Influence of synthesis and processing conditions on the release behavior and stability of sol–gel derived silica xerogels embedded with bioactive compounds

Il Farmaco ◽  
2005 ◽  
Vol 60 (8) ◽  
pp. 675-683 ◽  
Author(s):  
M. Morpurgo ◽  
D. Teoli ◽  
B. Palazzo ◽  
E. Bergamin ◽  
N. Realdon ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Sol Gel ◽  
Processing Conditions ◽  
Release Behavior ◽  
Silica Xerogels ◽  
Synthesis And Processing

The effect of Na2CO3, NaF and NH4OH on the stability and release behavior of sol–gel derived silica xerogels embedded with bioactive compounds

2010 ◽  
Vol 6 (6) ◽  
pp. 2246-2253 ◽  
Author(s):  
M. Morpurgo ◽  
D. Teoli ◽  
M. Pignatto ◽  
M. Attrezzi ◽  
F. Spadaro ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Sol Gel ◽  
Release Behavior ◽  
Silica Xerogels ◽  
The Stability

In Vitro Release Behavior of Toremifene Citrate from Sol-Gel Processed Sintered Silica Xerogels

1999 ◽  
Vol 25 (8) ◽  
pp. 955-959 ◽  
Author(s):  
Manja Ahola ◽  
Pirjo Kortesuo ◽  
Ilkka Kangasniemi ◽  
Juha Kiesvaara ◽  
Antti Yli-Urpo
Keyword(s):  
Sol Gel ◽  
In Vitro Release ◽  
Release Behavior ◽  
Silica Xerogels ◽  
Vitro Release

scholarly journals Small-angle scattering investigation of silica xerogels and sonogels prepared with ionic liquid pyridinium tetrafluoroborate

2017 ◽  
Vol 11 (3) ◽  
pp. 229-233 ◽  
Author(s):  
László Almásy ◽  
Ana-Maria Putz ◽  
Adél Len ◽  
Josef Plestil ◽  
Cecilia Savii
Keyword(s):  
Ionic Liquid ◽  
Small Angle ◽  
Sol Gel ◽  
Molar Ratio ◽  
Strong Increase ◽  
Silica Xerogels ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Gel Processing ◽  
Functionalized Alkoxide

Silica matrices were prepared via acid catalysed sol-gel processing augmented with sonocatalysis. As silica precursors, a mixture of tetra-functionalized alkoxide (TMOS) and three-functionalized alkoxide methyl-trimethoxysilane (MTMS) were employed. Ionic liquid N-butyl-3-methylpyridinium tetrafluoroborate ([bmPy][BF4]), was used in various proportions, aiming to catalyse the sol-gel reactions, and to influence the mesoporous silica materials properties, serving as pore template. Small-angle neutron (SANS) and small-angle X-ray scattering (SAXS) techniques were used to explore the xerogels and sonogels microstructure evolution as a function of the IL/Si molar ratio. The results show a strong increase of the primary particle size under the influence of the ionic liquid. Ultrasonic agitation leads to further size increase by ca. 10%.

scholarly journals Degradation of Cu nanowires in a low-reactive plasma environment

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Diego S. R. Coradini ◽  
Matheus A. Tunes ◽  
Thomas M. Kremmer ◽  
Claudio G. Schön ◽  
Peter J. Uggowitzer ◽  
...  
Keyword(s):  
Single Crystal ◽  
Electronic Devices ◽  
Processing Conditions ◽  
Cu Nanowires ◽  
Plasma Environment ◽  
Mechanical And Electrical Properties ◽  
Reactive Plasma ◽  
Synthesis And Processing ◽  
Solid Nucleation ◽  
Nucleation And Growth Mechanism

Abstract The quest for miniaturisation of electronic devices is one of the backbones of industry 4.0 and nanomaterials are an envisaged solution capable of addressing these complex technological challenges. When subjected to synthesis and processing, nanomaterials must be able to hold pristine its initial designed properties, but occasionally, this may trigger degradation mechanisms that can impair their application by either destroying their initial morphology or deteriorating of mechanical and electrical properties. Degradation of nanomaterials under processing conditions using plasmas, ion implantation and high temperatures is up to date largely sub-notified in the literature. The degradation of single-crystal Cu nanowires when exposed to a plasma environment with residual active O is herein investigated and reported. It is shown that single-crystal Cu nanowires may degrade even in low-reactive plasma conditions by means of a vapour–solid–solid nucleation and growth mechanism.

Synthesis of Mn2+ Doped CdS Nanocrystals Embedded in a Sol-Gel Silica Matrix: Characterization of the Luminescence Activator

1996 ◽  
Vol 452 ◽  
Author(s):  
G. Counio ◽  
S. Esnouf ◽  
T. Gacoin ◽  
P. Barboux ◽  
A. Hofstaetter ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Sol Gel ◽  
Silica Matrix ◽  
Silica Xerogels ◽  
Cds Nanocrystals ◽  
Bright Luminescence

AbstractMn2+-doped CdS nanocrystals (1.2 to 2.4 nm in diameter) embedded in organic-inorganic silica xerogels have been synthesized. Extensive studies (EXAFS, ESR and ENDOR) allow us to localize the ions responsible for the bright luminescence observed in such materials (quantum yield of 7%). The average number of Mn2+ per nanocrystal is in the 0.2–0.8 range, and the emission arises from an energy transfer from surface trapped carriers to Mn2+ ions.

Preparation of β–SiC Nanorods with and Without Amorphous SiO2 Wrapping Layers

1998 ◽  
Vol 13 (9) ◽  
pp. 2533-2538 ◽  
Author(s):  
G. W. Meng ◽  
L. D. Zhang ◽  
C. M. Mo ◽  
S. Y. Zhang ◽  
Y. Qin ◽  
...  
Keyword(s):  
Carbothermal Reduction ◽  
Carbon Nanoparticles ◽  
Sol Gel ◽  
Silica Xerogels ◽  
Amorphous Sio2

Preparation of β–SiC nanorods with and without amorphous SiO2 wrapping layers was achieved by carbothermal reduction of sol-gel derived silica xerogels containing carbon nanoparticles. The β–SiC nanorods with amorphous SiO2 wrapping layers were obtained by carboreduction at 1650 °C for 1.5 h, and at the end of 1.5 h the temperature was steeply raised to 1800 °C and held for 30 min; they are typically up to 20 µm in length. The diameters of the center thinner β–SiC nanorods within the amorphous SiO2 wrapping layers are in the range 10–30 nm, while the outer diameters of the corresponding amorphous SiO2 wrapping layers are between 20 and 70 nm. The β–SiC nanorods without amorphous SiO2 wrapping layers were produced by carbothermal reduction only at 1650 °C for 2.5 h, and their diameters are in agreement with those of the center thinner β–SiC nanorods wrapped in amorphous SiO2 layers. Large quantities of SiC rod nuclei and the nanometer-sized nucleus sites on carbon nanoparticles are both favorable to the formation of much thinner β–SiC nanorods. The formation of the outer amorphous SiO2 wrapping layer is from the combination reaction of decomposed SiO vapor and O2.

Chemical Processing and Properties of Nanocrystalline BaTiO3

1992 ◽  
Vol 271 ◽  
Author(s):  
Z. Xu ◽  
H. K. Chae ◽  
M. H. Frey ◽  
D. A. Payne
Keyword(s):  
Grain Size ◽  
Thermal Processing ◽  
Room Temperature ◽  
Sol Gel ◽  
Thin Layers ◽  
Silicon Substrates ◽  
Chemical Processing ◽  
Temperature Structure ◽  
Processing Conditions ◽  
Gel Processing

ABSTRACTBarium titanate (BaTiO3) thin layers were prepared by sol-gel processing. Details are reported for the synthesis route from methoxyethoxide precursors. Partially hydrolyzed solutions were spin-cast onto metallized silicon substrates, and a multilayering technique was used to develop sub-micron structures. Information is reported on the thermal processing conditions used and the development of structure. Crystallization started at 600°C and was fully developed by 700°C. The room temperature structure was cubic, and the grain size was 25–50 nm. Details are reported for the dielectric properties. Ferroelectricity was not observed. Dielectric constant (200–300) increased with increasing grain size, and was stable with respect to temperature, field and frequency. The properties are attractive for potential integrated capacitor applications.

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