A novel hybrid polyurethane composites with ZnO particles and sheath palm residues: Synergistic effect

2020 ◽  
Author(s):  
Noelle C. Zanini ◽  
Alana G. Souza ◽  
Rennan F. S. Barbosa ◽  
Derval S. Rosa ◽  
Daniella R. Mulinari

2018 ◽  
Vol 137 ◽  
pp. 438-445 ◽  
Author(s):  
Yongcun Li ◽  
Feilong Gao ◽  
Zhicheng Xue ◽  
Yunbo Luan ◽  
Xiaopeng Yan ◽  
...  


2019 ◽  
Vol 30 (9) ◽  
pp. 2480-2487 ◽  
Author(s):  
Qianqian Zhou ◽  
Kaili Gong ◽  
Keqing Zhou ◽  
Sijia Zhao ◽  
Congling Shi




2021 ◽  
Vol 44 (1) ◽  
Author(s):  
Anh Thi Le ◽  
Nurul Syuhada Binti Samsuddin ◽  
Sin-Ling Chiam ◽  
Swee-Yong Pung




The authors' methodic for assessing the role of chemical and physic-chemical factors during the structure formation of gypsum stone is presented in the article. The methodic is also makes it possible to reveal the synergistic effect and to determine the ranges of variation of controls factors that ensure maximum values of such effect. The effect of a micro-sized modifier based on zinc hydro-silicates on the structure formation of building gypsum is analyzed and corresponding dependencies are found. It is shown that effects of influence of modifier on the properties of gypsum compositions are determined by chemical properties of modifier. Among the mentioned properties are sorption characteristics (which depend on the amount of silicic acid and its state) and physicochemical properties - the ability to act as a substrate during crystal formation. The proposed method can also be extended to other binding substances and materials. This article contributes to the understanding of the processes that occur during the structure formation of composites, which will make it possible to control the structure formation in the future, obtaining materials with a given set of properties.



1998 ◽  
Vol 536 ◽  
Author(s):  
E. M. Wong ◽  
J. E. Bonevich ◽  
P. C. Searson

AbstractColloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz, Slyozov, Wagner theory for Ostwald ripening. In this model, the higher curvature and hence chemical potential of smaller particles provides a driving force for dissolution. The larger particles continue to grow by diffusion limited transport of species dissolved in solution. Thin films were fabricated by constant current electrophoretic deposition (EPD) of the ZnO quantum particles from these colloidal suspensions. All the films exhibited a blue shift relative to the characteristic green emission associated with bulk ZnO. The optical characteristics of the particles in the colloidal suspensions were found to translate to the films.



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