Effect of Complex Additives on Ceramic Slip Mobility

Slyusar, O. A.; Uvarov, V. M.

doi:10.1007/s10717-017-9940-1

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…It is an important prerequisite for the slurry to maintain good and stable rheological properties when using tape casting technology to prepare GOS phosphor screens. Solvents and various additives, including dispersants, binders and plasticizers, are the main factors affecting the rheological properties of the slurry [14][15][16][17][18][19][20][21] . The solvent should not only be able to uniformly disperse the powders and other additives, but also have no adverse effect on the powders.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of different additives on the rheological properties of gadolinium oxysulfide slurry prepared for tape casting

Zhang

Kou²,

Guo³

et al. 2023

International Conference on Optoelectronic Materials and Devices (ICOMD 2022)

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Gadolinium oxysulfide (Gd2O2S, GOS) doped with rare earth elements was often used as imaging materials for X-Ray imaging equipment because of its excellent properties of absorbing incident X-rays and converting them into visible light. The flat-panel detector based on the GOS phosphor screen is the core imaging component of the digital radiography. In this paper, GOS slurry was prepared to form phosphor screen by tape casting, and the influence of slurry solvents and different additives on the rheological properties of the slurry was systematically studied. Based on the results of rheological properties, the optimal solid content of the slurry and the optimal addition range of the additives, like dispersants, binders and plasticizers, were determined. The solid content of the slurry is 70%, and the best amount of dispersant is 0.5%~1% of the powder mass. The optimized dosage of binder is 4.5%~7% of the powder mass, and the best plasticizer content is 1.0~1.5 times of the binder content. Then, the GOS fluorescent layer with smooth and flat surface, uniform and controllable thickness, and good bonding ability, was successfully prepared by tape casting the optimized slurry.

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Section: Introductionmentioning

confidence: 99%

Study on the influence of different additives on the rheological properties of gadolinium oxysulfide slurry prepared for tape casting

Zhang

Kou²,

Guo³

et al. 2023

International Conference on Optoelectronic Materials and Devices (ICOMD 2022)

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“…Silicate microfillers are multifunctional -they are effective regulators of rheology [1,2] and kinetics of structure formation of cement and alkali-activated concrete [3][4][5], which can affect their strength and economic parameters [6][7][8][9][10][11]. Nanosized calcium silicates are close to nanosilica and can affect the nucleation rate, the chemical composition of cement hydrosilicates, the degree of their polymerization, and strength characteristics of the modified stone [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of Effectiveness of Calcium Silicate Dispersions Produced Using Sucrose and Lactose as Components of Composite Cement Binder

Shoshin

Строкова

2021

MSF

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Silicate micro- and nano-additives are multifunctional in relation to cement systems. Their application can solve a wide range of technological problems while maintaining the economic efficiency of technical solutions. The effect of silicate additives and fillers is determined by their level of dispersion, due to which the technologies for producing nano- and submicro-sized dispersed materials are being developed. The combination of mechanochemical synthesis of modified calcium hydrosilicates with subsequent thermolysis makes it possible to produce calcium silicate dispersions (SCD), which differ in polymodality of the fractional composition including submicro (10–7–10–6 m) and microdimensional (≥10–6 m) modes. The main element of the technology is the use of modifying carbohydrate, which acts as a stabilizer of hydrated phases of silicates. A comparative study of SCD produced using sucrose (sSCD) and lactose (lSCD) revealed the effect of these carbohydrates on the properties of sSCD and lSCD, as well as their effectiveness as a component of cementitious composite binder. It was found that the level of adsorption of modifying carbohydrate determines the physical properties of SCD (granulometry, specific surface area). The relatively high residual content of free sucrose (0.24%) in the composition of sSCD prevents the consolidation of silicates nanoparticles formed during the thermolysis, causes a high content of submicro sized fractions and a high specific surface area with sSCD (26.3 ± 0.7 m2/g). Lactose is absorbed by the silicate phase; the residual content of free lactose does not exceed 0.028% of lSCD. The low content of stabilizing carbohydrate contributes to the development of nanoparticle consolidation, a decrease in the specific surface area of lSCD to 13.0 ± 0.2 m2/g and content of submicrosized fractions. The residual content of free carbohydrates and particle size characteristics of sSCD and lSCD determine the nature of their influence on Cement-SCD-based concrete setting and hardening. The presence of residual sucrose in the composition of sSCD and fine fractions determines the competitive nature of the processes of retardation of hardening and acceleration of hardening of the cement system due to the nucleation effect, as a result of which the curve of the setting time is extreme. In addition, the inhibitory effect of sucrose reduces the strength of concrete on the 7th day. By the 28th day, the inhibitory effect of sucrose has been overcome, and concrete samples demonstrate an 18% increase in compressive strength with a sSCD content of 30%. The low content of residual free lactose in the composition of lSCD causes the nucleation effect. As a result, there is a monotonous reduction in the setting time of concrete mix with an increase in the content of lSCD in the composition of HF, as well as a significant increase in concrete strength (up to 127%) on the 7th day. At the same time, on the 28th day the strength of concrete increases slightly

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“…Катионы железа в растворе LSA будут координировать с различными лигандами, как низкомолекулярными (молекулы воды, гидроксид-анионы, сульфат-анионы), так и самими лигносульфоновыми кислотами с участием спиртовых и фенольных гидроксильных групп, карбоксильных и сульфогрупп [80]. Координационное число катионов Fe +2 и Fe +3 равно 6, поэтому строение фрагментов LS железа можно представить следующими схемами:…”

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Nitration of Hydrolysis Lignin in Water-Aprotic Solvent Mixtures

Lakhmanov¹,

Хабаров²,

Вешняков³

et al. 2020

Lesnoy Zhurnal (Forestry Journal)

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Industrial lignins are formed from native lignins during chemical or biochemical processing of plant raw materials. Lignins can be modified to produce valuable products, including monomers, polymeric materials, and composites. The article presents the results of a study of hydrolysis lignin nitration under various conditions. The aim of the study was to obtain a nitrated hydrolysis lignin with a maximum yield and maximum nitrogen content. Therefore, the nitration was carried out using nitric acid in a water-aprotic solvent binary mixtures (1,4-dioxane, dimethyl sulfoxide, tetrahydrofuran, dimethylformamide, acetonitrile). Acetyl nitrate, which is a mixed anhydride of nitric and acetic acids, was also used as a nitrating agent. In this regard, the consumption of acetic anhydride in the synthesis of acetyl nitrate was used taking into account the water present in concentrated nitric acid. Acetyl nitrate was obtained by the reaction of acetic anhydride and concentrated nitric acid at room temperature for 30 min. Acetyl nitrate is a mild nitrating agent opposed to nitric acid. Nitration was carried out under reflux in a boiling water bath for 2–5 min (with nitric acid) or 1–60 min (with acetyl nitrate). Upon completion of the nitration reaction, the products were filtered, washed with distilled water and dried to constant weight without heating. When nitration was performed with nitric acid, the maximum yield of nitrated hydrolysis lignin (83–101 %) was achieved using 1,4-dioxane, acetonitrile, and tetrahydrofuran; and the maximum nitrogen content (4.3–4.5 %) was achieved using 1,4-dioxane or acetonitrile. The use of dimethyl sulfoxide and dimethylformamide leads to a decrease in the product yield to 23–35 %, to a lower nitrogen content of 1.3–3.9 % and an increased oxygen content, which indicates the occurrence of not only nitration, but also depolymerization and oxidative transformations. When nitration with acetyl nitrate, the reaction takes place for 1–3 min, herewith the product contains up to 4.7 % of nitrogen. On the IR spectra of nitrated hydrolysis lignins, new absorption bands appear at 1555 and 1710 cm–1 due to the appearance of carboxyl and nitro groups.

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Effect of Complex Additives on Ceramic Slip Mobility

Cited by 5 publications

References 2 publications

Study on the influence of different additives on the rheological properties of gadolinium oxysulfide slurry prepared for tape casting

Study on the influence of different additives on the rheological properties of gadolinium oxysulfide slurry prepared for tape casting

Comparative Assessment of Effectiveness of Calcium Silicate Dispersions Produced Using Sucrose and Lactose as Components of Composite Cement Binder

Nitration of Hydrolysis Lignin in Water-Aprotic Solvent Mixtures

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