scholarly journals Toward a standardization of physico-chemical protocols for nanomedicine characterization: II. Zeta potential measurements

2015 ◽  
Author(s):  
Fanny Varenne ◽  
Jérémie Botton ◽  
Claire Merlet ◽  
Jean-Jacques Vachon ◽  
Sandrine Geiger ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Physico Chemical

scholarly journals Silver Nanoparticles Stabilized with Phosphorus-Containing Heterocyclic Surfactants: Synthesis, Physico-Chemical Properties, and Biological Activity Determination

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1883
Author(s):  
Martin Pisárčik ◽  
Miloš Lukáč ◽  
Josef Jampílek ◽  
František Bilka ◽  
Andrea Bilková ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Biological Activity ◽  
Zeta Potential ◽  
Chain Length ◽  
Alkyl Chain ◽  
Chemical Properties ◽  
Alkyl Chain Length ◽  
Microbial Pathogens ◽  
Physico Chemical ◽  
Phosphorus Containing

Phosphorus-containing heterocyclic cationic surfactants alkyldimethylphenylphospholium bromides with the alkyl chain length 14 to 18 carbon atoms were used for the stabilization of silver nanodispersions. Zeta potential of silver nanodispersions ranges from +35 to +70 mV, which indicates the formation of stable silver nanoparticles (AgNPs). Long-chain heptadecyl and octadecyl homologs of the surfactants series provided the most intensive stabilizing effect to AgNPs, resulting in high positive zeta potential values and smaller diameter of AgNPs in the range 50–60 nm. A comparison with non-heterocyclic alkyltrimethylphosphonium surfactants of the same alkyl chain length showed better stability and more positive zeta potential values for silver nanodispersions stabilized with heterocyclic phospholium surfactants. Investigations of biological activity of phospholium-capped AgNPs are represented by the studies of antimicrobial activity and cytotoxicity. While cytotoxicity results revealed an increased level of HepG2 cell growth inhibition as compared with the cytotoxicity level of silver-free surfactant solutions, no enhanced antimicrobial action of phospholium-capped AgNPs against microbial pathogens was observed. The comparison of cytotoxicity of AgNPs stabilized with various non-heterocyclic ammonium and phosphonium surfactants shows that AgNPs capped with heterocyclic alkyldimethylphenylphospholium and non-heterocyclic triphenyl-substituted phosphonium surfactants have the highest cytotoxicity among silver nanodispersions stabilized by the series of ammonium and phosphonium surfactants.

scholarly journals Influence of Physico-Chemical Parameters on the Fabrication of Silver Nanoparticles Using Petrea volubilis L. Stem Broth and Its Anti-Microbial Efficacy

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
N. I. Hulkoti ◽  
T. C. Taranath
Keyword(s):  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Silver Nitrate ◽  
Microbial Activity ◽  
Contact Time ◽  
Nitrate Concentration ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Vis Spectroscopy ◽  
Silver Nitrate Concentration

In this study we describe the phytofabrication of AgNps through a green route as a cost-effective, instantaneous and an eco-friendly approach using Petrea volubilis L. stem broth. The influence of physico-chemical parameters - contact time, stem broth quantity, pH, temperature, and silver nitrate concentration were studied and optimised to engineer, nanoparticles of diverse sizes. Nanoparticles were characterized by UV-Vis spectroscopy, FTIR, XRD, Zeta potential, EDS, and HRTEM. The characterization using HRTEM showed that, the nanoparticles were spherical and with increase in contact time, stem broth quantity, pH, and temperature, the NPs size minimised whereas escalation in silver nitrate concentration, increased their size. Capping molecules were negatively charged and the NPs were passably stable according to zeta potential readings and they were crystalline as per XRD data. According to FTIR analysis, the bio reduction was attributed to alcohol, ethers, carboxylic acids, and esters. The highest anti-bacterial activity was observed against S. aureus and S. typhi whose ZOI diameter was 13 mm at 100?l in both bacteria. The highest anti-fungal activity of silver nanoparticles was observed against A. flavus whose ZOI diameter was 9 mm at 100?l compared to P. chrysogenum which is 3 mm at 100?l. The stem broth did not show any anti-microbial activity for the microbes. Anti-microbial activity of AgNPs is due to its small size and high surface area. Our findings clearly discloses that sizes of silver nanoparticles can be varied by varying the physico-chemical parameters and the small sized nanoparticles so formed are promising antimicrobial agents and has a great potential in various medical applications.

scholarly journals Biosynthetic potential assessment of four food pathogenic bacteria in hydrothermally silver nanoparticles fabrication

2019 ◽  
Vol 8 (1) ◽  
pp. 629-634 ◽  
Author(s):  
Amir Rahimirad ◽  
Afshin Javadi ◽  
Hamid Mirzaei ◽  
Navideh Anarjan ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Pathogenic Bacteria ◽  
Heating Time ◽  
Synthesis Process ◽  
Ag Nps ◽  
Physico Chemical ◽  
Minimum Particle Size ◽  
Particle Size Analyzer

Abstract Silver nanoparticles (Ag NPs) were synthesized using four pathogenic bacterial extracts namely, Bacillus cereus, E. coli, Staphylococcus aureus and Salmonella entericasubsp.enterica. Synthesis process were hydrothermally accelerated using temperature, pressure and heating time of 121°C, 1.5 bar ad 15 min. Physico- chemical characteristics of the fabricated Ag NPs, including, particle size, polydispersity index (PDI), zeta potential, broad emission peak (λmax) and concentration were evaluated using UV-Vis spectrophotometer and dynamic light scattering (DLS) particle size analyzer. Furthermore, main existed functional groups in the provided bacterial extracts were recognized using Fourier transform infrared spectroscopy. The obtained results revealed that two main peaks were detected around 3453 and 1636.5 cm-1, for all bacterial extracts, were interrelated to the stretching vibrations of hydroxyl and amide groups which those had key roles in the reduction of ions and stabilizing of the formed Ag NPs. The results also indicated that, Ag NPs with much desirable characteristics, including minimum particle size (25.62 nm) and PDI (0.381), and maximum zeta potential (-29.5 mV) were synthesized using S. e. subsp. enterica extract. λmax, absorbance and concentration values for the fabricated Ag NPs with this bacterial extract were 400 nm, 0.202% a.u. and 5.87 ppm.

scholarly journals Compost leachate treatment using polyaluminium chloride and nanofiltration

2017 ◽  
Vol 15 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Marjana Simonič
Keyword(s):  
Zeta Potential ◽  
Isoelectric Point ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Aluminium Chloride ◽  
Leachate Treatment ◽  
Physico Chemical ◽  
Pre Treatment ◽  
Ph Range ◽  
Compost Leachate

AbstractLaboratory scale filtration tests utilizing leachate were conducted to investigate fouling and filtration performance of nanofiltration membranes. The work presented in this study is conducted on real samples rather than model water. Physico-chemical analyses showed that the leachate contained a lot of organic substances, exceeding 20000 mg/L O2 expressed as chemical oxygen demand. Proper pre-treatment method must be chosen in order to reduce fouling index. Coagulation pre-treatment using poly-aluminium chloride was chosen. Two thin film polysulfone membranes were used, purchased by Osmonic Desal. The focus of this research is to assess the influence of the particle size and zeta-potential of the colloidal fraction in leachate on nanofiltration performance. The isoelectric point of both membranes was 4.7 and 4.3, respectively. The fouled membranes were negatively charged over the pH range with isoelectric point shifting to the left (lower pH) indicating the foulant material mainly not charged. It was confirmed by its zeta-potential, measured at -2 mV.

THE DEPENDENCE OF THE PHYSICO-CHEMICAL COMPOSITION OF DRINKING WATER SAMARA FROM THE MAGNITUDE OF ITS ZETA-POTENTIAL

2017 ◽  
Vol 7 (4) ◽  
pp. 38-43
Author(s):  
Viktor I. KICHIGIN ◽  
Valeria V. ZINOVIEVA ◽  
Victor O. ZOLOTENKOV ◽  
Lesya A. ZOTKINA
Keyword(s):  
Drinking Water ◽  
Zeta Potential ◽  
Underground Water ◽  
Surface Source ◽  
Physicochemical Composition ◽  
Physico Chemical ◽  
Artesian Water ◽  
The Individual ◽  
Water Values

The results of studies of physicochemical composition of drinking water and the magnitude of its Zeta potential establishing the degree of dependency of these indicators. Samples were taken in winter and summer. It is shown that variation of values for such parameters as alkalinity, hardness, contents of Ca2+ and Mg2+ slightly on the individual areas of sampling. It is established that values of indic ators of quality of drinking water from underground water intakes was more stable than from a surface source. In artesian water values the Zeta potential (ζ-potential) was 3-7 times lower than in the Volga. The alkalinity of the water year was slightly above winter. There were relations between the value of the Zeta potential and alkalinity of the water as well as turbidity and hardness. In most cases, the magnitude of the accuracy of the approximation was greater than 0.9.

Zeta Potential and Surface Physico-chemical Properties of Atmospheric Air-plasma-treated Polyester Fabrics

2009 ◽  
Vol 79 (15) ◽  
pp. 1371-1377 ◽  
Author(s):  
Lamei Guo ◽  
Christine Campagne ◽  
Anne Perwuelz ◽  
F. Leroux
Keyword(s):  
Zeta Potential ◽  
Chemical Properties ◽  
Air Plasma ◽  
Polyester Fabrics ◽  
Atmospheric Air ◽  
Physico Chemical

scholarly journals Synthesis of β-Glucan nanoparticles from red algae derived β-Glucan for potential biomedical applications

2021 ◽  
Author(s):  
Parthasarathy Ramalingam ◽  
Prabu kumar Seetharaman ◽  
Yashavantha Rao H.C. ◽  
Jayabaskaran Chelliah
Keyword(s):  
Zeta Potential ◽  
Dna Fragmentation ◽  
Colloidal Stability ◽  
Uv Spectroscopy ◽  
Selective Inhibition ◽  
Xrd Analysis ◽  
Water Soluble ◽  
Promising Alternative ◽  
Physico Chemical ◽  
Alternative Drug

Abstract The present study highlighted that the synthesis of β-Glucan nanoparticles (β-GluNPs) developed as a facile method to prevent cancer and infectious diseases, which is highly effective and inexpensive in the biological field. This research study has demonstrated the use of marine algae (Gracilaria corticate) to extract water-soluble β-Glucan and synthesis of β-GluNPs by dissolving the extracted β-Glucan in NaOH under optimal conditions. The molecular structure of the extracted and stabilized β-GluNPs was analysed using NMR. Further, the Physico-chemical parameters of β-GluNPs were analysed by the high throughput instruments like UV spectroscopy, FTIR, DLS, ZETA Potential, SEM, HRTEM, and XRD analysis. The synthesis of β-GluNPs confirmed by IR spectroscopy. The HR-TEM results demonstrated that the formation of polydispersed nanoparticles with a mean size of 20 ± 5 nm. The hydrostatic zeta potential was − 22.7mV, which indicated their colloidal stability. The XRD pattern revealed the crystalline nature of the nanoparticles. Besides, β-GluNPs performed better antibacterial activity against the tested pathogens. The apoptosis and DNA fragmentation observed to be IC50 42.5 µg/ml of the β-GluNPs. The DNA fragmentation assay indicated the selective inhibition of the MCF-7 cell line by DNA damage. Hence, β-GluNPs used as a promising alternative drug against human breast cancer.

scholarly journals Treatment of Wastewater from Pulp and Paper Mill using Coagulation and Flocculation

2020 ◽  
Vol 9 (1) ◽  
pp. 158-163
Keyword(s):  
Zeta Potential ◽  
Oxygen Demand ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Pulp And Paper Mill ◽  
Chemical Parameters ◽  
Coagulation And Flocculation ◽  
Physico Chemical ◽  
Paper Wastewater ◽  
Local Medium

In this work, an effluent sample from a local medium-scale paper mill has been treated using alum as a coagulant and chitosan (natural polymer) as a flocculant. Initially, the dose of alum has been optimized by adjusting the zeta potential to near zero for best coagulation results. The dose of 0.04 g/L was able to merely coagulate and unable to cause sweep flocculation of impurities. Then, at the optimised dose of 0.04 g/L various concentrations of chitosan in the range of 0.1-0.5 g/L were investigated for obtaining maximum flocculation of the suspended impurities. The physico-chemical parameters like pH, total suspended solids (TSS), chemical oxygen demand (COD), absorbance, and zeta potential were studied for comprehending the flocculation behavior. The observed results exhibited that the maximum flocculation was achieved at the chitosan concentration of 0.3 g/L. At the flocculant concentration of 0.3 g/L, 81% TSS removal and maximum 78% COD were reduced. Moreover, zeta potential value of the collected supernatant was close to zero (–1.49 mV) which showed larger floc formation and easy settleability of the impurities. In all, it can be said that the utilization of chitosan along with alum may be a better option for the treatment of pulp and paper wastewater as well as other similar types of wastewater.

scholarly journals Nanoparticle Conjugates of Selenium Compounds: Preparation, Characterisation and Electron Transfer

2020 ◽  
Vol 2 (1) ◽  
pp. 24
Author(s):  
Kavirayani Indira Priyadarsini ◽  
Beena G. Singh ◽  
Prasad P. Phadnis ◽  
Kanhu Charan Barick ◽  
Puthusserickal Abdulrahiman Hassan
Keyword(s):  
Electron Transfer ◽  
Zeta Potential ◽  
Surface Passivation ◽  
Radical Scavenging ◽  
Chemical Properties ◽  
Inorganic Nanoparticles ◽  
Selenium Atom ◽  
Organoselenium Compounds ◽  
Selenium Compounds ◽  
Physico Chemical

One of the important features influencing the biological applications of organoselenium compounds is their redox state, which in turn is affected by their interactions with nearby heteroatoms. To modulate the biological action of selenium in such compounds, researchers have designed new structural motifs and also developed new formulations using inorganic nanoparticles. Metal nanoparticles such as gold nanoparticles (GNPs) and magnetic nanoparticles (MNPs) like iron oxide (Fe3O4) have been extensively studied for conjugation with many heteroatoms (sulphur, nitrogen and oxygen) containing ligands. Selenium, being more polarisable than sulphur, can induce significant surface passivation, thereby providing easy modulations with physico-chemical properties. Considering this, we investigated the physico-chemical properties of a few selenium compounds conjugated to GNPs and MNPs. The GNP conjugates were characterised by spectroscopic and microscopic tools, such as optical absorption, Raman spectroscopy, dynamic light scattering (DLS), the zeta potential and transmission electron microscopy (TEM). The results confirmed that the selenium atom was covalently conjugated to GNPs and this conjugation not only increased their electron transfer ability, but also their antioxidant ability. In another study, asymmetric phenyl selenides were conjugated with MNPs and characterised byX-ray diffraction (XRD), TEM, DLS and zeta potential. The radical scavenging ability of the selenium compounds improved upon conjugation with the MNPs. Therefore, the above studies confirmed that the redox activities of selenium compounds can be modulated upon conjugation with inorganic nanoparticles, such as GNPs and MNPs, which in turn provides new avenues for delivering organoselenium compounds.

scholarly journals Effect of clariflocculator and pulsator based sedimentation technology and poly-aluminium chloride coagulant type on the efficiency of the water treatment plant

2021 ◽  
Author(s):  
Atul Maldhure ◽  
Gajanan Khadse ◽  
Pawan Labhasewar
Keyword(s):  
Water Treatment ◽  
Zeta Potential ◽  
Chemical Properties ◽  
Aluminium Chloride ◽  
Aluminium Concentration ◽  
Hydrolysis Mechanism ◽  
Treated Water ◽  
Water Treatment Plants ◽  
Physico Chemical ◽  
Incremental Addition

Abstract Polyaluminium chloride (PAC) with different basicity is used as a coagulant in most drinking water treatment plants (WTP). The aluminium concentration in PAC and its hydrolysis mechanism varied with the basicity of PAC. Incremental addition of PAC changes various Physico-chemical properties and turbidity removal mechanisms in water. Water treatment plants use the PAC concentration beyond its optimum dose without considering other aspects, including residual aluminium concentration. In the present work, the effect of high and medium basicity of PAC on different Physico-chemical properties like pH, zeta potential, and residual aluminium concentration of water was investigated. The pH of treated water decreases with the incremental addition of PAC, and an increase in zeta potential and residual aluminium concentration in treated water was evidenced. The change in pH after PAC addition is responsible for deciding the coagulation mechanism and efficiency of the coagulation process. pH reduction is comparatively more in high basicity PAC than medium basicity. PAC hydrolysis mechanism is controlled by the zeta potential of water and can be used as an alternative method to decide the optimum coagulant dose. The performance of clariflocculator and pulsator-based WTP was also evaluated for raw water from the same source. To reduce down the turbidity below the acceptable level, the coagulant requirement for clariflocculator based WTP is comparatively less than pulsator based WTP. The floc blanket in the pulsator gets disturbed with a slight change in the coagulant chemistry and quantity.

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