scholarly journals PENGARUH TIO2 TERHADAP HASIL PROSES PENYEMPURNAAN TAHAN API KAIN KAPAS DENGAN MENGGUNAKAN THPC-UREA

Texere ◽  
2021 ◽  
Vol 17 (2) ◽  
Author(s):  
Mizan Adha ◽  
Khairul Umam ◽  
Wulan Safrihatini
Keyword(s):  
Sol Gel ◽  
Anatase Tio2 ◽  
Tio2 Anatase ◽  
Phosphonium Chloride

Kapas memiliki sifat mudah terbakar dan bara apinya meneruskan pembakaran dengan nilai LOI 18,4%. Untuk mangatasi keterbatasan tersebut, maka dilakukanlah proses penyempurnaan tahan api menggunakan THPC dan urea. Adanya TiO2 diperkirakan mampu untuk meningkatkan sifat penyempurnaan tahan api. TiO2 yang digunakan berupa hasil sintesis menggunakan metode sol-gel. Proses sintesis dilakukan dengan cara pencampuran antara TiCl4 dengan etanol, kemudian digelatinisasi selama 24 jam dan dilakukan proses kalsinasi pada suhu 550oC selama 2 jam. Percobaan ini dilakukan dengan menggunakan TiO2 hasil sintesis sebagai zat tahan api pada penyempurnaan tahan api kain kapas dengan memvariasikan konsentrasi TiO2 yaitu 0, 3, 6, dan 9 %. TiO2 dikombinasikan dengan tetrakis hydroxyl phosphonium chloride (THPC)-urea sebagai zat tahan api utama. Selanjutnya dilakukan pengujian berupa XRD, FTIR , pengujian tahan api cara vertikal dan pengujian kekuatan tarik kain. Hasil penelitian menunjukkan bahwa pencampuran TiCl4 dengan etanol berhasil membentuk TiO2 anatase, TiO2 hasil sintesis berhasil menempel pada kain kapas hasil penyempurnaan tahan api. Efek dari penggunaan kombinasi zat tahan api THPC-Urea-TiO2 dapat mengakibatkan penurunan kekuatan tarik pada kain kapas. Kain yang diberikan TiO2 memberikan waktu nyala yang lebih lama dan panjang arang yang lebih pendek jika dibandingkan dengan kapas tanpa penyempurnaan tahan api.

scholarly journals Eco-Friendly Colloidal Aqueous Sol-Gel Process for TiO2 Synthesis: The Peptization Method to Obtain Crystalline and Photoactive Materials at Low Temperature

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 768
Author(s):  
Julien G. Mahy ◽  
Louise Lejeune ◽  
Tommy Haynes ◽  
Stéphanie D. Lambert ◽  
Raphael Henrique Marques Marcilli ◽  
...  
Keyword(s):  
Organic Pollutant ◽  
Sol Gel ◽  
Synthesis Method ◽  
Specific Treatment ◽  
High Specific Surface Area ◽  
Crystalline Phases ◽  
Tio2 Photocatalysts ◽  
Tio2 Anatase ◽  
Synthesis Parameters ◽  
Calcination Step

This work reviews an eco-friendly process for producing TiO2 via colloidal aqueous sol–gel synthesis, resulting in crystalline materials without a calcination step. Three types of colloidal aqueous TiO2 are reviewed: the as-synthesized type obtained directly after synthesis, without any specific treatment; the calcined, obtained after a subsequent calcination step; and the hydrothermal, obtained after a specific autoclave treatment. This eco-friendly process is based on the hydrolysis of a Ti precursor in excess of water, followed by the peptization of the precipitated TiO2. Compared to classical TiO2 synthesis, this method results in crystalline TiO2 nanoparticles without any thermal treatment and uses only small amounts of organic chemicals. Depending on the synthesis parameters, the three crystalline phases of TiO2 (anatase, brookite, and rutile) can be obtained. The morphology of the nanoparticles can also be tailored by the synthesis parameters. The most important parameter is the peptizing agent. Indeed, depending on its acidic or basic character and also on its amount, it can modulate the crystallinity and morphology of TiO2. Colloidal aqueous TiO2 photocatalysts are mainly being used in various photocatalytic reactions for organic pollutant degradation. The as-synthesized materials seem to have equivalent photocatalytic efficiency to the photocatalysts post-treated with thermal treatments and the commercial Evonik Aeroxide P25, which is produced by a high-temperature process. Indeed, as-prepared, the TiO2 photocatalysts present a high specific surface area and crystalline phases. Emerging applications are also referenced, such as elaborating catalysts for fuel cells, nanocomposite drug delivery systems, or the inkjet printing of microstructures. Only a few works have explored these new properties, giving a lot of potential avenues for studying this eco-friendly TiO2 synthesis method for innovative implementations.

scholarly journals Surface Chemistry, Crystal Structure, Size and Topography Role in the Albumin Adsorption Process on TiO2 Anatase Crystallographic Faces and Its 3D-Nanocrystal: A Molecular Dynamics Study

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 420
Author(s):  
Giuseppina Raffaini
Keyword(s):  
Crystal Structure ◽  
Molecular Dynamics ◽  
Surface Chemistry ◽  
Protein Adsorption ◽  
Adsorption Process ◽  
Sol Gel ◽  
Interaction Strength ◽  
Theoretical Work ◽  
Blood Protein ◽  
Tio2 Anatase

TiO2 is widely used in biomaterial implants. The topography, chemical and structural properties of titania surfaces are an important aspect to study. The size of TiO2 nanoparticles synthetized by sol–gel method can influence the responses in the biological environment, and by using appropriate heat treatments different contents of different polymorphs can be formed. Protein adsorption is a crucial step for the biological responses, involving, in particular, albumin, the most abundant blood protein. In this theoretical work, using molecular mechanics and molecular dynamics methods, the adsorption process of an albumin subdomain is reported both onto specific different crystallographic faces of TiO2 anatase and also on its ideal three-dimensional nanosized crystal, using the simulation protocol proposed in my previous theoretical studies about the adsorption process on hydrophobic ordered graphene-like or hydrophilic amorphous polymeric surfaces. The different surface chemistry of anatase crystalline faces and the nanocrystal topography influence the adsorption process, in particular the interaction strength and protein fragment conformation, then its biological activity. This theoretical study can be a useful tool to better understand how the surface chemistry, crystal structure, size and topography play a key role in protein adsorption process onto anatase surface so widely used as biomaterial.

scholarly journals Nanocrystalline composites in TiO2 and SnO2 system for ammonia resistance sensors

2018 ◽  
Vol 12 (3) ◽  
pp. 240-247
Author(s):  
Anna Szczygielska ◽  
Zbigniew Pędzich ◽  
Wojciech Maziarz
Keyword(s):  
Phase Composition ◽  
Sol Gel ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Medium Size ◽  
X Ray Diffraction ◽  
Nanocrystalline Tio2 ◽  
Tio2 Anatase ◽  
Transmission Electron ◽  
Sorption Method

This work describes the production of nanocrystalline TiO2 and SnO2 oxides, as well as their nanocomposites (containing 26.9, 58.7 and 79.0wt.% of SnO2) with two-stage sol-gel method combined with high temperature treatment. The phase composition and medium size crystallites were determined using X-ray diffraction analysis (XRD) and revealed that the nanocomposites crystallize in tetragonal structures of TiO2 - anatase and SnO2 - cassiterite. Specific surface area of the nanopowders, measured using sorption method (BET), changed from 42.1 to 160.8m2/g. The morphology of the nanopowders was observed using transmission electron microscope (TEM). As indicated by TEM images, the manufactured nanopowders were well crystallized and consisted of small, spherical grains. The obtained nanopowders were also tested for NH3 gas detection application. The presented method of nanopowders synthesis enables to obtain nanocrystalline TiO2 and SnO2 oxides, as well as composites from TiO2-SnO2 of known and controlled chemical and phase composition. It also enables to obtain composites used for gas sensors. The sensor made of composite containing 58.7wt.% of SnO2 exhibited the best NH3 sensing features.

Peptization Process in the Sol-Gel Preparation of Porous Anatase (TiO2)

1995 ◽  
Vol 7 (10) ◽  
pp. 1772-1778 ◽  
Author(s):  
Brian L. Bischoff ◽  
Marc A. Anderson
Keyword(s):  
Sol Gel ◽  
Anatase Tio2 ◽  
Gel Preparation

scholarly journals Effectiveness of photodecomposition of rhodamine B and malachite green upon coupled tricomponent TiO2(Anatase-Rutile)/ZnO nanocomposite

2013 ◽  
Vol 6 (2) ◽  
pp. 245-255 ◽  
Author(s):  
Dongfang Zhang
Keyword(s):  
Malachite Green ◽  
Rhodamine B ◽  
Active Sites ◽  
Diffuse Reflectance Spectroscopy ◽  
Organic Dyes ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Photocatalytic Decomposition ◽  
Photoluminescence Intensity ◽  
Tio2 Anatase

Abstract In this study, mixed phase ZnO-TiO2 nanocomposite consisting of hexagonal ZnO and anatase/rutile TiO2 has been synthesized via sol-gel process.The physical and photochemical properties of samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), photoluminscience spectra (PL) and and photocurrent action spectra techniques. In the case of minerlization of rhodamine B (RhB) and malachite green (MG) dyes, the coupled ZnO-TiO2 nanocomposite with the suitable band structure and the lowest photoluminescence intensity showed the best photodecolorization activity. Synergistic effects between the two oxides for photocatalytic decomposition of RhB and MG are proposed to elucidate the decolorization mechanism. The lifetime of electrons and holes was prolonged in the ZnO-anatase/rutile multiple-component system, which can enhance the light harvest and the ability of generating photo-induced electron-hole pairs of active sites, and the favorable electron-transfer properties in the coupled ZnO-TiO2 nanocomposite. Therefore, the as-prepared ZnO-TiO2 nanocomposite showed an excellent efficiency towards the removal of aqueous organic dyes and it is of certain significance for environmental photocatalysis.

Elaboration and characterization of nano-crystalline layers of transparent titanium dioxide (Anatase-TiO2) deposited by a sol-gel (spin coating) process

2020 ◽  
Vol 19 ◽  
pp. 100482 ◽  
Author(s):  
Radhia Messemeche ◽  
Hanane Saidi ◽  
Abdallah Attaf ◽  
Youcef Benkhetta ◽  
Saadia Chala ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Spin Coating ◽  
Sol Gel ◽  
Anatase Tio2 ◽  
Coating Process ◽  
Spin Coating Process ◽  
Nano Crystalline

Development and Characterization of Nano-TiO2/HA Composite Bioceramic Coating on Titanium Surface

2007 ◽  
Vol 336-338 ◽  
pp. 1802-1805 ◽  
Author(s):  
Gang He ◽  
Xia Deng ◽  
Yuan Kun Cen ◽  
Xiao Yu Li ◽  
En Luo ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Sol Gel ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Commercially Pure Titanium ◽  
Nano Tio2 ◽  
Tio2 Anatase ◽  
Crystallization Surface

This research is aimed at the development and characterization of a novel bioceramic coating on the surface of pure titanium. Nano-TiO2/HA composite bioceramic coating was designed and developed on the surfaces of pure titanium discs by sol-gel route. The TiO2 anatase bioceramic coating was employed as the inner layer, which could adhere tightly to the titanium substrate. The porous HA bioceramic coating was employed as the outer layer, which has higher solubility and better short term bioactivity. Conventional HA coatings and commercially pure titanium (cpTi) were taken as control. XRD and SEM were employed to characterize the crystallization, surface morphology and thickness of the coatings. The bioactivities of the coatings were evaluated by the in vitro osteoblasts culture. Results show the nano-TiO2/HA composite bioceramic coating has good crystallization and homogeneous, nano-scale surface morphology. And it adheres tightly to the substrate. The in vitro osteoblasts culture exhibits satisfactory bioactivity.

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