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Sonochemical Synthesis of SrTiO 3 Nanocrystals at Low Temperature

Abstract:
Carbon based graphene oxide was synthesized by a modified Hummer’s method with different ratios of graphite to sodium nitrate (NaNO3) of 1:1, 1:2, and 2:1. These variations were carried out to determine which conditions would afford more oxygen functional groups. The products obtained, namely, GO1:1, GO1:2, GO2:1, were characterized by means of powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, elemental analysis, and Raman spectroscopy. XRD revealed that GO2:1 is more crystalline than either GO1:1 or GO1:2, while Raman spectroscopy confirmed the in-phase vibration (G-band) of GO2:1 at 1596 nm and the disorder band (D-band) at 1347 nm. Also, TEM showed the expected layer structure of the graphene oxide sheet. FTIR revealed the presence of oxygen functional groups while the elemental analysis confirmed that GO 2:1 has more oxygen functional groups than GO1:1 and GO1:2. Thus, the synthesis of GO with a limited amount of sodium nitrate provided a more crystalline and oxygen-functionalized material.

Abstract:
Carbon based graphene oxide was synthesized by a modified Hummer’s method with different ratios of graphite to sodium nitrate (NaNO3) of 1:1, 1:2, and 2:1. These variations were carried out to determine which conditions would afford more oxygen functional groups. The products obtained, namely, GO1:1, GO1:2, GO2:1, were characterized by means of powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, elemental analysis, and Raman spectroscopy. XRD revealed that GO2:1 is more crystalline than either GO1:1 or GO1:2, while Raman spectroscopy confirmed the in-phase vibration (G-band) of GO2:1 at 1596 nm and the disorder band (D-band) at 1347 nm. Also, TEM showed the expected layer structure of the graphene oxide sheet. FTIR revealed the presence of oxygen functional groups while the elemental analysis confirmed that GO 2:1 has more oxygen functional groups than GO1:1 and GO1:2. Thus, the synthesis of GO with a limited amount of sodium nitrate provided a more crystalline and oxygen-functionalized material.

Title of Talk: Synthesis of Graphene Oxide under Differing Conditions and its Characterization

sonochemical synthesis pathway for ..

Title of Talk:Synthesis of Graphene Oxide under Differing Conditions and its Characterization

Abstract:
The current interest of our research group is largely focused on the development and understanding of precipitated crystalline organometallic compounds. We are placing a strong emphasis in the study of the synthetic procedures, the morphology, and on the structural determination of such compounds. Special importance is engaged in the preparation coordination polymers crystallized from solutions of supercritical CO2, (scCO2), where the use of a co-solvent is occasionally employed depending on reagents solubility [1-3]. The correct selection of experimental conditions in the scCO2 reactive crystallization technique, allows a precipitation known from other methodologies, as well as new crystalline phases. This procedure leads to the crystallization of stable hierarchical nanoestructures involving micro and mesoporosity. As the preparation of the crystalline materials is carried out in scCO2, these obtained with microporous structures were recovered activated, i.e., with open volume, since the removal of any guest molecules from the framework is carried out by simple depressurization. This method is expected to have many potential applications in the development of green crystallization techniques for coordination polymers synthesis.

Abstract:
This work focuses on the synthesis and the modification of mesoporous silica SBA-15 using in-situ polymerization of polypyrrole. In order to study the effect of polypyrrole contents on the structural, textural and dye adsorption properties, several polypyrrole contents were dispersed and analyzed by various techniques such as X-ray diffraction (XRD), nitrogen sorption at 77 K, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and scanning electronic microscopy (SEM). The obtained materials were tested for the removal of cationic and anionic dyes. The effect of pH, contact time, adsorbent dose, and initial dye concentration were investigated and discussed in terms of adsorption efficiency. The obtained results show that the adsorption efficiency of MO dye is preferably carried out by the nanocomposites PPY/SBA-15(50%) containing higher polypyrrole content. Whereas, the adsorption of MB is oriented by the parent material SBA-15 and the nanocomposite PPY/SBA-15(1%) containing lower content of polypyrrole. The experimental data were verified by the Langmuir and Freundlich isotherms, and the kinetic data were fitted by pseudo-first-order and pseudo-second-order models. The obtained results showed that the adsorption of the both dye by nanocomposite PPY/SBA-15 followed Langmuir adsorption isotherm models and pseudo-second-order kinetics. The adsorbed amounts recorded for MO and MB dyes are 41.66 mg/g and 58.82 mg/g, respectively.

Perovskite oxide nanocrystals: Synthesis, …

Title of Talk: Synthesis and properties of Se-containing organo-inorganic sorbents surface imprinted with biologically active substances

Title of Talk: SYNTHESIS OF EUROPIUM DOPED HYDROXYAPATITE NANOPARTICLES FOR CELL LABELING

Title of Talk: Controlled Synthesis and Size Distribution of ZIF-8, ZIF-67 and their Mixed Metal Derivatives and their Photocatalytic Properties

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SnSe Nanocrystals: Synthesis, ..


Sodium chloride-assisted green synthesis of a 3D …

Biography:
Assunta Marrocchi is currently Associate Professor at the Department of Chemistry, Biology and Biotechnology of the University of Perugia. She earned a PhD in Chemical Sciences at the same Institution. In 2008 she conducted research at Northwestern University, Evanston, IL (USA), as visiting scientist. Her research expertise and interests encompass the fields of 1) organic functional materials, with a special emphasis on the sustainable synthesis of photoactive organics for solar cells; 2) biomass sustainable conversion to high added value chemicals.

approach for the synthesis of nanocrystals.

Dipartimento di Chimica, Biologia e BiotecnologieLaboratory of Green Synthetic Organic Chemistry – Università degli Studi di PerugiaVia Elce di Sotto 8, 06123 Perugia (Italy)

Bacterial Biosynthesis of Cadmium Sulfide Nanocrystals

Abstract:
Zeolitic imidazolate frameworks (ZIFs), a subclass of metal-organic frameworks (MOFs), havebeen recently employed in various fields such as gas separation, catalysis, water purification anddrug delivery.1 Their high importance is due to their chemical and thermal stability in addition tothe flexibility of their design. ZIFs have been synthesized solvothermally or at room temperatureusing organic solvents (e.g. methanol, DMF) or pure water.2 The control of size and morphologyof crystals has been achieved using reverse microemulsion methods, microwave, ultrasoundassistedsyntheses and coordination modulation methods.1-3 Herein, we investigate a newsynthesis method where ZIF crystals are produced using the reaction-diffusion framework (RDF)in a gel medium at room temperature. The method is based on the diffusion of an outer solutionof the organic linker or mixed linkers into an agar gel containing the inner metal ions Zn(II)and/or Co(II) where a precipitation reaction takes place leading to the formation of the ZIFcrystals. A propagating supersaturation wave, initiated at the interface between the outer solutionand the gel matrix leads to a precipitation front endowed with a gradient of crystal sizes rangingbetween 100 nm and 55 μm along the same reaction tube. While the precipitation fronts of ZIF-8 and ZIF-67 travel the same distance for the same initial conditions, ZIF-8 crystals therein areconsistently smaller than the ZIF-67 crystals due to the disparity of their rate of nucleation andgrowth. The effects of temperature, the concentration of the reagents, and the thickness of thegel matrix on the growth of the ZIF crystals are investigated. We also show that by using RDF,we can envisage the formation mechanism of the ZIF crystals, which consists of the aggregationof ZIF nanospheres to form the ZIF-8 dodecahedrons. Moreover, using RDF the formation of asolid-solution ZIF via the incorporation of Co(II) and Zn(II) cations within the same frameworkis achieved in a controlled manner. Finally, we demonstrate that doping ZIF-8 by Co(II)enhances the photodegradation of methylene blue dye under visible light irradiation in theabsence of hydrogen peroxide.

Bacterial Biosynthesis of Cadmium Sulfide ..

Dipartimento di Chimica, Biologia e BiotecnologieLaboratory of Green Synthetic Organic Chemistry – Università degli Studi di PerugiaVia Elce di Sotto 8, 06123 Perugia (Italy)

Synthesis of CdSe Nanocrystals by the Pyrolysis …

Biography:
Dr. Naoufel Khemiri is an Assistant Professor at El Manar Preparatory Engineering Institute in Tunisia. He obtained his Ph.D thesis in “Condensed Matter Physics” from the Faculty of Sciences of Tunis (FST), University of Tunis El Manar, Tunisia in 2012. He is now member of Photovoltaic and Semiconductor Materials Laboratory (ENIT, Tunis, Tunisia). He works mainly on the synthesis and the characterization of ternary and quaternary compounds (CuInS2, Zn(S,O), SnSb4S7, Cu2ZnSnS4 and Cu2ZnxFe1-xSnS4) for opto-electronic and solar cell applications. He published more than 20 papers in International Journals with impact factor and participated in several international conferences in materials science.

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