scholarly journals Effects of In-Situ Filler Loading vs. Conventional Filler and the Use of Retention-Related Additives on Properties of Paper

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5066
Author(s):  
Maria Emiliana Fortună ◽  
Andrei Lobiuc ◽  
Lucian-Mihai Cosovanu ◽  
Maria Harja
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Filler Loading ◽  
Carbonate Content ◽  
Sem Images ◽  
Paper Properties ◽  
Calcium Carbonate Content ◽  
Optical And Mechanical Properties ◽  
Filler Retention

In the present paper, aspects concerning the obtained and characterization of additive systems used for maximizing filler retention, and the effects on paper properties, were investigated. The effects of retention additives over properties of paper, containing fibers from in-situ loading (IS-CCP), were analyzed against the effects of additives over properties of paper containing fibers from conventional loading, obtained by the addition of calcium carbonate in precipitated form (CCP). The physico-mechanical properties were analyzed by various analyses and investigations: calcium carbonate content, X-ray diffraction, scanning electron microscopy (SEM) images, optical and mechanical properties, in order to develop the best systems of retention additives for obtaining higher retention loads for making paper with high content of nano-filler material. The obtained results reveal that at the same level of calcium carbonate content, all paper samples with in-situ loading had higher the optical and mechanical properties than the paper obtained by conventional loading in all cases the additives studied. For all studied properties, nanoparticles had a positively influence over paper properties.

scholarly journals Effect of Calcium Carbonate on the Mechanical Properties and Microstructure of Red Clay

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Lijie Chen ◽  
Xuejun Chen ◽  
Xin Yang ◽  
Pengyan Bi ◽  
Xiang Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Carbonate Content ◽  
Shear Tests ◽  
Red Clay ◽  
Precipitated Calcium Carbonate ◽  
Sem Images ◽  
Clay Particles ◽  
Calcium Carbonate Content ◽  
Analysis System

The influence of precipitated calcium carbonate on the strength and microstructure of red clay was studied. Precipitated calcium carbonate was added to red clay at ratios of 0%, 5%, 10%, 15%, and 20%. Shear tests were carried out on the samples to observe the effect of calcium carbonate on the mechanical properties of red clay. The results showed that, with increasing calcium carbonate content, the strength of red clay first decreased and then increased. The maximum strength was obtained for the sample with 20% calcium carbonate. Scanning electron microscopy (SEM) was used to observe the changes in microstructure caused by addition of calcium carbonate. The pores and cracks analysis system (PCAS) was used to quantitatively characterize the microstructure changes detected in SEM images. The addition of calcium carbonate decreased the pore area and increased the total number of pores of red clay. The incorporation of calcium carbonate caused the red clay particles to agglomerate. The higher the calcium carbonate content, the stronger the agglomeration of red clay particles in the soil samples.

scholarly journals REPLACEMENT OF Ti02 PIGMENT BY CaC03 FROM CEFALONIA IN EMULSION PAINTS

2007 ◽  
Vol 40 (2) ◽  
pp. 759
Author(s):  
K. Kalafati ◽  
G. E. Christidis
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Great Part ◽  
Raw Material ◽  
Carbonate Content ◽  
White Pigment ◽  
High Calcium ◽  
Water Based ◽  
Tio2 Pigment ◽  
Optical And Mechanical Properties

The purpose of this work is to show that calcium carbonate from the chalky limestone deposits of Minies in Kefalonia, exploited by IONIAN KALK S.A., is a suitable raw material for paint industry and especially in emulsion (water based) paints. The deposit is characterized by a high calcium carbonate content (>99 %), high whiteness and low yellowness, by negligible content of heavy metals and low contents of MgO (<0.15 %), Si02 (<0.05 %) andFe203 (<0.01 %). This research was based on determination of the optical and mechanical properties of the emulsion white water based paints, which included calcium carbonate from the Kefalonia limestone deposits. The calcium carbonate replaced Ti02 pigment in various proportions. It is concluded that this product can be utilized not only as inert filler and extender but may have more functional application acting simultaneously as pigment. Replacement of TiO2 pigment by calcium carbonate may reach 50% without deteriorating the optical and mechanical properties significantly. Hence calcium carbonate from this deposit offers excellent optical properties to paints, reduces sufficiently their production cost and replaces a great part of the proportion of titanium dioxide, which is currently used as white pigment.

scholarly journals Opto‐electrochemical Dissolution Reveals Coccolith Calcium Carbonate Content

2021 ◽  
Author(s):  
Minjun Yang ◽  
Christopher Batchelor-McAuley ◽  
Samuel Barton ◽  
Rosalind E.M. Rickaby ◽  
Heather A. Bouman ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Carbonate Content ◽  
Electrochemical Dissolution ◽  
Calcium Carbonate Content

Characterization of the Aniline.DBSA/Thermoplastic Polyurethane Blends for the Thermo-Mechanical and Electro-Mechanical Properties

2021 ◽  
Vol 875 ◽  
pp. 96-103
Author(s):  
Ayesha Afzal ◽  
Iqra Abdul Rashid ◽  
H.M. Faizan Shakir ◽  
Asra Tariq
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Polyurethane ◽  
Strain Sensors ◽  
Sem Images ◽  
Dynamic Mechanical Thermal Analyzer ◽  
Thermal Analyzer ◽  
Uniform Dispersion ◽  
Polymerization Method

Conducting polymer blends Polyaniline-Dodecylbenzene sulfonic acid (Pani.DBSA) and thermoplastic polyurethane (TPU) were prepared using in-situ emulsion polymerization method by dissolving both components in DMF. Ani.DBSA/TPU blends were prepared with different compositions 20/80, 30/70, 40/60 and 50/50 wt%. Theses blends have good conducting and mechanical properties. Blends were characterized by Potentiostate, Thermogravimetric analysis (TGA), Infrared spectroscopy (FTIR) and Dynamic mechanical thermal analyzer (DMTA). The electrical conductivity increases up to 30 wt% loading of aniline.DBSA after that it decreases gradually. The uniform dispersion of aniline.DBSA showed in SEM images which is the indication of a strong connection between aniline.DBSA and TPU which increase the conductivity. These blends can be used as strain sensors.

Studies in the absorption and excretion of certain minerals by poultry. III. The influence of different levels of dietary calcium upon the retention of calcium, phosphorus, carbonate and chloride

1946 ◽  
Vol 36 (4) ◽  
pp. 283-288 ◽  
Author(s):  
Cyril Tyler
Keyword(s):  
Calcium Carbonate ◽  
Dietary Calcium ◽  
Egg Laying ◽  
Carbonate Content ◽  
Phosphorus Excretion ◽  
Calcium Carbonate Content ◽  
High Calcium ◽  
Calcium Phosphorus ◽  
Different Levels

1. The daily retention of calcium, carbonate, phosphorus and chloride was studied using four birds and changing the calcium carbonate content of the ration every 5 days for 15 days.2. It was shown that high calcium diets result in a much lower retention of calcium and thin-shelled eggs are produced.3. Retention of calcium was higher in the laying than in the non-laying bird when calcium carbonate was fed.4. High calcium diets depressed the retention of phosphorus, and in one case the retention was negative, even when no eggs were laid. Laying birds gave negative values for retention because of the heavy phosphorus excretion associated with egg laying.5. High calcium diets also depressed the retention of chloride, and on occasion led to negative retention values.

Evaluation of the Mechanical Properties of Self-Compacting Lightweight Concrete Exposed to Wet and Dry Cycles in Saltwater

2016 ◽  
Vol 711 ◽  
pp. 218-223
Author(s):  
Sherif Yehia ◽  
Sharef Farrag
Keyword(s):  
Mechanical Properties ◽  
Phase Ii ◽  
Lightweight Concrete ◽  
Experimental Program ◽  
Strength Development ◽  
Sem Images ◽  
Paper Properties ◽  
Two Phases ◽  
Wet And Dry Cycles ◽  
Exposure Conditions

In this paper, properties of a self-compacting lightweight concrete that has been exposed to cycles of wetting in saltwater and drying in air are investigated. Such exposure conditions are common in marine structures with pronounced sea level variation. The experimental program consisted of two phases; Phase I included monitoring of the strength development for 28 days, while in Phase II samples were exposed to wet/dry cycles for 12 months. In addition, control samples were kept in room temperature without exposure for comparison. Compressive and flexural strength, modulus of elasticity and Rapid Chloride Penetration (RCP) were included in the investigation. In addition, Scanning Electron Microscopy (SEM) was conducted to examine the microstructure of the samples in phase II. Results from the experimental program indicate that there was a negligible effect on the mechanical properties or RCP due to the exposure conditions. However, a close inspection of the SEM images showed salt deposits and micro cracking in the cement paste. This may affect the long-term durability and can lead to deterioration of the concrete structure, hence reducing the structure’s service life.

scholarly journals Experimental Study on the Preparation of Calibration Curve for the Measurement of Calcium Carbonate Content Using a Gasometric Method

2021 ◽  
Vol 16 (2) ◽  
pp. 143-157
Author(s):  
Hiroaki SANO ◽  
Mikio YAMADA ◽  
Hirofumi KITAJIMA ◽  
Tukasa KASHIWABARA ◽  
Mikihito FURUKAWA ◽  
...  
Keyword(s):  
Experimental Study ◽  
Calcium Carbonate ◽  
Calibration Curve ◽  
Carbonate Content ◽  
Calcium Carbonate Content
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