scholarly journals Preparation and Optical Application of SiO2-TiO2 Composite Hardening Coatings with Controllable Refractive Index by Synchronous Polymerization

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 129
Author(s):  
Weiping Du ◽  
Shuting Cai ◽  
Yang Zhang ◽  
Huifang Chen
Keyword(s):  
Refractive Index ◽  
Titanium Isopropoxide ◽  
Hard Coatings ◽  
Reaction Conditions ◽  
Optical Lens ◽  
Force Microscopy ◽  
Hardness Tester ◽  
Hardening Coatings ◽  
Atomic Force ◽  
Particle Size Analyzer

The homogeneous SiO2-TiO2 composite sols were prepared by organic-inorganic synchronous polymerization with titanium isopropoxide and tetrabutyl silicate as precursor. The organic-inorganic composite hard coating with Si-O-Ti as the framework was prepared by adding compound crosslinkers (up-401) and 3-Methacryloxypropyltrimethoxysilane (KH-560). The structure of the coating and the hardened film were characterized by infrared spectrum, scanning electron microscopy, atomic force microscopy, particle size analyzer and thermogravimetry. The refractive index, transmittance and hardness of the hardened film were measured by ellipsometry, UV-Vis spectrophotometer and hardness tester. By adjusting the ratio of Si/Ti and optimizing the reaction conditions, the hardness of the hardened film could reach 6H, and the refractive index could be adjusted from 1.55 to 1.76. At the same time, the application of hard coatings on the surface of optical lens were studied.

scholarly journals Топография поверхности и оптические характеристики тонких пленок AlN на подложке GaAs (100), полученных методом реактивного ионно-плазменного распыления

2019 ◽  
Vol 45 (5) ◽  
pp. 38
Author(s):  
Е.В. Фомин ◽  
А.Д. Бондарев ◽  
A.I. Rumyantseva ◽  
T. Maurer ◽  
Н.А. Пихтин ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Refractive Index ◽  
Surface Structure ◽  
Optical Characteristics ◽  
Process Conditions ◽  
Antireflection Coatings ◽  
Force Microscopy ◽  
Plasma Sputtering ◽  
Atomic Force ◽  
Ion Plasma

AbstractA study of the surface topography and optical characteristics of thin AlN films used as passivating and antireflection coatings deposited on n -GaAs (100) substrates by reactive ion-plasma sputtering is reported. It was found that the process conditions affect the structure and the optical characteristics of the films, which makes it possible to obtain coatings with prescribed parameters. An analysis of the results furnished by ellipsometry and atomic-force microscopy of the surface shows that the refractive index of the films is correlated with the surface structure.

scholarly journals Aliphatic Diacidic Long-Chain C16 Polyesters from 10,16-Dihydroxyhexadecanoic Acid Obtained from Tomato Residual Wastes

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1524 ◽  
Author(s):  
Arrieta-Baez ◽  
Hernández Ortíz ◽  
Terán ◽  
Torres ◽  
Gómez-Patiño
Keyword(s):  
Mass Spectrometry ◽  
Enzymatic Reaction ◽  
Reaction Conditions ◽  
1H And 13C Nmr ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
One Step ◽  
Long Chain ◽  
Polyester Film

10,16-dihydroxyhexadecanoic acid obtained from agroresidual tomato waste, was oxidized to produce 7-oxohexadecanedioic acid in good yield (>70%) and purified without oxidation side products in one step. Polycondensation with 1,8-octanediol, yielded the polyester (poly(ω-carboxyl PA-co-OD)) with Mw = 2155.15 and Mn = 1637.27. The best enzymatic reaction conditions to get the polyester were using lipase CAL-B (%-by-wt relative to monomer) in toluene as a solvent for 1 h at 60 °C. The poly(ω-carboxyl PA-co-OD) was characterized by 1H- and 13C-NMR, mass spectrometry (MALDI-TOF) and the polyester film formed with a Langmuir-Blodgett Trough was analyzed by means of spectroscopic ellipsometry and atomic force microscopy.

Investigation of Structural and Mechanical Properties of Laser Deposited Microlaminate Hard Coatings

2001 ◽  
Vol 697 ◽  
Author(s):  
Manoj Radder ◽  
A.K. Sikder ◽  
Ashok Kumar
Keyword(s):  
Mechanical Properties ◽  
Boron Carbide ◽  
Composite Coatings ◽  
Bottom Layer ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Si Substrates ◽  
Atomic Force ◽  
Substrate Temperatures

Nitride and carbide are superhard material with a high potential for applications in different fields. A new group of coatings are the multilayered/microlaminate coatings, which have shown very interesting properties. Single and microlaminate films were coated on Silicon (Si) substrates using pulsed laser deposition (PLD) technique. Films were deposited at different substrate temperatures in order to study the microstructure evolution and their effect on the mechanical properties of these microlaminate films. Structure of the films was characterized by x-ray diffraction (XRD) technique. Surface morphology and roughness of the films were investigated using atomic force microscopy (AFM). Hardness and modulus of the films were investigated using nanoindentation technique. It has been demonstrated that using boron carbide as a bottom layer increases the hardness and Young's modulus values of carbide composite coatings. Microlaminates of boron carbide/titanium carbides have shown higher hardness and modulus as compared to the microlaminates of nitride coatings.

scholarly journals Effects of Xanthate on Flotation Kinetics of Chalcopyrite and Talc

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 369 ◽  
Author(s):  
Limei Bai ◽  
Jie Liu ◽  
Yuexin Han ◽  
Kai Jiang ◽  
Wenqing Zhao
Keyword(s):  
Physical Adsorption ◽  
Particle Morphology ◽  
Flotation Kinetics ◽  
Flotation Rate ◽  
Force Microscopy ◽  
Atomic Force ◽  
Angle Measuring ◽  
Particle Size Analyzer ◽  
Underlying Causes ◽  
Kinetics Of

This paper investigated the effects of using or not using potassium butyl xanthate (PBX) as a collector on the flotation kinetics of talc and chalcopyrite. By means of atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR), a contact angle measuring instrument and particle size analyzer, the underlying causes behind the flotation rate changes of talc and chalcopyrite are analyzed. Experimental results showed that in collectorless flotation, the law of change in the flotation rate constant (k) of the two minerals over time is independent of pH, and k values of chalcopyrite are much smaller than those of talc. In the presence of PBX, the flotation speed of chalcopyrite greatly increases, and the k values of chalcopyrite are far larger than those of talc. This is mainly because the amount of xanthate adsorbed on the surface of chalcopyrite is large and the adsorption is in the form of chemisorption, while the adsorption of xanthate on the talcum surface is in very small amounts and in the form of physical adsorption. Simulation results indicated that the collectorless flotation of chalcopyrite conform to the classical first-order kinetics model and the Kelsall model, whereas that of talc only conform to the latter, which is due to the layered structure of talc. In the presence of the collector, talc flotation conforms to the two model, because talc has a higher floatability and particle morphology has less influence on the flotation rate.

scholarly journals Preparation of (Pb,Ba)TiO3 powders and highly oriented thin films by a sol-gel process

2004 ◽  
Vol 19 (5) ◽  
pp. 1492-1498 ◽  
Author(s):  
Stacey W. Boland ◽  
Suresh C. Pillai ◽  
Wein-Duo Yang ◽  
Sossina M. Haile
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Chelating Agent ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Molar Ratios ◽  
Atomic Force ◽  
Sol Gel Process

Solid solution Pb1-xBaxTiO3, with particular emphasis on Pb0.5Ba0.5TiO3, was prepared using a sol-gel process incorporating lead acetate trihydrate, barium acetate, and titanium isopropoxide as precursors, acetylacetone (2,4 pentanedione) as a chelating agent, and ethylene glycol as a solvent. The synthesis procedure was optimized by systematically varying acetylacetone: Ti and H2O:Ti molar ratios and calcination temperature. The resulting effects on sol and powder properties were studied using thermogravimetric analysis/differential scanning calorimetry, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis, and x-ray diffraction (XRD). Crystallization of the perovskite structure occurred at a temperature as low as 450 °C. Thin films were prepared by spin coating on (100) MgO. Pyrolysis temperature and heating rate were varied, and the resultant film properties investigated using field-emission scanning electron microscopy, atomic force microscopy, and XRD. Under optimized conditions, highly oriented films were obtained at a crystallization temperature of 600 °C.

Influence of Nanostructured Fibers on Properties of Building Composites

2012 ◽  
Vol 249-250 ◽  
pp. 958-961
Author(s):  
Natalya Valentinovna Makarova ◽  
Vasiliy Petrovich Pogodaev ◽  
Anton Vasilyevich Pogodaev ◽  
Andrey Vladimirovich Kozin ◽  
Aleksey Sergeevich Lipovoy
Keyword(s):  
Plain Concrete ◽  
Concrete Surface ◽  
Cement Composites ◽  
High Modulus ◽  
Micro Hardness ◽  
Mineral Fibers ◽  
Force Microscopy ◽  
Hardness Tester ◽  
Atomic Force ◽  
Strength And Deformation

Currently, interest in nanotechnology concept for cement composites is steadily growing. Results of investigations of the concrete surface, reinforced with nanostructured mineral fibers by using atomic force microscopy (AFM) and dynamic ultra-micro hardness tester (DUMHT) of the specific areas of surface are presented. For comparison plain concrete and concrete with addition of single mineral fibers investigated as well. The analysis of the obtained data has shown that as a result of the directed microdisperse structurization provided by nanoinitiators on a surface of fibers, increase strength and deformation characteristics of a material. The main objective of this paper is to research the mechanisms of pattern formation surface of the concrete contained the High-modulus basalt microfiber (HMBMF) as a solid carrier for nanoparticles.

Comparison between the optical and surface properties of TiO2 and Ag/TiO2 thin films prepared by sol-gel process

2011 ◽  
Vol 1352 ◽  
Author(s):  
Marcelo M. Viana ◽  
Nelcy D. S. Mohallem
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Refraction Index ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Sol Gel Process

ABSTRACTColloidal precursor solutions, obtained from a mixture of titanium isopropoxide, isopropyl alcohol and silver nitrate, were used to fabricate amorphous TiO2 and Ag/TiO2 thin films by sol-gel process. The films were deposited on borosilicate substrates, which were heated at 400 °C for 30 minutes and cooled rapidly to the formation of amorphous coatings. The films were investigated by X-ray diffraction, scanning electron microscopy, atomic force microscopy and UV-vis spectroscopy. The thickness, roughness, refraction index, and particle size of the TiO2 and Ag/TiO2 films were determined and compared. Finally, hydrophobic-hydrophilic property was evaluated to the thin films produced.

scholarly journals Synthesis and Characterization of Titanium Dioxide Nanoparticles under Different pH Conditions

2018 ◽  
Vol 25 (1) ◽  
pp. 40-50
Author(s):  
Basma Abbas Abdulmajeed ◽  
Sameera Hamadullah ◽  
Fadhil Abed Allawi
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Ammonium Hydroxide ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Size Growth ◽  
Ph Level

Ethanol as a solvent, a precursor of titanium isopropoxide and a stabilizer of either hydrochloric acid or ammonium hydroxide was used to prepare a titanium dioxide aqueous solution. The aqueous solutions with different values of pH and the morphology of the resultant reaction of the nanoparticles of titanium dioxide were investigated. The X-ray diffraction showed that at low temperatures and with acidic solutions, rutile structures are more favorable to grow on titanium dioxide synthesized, while at low and average temperatures and with base solutions, anatase phase is more pronounced. The crystalline form and the re-confirmation of the crystallite size growth were observed by the scanning electron microscopy. The atomic force microscopy was used to confirm the relation between the roughness and thickness with the pH level.  

Sign in / Sign up

Export Citation Format

Share Document