scholarly journals Fiberglass Surface and Its Electrokinetic Properties

1999 ◽  
Vol os-8 (2) ◽  
pp. 1558925099OS-80
Author(s):  
Daojie Dong
Keyword(s):  
Zeta Potential ◽  
Glass Surface ◽  
Important Variable ◽  
Electrokinetic Properties ◽  
Potential Measurement ◽  
Fiber Dispersion ◽  
Basic Concepts ◽  
Electrokinetic Characterization

The surface charge of fiberglass is an important variable for fiber dispersion and web formation in a wet-laid process. This paper presents an overview of the glass surface electrokinetic properties as well as their applications for improving the quality of wet-laid nonwovens through good fiber dispersion and uniform web formation. The paper addresses the basic concepts used in electrokinetic characterization of glass surface and briefly discusses the available techniques for zeta potential measurement.

Electrokinetic Characterization of Two Ascites Tumours: TA3 and M.Mel.1

1973 ◽  
Vol 12 (1) ◽  
pp. 235-251
Author(s):  
CLAUDIA ROEDER ◽  
G.M. W. COOK ◽  
GISELA HAEMMERLI ◽  
P. STRÄULI
Keyword(s):  
Sialic Acid ◽  
Electrophoretic Mobility ◽  
Golden Hamster ◽  
Melanoma Cells ◽  
Ionogenic Groups ◽  
Electrokinetic Properties ◽  
Ascites Tumour ◽  
The Past ◽  
Electrokinetic Characterization

The electrokinetic surfaces of cells of the TA3 ascites tumour of the mouse and the M.Mel, 1 ascites tumour of the golden hamster have been studied for the past 3 years. It became evident that with regard to their electrophoretic mobility (E.P.M.), TA3 cells were stable and melanoma cells were not. Therefore, results discussed in this paper only refer to the melanoma ‘subline’ used for the present investigation. A comparison of the electrokinetic properties of the 2 tumours gives the following information: 1. TA3 and M.Mel, 1 cells have similar E.P.M.s: --1.03 and -1.O5 µm s-1 V-1 cm, respectively. 2. Treatment with 1.5% formaldehyde raises the E.P.M. of TA3 cells by 18% and of M.Mel. 1 cells by 11%. 3. Incubation with neuraminidase lowers the E.P.M. of TA3 cells by 46% and of M.Mel. 1 cells by 24%. 4. Consecutive treatment with formaldehyde/neuraminidase and with neuraminidase/formaldehyde produces identical pH-mobility profiles for TA3 and M.Mel. 1 cells. Further, the electrokinetic data suggest that in addition to anionogenic groups, cationogenic groups are present on the surfaces of both TA3 and M.Mel. 1 cells. Mitotic indices and E.P.M.s of standard washed and neuraminidase-treated M.Mel. 1 cells, examined on consecutive days after implantation, indicate a continuous loss of sialic acid from the electrokinetic surface during the progress of a transplantation passage. These results are discussed with regard to the significance attributed to ionogenic groups at the surface of normal and neoplastic cells by other authors.

Fabrication and Characterization of Sr0.7Ca0.3TiO3 Substrates Using Aqueous Tape Casting Process

2010 ◽  
Vol 434-435 ◽  
pp. 275-277
Author(s):  
Wei Liang Liu ◽  
Shuo Qi Liu ◽  
Du Song Mao
Keyword(s):  
Zeta Potential ◽  
Ph Value ◽  
Tape Casting ◽  
Casting Process ◽  
Solid Loading ◽  
Potential Measurement ◽  
Binder Ratio ◽  
Rheological Test ◽  
Test Result

Sr0.7Ca0.3TiO3 (SCT) substrates were prepared through aqueous tape casting. Properties of SCT slurries with and without ammonium polyacrylate (NH4PAA) dispersant were characterized by zeta potential. The zeta potential measurement result shows that the isoelectric point (IEP) of the powder changed obviously with the addition of the dispersant. The optimum pH value of the slurry is in the range of 9-10. The rheological test result indicates that the proper content of the dispersant is between 0.6 and 0.8 wt%. The effect of different plasticizer/binder ratio (R) on the properties of the green tapes was investigated. For 56 wt% solid loading, the tensile strength of the green tape reached 2.02 MPa and the breaking elongation rate was about 8%. SEM micrographs show that the microstructure of the green tapes is homogeneous and the microstructure of the sintered tapes is dense.

scholarly journals Synthesis of 8-Hydroxyquinoline/exchanged montmorillonite hybrids: Sorption, Luminescence and Thermal stability studies

2020 ◽  
Vol 10 (5) ◽  
pp. 516
Author(s):  
Besma Mellah ◽  
Thouraya Turki ◽  
Wafa Chammam ◽  
Ezzedine Srasra
Keyword(s):  
Thermal Stability ◽  
Methylene Blue ◽  
Zeta Potential ◽  
Room Temperature ◽  
Cationic Dye ◽  
Stability Studies ◽  
Simple Metal ◽  
Potential Measurement ◽  
Ph Range

<p>Hybrids (H) prepared from 8-Hydroxyquinoline (8-HQ, "oxine") and exchanged montmorillonites (Na(I)-, Zn(II)- and Fe(III)-Mont) have been synthesized using solid-solid reactions at room temperature. The characterization of these hybrids by PPXRD has shown that the interlayer spaces swell (from 0.22 to 1.10 Å of d<sub>001 </sub>differences) after the inclusion of 8-HQ due to its complexation with the cations present. In the IR spectra, new bands corresponding to 8-HQ groups, appear in the regions 1244 - 1608 cm<sup>-1</sup> and 574 - 826 cm<sup>-1</sup>. DSC measurement has shown the hybrids to be more stable than the precursor montmorillonites, 8-HQ and the simple metal oxinates. Zeta potential measurement on suspensions of the hybrids showed them to be negatively charged over the whole pH range (pH=2-10). As an application of our elaborated hybrids, sorption of the cationic dye methylene blue MB (C<sub>MB</sub>=200 mg.L<sup>-1</sup>) by the Na(I)-, Zn(II)- and Fe(III)-hybrids has been found to be rapid for the first two. At the same time, for the Fe(III) species, one month of sedimentation was required to adsorb 87 % of MB. The structural characterization of multi-hybrids MH (H+MB) by PXRD has shown a shift of d<sub>001</sub> to higher values (Na-MH: 15.32 Å; Zn-MH: 16.61 Å; Fe-MH: 16.99 Å), signifying the intercalation of MB into interlayer spaces.<strong></strong></p>

How to use alum with cationic dispersed rosin size

TAPPI Journal ◽  
2016 ◽  
Vol 15 (5) ◽  
pp. 331-335 ◽  
Author(s):  
LEBO XU ◽  
JEREMY MYERS ◽  
PETER HART
Keyword(s):  
Zeta Potential ◽  
Colloidal Particles ◽  
Streaming Potential ◽  
Excessive Amount ◽  
Paper Machine ◽  
Optimum Amount ◽  
Potential Measurement ◽  
Streaming Current ◽  
Wide Range ◽  
Laboratory Results

Retention of cationic dispersed rosin size was studied via turbidity measurements on stock filtrate with different alum and dispersed rosin size dosages. Stock charge characteristics were analyzed using both an analysis of charge demand determined via a streaming current detector and an evaluation of zeta potential of the fibers by streaming potential measurement. The results indicated that an optimum amount of alum existed such that good sizing retention was maintained throughout a wide range of dispersed rosin size dosages. However, when an excessive amount of alum was used and fines and colloidal particles were transitioned from anionic to cationic, the cationic size retention was reduced. Laboratory results were confirmed with a paper machine trial. All data suggested that a stock charge study was necessary to identify optimal alum dosage for a cationic dispersed rosin sizing program.

Incorporation of micro/nanoparticles of PCL with essential oil of Cymbopogon nardus in bacterial cellulose

2018 ◽  
Vol 1 (2) ◽  
pp. 37
Author(s):  
Aline Krindges ◽  
Vanusca Dalosto Jahno ◽  
Fernando Morisso
Keyword(s):  
Particle Size ◽  
Particulate Matter ◽  
Essential Oil ◽  
Zeta Potential ◽  
Bacterial Cellulose ◽  
Culture Medium ◽  
Static Culture ◽  
Cymbopogon Nardus ◽  
Cellulose Membranes

Incorporation studies of particles in different substrates with herbal assets growing. The objective of this work was the preparation and characterization of micro/nanoparticles containing cymbopogon nardus essential oil; and the incorporation of them on bacterial cellulose. For the development of the membranes was used the static culture medium and for the preparation of micro/nanoparticles was used the nanoprecipitation methodology. The incorporation of micro/nanoparticles was performed on samples of bacterial cellulose in wet and dry form. For the characterization of micro/nanoparticles were carried out analysis of SEM, zeta potential and particle size. For the verification of the incorporation of particulate matter in cellulose, analyses were conducted of SEM and FTIR. The results showed that it is possible the production and incorporation of micro/nanoparticles containing essential oil in bacterial cellulose membranes in wet form with ethanol.

Physicochemical and bacteriological characterization of hospital effluents and their impact on the environment

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Human Health ◽  
Fecal Coliforms ◽  
Chemical Pollution ◽  
Hospital Effluents ◽  
Biological Contaminants ◽  
Almost All ◽  
Direct Discharge ◽  
Significant Chemical

Liquid effluents discharged by hospitals may contain chemical and biological contaminants whose main source is the different substances used for the treatment of patients. This type of rejection can present a sanitary potentially dangerous risk for human health and can provoke a strong degradation of diverse environmental compartments mainly water and soils. The present study focuses on the quality of the liquid effluents of Hassani Abdelkader’s hospital of Sidi Bel-Abbes (West of Algeria). The results reveal a significant chemical pollution (COD: 879 mgO2/L, BOD5: 850 mgO2/L, NH4+ : 47.9 mg/l, NO2- : 4.2 mg/l, NO3- : 56.8 mg/l with respect to WHO standard of 90 mgO2/L, 30 mgO2/L, 0.5 mg/l, 1 mg/l and 1 mg/l respectively). However, these effluents are biodegradable since the ratio COD/BOD5 do not exceeded the value of 2 in almost all samples. The presence of pathogen germs is put into evidence such as pseudomonas, the clostridium, the staphylococcus, the fecal coliforms and fecal streptococcus. These results show that the direct discharge of these effluents constitutes a major threat to human health and the environment.

scholarly journals Proteomic Advances in Milk and Dairy Products

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3832
Author(s):  
Rubén Agregán ◽  
Noemí Echegaray ◽  
María López-Pedrouso ◽  
Radwan Kharabsheh ◽  
Daniel Franco ◽  
...  
Keyword(s):  
Dairy Products ◽  
Two Dimensional Gel Electrophoresis ◽  
Vast Number ◽  
Post Translational Modifications ◽  
Fundamental Parameters ◽  
Complex Fluid ◽  
Proteins And Peptides ◽  
Milk And Dairy Products

Proteomics is a new area of study that in recent decades has provided great advances in the field of medicine. However, its enormous potential for the study of proteomes makes it also applicable to other areas of science. Milk is a highly heterogeneous and complex fluid, where there are numerous genetic variants and isoforms with post-translational modifications (PTMs). Due to the vast number of proteins and peptides existing in its matrix, proteomics is presented as a powerful tool for the characterization of milk samples and their products. The technology developed to date for the separation and characterization of the milk proteome, such as two-dimensional gel electrophoresis (2DE) technology and especially mass spectrometry (MS) have allowed an exhaustive characterization of the proteins and peptides present in milk and dairy products with enormous applications in the industry for the control of fundamental parameters, such as microbiological safety, the guarantee of authenticity, or the control of the transformations carried out, aimed to increase the quality of the final product.

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