scholarly journals A Novel Porous Sm2Ti2O7 Material Synthesized in Sol-gel Process Using Polyethylene Glycol 4000 as Template

2018 ◽  
Vol 24 (4) ◽  
Author(s):  
Wenjie ZHANG ◽  
Haolun LI ◽  
Ling DU
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Polyethylene Glycol 4000 ◽  
Sol Gel Process

Preparation of ZrC/SiC porous self-supporting monoliths via sol-gel process using polyethylene glycol as phase separation inducer

2018 ◽  
Vol 38 (14) ◽  
pp. 4806-4813 ◽  
Author(s):  
Fei Li ◽  
Xin-Gang Wang ◽  
Xiao Huang ◽  
Ji-Xuan Liu ◽  
Weichao Bao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polyethylene Glycol ◽  
Sol Gel ◽  
Sol Gel Process

Synthesis and Characterization of ZnO-SiO2/Epoxy Nanocomposite Coating by Sol-Gel Process

2012 ◽  
Vol 16 ◽  
pp. 1-7
Author(s):  
Nazanin Farhadyar ◽  
Mirabdullah Seyed Sadjadi
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Nanocomposite Coating ◽  
Contact Angles ◽  
Hybrid Coatings ◽  
Coating Film ◽  
Water Contact ◽  
Unit Form ◽  
Hybrid Solution ◽  
Sol Gel Process

In this paper, we report preparation of hydrophilic hybrid nanocomposite coatings on glass substrates using Zinc acetate solutions based on 3-glycidoxypropyltrimethoxysilane (GPTMS), epoxy resin, aromatic amine (HY850), polyethylene glycol (PEG) and surfactant (polyoxyethylene(4)laurylether) by the sol-gel process. Furthermore, the effects of PEG addition to the precursor solutions on the hydrophilic property and microstructure of the resultant coating film were studied. The hydrophilic behavior study of the synthesized hybrid was performed by adding different amounts of polyethylene glycol precursor to the hybrid solution. Experimental results show that, among different amounts of PEGs, the best results are obtained by addition of PEGs (400) to the hybrid solution which can decrease the water contact angles down to 16 and using surfactant down to 0, and increase the free surface energy. Coated glass exhibits a higher strength than uncoated glass. Attenuated total reflectance infrared spectroscopic (ATR-IR) technique was used to characterize the structure of the hybrid films. The chemical structure of obtained network affects morphology of the coating. The morphology of the hybrid coatings was examined by transmission electron microscopy (TEM). The hybrid systems have a unit form structure and the inorganic phases were in the nanosize scale,

scholarly journals Immobilization of Lipase CALB in Organically Modified Silica

2020 ◽  
Vol 11 (1) ◽  
pp. 7814-7825 ◽  
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Reaction Medium ◽  
Sol Gel Process ◽  
Yield Values ◽  
Activity Of Enzymes ◽  
Esterification Activity ◽  
Candida Antarctica B ◽  
The Mathematical Model ◽  
Commercial Lipase

In order to improve the activity of enzymes immobilized in silica, additives such as polyethylene glycol (PEG) can be introduced in the sol-gel process. This addition aims to protect the enzymes from denaturing effects by forming protection between the protein and the reaction medium. Thus, the aim of the work was to evaluate the effect of the use of the PEG additive in the process of immobilization of the commercial lipase of Candida antarctica B (CALB) in xerogel and aerogel obtained by the sol-gel technique. The mathematical model for the process was validated, and the optimum points determined were 0.09 g/ml of enzyme and 0.15 g/ml of polyethylene glycol additive for the xerogel and 0.12 g/ml of enzyme and 0.20 g/mL of polyethylene glycol additive for the aerogel. The maximum esterification activity and yield values were 544 U/g, 585%, and 266 U/g, 140% for xerogel and aerogel, respectively. Polyethylene glycol showed better performance in the esterification activity and stability as an additive when used in the xerogel, that is, when the process of obtaining the support uses the removal of the solvent only by evaporation. Regarding aerogel, a reduction in enzyme activity was observed, which may be due to the interaction of PEG with CO2 in the drying process.

Study on the Synthesis and Properties of Nano-ZnO

2011 ◽  
Vol 694 ◽  
pp. 324-327 ◽  
Author(s):  
Zong Rui Liu ◽  
Jie Hou ◽  
Li Mei Duan ◽  
Ling Xu
Keyword(s):  
Particle Size ◽  
Acetic Acid ◽  
Polyethylene Glycol ◽  
Sol Gel ◽  
Raw Material ◽  
N2 Adsorption ◽  
Nano Zno ◽  
Polyethylene Glycol 4000 ◽  
Dispersion Degree ◽  
Adsorption Desorption

Nano-ZnO was synthesized by sol-gel method using acetic acid zinc and ammonia as raw material and characterized by XRD, SEM, TEM and N2 adsorption-desorption measurements. In addition, the photoluminescence performance of nano-ZnO was analyzed through PL spectra. The particle size and dispersion degree of nano-ZnO could be controlled by adjusting the addition of surfactant polyethylene glycol-4000. The characterization results revealed that the crystallinity and dispersion degree of nano-ZnO were high and the surface area of nano-ZnO was large, when the amount of polyethylene glycol-4000 was 293.44 mg.

scholarly journals Effect of polyethylene glycol on surface coating of Ta2O5 onto titanium substrate in sol-gel technique

2021 ◽  
Vol 23 (1) ◽  
Author(s):  
Vamsi Krishna Dommeti, Sumit Pramanik, Sandipan Roy _ ◽  
_ _ ◽  
_ _
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Titanium Substrate ◽  
Porous Coating ◽  
Surgical Implants ◽  
Sol Gel Process ◽  
Growth Properties ◽  
Implant Coating ◽  
Layer Coating ◽  
Host Tissues

Purpose: Recently, titanium (Ti) and its alloys have been widely used in dental and surgical implants in the last few decades. However, there is a loosening effect over a long period usage. Therefore, the present study aimed to increase life of an implant by its surface modification. Methods: In present study, sol-gel process has been applied to create tantalum pentoxide (Ta2O5) layer coating on Ti-substrate. In this technique, polyethylene glycol (PEG) plays an important role to form uniform porous coating, which can have potential application in formation of strong bonding to the natural bone. Results: Microstructural, elemental, structural and binding energy results showed that the material with 100% PEG-enhanced sol-gel Ta2O5 with spin coating onto Ti substrate followed by an optimized sintering temperature (500 °C) has better porous structure than that of 5% PEG-enhanced sol-gel Ta2O5 coating, and would be suitable for tissue in-growth properties. Conclusions: Therefore, it was concluded that the present spin coated 100% PEG-enhanced Ta2O5 coating onto Ti, having the most suitable morphology with enhanced roughness, could be noteworthy for potential tissue in-growth and it could provide desired bonding at the interface of Ti-implant coating and host tissues in biomedical applications.

Synthesing and Studying the Structure of Nanoscale Copper (II) Oxide Stabilized by Polyethylene Glycol

2020 ◽  
pp. 56-70
Author(s):  
A.V. Blinov ◽  
А.А. Gvozdenko ◽  
М.А. Yasnaya ◽  
А.А. Blinova ◽  
A.A. Kravtsov ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Copper Oxide ◽  
Sol Gel ◽  
Interaction Model ◽  
Copper Oxide Nanoparticles ◽  
Correlation Spectroscopy ◽  
Composition Analysis ◽  
Oxide Nanoparticles ◽  
Optical Absorption Band ◽  
Sol Gel Process

We developed a method for synthesising polyethylene glycol-stabilized copper oxide nanoparticles via a sol-gel process, obtained samples and investigated their structure, morphology and properties. We used photon correlation spectroscopy to establish that the copper oxide nanoparticles feature a monomodal size distribution with the average hydrodynamic radius of a particle being approximately 50 nm irrespective of the stabiliser molar mass. We detected an optical absorption band at 290 nm in all samples. We established that copper oxide samples consist of aggregates formed out of spherical nanoparticles whose diameters lie in the range of 10 to 30 nm. Phase composition analysis of the copper oxide samples revealed that the samples consist of particles featuring a monoclinic structure. We simulated the process of polyethylene glycol interacting with the copper oxide. We show that the most energetically favourable interaction model includes bond formation between the neighbouring intramolecular etheric oxygen atoms and the copper atom

The crystallization of thin-film ceramics

1992 ◽  
Vol 50 (1) ◽  
pp. 338-339
Author(s):  
J.M. Schwartz ◽  
L.F. Francis ◽  
L.D. Schmidt ◽  
P.S. Schabes-Retchkiman
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Sol Gel ◽  
Processing Route ◽  
Small Areas ◽  
Ceramic Thin Films ◽  
Complex Shapes ◽  
Sol Gel Process ◽  
Ceramic Precursors ◽  
Crystalline Ceramic

Ceramic thin films and coatings are of interest for electrical, optical, magnetic and thermal barrier applications. Critical for improved properties in thin films is the development of specific microstructures during processing. To this end, the sol-gel method is advantageous as a versatile processing route. The sol-gel process involves depositing a solution containing metalorganic or colloidal ceramic precursors onto a substrate and heating the deposited layer to form a crystalline or non-crystalline ceramic coating. This route has several advantages, including the ability to create tailored microstructures and properties, to coat large or small areas, simple or complex shapes, and to more easily prepare multicomponent ceramics. Sol-gel derived coatings are amorphous in the as-deposited state and develop their crystalline structure and microstructure during heat-treatment. We are particularly interested in studying the amorphous to crystalline transformation, because many key features of the microstructure such as grain size and grain size distribution may be linked to this transformation.

Sign in / Sign up

Export Citation Format

Share Document