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Online since: November 2025
Authors: Sergii Zhartovskyi, Igor Stylyk, Oleksandr Titenko, Anatolii Kodrik
The unique chemical structure of AFFF gives it the characteristics of both oleophobicity and hydrophobicity.
To ensure the homogeneity of the hydrogel structure, the following were additionally used: rapeseed oil, colloidal silicon dioxide according to the recommendations specified in [14].
Sotiriadis, Determination of the Fire-Retardant Efficiency of Magnesite Thermal Insulating Materials to Protect Metal Structures from Fire.
Wu, Industrial & Engineering Chemistry Research - ACS Publications. 48 (2009) 3150–3157
Online since: September 2013
Authors: Khairul Nizar Ismail, Rafiza Abd Razak, Yahya Zarina, H. Kamarudin, A. Alida, A.M. Mustafa Al Bakri, Omar A. Abdulkareem
The polymerization process (geopolymerization) involves a substantially fast chemical reaction under alkaline conditions with Si and Al minerals that results in a three-dimensional polymeric chain and ring structure consisting of Si-O-Al-O bonds [2].
According to the authors, the structure is a result of the extensive dissolution of aluminosilicate species that occurs before polycondensation begins, resulting in the consolidation of the shapes of the specimen through a chaotic, three-dimensional network of polysodium aluminosilicate.
Moreover, other researcher reported that the deterioration in the structure of the high temperatures treated geopolymers was occurred due to the evaporation of the free water molecules as well as for chemically bonded water [12].
Geopolymer Chemistry Application.
Online since: August 2015
Authors: Rosari Saleh, Mia Putri Rahmawati, Vici Tritella Carmida, Nadia Febiana Djaja
Peak indexing confirmed that the synthesized nanoparticles are hexagonal wurtzite in structure and no impurity peaks are detected, such as Cr2O3 and ZnCr2O4.
Because MB is a cationic dye, its structure becomes positively charged when it is dissolved in water.
(ii) Because the surface of MB is positively charged, the photogenerated electrons can transfer to the surface of the particle and enter the molecular structure of MB which leads to the decomposition of MB [28,29].
Khushalani, Zinc Glycolate: A precursor to ZnO, Inorganic Chemistry 48 (2009) 3508-3510
Online since: December 2014
Authors: Osiris Canciglieri Junior, Rosana Adami Mattioda, Pamela Teixeira Fernandes, Jose Luiz Casela, Anna Mazzi
Thus, for companies insert the Eco design considerations in the development process of their products it is essential that the motivation of the organization and its managers [8], organizational structure, technical skills, problem solving processes and company culture are consistently aligned to their product development system, both in its architecture as in detailing their activities [9].
Therefore, is fundamental to have developed relationships or mappings between functions, behavior, product structures and their impact, both on the social and the environment aspects [15].
The first refinement within the 1220 articles was conducted with the keyword Model and its correlated keywords: Definition, Structure, Framework, Method, System, Process, Procedure, Principle and Practice.
Wozny, A Modular Approach to Sustainability Assessment and Decision Support in Chemical Process Design, Industrial & Engineering Chemistry Research, Vol. 49, no 17 (2010), p. 7870-7881
Online since: February 2013
Authors: Yu Li Dai, Yi Qiang Pei, Jing Qin, Jian Ye Zhang, Yun Long Li
The structure characteristic of the resources in China is lack of oil and gas, while relatively rich in coal.
In the short term, it is difficult to change the energy consumption structure which is dominated by coal.
In addition, the adiabatic temperature of hydrocarbon with annular structure is higher.
Journal of Fuel Chemistry and Technology.
Online since: October 2013
Authors: Hai Fan, Jian Chao Sun, Juan Cheng, Shi Yun Ai
Bifunctional Ag/AgCl/α-Co(OH)2 nanocomposite with Selective Adsorption and Photocatalytic Properties for Dyes Removal Jian-chao SUN1,a, Juan CHENG2, Hai FAN1,b and Shi-yun AI1 1College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong, 271018, People’s Republic of China 2Shandong Taikai Transformer Co.
However, few reports have been related on the synthesis of layered structure materials and visible light response Ag/AgCl nanocomposites with both adsorption and photocatalytic activities.
The structure and morphology of products were examined with field emission scanning electron microscopy (FESEM; JEOL, JSM6700F).
The pattern in Fig. 1C clearly indicates the layer structure of the α-Co(OH)2 with characteristic peaks (assigned as “*”) at 11.16o, 22.30o, 33.80o, 38.04o, corresponding to the (003), (006), (012) and (015) crystalline planes, sharp basal reflections attributable to an interlayer distance of 0.77 nm were observed, which is consistent with what reported in literature[6], suggesting the successful formation of α-Co(OH)2.
Online since: December 2019
Authors: Md. Sahadat Hossain, Md. Razzak, Nasrin A. Kona, Kamrun N. Keya, Ruhul Amin Khan, Md. Naimul Islam
Khan1* 1Polymer Composite Laboratory, Institute of Radiation and Polymer Technology, Bangladesh Atomic Energy Commission, GPO Box: 3787, Dhaka-1000, Bangladesh 2Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka-1000, Bangladesh *Corresponding Author: dr.ruhul_khan@yahoo.com Keywords: polypropylene, unsaturated polyester resin, Jute fiber, compression molding, hand lay –up, mechanical properties.
One of the major problems of jute fiber is the presence of a hydroxyl group in the cellulose structure [13-15].
These hydroxyl groups in the cellulose structure account for the strong hydrophilic nature of jute and as a result in jute fabrics reinforced polypropylene based composites, within 2 hours, composite absorbs such a huge amount of water.
References [1] Sharfun N Arju, AM Afsar, Mubarak A Khan, and Dipak K Das (2015), Effects of jute fabric structures on the performance of jute-reinforced polypropylene composites, Journal of Reinforced Plastics and Composites, 34, 16: 1306-1314
Online since: October 2021
Authors: Michal Matysík, Iveta Plšková, Libor Topolář, Petr Hrubý
Degradation of Materials Based on Alkali-Activated Blast-Furnace Slag after Exposure to Aggressive Environments Iveta Plšková1,a*, Petr Hrubý2,b, Libor Topolář1,c, Michal Matysík1,d 1Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech Republic 2Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 612 00 Brno, Czech Republic aplskova.i@fce.vutbr.cz, bxchrubyp@fch.vut.cz, cLibor.Topolar@vut.cz, dmatysik.m@fce.vutbr.cz Keywords: alkali-activated, blast-furnace slag, aggressive environments, ammonium nitrate solutions, sodium sulfate, rotating water, strength, impact-echo method, ultrasonic pulse velocity, weight changes.
The rapid loss of strength (compressive and flexural) of the samples in the ammonium nitrate solution can be explained as a consequence of leaching, particularly due to the decalcification process – leaching of calcium cations from the structure of the main binder gel (CASH in AAS or CSH, or portlandite and then CSH in the case of cement) occurs.
An accompanying phenomenon is increased porosity, i.e. a potential increase in permeability, leading to growing penetration of the aggressive medium into the structure.
Use of non-linear ultrasonic techniques to detect cracks due to steel corrosion in reinforced concrete structures, Materials, 12(5) (2019).
Online since: June 2020
Authors: Ming Gin Lee, You Xiang Wang, Yeng Fong Shih, Yu Cheng Kan, Ming Ju Lee
., Wufeng District, Taichung 41349, Taiwan 3Department of Applied Chemistry, Chaoyang University of Technology, No. 168, Jifeng E.
The main objective of the overall experimental approach has been to gain practical knowledge on the manufacturing technique, intending to adopt it effectively in the field of structure for the production of thin-walled, rice husk fiber concrete objects.
Zhang: Concrete marine structures: A state-of-the-art review, Marine Structures Vol. 3-3 (1990), p. 199-235
Online since: May 2015
Authors: Rane Ajay Vasudeo, V.K. Abitha, P.S. Suchithra, K. Rajkumar
(Formerly known as UDCT Bombay), Nathalal Parekh Marg, Matunga, Maharashtra, India. 2Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Kerala, India. 3Department of Chemistry, Calicut University, St Mary’s College, Kerala, India. 4Indian Rubbers Manufacturers Research Association, Thane, India.
The core-shell structure silica-poly(methyl methacrylate), SiO2-PMMA, nanoparticles were formed by grafting polymerization of MMA on the surface of the modified SiO2 particles via in situ emulsion, and then NR/SiO2 nanocomposite was prepared by blending SiO2-PMMA and PMMA-modified NR (NR-PMMA) [8].
The types of bonds that are formed by carbon black are of a physical nature and hence not much contribute to cure rate, but on contrary nano ATH has three basic hydroxyl groups attached to it, hence a chemical reaction takes place when nano ATH is added to the rubber matrix due to which a chemical bond is formed in the structure of rubber nanocomposites, and hence you may find decrease in scorch time and optimum cure time as there is an increase in loading of nano ATH.
Kong, Zheng Peng, Reinforcement of Natural Rubber with Core-Shell Structure Silica-Poly(Methyl Methacrylate) Nanoparticles, Journal of Nanomaterials,2012 (2012), 1-9 [9] H.S.