Magnetic solvent-free nanofluid based on Fe3O4/polyaniline nanoparticles and its adjustable electric conductivity

2016 ◽  
Vol 4 (37) ◽  
pp. 14392-14399 ◽  
Author(s):  
HaiPeng Bai ◽  
YaPing Zheng ◽  
TianYu Wang ◽  
NingKun Peng
Keyword(s):  
Electrical Conductivity ◽  
Electric Conductivity ◽  
Solvent Free ◽  
Polyaniline Nanoparticles ◽  
First Time

For the first time, we have reported a magnetic, solvent-free nanofluid based on Fe3O4/polyaniline and studied its electrical conductivity.

scholarly journals Solvent-Free Processing of Drug-Loaded Poly(ε-Caprolactone) Scaffolds with Tunable Macroporosity by Combination of Supercritical Foaming and Thermal Porogen Leaching

Polymers ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 159
Author(s):  
Víctor Santos-Rosales ◽  
Inés Ardao ◽  
Leticia Goimil ◽  
Jose Luis Gomez-Amoza ◽  
Carlos A. García-González
Keyword(s):  
Bone Repair ◽  
Drug Loading ◽  
Ammonium Bicarbonate ◽  
Bone Diseases ◽  
Solvent Free ◽  
Bone Integration ◽  
Bioactive Agents ◽  
First Time ◽  
Supercritical Foaming ◽  
Foaming Technology

Demand of scaffolds for hard tissue repair increases due to a higher incidence of fractures related to accidents and bone-diseases that are linked to the ageing of the population. Namely, scaffolds loaded with bioactive agents can facilitate the bone repair by favoring the bone integration and avoiding post-grafting complications. Supercritical (sc-)foaming technology emerges as a unique solvent-free approach for the processing of drug-loadenu7d scaffolds at high incorporation yields. In this work, medicated poly(ε-caprolactone) (PCL) scaffolds were prepared by sc-foaming coupled with a leaching process to overcome problems of pore size tuning of the sc-foaming technique. The removal of the solid porogen (BA, ammonium bicarbonate) was carried out by a thermal leaching taking place at 37 °C and in the absence of solvents for the first time. Macroporous scaffolds with dual porosity (50–100 µm and 200–400 µm ranges) were obtained and with a porous structure directly dependent on the porogen content used. The processing of ketoprofen-loaded scaffolds using BA porogen resulted in drug loading yields close to 100% and influenced its release profile from the PCL matrix to a relevant clinical scenario. A novel solvent-free strategy has been set to integrate the incorporation of solid porogens in the sc-foaming of medicated scaffolds.

Electrical Conductivity of Chloro(phenyl)glyoxime and Its Co(II), Ni(II) and Cu(II) Complexes

2003 ◽  
Vol 68 (7) ◽  
pp. 1233-1242 ◽  
Author(s):  
Orhan Turkoglu ◽  
Mustafa Soylak ◽  
Ibrahim Belenli
Keyword(s):  
Electrical Conductivity ◽  
Temperature Dependence ◽  
Electric Conductivity ◽  
Crystal Structures ◽  
Elemental Analysis ◽  
Analysis Data ◽  
Elemental Analysis Data ◽  
The Stability ◽  
Xrd Patterns ◽  
Metal Ligand

Chloro(phenyl)glyoxime, a vicinal dioxime, and its Ni(II), Cu(II) and Co(II) complexes were prepared. XRD patterns of the complexes point to similar crystal structures. IR and elemental analysis data revealed the 1:2 metal-ligand ratio in the complexes. The Co(II) complex is a dihydrate. Temperature dependence of electrical conductivity of the solid ligand and its complexes was measured in the temperature range 25-250 °C; it ranged between 10-14-10-6 Ω-1 cm-1 and increased with rising temperature. The activation energies were between 0.61-0.80 eV. The Co(II) complex has lower electric conductivity than the Ni(II) and Cu(II) complexes. This difference in the conductivity has been attributed to differences in the stability of the complexes.

An Expert Software for Multi-Layer Coatings Design in Surface Engineering

2008 ◽  
Vol 595-598 ◽  
pp. 583-591 ◽  
Author(s):  
Céline Bondoux ◽  
Christophe Degrandcourt ◽  
George Ailinca ◽  
Pierre D'Ans ◽  
Marc Degrez ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Expert System ◽  
Surface Engineering ◽  
Corrosion And Wear ◽  
Surface Finishing ◽  
Future Developments ◽  
First Time ◽  
Layer Coating ◽  
Main Operation

For the first time, a unique expert system able to give assistance to designers in surface engineering has been built. Not only is this software able to provide multi-layer coating solutions, but it is also able to rank different solutions according to their technico-economical interest. In addition to its ability to solve corrosion and wear concerns, it is also able to deal with surface finishing properties (like brightness, weldability, electrical conductivity, biocompatibility, …). This paper describes the structure of this expert system together with its main operation principles and future developments.

Sustainable Passerini-tetrazole three component reaction (PT-3CR): selective synthesis of oxaborol-tetrazoles

2021 ◽  
Vol 57 (76) ◽  
pp. 9708-9711
Author(s):  
Akansha Singh ◽  
Ravindra Kumar
Keyword(s):  
Solvent Free ◽  
Selective Synthesis ◽  
Three Component Reaction ◽  
First Time

A sustainable catalyst- and solvent-free Passerini-tetrazole three component reaction (PT-3CR) has been developed for the selective synthesis of benzoxaborol-tetrazoles for the first time.

scholarly journals Low-temperature and purification-free stereocontrolled ring-opening polymerisation of lactide in supercritical carbon dioxide

2020 ◽  
Vol 22 (7) ◽  
pp. 2197-2202 ◽  
Author(s):  
Simon P. Bassett ◽  
Andrew D. Russell ◽  
Paul McKeown ◽  
Isabel Robinson ◽  
Thomas R. Forder ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Supercritical Carbon Dioxide ◽  
Ring Opening ◽  
Solvent Free ◽  
Free Ring ◽  
First Time ◽  
Supercritical Carbon

A stereoselective, solvent-free ring-opening polymerisation (ROP) of lactide (LA) in supercritical carbon dioxide (scCO2) is reported for the first time.

scholarly journals Анизотропия анионной проводимости в монокристаллах суперионного проводника CeF-=SUB=-3-=/SUB=-

2021 ◽  
Vol 63 (9) ◽  
pp. 1376
Author(s):  
Н.И. Сорокин ◽  
В.В. Гребенев ◽  
Д.Н. Каримов
Keyword(s):  
Electrical Conductivity ◽  
Atomic Structure ◽  
Unit Cell ◽  
Conductivity Measurements ◽  
Weak Anisotropy ◽  
Tysonite Structure ◽  
Maximum Value ◽  
Anisotropy Effect ◽  
First Time ◽  
Anionic Conductivity

The anisotropy of anionic conductivity in crystals of a superionic conductor CeF3 with the tysonite structure (sp. gr. P-3с1) has been studied for the first time. The conductivity measurements at temperatures from 300 K to 600 K were carried out along the principal a- and c-axes of trigonal unit cell of the crystal. The maximum value of electrical conductivity is observed along the c-axis. The superionic CeF3 crystals have the weak anisotropy of electrical conductivity equal to σ||c/σ||a = 2.4 and σ||c = 5.6 10–4 S/cm at 500 K. The anisotropy effect of anionic conductivity in individual fluorides with the tysonite structure is discussed in connection with the peculiarities of their atomic structure.

scholarly journals Tuning capacitance wire-mesh sensor gains for measurement of conductive fluids

2021 ◽  
Vol 88 (s1) ◽  
pp. s107-s113
Author(s):  
Felipe d. A. Dias ◽  
Philipp Wiedemann ◽  
Marco J. da Silva ◽  
Eckhard Schleicher ◽  
Uwe Hampel
Keyword(s):  
Electrical Conductivity ◽  
Cross Talk ◽  
Tap Water ◽  
Conductivity Measurement ◽  
Wire Mesh ◽  
Energy Losses ◽  
Flow Parameters ◽  
Front End ◽  
Multiphase Fluids ◽  
First Time

Abstract In this paper, the front-end circuit of a capacitance wire-mesh sensor (WMS) is analyzed in detail and a new methodology to tune its feedback gains is reported. This allows, for the first time, a capacitance WMS to be able to provide linear measurements of multiphase fluids with electrical conductivity greater than 100 𝜇S/cm, which is particularly important for tap water, where the conductivity is typically in between 100 S/cm and 500 𝜇S/cm. Experimental and numerical results show that the selected gains using the proposed methodology contribute to suppress cross-talk and energy losses, which in turn, reduces considerably the deviation of the conductivity measurement and the estimation of derived flow parameters, such as local and average phase fraction.

scholarly journals Test the efficiency of mycorrhizal fungi (Glomus fasciculatum) and magnetic water to reduce the effect of salinity on plant onion (Allium cepa L.)

2013 ◽  
Vol 70 (2) ◽  
pp. 325-333
Author(s):  
Faris Mohammed SUHAIL ◽  
Imad Adnan MAHDI
Keyword(s):  
Electrical Conductivity ◽  
Electric Conductivity ◽  
Soil Salinity ◽  
Mycorrhizal Fungi ◽  
Glomus Fasciculatum ◽  
Factorial Experiments ◽  
Water Impact ◽  
Magnetized Water ◽  
Allium Cepa L ◽  
Magnetic Water

We carried out two factorial experiments in pots (capacity 4 kg) in order to increase the salt tolerance  of  one  of  our  important  plant -  onion,  using  inoculation  with  mycorrhizal  fungi  (Glomus fasciculatum) and magnetized water under conditions of salinity stress. The first experiment aims the interaction  between  fungus  inoculation  and  four  levels  of  saline  drainage  water  (0.66,  5.0,  7.5,  10.0 ds/m)  and  the  second  experiment  aims  the  interaction  between  the  inoculation  factor  and  the  water magnetic and two soils with different salinity (5.6, 13.4 ds/m). The results showed that the inoculation with  the  mycorrhizal  fungi  led  to  a  significant  increase  in  height,  fresh  weight  and  dry  weight  of onions  to  all  levels  of  salinity  compared  with  no  addition  of  inoculation,  while  led  to  a  significant reduction in electrical conductivity and the percentage of AM colonization of all levels of salts water. The  treatment  with  inoculation  and  magnetized  water  when  the  salinity  was  13.4  ds.m-1  recorded significant  increase  for  plants  height,  fresh  weight  and  dry  weight  (38.46%,  60.0%,  92.30%) respectively compared to the variant without inoculation, only with addition of water non-magnetized at  the  same  soil  salinity.  The  addition  of  mycorrhizal  fungi  (Glomus  fasciculatum)  and  magnetized water impact significant in reducing the electric conductivity (Ec) in soil salinity (13.4 ds/m) while it affects significantly the percentage of AM colonization in both two soils.

Mechanical Milling and its Influence on Microstructure and Electric Conductivity of High Mass Fraction TiC / Cu Composites

2013 ◽  
Vol 815 ◽  
pp. 790-795
Author(s):  
Jie Yan ◽  
Kai Yong Jiang
Keyword(s):  
Electrical Conductivity ◽  
Relative Density ◽  
Electric Conductivity ◽  
Ball Milling ◽  
Mechanical Milling ◽  
Mass Fraction ◽  
Milling Time ◽  
High Mass ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction

The TiC-Cu composites with different mass fraction were prepared by powder metallurgy method. The effect of ball milling time and sintering temperature on the morphology, relative density and electrical conductivity of TiC/Cu composites has been investigated. As-milled sintered compacts were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and conductivity measurements. The results demonstrate that under laboratory conditions with the milling time increasing grains are remarkable refined. Mechanical milling can bring about changes of lattice parameters, the grain size first decrease and then increase as milling time increasing. Relative density showed strong dependency on the milling time. The effect of the grain being refined by ball milling is helpless to improve electrical conductivity of composites. For the composites with TiC content<50wt.%, as milling time prolonging the electric conductivity decreases while for the 50%TiC-Cu the conductivity are not be impacted.

Comparative Evaluation of Commercial Concentration Procedures for Human Intestinal Parasite Detection

2018 ◽  
Vol 50 (3) ◽  
pp. 243-248 ◽  
Author(s):  
Denis Leméteil ◽  
Gilles Gargala ◽  
Romy Razakandrainibe ◽  
Jean Jacques Ballet ◽  
Loic Favennec ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Comparative Evaluation ◽  
Intestinal Parasite ◽  
Solvent Free ◽  
Parasite Detection ◽  
Parasite Infections ◽  
Stool Specimens ◽  
Concentration Factors ◽  
Commercial Kits ◽  
First Time

AbstractBackgroundEffective stool concentration is essential in microscopically based diagnosis of human intestinal parasite infections.ObjectiveTo compare the performances of 4 concentration commercial kits and 1 homemade procedure in 96 clinical stool specimens that tested positive for the detection of 9 helminth and 8 protozoa parasites.MethodsThe presence or absence of parasite forms was microscopically determined under conditions of standard practice. Also, we established the accuracies, concentration factors, and extraction yields.ResultsNo difference was observed between procedures for preconcentration specimens that tested positive. However, for preconcentration specimens that tested negative, we discovered that the homemade procedure was the most effective, and 2 of the 4 commercial kits were discovered to be satisfactory for routine applications.ConclusionsFor all parasites, procedures with biphasic solvents exhibited higher performances than organic solvent-free procedures. For the first time, the effectiveness of commercial concentration kits has been evaluated on several common stool parasites, and the results suggest that improvement of commercial procedures is possible.

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