Bakteriobójcza aktywność koloidów srebra stabilizowanych hydrolizatami skrobiowymi
oraz ich wpływ na wytrzymałość zapraw cementowych

Sybis, Marta; Konował, Emilia; Modrzejewska‐Sikorska, Anna

doi:10.22630/aspa.2017.16.4.04

Cited by 2 publications

(2 citation statements)

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“…В качестве стабилизатора применяют поливинилпирролидон [6] Cинтез золя серебра основан на восстановлении катионов Ag(I) D-глюкозой при использовании полиэтиленгликоля как стабилизатора. В зависимости от времени перемешивания при 45 °C (3, 6, 24 и 48 ч) получают наночастицы серебра сферической формы со средним диаметром 10, 11, 15 и 25 нм соответственно [15] Золь сферических наночастиц серебра размером 20 нм получают, используя в качестве восстановителей борогидрид натрия, этиловый спирт и аскорбиновую кислоту, а в качестве стабилизатора -лигносульфонаты. Реакционную смесь перемешивают в течение 1 ч. При этом образуются коллоидные системы, стабильные в течение 6 мес.…”

Section: краткое описание источникunclassified

Synthesis of Colloidal Silver Using Lignosulfonates

Plakhin¹,

Khabarov²,

Veshnyakov³

2021

Lesnoy Zhurnal (Forestry Journal)

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Colloidal silver solutions can be used as catalysts for carrying out various chemical transformations of organic substances and solving the problems of disposal of toxic compounds, as well as antibacterial agents for combating pathogenic microflora, in the manufacture of lubricants and light-absorbing materials, coatings, sensors, conductive pastes, and high-performance electrode materials. The research purpose is to study the synthesis of colloidal silver using a solution of technical lignosulfonates (LST) as a stabilizer. Colloidal silver was synthesized as a result of the reduction-oxidation (redox) reaction of Ag(I) cations with glucose at 100 °C in the presence of lignosulfonates. The reaction was carried out in an alkaline medium, which is provided by the addition of ammonia water. Electronic spectroscopy was used to control the synthesis of colloidal silver. After the reaction, the solution turned dark brown and an intense absorption band with a maximum at 400 nm appeared on the electron spectra. The effects of reagent consumption and synthesis duration were studied. It was found that the optimal reagent consumption in the colloidal silver synthesis is as follows: 2.5–5 g glucose / g Ag, 0.3–1 g LST / g Ag, and 3–5 g NH3 / g Ag. The synthesis duration is 2–5 min. The resulting colloidal silver solution is stable for several months. Partial stratification without precipitation is observed during the solution storage. It is shown experimentally that the stratification is followed by a redistribution of colloidal silver particles. Electron spectroscopy confirmed the absence of colloidal silver particles in the upper layer. The reaction kinetics has been studied in experiments carried out under thermostatically controlled conditions at temperatures from 50 to 100 °C. The kinetic dependence is described by a first-order equation at the initial stage of the reaction, the duration of which depends on the temperature. The duration of the active part of the kinetic curves is 15–90 % of the total reaction time. The logarithm of the rate constant on the active section was proved to depend linearly on the reverse thermodynamic temperature (pair correlation coefficient is 0.9887). The activation energy was 47 kJ/mol. For citation: Plakhin V.A., Khabarov Yu.G., Veshnyakov V.A. Synthesis of Colloidal Silver Using Lignosulfonates. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 6, pp. 184–195. DOI: 10.37482/0536-1036-2021-6-184-195

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Section: краткое описание источникunclassified

Synthesis of Colloidal Silver Using Lignosulfonates

Plakhin¹,

Khabarov²,

Veshnyakov³

2021

Lesnoy Zhurnal (Forestry Journal)

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“…In addition, frost-resistance tests conducted on concretes with dextrin admixtures showed improved concrete durability [ 26 ]. Initial studies have also shown that cement composites admixed with dextrin-stabilized colloidal silver have high antimicrobial activity against microorganisms [ 25 , 27 ]. However, the authors showed that the silver nanostructures did not substantially affect the mechanical properties of the cement composites, while the type of starch derivative used was the determining factor in this case.…”

Section: Introductionmentioning

confidence: 99%

Influence of Modified Starch Admixtures on Selected Physicochemical Properties of Cement Composites

Sybis

Konował

2022

Materials

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The conducted research aimed to evaluate the influence of admixtures of various modified starches on the rheological properties of cement composites and their influence on the compressive strength of hardened cement mortars. The study involved 17 different modified starch admixtures. Using a rheometer, the values of viscosity and tangential stresses were determined depending on the shear rate, and were subsequently used to determine the yield point and plastic viscosity of cement slurries. The next parameters tested were the flow of fresh cement slurry and the compressive strength of hardened cement composite. The highest fluidisation was recorded for retentate LU-1420-0.5%Ac-R, an increase of 82%. The conducted tests led to the conclusion that admixing cement composites with modified starches changes the rheological parameters and the compressive strength of cement composites. The highest strength gains occurred for the admixtures of retentate LU-1412-R (increase of 25%). Declines in compressive strength were noticed in the retentate LU-1422-R (decrease by 13%) and the retentate OSA-2.5%-R (decrease of 17%). The admixture of starch hydrolysate significantly decreases the yield point of slurries, which in turn may contribute to the fluidisation of concrete mixes and the reduction of mixing water. The lowest values were obtained for retentates LU-1420-0.5%Ac-R (decrease of 94%), and LU-1412-R (decrease of 93%). It was found that the consistency and compressive strength of cement mortars are affected by both the type of modification and the length of the chemical chain of starch.

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Bakteriobójcza aktywność koloidów srebra stabilizowanych hydrolizatami skrobiowymi oraz ich wpływ na wytrzymałość zapraw cementowych

Cited by 2 publications

References 11 publications

Synthesis of Colloidal Silver Using Lignosulfonates

Synthesis of Colloidal Silver Using Lignosulfonates

Influence of Modified Starch Admixtures on Selected Physicochemical Properties of Cement Composites

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