scholarly journals The Effect of Film Thickness and Content on Film Formation from PS/ Nanocomposites Prepared by Dip-Coating Method

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
M. Selin Sunay ◽  
Onder Pekcan ◽  
Saziye Ugur
Keyword(s):  
Film Thickness ◽  
Elevated Temperatures ◽  
Film Formation ◽  
Fluorescence Emission ◽  
Dip Coating ◽  
Atomic Force ◽  
Annealing Step ◽  
Coating Method ◽  
Fluorescence Emission Intensity ◽  
Dip Coating Method

Steady-state fluorescence (SSF) technique in conjunction with UV-visible (UVV) technique and atomic force microscope (AFM) was used for studying film formation from TiO2covered nanosized polystyrene (PS) latex particles (320 nm). The effects of film thickness and TiO2content on the film formation and structure properties of PS/TiO2composites were studied. For this purpose, two different sets of PS films with thicknesses of 5 and 20 μm were prepared from pyrene-(P-) labeled PS particles and covered with various layers of TiO2using dip-coating method. These films were then annealed at elevated temperatures above glass transition temperature () of PS in the range of 100–280°C. Fluorescence emission intensity, from P and transmitted light intensity, were measured after each annealing step to monitor the stages of film formation. The results showed that film formation from PS latexes occurs on the top surface of PS/TiO2composites and thus developed independent of TiO2content for both film sets. But the surface morphology of the films was found to vary with both TiO2content and film thickness. After removal of PS, thin films provide a quite ordered porous structure while thick films showed nonporous structure.

Formation of Lubricant “Sierra” at Boundary Between PFPE Solution Dipped and Un-Dipped Zones Over DLC Coated Magnetic Disks

2002 ◽  
Author(s):  
Yasunaga Mitsuya ◽  
Keiko Goto ◽  
Yoshihiro Hayashi
Keyword(s):  
Film Thickness ◽  
Thickness Distribution ◽  
Dip Coating ◽  
Boundary Line ◽  
Boundary Area ◽  
Magnetic Disks ◽  
Coating Method ◽  
Formation Conditions ◽  
Dip Coating Method ◽  
Multiplex Bead

An unstable phenomenon arising at the boundary between PFPE solution dipped and un-dipped zones over DLC coated magnetic disks has been studied. The formation conditions of a ridge of lubricant, or “sierra,” at this boundary and the structure of the “sierra” were clarified. Lubricant film having a step-shaped boundary was first formed by the halfway dip-coating method, and film thickness distribution was then measured around the boundary area. It was found that the film thickness was uniform over the entire lubricated area for a higher speed of withdrawing the disk from the lubricant solution and decreased linearly when the withdrawing speed was lowered. However, the “sierra” structure of the lubricant suddenly formed along the boundary line when the withdrawing speed was further decreased to less than a specified value of around 1 mm/s. The “sierra” was less likely to form for a lower dilution and a longer elapsed time after making the lubricant solution. It was also revealed that, along the ridgeline of the “sierra,” peaks formed periodically and the peak feet propagated in the direction perpendicular to the boundary, forming convex fronts and leaving multiplex bead chains of lubricant accumulations inside the convex.

Fabrication of Uniformly Growing Graphene Films via the Dip-Coating Method

2013 ◽  
Vol 320 ◽  
pp. 185-189
Author(s):  
Juan Yang ◽  
Hong Bo Sun ◽  
Dan Li
Keyword(s):  
Sheet Resistance ◽  
Photoelectron Spectroscopy ◽  
Dip Coating ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Graphene Films ◽  
Coating Method ◽  
Dip Coating Method ◽  
Dip Coating Technique

The graphene (GE) films were fabricated in this paper through the deposition of graphene oxide (GO) sheets onto the quartz slide by means of dip-coating technique, followed by thermal annealing. The growth process and transmittance of the film were monitored by ultraviolet and visible spectrophotometer (UV-Vis), the surface morphology and structure were investigated by Atomic force microscopy (AFM), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman. The sheet resistance of the film was also tested and results showed that the sheet resistance is about 60 kΩ-1and the transmittance is as high as 81 % (at 550 nm).

Porous SiO2/TiO2 Bilayer Antireflection Coatings with Self-Cleaning Capacity

2011 ◽  
Vol 233-235 ◽  
pp. 2970-2974 ◽  
Author(s):  
Ruo Yu Chen ◽  
Jian Wu Wang ◽  
Hong Ning Wang ◽  
Wei Yao ◽  
Jing Zhong
Keyword(s):  
Methyl Orange ◽  
Mechanical Strength ◽  
Sol Gel ◽  
Dip Coating ◽  
Antireflection Coatings ◽  
Force Microscopy ◽  
Atomic Force ◽  
Coating Method ◽  
Self Cleaning ◽  
Dip Coating Method

The porous SiO2/TiO2bilayer antireflection coatings with self-cleaning capacity have been prepared by a sol-gel dip-coating method, the surfactant template, Pluronic F123 (PF123) was added to the sol as a pore generator. The performances of the coatings were analyzed with ultraviolet visible spectrophotometer (UV-Vis), scanning electron microscope (SEM) and atomic force microscopy (AFM). The self-cleaning function of coatings was evaluated by means of photocatalytic degradation of methyl orange in aqueous solution, and mechanical strength of the coatings has also been studied. The results indicate that the average transmittance of porous SiO2/TiO2coating increases by 6% as compared to uncoated glass, the coating has a small particle size, a porous structure and a low roughness. After illuminated by ultraviolet light for 3 h, the 5 mg/L methyl orange can be degraded by 56.5%. In addition, the coating has an excellent mechanical strength.

Structure and Properties of Thin Films Consisting of Single Crystalline BaTiO3 Nanocubes

2013 ◽  
Vol 582 ◽  
pp. 149-152 ◽  
Author(s):  
Kenichi Mimura ◽  
Kazumi Kato
Keyword(s):  
Hydrothermal Reaction ◽  
Piezoresponse Force Microscopy ◽  
Dip Coating ◽  
Structure And Properties ◽  
Single Crystalline ◽  
Force Microscopy ◽  
Atomic Force ◽  
Coating Method ◽  
Dip Coating Method ◽  
Ferroelectric Hysteresis

Single crystalline BaTiO3nanocubes, which were synthesized by hydrothermal reaction with organic surfactants and additives, were assembled in order and directly on the substrates by dip-coating method using the dispersed solution. After evaporation of solvent, the orderly assembly of the nanocubes was developed over the large region in about several tens of micrometers square. It can cover whole surface of the substrate. The microstructures of the nanocube assemblies were evaluated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Electrical property of the nanocube-assembled film was characterized by piezoresponse force microscopy (PFM). The d33-V curve showed ferroelectric hysteresis and saturation behaviors under high applied voltage.

scholarly journals Sol-gel-derived titanium oxide–cerium oxide biocompatible nanocomposite film for urea sensor

2009 ◽  
Vol 24 (5) ◽  
pp. 1667-1673 ◽  
Author(s):  
Anees A. Ansari ◽  
G. Sumana ◽  
M.K. Pandey ◽  
B.D. Malhotra
Keyword(s):  
Titanium Oxide ◽  
Cerium Oxide ◽  
Indium Tin Oxide ◽  
Nanocomposite Film ◽  
Sol Gel ◽  
Electrochemical Techniques ◽  
Dip Coating ◽  
Atomic Force ◽  
Coating Method ◽  
Dip Coating Method

Sol-gel-derived biocompatible titanium oxide–cerium oxide (TiO2–CeO2) nanocomposite film was deposited onto indium tin oxide (ITO)-coated glass substrate by the dip-coating method. This nanobiocomposite film has been characterized using x-ray diffraction, Fourier transform infrared, atomic force microscope, and electrochemical techniques, respectively. The particle size of the TiO2–CeO2 nanobiocomposite film was found to be 23 nm. The urea biosensor fabricated by immobilizing mixed enzyme [urease (Urs) and glutamate dehydrogenase (GLDH)] on this nanobiocomposite showed a response time of 10 s, sensitivity as 0.9165 μAcm−2mM−1, detection limit of 0.166 μM, and negligible effect due to interferants uric acid, cholesterol, glucose, and ascorbic acid. The value of Michaelis–Menten constant (Km) estimated using Lineweaver–Burke plot as 4.8 mM indicated enhancement in the affinity and/or activity of enzyme attached to their nanobiocomposite. This bioelectrode retained 95% of enzyme activity after 6 months at 4 °C.

Varied layer thickness improves structural properties of YSZ thin film

2021 ◽  
pp. 239779142110158
Author(s):  
Nur Fathirah Mohd Rahimi ◽  
Sathiabama T. Thirugnana ◽  
Sib Krishna Ghoshal ◽  
Rosnita Muhammad
Keyword(s):  
Phase Change ◽  
Layer Thickness ◽  
Structural Evolution ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Atomic Force ◽  
Coating Method ◽  
Dip Coating Method ◽  
Deposited Films

In this study, the Yttrium Stabilized Zirconia (YSZ) thin films were deposited on the sapphire substrate (Al2O3) by dip-coating method using simple ethanol-based YSZ suspension. The layer thickness of YSZ films were varied by sintering at 1300°C. Phase change and structural evolution in YSZ films were observed by conducting X-ray diffraction (XRD) analyses. The microstructures and the surface morphology of the deposited films were examined using Atomic Force Microscope (AFM) and Field Emission Scanning Electron Microscope (FESEM). The XRD pattern revealed a phase change from cubic to monoclinic with an increase in YSZ layer thickness. The crystallite size was varied in the range of 9.68–42.98 nm with the changes in the layer thickness. Meanwhile, the AFM image analyses showed a layer thickness-dependent variation in the grain size (205.83–373.77 nm) and the RMS surface roughness (16.72–36.44 nm). The FESEM images of the achieved film exhibited the occurrence of a dense morphology. It was concluded that by controlling the layer thickness of the deposited films, their improved structure and morphology can be achieved.

Synthesis and Characterization of Nanocrystalline TiO2 Thin Films by Sol-Gel Dip Coating Method

2013 ◽  
Vol 678 ◽  
pp. 108-112 ◽  
Author(s):  
Narayanaswamy Gokilamani ◽  
N. Muthukumarasamy ◽  
Mariyappan Thambidurai
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Atomic Force ◽  
Coating Method ◽  
Nanocrystalline Titanium ◽  
Dip Coating Method

Nanocrystalline titanium dioxide (TiO2) thin films have been prepared by dip coating method. The TiO2 thin films have been coated on glass substrate and annealed at 400, 450 and 500° C respectively. The X- ray diffraction pattern shows that TiO2 nanocrystalline thin films are of anatase structure and the grain size is found to be in the range of 20-35 nm. The annealed films have been observed to be nanocrystalline in nature and the crystallinity has been observed to improve on annealing. The surface topography of the films has been studied using atomic force microscope. The optical properties have been studied using transmittance spectra. The band gap has been found to lie in the range of 3.70 to 3.83 eV depending on the annealing temperature.

scholarly journals Dip-Coating Approach to Fabricate Durable PDMS/STA/SiO2 Superhydrophobic Polyester Fabrics

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 326
Author(s):  
Xiaoli Liu ◽  
Youcai Gu ◽  
Tengfei Mi ◽  
Xiaomei Wang ◽  
Xu Zhang
Keyword(s):  
Contact Angle ◽  
Textile Industry ◽  
Dip Coating ◽  
Water Contact ◽  
Force Microscopy ◽  
Superhydrophobic Coatings ◽  
Atomic Force ◽  
High Durability ◽  
Coating Method ◽  
Dip Coating Method

The facile, simple, highly efficient, and fluorine-free fabrication of superhydrophobic surfaces on fabrics with high durability has attracted considerable attention because of its urgent practical application. The simple dip-coating method was adopted to make a stable and durable polydimethylsiloxane/stearic acid/silica (PDMS/STA/SiO2) superhydrophobic fabric. The fabric’s surface morphology, roughness, and composition were analyzed by scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy, respectively. The PDMS/STA/SiO2-coated fabric: demonstrated strong superhydrophobicity (a water contact angle (WCA) of around 163°), efficiently repelled different liquids (milk, coffee, orange juice, Coca-Cola, and 1 M of HCl and NaOH) with a contact angle above 155°, had excellent self-cleaning performance, and retained superhydrophobicity with a WCA greater than 150° after 72 h of ultraviolet irradiation and 700 cycles of mechanical abrasion. The PDMS/STA/SiO2 coating had few influences on the color fastness of the fabric. Superhydrophobic coatings are expected to be practically applied in the textile industry.

Properties of zirconia films dispersed with PbS nanoparticles

2000 ◽  
Vol 15 (11) ◽  
pp. 2343-2346 ◽  
Author(s):  
Weimin Huang ◽  
Jianlin Shi
Keyword(s):  
Fluorescence Emission ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Third Order ◽  
Pbs Nanoparticles ◽  
Nonlinear Properties ◽  
Transmission Electron ◽  
Optical Films ◽  
Coating Method ◽  
Dip Coating Method

PbS/ZrO2 optical films were prepared by the dip-coating method from a mixed sol containing two precursors, Zr(OC3H7)4 and Pb(CH3COO)2. The phase structure and size of PbS nanoparticles were characterized by x-ray diffraction and transmission electron microscopy, respectively. Optical absorption and fluorescence spectra were taken on the PbS/ZrO2 films. Larger blue shifts of band edge and weak fluorescence emission of PbS were observed. The third-order nonlinear properties of PbS/ZrO2 films were studied. The calculated values of nonlinear refractive indexes n2 varied between 10−8 and 10−9 cm2/W.

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