Calcium carbonate composite hydrogel films: Particle packing and optical properties

2012 ◽  
Vol 52 (6) ◽  
pp. 1317-1324 ◽  
Author(s):  
Murat Guvendiren ◽  
Andre A. Soshinski ◽  
Robert J. Gambogi ◽  
Shu Yang
Keyword(s):  
Optical Properties ◽  
Calcium Carbonate ◽  
Composite Hydrogel ◽  
Particle Packing ◽  
Hydrogel Films

Development of Photoactive g-C3N4/Poly(vinyl alcohol) Composite Hydrogel Films with Antimicrobial and Antibiofilm Activity

2020 ◽  
Vol 3 (3) ◽  
pp. 1681-1689 ◽  
Author(s):  
John H. Thurston ◽  
Andrew J. Clifford ◽  
Bradley S. Henderson ◽  
Tyler R. Smith ◽  
Dylan Quintana ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Composite Hydrogel ◽  
Poly Vinyl Alcohol ◽  
Antibiofilm Activity ◽  
Hydrogel Films

scholarly journals Surface and optical properties of calcium carbonate paper

2021 ◽  
Vol 57 (4) ◽  
pp. 472-479
Author(s):  
I. I. Ismailov ◽  
Kh. A. Babakhanova ◽  
A. A. Sadriddinov ◽  
M. A. Babahanova ◽  
D. Sh. Saidova
Keyword(s):  
Optical Properties ◽  
Calcium Carbonate ◽  
Quantitative Assessment ◽  
Incident Light ◽  
Reflection Coefficients ◽  
Paper Sample ◽  
Surface Reflection ◽  
Coated Papers ◽  
Paper Company ◽  
The Difference

The article investigates the surface and optical properties of calcium carbonate paper obtained at the UzbekChinese enterprise Fergana stone paper company (Uzbekistan), in order to identify the possibility of their use at printing enterprises for printing multicolor products using traditional printing methods. According to the results of a quantitative assessment of the surface quality by the indirect Beck method, we can say that paper sample 1 has a smoothness like coated paper (750–1500 s), paper samples 2 and 3 – like calendered paper, so that these paper samples can be recommended for prints with increased quality requirements. Smaller values of roughness Ra and small depressions, expressed by darkening in the topographic AFM images, characterized sufficient homogeneity and density of the structure. It was also revealed that the surface of the paper samples has a high ability to specularly reflect the incident light, since the percentage of surface reflection is similar to that of coated papers. Samples of paper have a whiteness of about 90 % and do not have a tint, since the difference between the maximum and minimum values of the reflection coefficients on a white stack is not more than 10 %. The tested paper samples can be recommended without restrictions for double-sided printing, since the opacity index is more than 92 %.

Effect of Calcium Carbonate Replacement on Workability and Mechanical Strength of Portland Cement Concrete

2015 ◽  
Vol 1115 ◽  
pp. 137-141 ◽  
Author(s):  
Maisarah Ali ◽  
Muhd Sufian Abdullah ◽  
Siti Asmahani Saad
Keyword(s):  
Calcium Carbonate ◽  
Particle Packing ◽  
High Rate ◽  
Target Strength ◽  
Natural Material ◽  
Hardened Concrete ◽  
Portland Cement Concrete ◽  
Concrete Mechanical Properties ◽  
Microscopy Analysis ◽  
Concrete Materials

The continued growth of the world construction sectors has resulted in high demand for concrete materials. The innovation of using filler as a replacement for cement is becoming a trend in order to reduce the cement consumption and provide benefit in various ways. Hence forth, 10% of cement was replaced by the calcium carbonate (CaCO3) in this study. CaCO3 is a natural material, which has a finer particles size as compared to the cement particles. This improves particle packing of concrete and give spacer effect. The concrete with CaCO3 replacement possess a higher slump, which increased the workability. The specimens were prepared in 150mm x 150mm x 150mm mould. At 28 days, the water absorbed by hardened concrete was lower for CaCO3 as microscopy analysis indicates very low porosity in CaCO3 concrete. Mechanical properties tests were conducted in 3, 7 and 28 days. The CaCO3 helps to increase the early strength, due to the accelerator effect and high rate of hydration which hardens the concrete quicker. At matured age, the concrete with the CaCO3 addition exhibits lower strength as compared with concrete without CaCO3, but still within the target strength.

scholarly journals Free-standing composite hydrogel films for superior volumetric capacitance

2015 ◽  
Vol 3 (30) ◽  
pp. 15668-15674 ◽  
Author(s):  
Mahmoud Moussa ◽  
Zhiheng Zhao ◽  
Maher F. El-Kady ◽  
Huakun Liu ◽  
Andrew Michelmore ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Composite Hydrogel ◽  
Free Standing ◽  
Conducting Composite ◽  
Volumetric Capacitance ◽  
Graphene Oxide Sheets ◽  
Hydrogel Films

Flexible, free-standing, high-performance supercapacitor electrodes were created by the development of a conducting composite hydrogel where graphene oxide sheets werein situreduced by polyaniline.

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