scholarly journals Properties and Use of Water Activated by Plasma of Piezoelectric Direct Discharge

2021 ◽  
Vol 8 ◽  
Author(s):  
Evgeny M. Konchekov ◽  
Alexey P. Glinushkin ◽  
Valery P. Kalinitchenko ◽  
Konstantin V. Artem’ev ◽  
Dmitry E. Burmistrov ◽  
...  
Keyword(s):  
Exposure Time ◽  
Ph Value ◽  
Nitrate Concentration ◽  
Synergetic Effect ◽  
Emission Spectra ◽  
Atmospheric Plasma ◽  
Nitrate Anion ◽  
Value Change ◽  
Physical And Chemical ◽  
Direct Discharge

The distilled water was exposed to a cold atmospheric plasma (CAP) generated by the piezotransformer. The treatment was carried out on a six-well plate. Exposure time was from 30 s to 10 min. The emission spectra were obtained. Physical and chemical changes of activated water were observed for 8 days. The reactive oxygen and nitrogen species (RONS) were investigated. RONS production dependence on the exposure time and RONS lifetime in the treated liquid was determined using absorbance spectra. Quantitative assessment was made of the nitrite and nitrate concentration change over time after treatment. The medium conductivity and redox potential varied linearly depending on exposure time. The pH value change correlates with nitrate anion concentration. The concentration of peroxide hydrogen increased depending on CAP water treatment duration. The RONS concentration after liquid media processing with piezoelectric direct discharge CAP is a novel result. Biogeosystem Technique provides CAP activated water agriculture synergetic effect.

scholarly journals Investigate the corrosion properties of stellite coated on AZ91D alloy by plasma spray technique

2021 ◽  
pp. 209-209
Author(s):  
Mathivanan Kannan ◽  
Thirumalaikumarasamy Duraisamy ◽  
Thirumal Pattabi ◽  
Ashokkumar Mohankumar
Keyword(s):  
Exposure Time ◽  
Regression Models ◽  
Ph Value ◽  
Corrosion Behaviour ◽  
Chloride Ion ◽  
Atmospheric Plasma ◽  
Ion Concentration ◽  
Corrosion Properties ◽  
Component Manufacturing ◽  
Plasma Sprayed

Stellite alloys are primarily preferred in various component manufacturing industries due to its magnificent mechanical and electrochemical properties. The stellite powder is deposited over the materials by Various thermal spray methods in industries. This research proposed investigating the microstructure and corrosion properties of stellite powder that is deposited on an AZ91D magnesium alloy substrate by atmospheric plasma spraying process. SEM, optical microscopy, and atomic force microscopy are typical of the coatings. Immersion experiments in sodium chloride conditions are conducted at varying pH levels, chloride ion concentration, and exposure time. In addition, XRD examined the phase change properties of the powder and sprayed condition of coatings along with corrosion testing. The corrosion experiments were conducted to establish several regression models based on the central composite design and the response surface process. The accuracy of the regression models was sufficient to allow correlations between input parameters and responses through variance analysis. It was found that the pH value significantly influences the corrosion behaviour of stellite coatings followed by other parameters such as chloride ion concentration and exposure time; even in corrosion tests, plasma-sprayed coatings performed better.

scholarly journals The synergistic effect of Canady Helios cold atmospheric plasma and a FOLFIRINOX regimen for the treatment of cholangiocarcinoma in vitro

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Olivia Jones ◽  
Xiaoqian Cheng ◽  
Saravana R. K. Murthy ◽  
Lawan Ly ◽  
Taisen Zhuang ◽  
...  
Keyword(s):  
Cell Viability ◽  
Chemotherapy Regimen ◽  
Synergetic Effect ◽  
Atmospheric Plasma ◽  
High Recurrence Rate ◽  
Cold Atmospheric Plasma ◽  
Tract Cancer ◽  
Anticancer Properties ◽  
Potential Interactions

AbstractCholangiocarcinoma (CCA) is a rare biliary tract cancer with a low five-year survival rate and high recurrence rate after surgical resection. Currently treatment approaches include systemic chemotherapeutics such as FOLFIRINOX, a chemotherapy regimen is a possible treatment for severe CCA cases. A limitation of this chemotherapy regimen is its toxicity to patients and adverse events. There exists a need for therapies to alleviate the toxicity of a FOLFIRINOX regimen while enhancing or not altering its anticancer properties. Cold atmospheric plasma (CAP) is a technology with a promising future as a selective cancer treatment. It is critical to know the potential interactions between CAP and adjuvant chemotherapeutics. In this study the aim is to characterize the efficacy of FOLFIRINOX and CAP in combination to understand potential synergetic effect on CCA cells. FOLFIRINOX treatment alone at the highest dose tested (53.8 µM fluorouracil, 13.7 µM Leucovorin, 5.1 µM Irinotecan, and 3.7 µM Oxaliplatin) reduced CCA cell viability to below 20% while CAP treatment alone for 7 min reduced viability to 3% (p < 0.05). An analysis of cell viability, proliferation, and cell cycle demonstrated that CAP in combination with FOLFIRINOX is more effective than either treatment alone at a lower FOLFIRINOX dose of 6.7 µM fluorouracil, 1.7 µM leucovorin, 0.6 µM irinotecan, and 0.5 µM oxaliplatin and a shorter CAP treatment of 1, 3, or 5 min. In conclusion, CAP has the potential to reduce the toxicity burden of FOLFIRINOX and warrants further investigation as an adjuvant therapy.

scholarly journals A review of the current understanding of nanoparticles protein corona composition

2020 ◽  
Author(s):  
Pranvera Breznica ◽  
Rozafa Koliqi ◽  
Arlinda Daka
Keyword(s):  
Protein Binding ◽  
Exposure Time ◽  
Protein Corona ◽  
Current Understanding ◽  
Biological Medium ◽  
Chemical Characteristics ◽  
Physical And Chemical Characteristics ◽  
Different Types ◽  
Physical And Chemical ◽  
Universal Protein

Upon entering into the biological environments, the surface of the nanoparticles is immediately coated with proteins and form the so-called a protein corona due to which a nanoparticle changes its "synthetic" identity to a new "biological" identity. Different types of nanoparticles have different protein binding profiles, which is why they have different protein corona composition and therefore it cannot be said that there is a universal protein corona. The composition and amount of protein in the corona depends on the physical and chemical characteristics of the nanoparticles, the type of biological medium and the exposure time. Protein corona increases the diameter but also changes the composition of the surface of the nanoparticles and these changes affect biodistribution, efficacy, and toxicity of the nanoparticles.

scholarly journals Additions concentration of encapsulant on biang clone purple sweet potatoes "chips" as natural dye powder

2018 ◽  
Vol 1 (2) ◽  
pp. 1
Author(s):  
Hari Hariadi ◽  
Marleen Sunyoto ◽  
Bambang Nurhadi ◽  
Agung Karuniawan
Keyword(s):  
Experimental Method ◽  
Sweet Potato ◽  
Ph Value ◽  
Natural Dye ◽  
Concentration Addition ◽  
Anthocyanin Pigment ◽  
Sweet Potatoes ◽  
Total Anthocyanin ◽  
Purple Sweet Potato ◽  
Physical And Chemical

The purpose of this study was to obtain maltodextrin with the appropriate concentration of purple sweet potato anthocyanin extract to produce the natural dye powder preparations with the best physical and chemical characteristics. The research method used is Experimental Method (Experimental Method) by using Group Random Design (GRD). The experiment consisted of three treatments and each was repeated four times, with the treatment obtained in cassava purple with a concentration of 35.4 mg / 100gr anthocyanin extract.  The  next  stage  was  to  determine  the  best  concentration  of  maltodextrin Consisting of four treatments and each repeated three times. The anthocyanin pigment powder of purple sweet potato with various treatments of maltodextrin concentration addition gave a significant effect on the soluble time, and yield, but did not gave a significant effect on total of anthocyanin, hygroscopicity and solubility. The treatment 10% of maltodextrin concentration addition resulted in best characteristic with total anthocyanin of 48.43 mg / L, color intensity L * (brightness) of 37.86, a * (redness) of 43.66, b * (yellow) of 21.68, water content of 5.56%, hygroscopicity of 11.62%, solubility of  97.13%, soluble time of 159 seconds, pH value of 3.04, and yield of 31.38%. The resulting anthocyanin powder shows that the anthocyanin pigment powder of purple sweet potato with the maltodextrin concentration addition has the potential to serve as a natural dye powder for food and beverages.

scholarly journals Dispersion and Intersection of Hydrothermal Plumes in the Manus Back-Arc Basin, Western Pacific

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Zhigang Zeng ◽  
Xiaoyuan Wang ◽  
Bramley J. Murton ◽  
Haiyan Qi ◽  
Berit Lehrmann ◽  
...  
Keyword(s):  
Water Column ◽  
Ph Value ◽  
Chemical Properties ◽  
Hydrothermal Systems ◽  
Pacmanus Hydrothermal Field ◽  
Different Depths ◽  
Hydrothermal Plumes ◽  
Back Arc ◽  
Physical And Chemical ◽  
Fluid Sources

The composition of hydrothermal plumes reflects the physical and chemical characteristics of seafloor hydrothermal fluids, which in turn reflects the host rock and subseafloor reaction conditions as well as the water column processes that act to alter the plumes as they disperse and age. Here, we show that the turbidity, current, pH value, dissolved Fe (dFe), and dissolved Mn (dMn) compositions of hydrothermal plumes can be used to understand the spatial distribution and source of hydrothermal systems in the submarine geological environment. Data were obtained from 18 hydrocast stations, among which the water column samples were collected at 8 stations during the MANUS cruise of R/V KEXUE in 2015. The results showed that the Satanic Mills plume and Fenway plume rose approximately 140 m and 220 m above the seafloor, respectively. In the Satanic Mills plume, dFe remained longer than dMn during lateral plume dispersal. There was a clear intersection of the Satanic Mills plume and Fenway plume between 1625 m and 1550 m in the PACMANUS hydrothermal field, and the varied dispersion trends of the mixed plumes were affected by current velocities at different depths. The physical and chemical properties of the seawater columns in the Manus Basin were affected by the input of high-Mn, high-Fe, and low-Mg vent fluids. The turbidity and dFe, dMn, and dissolved Mg concentrations in the sections of the plumes proximal to the Satanic Mills, Fenway, and Desmos vent sites were generally higher (turbidity, Mn, and Fe) and lower (Mg) than those in the sections of the plumes that were more distal from the vent sites. This implied that the plumes proximal to their vent fluid sources, which were interpreted to have relatively young ages, dispersed chemically over time, and their concentrations became more similar to those of the plumes that were more distal from their vent fluid sources.

scholarly journals Evaluation of treatment and disinfection of water using cold atmospheric plasma

2016 ◽  
Vol 14 (4) ◽  
pp. 609-616 ◽  
Author(s):  
Zohreh Rashmei ◽  
Hamid Bornasi ◽  
Mahmood Ghoranneviss
Keyword(s):  
Atmospheric Plasma ◽  
Bacterial Inactivation ◽  
Electrical Fields ◽  
E Coli ◽  
Colony Forming Units ◽  
Escherichia Coli Bacteria ◽  
Physical And Chemical ◽  
Inactivation Of Bacteria ◽  
Number Of Bacteria ◽  
Research Show

In this paper, the disinfection of water is investigated using plasma spark treatment and the results are compared with conventional techniques. Inactivation of the Enterococcus faecalis and Escherichia coli bacteria is considered in the treatment process of water by the plasma spark. For this purpose, many physical and chemical parameters of water are measured and the obtained results demonstrate a reduction of 8-log in colony forming units of E. coli and E. faecalis at 15 minutes and 12 minutes, respectively. The results of this research show that no ozone is produced during the plasma spark treatment. Moreover, inactivation of a large number of bacteria without any change of pH shows that pH is not the cause of the bacterial inactivation. It is concluded that the main causes of the inactivation of bacteria in the treated water are H2O2 molecules and the electrical fields generated by plasma.

scholarly journals Effect of ettringite morphology on the properties of expanding cement systems

2019 ◽  
Vol 110 ◽  
pp. 01037 ◽  
Author(s):  
Igor Kharchenco ◽  
Vyacheslav Alekseev
Keyword(s):  
Crystallization Process ◽  
Ph Value ◽  
Cement Stone ◽  
Chemical Research ◽  
Concrete Composition ◽  
Building Site ◽  
Reaction Solution ◽  
Physical And Chemical ◽  
Ready Mixed Concrete ◽  
Micro Fillers

The effect of the pH of the reaction solution on the crystallization process and the ettringite morphology is theoretically substantiated and experimentally proved. Using physical and chemical research methods, the dependence of the morphology of crystallizing ettringite on the pH value of the reaction solution was established. It has been established that by introducing mineral micro fillers into the composition of expanding cement, it is possible to actively influence the pH value, the morphology of the resulting ettringite, the expansion kinetics, and the strength of cement stone and concrete based on it. The studies of the technical properties of concrete on the basis of expanding cements of various types have shown that with the introduction of micro fillers into the concrete composition, which intensify volume expansion during hydration of cement stone at the building site or factories for the production of ready-mixed concrete, it is possible to control the kinetics and extent of expansion, expansion pressure, deformative and strength characteristics of concrete and reinforced concrete structures.

Influence of pH on the Absorption and Fluorescence Spectra of 6,7-Dihydroxycoumarin in Aqueous Solution

1982 ◽  
Vol 37 (3) ◽  
pp. 262-265 ◽  
Author(s):  
Jerzy Grzywacz ◽  
Stanisława Taszner
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Ph Value ◽  
Emission Spectra ◽  
Excited Singlet ◽  
Acid Base ◽  
Wide Ph Range ◽  
Ph Range ◽  
Influence Of Ph

Abstract Absorption and emission spectra of 6,7-dihydroxycoumarin [6,7-DHC] in aqueous solution over a wide pH range are reported. The absorption spectra proved to be strongly sensitive to the pH-value of the solution, whereas the emission spectra change in this range only insignificantly. An interpretation is attempted on the basis of the differences of the acid-base properties of the 6,7-DHC molecule in its ground and excited singlet state. For this purpose the pKa's and pKax's values have been calculated. It has been stated that in the excited state the phototautomer form is very unlikely.

Effect of artificial saliva contamination on pH value change and dentin bond strength

2003 ◽  
Vol 19 (5) ◽  
pp. 429-434 ◽  
Author(s):  
Noriko Hiraishi ◽  
Yuichi Kitasako ◽  
Toru Nikaido ◽  
Satoshi Nomura ◽  
Michael F Burrow ◽  
...  
Keyword(s):  
Bond Strength ◽  
Ph Value ◽  
Artificial Saliva ◽  
Value Change ◽  
Saliva Contamination

Strong Down-Conversion Emission of Sm3+ Doped Borotellurite Glass under 480 nm Excitation Wavelength

2016 ◽  
Vol 705 ◽  
pp. 204-208
Author(s):  
Siti Nasuha Rafien ◽  
Azman Kasim ◽  
Azhan Hashim ◽  
S. Akmal Syamsyir ◽  
Mardhiah Abdullah ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Emission Spectra ◽  
Ultra Violet ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Physical Parameters ◽  
Tellurite Glasses ◽  
Physical And Chemical ◽  
Down Conversion ◽  
And Chemical Properties

Tellurite glasses were generally applied in rare earth optical materials due to their excellent in physical and chemical properties. In this study, tellurite glasses composed of (70-x)TeO2-20B2O3-10ZnO-xSm2O3 (x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %) were prepared by conventional melt-quenching technique. Some basic physical parameters such as density, molar volume and oxygen packing density as well as the optical analysis by mean of their absorption and emission spectra have been carried out at room temperature using UV/Vis and photoluminescence spectrophotometer. The result of physical properties are found to vary with respect to concentration of Sm3+ ions content. Meanwhile, three strong absorption peaks are observed and are well resolved in the ultra violet and visible regions due to transitions between the ground state and various excited state of Sm3+ ions. Under 480nm laser excitation, luminescence spectra exhibit four emission bands at 562 nm, 599 nm, 645 nm and 706 nm which corresponding to the transition 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2 were observed. Some other results were also been analysed and presented.

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