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Online since: September 2009
Authors: Maria J. Mosquera, Desireé M. de los Santos, Teresa Rivas, Patricia Sanmartín, Benita Silva
These products polymerize in situ inside the pore structure of the disintegrating stone, through a classic sol-gel process, and significantly increase the cohesion of the material.
We [3,5] have characterized the pore structure of dried gels from two popular commercial consolidants: Wacker OH (from Wacker) and Tegovakon V (from Goldschmidt).
This structure is clearly observed in the SEM micrograph of the UCA-1 gel (see Figure 5).
Changes in the pore structure of the stone after treatments were checked by Mercury Intrusion Porosimetry (MIP).
Scherer: Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press: New York, USA 1990)
Online since: May 2017
Authors: Margarita Isaenkova, Evgeny Grigoriev, Artem Lunev, Artem Zazolin, Denis Pchelyakov, Yuri Perlovich, Olga Krymskaya
Due to its viscosity, this liquid did not flood the porous structure of the powder compacts.
After having been deformed, the latter slide easily into a more close-packed structure.Considering the final proposition, it is necessary to additionally check if the density of dislocations measured with a direct method shows the same tendency as the results of indirect evaluation of XRD data presented in this work.
Khlunov, An attempt to reproduce high burn-up structure by ion irradiation of SIMFUEL, Journal of Nuclear Materials 452, 1-3 (2014) 147-157
Goddard, Scanning tunneling microscopy of the UO2 (111) surface, Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 14, 2 (1996) 966-969
Crocombette, Diffusion model of the non-stoichiometric uranium dioxide, Journal of Solid State Chemistry 203 (2013) 145-153.
Online since: April 2022
Authors: Paulo B. Lourenço, Raul Fangueiro, Daniel V. Oliveira, Natália M Alves, Ali Abbass, Maria Conceição Paiva
Thus, films cast from continuous pure wax might be subjected to microcracking of its structure and, consequently, faster moisture penetration to the substrate beneath may occur.
These observations suggest that the acidity of the coatings and treatment conditions were not aggressive to the fibers´ structure, and hence, did not damage the yarns, Table 1.
Toledo Filho, “Effect of hornification on the structure, tensile behavior and fiber matrix bond of sisal, jute and curauá fiber cement based composite systems,” Constr.
Roberts, Chitin Chemistry.
Qin, “Structure and properties of layer-by-layer self-assembled chitosan/lignosulfonate multilayer film,” Mater.
Online since: June 2014
Authors: Hai Bo Yu, Yu Zhao Feng, Li Wei Sheng, Heng Zhang, Peng Fei Li, Rong Ji Sun
The rapid economic development has accelerated the process of urbanization, which also has prompted a large adjustment of the industrial structure.
Overview of the Domestic Contaminated Sites Concept and Classification.Clarifying the definition of contaminated sites is very important for its identification and management. [5] In the “the contaminated sites terms” (HJ682-2014), which is latest released by Chinese Ministry of Environmental Protection, “site” is defined as a plot within the scope of the soil, groundwater, surface water, and land in the sum of all structures, facilities and biology; “contaminated site” is defined as a site that are confirmed harmful to human health or exceeded the acceptable environmental risk level of the venue after the authoritative investigation and risk assessment, which is a result of engaging in production, management, processing, storage of toxic and hazardous substances; stacking, disposal and treatment of potential hazardous waste; as well as the pollution caused by mining activities.
Ecological risk refers to species, ecosystems, and the normal function of the whole landscape by external stress, so as to reduce its health, the productivity, the possibility of genetic structure, the economic value and the aesthetic value in current and future within certain elements in ecological system[18].Domestic scholars Liu Jing [19] pointed out that ecological risk assessment methods can be divided into four types, including: (1) the evaluation model, such as the conceptual model [20] and the mathematical model[21].(2) the ecological risk evaluation index, such as the potential ecological risk index method [22], the accumulation exponential method [23], the regression analysis method[24].(3) the morphological analysis , such as the multi-step extraction and the step extraction;(4) the plant culture method.
The body structures and dietary habits between Chinese people and foreigners are different, so the accuracy of the result will been influenced definitely.
Progress in chemistry 2009,Z1:558-565.
Online since: March 2019
Authors: Roto Roto, Endang Tri Wahyuni, Mirma Prameswari
Antibacterial Activity of TiO2-Ag-Nanoparticle under Visible Light ENDANG Tri Wahyunia*, ROTO Rotob and MIRMA Prameswaric Chemistry Department Faculty of Mathematics and Natural Sciences Gadjah Mada University Sekip Utara POB 21 BLs Yogyakarta, Indonesia, 55821 aendang_triw@ugm.ac.id, broto05@ugm.ac.id, cmirmaprameswari@gmail.com Keywords: TiO2-Ag, antibacterial, visible light, E.coli, contaminated water Abstract.
The increase of the Ag concentration in low level is seen to enhance the Ag photo-deposited on TiO2 structure, but further increase of the AgNO3 concentration, the onlya slightincreaseis observed.
When TiO2has a semiconductor structure, absorbs the UV light, one electron (e-) is excited from the valence band into conduction band while leaving a hole (h+) that is positive radical [8].
The Ag atoms may also bedispersed thoroughly on the TiO2 structure [31] or form small clusters surrounding the surface of TiO2 [32].The increase of Ag formation facilitates more Ag to be inserted or to dispersed or to formclusters, and gradually destroyed the crystalline.
The increasing basal spacing (d) that is resulted from the Ag doping may infer the diffuse of Ag into the lattice of TiO2the structure that also causes the crystalline partially destroyed.
Online since: March 2019
Authors: Bo Zhao, Jing Guo, Yu Xin Yu, Tong Xu, Tian Yu Zhou, Shi Wen Zhou
However, due to the complex structure and numerous functional group of the epoxy coating, so that there were few researches were conducted on its aging mechanism, especially for epoxy zinc-rich coating, for the addition of zinc powder might change some aging properties, and cause differences in aging behaviors[15].
A new patented measuring device was employed in the measurements,, which has simple structure and reliable ability to collect the tiny electrochemical signal.
The device structure is shown in fig.1.
Notwithstanding the epoxy resin coating is not involved in the present investigation due to its extraordinarily molecular structure is too complex, and the functional groups composition, the changes of its functional groups can be determined from previous studies in detail.
Comparison of UV degradation chemistry in accelerated (xenon) aging tests and outdoor tests (II), Polymer Degradation and Stability. 46 (1994) 63-74.
Online since: August 2021
Authors: Fuh Yu Chang, Yu Xiang Huang, Chuan Fu Hsu
In Fig. 5 (a) – (c), it can be observed that some segments of the stent structure are deformed and slimmed.
It has been effectively used for surface finishing of complicated parts with robust structures.
However, implanted stents comprising a hollow grid structure cannot be processed with AFM.
“Tribochemical structuring and coating of implant metal surfaces with titanium oxide and hydroxyapatite layers.”
Materials Chemistry and Physic 15: p. 139-154
Online since: July 2012
Authors: Shan Shan Dai, Hong Ping Quan, Hong Sheng Lu, Tai Liang Zhang
Synthesis and evaluation of a novel retarded acid additive Hongping Quan Hongsheng Lu Tailiang Zhang Shanshan Dai School of Chemistry and Chemical Engineering, Southwest Petroleum University, Xindu, Sichuan 610500, P.
The structure of objective molecule was determined by using potassium bromide pressed disk method.
This spectrogram has just certificated that the structure of our product is in accordance with prediction [9-10].
This is because that this additive polymerizes rapidly when monomer concentration is too high [11] and thus has an influence on its molecular structure and weight, and in turn affects its scale inhibition performance.
This is because that this additive will be initiated rapidly when initiator dosage is too high and thus has an influence on its molecular structure and weight, and in turn affects its performance.
Online since: December 2012
Authors: Dipankar Chakravorty, Shilpi Banerjee
By NH3 gas treatment at a suitable temperature GaN nanoplates were grown inside the Na-4 structure.
For this reason pillar systems were introduced to the framework to maintain the structure
Also by tuning mesoporous structure the magnetic property could be controlled [50-52].
A yolk/shell mesoporous structure was shown to be a solution to this problem [82-83].
The electrochemistry of glucose oxidation has received considerable attention in recent years due to its significance in analytical chemistry, biology, and other scientific fields such as using glucose in the ecofriendly bio-fuel cells and sensing of glucose in blood for medical applications.
Online since: September 2007
Authors: Kwai S. Chan, Yi Ming Pan, Yi Der Lee
A local density-based full-potential linearized augmented plane wave (FLAPW) code, named WIEN2K, was utilized to compute the electronic structure and total energy of an n-atom supercell with atom positions designed to simulate the desired diffusion processes.
The electronic structure calculations were performed on the basis of one vacancy + (n-1) atoms in an n-atom bcc supercell, with n = 8 or 27, using a fully relativistic core and scalar relativistic valence electrons.
Chemistry Vol. 48 (1948), p. 345-348 [5] L.