Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: April 2018
Authors: Sirithan Jiemsirilers, Pavadee Aungkavattana, Khanthima Hemra, Takaomi Kobayashi, Shuntaro Yamaguchi
The geopolymer structure is a three-dimensional aluminosilicate formed at ambient temperature or slightly above.
Moreover, there is a prism structure that grew up randomly from the dense geopolymer structure and it tends to be arcanite according to XRD analysis.
In contrast, the geopolymer structure was less observed when 50% KL replaced fly ash and presented the loose structure that affected to the lowest compressive strength.
However, the remained kaolin and metakaolin structure can be observed in the microstructure of geopolymer.
Davidovits, Geopolymer Chemistry and Applications, second ed., Institut Géopolymère, France, 2008
Moreover, there is a prism structure that grew up randomly from the dense geopolymer structure and it tends to be arcanite according to XRD analysis.
In contrast, the geopolymer structure was less observed when 50% KL replaced fly ash and presented the loose structure that affected to the lowest compressive strength.
However, the remained kaolin and metakaolin structure can be observed in the microstructure of geopolymer.
Davidovits, Geopolymer Chemistry and Applications, second ed., Institut Géopolymère, France, 2008
Online since: April 2019
Authors: Galina Slavcheva, Olga Vladimirovna Artamonova
This section can be correlated with the section of viscoplastic fluid with intensively damaged structure on the curve of P.A.
The third section is a section of cracking and irreversibly destruction of the structure.
Such structuring of the liquid phase in cement pastes ensures the increase of their firm stability and consequently buildability.
Chast 1 [Physico-chemical dynamics of structured nanodispersed systems and nanodispersed composite materials.
Shchukin Koagulyacionnye kontakty v dispersnyh sistemah [Coagulation contacts in dispersed systems] Chemistry, Moskow,1982.
The third section is a section of cracking and irreversibly destruction of the structure.
Such structuring of the liquid phase in cement pastes ensures the increase of their firm stability and consequently buildability.
Chast 1 [Physico-chemical dynamics of structured nanodispersed systems and nanodispersed composite materials.
Shchukin Koagulyacionnye kontakty v dispersnyh sistemah [Coagulation contacts in dispersed systems] Chemistry, Moskow,1982.
Online since: March 2024
Authors: Pornsawan Assawasaengrat, Pongsert Sriprom, Chaiyawat Na Lampang, Kanjana Manamoongmongkol, Lamphung Phumjan, Woatthichai Narkrugsa
The XRD results indicated that the TiO2 prepared by the sol-gel method was an anatase crystalline structure.
The gel, which is transparent, colorless, thermostable, and biocompatible with ordered structure and from renewable resources and made cost-effective, is in great demand globally.
The crystal structure of Titania sols was characterized by X-ray diffraction (XRD), the source of X-ray is given by a Cu-Kα radiation (λ = 0.15418 nm).
The chemical structure of the Chitosan-Xyloglucan/TiO2 was confirmed by FTIR.
Results in Chemistry.
The gel, which is transparent, colorless, thermostable, and biocompatible with ordered structure and from renewable resources and made cost-effective, is in great demand globally.
The crystal structure of Titania sols was characterized by X-ray diffraction (XRD), the source of X-ray is given by a Cu-Kα radiation (λ = 0.15418 nm).
The chemical structure of the Chitosan-Xyloglucan/TiO2 was confirmed by FTIR.
Results in Chemistry.
Online since: November 2018
Authors: Arturs Lukasenoks, Rolands Cepuritis
All the restrained conditions realized by either the developed cubical steel shell (for single fibre pull-out) or existing beam and cube moulds simulate internal (from steel fibres in concrete) and external (from friction against sub-base) restraints that hinder expansion of the concrete due to the use of special expansive additives in a flooring slab structure installed on ground.
If the expansive additive chemistry, dosage rate and concrete proportioning is properly controlled to achieve the right level of the concrete pre-stress, any tensile stress (such as the tensile stress resulting from restrained drying shrinkage) smaller than the compressive pre-stress will not result in cracking of the concrete elements.
One reason for the unexpected synergy is thought to be the positive impact of the specific restraint conditions in such structures on the resulting mechanical properties of the steel fibre reinforced concrete.
It is anticipated that if such conditions, that are much closer to the conditions in actual flooring slab structures on grade, could be realised also for the compressive and flexural test samples, the observed beneficial effect of the restrained concrete expansion would be closer to the single fibre pull-out.
On the other hand, it can already be recommended, that in order to measure the compressive strength of concrete plate structures on ground that are realised without a slip membrane and utilising steel fibres and expansive concrete additives, the cube or cylinder samples should be prepared in rigid steel moulds and hardened under water without demoulding.
If the expansive additive chemistry, dosage rate and concrete proportioning is properly controlled to achieve the right level of the concrete pre-stress, any tensile stress (such as the tensile stress resulting from restrained drying shrinkage) smaller than the compressive pre-stress will not result in cracking of the concrete elements.
One reason for the unexpected synergy is thought to be the positive impact of the specific restraint conditions in such structures on the resulting mechanical properties of the steel fibre reinforced concrete.
It is anticipated that if such conditions, that are much closer to the conditions in actual flooring slab structures on grade, could be realised also for the compressive and flexural test samples, the observed beneficial effect of the restrained concrete expansion would be closer to the single fibre pull-out.
On the other hand, it can already be recommended, that in order to measure the compressive strength of concrete plate structures on ground that are realised without a slip membrane and utilising steel fibres and expansive concrete additives, the cube or cylinder samples should be prepared in rigid steel moulds and hardened under water without demoulding.
Online since: December 2024
Authors: Xue Jiang, Nian Li, Xiao Mei Jiang, Zhen Guang Hu
If the curing temperature is too high, it may lead to excessive shrinkage or rupture of the material structure, but reduce its adsorption performance.
Studies suggest an amorphous three-dimensional network structure and that the amorphous properties change with the P/Al ratio [7].
This ratio could provide sufficient gel phase and adsorption site while maintaining appropriate pore structure and maximizing adsorption performance.
The gel phase provides higher densification and robustness, improving the structure and stability of the geopolymer, reflecting its evolution.
Journal of Solid State Chemistry, 2020, 281: 121025
Studies suggest an amorphous three-dimensional network structure and that the amorphous properties change with the P/Al ratio [7].
This ratio could provide sufficient gel phase and adsorption site while maintaining appropriate pore structure and maximizing adsorption performance.
The gel phase provides higher densification and robustness, improving the structure and stability of the geopolymer, reflecting its evolution.
Journal of Solid State Chemistry, 2020, 281: 121025
Online since: July 2023
Authors: Bobby Refokry Oeza, Eka Septi Rahmawati, Fahmi Astuti, Darminto Darminto
On the other hand, olivine-structured NaFePO4, where Na+ and Fe2+ ions occupy 4(a) and 4(c) sites, is metastable with respect to maricite-structured NaFePO4.
The synthesis of NaFePO4 via sol-gel method and study the structure of NaFePO4 are presented in this study.
O Na Fe P Fig. 1 Crystal structure of maricite NaFePO4.
Islam, Particle shapes and surface structures of olivine NaFePO4 in comparison to LiFePO4, Phys.
Zhang, Monoclinic phase Na3Fe2(PO4)3: synthesis, structure, and electrochemical performance as cathode material in sodium-ion batteries, ACS Sustainable Chemistry&Engineering 5 (2016) 1306-1314
The synthesis of NaFePO4 via sol-gel method and study the structure of NaFePO4 are presented in this study.
O Na Fe P Fig. 1 Crystal structure of maricite NaFePO4.
Islam, Particle shapes and surface structures of olivine NaFePO4 in comparison to LiFePO4, Phys.
Zhang, Monoclinic phase Na3Fe2(PO4)3: synthesis, structure, and electrochemical performance as cathode material in sodium-ion batteries, ACS Sustainable Chemistry&Engineering 5 (2016) 1306-1314
Online since: April 2016
Authors: Gong Wen Tang, Zhi Shan Yan, Xin Huang
Preparation and Organic Solvent Resistance of Water Soluble Hydantoin Epoxy/Organic Titanium Chelate Composite Coatings
Gong-wen Tang1,2,a, Zhi-shan Yan2 and Xin Huang2
1College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2Institute of Tianjin Seawater Desalination and Multipurpose Utilization, State Oceanic Administration, Tianjin 300192, China
a13752134728@163.com
Keywords: Water soluble, Hydantoin epoxy, Organic titanium chelate, Coating
Abstract.
The structure was characterized by 1H nuclear magnetic resonance (NMR) and fourier transform infrared spectroscopy (FTIR).
For waterborne epoxy/amine coatings, Wegmann et al [12] found that the main responsibility for the poor resistance to chemicals lied with an inhomogeneous film structure due to insufficient coalescence during the curing process.
More over, heterocyclic structure of hydantoin makes HE with good electrical isolation, heat resistance, weather resistance and abrasion performance.
The structure was characterized by 1H nuclear magnetic resonance (NMR) and fourier transform infrared spectroscopy (FTIR).
For waterborne epoxy/amine coatings, Wegmann et al [12] found that the main responsibility for the poor resistance to chemicals lied with an inhomogeneous film structure due to insufficient coalescence during the curing process.
More over, heterocyclic structure of hydantoin makes HE with good electrical isolation, heat resistance, weather resistance and abrasion performance.
Online since: March 2008
Authors: Mika Jokinen, Sami Areva
During film deposition, the structure of the film forms rapidly (as compared
to bulk structures) and is influenced by several complex factors.
Of these sol-gel derived TiO2 coatings have many beneficial properties such as ability to produce thin films, adjustable nano- and crystal structure and adjustable surface chemistry (especially OH-groups).
Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing.
structure and bioactivity of CaO-SiO2 glass.
Chemistry of silica.
Of these sol-gel derived TiO2 coatings have many beneficial properties such as ability to produce thin films, adjustable nano- and crystal structure and adjustable surface chemistry (especially OH-groups).
Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing.
structure and bioactivity of CaO-SiO2 glass.
Chemistry of silica.
Online since: May 2009
Authors: A.K. Tyagi, Dimple P. Dutta
In different prepared temperature Gd2(MoO4)3 has several structures [46].
Koshy, Journal of Solid State Chemistry Vol. 182 (2009), p. 203 [57] Li PL, Yang ZP, Wang ZJ, Guo QL.
Lin, Inorganic Chemistry, 47 (2008), p.7262 [156] W.
Jeon, Materials Chemistry and Physics Vol. 115 (2009), p. 161 [214] C.F.
Zhang, Journal of Solid State Chemistry 180 (2007), p. 3310 [220] E.
Koshy, Journal of Solid State Chemistry Vol. 182 (2009), p. 203 [57] Li PL, Yang ZP, Wang ZJ, Guo QL.
Lin, Inorganic Chemistry, 47 (2008), p.7262 [156] W.
Jeon, Materials Chemistry and Physics Vol. 115 (2009), p. 161 [214] C.F.
Zhang, Journal of Solid State Chemistry 180 (2007), p. 3310 [220] E.
Online since: March 2016
Authors: Peter Olegovich Rusinov, Zhesfina Blednova, M.A. Stepanenko, Andrew Nikolayevich Tarbin
For some years the authors have been working at new principles of self-organized surface structures of materials with SME in high-energy impacts, as well as studying the regularities of structure and phase formation and characteristics of functional and mechanical behavior in relation to the products in machine-building purposes.
It is known that technology of formation, pre-and post-treatment significantly influence the structure and properties of the surface composition.
Given the significant impact of surface modification methods, which determine the surface layer structure, the entire set of functional and mechanical properties of materials with shape memory effect is recommended to continue assess the impact of the structure dimension on corrosion and mechanical properties.
Adasheva, Investigation of the effect of plastic deformation on electrochemical behavior of NiTi in the austenitic and martensitic states, Bashkir Chemistry journal. 15 4 (2008) 90-94
The impact on the structure of NiTi features of the process of oxidation during heating and corrosion in chloride solutions.
It is known that technology of formation, pre-and post-treatment significantly influence the structure and properties of the surface composition.
Given the significant impact of surface modification methods, which determine the surface layer structure, the entire set of functional and mechanical properties of materials with shape memory effect is recommended to continue assess the impact of the structure dimension on corrosion and mechanical properties.
Adasheva, Investigation of the effect of plastic deformation on electrochemical behavior of NiTi in the austenitic and martensitic states, Bashkir Chemistry journal. 15 4 (2008) 90-94
The impact on the structure of NiTi features of the process of oxidation during heating and corrosion in chloride solutions.