Study on the Fabrication of Superhydrophobic Microporous Polypropylene Flat Membrane Using In Situ Synthesis of Modified Fluorinated Silica Nano Particles

2013 ◽  
Vol 829 ◽  
pp. 371-375 ◽  
Author(s):  
Saba Raveshiyan ◽  
Reza Yegani ◽  
Behzad Pourabbas ◽  
Akram Tavakkoli
Keyword(s):  
Pure Water ◽  
Sol Gel ◽  
Nano Particles ◽  
Sem Images ◽  
Cross Sectional ◽  
Transfer Resistance ◽  
Thermally Induced ◽  
Coated Membranes ◽  
Membrane Contactors

The wettability is the most important features of membrane, when it works as contactors. Although the membrane contactors offer many advantages over conventional contacting equipments, additional mass transfer resistance is introduced when micropores are filled with aqueous absorbents. Therefore, fabrication of superhydrophobic membrane which prevents diffusion of aqueous absorbent into membrane pores is a highly challenging task. In this work, superhydrophobic polypropylene (PP) membrane was fabricated using in situ synthesis of silica nano particles via thermally induced phase separation (TIPS) method. Flat sheet fabricated PP membranes were casted with methanolic solution containing various ratios of perfluorooctyltriethoxysilane (PFOTES)/ tetraethylortosilicate (TEOS) and then sol-gel reaction between the mixed silances was completed. The contact angle of coated membrane was reached to 168 degree, when the percentage of PFOTES/TEOS was fixed at 50% (mol/mol). Interestingly, due to the microporous structure of PP membrane, the synthesized fluorinated silica nanoparticles were observed on the surface as well as in the cross-sectional area of the membrane. Field emission scanning electron microscopy (FE-SEM) images were confirmed this point. Chemical structure of the coated membranes with 50% PFOTES was compared with pure PP membrane using ATR-IR. In order to evaluate the operational performance, coated membranes were immersed in aqueous solutions of mono ethanol amine (MEA), di ethanol amine (DEA) and pure water. In comparison with pure PP membrane, obtained results showed that the wettability of coated membranes was considerably decreased.

Synthesis, Characterization and Properties of PANI/(La-Nd Doped BaFe12O19) Composites

2017 ◽  
Vol 727 ◽  
pp. 327-334
Author(s):  
Yan Wang ◽  
Jun Wang ◽  
Xiao Fei Zhang ◽  
Ya Qing Liu
Keyword(s):  
Sol Gel ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Structure Morphology ◽  
Xrd Patterns ◽  
Hexagonal Platelet ◽  
Peak Value ◽  
Properties Of Composites

La-Nd co-doped barium hexaferrites, Ba0.7(LamNdn)0.3Fe12O19 (D-BaM), were successfully prepared by sol-gel method. PANI / D-BaM composites were synthesized by in-situ polymerization in solution. The structure, morphology and properties of samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), four-probe conductivity tester and vector network analyzer. The XRD patterns showed that the crystal structure of all the samples exist as M-type phases. The SEM images revealed that the particles presented a hexagonal platelet-like morphology. The magnetic properties could be improved by substitutions of La and Nd ions. The saturation magnetization (Ms) and coercive force (Hc) increased with the change of La / Nd ratio to the maximum at La / Nd = 3:1. The doped particles have also been embedded in conductive PANI to prepare electromagnetic materials, and the conductivity kept on the order of 10-2. The microwave absorbing properties of composites at 30 MHz-6 GHz improved obviously, the peak value of reflection loss could reach-7.5 dB.

scholarly journals Polypropylene Nanocomposites Obtained byIn SituPolymerization Using Metallocene Catalyst: Influence of the Nanoparticles on the Final Polymer Morphology

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Paula Zapata ◽  
Raúl Quijada
Keyword(s):  
Catalytic System ◽  
Sol Gel ◽  
Metallocene Catalyst ◽  
Particle Morphology ◽  
Polymer Particle ◽  
Silica Nanospheres ◽  
Sem Images ◽  
Transmission Electron ◽  
Polypropylene Nanocomposites

Polypropylene nanocomposites containing silica nanospheres based on the sol-gel methods were produced viain situpolymerization using a rac-Et(Ind)2ZrCl2/methylaluminoxane (MAO) system. Two different routes were used depending on the interaction between the silica nanoparticles with the catalytic system. In route 1 the nanoparticles were added together with the catalytic system (rac-Et(Ind)2ZrCl2)/(MAO) directly into the reactor, and in route 2 the metallocene rac-Et(Ind)2ZrCl2was supported on silica nanospheres pretreated with (MAO). SEM images show that when the nanospheres were added by both routes, they were replicated in the final polymer particle morphology; this phenomenon was more pronounced for PP obtained by route 2. The polypropylene (PP) nanocomposites obtained by both routes had a slightly higher percent crystallinities and crystallinity temperatures than pure PP. Transmission electron microscopy (TEM) images show that the nanospheres were well dispersed into the polypropylene matrix, particularly in the nanocomposites obtained by the support system (route 2).

scholarly journals A Novel Fabrication of Spherical Fe50ni50 Alloy Powders via in-Situ De-Wetting of Liquid Solid Interface

Crystals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 325
Author(s):  
Song ◽  
Lei ◽  
Zhong
Keyword(s):  
Spherical Shape ◽  
Soft Magnetic Property ◽  
Spherical Particles ◽  
Soft Magnetic ◽  
Sem Images ◽  
Cross Sectional ◽  
Alloy Particles ◽  
Ni Alloy ◽  
Alumina Particles

: Spherical Fe50Ni50 alloy powders were fabricated via a novel route based on in-situ interface de-wetting between liquid Fe-Ni alloy and alumina. The obtained Fe50Ni50 alloy particles exhibit very good spherical shape according to SEM images. Furthermore, the cross-sectional SEM images show that there are no pores and bulk inclusions in the internal region of the spherical particles. The XRD results show a trace amount of the impurity alumina phase appearing in taenite phase. The size distribution agreed well with the SEM observation confirms that the alumina powders successfully segregated pre-alloy powders. As an incidental benefit, the surface alumina particles were treated as the electrical insulation coatings. The magnetic character shows that spherical Fe50Ni50 powders exhibit a good soft magnetic property even though with a slightly decreasing of saturation magnetization due to non-magnetic coatings. Our strategies provide a method to in-situ fabricate insulation coated Fe-Ni spherical alloy powders as magnetic powder core.

Growth of Ceria-Zirconia Electrolyte Nanostructures with High Interface Density by Using Sol-gel/GLAD Combination

2004 ◽  
Vol 835 ◽  
Author(s):  
Laxmikant Saraf ◽  
D. W. Matson ◽  
J. S. Young ◽  
C. M. Wang ◽  
S. Thevuthasan
Keyword(s):  
High Efficiency ◽  
Sol Gel ◽  
Mapping Technique ◽  
Cross Sectional ◽  
X Ray ◽  
Glancing Angle ◽  
Zirconia Electrolyte ◽  
Glad Technique ◽  
Cell Electrolytes

ABSTRACTWe report a process for the successful incorporation of ceria in to yttria-stabilized zirconia (YSZ) columnar nanostructures grown by glancing angle deposition (GLAD) technique, resulting in high interface density columnar nanostructures. The incorporation of ceria into YSZ columns is confirmed by scanning electron microscopy (SEM) in a cross sectional geometry with in-situ analysis of elemental x-ray mapping technique and energy dispersive x-ray analysis (EDX). Controlled engineering of such nanostructures is potentially important in the future development of high efficiency solid oxide fuel cell electrolytes. The challenges and advantages of this process are discussed.

Utilization of Smartphone Light Sensors as Light Transmission Analyzer During the Obtaining of Polymeric Phase Inversion Membranes

2020 ◽  
Vol 43 (3) ◽  
pp. 5-9
Author(s):  
Ștefan PINTILIE ◽  
◽  
Geanina Laurenția PINTILIE ◽  
Ștefan BALTĂ ◽  
◽  
...  
Keyword(s):  
Phase Inversion ◽  
Light Transmission ◽  
Pure Water ◽  
Light Transmittance ◽  
Membrane Properties ◽  
Water And Wastewater Treatment ◽  
Sem Images ◽  
Cross Sectional ◽  
Polysulfone Membrane ◽  
Best Available Technologies

Smartphone sensors are gaining research interest due to continuous sensor upgrades, leading to more precise readings of these sensors. For this study, the light sensor of a smartphone was used in determining light transmittance during the phase inversion process of ultrafiltration polysulfone - membrane manufacturing. Membrane separation is one of the best available technologies when it comes to water and wastewater treatment. The purpose of this study was to correlate light transmit tance, at certain demixing steps during phase inversion, with membrane porosity, pure water flux and cross - sectional SEM images. Results show close relation between light transmittance and the mentioned membrane properties.

Preparation and Characterization of Polyimide-Silica Nanocomposites by Sol-Gel Process

2006 ◽  
Vol 111 ◽  
pp. 111-114 ◽  
Author(s):  
Yao Yi Cheng ◽  
Kun Chang Chuang
Keyword(s):  
Sol Gel ◽  
Amic Acid ◽  
Silica Content ◽  
Nano Particles ◽  
Hybrid Thin Film ◽  
Silica Nanocomposites ◽  
Sol Gel Process ◽  
Tetracarboxylic Dianhydride

Polyimide (PI)-based nanocomposites were prepared by the in-situ generation of organic silica nano-particles through a sol-gel process, combined with spin coating and multi-step curing process. In this study, silica nano-particles were introduced into the PI matrix to promote its thermal properties. Nanometer-scale composites were successfully obtained from poly(amic acid) (PAA) mixture loaded with silica. 3,3’,4,4’- Biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA) were employed to synthesize the PAA precursor. The hybrid thin film was prepared from aminoalkoxysilane-capped PAA and tetraethoxysilane (TEOS). In this work, we investigated the effect of coupling agent, 3-aminopropyltriethoxysilane (APrTEOS). The TGA results indicate that the thermal stability of the nanocomposites can be enhanced as silica content increases. Without the incorporation of APrTEOS, less improvement can be achieved.

scholarly journals In situ deposition of NiO nano particles on cotton fabric using sol–gel method- photocatalytic activation properties

2021 ◽  
Vol 12 ◽  
pp. 1-14
Author(s):  
Sadaf Pooyandeh ◽  
Sheila Shahidi ◽  
Ana Khajehnezhad ◽  
Rattanaphol Mongkholrattanasit
Keyword(s):  
Cotton Fabric ◽  
Sol Gel ◽  
Nano Particles ◽  
Gel Method ◽  
Sol Gel Method ◽  
In Situ Deposition

Study on Poly(ether imide)/Amino-Modified Sillica Hybrid Membranes

2014 ◽  
Vol 789 ◽  
pp. 218-223
Author(s):  
Ying Chen ◽  
Jun Fen Sun
Keyword(s):  
Mechanical Properties ◽  
Pure Water ◽  
Sol Gel ◽  
Morphological Structure ◽  
Hybrid Membranes ◽  
Water Contact ◽  
Sol Gel Process ◽  
And Performance ◽  
Field Emission Electron Microscopy

Poly (ether imide) (PEI) membrane with many good properties, such as chemical resistance, biocompatibility, good thermal, and mechanical properties, has been widely used in filtration and biomedical applications. SiO2particles containing amine groups can be a good enzyme immobilization carrier. Organic-inorganic hybrids of poly (ether imide) and amino-modified SiO2were in situ prepared via sol-gel process in the presence of tetraethylortho silicate (TEOS) in a mixed solvent of N, N-Dimethylacetamide/1-Methyl-2-pyrrolidone (DMAc/NMP). The effects of casting solution composition on the membrane morphological structure and performance were investigated. The dispersion of the inorganic and organic phase in the nanoscale was possible with addition of (3-aminopropyl) triethoxysilane (APTES) as shown by field emission electron microscopy. Membranes with different ratio of APTES/TEOS have quite different properties. Mechanical properties evaluation such as rupture elongation ration and tensile strength tests of the hybrid membranes were carried out. Fourier transform infrared spectroscopy (FTIR), pure water fluxes and water contact angle of the hybrid membranes were also characterized. The results show that poly (ether imide)/amino-modified SiO2hybrid membranes have high static adsorption capacity for lysozyme (Lys). Moreover, mechanical properties of the hybrid membranes greatly improve compared to pure PEI membranes.

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