Détail de l'auteur
Auteur Yassine Naoui |
Documents disponibles écrits par cet auteur (2)
Affiner la recherche Interroger des sources externesEtudes thermodynamiques et structurales du nanocomposite polyethylene contenant des nanotubes de carbone multiparois. / Yassine Naoui
Titre : Etudes thermodynamiques et structurales du nanocomposite polyethylene contenant des nanotubes de carbone multiparois. Type de document : texte imprimé Auteurs : Yassine Naoui, Auteur ; S. Hamamda, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 120 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : "polymère, polyéthylène, nanotube, carbone, dilatation, Anisotropie, Raman, DSC,
TG, FTIR."
"polymer, polyethylene, nanotube, carbon, multiwalled, expansion, Raman, DSC, TGA,
FTIR."
بوليمر-بوليثليلين-نانوتيب-كربون-مركب نانومتري-تمدد+رامان-السعة الحرارية التفاليةة-تحليل تارموغرافيمتري-اشعة ماتحت الحمراءIndex. décimale : 530 Physique Résumé : The results obtained show that the coefficient of thermal expansion of the nanocomposite
PE+X%CNT is changed between the radial direction and the longitudinal one, whatever the
concentration of carbon nanotubes.
According to the radial direction, is higher than the coefficients in the whole of the
of temperature domain. According to the longitudinal direction, the dilatometric behaviour of the
nanocomposite changes completely. Pure polyethylene presents a thermal expansion coefficient
very large in comparison to that of the three others. The four curves contain each one a dilatometric
anomaly. Its intensity depends on the concentration.
We notice that the thermal expansion coefficient as well as the intensity of the dilatometric anomaly
of the nanocomposite EP+1%CNT is the weakest one in front of the three others whatever the
direction of measurement.
The curves of differential scanning calorimetry of the four samples have the same form and the
shapes are practically confused. They contain each one a calorimetric anomaly appearing at 95°C.
Thermogravimetric measurements of the two nanomaterials containing respectively 1 and 2.5%
NTC give curves which overlap and have intensities appreciably the same ones. As for the sample
containing 0.5% NTC, its TG is very intense in front of the two other nanocomposites and that of
pure material on all the studied temperature range.
The Raman spectroscopy, of the studied samples, reveal that the intensities of the various peaks
present on the four curves strongly vary according to the concentration in nanotubes. The curves of
the pure sample and the nanocomposite EP+0.5%CNT are superposable. As for the spectra of two
other nanomatérials containers 1 and 2.5%CNT, they have the same form and are superposable.
The two spectra contain the same number of anomalies and appear at the same frequencies. The
Raman intensity of the nanomaterial PE2.5%CNT is lower than the three others.
The spectra obtained by the infrared illustrate an important intensification due to the introduction
of the carbon nanotubes into polyethylene. The shapes of the curves of the three nanocomposites,
whatever the concentration in multiwalled carbon nanotubes, changed form and became more
intense in comparison to that of pure polyethylene. That of nanomaterial PE+1%NTC have the
greatest intensity.
The use of several experimental techniques for the realization of this work made it possible to
highlight and to confirm the positive role of the carbon nanotubes introduced into polyethylene.
The results obtained in this thesis are of an unquestionable contribution in the field of sciences of
materials. Dilatometry enabled us to show that the nanocomposite containing 1%NTC has a low
thermal dilation coefficient according to the temperature. This behaviour makes it interesting in the
industrial field. The mechanical tests confirmed that the injection of carbon multiparois nanotubes
in polyethylene made increase the elastic range. The Raman spectroscopy showed that the increase
in the concentration in carbon multiparois nanotubes in polyethylene high density PEHD makes
decrease the quantity of defects, improves qualities of the nanocomposite, reinforces the C-C bonds
and led to an ordered structure.
Diplôme : Magistère En ligne : ../theses/physique/NAO6791.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10016 Etudes thermodynamiques et structurales du nanocomposite polyethylene contenant des nanotubes de carbone multiparois. [texte imprimé] / Yassine Naoui, Auteur ; S. Hamamda, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 120 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : "polymère, polyéthylène, nanotube, carbone, dilatation, Anisotropie, Raman, DSC,
TG, FTIR."
"polymer, polyethylene, nanotube, carbon, multiwalled, expansion, Raman, DSC, TGA,
FTIR."
بوليمر-بوليثليلين-نانوتيب-كربون-مركب نانومتري-تمدد+رامان-السعة الحرارية التفاليةة-تحليل تارموغرافيمتري-اشعة ماتحت الحمراءIndex. décimale : 530 Physique Résumé : The results obtained show that the coefficient of thermal expansion of the nanocomposite
PE+X%CNT is changed between the radial direction and the longitudinal one, whatever the
concentration of carbon nanotubes.
According to the radial direction, is higher than the coefficients in the whole of the
of temperature domain. According to the longitudinal direction, the dilatometric behaviour of the
nanocomposite changes completely. Pure polyethylene presents a thermal expansion coefficient
very large in comparison to that of the three others. The four curves contain each one a dilatometric
anomaly. Its intensity depends on the concentration.
We notice that the thermal expansion coefficient as well as the intensity of the dilatometric anomaly
of the nanocomposite EP+1%CNT is the weakest one in front of the three others whatever the
direction of measurement.
The curves of differential scanning calorimetry of the four samples have the same form and the
shapes are practically confused. They contain each one a calorimetric anomaly appearing at 95°C.
Thermogravimetric measurements of the two nanomaterials containing respectively 1 and 2.5%
NTC give curves which overlap and have intensities appreciably the same ones. As for the sample
containing 0.5% NTC, its TG is very intense in front of the two other nanocomposites and that of
pure material on all the studied temperature range.
The Raman spectroscopy, of the studied samples, reveal that the intensities of the various peaks
present on the four curves strongly vary according to the concentration in nanotubes. The curves of
the pure sample and the nanocomposite EP+0.5%CNT are superposable. As for the spectra of two
other nanomatérials containers 1 and 2.5%CNT, they have the same form and are superposable.
The two spectra contain the same number of anomalies and appear at the same frequencies. The
Raman intensity of the nanomaterial PE2.5%CNT is lower than the three others.
The spectra obtained by the infrared illustrate an important intensification due to the introduction
of the carbon nanotubes into polyethylene. The shapes of the curves of the three nanocomposites,
whatever the concentration in multiwalled carbon nanotubes, changed form and became more
intense in comparison to that of pure polyethylene. That of nanomaterial PE+1%NTC have the
greatest intensity.
The use of several experimental techniques for the realization of this work made it possible to
highlight and to confirm the positive role of the carbon nanotubes introduced into polyethylene.
The results obtained in this thesis are of an unquestionable contribution in the field of sciences of
materials. Dilatometry enabled us to show that the nanocomposite containing 1%NTC has a low
thermal dilation coefficient according to the temperature. This behaviour makes it interesting in the
industrial field. The mechanical tests confirmed that the injection of carbon multiparois nanotubes
in polyethylene made increase the elastic range. The Raman spectroscopy showed that the increase
in the concentration in carbon multiparois nanotubes in polyethylene high density PEHD makes
decrease the quantity of defects, improves qualities of the nanocomposite, reinforces the C-C bonds
and led to an ordered structure.
Diplôme : Magistère En ligne : ../theses/physique/NAO6791.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10016 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité NAO/6791 NAO/6791 Thèse Bibliothèque principale Thèses Disponible
Titre : Influence des additions nanométriques sur les propriétés thermodynamiques et structurales des matériaux. Type de document : texte imprimé Auteurs : Yassine Naoui, Auteur ; Smail Hamamda, Directeur de thèse Mention d'édition : 21/01/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 186 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: Sciences des matériaux Sciences des matériaux: Semi-conducteurs Cellulose MWCNT Ciment portland Fe-Cu DSC Dilatométrie TG DRX SERS Photoluminescence Portland cement Dilatometry السليلوز أنابيب الكربون النانوية الإسمنت البورتلاندي الحديد-نحاس المسعر التفاضلي قياس التمدد الحراري التغير في الوزن حراريا انعراج الأشعة السينية مطيافية رامان التلألؤ الضوئي Index. décimale : 530 Physique Résumé :
The objective of the work undertaken within the framework of this thesis is the study of the thermodynamic and structural characteristics of a class of nanocomposites. The characteristics of luminescent materials based on microcrystalline cellulose (MCC) containing oxides and rare earth elements were investigated. In order to highlight the role of multi-walled carbon nanotubes (MWCNT) in the improvement of physical properties of materials (portland cement, FeCu), several thermodynamic and structural techniques have been carried out. • For luminescent materials: Several series (A, B, C and D) of samples were studied. Several non-destructive testing methods have been used. The results obtained are a contribution to the development of cellulose/oxide composites studied as luminescent transformers of violet and blue light and of a new type of electroluminescent diodes of white light. • For Portland cement + plasticizer nanocomposites / MWCNT: Two samples underwent several characterizations to study the effect of the addition of multi walled carbon nanotubes (MWCNT) on the thermodynamic and structural properties of the samples produced. The DSCs of the two samples are similar. The two curves contain the same number of anomalies and they appear at the same temperatures. This can mean that only one mechanism is operational. The effect of MWCNT dispersion plays a significant role. TG has shown that MWCNTs well stabilize the matrix. The agglomeration of MWCNTs blocks the expansion of the matrix which can lead to contraction and occupation of different types of defects. The XRD showed a remarkable increase in the intensity of the peaks of the spectrum of the sample containing the MWCNTs. This may be related to the increase in the degree of crystallinity of the CH formed and/or to the increase in the rate of its formation. • For FeCu / MWCNT nanocomposites: Four FeCu-based nanocomposites containing different concentrations of MWCNT (0%, 0.25%, 0.75% and 1% MWCNT) were synthesized by high energy ball milling, then underwent characterizations using different techniques. XRD has shown that crystallite sizes vary from 26 to 84 nm and the stresses are negligible. The FeCu + 1% MWCNT sample has the best refinement. SERS characterization revealed that the 1% concentration of MWCNT is responsible for the homogeneous distribution of MWCNT. In addition, the ID/IG ratio decreased with the increasing of MWCNT concentration. A decrease in the expansion of the three nanomaterials was observed compared to conventional materials. The introduction of 1% MWCNT is the cause of the lower expansion. At low temperatures, the TG curves are line segments. As the temperature rises, TG increases slightly. At high temperatures, the effect of oxidation depends on the concentration of MWCNT. The FeCu/1% MWCNT nanomaterial has the lowest TG. The DSC results showed the same observation as that of the TG analysis.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/NAO7705.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11539 Influence des additions nanométriques sur les propriétés thermodynamiques et structurales des matériaux. [texte imprimé] / Yassine Naoui, Auteur ; Smail Hamamda, Directeur de thèse . - 21/01/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 186 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: Sciences des matériaux Sciences des matériaux: Semi-conducteurs Cellulose MWCNT Ciment portland Fe-Cu DSC Dilatométrie TG DRX SERS Photoluminescence Portland cement Dilatometry السليلوز أنابيب الكربون النانوية الإسمنت البورتلاندي الحديد-نحاس المسعر التفاضلي قياس التمدد الحراري التغير في الوزن حراريا انعراج الأشعة السينية مطيافية رامان التلألؤ الضوئي Index. décimale : 530 Physique Résumé :
The objective of the work undertaken within the framework of this thesis is the study of the thermodynamic and structural characteristics of a class of nanocomposites. The characteristics of luminescent materials based on microcrystalline cellulose (MCC) containing oxides and rare earth elements were investigated. In order to highlight the role of multi-walled carbon nanotubes (MWCNT) in the improvement of physical properties of materials (portland cement, FeCu), several thermodynamic and structural techniques have been carried out. • For luminescent materials: Several series (A, B, C and D) of samples were studied. Several non-destructive testing methods have been used. The results obtained are a contribution to the development of cellulose/oxide composites studied as luminescent transformers of violet and blue light and of a new type of electroluminescent diodes of white light. • For Portland cement + plasticizer nanocomposites / MWCNT: Two samples underwent several characterizations to study the effect of the addition of multi walled carbon nanotubes (MWCNT) on the thermodynamic and structural properties of the samples produced. The DSCs of the two samples are similar. The two curves contain the same number of anomalies and they appear at the same temperatures. This can mean that only one mechanism is operational. The effect of MWCNT dispersion plays a significant role. TG has shown that MWCNTs well stabilize the matrix. The agglomeration of MWCNTs blocks the expansion of the matrix which can lead to contraction and occupation of different types of defects. The XRD showed a remarkable increase in the intensity of the peaks of the spectrum of the sample containing the MWCNTs. This may be related to the increase in the degree of crystallinity of the CH formed and/or to the increase in the rate of its formation. • For FeCu / MWCNT nanocomposites: Four FeCu-based nanocomposites containing different concentrations of MWCNT (0%, 0.25%, 0.75% and 1% MWCNT) were synthesized by high energy ball milling, then underwent characterizations using different techniques. XRD has shown that crystallite sizes vary from 26 to 84 nm and the stresses are negligible. The FeCu + 1% MWCNT sample has the best refinement. SERS characterization revealed that the 1% concentration of MWCNT is responsible for the homogeneous distribution of MWCNT. In addition, the ID/IG ratio decreased with the increasing of MWCNT concentration. A decrease in the expansion of the three nanomaterials was observed compared to conventional materials. The introduction of 1% MWCNT is the cause of the lower expansion. At low temperatures, the TG curves are line segments. As the temperature rises, TG increases slightly. At high temperatures, the effect of oxidation depends on the concentration of MWCNT. The FeCu/1% MWCNT nanomaterial has the lowest TG. The DSC results showed the same observation as that of the TG analysis.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/NAO7705.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11539 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité NAO/7705 NAO/7705 Thèse Bibliothèque principale Thèses Disponible
