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Littérature scientifique sur le sujet « Colloidal synthesi »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Colloidal synthesi"

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Cademartiri, Ludovico, et Geoffrey A. Ozin. « Emerging strategies for the synthesis of highly monodisperse colloidal nanostructures ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 368, no 1927 (28 septembre 2010) : 4229–48. http://dx.doi.org/10.1098/rsta.2010.0126.

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This short perspective describes recent developments in the synthesis of nanoscale colloids from sparingly soluble precursors. These strategies, which we dubbed ‘heterogeneous nanocrystal syntheses’ owing to the presence of a precursor in a non-colloidal solid state, have demonstrated the ability to generate new colloidal shapes, a superior monodispersity and a remarkable ability to delay the onset of Ostwald ripening, when compared with more traditional and purely colloidal strategies. We review the key contributions to this emerging area of research and discuss in detail the remarkable number of differences between these syntheses and the widely used homogeneous organometallic syntheses for making nanoscale colloids.
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Schmid, Günter, Andreas Lehnert, Ulrich Kreibig, Zbignew Adamczyk et Peter Belouschek. « Synthese und elektronenmikroskopische Untersuchung kontrolliert gewachsener, ligandstabilisierter Goldkolloide sowie theoretische Überlegungen zur Oberflächenbelegung durch Kolloide / Synthesis and Electron Microscopic Investigation of Controlled Grown, Ligand Stabilized Gold Colloids and Theoretical Considerations on the Covering of Surfaces by Colloids ». Zeitschrift für Naturforschung B 45, no 7 (1 juillet 1990) : 989–94. http://dx.doi.org/10.1515/znb-1990-0713.

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18 nm Gold colloids are used as seeds for a controlled growth of 36 nm colloids which are then stabilized by P(m-C6H4SO3Na)3. These colloids can be isolated as golden leaflets and are readily soluble in water in virtually any concentration. Electron microscopic investigations prove a very small particle size distribution. X-ray powder diffraction and molecular weight determinations support the results of the electron microscopic investigations. The distance between the colloidal particles in two-dimensional layers corresponds to double-layers of phosphane ligands around each colloid, twice 1.2 nm. Isolated colloids seem to possess thicker ligand shells. A single 44 nm colloid shows a corona of about 7.2 nm thickness, corresponding to 12 phosphane layers. A quantitative description of two-dimensional packing densities is suggested using a novel theoretical model. By means of Monte Carlo simulations the two-dimensional structures are formed during the covering of supports of different geometry can be calculated.
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Nikishina, Maria B., Evgenia V. Ivanova, Yury M. Atroschenko, Irina V. Shahkeldyan, Igor V. Blohin, Loik G. Mukhtorov, Konstantin I. Kobrakov et Georgy V. Pestsov. « Biological activity of colloidal solutions of silver, obtained by means of sálix cáprea extract ». Butlerov Communications 60, no 10 (31 octobre 2019) : 54–59. http://dx.doi.org/10.37952/roi-jbc-01/19-60-10-54.

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The presented publication is devoted to the study of the biological activity of silver colloids synthesized based on extracts obtained from various parts of the goat willow plant (Sálix cáprea). The ability of colloidal silver solutions of various concentrations to stimulate growth processes in wheat seeds at the germination stage is analyzed. The effect of colloidal solutions on the catalytic effect of amylase was studied. The fungicidal activity of synthesized silver particles was studied. For the study, colloidal silver particles were obtained by the "green synthesis" method. Extracts of goat willow bark, leaves and buds of varying degrees of dilution were used as a reducing agent. The analysis of sugar content and pH of solutions of plant extracts before and after colloid formation was carried out in order to establish the participation of sugars and acids in the process of silver recovery. The biological activity of colloids was analyzed on the seeds of winter wheat cultivar "Moskovskaya-39". The germination energy of wheat seeds was determined on the 3rd day after sowing by counting the germinated seeds. Amylase activity was measured in the roots and shoots of wheat plants by the amount of undecomposed starch by spectrophotometry. Fungicidal activity was studied with respect to fungi: F. moniliforme, F. oxysporum, S. sclerotiorum, V. inaequalis, R. solani, B. sorokiniana, P. ostreatus. The data obtained show that the sugars that make up the initial extracts of various parts of goat willow are completely consumed in the process of silver recovery and the formation of colloidal particles. A change in the acid content at the stage of colloid formation does not allow us to draw an unambiguous conclusion about the mechanism of participation of these compounds in the process of colloid formation. A study of the biological activity of synthesized silver colloids showed their high ability to stimulate growth processes in wheat seeds. A study of enzymatic catalysis also shows, in general, the positive effect of silver colloids on amylase activity within 1 minute of the starch hydrolysis reaction. An analysis of the data obtained in the study of fungistaticity suggests that silver colloids obtained in extracts from leaves, bark and willow inflorescences exhibit high fungicidal activity against F. moniliforme, S. sclerotiorum, P. ostreatus and B. sorokiniana.
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Valverde-Alva, Miguel A., Jhenry F. Agreda-Delgado, Juan A. Vega-González, Juan C. Rodríguez-Soto, Julio C. Idrogo-Córdova, Luis M. Angelats-Silva et Claver W. Aldama-Reyna. « Effect of the magnetic field on the synthesis of colloidal silver and gold nanoparticles by laser ablation in bidestilated water ». MOMENTO, no 63 (9 juillet 2021) : 1–11. http://dx.doi.org/10.15446/mo.n63.91515.

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The effect of magnetic field of 0.3 T on the concentration, distribution of sizes in suspension and zeta potential of colloidal gold and colloidal silver nanoparticles, obtained by considering the pulsed laser ablation in double distilled water was studied. The magnetic field was transverse to the direction of incidence of the laser radiation and parallel to the surface of a submerged target. An Nd: YAG laser was used (1064 nm in wavelength, 10 ns in duration, repetition rate of 10 Hz and 37 mJ of energy) to ablate targets. The colloids were characterized by inductively coupled plasma optical emission spectroscopy, ultraviolet-visible spectroscopy, dynamic light scattering and zeta potential. Concentration analysis suggested that applying magnetic field of 0.3 T during nanoparticle synthesis leads to higher concentration. Applying magnetic field led to an eleven percent increase in the concentration of the colloid with gold nanoparticles and a five percent increase in the concentration of the colloidal silver nanoparticles. The absorption spectra suggested the presence of spherical nanoparticles. When analyzing the effect of the magnetic field on the hydrodynamic size distribution of the nanoparticles and the zeta potential of the colloids, no significant changes were evidenced. The magnetic confinement of the plasma induced by laser ablation caused changes in the characteristics of the colloids.
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Goncharov, Victor, Konstantin Kozadaev et Dzmitry Shchehrykovich. « Investigation of Noble Metals Colloidal Systems Formed by Laser Synthesis at Air ». Advances in Optical Technologies 2012 (8 juillet 2012) : 1–5. http://dx.doi.org/10.1155/2012/907292.

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The present work is dedicated to the development of formation and diagnostics methods of water colloids of noble metals (Au, Au, Pt). As anoble nanoparticles formation method, the laser synthesis at air conditions is proposed. By the implantation of noble nanoparticles into water media, the colloidal systems of noble metals can be obtained. For the aims of investigation of noble colloid parameters, the complex diagnostics method is used. Such approach deals with direct methods (scanning electron microscopy and the characteristic radiation registration) and indirect methods (absorption spectroscopy and extinction modeling by Mie theory).
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Kendall, Owen, Pierce Wainer, Steven Barrow, Joel van Embden et Enrico Della Gaspera. « Fluorine-Doped Tin Oxide Colloidal Nanocrystals ». Nanomaterials 10, no 5 (30 avril 2020) : 863. http://dx.doi.org/10.3390/nano10050863.

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Fluorine-doped tin oxide (FTO) is one of the most studied and established materials for transparent electrode applications. However, the syntheses for FTO nanocrystals are currently very limited, especially for stable and well-dispersed colloids. Here, we present the synthesis and detailed characterization of FTO nanocrystals using a colloidal heat-up reaction. High-quality SnO2 quantum dots are synthesized with a tuneable fluorine amount up to ~10% atomic, and their structural, morphological and optical properties are fully characterized. These colloids show composition-dependent optical properties, including the rise of a dopant-induced surface plasmon resonance in the near infrared.
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Susilowati, Endang, Triyono Triyono, Sri Juari Santosa et Indriana Kartini. « Synthesis of Silver-Chitosan Nanocomposites Colloidal by Glucose as Reducing Agent ». Indonesian Journal of Chemistry 15, no 1 (30 mars 2015) : 29–35. http://dx.doi.org/10.22146/ijc.21220.

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Silver-chitosan nanocomposites colloidal was successfully performed by chemical reduction method at room temperature using glucose as reducing agent, sodium hydroxide (NaOH) as accelerator reagent, silver nitrate (AgNO3) as metal precursor and chitosan as stabilizing agent. Compared to other synthetic methods, this work is green and simple. The effect of the amount of NaOH, molar ratio of AgNO3 to glucose and AgNO3 concentration towards Localized Surface Plasmon Resonance (LSPR) absorption band of silver nanoparticles was investigated using UV-Vis spectrophotometer. The stability of the colloid was also studied for the first 16 weeks of storage at ambient temperature. The formation of silver nanoparticles was confirmed by the appearance of LSPR absorption peak at 402.4–414.5 nm. It is also shown that the absorption peak of LSPR were affected by NaOH amount, ratio molar AgNO3/glucose and concentration of AgNO3. The produced silver nanoparticles were spherical with dominant size range of 6 to 18 nm as shown by TEM images. All colloidals were stable without any aggregation for 16 weeks after preparation. The newly prepared silver-chitosan nanocomposites colloidal may have potential for antibacterial applications.
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Tian, Lei, Yanxing Liu, Dai Wang, Jiji Tan, Yankun Xie, Bei Li, Qiuyu Zhang, Caizhen Zhu et Jian Xu. « Particle-click-particle : colloidal clusters from click seeded emulsion polymerization ». Polymer Chemistry 13, no 8 (2022) : 1084–89. http://dx.doi.org/10.1039/d1py00360g.

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Pascu, Bogdan, Adina Negrea, Mihaela Ciopec, Corneliu Mircea Davidescu, Petru Negrea, Vasile Gherman et Narcis Duteanu. « New Generation of Antibacterial Products Based on Colloidal Silver ». Materials 13, no 7 (29 mars 2020) : 1578. http://dx.doi.org/10.3390/ma13071578.

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The main objective of the present paper is the green synthesis of colloidal silver by ultrasonication starting from silver nitrate and using soluble starch as the reducing agent. Soluble starch has been used during synthesis because it is a cheap and environmentally friendly reactive. Silver colloid has been characterized by physicochemical methods: UV–VIS spectroscopy, Scanning Electron Microscopy and Energy Dispersive X-Ray spectroscopy. This colloidal material was prepared in order to prove and establish its toxicity on heterotrophic bacteria. Toxicity tests were carried out using test cultures with and without silver colloid with different concentrations. This way was possible to establish the minimum silver concentration that presents a toxic effect against used bacteria. Quantitative evaluation of bacterial growth was performed by using the Most Probable Number method. By counting the bacterial colony number, the antibacterial effect was determined for colloidal silver deposited onto the cotton gauze by adsorption. During the present study, we optimized the adsorption specific parameters: solid:liquid ratio, temperature, contact time, colloidal silver concentration. By thermodynamic, equilibrium and kinetic studies, the adsorptive process mechanism was established.
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Stiufiuc, Rares, Cristian Iacovita, Raul Nicoara, Gabriela Stiufiuc, Adrian Florea, Marcela Achim et Constantin M. Lucaciu. « One-Step Synthesis of PEGylated Gold Nanoparticles with Tunable Surface Charge ». Journal of Nanomaterials 2013 (2013) : 1–7. http://dx.doi.org/10.1155/2013/146031.

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The present work reports a rapid, simple and efficient one-step synthesis and detailed characterisation of stable aqueous colloids of gold nanoparticles (AuNPs) coated with unmodified poly(ethylene)glycol (PEG) molecules of different molecular weights and surface charges. By mixing and heating aqueous solutions of PEG with variable molecular chain and gold(III) chloride hydrate (HAuCl4) in the presence of NaOH, we have successfully produced uniform colloidal 5 nm PEG coated AuNPs of spherical shape with tunable surface charge and an average diameter of 30 nm within a few minutes. It has been found out that PEGylated AuNPs provide optical enhancement of the characteristic vibrational bands of PEG molecules attached to the gold surface when they are excited with both visible (532 nm) and NIR (785 nm) laser lines. The surface enhanced Raman scattering (SERS) signal does not depend on the length of the PEG molecular chain enveloping the AuNPs, and the stability of the colloid is not affected by the addition of concentrated salt solution (0.1 M NaCl), thus suggesting their potential use forin vitroandin vivoapplications. Moreover, by gradually changing the chain length of the biopolymer, we were able to control nanoparticles’ surface charge from −28 to −2 mV, without any modification of the Raman enhancement properties and of the colloidal stability.
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Thèses sur le sujet "Colloidal synthesi"

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CAPITANI, CHIARA. « Synthesis of semiconductor colloidal nanocrystals with large Stokes-shift for luminescent solar concentrators ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/366195.

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I concentratori solari luminescenti (LSCs) sono delle guide d’onda composti da una matrice polimerica drogata o ricoperta con fluorofori. La luce solare diretta e/o diffusa che penetra nella matrice è assorbita dai fluorofori e poi riemessa dagli stessi con energia minore. La luce emessa, grazie alla riflessione totale interna, propaga fino a raggiungere i bordi della guida d’onda dove è convertita in elettricità da celle fotovoltaiche poste sul perimetro della matrice. L’efficienza del dispositivo è ridotta da numerosi processi di perdita, sia dovuti alla riflessione della matrice e al cono di fuga, sia quelli che dipendono dalle caratteristiche dei fluorofori, come il coefficiente di assorbimento, il quantum yield (QY) di fotoluminescenza (PL) e il riassorbimento. Per minimizzare tali perdite, una buona alternativa ai tradizionali fluorofori sono i quantum dots (QDs) colloidali che presentano solitamente un elevato QY, un alto coefficiente di assorbimento e una lunghezza d’onda di emissione controllabile cambiando le dimensioni dei nanocristalli tramite modifiche dei parametri di sintesi. Inoltre, ingegnerizzando opportunamente i QDs, è possibile realizzare particelle con elevato Stokes-shift tra gli spettri di assorbimento ed emissione, in modo da ridurre quanto più possibile il riassorbimento. Il progetto si è quindi focalizzato sullo sviluppo della sintesi di QDs, al fine di ottimizzare il QY di fotoluminescenza, la compatibilizzazione con la matrice polimerica e la fotostabilità, limitando comunque il riassorbimento. Inoltre. la procedura di sintesi deve essere facilmente trasportabile su volumi industriali, per soddisfare il fabbisogno di produzioni di elevati metri quadrati di LSCs. Durante i tre anni di progetto di dottorato in Alto Apprendistato ho potuto sviluppare una procedura di sintesi che consiste in quattro step: • crescita di nanocristalli di CuInS2 core; • formazione del quaternario tramite aggiunta di zinco (ZnCuInS2); passaggio cruciale per aumentare il QY e controllare la lunghezza d’onda di emissione; • crescita di una shell di solfuro di zinco (ZnCuINS2/ZnS) per passivare la superficie dei nanocristalli, aumentare il QY e la fotostabilità; • trattamento post sintesi di scambio di leganti parziale per migliorare la solubilità nella matrice polimerica. I nanocristalli così prodotti mostrano un QY del 60% ed un’ottima solubilità nella matrice polimerica. Infatti, è stato prodotto un LSC di grande dimensione (30 cm x 30 cm x 0.7 cm) la cui optical power efficiency, OPE = 6.8%. Inizialmente ho sviluppato la procedura di sintesi in un pallone di vetro da 25 mL, producendo 250 mg a sintesi. Grazie all’attrezzatura fornita da Glass to Power S.p.A ho potuto studiare lo scale-up della sintesi. Dapprima ho effettuato studi preliminare, per approfondire alcune possibili problematiche dovute all’aumento dei volumi, su palloni di maggiori dimensioni, 500 mL e 2 L. Analizzate e risolte le tematiche di riscaldamento e stop della sintesi ho effettuato sintesi in un reattore preindustriale producendo 300 g di nanocristalli di ZnCuINS2/ZnS. Oltre ad incrementare la produzione di sintesi da 250 mg a 300 g mi sono occupata dell’ottimizzazione della procedura di sintesi. Ho testato diverse strategie per incrementare il QY senza danneggiare la solubilità nel polimero. Grazie ad una variazione di reagente nel secondo step e ad un incremento dei layer della shell ho ottenuto nanocristalli con 80% di QY. Il prossimo step sarà effettuare lo scale-up di questa nuova procedura e produrre LSC di grandi dimensioni. Grazie alle collaborazioni con altri studenti di dottorato ho sintetizzato nanocristalli di calcogenuro drogati oro e opportunamente decorati con molecole coniugate per sistemi di up-conversion. Grazie all’introduzione dell’oro in questi sistemi si è ottenuta un’efficienza di up-conversion del 12%.
Luminescent solar concentrators (LSCs) are waveguides composed of a polymeric matrix doped or coated with fluorophores. The direct and/or diffuse sunlight that penetrates the matrix is absorbed by the fluorophores and then re-emitted by them with less energy. The light emitted, thanks to the total internal reflection, propagates until it reaches the edges of the wave guide where it is converted into electricity by photovoltaic cells placed on the perimeter of the matrix. The efficiency of the device is reduced by numerous loss processes, due to the reflection of the matrix and the escape cone, and/or due to the characteristics of the fluorophores, such as the absorption coefficient, the quantum yield (QY) of photoluminescence (PL) and the reabsorption. To minimize losses due to fluorophores, a good alternative are colloidal quantum dots (QDs) that usually have a high QY, a high absorption coefficient and a controllable emission wavelength by changing the size of the nanocrystals. Furthermore, by properly engineering the QDs, it is possible to realize particles with high Stokes-shift between the absorption and emission spectra, in order to reduce the reabsorption as much as possible. The project is focused on the development of the synthesis of QDs, in order to optimize the QY of photoluminescence, compatibility with the polymer matrix and photostability, while limiting the reabsorption. Besides. the synthesis procedure must be easily transferable on industrial volumes, to meet the production needs of high square meters of LSCs. During the three years of the doctoral project in High Apprenticeship I was able to develop a synthesis procedure consisting of four steps: • growth of CuInS2 core nanocrystals; • quaternary formation with zinc addition (ZnCuInS2); crucial step to increase the QY and control the emission wavelength; • growth of a zinc sulphide shell (ZnCuInS2/ZnS) to passivate the surface of nanocrystals, increase QY and photostability; • post-synthesis treatment of the partial exchange of ligands to improve solubility in the polymer matrix. The nanocrystals thus produced show 60% QY and excellent solubility in the polymer matrix. In fact, a large size LSC (30 cm x 30 cm x 0.7 cm) was produced, whose optical power efficiency, OPE = 6.8%. Initially, I developed the synthesis procedure in a 25 ml glass flask, producing 250 mg for batch. Thanks to the equipment provided by Glass to Power s.p.A I was able to study the increase in the scale of the synthesis. Firstly, in order to investigate some possible problems due to the increase in volumes, I have carried out preliminary studies on larger balloons, 500 mL and 2 L. After analysis of heating and quenching of synthesis, I have performed the synthesis in a preindustrial reactor producing 300 g of nanocrystals of ZnCuInS2/ZnS. In addition I also optimized the synthesis procedure. I tested several strategies to increase QY without damaging solubility in the polymer. Thanks to a variation of the reagent in the second step and an increase of the shell layers, I obtained nanocrystals with 80% of QY. The next step will be to scale up this new procedure and produce large LSCs. I collaborated with other PhD students, in particular, I synthesized with a heat-up method CdSe nanocrystals doped with Au7 clusters and decorated with conjugated dyes as efficient triplet sensitizers or up-conversion applications (gold doping improves up-conversion efficiency). The beneficial effects of the doping strategy result in a maximum UC efficiency of 12%, which is an unprecedented result for up-conversion based on decorated NCs as triplet sensitizers.
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TRIPALDI, LAURA. « Self-Assembly of Nanoparticles in Rubber Nanocomposites ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/381184.

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Le nanoparticelle (NP) di SiO2 sono note per migliorare le proprietà meccaniche e funzionali dei materiali nanocompositi (NC) e sono ampiamente utilizzate come filler di rinforzo negli pneumatici. Le proprietà dei NC dipendono dalla distribuzione delle NP di filler, che a sua volta dipende dalla morfologia e dalla chimica superficiale delle NP. La dispersione di SiO2 NPs idrofiliche in matrici polimeriche è tipicamente ottenuta tramite funzionalizzazione con silani a catena corta. Mentre le NP anisotropiche sono note per auto-organizzarsi in strutture ordinate, producendo migliori proprietà meccaniche nei NC elastomerici, è stato dimostrato che anche le NP sferiche di SiO2 ricoperte con catene di oligomeri, ovvero le SiO2 Hairy NP (SiO2 HNP), possono migliorare la compatibilizzazione filler/matrice mentre si auto-organizzano in superstrutture anisotropiche. Tuttavia, la sintesi di SiO2 HNP con gusci elastomerici è ancora largamente inesplorata, e la relazione tra l'auto-organizzazione delle HNP e le proprietà meccaniche dei NC deve ancora essere del tutto compresa. In questo contesto, lo scopo di questa tesi è stato quello di i) sviluppare una sintesi efficiente di SiO2 HNPs con dimensioni, morfologia e chimica di superficie controllate; ii) preparare NC elastomerici basati su SiO2 HNP con rinforzo migliorato e isteresi ridotta; iii) valutare gli effetti dell'auto-organizzazione sulle prestazioni meccaniche dei materiali e iv) studiare le interazioni tra SiO2 HNPs per determinare quali parametri controllano i processi di auto-organizzazione. Durante il primo anno di attività di dottorato è stata ottimizzata la sintesi di SiO2 HNP funzionalizzate con polibutadiene (PB) con un approccio colloidale. La sintesi ha garantito un eccellente controllo della morfologia e della chimica di superficie delle HNPs. Le particelle non funzionalizzate e funzionalizzate sono state completamente caratterizzate con una pletora di metodi morfologici e fisico-chimici mostrando evidenza di auto-organizzazione. Durante il secondo anno, le SiO2 HNP sono state utilizzate per preparare NC elastomerici in una formulazione industriale. Le proprietà meccaniche dei NC vulcanizzati e non vulcanizzati sono state caratterizzate da analisi dinamico-meccaniche e prove di trazione, mostrando che le HNP migliorano fortemente il rinforzo riducendo la dissipazione di energia, evidenziando migliori interazioni filler/matrice rispetto alle NP SiO2 non funzionalizzate e funzionalizzate con silano. La caratterizzazione morfologica delle NC ha confermato il miglioramento della dispersione e della distribuzione del filler con l'aumento della funzionalizzazione con PB e ha mostrato l'auto-organizzazione delle HNP in sovrastrutture anisotropiche simili a stringhe. Durante il terzo anno, il modello delle HNP è stato adattato a una formulazione riproducibile su scala industriale usando un silano macromolecolare a base di PB (MacroSil) e silice commerciale. Le proprietà meccaniche degli NC elastomerici sono state caratterizzate in modo approfondito con analisi meccaniche dinamiche, prove di trazione e analisi Large Amplitude Oscillatory Shear (LAOS), dimostrando che l'aggiunta di MacroSil migliora significativamente le prestazioni meccaniche degli NC rispetto a un silano a catena corta. Infine, esperimenti di Small-Angle X-Ray Scattering (SAXS) sulle dispersioni di SiO2 HNPs in collaborazione con il Prof. Simone Mascotto dell'Università di Amburgo hanno fornito parametri strutturali fondamentali che sono stati utilizzati per formulare un modello teorico delle interazioni tra HNP, in collaborazione con il Prof. Arturo Moncho dell'Università di Granada e il Prof. Gerardo Odriozola della UAM-Azcapotzalco. Il modello teorico ha predetto la formazione delle sovrastrutture anisotropiche di SiO2 HNP osservate sia nelle particelle prive di matrice sia nei NC elastomerici.
SiO2 nanoparticles (NPs) are known to improve the mechanical and functional properties of nanocomposite (NC) materials and are widely used as reinforcing fillers in tyres. The properties of NCs depend on the distribution of filler NPs, which in turn depends on the morphology and surface chemistry of filler NPs. The dispersion of hydrophilic SiO2 NPs in polymer matrices is typically achieved by functionalization with short-chain silanes. While anisotropic NPs are known to self-organize in ordered structures, producing improved mechanical properties in rubber NCs, evidence has shown that also spherical SiO2 NPs grafted with oligomer chains, i.e. SiO2 Hairy NPs (SiO2 HNPs), can improve filler/matrix compatibilization while self-organizing in anisotropic superstructures. However, the synthesis of SiO2 HNPs with rubbery shells is still largely unexplored, and the relationship between HNPs self-assembly and the mechanical properties of NCs is yet to be understood. In this context, the aim of this thesis was i) to develp an efficient synthesis of SiO2 HNPs with tunable size, controlled morphology and tailored surface chemistry; ii) to prepare rubber NCs based on SiO2 HNPs with improved reinforcement and reduced hysteresis; iii) to assess the self-assembly effects on the mechanical performance of the materials and iv) to study the interactions between SiO2 HNPs in order to determine which parameters control the self-assembly processes. During the first year of PhD activity the synthesis of polybutadiene (PB)-grafted SiO2 HNPs by a colloidal approach was optimized. The synthesis granted excellent control of HNPs morphology and surface chemistry. The bare and functionalized particles were fully characterized by a plethora of morphological and physico-chemical methods showing evidence of self-assembly. During the second year, SiO2 HNPs were used to prepare rubber NCs in an industrial formulation. The mechanical properties of the cured and uncured NCs were characterized by dynamic-mechanical analysis and tensile tests, showing that HNPs strongly improve reinforcement while reducing energy dissipation, highlighting improved filler/matrix interactions compared to both bare and silane-functionalized SiO2 NPs. Morphological characterization of the NCs confirmed the improvement of filler dispersion and distribution with increased PB functionalization and showed the self-organization of HNPs in anisotropic string-like superstructures. During the third year, the HNPs model was adapted to a scalable industrial rubber formulation using a PB macromolecular silane (MacroSil) and commercial precipitated silica. The mechanical properties of the rubber NCs were thoroughly characterized with dynamic mechanical analysis, tensile tests and Large Amplitude Oscillatory Shear (LAOS) analysis, showing that the addition of MacroSil significantly improves the mechanical performance of NCs compared to a short-chain silane. Finally, Small-Angle X-Ray Scattering of SiO2 HNPs dispersions in collaboration with Prof. Simone Mascotto at Hamburg University provided crucial structural parameters which were used to formulate a theoretical model of HNPs interactions, in collaboration with Prof. Arturo Moncho of the University of Granada and Prof. Gerardo Odriozola of UAM-Azcapotzalco. The theoretical model predicted the formation of the SiO2 HNPs anisotropic superstructures observed both in matrix free conditions and rubber NCs.
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PIRAS, ROBERTO. « Synthesis and Characterization of Bi2S3 Colloidal Nanoparticles for Photovoltaic Applications ». Doctoral thesis, Università degli Studi di Cagliari, 2016. http://hdl.handle.net/11584/266676.

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Global energy consumption is expected to increase significantly together with the greenhouse gas emissions and the problem of fossil fuels exhaustion. Solar energy, as an alternative and renewable form of energy, has gained pop- ularity as possible solution for all these problems. Lots of materials have been studied to implement the energy conversion efficiency of the so-called third generation solar cells. These devices could be a cheaper alternatives to the silicon-based ones. Unfortunately, they are often characterized by short life- time or health hazardous materials. Bismuth sulfide(Bi2S3) is a promising n-type semiconductor for solar energy conversion.In this work,the properties of the compound will be discussed,as well as its potential for applications in solar energy technology.Wehave explored the colloidal synthesis of Bi2S3 nanocrystals,with the aim of employing them in the fabrication of solution- processable solar cells and to replace toxic heavy metals chalcogenides likePbS or CdS,that are currently employed in such devices. We compare different methods to obtain Bi2S3 colloidal quantum dots, including the useof environmentally benign reactants, through horganometallic synthesis. Surfactant-assisted colloidal synthesis(SACS) methods were used to synthesize Bi2S3 nanoparticles with different size and shape.These methods have been employed changing systematically several parameters such as temperature and timeofsynthesis, concentration ofchemical reagents and sulfur precursors. Morphological characteristics and optical properties of all the synthesized nanoparticles have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-Vis and photoluminescence (PL) spectroscopy. After the characterization of electrical properties of bismuth sulfide sam- ples together with the preliminary attempts to find the most advantageous methods for the production of homogeneous film on conductive supports, asample was chosen like standard and it was employed in building of various prototype of third generation solution processed solar cells. Dip and spin coat- ing techniques were employed to produce homogeneous film of nanoparticleson conductive support, also in combination with organic polymer such P3HT, Pedot:PSS and Spiro-OMeTAD. The resulting solar cells were tested for power conversion efficiency (PCE). Synthesis and characterizations have been carried out in Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, under the supervision of Prof. Anna Musinu and Prof. Carla Cannas. Optoelectronic characterizations and solar cells manufacturing have been carried out in Di- partimento di Fisica, Università degli Studi di Cagliari, under the supervision of Prof. Michele Saba, Prof. Andrea Mura and Prof. Giovanni Bongiovanni.
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Khan, Saif A. « Microfluidic synthesis of colloidal nanomaterials ». Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37223.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2006.
Includes bibliographical references.
This thesis focuses on microfluidics based approaches for synthesis and surface-engineering of colloidal particles. Bottom-up assembly through colloidal nucleation and growth is a popular route to the controlled synthesis of nanomaterials. Standard bench-scale synthetic chemistry techniques often involve non-uniform spatial and temporal distributions of concentration and temperature, and are not readily scalable. Photolithography-based microfabrication enables the application of classical techniques of chemical reaction engineering to design chemical reactors that cannot be realized easily at the macroscale, and that closely approach theoretical 'idealized' reactor configurations. In addition, the microfluidic format allows precisely controlled reaction conditions such as rapid mixing, and concentration and temperature uniformity. The goal of this thesis was to design microfluidic reactors for synthesis of core-shell colloidal particles with tunable sizes. Microscale segmented gas-liquid flows overcome the large axial dispersion effects associated with single-phase laminar flows. Microchannel devices that yielded uniform, stable gas-liquid segmented flows over three orders of magnitude in flow velocity were first developed.
(cont.) Extensive experimental studies of the transport, dynamics and stability of such flows were then conducted with pulsed-laser fluorescent microscopy, optical stereomicroscopy and micro particle image velocimetry (-PIV). Flow segmentation not only reduces axial dispersion, but also allows rapid micromixing of miscible liquids through internal recirculations in the liquid phase. This added functionality is especially useful in syntheses involving colloidal particles that, due to inherently low diffusivity, cannot be rapidly mixed by laminar diffusive techniques. Continuous segmented flow reactors were then developed for the synthesis of colloidal silica and titania particles by sol-gel chemistry. Particle sizes could be tuned by varying the rates of flow of reactants, or by varying the chip temperature. Particle size distributions comparable to or narrower than the corresponding stirred-flask synthesis, with little agglomeration or shape distortion were obtained. Coating of colloidal particles with one or more layers of different materials is used to modify their optical, chemical or surface properties. Core-shell particles are often prepared by controlled precipitation of inorganic precursors onto core particles.
(cont.) Synthesis of such structures requires precise control over process parameters to prevent precipitation of secondary particles of shell material and agglomeration of primary particles. Particles coated with titania are exceptionally difficult to synthesize due to the high reactivity of the titania precursors, which makes controlled precipitation difficult. A novel continuous flow microfluidic reactor with sequential multi-point precursor addition was developed for colloidal overcoating processes. Silica particles were coated with uniform titania layers of tunable thickness by the controlled hydrolysis of titanium ethoxide, with no secondary particle formation or agglomeration. An integrated reactor for continuous silica synthesis and in-situ series overcoating with titania was then developed using a two-level stacked reactor fabrication process. Finally, multi-step nanomaterials synthesis and surface coating with incompatible chemistries requires the development of microfluidic 'unit operations' equivalent to particle filtration. In this context, rapid, continuous microfluidic particle separation was demonstrated using transverse free-flow electrophoresis.
by Saif A. Khan.
Ph.D.
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Corradi, Roberto. « Conducting polymer-silica colloidal composites ». Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263866.

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Nur, Hani. « Colloidal microgels : synthesis, characterisation and applications ». Thesis, University of Greenwich, 2009. http://gala.gre.ac.uk/8163/.

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Four sets of NIPAM and non-NIPAM based colloidal microgels have been synthesized by a surfactant-free emulsion polymerisation (SFEP) technique, which are: (i) poly (NIPAM) based homo-polymer, (ii) poly (NIPAM) based co-polymer, (iii) hydrophobically modified homo-polymer and (iv) hydrophobically modified co-polymer microgels. Poly (NIPAM) based homo-polymer microgels have been studied with respect to their heteroaggregation/heteroflocculation behaviour with oppositely charged polystyrene latex (PS) particles. It has been shown that the particle size, concentration and temperature play an important role in the ionic interaction between oppositely charged microgel and PS latex particles. Some particulate dispersions have shown temperature-dependent reversible flocculation behaviour, which could be applicable in the water industry for the removal of colloidal impurity from water. A strong irreversible aggregation was also observed for some microgel-latex mixtures, which may find useful application in the field of crude oil recovery. Hydrophobically modified homo-polymer and co-polymer microgels have been prepared from a range of novel monomers. The monomers have been chosen with varying hydrophobic chain length in order to manipulate the swelling properties of the resultant particles in different solvents. The dispersibility behaviour of the novel and NIPAM-based microgels has also been studied in different solvents to find their utility in removing water from oil. Colloidal microgel particles have shown successful application in reducing the water content of biodiesel to an acceptable level. Karl Fischer titration results have shown that water level in biodiesel can be reduced below 500 ppm from 1800 ppm by using microgel as water absorbent. According to the EN14214 specification by European Committee 500 ppm is the maximum water level allowed in biodiesel to be useful in combustion engine.
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IMRAN, MUHAMMAD. « Synthesis and Post-synthesis Transformations of Colloidal Semiconductor Nanocrystals ». Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/945513.

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The present PhD thesis focuses on two main classes of semiconductor colloidal nanocrystals, i.e. lead halide perovskite and copper chalcogenides. The former class of semiconductor NCs are promising materials for many high performance optoelectronics applications, as they exhibit a tunable band gap in the range of 1.4 to 2.9 eV and an efficient photoluminescence characterized by narrow emission linewidths and have been explored the most in the last years. Following the standard hot injection based synthesis and selecting a combination of short chain acid (octanoic acid or hexanoic acid) together with alkyl amines (octylamine and oleylamine) we prepared strongly fluorescent CsPbBr3 perovskite nanowires with tuneable width, in the range from 20 nm (exhibiting no quantum confinement, hence emitting in the green) to 3 nm (in the strong quantum-confinement regime, emitting in the blue) for the first time. However the main limitation of the colloidal synthesis protocols that was followed in aforementioned case including the ligand assisted reprecipitation routes which is the second most frequently used method for preparation of LHPs, is that they employ PbX2 (X= Cl, Br, or I) salts as both lead and halide precursors which consequently limit the precise tunability of the amount of reaction species such as metals or halides precursors and are not applicable to entire family of APbX3 (A=FA, MA and Cs; X=Cl, Br, I). To overcome this issue we developed benzoyl halide based colloidal synthesis route i.e broadly applicable to the entire family of LHP NCs and not only ensures the independent tunability of reaction precursors but also maintain the overall integrity of the NCs such as phase purity and high PLQY. Despite the significant advances in synthesis procedures, the control over size monodispersity, shape and phase purity remains another long standing challenge. This is in fact due to the tendency of primary alkyl amine in the form of alkylammonium ions that could compete with Cs+ ions and leads to the anisotropic growth such as NPLs or their use in excess permotes the Pb-depleted Cs4PbX6 phases. We develop here a strategy to achieve size, shape and phase pure CsPbBr3 nanocubes by substituting primary alkyl amines with secondary alkyl amines. We attributed this excellent control over the shape and phase purity to the inability of secondary amines to find the right steric conditions at the surface of the nanocrystals which consequently limits the formation of low dimensional structures. The shape purity and narrow size distribution leads to their ease of self-assembly in superlattices reaching up to 50 microns in lateral dimensions, which are the largest dimensions reported to date for superlattices of LHP NCs. The second class of materials studied here, i.e. copper chalcogenides, are mainly attractive due to their tunable composition via post synthesis chemical transformations, plasmonic properties, low toxicity and environmental friendliness. Taking the advantage of colloidal synthesis and using Cu2S as a template we develop a strategy to obtain novel AuCuS-Cu2S heterostructure through cation exchange, which cannot be realized through conventional synthesis approaches. We further investigated the stability of Cu2S NCs with different dimensionalities and their thermal evolution subsequent to the metal decoration. Interestingly the presence of additional metallic NCs, such as Au and Pt not only improves their thermal stability but also leads to the formation of bi-metallic alloys semiconductor heterostructure.
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Many, Véronique. « Synthèse et design de nanorésonateurs optiques actifs dans le visible ». Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0325.

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L’étude et la réalisation de métamatériaux auto-assemblés possédant une réponse magnétique aux fréquences optiques font l’objet d’un champ de recherche très actif depuis plusieurs années. De nombreux calculs théoriques ont prédit qu’un arrangement dense de briques élémentaires plasmoniques, « les méta-atomes », conduirait à des matériaux à indice négatif actifs dans le domaine du visible. Il a été démontré qu’un nano-objet ayant un coeur de silice décoré de 12 nanoparticules d’or sphériques permettrait d’optimiser le phénomène de magnétisme optique. Ma thèse repose sur l’élaboration de ces objets à partir de particules colloïdales, parfaitement symétriques, constituées d’un coeur de silice et 12 nodules de polystyrène. Ces nodules de PS pouvant être éliminés ultérieurement par dissolution. Ces objets ont permis de fabriquer des particules de silices décorées d’un nombre précis de « patchs » ou de « fossettes ». Ces objets ont été formés en grande quantité. Nous sommes parvenus à rendre les cavités de surface des particules à fossettes collantes pour des germes d’or de 2-3 nm de diamètre et initier leur croissance. Les mesures de propriétés optiques de ces dodécapodes dorés ont reflété le couplage intense existant entre les nanoparticules plasmoniques autour du coeur diélectrique. La possibilité de faire croitre de l’argent à la surface des germes d’or permet de générer des nanorésonateurs avec des modes magnétiques optiques encore plus intenses que ceux observés pour les systèmes à base d’or
Over the last decade, the field of self-assembled metamaterials exhibiting unusual properties such as a magnetic response in the visible range represents a challenging and attracting area. Many simulations reported that a dense arrangement of specific plasmonic sub-units called “meta-atoms”, may lead to a material with a negative refractive index. It was reported by computational modelling that a dodecapod clusters made of a central dielectric core and surrounded by a controlled number of satellites (12 satellites, here) with a specific size can exhibited some interesting properties. Here, the purpose was to fabricate such clusters from colloidal particles, which are perfectly symmetrical, made of a silica core and 12 polystyrene nodules. Subsequently, those polystyrene nodules can be dissolved to get silica particles with a specific number of “patches” or “dimples”. Those objects were synthesized in a large quantity. We were able to make those dimples sticky to tiny gold seed of 2-3 nm size and to grow then for a specific size. Optical measurements reported the strong magnetic coupling in-between the plasmonic nanoparticles around the dielectric core. We also reported that growing silver on tiny gold seeds generates stronger magnetic responses than those observed from gold clusters
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Briggs, Nigel P. « The synthesis and colloidal behaviour of copolymers ». Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328309.

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Young, Robert A. « Synthesis and application of novel colloidal material ». Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/108359/.

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Within this thesis we explore the synthesis of novel colloidal particles for the use as both a thermochromic indicator and opacifiers. Initially in Chapter 1 we describe the synthesis of polystyrene copolymers and the effect the co-monomers have upon the phase transitional temperature within dioctyl phthalate. Co-polymers containing varying mol% of copolymers led to a decrease in the transitional temperatures for the systems. Following the determination of the phase transitions, we touched upon the potential to encapsulate the oils and use them within both a soft fibre and a waterborne latex binder as a thermochromic pigment. In Chapter 2 we looked into the synthesis of hollow non-spherical silica particles and their potential use within both ultrasound imaging and films as an opacifying agent. In Chapter 3 we expand upon the use of the silica shells by dispersing them within a PMMA nanocomposite to determine the effect on the mechanical properties. In Chapter 4 we explored further into the UCST systems shown in Chapter 1 with the addition of specialised dye tagging of the polystyrene chains to obtain a fluorescent changes upon phase transition.
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Livres sur le sujet "Colloidal synthesi"

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Prof, Caruso Frank, dir. Colloids and colloid assemblies : Synthesis, modification, organization, and utilization of colloid particles. Weinheim : Wiley-VCH, 2004.

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Abdelhamid, Elaissari, dir. Colloidal polymers : Synthesis and characterization. New York : M. Dekker, 2003.

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Mourdikoudis, Stefanos, dir. Reducing Agents in Colloidal Nanoparticle Synthesis. Cambridge : Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839163623.

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Hendricks, Mark Patrick. The Synthesis of Colloidal Metal Sulfide Nanocrystals. [New York, N.Y.?] : [publisher not identified], 2015.

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Campos, Michael Paul. The Synthesis and Surface Chemistry of Colloidal Quantum Dots. [New York, N.Y.?] : [publisher not identified], 2017.

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Câmara, Fabricio Vitor, et Leandro J. Ferreira. Hydrogels : Synthesis, characterization and applications. New York : Nova Biomedical, 2012.

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R, Arshady, dir. Polymer synthesis. Berlin : Springer-Verlag, 1994.

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International Symposium on Sol-Gel Processing (1998 Cincinnati, Ohio). Sol-gel synthesis and processing. Westerville, Ohio : American Ceramic Society, 1998.

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M, Aharoni Shaul, American Chemical Society. Division of Polymeric Materials : Science and Engineering. et Symposium on Synthesis, Characterization, and Theory of Polymeric Networks and Gels (1992 : San Francisco, Calif.), dir. Synthesis, characterization, and theory of polymeric networks and gels. New York : Plenum Press, 1992.

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Symposium on Synthesis, Characterization, and Theory of Polymeric Networks and Gels (1992 San Francisco, Calif.). Synthesis, characterization, and theory of polymeric networks and gels. New York : Springer Science+Business Media, LLC, 1992.

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Chapitres de livres sur le sujet "Colloidal synthesi"

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Young, Anda. « Synthetic Colloids ». Dans Small Animal Fluid Therapy, 18–25. GB : CABI, 2022. http://dx.doi.org/10.1079/9781789243406.0004a.

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Jana, Nikhil R. « Chemical Synthetic Methods of Selected Nanoparticles ». Dans Colloidal Nanoparticles, 23–47. Boca Raton : CRC Press, Taylor & Francis Group, 2018. : CRC Press, 2019. http://dx.doi.org/10.1201/9780429165603-3.

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Hilgendorff, M., et M. Giersig. « Synthesis of Colloidal Magnetic Nanoparticles ». Dans Low-Dimensional Systems : Theory, Preparation, and Some Applications, 151–61. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0143-4_13.

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Jana, Nikhil Ranjan. « Chemical Synthesis of Colloidal Gold Nanorod ». Dans Colloidal Gold Nanorods, 13–30. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003245339-2.

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Kashani, John, Richard D. Shih, Thomas H. Cogbill, David H. Jang, Lewis S. Nelson, Mitchell M. Levy, Margaret M. Parker et al. « Synthetic Colloid ». Dans Encyclopedia of Intensive Care Medicine, 2191. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_2259.

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Groeneveld, Esther, et Celso de Mello Donegá. « The Challenge of Colloidal Nanoparticle Synthesis ». Dans Nanoparticles, 145–89. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44823-6_6.

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Lesnyak, Vladimir. « Large-Scale Colloidal Synthesis of Nanoparticles ». Dans 21st Century Nanoscience – A Handbook, 1–1. Boca Raton, Florida : CRC Press, [2020] : CRC Press, 2019. http://dx.doi.org/10.1201/9780367341558-1.

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Kinayyigit, Solen. « CHAPTER 4. Role of Phenols and Phenol Derivatives in the Synthesis of Nanoparticles ». Dans Reducing Agents in Colloidal Nanoparticle Synthesis, 73–96. Cambridge : Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839163623-00073.

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Haldar, Debasish. « CHAPTER 8. Amino Acids and Peptides in Colloidal Nanoparticle Synthesis ». Dans Reducing Agents in Colloidal Nanoparticle Synthesis, 184–218. Cambridge : Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839163623-00184.

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Perotti, Gustavo Frigi, et Luiz Pereira da Costa. « CHAPTER 12. Biological Materials ». Dans Reducing Agents in Colloidal Nanoparticle Synthesis, 316–32. Cambridge : Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839163623-00316.

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Actes de conférences sur le sujet "Colloidal synthesi"

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Amme, M., H. Lang et M. Sto¨ckl. « Different Pathways of Secondary Phase Formation Induced by Colloidal and Dissolved Silica During the Dissolution of UO2 Nuclear Fuel in Leaching Tests ». Dans ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4504.

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We investigated the different dissolution behaviour of UO2 nuclear fuel material in waters containing silica in two different physical and chemical forms (dissolved ions and as SiO2 colloids, respectively) at elevated temperatures (95 °C in autoclaves). It was investigated if SiO2 colloids can act as carrier material for U ions during a interface geochemical dissolution process, a process that might possibly enhance the mobilization of uranium. Herefore, leaching / dissolution tests were conducted in batch reactors, using both dissolved Si (sodium metasilicate solution), as well as synthetic SiO2 colloids (100 nm diameter). Solid materials were examined with scanning electron microscopy (SEM-EDX) after the tests and ICP-OES was used for analysis of concentrations of U and Si in solutions. Thermodynamic calculations were applied for modelling the surface charges of the solid materials. Results show that a treatment with colloidal SiO2 has different effects on the surfaces than a leaching in dissolved silicate solutions. In the presence of colloids, well-crystallized secondary phases containing U and Si (most obviously uranyl silicates) were found on the surfaces, which were attacked by the treatment. This was not the case when dissolved Si was used. SiO2 colloids were partly found to remain on the surfaces after 1000 h at 95 °C. Dissolved U concentrations decreased with increasing Si content in the systems, especially so when colloidal Si was used. Ultrafiltration showed that the greatest part of the dissolved U was associated with Si colloids. A surface charge model suggests that the different effects are due to the development of electrostatic interactions between the UO2 and SiO2 surfaces.
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Wang, Wei. « Modified Carbon Dots with Lowered Retention and Improved Colloidal Stability for Application in Harsh Reservoir Condition ». Dans SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204833-ms.

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Abstract Tracer technology has been increasingly used in inter-well tests to investigate reservoir performance, reservoir connectivity and residual oil saturation for providing useful information to improve decision making in reservoir management. Stable nanoparticle tracers with high-sensitive real-time detectability are highly desired, and as one of the nanoparticles tracers, carbon dots (C-dots) have been studied and tested as nano-agent tracer in field trial for reservoir monitoring. In this research, we report a modified method to synthesize fluorescent C-dots and fluorinated, sulfonated or zwitterionic functional groups were incoprtated into the C-dots. The synthesis reaction occurs at hydrothermal conditions with inexpensive starting materials and is readily to scale up for industrial application. Optical properties of the synthesized colloidal C-dots were studied by UV-visible and fluorescence spectroscopies. Colloidal stability was studied by dynamic light scattering (DLS) measurements, and retention of the C-dots in porous medium was evaluated by adsorption experiment with limestone rock. The synthesized C-dots are readily dispersible in freshwater and synthetic brines and exhibit improved colloidal stability in hot brine and lowered retention in reservoir rocks. In comparison with those C-dots reported in literatures, our results suggest that the synthesized C-dots using the modified procedure have excellent fluorescence properties, improved thermal stability, photostability, and water dispersibility, enabling their use as optically detectable nano-agent tracer in oil field application.
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Gonzales, Gavin P., Arjun Senthil, Gema J. Alas, Nathan J. Withers, Sergei A. Ivanov, Dale L. Huber et Marek Osiński. « Synthesis and characterization of colloidal ZnTe/ZnS quantum dots ». Dans Colloidal Nanoparticles for Biomedical Applications XIV, sous la direction de Wolfgang J. Parak et Marek Osiński. SPIE, 2019. http://dx.doi.org/10.1117/12.2515646.

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Gharde, Shruti I., Arjun Senthil, Mark V. Reymatias, Aadit Sharma, Ciara R. Murphy, Nathan J. Withers, Gennady A. Smolyakov et al. « Colloidal synthesis and characterization of ytterbium-doped YLF nanocrystals ». Dans Colloidal Nanoparticles for Biomedical Applications XVII, sous la direction de Marek Osiński et Antonios G. Kanaras. SPIE, 2022. http://dx.doi.org/10.1117/12.2615365.

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Reymatias, Mark V., Arjun Senthil, Dominic Bosomtwi, Shruti I. Gharde, Gema J. Alas, DeYannah J. Walker, Adreanna G. Rael et al. « Synthesis and characterization of colloidal CdSexS1-x/ZnS quantum dots ». Dans Colloidal Nanoparticles for Biomedical Applications XV, sous la direction de Marek Osiński et Antonios G. Kanaras. SPIE, 2020. http://dx.doi.org/10.1117/12.2553001.

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Lapa, Hugo, Nelson Silva, Alessandro Fantoni, Antonio F. Maçarico, Gabriela Almeida et Elisbete C. B. A. Alegria. « Green synthesis of gold nanoparticles and their deposition on ITO surfaces ». Dans Colloidal Nanoparticles for Biomedical Applications XVI, sous la direction de Marek Osiński et Antonios G. Kanaras. SPIE, 2021. http://dx.doi.org/10.1117/12.2582983.

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Huber, Dale L., Nathan J. Withers, Marek Osinski, Gavin Gonzales, Gema Alas, Alejandro Sandoval, Christina Minetos, Sergei A. Ivanov, Gennady A. Smolakov et Arjun Senthil. « Synthesis and characterization of colloidal ZnTe nanocrystals and ZnTe/ZnSe quantum dots ». Dans Colloidal Nanoparticles for Biomedical Applications XIII, sous la direction de Xing-Jie Liang, Wolfgang J. Parak et Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2299330.

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Senthil, Arjun, Mark V. Reymatias, Gema J. Alas, Shruti I. Gharde, Rafael Castro, Adreanna Rael, DeYannah J. Walker et al. « Synthesis and characterization of near-infrared PbSe/SnS colloidal core-shell quantum dots ». Dans Colloidal Nanoparticles for Biomedical Applications XV, sous la direction de Marek Osiński et Antonios G. Kanaras. SPIE, 2020. http://dx.doi.org/10.1117/12.2555079.

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Fabris, Laura, Manjari Bhamidipati, Kholud Dardir, Ted V. Tsoulos et Supriya Atta. « A new paradigm for gold nanostars : synthesis, characterization, modeling, and biomedical applications (Conference Presentation) ». Dans Colloidal Nanoparticles for Biomedical Applications XIII, sous la direction de Xing-Jie Liang, Wolfgang J. Parak et Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2288538.

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Andre, Pascal, Ge Cheng, Wuzong Zhou, Ross A. Blackley, Ifor D. W. Samuel et David Cole-Hamilton. « Colloidal synthesis of indium nitride nanoparticles ». Dans Nanoepitaxy : Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials. SPIE, 2009. http://dx.doi.org/10.1117/12.826310.

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Rapports d'organisations sur le sujet "Colloidal synthesi"

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Dawood, Farah. Synthesis and Lithography of Colloidal Nanomaterials. Office of Scientific and Technical Information (OSTI), novembre 2014. http://dx.doi.org/10.2172/1163626.

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Semendy, Fred, Gomatam Jaganathan, Nibir Dhar, Sudhir Trivedi, Ishwara Bhat et Yuanping Chen. Colloidal CdTe Nano Crystals Synthesis and Characterization. Fort Belvoir, VA : Defense Technical Information Center, septembre 2008. http://dx.doi.org/10.21236/ada486559.

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Liu, Haitao. Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis. Office of Scientific and Technical Information (OSTI), mai 2007. http://dx.doi.org/10.2172/918668.

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El-Sayed, M. A. The Reactivity and Dynamics of Gaseous Clusters. The Dynamics and Controlled Shaped Synthesis of Gaseous and Colloidal Nanoparticles. Fort Belvoir, VA : Defense Technical Information Center, octobre 1997. http://dx.doi.org/10.21236/ada330161.

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Reimus, P. W. Transport of synthetic colloids through single saturated fractures : A literature review. Office of Scientific and Technical Information (OSTI), juillet 1995. http://dx.doi.org/10.2172/95495.

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Reimus, Paul William. The use of synthetic colloids in tracer transport experiments in saturated rock fractures. Office of Scientific and Technical Information (OSTI), août 1995. http://dx.doi.org/10.2172/100238.

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EVIDENT TECHNOLOGIES TROY NY. High Performance Thermoelectric Materials Using Solution Phase Synthesis of Narrow Bandgap Core/Shell Quantum Dots Deposited Into Colloidal Crystal Thin Films. Fort Belvoir, VA : Defense Technical Information Center, juin 2005. http://dx.doi.org/10.21236/ada434970.

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