scholarly journals The Packing State of Pigment-Mixture Systems of Titanium Dioxide with Calcium Carbonate

1974 ◽  
Vol 47 (11) ◽  
pp. 527-534
Author(s):  
Yuzo YASUDA ◽  
Masatsuyo MARUO
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate

Calcium carbonate and titanium dioxide particles as a basis for container fabrication for brain delivery of compounds

2011 ◽  
Vol 440 (1) ◽  
pp. 165-167 ◽  
Author(s):  
T. V. Bukreeva ◽  
I. V. Marchenko ◽  
T. N. Borodina ◽  
I. V. Degtev ◽  
S. L. Sitnikov ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Brain Delivery

Study on Synthesis of Zirconolite Using Simulated Radioactive Incineration ASH

2012 ◽  
Vol 482-484 ◽  
pp. 1703-1706
Author(s):  
Yu Xi Piao ◽  
Ming Fen Wen ◽  
Ji Chen ◽  
Jian Chen Wang
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Energy Saving ◽  
Zirconium Dioxide ◽  
Preparation Method ◽  
Raw Materials ◽  
Phase Assemblage ◽  
Solid Reaction ◽  
X Ray ◽  
Intermediate Products

The minerals of zirconolite doping simulated radioactive incineration ash were fabricated by solid reaction, using zirconium dioxide, titanium dioxide, calcium carbonate or CaTiO3 as raw materials. The phase assemblage was tested by X-ray diffractometer. TG-DSC was tested by SDT-Q600. Compared to carbonate preparation method, using intermediate products (CaTiO3) preparation method to synthesis CaZrTi2O7 is more energy saving.

scholarly journals Study on Ultrafine Particles Used in Drilling Fluids

2020 ◽  
Vol 319 ◽  
pp. 05002
Author(s):  
X C Cao ◽  
C. Y. Zhou ◽  
Y. Y. Li ◽  
W Zong ◽  
J Wang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Ultrafine Particles ◽  
Drilling Fluids ◽  
Viscosity Property ◽  
Water Base

In this paper, several ultrafine particles were prepared and characterized, then the performance of drilling fluids were evaluated after ultrafine particles were added in water base drilling fluids. The viscosity property of drilling fluids were increased, however, filtration reduction could not be strictly controlled. All filtration volume was difficult to control just like common ultrafine calcium carbonate unless some polymers could be used. Titanium dioxide and zinc dioxide could be used as substitutes of calcium carbonate in drilling fluids.

scholarly journals ABRASIVOS: UMA ANÁLISE DE DENTIFRÍCIOS COMERCIALIZADOS EM SALVADOR

2015 ◽  
Vol 5 (3) ◽  
Author(s):  
Lydia De Brito Santos ◽  
Ana Carla Ferreira Rios ◽  
Viviane Maia Barreto Oliveira ◽  
Sônia Cristina Freitas Lemos Lopes ◽  
Taiana Silva Dantas
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Aluminum Oxide ◽  
Sodium Bicarbonate ◽  
Silicon Dioxide ◽  
Color Change ◽  
Tooth Surface ◽  
The Public ◽  
The City

Most toothpastes sold in Brazil contains abrasive composition with the function of preventing the formation of spots or pigmented film and burnish the tooth surface, however, the indiscriminate use of abrasives has generated discussion regarding the effects of this component. Objective: To evaluate dentifrices sold in the city of Salvador as to its commercial presentation, regarding the inormation contained in the packages related to abrasives, in order to verify if guidelines are offered to the public to assist them in choosing those products and to the professionals when it comes to the guiding elements of the prescription. Methodology: We have analyzed 45 packages of toothpaste, randomly purchased from supermarkets in Salvador, for two years. We have observed the following: component that guides the classification of toothpaste, type and concentration of abrasive and instructions with respect to the degree of abrasiveness. Results: All trademarks contained abrasive analyzed singly or in combination; eight types of abrasives have been found: Calcium Carbonate (27%), Silica (26%), Sodium Bicarbonate, Silicon Dioxide, Titanium Dioxide, trisodium phosphate, aluminum oxide and sodium silicate. Manufacturers have associated to the dentifrices naturals extracts with the purpose to prevent the dental color change without tooth and gengival aggression caused by abrasives associations. Conclusion: Lack of guidance on packaging about the level of abrasiveness of toothpaste that can guide patients and professionals to its rational use.

Utilisation of Titanium and Titanium Dioxide as Scaffolds for Proliferating Coral Reef

2021 ◽  
Vol 1016 ◽  
pp. 1497-1502
Author(s):  
Masato Ueda ◽  
Chihiro Sawatari ◽  
Tomoyuki Takahashi ◽  
Hiroaki Tsuruta ◽  
Hidenobu Tokushige ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Coral Reef ◽  
Calcium Carbonate ◽  
Coral Reefs ◽  
Artificial Seawater ◽  
Inorganic Substance ◽  
Restoration Techniques ◽  
Surface Modified ◽  
Dioxide Film ◽  
Planula Larva

Estimated 30 percent or more of coral reefs are now in danger of extinction by coastal construction increases and global temperatures rise. Several restoration techniques such as fragmentation, forming, Biorock have been developed in the past few years. In vertebrates such as mammals, osteoblast is known to form the bones composed of hydroxyapatite. Therefore, bone substitutional devices are generally surface modified to improve the adhesion of osteoblasts on the surfaces. Titanium dioxide film is often employed as the surface material for hard tissue substitutes made of titanium and its alloys. In hard corals, on the other hand, the soft tissue covered on the skeletons made of calcium carbonate has osteoblasts as well. The purpose of this work was to investigate the potential of titanium (Ti) and titanium dioxide (TiO2) as scaffolds for proliferating coral reefs by analysing the several interfacial reactions. The rods of pure Ti were anodised in aqueous phosphoric acid at a constant voltage of 80 V. The surfaces were confirmed to be anatase type TiO2. The coral fragments were kept in contact with the rods in a lab-scale aquarium with artificial seawater for several days. The colony of polyps vigorously expanded on the surfaces. Fragments of coral were placed on pure Ti, TiO2 coated pure Ti in Petri dishes and were reared in artificial seawater. Fine spherical precipitates of calcium carbonate with aragonite structure, which is the same inorganic substance as corals, were observed radially and regularly on the surfaces of TiO2. In addition, the adherence of planula larva to the sputtered TiO2 film was observed by using a QCM (Quartz Crystal Microbalance) method. The approach and adhesion of planula larva to the surface could be detected by monitoring the resonance frequency and resistance. The surfaces might have a great potential in coral reef regenerations.

Flow patterns in calcium carbonate and titanium dioxide filled polyethylene in the entrance region of a capillary die

1985 ◽  
Vol 6 (4) ◽  
pp. 215-221 ◽  
Author(s):  
Chin-Yuan Ma ◽  
James L. White ◽  
Frederick C. Weissert ◽  
Kyonsuku Min
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Flow Patterns ◽  
Entrance Region

scholarly journals The Adsorption of Cement Superplasticizers on to Mineral Dispersions

1989 ◽  
Vol 6 (4) ◽  
pp. 219-231 ◽  
Author(s):  
A. Pierre ◽  
R. Mercier ◽  
A. Foissy ◽  
J.M. Lamarche
Keyword(s):  
Molecular Weight ◽  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Electrostatic Interaction ◽  
Calcium Ion ◽  
Ph Value ◽  
Aqueous Media ◽  
Melamine Formaldehyde ◽  
Maximum Coverage ◽  
Adsorption Desorption

The adsorption of polymeric sulphonated naphthalene formaldehyde (SNF) and sulphonated melamine formaldehyde (SMF) on to titanium dioxide and calcium carbonate has been measured in aqueous media. The magnitude of these adsorptions is strongly dependent on electrostatic interaction irrespective of the pH value. This result has been established by studying the adsorption of the polyelectrolytes from solutions of different composition. The calcium ion plays a prominent role in the process of adsorption, especially at high pH where electrical interactions do not favour the reaction. The polymeric nature of the fluidizing agents is demonstrated by an increase in adsorption with molecular weight and by adsorption/desorption experiments where the reaction has been shown to be irreversible. The amount adsorbed at maximum coverage does not depend on the nature of the mineral, but mainly on electrical interactions between the monomer units.

scholarly journals Assessment of Influence and Threshold Ratios of Titanium Dioxide and Calcium Carbonate as Pigments on the Physico-Mechanical Properties of Emulsion Paint

2019 ◽  
Vol 3 (Issue 1) ◽  
Author(s):  
A.A Raheem ◽  
O.A Olowu ◽  
A.E. Aladeloba ◽  
A.A Hungbo ◽  
A.Y Akinsanya
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Specific Gravity ◽  
Low Cost ◽  
Skin Irritation ◽  
Drying Time ◽  
Adhesion Properties ◽  
Emulsion Paint ◽  
Surface Drying

Titanium dioxide (TiO2) also known as Titanium White, is an inorganic, synthetic pigment used in paint to protect the substrate from harmful effects of ultraviolet light when lead pigments are regarded as toxic. However, its use is being limited since it causes flu-like symptoms, respiratory problem and skin irritation. Calcium carbonate (CaCO3) is a chemical commonly used as an extender pigment in cement to provide bulkiness at relatively low cost. Because of the problem associated with TiO2, it is of importance to regulate and optimize the use of TiO2 relative to CaCO3 and their influence on the physico-mechanical properties of emulsion paints. Nine paint specimens were formulated using 0 – 80 grams per litre of TiO2 and 120 – 200 grams of CaCO3, respectively at 10 gram interval. The following tests were performed on them: specific gravity, viscosity, pH, surface drying time, hard drying time, wash-ability/adhesion and opacity tests, in accordance to Nigerian Industrial Standard (NIS) 278: 1990. The result shows that all samples met specifications of 10 poise maximum, 5%, 7.5-9.0, 20 minutes, 2 hours, and 201 minimum, for viscosity, specific gravity, pH, surface drying time, hard drying time and wash-ability/adhesion properties, respectively. However, six sample specimens only met the requirement of NIS 278:1990 of 2coats for good opacity. In conclusion, TiO2 has no negative effect on the other physio-mechanical properties except the opacity of the paint and so specimens 7, 8 and 9, and ratio 30:170 is considered the threshold values for the paint production.

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