Novel Honeycomb-Microstructured Asphalt Composite Coatings for Sustainable Photocatalytic Application

2014 ◽  
Vol 905 ◽  
pp. 310-313
Author(s):  
Jian Liang Gong ◽  
Bin Gang Xu ◽  
Hua Yang Yu ◽  
Xiao Ming Tao
Keyword(s):  
Photocatalytic Performance ◽  
Composite Coatings ◽  
Solution Concentration ◽  
Sem Images ◽  
Compact Sample ◽  
Photocatalytic Application ◽  
Asphalt Materials ◽  
Reduction Efficiency ◽  
Porous Microstructures ◽  
Continuous Use

The microstructure of asphalt materials on photocatalytic performance was studied in this work. Firstly, asphalt composite coatings with highly ordered honeycomb microstructures were fabricated by a bottom-up approach through adjusting the solution concentration and the content of polystyrene (PS) additive. Further incorporation of titanium dioxide (TiO2) nanoparticles endows the porous coatings with photocatalytic functionality. SEM images demonstrate that TiO2nanoparticles disperse and decorate on the pore walls of coating. In comparison to the compact coatings prepared by traditional method, the obtained honeycomb microstructured asphalt/PS/TiO2coatings possess an enhanced and sustainable efficiency of removing NOx. Specifically, when introducing porous microstructures to the coating, the NOxreduction efficiency is 16% higher than that of traditional compact sample and shows no attenuation in continuous use.

Enhanced Photocatalytic Performance of Sn6SiO8 Nanoparticles and Their Reduced Graphene Oxide (rGO) Nanocomposite

2020 ◽  
Vol 20 (9) ◽  
pp. 5426-5432
Author(s):  
G. Gnanamoorthy ◽  
M. Muthukumaran ◽  
P. Varun Prasath ◽  
V. Karthikeyan ◽  
V. Narayanan ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Dye Degradation ◽  
Hexagonal Phase ◽  
Active Species ◽  
Organic Chemical ◽  
Light Illumination ◽  
Sem Images ◽  
Radical Trapping

Photocatalysts provide excellent potential for the full removal of organic chemical pollutants as an environmentally friendly technology. It has been noted that under UV-visible light irradiation, nanostructured semiconductor metal oxides photocatalysts can degrade different organic pollutants. The Sn6SiO8/rGO nanocomposite was synthesized by a hydrothermal method. The Sn6SiO8 nanoparticles hexagonal phase was confirmed by XRD and functional groups were analyzed by FT-IR spectroscopy. The bandgap of Sn6SiO8 nanoparticles (NPs) and Sn6SiO8/GO composites were found to be 2.7 eV and 2.5 eV, respectively. SEM images of samples showed that the flakes like morphology. This Sn6SiO8/rGO nanocomposite was testing for photocatalytic dye degradation of MG under visible light illumination and excellent response for the catalysts. The enhancement of photocatalytic performance was mainly attributed to the increased light absorption, charge separation efficiency and specific surface area, proved by UV-vis DRS. Further, the radical trapping experiments revealed that holes (h+) and superoxide radicals (·O−2) were the main active species for the degradation of MG, and a possible photocatalytic mechanism was discussed.

scholarly journals Simulation of FIB-SEM Images for Analysis of Porous Microstructures

Scanning ◽  
2012 ◽  
Vol 35 (3) ◽  
pp. 189-195 ◽  
Author(s):  
Torben Prill ◽  
Katja Schladitz
Keyword(s):  
Sem Images ◽  
Porous Microstructures

scholarly journals Fabrication and Characterization of Zein/Hydroxyapatite Composite Coatings for Biomedical Applications

Surfaces ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 237-250 ◽  
Author(s):  
Yusra Ahmed ◽  
Muhammad Yasir ◽  
Muhammad Atiq Ur Rehman
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Sem Images ◽  
Taguchi Design Of Experiments ◽  
Hydrophilic Nature ◽  
Strong Adhesion ◽  
Steel Substrates

Stainless steel is renowned for its wide use as a biomaterial, but its relatively high corrosion rate in physiological environments restricts many of its clinical applications. To overcome the corrosion resistance of stainless steel bio-implants in physiological environments and to improve its osseointegration behavior, we have developed a unique zein/hydroxyapatite (HA) composite coating on a stainless steel substrate by Electrophoretic Deposition (EPD). The EPD parameters were optimized using the Taguchi Design of experiments (DoE) approach. The EPD parameters, such as the concentration of bio-ceramic particles in the polymer solution, applied voltage and deposition time were optimized on stainless steel substrates by applying a mixed design orthogonal Taguchi array. The coatings were characterized by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and wettability studies. SEM images and EDX results indicated that the zein/HA coating was successfully deposited onto the stainless steel substrates. The wettability and roughness studies elucidated the mildly hydrophilic nature of the zein/HA coatings, which confirmed the suitability of the developed coatings for biomedical applications. Zein/HA coatings improved the corrosion resistance of bare 316L stainless steel. Moreover, zein/HA coatings showed strong adhesion with the 316L SS substrate for biomedical applications. Zein/HA developed dense HA crystals upon immersion in simulated body fluid, which confirmed the bone binding ability of the coatings. Thus the zein/HA coatings presented in this study have a strong potential to be considered for orthopedic applications.

Effective Cocatalyst Pt/PtO Nanodots on La2O3 Microspheres for Degradation of Methyl Orange

2020 ◽  
Vol 20 (5) ◽  
pp. 3140-3147 ◽  
Author(s):  
Zehao Zhao ◽  
Jiaolong Liu ◽  
Ming Qin ◽  
Kaichang Kou ◽  
Guanglei Wu ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Organic Pollutants ◽  
Rate Constant ◽  
Shell Structure ◽  
Photocatalytic Performance ◽  
Xps Analysis ◽  
Sem Images ◽  
Promising Strategy ◽  
Xrd Patterns ◽  
Degradation Of Methyl Orange

Platinum (Pt) has been intensively studied as an effective cocatalyst for photocatalysis, but most reports have focused on metallic Pt rather than PtO. Here, Pt/PtO nanodots were deposited on porous yolk–shell La2O3 microspheres. XRD patterns and XPS analysis demonstrated the coexistence of Pt and PtO, which was beneficial for photocatalytic performance. SEM images showed the yolk–shell structure of La2O3, and TEM images demonstrated that the Pt/PtO nanodots were uniformly distributed on the La2O3 microspheres. The rate constant of the hybrid was calculated to be 0.00656 min−1 for methyl orange (MO) degradation, while that of bare La2O3 was only 0.00303 min−1. This work suggests that the use of the deposited cocatalyst Pt/PtO on La2O3 microspheres is a promising strategy for the degradation of organic pollutants.

scholarly journals Recyclable SERS-Based Immunoassay Guided by Photocatalytic Performance of Fe3O4@TiO2@Au Nanocomposites

Biosensors ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 25 ◽  
Author(s):  
Yuanyuan Du ◽  
Hongmei Liu ◽  
Yiran Tian ◽  
Chenjie Gu ◽  
Ziqi Zhao ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Limit Of Detection ◽  
Specific Antigen ◽  
High Sensitivity ◽  
Shell Nanoparticles ◽  
Sem Images ◽  
Potential Measurement ◽  
Surface Enhanced Raman ◽  
Clinical Measurements ◽  
Core Shell Nanoparticles

A novel recyclable surface-enhanced Raman scattering (SERS)-based immunoassay was demonstrated and exhibited extremely high sensitivity toward prostate specific antigen (PSA). The immunoassay, which possessed a sandwich structure, was constructed of multifunctional Fe3O4@TiO2@Au nanocomposites as immune probe and Ag-coated sandpaper as immune substrate. First, by adjusting the density of outside Au seeds on Fe3O4@TiO2 core-shell nanoparticles (NPs), the structure-dependent SERS and photocatalytic performance of the samples was explored by monitoring and degradating 4-mercaptobenzonic acid (4MBA). Afterwards, the SERS enhancement capability of Ag-coated sandpaper with different meshes was investigated, and a limit of detection (LOD), as low as 0.014 mM, was achieved by utilizing the substrate. Subsequently, the recyclable feasibility of PSA detection was approved by zeta potential measurement, absorption spectra, and SEM images and, particularly, more than 80% of SERS intensity still existed after even six cycles of immunoassay. The ultralow LOD of the recyclable immunoassay was finally calculated to be 1.871 pg/mL. Therefore, the recyclable SERS-based immunoassay exhibits good application prospects for diagnosis of cancer in clinical measurements.

Assembly of a CdS quantum dot–TiO2 nanobelt heterostructure for photocatalytic application: towards an efficient visible light photocatalyst via facile surface charge tuning

2015 ◽  
Vol 39 (1) ◽  
pp. 279-286 ◽  
Author(s):  
Junyu Zhang ◽  
Fang-Xing Xiao ◽  
Guangcan Xiao ◽  
Bin Liu
Keyword(s):  
Quantum Dot ◽  
Visible Light ◽  
Surface Charge ◽  
Self Assembly ◽  
Photocatalytic Performance ◽  
Visible Light Photocatalyst ◽  
Photocatalytic Application ◽  
Cds Quantum Dot

CdS QD sensitized TiO2 nanobelt nanostructures were fabricated by a facile self-assembly approach and the photocatalytic performance of the well-defined hybrid heterostructure was systematically probed.

scholarly journals Porous V2O5/TiO2 Nanoheterostructure Films with Enhanced Visible-Light Photocatalytic Performance Prepared by the Sparking Method

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3327
Author(s):  
Porntipa Pooseekheaw ◽  
Winai Thongpan ◽  
Arisara Panthawan ◽  
Ekkapong Kantarak ◽  
Wattikon Sroila ◽  
...  
Keyword(s):  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Performance ◽  
Composite Films ◽  
Cost Effective ◽  
Atomic Ratio ◽  
Pure Tio2 ◽  
Sem Images ◽  
Transmission Electron ◽  
Highly Correlated

Porous V2O5/TiO2 nanoheterostructure films with different atomic ratios of Ti/V (4:1, 2:1, 1:1, and 1:2) were synthesized by a sparking method for the first time. The sparking method, which is a simple and cost-effective process, can synthesize highly porous and composite films in one step. Field-emission scanning electron microscope (FE-SEM) images revealed the porosity morphology of all prepared samples. V2O5/TiO2 nanoheterostructure films were confirmed by Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The secondary particle size and band gap of the samples were highly correlated to the V2O5 proportion, resulting in enhanced visible-light absorbance. V2O5/TiO2 nanoheterostructure films at an atomic ratio of 1:1 showed the highest photocatalytic performance, which improved the degradation rate up to 24% compared to pure TiO2 film. It is believed that the formed nanoheterostructure and greater portion of V4+ ions are reflected by this ratio.

Morphology of Electrospun Natural Rubber with Acrylonitrile-Butadiene-Styrene

2009 ◽  
Vol 79-82 ◽  
pp. 1583-1586 ◽  
Author(s):  
Sarawuth Sithornkul ◽  
Poonsub Threepopnatkul
Keyword(s):  
Natural Rubber ◽  
Fiber Diameter ◽  
Electrospun Fiber ◽  
Acrylonitrile Butadiene Styrene ◽  
Solution Concentration ◽  
Electrospun Membrane ◽  
Sem Images ◽  
Electrospinning Technique ◽  
Tetramethylthiuram Disulfide ◽  
Butadiene Styrene

This research was aimed to study the electrospinning of natural rubber (NR)-acrylonitrile butadiene styrene (ABS) blend. The NR used in this research was compounded in a torque rheometor, with stearic acid, wingstay-L, dibenzothiazoledisulfide (MBTS), tetramethylthiuram disulfide (TMTD) and sulfur, respectively. The compounded NR was blended with ABS by dissolving them in tetrahydrofuran (THF), concentration of solution included 5, 10, and 15 w/w%. The ratio of NR/ABS was varied by varying the content of ABS of 20, 30, 40 and 50 wt%. Then NR/ABS electrospun membrane was built up by electrospinning technique with high voltage 15 kV, flow rate 30 ml/h, collector distance 15, 20 and 25 cm and collected the electrospun fiber on rotating circular at 1000 rpm. The morphology of electrospun fibers were characterized by scanning electron microscope (SEM). SEM images showed that NR/ABS membranes had higher porosity with decreasing ABS contents. Decreasing ABS contents, decreasing solution concentration and increasing collector distance decreased fiber diameter of electrospun NR/ABS.

scholarly journals Fabrication and Characterization of Ag-Sr Doped Hydroxyapatite/chitosan Coatings Deposited on 316L SS via Electrophoretic Deposition

2020 ◽  
Author(s):  
Muhammad Wahaj ◽  
Usama Saleem ◽  
Farasat Iqbal ◽  
Muhammad Yasir ◽  
Abdul Wadood ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Composite Coatings ◽  
Gram Negative Bacteria ◽  
Sem Images ◽  
Hydrophilic Nature ◽  
Deposition Voltage ◽  
Orthopedic Applications ◽  
Chitosan Composite

In this study, silver-strontium doped hydroxyapatite (AgSr-HA)/chitosan composite coatings were deposited on stainless steel (SS) substrate via electrophoretic deposition (EPD) technique. The EPD parameters such as the concentration of Ag Sr-HA particles in the suspension, applied voltage and deposition time were optimized on by the Taguchi Design of Experiment (DoE) approach. DOE approach elucidated that the “best” coating was obtained at; the deposition voltage of 20V, deposition time of 7 minutes, and at 5 g/L of Ag Sr-HA particles in the suspension. The optimum coatings were characterized by using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. SEM images confirmed the deposition of chitosan/Ag Sr-HA on the SS substrate. The wettability studies indicated the hydrophilic nature of the chitosan/Ag Sr-HA coatings, which confirmed the suitability of the developed coatings for orthopedic applications. The average surface roughness of the chitosan/Ag Sr-HA coatings was in a suitable range for the attachment of bone marrow stromal cells. Chitosan/Ag Sr-HA coatings showed a potent antibacterial effect against the Gram-Positive and Gram-negative bacteria.

scholarly journals Electroless Deposition of Composite Nickel-Phosphorous Coatings with Diamond Dispersoid

2016 ◽  
Vol 61 (2) ◽  
pp. 493-498 ◽  
Author(s):  
M. Petrova ◽  
M. Georgieva ◽  
V. Chakarova ◽  
E. Dobreva
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Composition ◽  
Electroless Deposition ◽  
Deposition Time ◽  
Composite Coatings ◽  
Flexible Substrates ◽  
Optimal Conditions ◽  
Sem Images ◽  
Scanning Electron

AbstractThe composite Ni-P coating with diamond particles (D) deposited on the flexible substrates of pressed polyethylene terephthalate material (PET) was obtained, to be used in the development of efficient, flexible grinding and polishing tools. The optimal conditions of the hydrodynamic regime, deposition time and temperature were found. The influence of the concentration and size of the D particles (3/7 ÷ 225/300 μm) on the coating thickness and number of co-deposited particles were studied. By Scanning Electron Microscopy (SEM) images were defined the morphology of dispersion coatings and number of co-deposited particles in them, and Energy Dispersive Spectroscopy (EDS/INCA) was used to determine the elemental chemical composition of the composite coatings.

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