Sol-Gel Synthesis and Microstructure Analysis of Amino-Modified Hybrid Silica Nanoparticles from Aminopropyltriethoxysilane and Tetraethoxysilane

2009 ◽  
Vol 92 (9) ◽  
pp. 2074-2082 ◽  
Author(s):  
Song Chen ◽  
Satoshi Hayakawa ◽  
Yuki Shirosaki ◽  
Eiji Fujii ◽  
Koji Kawabata ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Sol Gel ◽  
Microstructure Analysis ◽  
Hybrid Silica ◽  
Sol Gel Synthesis

Sol-Gel Synthesis and Preliminary Characterizations of Novel Silica Hybrid Xerogels

2013 ◽  
Vol 594-595 ◽  
pp. 1009-1014
Author(s):  
S.A. Syed Nuzul Fadzli ◽  
S. Roslinda ◽  
Z. Firuz
Keyword(s):  
Sodium Alginate ◽  
Calcium Oxide ◽  
Sol Gel ◽  
Silica Xerogel ◽  
Particle Sizes ◽  
Mesoporous Composite ◽  
Hybrid Silica ◽  
Hybrid Xerogels ◽  
Mild Temperature ◽  
Sol Gel Synthesis

Hybrid silica xerogel mesoporous composite was synthesized by a mild temperature acid catalysed sol-gel route where a natural copolymer; sodium alginate (Na-COOH) together with calcium oxide (CaO) powder were incorporated into silica sol precursor prior to gel formation. For this study, bulk xerogels samples were prepared with the amount of silica precursor and the natural copolymer was fixed meanwhile the loading of calcium oxide was varied at 10 and 20 wt%. The monolith silica was also synthesized as control parameter. The preliminary properties were investigated using XRD, FTIR and SEM together with EDS for elemental analysis. The calcium oxide powder used in this study was prepared from calcium hydroxide, CaOH compound, which was previously calcined at 1000°C for 3 hours in normal air. The component of calcium oxide and sodium alginate were found to be uniformly dispersed in matrixes without affecting the cross-linked silica formation. As the presence of the components in the silica matrixes, the synthesized hybrid xerogels were found to be crack-free, structurally amorphous and physically opaque. Furthermore, the hybrid xerogels samples were found to have denser bodies, smoother surface, and decreased in particle sizes and thus might produced less brittleness in nature compared to the monolith xerogels.

A new method for loading mesoporous silica nanoparticles with drugs: Sol–gel synthesis using drug micelles as a template

2016 ◽  
Vol 78 (5) ◽  
pp. 586-595 ◽  
Author(s):  
O. V. Dement’eva ◽  
I. N. Senchikhin ◽  
M. E. Kartseva ◽  
V. A. Ogarev ◽  
A. V. Zaitseva ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Sol Gel ◽  
New Method ◽  
Sol Gel Synthesis

Hybrid spiropyran–silica nanoparticles with a core-shell structure: sol–gel synthesis and photochromic properties

2010 ◽  
Vol 20 (42) ◽  
pp. 9370 ◽  
Author(s):  
Joachim Allouche ◽  
Aurélie Le Beulze ◽  
Jean-Charles Dupin ◽  
Jean-Bernard Ledeuil ◽  
Sylvie Blanc ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Shell Structure ◽  
Sol Gel ◽  
Core Shell ◽  
Photochromic Properties ◽  
Core Shell Structure ◽  
Sol Gel Synthesis

Silica nanoparticles doped by cobalt(II) sulfosubstituted phthalocyanines: Sol–gel synthesis and catalytic activity

2014 ◽  
Vol 406 ◽  
pp. 5-10 ◽  
Author(s):  
A.A. Voronina ◽  
I.A. Tarasyuk ◽  
Yu.S. Marfin ◽  
A.S. Vashurin ◽  
E.V. Rumyantsev ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Silica Nanoparticles ◽  
Sol Gel ◽  
Sol Gel Synthesis

Sol-Gel Synthesis of Amorphous Silica Nanoparticles: Study of the Process Parameters Influence on Structure and Particle Size Distribution

2018 ◽  
Vol 912 ◽  
pp. 77-81
Author(s):  
Renata Deliberato Aspasio ◽  
Jairo Freitas da Silva Jr. ◽  
Roger Borges ◽  
Juliana Marchi
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Silica Nanoparticles ◽  
Size Distribution ◽  
Functional Groups ◽  
Process Parameters ◽  
Amorphous Silica ◽  
Sol Gel ◽  
Molar Ratio ◽  
Sol Gel Synthesis

The synthesis of silica particles at the nanoscale through the sol-gel method is of great interest due to their potential use in industrial applications. The Stöber method is the most used method for the silica nanoparticles production using ammonia as a catalyst. This work studied the sol-gel synthesis of amorphous silica nanoparticles described by Stöber, in order to evaluate the influence of the variation of the process parameters (molar ratio water/TEOS = 25 and 55, reagent feed rate = 0.6 mL/min and 18 mL/min, pH = 12 and 9 and reaction time of 0, 5, 30, 60 and 120 minutes) on the particle size distribution and structural functional groups. The particle size distribution was analyzed by dynamic light scattering (DLS) and the structural functional groups was analyzed by infrared spectroscopy through Fourier transform (FTIR). The molar ratio water/TEOS influenced the functional groups presents and the time influenced the particle diameter distribution. It was not possible to identify the influence of the feed rate and pH in the results. The particle diameters found were between 200-500nm. This result may be occurred due to mass diffusion and/or nanoparticles aggregation.

scholarly journals Nanocarriers of Eu3+ doped silica nanoparticles modified by APTES for luminescent monitoring of cloxacillin

2021 ◽  
Vol 8 (5) ◽  
pp. 760-775
Author(s):  
João Otávio Donizette Malafatti ◽  
◽  
Thamara Machado de Oliveira Ruellas ◽  
Mariana Rodrigues Meirelles ◽  
Adriana Coatrini Thomazi ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Sol Gel ◽  
Surface Reactivity ◽  
Adsorptive Capacity ◽  
Mole Percent ◽  
Alternative Option ◽  
Low Concentrations ◽  
Model Drug ◽  
Drug Incorporation ◽  
Sol Gel Synthesis

<abstract> <p>Drug nanocarriers have been continuously improved to promote satisfactory release control. In this sense, luminescent materials have become an alternative option in clinical trials due to their ability to monitor drug delivery. Among the nanocarriers, silica stands out for structural stability, dispersibility, and surface reactivity. When using ceramic nanocarriers, one of the challenges is their interaction and selectivity capability for organic molecules, such as drugs. In order to overcome such adversity, superficial modifications can be carried out to enable a higher affinity for the desired drug. Thus, the present study aimed to obtain silica nanoparticles (NPs) doped with low concentrations of europium (III) superficially modified by (3-aminopropyl)triethoxysilane (APTES) to assess their interaction with the model drug cloxacillin benzathine. This drug was chosen because it is part of the ampicillin family and is commonly used in several treatments. Near-spherical and homogeneous silica NPs were obtained via sol-gel synthesis, with particle sizes of approximately 21 nm. It was possible to verify the fluorescence capacity of the silica NPs when doped with europium (III) in a mole percent that varied from 0.5 to 3.0%. A 10% volume percent of APTES caused the silica nanoparticles to increase the degree of hydrophobicity, with a shift in the contact angle from 8° to 51°. After surface modification by APTES, the silica nanocarrier (10 g·L<sup>-1</sup>) achieved a satisfactory degree of CLOX incorporation (25 g·L<sup>-1</sup>), increasing the adsorptive capacity to values above 50%. Therefore, silica NPs doped with europium (III) in a low percent of 0.5% (mole) modified by APTES showed promising results as an alternative option for trials and clinical studies of drug incorporation.</p> </abstract>

Inorganic-organic Hybrid Materials for Real 3-D Sub-νm Lithography

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Houbertz ◽  
J. Schulz ◽  
L. Fröhlich ◽  
G. Domann ◽  
M. Popall ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Sol Gel ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Hybrid Polymer ◽  
Organic Hybrid ◽  
Two Photon ◽  
Applied Technology ◽  
Scale Structures ◽  
Sol Gel Synthesis

AbstractReal 3-D sub-νm lithography was performed with two-photon polymerization (2PP) using inorganic-organic hybrid polymer (ORMOCER®) resins. The hybrid polymers were synthesized by hydrolysis/polycondensation reactions (modified sol-gel synthesis) which allows one to tailor their material properties towards the respective applications, i.e., dielectrics, optics or passivation. Due to their photosensitive organic functionalities, ORMOCER®s can be patterned by conventional photo-lithography as well as by femtosecond laser pulses at 780 nm. This results in polymerized (solid) structures where the non-polymerized parts can be removed by conventional developers.ORMOCER® structures as small as 200 nm or even below were generated by 2PP of the resins using femtosecond laser pulses. It is demonstrated that ORMOCER®s have the potential to be used in components or devices built up by nm-scale structures such as, e.g., photonic crystals. Aspects of the materials in conjunction to the applied technology are discussed.

Sol-Gel Synthesis, Structure and Optical Properties of Nickel-Manganese Ferrites

2019 ◽  
Vol 11 (3) ◽  
pp. 03021-1-03021-5
Author(s):  
V. S. Bushkova ◽  
◽  
I. P. Yaremiy ◽  
B. K. Ostafiychuk ◽  
N. I. Riznychuk ◽  
...  
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Sol Gel Synthesis ◽  
Nickel Manganese
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