Dynamics of Polymer Membrane Swelling in Aqueous Suspension of Amino-Acids with Different Isotopic Composition; Photoluminescence Spectroscopy Experiments

Bunkin, N. F.; Bolotskova, Polina N.; Bondarchuk, Elena V.; Gryaznov, V. G.; Козлов, В. А.; Okuneva, Maria A.; Ovchinnikov, O. V.; Penkov, Nikita V.; Smoliy, Oleg P.; Turkanov, Igor F.

doi:10.3390/polym13162635

Cited by 5 publications

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References 34 publications

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“…As is known, the luminescence spectroscopy is an effective technique for the investigation of polymers, see, for example, [16][17][18][19][20]. Certain features of Nafion swelling in various liquids by using this technique were investigated in [21][22][23][24][25]. As shown in [22], the luminescence centers are located on the terminal sulfonic groups.…”

Section: Introductionmentioning

confidence: 99%

Possibility to Alter Dynamics of Luminescence from Surface of Polymer Membrane with Ultrasonic Waves

et al. 2022

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The temporal dynamics of luminescence from the surface of Nafion polymer membranes have been studied. In fact, the polymer membrane was soaked in liquids with different contents of deuterium. The test liquids were ordinary (natural) water (deuterium content equal to 157 ppm) and deuterium-depleted water (deuterium content is equal to 3 ppm). Simultaneously with the excitation of luminescence, the Nafion plate was irradiated with ultrasonic pulses, having a duration of 1 μs. The ultrasonic waves were generated with different repetition rates and amplitudes, and irradiated the surface of Nafion in the geometry of grazing or normal incidence. Luminescence regimes were studied when the membrane was irradiated with one ultrasonic wave (one piezoelectric transducer) or two counter-propagating waves (two piezoelectric transducers). It turned out that ultrasonic waves, which fall normal to the membrane interface, do not affect the dynamics of luminescence. At the same time, in the case of ultrasonic irradiation in the grazing incidence geometry, sharp jumps in the luminescence intensity occur, and the behavior of these jumps substantially depends on the mode of irradiation: one or two piezoelectric transducers. This allows for control of the dynamics of luminescence from the polymer surface. In accordance with this model, the possibility of altering the luminescence dynamics is due to the effect of unwinding the polymer fibers from the surface toward the liquid bulk upon soaking. It is important that such unwinding does not occur in deuterium-depleted water, which was confirmed in a direct experiment with dynamic light scattering from polydisperse aqueous suspensions of Nafion nanometer-sized particles; these suspensions were prepared in ordinary water and deuterium-depleted water. Thus, ultrasonic irradiation affects the dynamics of luminescence only when Nafion is swollen in ordinary water; in the case of deuterium-depleted water this effect is missed.

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Section: Introductionmentioning

confidence: 99%

Possibility to Alter Dynamics of Luminescence from Surface of Polymer Membrane with Ultrasonic Waves

et al. 2022

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Luminescence Intensity ELF Oscillations from a Polymer Membrane in the Aqueous Salt Solutions

et al. 2023

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The paper studies luminescence from the Nafion polymer membrane surface at its swelling in the isotonic aqueous solutions and bi-distilled water using the experimental photo luminescent spectroscopy. Liquid samples were preliminarily treated with the electric pulses with duration of 1 µs and amplitude of 0.1 V using antenna in the form of a flat capacitor. Experiments in photo luminescent spectroscopy were carried out 20 min after the electric pulse treatment. Typical luminescence intensity dependence on the membrane swelling time could be represented as the exponentially decreasing function. Characteristic decay time of the corresponding functions and stationary level of the membrane luminescence intensity depend on the electrical pulses repetition rate. The obtained dependencies could well be reproduced. However, dependence of the luminescence intensity at certain pulse repetition rates appears to be a random function, and the reproducibility is missing. It could be assumed that these stochastic effects are associated with exposure to random external force of the electromagnetic nature acting on the polymer membrane during swelling. Low-frequency pulsations of neutron stars or white dwarfs are the source of this random force according to the authors of the work. This effect is associated with depolarization during the low-frequency electromagnetic field scattering caused by the neutron stars pulsation. Depolarization effect arises due to scattering on long-living anisotropic clusters of nano-bubbles, which, in turn, are becoming anisotropic in the external field of a flat capacitor. Depolarized scattered radiation causes stochastic oscillations of the polymer fibers unwound into the bulk liquid. In this case, luminescence should also acquire the stochastic character taking into account the effect of resonant luminescence energy transfer from a donor to the luminescence acceptor

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Weak pulsed electromagnetic fields enhance potato yield and immunity

Bondarchuk¹,

Ovchinnikov²,

Turkanov³

et al. 2023

Kartofel` I Ovoshi

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Цель исследований: оценка эффективности технологии дистанционной электромагнитной обработки сортов картофеля слабым неионизирующим нетепловым импульсным электромагнитным излучением (ЭМИ). Клубни картофеля отечественных сортов (местной селекции) Печорский и Зырянец перед посадкой подвергали электромагнитному воздействию аппаратом «ТОР-био», в режиме 15/5 (15 минут воздействия, 5 минут перерыв в течение 1 часа перед посадкой) с индивидуальным спектром воздействия. Эффективность воздействия ЭМИ на растения картофеля оценивали на опытных участках Федерального исследовательского центра Коми НЦ УрО РАН. Их площадь составляла 800 м². Посадку картофеля (0,7 × 0,3 м) и сопутствующие полевые наблюдения проводили по стандартным методикам. Почва опытного участка дерново-подзолистая. Агрохимические анализы почвы и химического состава клубней проводили в аттестованных аналитических лабораториях. По результатам исследований 2021–2022 годов, предпосевная обработка клубней ЭМИ способствовала существенному увеличению общей урожайности в сравнении с контрольными (необработанными) вариантами. в условиях Республики Коми более чувствительными к ЭМИ оказались сорта местной селекции. Доказано кратное снижение потерь картофеля, заложенного на длительное хранение, при автоматизированной ежедневной кратковременной дистанционной обработке по технологии «ТОР» помещений хранилища за счет снижения патогенной нагрузки. Доля клубней, пораженных паршой, при зимнем хранении (ноябрь 2021 года по март 2022 года) у обработанного картофеля составила 5% против 14% в контрольной (необработанной) группе. В 2022 году через три недели после уборки картофеля убыль у обработанного картофеля не превышала 2% (1,9%), у контрольного варианта она составляла 9%, у картофеля, выращенного на участке, подготовленном для выращивания сельхозкультур, убыль составляла 5,5%. Убыль массы, обусловленная сухой гилью, за период хранения с ноября 2022 года по апрель 2023 года для обработанного картофеля составляла 0,6%, необработанного – 0,95%. Доля клубней, зараженных паршой, у обработанного картофеля составляла 6%, у необработанного – 13%. The purpose of the research was to evaluate the effectiveness of the technology of remote electromagnetic processing of potato varieties by weak non-ionizing pulsed alternating electromagnetic fields (EMF). Potato tubers (varieties of domestic local selection Pechorsky and Zyryanets) before planting were subjected to electromagnetic exposure using the TOR-bio apparatus, in the 15/5 mode (15 minutes of exposure, 5 minutes break for 1 hour before planting) with an individual spectrum of exposure. Evaluation of the effectiveness of EMF on the yield of potatoes was carried out at the sites of the Institute of Agrobiotechnology of the Federal Research Center of the Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences. The area of the experimental plots was 800 m². Potato planting (0.7 × 0.3 m), as well as field observations of potato plants, were carried out according to the standard generally accepted methodology. The soil of the experimental plot is soddy-podzolic. Soil analyzes were carried in certified analytical laboratories. Pre-planting treatment of tubers with EMF (results of 2021 and 2022 studies) led to a significant increase in overall crop compared to control options. Under the conditions of the Komi Republic, varieties of local selection turned out to be more EMF-sensitive. A multiple reduction in losses of potatoes laid down for long-term storage has been proven with automated daily short-term remote processing using the TOR technology of storage facilities by reducing the pathogenic load. The proportion of tubers affected by scab during winter storage (November 2021 to March 2022) in processed potatoes was 5% versus 14% in the control (untreated) group. In 2022, three weeks after potato harvesting, the decrease in processed potatoes did not exceed 2% (1.9%), in the control variant it was 9%, in potatoes grown on a plot prepared for growing crops, the decrease was 5.5%. The loss of weight due to the dry sleeve for the storage period from November 2022 to April 2023 for processed potatoes was 0.6%, unprocessed – 0.95%. The proportion of tubers infected with scab in processed potatoes was 6%, in unprocessed potatoes – 13%.

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Dynamics of Polymer Membrane Swelling in Aqueous Suspension of Amino-Acids with Different Isotopic Composition; Photoluminescence Spectroscopy Experiments

Cited by 5 publications

References 34 publications

Possibility to Alter Dynamics of Luminescence from Surface of Polymer Membrane with Ultrasonic Waves

Possibility to Alter Dynamics of Luminescence from Surface of Polymer Membrane with Ultrasonic Waves

Luminescence Intensity ELF Oscillations from a Polymer Membrane in the Aqueous Salt Solutions

Weak pulsed electromagnetic fields enhance potato yield and immunity

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