than 0.07wt%, the network structure is too dense, the crosslinking density is high, the segmer shortens, the flexibility of segmer decreases, the space dilatability of net is limited, the water molecules entering in the net decrease and are absorbed in net circumference as free water, and the material has higher water loss ratio during heating compared with the sample with 0.03wt% of crosslinking agent.
Chemistry, 2001,(8):470-477 [4]Jiang Tingda.Lignin[M].BeiJing: Chemical Industry Press,2001:117-155 [5]Chen R L, Kokta B V, Daneault C,et al.
Online since: May 2004
Authors: J. Méndez-Vivar, E. Loyo-Arnaud, S.S. Martínez-Fuentes, R. Muñoz-Durán, L. Valdez-Castro, R. Mendoza-Serna
The solids were also studied by scanning electron microscopy (SEM), and
X-ray diffraction (XRD) to compare the influence of size and structure of the chelating agent in the
particle size and the cristallite size distribution.
The differences in structure and bond chemistry between those alkoxides require a careful procedure to polymerize simultaneously the mixed sols and to tailor the structure at molecular scale [7].
These results indicate that the powders structure was stable up to 873 K.
Banash in Better Ceramics Through Chemistry IV, 180, Materials Research Society Symposium Proceedings, 1990, p.727
The differences in structure and bond chemistry between those alkoxides require a careful procedure to polymerize simultaneously the mixed sols and to tailor the structure at molecular scale [7].
These results indicate that the powders structure was stable up to 873 K.
Banash in Better Ceramics Through Chemistry IV, 180, Materials Research Society Symposium Proceedings, 1990, p.727
Online since: January 2005
Authors: Jian Yi Lin, J. Ding, T.J. White, Zeng Yong Zhong, B.H. Liu, Z.L. Dong
Further to our previous
works [5-7], in this work, we present detailed studies on the alloying effects, structure and phase
evolution during mechanical milling and the subsequent thermal treatment.
Further calcination at higher temperatures of 600 oC and 800 oC gave rise to well crystallized corundum structure, while for F20 sample annealed at 1200 o C, α-Fe2O3 phase was detected.
Such high reducibility could be ascribed to the porous and fine-grained structures of the precursors, as indicated by SEM analysis.
This was in agreement with our previous work in which we reported that mechanically alloyed powder possessed higher reducibility than the wet-chemistry derived powders [5].
Lin: Chemistry Physics Letters Vol 358 (2002), p. 96 [8] M.
Further calcination at higher temperatures of 600 oC and 800 oC gave rise to well crystallized corundum structure, while for F20 sample annealed at 1200 o C, α-Fe2O3 phase was detected.
Such high reducibility could be ascribed to the porous and fine-grained structures of the precursors, as indicated by SEM analysis.
This was in agreement with our previous work in which we reported that mechanically alloyed powder possessed higher reducibility than the wet-chemistry derived powders [5].
Lin: Chemistry Physics Letters Vol 358 (2002), p. 96 [8] M.
Online since: February 2011
Authors: Ming Yi Zhu, Jia Min Zhang, Zhao Xun Lian, Rong Zhu
Influencing on Structure and Mechanical Properties of PA6/PP Blends for Different Graft Yield Compatibilizer
Jiamin Zhang 1, a, Mingyi Zhu 2,b , Zhaoxun Lian 1,c , Rong Zhu 1,d
1 School of Chemistry & Chemical Engineering , Henan Institute of Science and Technology, Xinxiang, Henan, 453003 , China
2 Department of Automobile , Henan Mechanical and Electrical Engineering College, Xinxiang Henan 453002
a shuimugfz@163.com, b bzmingyi@126.com, c czhxalian@yahoo.com.cn, dhappylife111@tom.com
Keywords: Nylon 6/PP Blends; Graft Yield; Mechanical Properties
Abstract.
The main purpose of this paper is to introduce polar functional groups MAH on VERSIFY (V ethylene-propylene copolymer of the content of ethylene is 12%),produce V-g-(MAH-co-St) by changing the content of MAH, apply the graft copolymer to PA6/PP blends, study the influence on structure and mechanical properties of PA6/PP blends for different graft yield compatibilizer ,and explore getting structure controllable PA6/PP blends which has good performance.
Journal of Polymer Science: Part A: Polymer Chemistry, 1998, 36(13): 2763~2774
The main purpose of this paper is to introduce polar functional groups MAH on VERSIFY (V ethylene-propylene copolymer of the content of ethylene is 12%),produce V-g-(MAH-co-St) by changing the content of MAH, apply the graft copolymer to PA6/PP blends, study the influence on structure and mechanical properties of PA6/PP blends for different graft yield compatibilizer ,and explore getting structure controllable PA6/PP blends which has good performance.
Journal of Polymer Science: Part A: Polymer Chemistry, 1998, 36(13): 2763~2774