bleaching agents to improve whiteness in minerals

Quartz bleaching by phosphoric acid: An investigation on ...

2021-1-15 · Tuncuk and Akcil (2016) studied the effect of reducing agents in sulphuric acid solution on whiteness response of quartz. It was reported that sulphuric acid bleaching alone and in presence of oxalic acid yielded a 90.6% L* value, while it was 87.8% in presence of citric acid, and was 90.9% in presence of glucose.

Optimization of Bleaching Process

Bleaching clay base minerals. Bentonite minerals have limited sorptive properties in the natural state and require chemical treatment by acids to create the surface area and porosity needed for bleaching vegetable oils. Bleaching clays of this nature are commonly referred to as "acid" or "acid-activated" clays.

Suitable Bleaching Agents for Talc

2021-9-19 · Robert, the bleaching/leaching would be to increase the whiteness of the talc. Currently, the talc is considered to be white or maybe "off-white" in color and my aim is to get it to "brilliant white". Now, these colors should be quantified on a scale (e.g., Hunter) but unfortunately the clients in this part of the world simply use the eye test.

Effect of Optical Brightening Agent (OBA) on Bleaching ...

2014-6-19 · significant. Based on the curves shown in Figure 3, established regression equations presented in Table 3 were established, where whiteness is correlated with the pulp bleached brightness and the dosage of optical brightener applied. As shown in Table 3, OBA can improve significantly the optical properties of pulps of 88%, 90% and 92% ISO.With 2 kg/t OBA (Tinopal EC (S) Liq.) and a …

Effects of bleaching and functionalization of kaolinite on ...

2020-1-29 · The influence of the bleaching process of kaolinite and the intercalation methods on the whiteness index of the nanocomposites was also observed, in which the whiteness index of the functionalized kaolinite nanocomposites was enhanced by up to 10.65% when compared to neat PA6.

Susceptibility of Enamel Treated with Bleaching Agents to ...

2011-8-1 · Bleaching of vital teeth can be achieved by the use of a custom made; vacuum-formed appliance with lower concentrated bleaching gels (10% HP or 10–20% CP) termed "home bleaching." Another method is applying higher concentrations of bleaching gels (30–38% HP or 35–37% CP) directly onto the tooth surface in the dental chair, which is ...

Whiteness improvement of citric acid crosslinked cotton ...

2016-8-20 · Thermogravimetric analysis and Fourier transformed infrared spectroscopy were employed to investigate the reactions. The results revealed that the H2O2 bleaching can effectively improve the whiteness and also maintain a good anti-wrinkle performance of the CA treated fabrics under an appropriate bleaching temperature and time.

In-Office Tooth Bleaching for Adolescents Using Hydrogen

by oxygen released from the bleaching agents that passes through the permeable enamel and dentin, causing harm to the pulp tissue. Kossatz et al. (20) found that the addition of calcium compounds to bleaching gels can help prevent mineral loss and the reduction in microhardness of the enamel caused by the bleaching process, thereby reducing

Determination of optical bleaching agents (Belofors) in ...

Capillary electrophoresis was used for determining Belofors, which are used as optical bleaching agents for improving the whiteness of writing paper. Sodium dodecyl sulfate (SDS) was used as a modifier of capillary walls in the separation of water-soluble Belofors. An optimum buffer electrolyte for separating and determining Belofors was as follows: 0.5 mM sodium hydrogen phosphate, 12.2 mM ...

Effect of high

The aim of this in vitro study was to evaluate enamel microhardness following bleaching treatments using either high- or low-concentration hydrogen peroxide (HP) agents containing calcium and/or fluoride. Sixty enamel blocks were bleached with 1 of 6 different bleaching agents (n = 10). The high-concentration HP agents were Whiteness HP Maxx (35% HP), Whiteness HP Blue (35% HP, 2% calcium ...

Enamel Mineral Content Changes After Bleaching With …

2017-5-1 · Regarding low-concentration hydrogen peroxide bleaching agents, higher concentrations of Ca 11,13,14 and P 11,14 have been observed in the enamel when compared to the high-concentration agents. The present study has shown, however, that both bleaching agents with low hydrogen peroxide concentration have caused a decrease in the concentrations ...

Calcium Carbonate | Imerys

2021-9-24 · The high whiteness and opacity of carbonates lend themselves to a great many applications. In paints and coatings, Imerys calcium carbonates are cost-effective multifunctional fillers that improve whiteness, opacity and matting. They make ideal replacements for titanium dioxide.

BLEACHING TECHNIQUES IN RESTORATIVE DENTISTRY | …

In recent years there has been an increased demand for tooth bleaching in order to improve the whiteness and perceived ... with the bleaching agent: groups 1, 2 and 4 Viva Style Paint on, 8% ...

Preheat-Treatment and Bleaching Agents Affect ...

2020-9-9 · Purpose This study aimed to elucidate the effect of preheat-treatments and bleaching agents on molecular characteristics and bioavailability of obtained bio-calcium. Methods Bio-calcium from Asian sea bass backbone was prepared using different preheat-treatment methods (boiling at 100 °C for 30 min or autoclaving at 121 °C for 90 min). Subsequent bleaching was carried out using 2.5% sodium ...

Bleaching, textile treatment

2014-5-29 · •Increasing the degree of whiteness. 5. Bleaching Agent A bleaching agent is a substance that can whiten or decolorize other substances. 6. Oxidative bleaching The Oxidative bleaching agents are used much more than Reductive bleaching agents . …

Pulp bleaching enzymes promoting whiteness in paper ...

The SUN28 serie is dedicated to the pulp bleaching process, which improves the bleaching efficiency, promotes whiteness, and reduces the amount of bleaching chemicals. Benefit 1. Improve pulp whiteness and inhibit yellowing 2. Improve …

Method of improving the brightness of calcium carbonate ...

Bleaching agents useful in the method of the present invention may be any type of bleaching agent. Bleaching agents especially useful in the method of the present invention are selected from the group consisting of hydrogen peroxide, sodium borohydride, and sodium hydrosulfite. The bleaching agents may be applied as an aqueous solution ...

Pulp Bleaching Technology

2007-3-19 · earliest bleaching agents. Japanese paper makers ... mistakenly equate "whiteness"with brightness, but whiteness is a physiological phenomenon, measured ... fications of the cooking process to improve deligni-fication), and in short bleaching sequences where oxygen is used to supplement chlorine.

How to improve the whiteness of calcium carbonate ...

Therefore, if you want to improve the whiteness of light calcium carbonate, can be in the process of digestion, or carbonization process, or cooked slurry to add reducing agent, complexing agent, such as sodium disulfite, DETA, triethanolamine and other agents compound, whiteness can increase 2 ~ 6%, the finished product whiteness can be ...

Enzymes for bleach boosting in pulp mills | Novozymes

2021-9-26 · Bleaching fiber to improve brightness and whiteness is a time consuming process. It''s also energy and chemical intensive. Common bleaching agents include chlorine dioxide, hydrogen peroxide and caustic soda. Chlorine dioxide usage is associated with chlorinated organic compounds. These affect the quality of your mill''s effluent and can impact ...

Teeth Whitening Strips, Gels, Toothpaste, Bleaching, and …

2021-9-21 · A full course takes between 10 and 14 days. You may need to apply them twice a day. You can buy whitening strips and gels from your pharmacy, dentist, or online for around $10 to $55. Whitening ...

Susceptibility of Enamel Treated with Bleaching Agents to ...

2011-8-1 · Three of the groups were then treated with bleaching agents; 10% CP (Opalescence PF 10% CP, Ultradent Products Inc., South Jordan, USA) (Group 1, n = 10/group), 38% HP (WHITEsmile XTRA 38% HP, Germany) activated with halogen light (Optilux 501, Kerr, USA) (Group 2, n = 10/group), and 38% HP (WHITEsmile XTRA 38% HP, Germany) activated with 810 nm wavelength diode laser …

Susceptibility of enamel treated with bleaching agents to ...

2011-8-1 · Studies have shown that bleaching agents can cause structural alterations on the enamel surface and that the biomechanical properties of the enamel can change [7–17]. Additionally, in vitro studies have shown a close correlation between the bleaching …

Effects of Different Bleaching Agents on the Surface ...

different study designs. and low concentrations of bleaching agents were used, claiming that high concentration may cause further demineralization and compromise the mechanical properties of these mineral-depleted lesions.5,14-17 To the best of our knowledge, the effect of different con-centrations of both in-office and home bleaching agents on

Wool bleaching with reducing agents in the presence of ...

Reductive bleaching with Blankit IN has been shown to provide wool of excellent whiteness, with a lower cysteine content than in the case of bleaching with other reducing agents.

Papermaking

Papermaking - Papermaking - Bleaching and washing: The use of calcium and sodium hypochlorites to bleach paper stock dates from the beginning of the 19th century. In the early days of sulfite pulp manufacture, a single-stage treatment of pulp at low …

Suitable Bleaching Agents for Talc

bleaching agents to improve whiteness in minerals . Skin whitening agents are help to improve texture of skin essential nutrients like vitamins and minerals aur foot,aur face ko kis tarha sa jaldi white Tooth Whitening, Teeth Bleaching due to changes in the mineral fabricate custom fitted whitening trays that will greatly improve . Get Price