First Eu3+@Organo-Si(HIPE) Hybrid Macro-Mesocellular Foams Generation and Associated Luminescent Properties

2008 ◽  
Vol 1111 ◽  
Author(s):  
Nicolas Brun ◽  
Béatriz Julian-Lopez ◽  
Peter Hesemann ◽  
Guillaume Laurent ◽  
Hervé Deleuze ◽  
...  
Keyword(s):  
Nitrogen Adsorption ◽  
Luminescent Properties ◽  
Condensation Process ◽  
Large Set ◽  
Porous Networks ◽  
Organically Modified Silicates ◽  
Internal Phase ◽  
One Step ◽  
Emulsion Process ◽  
Hybrid Foams

AbstractUsing both β-diketone and malonamide organosilane derivatives and silica Si-HIPE macro-mesocellular foams (acronym refers to the High Internal Phase Emulsion process), organically modified silicates (ORMOSILs) with chelating functionality have been synthesized. The organic functionalities have been anchored to the silica porous networks by both a two-steps grafting method, relating to grafted gOrgano-Si(HIPE), and a one-step co-condensation process, relating to Organo-Si(HIPE). The loading of monoliths by lanthanides was performed by impregnation of an europium (III) salt in solution, leading to a new Eu3+@(g)Organo-Si(HIPE) hybrid foams series. The resulting materials have been thoroughly characterized via a large set of techniques such as SEM, TEM, SAXS, mercury intrusion porosimetry, nitrogen adsorption, FTIR and 29Si CP MAS NMR. Luminescence behavior of this Eu3+@Organo-Si(HIPE) series was also studied and the effects of environment and europium concentration will be discussed.

scholarly journals Carbon-coated titania nanostructured particles: Continuous, one-step flame-synthesis

2003 ◽  
Vol 18 (11) ◽  
pp. 2670-2676 ◽  
Author(s):  
Hendrik K. Kammler ◽  
Sotiris E. Pratsinis
Keyword(s):  
Crystal Size ◽  
Nitrogen Adsorption ◽  
Titanium Tetraisopropoxide ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Nanostructured Particles ◽  
Carbon Particles ◽  
Transmission Electron ◽  
Carbon Coated ◽  
One Step

Concurrent synthesis of titania-carbon nanoparticles (up to 52 wt.% in C) was studied in a diffusion flame aerosol reactor by combustion of titanium tetraisopropoxide and acetylene. These graphitically layered carbon-coated titania particles were characterized by high-resolution transmission electron microscopy (HRTEM), with elemental mapping of C and Ti, x-ray diffraction (XRD), and nitrogen adsorption [Brunauer-Emmett-Teller (BET)]. The specific surface area of the powder was controlled by the acetylene flow rate from 29 to 62 m2/g as the rutile content decreased from 68 to 17 wt.%. Light blue titania suboxides formed at low acetylene flow rates. The average XRD crystal size of TiO2 decreased steadily with increasing carbon content of the composite powders, while the average BET primary particle size calculated from nitrogen adsorption decreased first and then approached a constant value. The latter is attributed to the formation of individual carbon particles next to carbon-coated titania particles as observed by HRTEM and electron spectroscopic imaging.

One-step synthesis and properties of MnOx/TiO2 nanocomposites prepared by chemical vapor condensation process

2013 ◽  
Vol 233 ◽  
pp. 131-136 ◽  
Author(s):  
Eunseuk Park ◽  
Sungmin Chin ◽  
Yeon Seok Kim ◽  
Gwi-Nam Bae ◽  
Jongsoo Jurng
Keyword(s):  
Chemical Vapor ◽  
Vapor Condensation ◽  
Condensation Process ◽  
Chemical Vapor Condensation ◽  
One Step

scholarly journals Universal direct patterning of colloidal quantum dots by (extreme) ultraviolet and electron beam lithography

Nanoscale ◽  
2020 ◽  
Vol 12 (20) ◽  
pp. 11306-11316
Author(s):  
Christian D. Dieleman ◽  
Weiyi Ding ◽  
Lianjia Wu ◽  
Neha Thakur ◽  
Ivan Bespalov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Beam ◽  
Electron Beam Lithography ◽  
Extreme Ultraviolet ◽  
Luminescent Properties ◽  
Colloidal Quantum Dots ◽  
Direct Patterning ◽  
One Step ◽  
Patterning Technique

A general, one-step patterning technique for colloidal quantum dots by direct optical or e-beam lithography. Photons (5.5–91.9 eV) and electrons (3 eV–50 kV) crosslink and immobilize QDs down to tens of nm while preserving the luminescent properties.

Aqueous chemical grafting of modified-PEG onto maghemite nanoparticles: Influence of grafting conditions

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Claire-Hélène Brachais ◽  
Ling Hu ◽  
Diana Hach ◽  
Denis Chaumont ◽  
Aurélien Percheron ◽  
...  
Keyword(s):  
Covalent Bond ◽  
Nitrogen Adsorption ◽  
Average Diameter ◽  
Size Exclusion ◽  
Maghemite Nanoparticles ◽  
Chemical Grafting ◽  
Exclusion Chromatography ◽  
One Step ◽  
Aqueous Conditions ◽  
Xrd And Tem

AbstractThe synthesis of maghemite nanoparticles coated with triethoxysilanemonomethylether- PEG (Si-mPEG), is presented in aqueous conditions, by the “grafting to” process. This procedure is performed in one step, starting from anchored polymer and native nanoparticles. The maghemite nanoparticles obtained were first identified by XRD and the average diameter is about 10 nm according to the Nitrogen adsorption, XRD and TEM techniques. The nature of the catalysts (acetic acid, triethylamine, NH4OH and dibutyl-tin-dilaurate) used for the establishment of the covalent bond between the γ-Fe2O3 particles and the SimPEG, as well as the influence of the temperature and the reaction time, were evaluated on the grafting rate of the particles in water by TGA and FTIR techniques. Using the size exclusion chromatography, SEC technique, we showed that the monomethoxy-PEG was resistant to mild acidic up to strong basic conditions. The best ratio “time/amount of polymer” for the highest grafting rate was the use of tinbased organometallic compound (DBTL) at 80 °C during 48 h. In these conditions, a grafting rate of 54 % is achieved.

One-step synthesis and near-infrared luminescent properties of Er3+and Ni2+doped single-crystalline Al18B4O33nanorods

2008 ◽  
Vol 20 (3) ◽  
pp. 035604 ◽  
Author(s):  
Hong-Tao Sun ◽  
Fumiaki Shimaoka ◽  
Minoru Fujii ◽  
Noriko Nitta ◽  
Minoru Mizuhata ◽  
...  
Keyword(s):  
Near Infrared ◽  
Luminescent Properties ◽  
Single Crystalline ◽  
One Step

Polyurethane-silica hybrid foams from a one-step foaming reaction, coupled with a sol-gel process, for enhanced wound healing

2017 ◽  
Vol 79 ◽  
pp. 866-874 ◽  
Author(s):  
Eun-Ho Song ◽  
Seol-Ha Jeong ◽  
Ji-Ung Park ◽  
Sukwha Kim ◽  
Hyoun-Ee Kim ◽  
...  
Keyword(s):  
Wound Healing ◽  
Sol Gel ◽  
Sol Gel Process ◽  
One Step ◽  
Hybrid Foams ◽  
Silica Hybrid

Ultralight Silica Foams with a Hierarchical Pore Structure via a Surfactant-Free High Internal Phase Emulsion Process

Langmuir ◽  
2018 ◽  
Vol 34 (35) ◽  
pp. 10381-10388 ◽  
Author(s):  
Shuhua Tu ◽  
Yongliang Zhao ◽  
Haotian Tan ◽  
Heng Yu ◽  
Xiaomin Zhu ◽  
...  
Keyword(s):  
Pore Structure ◽  
High Internal Phase Emulsion ◽  
Hierarchical Pore Structure ◽  
Internal Phase ◽  
Emulsion Process ◽  
Hierarchical Pore

scholarly journals Hybrid mesoporous silica with controlled drug release

2019 ◽  
Vol 84 (9) ◽  
pp. 1027-1039 ◽  
Author(s):  
László Almásy ◽  
Ana-Maria Putz ◽  
Qiang Tian ◽  
Gennady Kopitsa ◽  
Tamara Khamova ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Mesoporous Silica ◽  
Drug Loading ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Controlled Drug Release ◽  
Ammonium Bromide ◽  
Structure Directing Agent ◽  
One Step

The mesoporous silica particles were prepared by the sol?gel method in one-step synthesis, in acidic conditions, from tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES), varying the mole ratio of the silica precursors. Nitric acid was used as catalyst at room temperature and hexadecyltrimethyl ammonium bromide (CTAB) as structure directing agent. Optical properties, porosity and microstructure of the materials in function of the MTES/TEOS ratio were evaluated using infrared spectroscopy, nitrogen adsorption and small angle X-ray scattering. All materials showed the ordered pore structure and the high specific surfaces, making them suitable as the drug delivery systems. Drug loading and release tests using ketoprofen were performed to assess their performance for drug delivery applications. The amount of the methylated precursor used in the synthesis had little effect on the drug loading capacity, but had a strong influence on the initial rate of the drug release.

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