Academic literature on the topic 'Diffraction aux petits angles'
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Journal articles on the topic "Diffraction aux petits angles"
Nakamura, N., G. Gebel, and P. Aldebert. "L'octadécanol-1: un composé étalon en diffraction aux petits angles." Journal of Applied Crystallography 22, no. 1 (February 1, 1989): 75. http://dx.doi.org/10.1107/s0021889888009872.
Full textNallet, F. "Introduction à la diffusion aux petits angles." École thématique de la Société Française de la Neutronique 11 (2010): 17–42. http://dx.doi.org/10.1051/sfn/201011003.
Full textPardo, B., F. Bridou, and M. Maaza. "Réflectométrie X et diffusion aux petits angles." Le Journal de Physique IV 06, no. C4 (July 1996): C4–351—C4–366. http://dx.doi.org/10.1051/jp4:1996432.
Full textGlättli, H. "La diffusion de neutrons aux petits angles." Le Journal de Physique IV 11, PR9 (November 2001): Pr9–19—Pr9–32. http://dx.doi.org/10.1051/jp4:2001902.
Full textLairez, D. "Introduction à la diffusion de neutrons aux petits angles." Journal de Physique IV (Proceedings) 103 (February 2003): 253–90. http://dx.doi.org/10.1051/jp4:200300010.
Full textLairez, D. "Bonnes pratiques de la diffusion de neutrons aux petits angles." École thématique de la Société Française de la Neutronique 11 (2010): 43–69. http://dx.doi.org/10.1051/sfn/201011004.
Full textAuvray, L., and A. Brûlet. "Diffusion de neutrons aux petits angles appliquée aux études d'interfaces et de systèmes confinés." École thématique de la Société Française de la Neutronique 12 (2007): 179–205. http://dx.doi.org/10.1051/sfn:20070014.
Full textBen Rhaiem, H., and C. H. Pons. "Ajustement des courbes de diffusion aux petits angles des rayons X, produites par des argiles fortement hydratees dans le cas d'une focalisation lineaire de hauteur finie." Clay Minerals 31, no. 2 (June 1996): 279–82. http://dx.doi.org/10.1180/claymin.1996.031.2.13.
Full textBrusset, H. "La structure colloïdale des charbons (Diffusion des rayons X aux petits angles)." Bulletin des Sociétés Chimiques Belges 57, no. 7-9 (September 1, 2010): 373–80. http://dx.doi.org/10.1002/bscb.19480570711.
Full textTeixeira, J. "Remarques sur la notion de cohérence en diffusion de neutrons aux petits angles." École thématique de la Société Française de la Neutronique 11 (2010): 7–15. http://dx.doi.org/10.1051/sfn/201011002.
Full textDissertations / Theses on the topic "Diffraction aux petits angles"
MANGENOT, Stephanie. "Conformation, inetraction et organisation des particles coeur de nucleosome." Phd thesis, Université Paris Sud - Paris XI, 2001. http://tel.archives-ouvertes.fr/tel-00002115.
Full textDufaye, Maxime. "Synthèses, caractérisations et cristallochimie de polyoxométallates incorporant des actinides et des lanthanides comme simulants d’actinides." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R036/document.
Full textThe research of molecules for the extraction and stabilization of actinides is a key topic in the field of chemistry related to the reprocessing of spent fuels in the nuclear industry. Among the chemical species, vacant polyoxometalates, owing to their modular structural properties and high nucleophilia, are good candidates for the complexation of metal cations. In this context, the association of trivacant polyoxotungstates with tetravalent and hexavalent actinides (thorium(IV), uranium(IV and VI)) and lanthanides considered as minor actinide simulants was investigated. The studies concerned the reactivity of trivacant precursors {SiW9O34}, {AsIIIW9O33}, {AsVW9O34} and {PW9O34} with 4f elements (Ce(IV)) and 5f (Th(IV), (U(VI)), which resulted in the complexation of hexanuclear clusters {Ce6O8} or polyanionic systems incorporating up to 12 actinides Th(IV) or U(VI) centers. Cryptand species {As4W40O140} and {P8W48O184} have encapsulated up to 4 uranium(IV) cations or 7.2 uranyl cations per molecule respectively. The third cryptant tested {Na2Sb8W36O132(H2O)4} did not allow actinide complexation. It nevertheless reorganizes, forming a polyanionic entity containing the species {SbW10O37} and {SbW8O31} during the reaction with trivalent lanthanides (Gd --> Lu). A total of 23 crystallized compounds were characterized by single crystal X-ray diffraction. The various molecular assemblies have been subjected to physico-chemical characterizations (IR, TGA). Their stability, particularly in aqueous solution, has been demonstrated by X-ray scattering (SAXS)
Bellet, Daniel. "Etude des textures des superalliages monocristallins par diffraction et diffusion des rayonnements : X, [gamma] et neutrons." Grenoble 1, 1990. http://www.theses.fr/1990GRE10016.
Full textLegrand, Gauthier. "Understanding Hydrogel Formation in Dispersions of Carbon black and Carboxymethylcellulose : Rheological, Electrical and Structural Perspectives." Electronic Thesis or Diss., Lyon, École normale supérieure, 2024. http://www.theses.fr/2024ENSL0040.
Full textDispersions based on colloids and polymers enable the design of numerous materials, particularly for energy storage. This thesis concerns aqueous dispersions of hydrophobic soot particles, carbon black (CB), using a sodium salt of carboxymethylcellulose (CMC). CMC is a charged, semi-flexible, water-soluble polymer with hydrophobic regions along its chain, forming physical bonds with the CB particles. We show that it is possible to form CB-CMC hydrogels, i.e., viscoelastic solids over a wide range of CB and CMC concentrations. These hydrogels exhibit two radically different types of behavior on either side of a critical mass ratio between CMC and CB. Below this critical ratio, CB colloids form a percolated network stabilized by CMC, whereas, above this ratio, CB colloids act as physical cross-linkers in the CMC matrix. We report here a detailed picture of these two types of structures through linear and non-linear rheological measurements, coupled with dielectric and structural (X-ray scattering) measurements.Finally, to elucidate the singular role of CMC within CB-CMC hydrogels, we studied a complementary system consisting of acidified suspensions of CMC that form a gel due to hydrophobic interactions. These studies make use of two complementary techniques, relaxometry and neutron scattering, to shed new light on the role of the polymer within these composite gels
Goubet, Nicolas. "Nano et supracristaux d'or : sur l'influence de la nanocristallinité." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066119/document.
Full textThis thesis deals with the influence of crystal defects of gold nanocrystals, especially on the synthesis and self-assembly of gold nanocrystals whose crystal defects and size are controlled. During this work, a method have been developed to separate single and polycrystals with similar size using crystalline segregation. Then, these nanocrystals have been used as seeds for a second crystal growth in order to expand their size from 5 nm to 13 nm in diameter. The plasmonic and vibrational properties of these gold nanocrystals have also been studied. The obtained nanocrystals exhibit low size distribution that allows their self-assemblies into three dimensional ordered lattice, called supracrystals. Negative supracrystals and vicinal surfaces have been observed under specific self-assembly conditions. Moreover, it is possible to obtain supracrystals with submillimeter size containing only either single or polycrystals and study them in an individual way by X-ray diffraction. It has also been possible to correlate the translational and orientational order of gold nanocrystals within the supracrystalline lattice
Stanescu, Stefan. "Structure et morphologie de couches ultraminces et nanostructures de NiO / Cu(111) et NiO / FeNi / Cu(111)." Phd thesis, Université Louis Pasteur - Strasbourg I, 2002. http://tel.archives-ouvertes.fr/tel-00010139.
Full textDufaye, Maxime. "Synthèses, caractérisations et cristallochimie de polyoxométallates incorporant des actinides et des lanthanides comme simulants d’actinides." Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR036.
Full textThe research of molecules for the extraction and stabilization of actinides is a key topic in the field of chemistry related to the reprocessing of spent fuels in the nuclear industry. Among the chemical species, vacant polyoxometalates, owing to their modular structural properties and high nucleophilia, are good candidates for the complexation of metal cations. In this context, the association of trivacant polyoxotungstates with tetravalent and hexavalent actinides (thorium(IV), uranium(IV and VI)) and lanthanides considered as minor actinide simulants was investigated. The studies concerned the reactivity of trivacant precursors {SiW9O34}, {AsIIIW9O33}, {AsVW9O34} and {PW9O34} with 4f elements (Ce(IV)) and 5f (Th(IV), (U(VI)), which resulted in the complexation of hexanuclear clusters {Ce6O8} or polyanionic systems incorporating up to 12 actinides Th(IV) or U(VI) centers. Cryptand species {As4W40O140} and {P8W48O184} have encapsulated up to 4 uranium(IV) cations or 7.2 uranyl cations per molecule respectively. The third cryptant tested {Na2Sb8W36O132(H2O)4} did not allow actinide complexation. It nevertheless reorganizes, forming a polyanionic entity containing the species {SbW10O37} and {SbW8O31} during the reaction with trivalent lanthanides (Gd --> Lu). A total of 23 crystallized compounds were characterized by single crystal X-ray diffraction. The various molecular assemblies have been subjected to physico-chemical characterizations (IR, TGA). Their stability, particularly in aqueous solution, has been demonstrated by X-ray scattering (SAXS)
Roblin, Pierre. "Caractérisation structurale de la polykétide synthase pks13 de mycobactérium tuberculosis : étude structurale des composés S et F de la gamma-hémolysine de staphylococcus aureus sous forme d'hétérodimère covalent." Toulouse 3, 2007. http://www.theses.fr/2007TOU30297.
Full textTuberculosis is now the principle cause of death due to a single infectious agent (Mycobacterium tuberculosis). Mycolic acids are essential lipids of the mycobacteria cell wall. Their relative abundance and their hydrophobic nature gives the envelope a strong impermeability, thus protecting the mycobacterium from the external environment. As Pks13 enzyme is involved in the last stage of mycolic acids biosynthesis, this inactivation affects directly the integrity of the envelope and to the survival of the mycobacteria. Pks13 is a large protein (186 kDa), consisting of five catalytic domains located on the same polypeptide chain and connected each other by loops of varying length. No structure of a type PKS I has yet been established. However, low-resolution structures of two bacterial similar systems (FAS) have recently been determined and high-resolution structures of homologues domains are known. The manuscript of the thesis contents the work carried out on a number of fragments Pks13, showing their production and purification and their biophysical characterization solution and the crystal genesis. .
Van, der Grinten Maurits. "Diffusion des neutrons aux petits angles. Variation de contraste par polarisation dynamique." Paris 11, 1993. http://www.theses.fr/1993PA112213.
Full textGummel, Jérémie. "Structures et mécanismes de formation de complexes polyélectrolyte-protéine." Paris 11, 2006. https://tel.archives-ouvertes.fr/tel-00120315.
Full textThe mechanisms driving the formation of complexes made of charged polymeric chains (polyelectrolytes) and proteins, found in domains such as food engineering, pharmacology, or biology, lead to structures still poorly known. We studied them by Small Angle Neutron Scattering (SANS) and used deuterated polymer and contrast matching in solvents made of heavy water and light water. The protein is the lysozyme (positively charged at pH<11) and the polyelectrolyte is polystyrene sulfonate (PSS, always negatively charged). The ratio of charges brought ([-]/[+]) is an essential parameter. When it is close to 1, two structures can be obtained. One is a gel of PSS crosslinked by the proteins, that locally shrink the PSS chains but keep them in an entangled regime (semi-diluted). The other is made of dense globules (radius ~10 nm) with a fractal organisation at higher scale where the chains are too short and are in a disentangled regime (diluted) after being shrunk. This structure is very well defined and allows a deeper study: we have shown that the core of the globules has a null charge, that the species in excess in an electrostatic point of view stay in solution, possibly in a shell for the PSS chains, and that their size is fixed by the ionic strength. A specific measurement of the counterions has proved that they are ejected from the core of the complexes during their formation. The conformation of the chains inside the complexes has been measured using an adapted labelling. Finally when [-]/[+]>>1, a fluid and limpid transient network of proteins denatured by the PSS is obtained
Books on the topic "Diffraction aux petits angles"
P, Cotton J., Nallet F, and Société française de neutronique, eds. Diffusion de neutrons aux petits angles (DNPA): École thématique de la Société française de neutronique, Albé, Massif Vosgien, France, 12-13 mai 1998. Les Ulis, France: EDP Sciences, 1999.
Find full textÉcole Thématique de la Société Française de Neutronique (1998 Albé, Massif Vosgien, France). Diffusion de neutrons aux petits angles (DNPA): École Thématique de la Société Française de Neutronique, Albé, Massif Vosgien, France, 12-13 mai 1998. Les Ulis cedex A, France: EDP Sciences, 1999.
Find full textParticle And Particle Systems Characterization Smallangle Scattering Sas Applications. Taylor & Francis Inc, 2013.
Find full textBook chapters on the topic "Diffraction aux petits angles"
BLIVI, Adoté Sitou, Benhui FAN, Djimédo KONDO, and Fahmi BEDOUI. "Technique de caractérisation morphologique des polymères nanorenforcés." In Nanocomposites, 49–71. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9031.ch2.
Full text"10. Diffusion aux petits angles des rayons X et des neutrons." In Du verre au cristal, 233–54. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1064-2-016.
Full text"10. Diffusion aux petits angles des rayons X et des neutrons." In Du verre au cristal, 233–54. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1064-2.c016.
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