Sol-gel synthesis of hybrid silicon dioxide-poly(ethylene imine) organoinorganic nanocomposite passing into a mesoporous state upon thermal treatment

2008 ◽  
Vol 70 (1) ◽  
pp. 48-54 ◽  
Author(s):  
T. A. Nefedova ◽  
A. V. Agafonov
Keyword(s):  
Thermal Treatment ◽  
Silicon Dioxide ◽  
Sol Gel ◽  
Ethylene Imine ◽  
Hybrid Silicon ◽  
Poly Ethylene ◽  
Sol Gel Synthesis

Characterisation of sol-gel-based hybrid silicon dioxide/heteroarylthiazole dyes on polyamide fabric

2012 ◽  
Vol 128 (4) ◽  
pp. 276-282
Author(s):  
Ming-Shien Yen ◽  
Mu-Cheng Kuo ◽  
Chien-Wen Chen
Keyword(s):  
Silicon Dioxide ◽  
Sol Gel ◽  
Polyamide Fabric ◽  
Hybrid Silicon

scholarly journals A Water-Based Synthesis of Hybrid Silica/Hyperbranched Poly(ethylene imine) Nanopowder for Heavy Metal Sorption from Aqueous Solutions

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Ioanna Kitsou ◽  
Athena Tsetsekou
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Sol Gel ◽  
Ethylene Imine ◽  
Heavy Metal Sorption ◽  
Hyperbranched Poly ◽  
Water Based ◽  
Sorption From Aqueous Solutions ◽  
Poly Ethylene

A novel hybrid, water-based, sol-gel method was developed for the synthesis of functionalized silica with advanced adsorptive capacities towards heavy metal ions. The study employs the hyperbranched poly(ethylene imine) (HBPEI) as a reactive template for the synthesis of silica. The reaction was followed by FTIR, whereas the material was evaluated in terms of its microstructure and adsorptive properties. The results revealed a very potent adsorbent that can remove heavy metal ions (namely, Pb, Cu, and Zn) from water in a fast and efficient way. Greater selectivity was observed for lead, whereas the maximum adsorption capacities calculated from the Langmuir model were 833.3, 502.5, and 193.4 mg/g for lead, copper, and zinc, respectively.

Enhanced tribological properties of bismaleimides with a novel hybrid silicon dioxide containing amino groups

2020 ◽  
Vol 32 (10) ◽  
pp. 1150-1159
Author(s):  
Yuan Jia ◽  
Juxiang Yang ◽  
Xue Hu ◽  
Zhen Liu
Keyword(s):  
Silicon Dioxide ◽  
Tribological Properties ◽  
Sol Gel ◽  
Amino Groups ◽  
Silicon Dioxide Nanoparticles ◽  
Friction Process ◽  
Excessive Heat ◽  
Sol Gel Process ◽  
Volume Wear ◽  
Hybrid Silicon

To improve the tribological properties of bismaleimide (BMI) resin, silicon dioxide nanoparticles with imino and terminal functional amino groups were prepared through a sol–gel process to form a novel SiO2-NH2 hybrid. The as-prepared hybrid was then applied as a modifying agent for the BMI matrix to obtain SiO2-NH2/BMI composites. Compared to those of pure BMI resin, the volume wear rate and friction coefficient of the SiO2-NH2/BMI composites decreased significantly, while the wear mechanism changed from fatigue (BMI) to adhesive (SiO2-NH2/BMI) wear. This improvement in the tribological properties of the SiO2-NH2/BMI composites was attributed to the appropriate SiO2-NH2 added content, which endowed the BMI with excellent mechanical and thermal-resistant properties. Thus, the SiO2-NH2/BMI composites could resist the external load and excessive heat during the friction process.

Response of Swelling Behavior of Weak Branched Poly(ethylene imine)/Poly(acrylic acid) Polyelectrolyte Multilayers to Thermal Treatment

Langmuir ◽  
2016 ◽  
Vol 32 (24) ◽  
pp. 6020-6027 ◽  
Author(s):  
Yuanqing Gu ◽  
Emily K. Weinheimer ◽  
Xiang Ji ◽  
Clinton G. Wiener ◽  
Nicole S. Zacharia
Keyword(s):  
Thermal Treatment ◽  
Acrylic Acid ◽  
Swelling Behavior ◽  
Polyelectrolyte Multilayers ◽  
Ethylene Imine ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

Poly(ethylene glycol) as structure directing agent in sol–gel synthesis of amorphous silica

2014 ◽  
Vol 190 ◽  
pp. 146-151 ◽  
Author(s):  
O.V. Gorbunova ◽  
O.N. Baklanova ◽  
T.I. Gulyaeva ◽  
M.V. Trenikhin ◽  
V.A. Drozdov
Keyword(s):  
Ethylene Glycol ◽  
Amorphous Silica ◽  
Sol Gel ◽  
Poly Ethylene Glycol ◽  
Structure Directing Agent ◽  
Poly Ethylene ◽  
Sol Gel Synthesis

Sol-gel synthesis of silica–based mesoporous powders

2004 ◽  
Vol 848 ◽  
Author(s):  
Lidia Armelao ◽  
Gregorio Bottaro ◽  
Renzo Campostrini ◽  
Stefano Gialanella ◽  
Marco Ischia ◽  
...  
Keyword(s):  
Sol Gel ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Structure Directing Agent ◽  
Template Removal ◽  
Guest Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Sol Gel Synthesis

ABSTRACTMesoporous silica powders have been synthesized starting from aqueous solutions of Si(OCH2CH3)4 (TEOS) under acidic conditions, using non-ionic alkyl poly(ethylene oxide) oligomer (Brij76) as a structure-directing agent. Template removal was performed by thermal treatment in air as well as by ethanol extraction. The annealing process (400 - 600°C) resulted in more efficient elimination of the organic molecules, thus yielding hexagonal (p6mm) mesopor-ous materials with pore volume and specific surface area ranging between 0.58 – 0.41 cm3/g and 900 – 700 m2/g, respectively. The systems were characterized by X-Ray Diffraction (XRD), N2 BET adsorption, Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). Particular attention was focused on the evolution of the system mesostructural and porous features as a function of the template removal procedure. The obtained mesoporous networks are suitable as matrices for the development of nanocomposite systems in which the dispersion or the growth of various guest species (clusters, molecules…) can be addressed into the host mesopores.

scholarly journals Influence of the dispersion medium type in the sol-gel synthesis of silicon dioxide

2019 ◽  
Author(s):  
A. V. Blinov ◽  
A. A. Kravtsov ◽  
M. A. Jasnaja ◽  
A. A. Blinova ◽  
I. M. Shevchenko ◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Dispersion Medium ◽  
Sol Gel ◽  
Sol Gel Synthesis ◽  
Medium Type

scholarly journals A Combined Approach of Double Network Hydrogel and Nanocomposites Based on Hyaluronic Acid and Poly(ethylene glycol) Diacrylate Blend

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2454 ◽  
Author(s):  
Alfredo Ronca ◽  
Ugo D’Amora ◽  
Maria Raucci ◽  
Hai Lin ◽  
Yujiang Fan ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Ethylene Glycol ◽  
Sol Gel ◽  
Poly Ethylene Glycol ◽  
Double Network ◽  
Glycol Diacrylate ◽  
Physico Chemical ◽  
Hydrogel Matrix ◽  
Poly Ethylene ◽  
Sol Gel Synthesis

In this study, an innovative polymer blend, based on double network (DN) approach, has been developed by integrating a poly(ethylene glycol) diacrylate (PEGDA) network into a chemically modified hyaluronic acid sodium salt (HAs) hydrogel matrix. Here, the HAs was chemically functionalized with photocrosslinkable moieties by reacting with maleic anhydride (MAA) to obtain a maleated hyaluronic acid (MaHA). Furthermore, nanocomposite DN hydrogels were suitably prepared by physical blending of hydroxyapatite nanoparticles (HAp), obtained by sol-gel synthesis, within the hydrogel. Physico-chemical, thermal, morphological and mechanical analyses were performed. Results showed enhanced mechanical properties and a homogenous microstructure as highlighted by mechanical and morphological investigations. This suggests that nanocomposite DN hydrogels are promising candidates for biomedical applications.

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