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Partager le résultat de cette recherche Interroger des sources externesEtude de l'évolution microstructurale au cours de la croissance des revetements de nitrures , analyse par MEB-EDX-EBSD / Fatima-Zohra Mammeri
Titre : Etude de l'évolution microstructurale au cours de la croissance des revetements de nitrures , analyse par MEB-EDX-EBSD Type de document : texte imprimé Auteurs : Fatima-Zohra Mammeri ; N. Rouag, Directeur de thèse ; Univ. de Constantine, Éditeur scientifique Année de publication : 2007 Importance : 102 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Texture Films minces MEB CrN et CrAIN Pulvérisation magnétron EDX EBSD Index. décimale : 530 Physique En ligne : ../theses/physique/MAM4834.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3488 Etude de l'évolution microstructurale au cours de la croissance des revetements de nitrures , analyse par MEB-EDX-EBSD [texte imprimé] / Fatima-Zohra Mammeri ; N. Rouag, Directeur de thèse ; Univ. de Constantine, Éditeur scientifique . - 2007 . - 102 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Texture Films minces MEB CrN et CrAIN Pulvérisation magnétron EDX EBSD Index. décimale : 530 Physique En ligne : ../theses/physique/MAM4834.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3488 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité MAM/4834 MAM/4834 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration et caracterisation des couches minces d’oxyde de zinc et sulfure de zinc preparees par spray ultrasonique Type de document : texte imprimé Auteurs : Lilia Baghriche, Auteur ; Mohamed Salah Aida, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 119 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Couches Minces ZnO ZnS Spray molarité propriétés optiques propriétés
électriques DRX MEB goutte impactant la tension superficielle Thin films Molarity DRX Optical properties Electrical
properties The droplet impact The surface tension الشرائح الرقيقة أكسيد الزنك كبريتات الزنك الرش المجهر الماسح قطرات الرذاذ مولارية الخصائص الضوئية الخصائص الكهربائية التوتر السطحيIndex. décimale : 530 Physique Résumé : The present work deals with the preparation and the characterization of zinc oxide (ZnO) and zinc sulfide (ZnS) thin films by ultrasonic spray. Our goal is to carry a comprehensive study on the effect of the deposition parameters (substrate temperature and the nature of the precursor solution (zinc acetate and zinc nitrate) for ZnO, molarity and the nature of the precursor solution (zinc nitrate and zinc chloride) for ZnS) on the physical properties of zinc oxide and zinc sulfide thin films.
X-ray diffraction (XRD ) analysis reveals that at low temperature the films are
composed of nanocrystallites with a privileged orientation depending on the precursor nature;these orientations are along the plane (100) for the films deposited with zinc acetate and along (002) for films prepared with zinc nitrate precursor. However, with increasing deposition temperature, the privileged orientation disappears. The scanning electron microscopy (SEM) observations suggest that the liquid droplets react once they reach the substrate surface when zinc acetate precursor is used. However, in the case of zinc nitrate solution, the droplets spread first on the substrate surface followed by the subsequent surface
reaction. The surface tension of the starting solution controls the shape of the droplet impact and thereafter the film microstructure.
The ZnS thin films have an amorphous structure at 300°C. The growth rate is closely
related to the sulfide molarity and to the nature of the starting solution. It increases with sulfide molarity for both used solutions. MEB and optical microscope surface observations reveal that the increasing in sulphide molarity yields to denser and rougher films regardless the used precursors. The RMS value increase with an increase in sulfide molarity for the two precursors. The analysis of the transmittance spectra in the visible range allows us to deduce the optical band gap and disorder of ZnS thin films. The transparency in our films was more than 70% for the two precursors and absorption edge shifts towards blue with the decreasing
of the molarity of sulfide from 0,05 to 0.02mol/l is shown for Zinc chloride.
The electrical conductivity of zinc oxide and zinc sulfide thin films was deduced from transport measurement using two probes coplanar structure.Diplôme : Doctorat en sciences En ligne : ../theses/physique/BAG6807.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10060 Elaboration et caracterisation des couches minces d’oxyde de zinc et sulfure de zinc preparees par spray ultrasonique [texte imprimé] / Lilia Baghriche, Auteur ; Mohamed Salah Aida, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 119 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Couches Minces ZnO ZnS Spray molarité propriétés optiques propriétés
électriques DRX MEB goutte impactant la tension superficielle Thin films Molarity DRX Optical properties Electrical
properties The droplet impact The surface tension الشرائح الرقيقة أكسيد الزنك كبريتات الزنك الرش المجهر الماسح قطرات الرذاذ مولارية الخصائص الضوئية الخصائص الكهربائية التوتر السطحيIndex. décimale : 530 Physique Résumé : The present work deals with the preparation and the characterization of zinc oxide (ZnO) and zinc sulfide (ZnS) thin films by ultrasonic spray. Our goal is to carry a comprehensive study on the effect of the deposition parameters (substrate temperature and the nature of the precursor solution (zinc acetate and zinc nitrate) for ZnO, molarity and the nature of the precursor solution (zinc nitrate and zinc chloride) for ZnS) on the physical properties of zinc oxide and zinc sulfide thin films.
X-ray diffraction (XRD ) analysis reveals that at low temperature the films are
composed of nanocrystallites with a privileged orientation depending on the precursor nature;these orientations are along the plane (100) for the films deposited with zinc acetate and along (002) for films prepared with zinc nitrate precursor. However, with increasing deposition temperature, the privileged orientation disappears. The scanning electron microscopy (SEM) observations suggest that the liquid droplets react once they reach the substrate surface when zinc acetate precursor is used. However, in the case of zinc nitrate solution, the droplets spread first on the substrate surface followed by the subsequent surface
reaction. The surface tension of the starting solution controls the shape of the droplet impact and thereafter the film microstructure.
The ZnS thin films have an amorphous structure at 300°C. The growth rate is closely
related to the sulfide molarity and to the nature of the starting solution. It increases with sulfide molarity for both used solutions. MEB and optical microscope surface observations reveal that the increasing in sulphide molarity yields to denser and rougher films regardless the used precursors. The RMS value increase with an increase in sulfide molarity for the two precursors. The analysis of the transmittance spectra in the visible range allows us to deduce the optical band gap and disorder of ZnS thin films. The transparency in our films was more than 70% for the two precursors and absorption edge shifts towards blue with the decreasing
of the molarity of sulfide from 0,05 to 0.02mol/l is shown for Zinc chloride.
The electrical conductivity of zinc oxide and zinc sulfide thin films was deduced from transport measurement using two probes coplanar structure.Diplôme : Doctorat en sciences En ligne : ../theses/physique/BAG6807.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10060 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BAG/6807 BAG/6807 Thèse Bibliothèque principale Thèses Disponible
Titre : La synthèse des nano poudres de Cu O avec la méthode précipitation Sol-Gel en utilisant le précurseurCuSO4 et l’étude de leurs propriétés structurales et optiques Type de document : texte imprimé Auteurs : Sara Mehadjebi, Auteur ; Abderrahmane Chaieb, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 93 f. Format : 30 cm. Note générale : 2 copies imprimes disponibles . Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Sciences des Matériaux Semi Conducteurs
CuO sol gel DRX MEB infra rouge absorption méthodes de synthèses sol-gel process UV-Visible spectroscopy the infrared
spectroscopy(IR) methods of analysis أكسيد الحديد صول جول الشرائح الرقيقة طرق التحضيرIndex. décimale : 530 Physique Résumé : The Sol-Gel method is a very attractive technique for elaborating materials, since it is known to be
able to synthesize ,at low temperature ,both nanometric powders or materials with fine
microstructure .moreover, it ensures a high chemical purity and homogeneity and also controls ,in
an accurate manner ,the morphology of the synthesized materials .
In the present work we have fabricated and characterized pure copper oxide powders “CuO” and its
composite thin film (CuO/PMMA)by sol-gel process (wet-chemistry route) using two different
precursor (CuSO4+5H2 O) and (Cu(CH3 COO)2 ,H2 O) .
Various analysis techniques have been used to characterize the CuO powders and its composites
thin films, they are divided into two category:
The structural analysis including the X-rays diffraction (XRD),the infrared
spectroscopy(IR)and the electron scanning microscopy (MEB).
UV-Visible spectroscopy has been used for the determination of optical gap.
For the CuO prepared by the first precursor (CuSO4+5H2 O) and with different annealing
temperatures ,the study by X-rays diffraction (DRX) reveals single phase monoclinic structure of
CuO ,the average crystallite size change with annealing temperature .
For the CuO prepared by the second precursor (Cu(CH3 COO)2 ,H2 O) the study by X-rays
diffraction (XRD),reveals single phase monoclinic structure of CuO ,the average crystallite size of
the powder annealed to 450℃ is 16,76nm.
The study of optical properties of the CuO/PMMA composite thin films by the two methods has
shown a band gap is estimated to be 3.91eV.
Diplôme : Magistère En ligne : ../theses/physique/MEH6842.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10117 La synthèse des nano poudres de Cu O avec la méthode précipitation Sol-Gel en utilisant le précurseurCuSO4 et l’étude de leurs propriétés structurales et optiques [texte imprimé] / Sara Mehadjebi, Auteur ; Abderrahmane Chaieb, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 93 f. ; 30 cm.
2 copies imprimes disponibles .
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Sciences des Matériaux Semi Conducteurs
CuO sol gel DRX MEB infra rouge absorption méthodes de synthèses sol-gel process UV-Visible spectroscopy the infrared
spectroscopy(IR) methods of analysis أكسيد الحديد صول جول الشرائح الرقيقة طرق التحضيرIndex. décimale : 530 Physique Résumé : The Sol-Gel method is a very attractive technique for elaborating materials, since it is known to be
able to synthesize ,at low temperature ,both nanometric powders or materials with fine
microstructure .moreover, it ensures a high chemical purity and homogeneity and also controls ,in
an accurate manner ,the morphology of the synthesized materials .
In the present work we have fabricated and characterized pure copper oxide powders “CuO” and its
composite thin film (CuO/PMMA)by sol-gel process (wet-chemistry route) using two different
precursor (CuSO4+5H2 O) and (Cu(CH3 COO)2 ,H2 O) .
Various analysis techniques have been used to characterize the CuO powders and its composites
thin films, they are divided into two category:
The structural analysis including the X-rays diffraction (XRD),the infrared
spectroscopy(IR)and the electron scanning microscopy (MEB).
UV-Visible spectroscopy has been used for the determination of optical gap.
For the CuO prepared by the first precursor (CuSO4+5H2 O) and with different annealing
temperatures ,the study by X-rays diffraction (DRX) reveals single phase monoclinic structure of
CuO ,the average crystallite size change with annealing temperature .
For the CuO prepared by the second precursor (Cu(CH3 COO)2 ,H2 O) the study by X-rays
diffraction (XRD),reveals single phase monoclinic structure of CuO ,the average crystallite size of
the powder annealed to 450℃ is 16,76nm.
The study of optical properties of the CuO/PMMA composite thin films by the two methods has
shown a band gap is estimated to be 3.91eV.
Diplôme : Magistère En ligne : ../theses/physique/MEH6842.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10117 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité MEH/6842 MEH/6842 Thèse Bibliothèque principale Thèses Disponible
Titre : Caractérisation du pouvoir entartrant des eaux dures et inhibition du tartre par voie électrochimique et chimique. Type de document : texte imprimé Auteurs : Rayane Menzri ép Louaira, Auteur ; Samira Ghizellaoui, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 209 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement Carbonate de calcium Traitement antitartre MgCl2 RPI2000 (polyacrylate) RS1600 (vitamines B1 et B6) Chronoampérométrie Impédancemétrie Méthode chimique IR RX Raman MEB Antiscaling treatment RS1600 (vitamins B1 and B6) Chronoamperometry Impedancemetry Chemical method SEM كربونات الكالسيوم العلاج المضاد للتكلس التقنية الكهروكيميائية للتكلس السريع تقنية قياس المقاومة الأشعة تحت الحمراء الأشعة السينية رامان الطيفي الميكروسكوب الالكتروني للمسح
RS1600(فيتامينات B1 و B6)Index. décimale : 540 Chimie et sciences connexes Résumé :
The ground water Hamma rich in calcium and bicarbonate likely to deposit the tartar and
subsequently lead to the obstruction of the pipes and the seizing of the stopping devices in addition to the financial losses resulting therefrom. It is therefore necessary to optimise an antiscaling treatment in order to avoid the risk of formation of tartar deposits in the various installations, and to protect the equipment in contact with this water. Three chemical inhibitors were tested: MgCl2, polyacrylate, and RS1600. The latter is a new green inhibitor that would allow the formation of tartar to be delayed. It is a mixture of vitamins B1 and B6 with a percentage of 50 % for each. To optimise the effective concentration of each product, we used two electrochemical methods (chronoamperometry and impedance) and three chemical methods (rapid controlled precipitation, the technique of degassing CO2 by agitation and technique of CO2 degassing by nitrogen sparge) to identify the best inhibitor and the best method for optimizing antiscaling treatment by chemical inhibition. The results obtained showed that the method of precipitation of calcium carbonate by degassing CO2 by agitation is the most effective method because the coefficient of oversaturation that is reached is closer to the real case avoiding thereafter the overestimation of inhibitors. This study also showed that it is possible to classify the chemical inhibitors according to their efficacy against the formation of calcium carbonate. All methods used revealed that RPI2000 is the most effective inhibitor. IR, RX, Raman spectroscopy, and SEM indicate that the raw waters of Hamma give precipitates in the form of calcite (the most stable form), with the presence of a small amount of magnesian calcite and aragonite. In the presence of the three inhibitors, calcium carbonate changes morphology to other forms that do not exist in the deposit obtained from the raw water (vaterite and calcium carbonate monohydrate).
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/MEN7512.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11348 Caractérisation du pouvoir entartrant des eaux dures et inhibition du tartre par voie électrochimique et chimique. [texte imprimé] / Rayane Menzri ép Louaira, Auteur ; Samira Ghizellaoui, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 209 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement Carbonate de calcium Traitement antitartre MgCl2 RPI2000 (polyacrylate) RS1600 (vitamines B1 et B6) Chronoampérométrie Impédancemétrie Méthode chimique IR RX Raman MEB Antiscaling treatment RS1600 (vitamins B1 and B6) Chronoamperometry Impedancemetry Chemical method SEM كربونات الكالسيوم العلاج المضاد للتكلس التقنية الكهروكيميائية للتكلس السريع تقنية قياس المقاومة الأشعة تحت الحمراء الأشعة السينية رامان الطيفي الميكروسكوب الالكتروني للمسح
RS1600(فيتامينات B1 و B6)Index. décimale : 540 Chimie et sciences connexes Résumé :
The ground water Hamma rich in calcium and bicarbonate likely to deposit the tartar and
subsequently lead to the obstruction of the pipes and the seizing of the stopping devices in addition to the financial losses resulting therefrom. It is therefore necessary to optimise an antiscaling treatment in order to avoid the risk of formation of tartar deposits in the various installations, and to protect the equipment in contact with this water. Three chemical inhibitors were tested: MgCl2, polyacrylate, and RS1600. The latter is a new green inhibitor that would allow the formation of tartar to be delayed. It is a mixture of vitamins B1 and B6 with a percentage of 50 % for each. To optimise the effective concentration of each product, we used two electrochemical methods (chronoamperometry and impedance) and three chemical methods (rapid controlled precipitation, the technique of degassing CO2 by agitation and technique of CO2 degassing by nitrogen sparge) to identify the best inhibitor and the best method for optimizing antiscaling treatment by chemical inhibition. The results obtained showed that the method of precipitation of calcium carbonate by degassing CO2 by agitation is the most effective method because the coefficient of oversaturation that is reached is closer to the real case avoiding thereafter the overestimation of inhibitors. This study also showed that it is possible to classify the chemical inhibitors according to their efficacy against the formation of calcium carbonate. All methods used revealed that RPI2000 is the most effective inhibitor. IR, RX, Raman spectroscopy, and SEM indicate that the raw waters of Hamma give precipitates in the form of calcite (the most stable form), with the presence of a small amount of magnesian calcite and aragonite. In the presence of the three inhibitors, calcium carbonate changes morphology to other forms that do not exist in the deposit obtained from the raw water (vaterite and calcium carbonate monohydrate).
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/MEN7512.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11348 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité MEN/7412 MEN/7412 Thèse Bibliothèque principale Thèses Disponible
Titre : Contribution a l'étude des procèdes électrochimiques d'adoucissement des eaux dures Type de document : texte imprimé Auteurs : Yasmina Boulahèib (Née Bendaoud), Auteur ; Samira Ghizellaoui, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 187 f. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Entartrage traitement chimique PCR chronoampérométrie impédancemétrie MEB KH2PO4 Polyphosphates HEDP Scaling chemical treatment chronoamperometry impedance SEM تكلس معالجة كيميائية الترسب المراقب السريع الكرونوأمبيرومترية مقاومة ميكروسكوب الكتروني للمسح Index. décimale : 540 Chimie et sciences connexes Résumé : Treating hard water has been interest from several works in order to reduce the adverse consequences of tartar. Hard water deposits form compact and adherent to the walls of pipes and industrial or domestic installations (GHIZELLAOUI, 2006).
Our study focuses on softening hard water Hamma having a hardness of 59°F and Negrine with a hardness of 56°F in the presence of KH2PO4, polyphosphates and HEDP.
The evaluation and the inhibition of scaling of hard waters of Hamma and Negrine were carried out by using four methods:
- The chemical method for evaluating the effective concentration of inhibitor to reduce the hardness of waters of Hamma and Negrine at temperature sources 30°C while maintaining a residual calcium concentration of 1 00 mg/L.
- The method of rapid precipitation controlled to track the phenomenon of germination growth during the formation of the deposit of calcium carbonate.
- The electrochemical method of accelerated scaling to assess the scaling power of raw waters of Hamma and Negrine by electrochemical way and in the presence of chemical inhibitors (KH2PO4, polyphosphates and HEDP );
- electrochemical method for measuring impedances of precipitated deposits metal deposit calcium carbonate
- electrolyte interface enables an overall assessment by means of the highfrequency resistance , adhesion and the importance of filing carbonate calcium ( Khalil et al.1993).
-The effect of inhibitors on the morphology and adhesion of the deposit of calcium carbonate was observed by the scanning electron microscope SEM and RX.
The application of chemical treatment of the waters of Hamma and Negrine at temperature of 30°C showed that partial inhibition of hardness requires addition of 2 mg/L of KH2PO4 for Hamma and 3 mg/L for Negrine. By against, the use of the polyphosphates inhibits scaling at a concentration of 10 mg/L for Hamma water and 5 mg/L for Negrine water.
The HEDP effect is at a concentration of 1 00 mg/L for Hamma and 50 mg/L for Negrine.
These values are reduced using the method of rapid controlled precipitation for each of the three inhibitors (0.1 mg/L KH2PO4, 0.01 mg/L Polyphosphates or 0.01 mg/L HEDP) for water of Hamma, and (0.5 mg/L KH2PO4, 1 mg/L Polyphosphates or 0.01 mg/L HEDP ) for water of Negrine.
The chronoamperometric study shows that the scaling time increases with the addition of (0.1 mg/L KH2PO4, 0.04 mg/L Polyphosphates or 0.005 mg/L HEDP ) for Hamma water and (0.5 mg/L KH2PO4, 0.25 mg/L Polyphosphtes or 10-5 mg/L HEDP) for Negrine water.
The impedance measurement obtained from the raw waters of Hamma and Negrine compared to treated waters shows a decrease in the amount of calcium carbonate scale as well as its adhesion by measuring high frequency resistors deposits from addition of (0.01 mg/L KH2PO4, 0.01 mg/L Polyphosphates or 0.005 mg/L HEDP) for Hamma also (0.5 mg/L KH2PO4, 0.05 mg/L Polyphosphates or 0.0075 mg/L HEDP) for Negrine.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU6778.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9831 Contribution a l'étude des procèdes électrochimiques d'adoucissement des eaux dures [texte imprimé] / Yasmina Boulahèib (Née Bendaoud), Auteur ; Samira Ghizellaoui, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 187 f.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Entartrage traitement chimique PCR chronoampérométrie impédancemétrie MEB KH2PO4 Polyphosphates HEDP Scaling chemical treatment chronoamperometry impedance SEM تكلس معالجة كيميائية الترسب المراقب السريع الكرونوأمبيرومترية مقاومة ميكروسكوب الكتروني للمسح Index. décimale : 540 Chimie et sciences connexes Résumé : Treating hard water has been interest from several works in order to reduce the adverse consequences of tartar. Hard water deposits form compact and adherent to the walls of pipes and industrial or domestic installations (GHIZELLAOUI, 2006).
Our study focuses on softening hard water Hamma having a hardness of 59°F and Negrine with a hardness of 56°F in the presence of KH2PO4, polyphosphates and HEDP.
The evaluation and the inhibition of scaling of hard waters of Hamma and Negrine were carried out by using four methods:
- The chemical method for evaluating the effective concentration of inhibitor to reduce the hardness of waters of Hamma and Negrine at temperature sources 30°C while maintaining a residual calcium concentration of 1 00 mg/L.
- The method of rapid precipitation controlled to track the phenomenon of germination growth during the formation of the deposit of calcium carbonate.
- The electrochemical method of accelerated scaling to assess the scaling power of raw waters of Hamma and Negrine by electrochemical way and in the presence of chemical inhibitors (KH2PO4, polyphosphates and HEDP );
- electrochemical method for measuring impedances of precipitated deposits metal deposit calcium carbonate
- electrolyte interface enables an overall assessment by means of the highfrequency resistance , adhesion and the importance of filing carbonate calcium ( Khalil et al.1993).
-The effect of inhibitors on the morphology and adhesion of the deposit of calcium carbonate was observed by the scanning electron microscope SEM and RX.
The application of chemical treatment of the waters of Hamma and Negrine at temperature of 30°C showed that partial inhibition of hardness requires addition of 2 mg/L of KH2PO4 for Hamma and 3 mg/L for Negrine. By against, the use of the polyphosphates inhibits scaling at a concentration of 10 mg/L for Hamma water and 5 mg/L for Negrine water.
The HEDP effect is at a concentration of 1 00 mg/L for Hamma and 50 mg/L for Negrine.
These values are reduced using the method of rapid controlled precipitation for each of the three inhibitors (0.1 mg/L KH2PO4, 0.01 mg/L Polyphosphates or 0.01 mg/L HEDP) for water of Hamma, and (0.5 mg/L KH2PO4, 1 mg/L Polyphosphates or 0.01 mg/L HEDP ) for water of Negrine.
The chronoamperometric study shows that the scaling time increases with the addition of (0.1 mg/L KH2PO4, 0.04 mg/L Polyphosphates or 0.005 mg/L HEDP ) for Hamma water and (0.5 mg/L KH2PO4, 0.25 mg/L Polyphosphtes or 10-5 mg/L HEDP) for Negrine water.
The impedance measurement obtained from the raw waters of Hamma and Negrine compared to treated waters shows a decrease in the amount of calcium carbonate scale as well as its adhesion by measuring high frequency resistors deposits from addition of (0.01 mg/L KH2PO4, 0.01 mg/L Polyphosphates or 0.005 mg/L HEDP) for Hamma also (0.5 mg/L KH2PO4, 0.05 mg/L Polyphosphates or 0.0075 mg/L HEDP) for Negrine.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU6778.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9831 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6778 BOU/6778 Thèse Bibliothèque principale Thèses Disponible
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