scholarly journals Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

2021 ◽  
Keyword(s):  
Organic Compound ◽  
High Efficiency ◽  
Combustion Method ◽  
Nanostructured Catalyst ◽  
Thiophene Hydrodesulfurization ◽  
Ultrasonic Assisted ◽  
Compound Type

Abstract The authors have requested that this preprint be withdrawn due to erroneous posting.

Synergistic effects and mechanism of a non-thermal plasma catalysis system in volatile organic compound removal: a review

2018 ◽  
Vol 8 (4) ◽  
pp. 936-954 ◽  
Author(s):  
Xinxin Feng ◽  
Hongxia Liu ◽  
Chi He ◽  
Zhenxing Shen ◽  
Taobo Wang
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Thermal Plasma ◽  
Carbon Balance ◽  
High Efficiency ◽  
Synergistic Effects ◽  
Product Selectivity ◽  
Plasma Catalysis ◽  
Volatile Organic ◽  
Non Thermal Plasma

Non-thermal plasma catalysis with high efficiency, high by-product selectivity and superior carbon balance is one of the most promising technologies in the control of volatile organic compounds (VOCs).

Synthesis of Functional Ionic Liquids by Thermal Heating and Ultrasonic-Assisted Methods

2012 ◽  
Vol 581-582 ◽  
pp. 326-329
Author(s):  
Zhe Zhang ◽  
Yi He Li ◽  
Hua Xiao ◽  
Chi Zhou Tu ◽  
Chun Hua Wang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Mild Condition ◽  
High Efficiency ◽  
Ester Group ◽  
Synthesis Condition ◽  
Synthesis Methods ◽  
Thermal Heating ◽  
Heating Method ◽  
Ultrasonic Assisted

1-(2-Methacryloyloxy)ethyl-3-butylimidazolium bromide, a kind of functional ionic liquid containing ester group, was synthesized by two synthesis methods, denoted as thermal heating method and ultrasonic-assisted method. The optimal synthesis condition of the thermal heating method is discussed. Comparison of the two methods shows that ultrasound significantly enhances the efficiency of the reaction. The ultrasonic-assisted method is quite promising in synthesis of ionic liquids with mild condition and high efficiency.

scholarly journals UARM Effective Route for Cu- and Zn- MOFs as Highly Efficient Adsorbents Towards Arsine (AsH3) Gas Adsorption: Design and a Systematic Study

2021 ◽  
Author(s):  
Taher Shahriari ◽  
Parya Kazemzadeh ◽  
Malihe Zeraati ◽  
ghasem sargazi
Keyword(s):  
Systematic Study ◽  
High Efficiency ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Fractional Factorial ◽  
Synthetic Methods ◽  
Experimental Parameters ◽  
Ultrasonic Assisted ◽  
And Control ◽  
Cu And Zn

Abstract Since it is essential to select the adsorbents, which are prepared with fast, environmentally friendly, and affordable methods, therefore, in this study, the Cu- and Zn- metal organic framework nanostructures were synthesized in the shortest route with the high efficiency by the effective method of ultrasonic assisted inverse micelle (UAIM) method. The synthesized samples were used as the new adsorbents in the arsine gas adsorption. The physicochemical properties of the products were examined in detail, so that the adsorbent dosage, temperature and pressure for the preparation of samples with distinctive characteristics were 0.05 mg, 25.00 °C, and 5.00 bar, respectively. Since the design and control of experimental parameters to find the best conditions for producing the samples with high adsorption efficiency is essential in this process, thus, for this purpose, fractional factorial design and response surface methodology were used. The results indicated the high efficiency of arsine gas adsorption for the synthesized samples in optimized conditions. The differences between arsine gas adsorption in this study in comparison with the previous studies could be due to the characteristic’s improvement using the effective synthetic methods as well as the systematic study of experimental parameters.

Fundamental Machining Characteristics of Ultrasonic Assisted Turning of Titanium Alloy Ti-6Al-4V

2013 ◽  
Vol 797 ◽  
pp. 344-349 ◽  
Author(s):  
Yong Bo Wu ◽  
Jing Ti Niu ◽  
M. Fujimoto ◽  
Mitsuyoshi Nomura
Keyword(s):  
Titanium Alloy ◽  
Cutting Force ◽  
High Efficiency ◽  
Experimental Investigations ◽  
Work Surface ◽  
Ultrasonic Assisted ◽  
Cutting Force Components ◽  
Level 3 ◽  
Force Components ◽  
Machining Characteristics

In this paper, a new machining method is proposed for the high efficiency turning of titanium alloy Ti-6Al-4V in which the cutting tool is ultrasonically vibrated. An experimental setup is constructed by installing an ultrasonic cutting unit onto a NC lathe followed by experimental investigations on the fundamental machining characteristics. The results obtained in the current work showed that (1) the cutting force decreases with the increase in the power supplying level (i.e., the ultrasonic vibration (UV) amplitude), e.g., the cutting force components in X-. Y-and Z-directions were decreased by 48%, 45% and 87%, respectively, once the UV has been applied to the tool at the power supplying level of 50%; (2) the cutting marks with knit pattern are formed on work-surface with UV while the parallel distributed cutting marks are generated without UV, and the surface roughness is decreased by up to 10% when the UV is applied at an appropriate power supplying level; (3) the work-surface straightness is improved by 46% once the UV is applied.

Photoelectrocatalytic and Ultrasonic-Assisted Effects for Organic Dye Degradation Using Zinc Oxide (ZnO) Electrode

2019 ◽  
Vol 798 ◽  
pp. 404-411
Author(s):  
Chirarat Lunkham ◽  
Piyalak Ngernchuklin ◽  
Chatchai Ponchio
Keyword(s):  
Cyclic Voltammetry ◽  
Water Oxidation ◽  
High Efficiency ◽  
Electrochemical Impedance ◽  
Dye Degradation ◽  
Dip Coating ◽  
Organic Dye ◽  
Simple Method ◽  
Ultrasonic Assisted ◽  
Oxidation Efficiency

The organic dye is one of the carcinogenic and toxic substrates that are used as the colorant in industries. Therefore, we have to develop the efficient technique to remove the dye in wastewater. This research aimed to develop the photoelectrocatalytic (PEC) cell with the high efficiency, which offered a simple method to remove dye from the wastewater. The ZnO photoanode electrode was considered for developing to enhance the efficiency of PEC cell for dye degradation. The ZnO electrode was fabricated by cyclic voltammetry method and then was compared the oxidation efficiency to ZnO electrode from dip coating. The film thickness of ZnO was controlled by the number of scan for a cyclic voltammetric method and the deposition time for the dip coating method. The effects of scan rate, the number of scan and calcination temperature were optimized to obtain the highest oxidation efficiency. Absorption properties, photoelectrocatalytic activity and electrochemical impedance spectroscopy (EIS) were measured to confirm the characteristic of the two fabricated electrodes. The results showed that ZnO electrode fabricated by cyclic voltammetry presented higher photoelectrocatalytic activity for water oxidation than that from dip coating. Thus, in this research was development ZnO electrode by cyclic voltammetry to degrade organic dye using the photoelectrocatalytic technique. The efficiency of dye degradation was evaluated by the decreasing absorption of methylene blue dye (5 mg/L) as a function of time. It was found that the photoelectrocatalytic dye degradation efficiency with ultrasonic-assisted was enhanced up to two times with 71% degradation in 1 hour. Therefore, we concluded that the developed ZnO electrode by cyclic voltammetry demonstrated a high photoelectrocatalytic performance with ultrasonic-assisted degradation of organic dyes.

Research on Ultrasonic-Assisted Fixed-Abrasive Lapping Technology for Engineering Ceramics Cylindrical Part

2017 ◽  
Vol 5 (2) ◽  
Author(s):  
Feng Jiao ◽  
Bo Zhao
Keyword(s):  
Ultrasonic Vibration ◽  
Material Removal ◽  
High Efficiency ◽  
Removal Rate ◽  
Tangential Force ◽  
Cylindrical Part ◽  
Engineering Ceramics ◽  
Machining Quality ◽  
Ultrasonic Assisted ◽  
Fixed Abrasive

Lapping is a key processing step for precision parts, which directly affects machining quality, precision, and efficiency. Due to some drawbacks of free-abrasive lapping such as deep scratches on the lapped surface, lower lapping efficiency for lower lapping speed, severe waste of abrasive, high-processing cost, and so on, conventional fixed-abrasive lapping (CFL) technology was proposed and developed recently. Meanwhile, considering the unique advantages of the ultrasonic-assisted machining during the processing of those hard and brittle materials and the effect of ultrasonic vibration on the self-sharpening characteristic of abrasive pellet, a novel ultrasonic-assisted fixed-abrasive lapping (UAFL) technology is put forward and corresponding lapping device for engineering ceramics cylindrical part is developed in this paper. Meanwhile, UAFL mechanism and characteristics were studied theoretically and experimentally. Research results show that superimposed ultrasonic vibration changes the lapping movement characteristics and material removal mechanism to a certain extent, helping to heighten material removal rate, smoothen the waveform of tangential force, reduce the average tangential force, and improve surface machining quality. UAFL can be regarded as a high efficiency and precision processing technology for engineering ceramics cylindrical part.

Study on Ultra - High Pressure Assisted Extraction of Polysaccharides from Umbilicaria in Yellow Mountain

2020 ◽  
Vol 980 ◽  
pp. 187-196
Author(s):  
Ke Kui Sun ◽  
Ji Ang Wei
Keyword(s):  
High Pressure ◽  
High Efficiency ◽  
Hot Water ◽  
Ultra High Pressure ◽  
Theoretical Yield ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction ◽  
Solid Liquid ◽  
Single Factor Experiment

The effect of ultra-high pressure technology on the extraction of polysaccharides from Huangshan Stone Ear was studied. The effects of solid-liquid ratio, pressure and time on the yield of polysaccharides from umbilicaria were investigated by single factor experiment, and the experiment was optimized by response surface experiment design. Under the conditions of pressure maintaining time of 14.36 min, pressure of 303 MPa and ratio of solid to liquid of 1: 54, the theoretical yield of polysaccharides was12.85±1.32%, 1.18 times as high as that of hot water extraction and 1.39 times as high as that of ultrasonic-assisted extraction. This experiment proved that it is feasible to use ultra-high pressure technology to assist in the extraction of stone ear polysaccharides. Meanwhile, the ultra-high pressure technology also has the advantages of high efficiency, environmental protection and low temperature requirement, which provides a new and efficient method for extraction of polysaccharides from umbilicaria.

scholarly journals Study on Improving the Precise Machinability of Single Crystal SiC by an Ultrasonic-Assisted Hybrid Process

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7320
Author(s):  
Dong Shi ◽  
Tianchen Zhao ◽  
Tengfei Ma ◽  
Jinping Pan
Keyword(s):  
Single Crystal ◽  
High Efficiency ◽  
Surface Defects ◽  
Removal Rate ◽  
Oxide Semiconductor ◽  
Hybrid Process ◽  
Ultrasonic Assisted ◽  
Single Crystal Sic ◽  
Surface Damages ◽  
Sic Wafer

Silicon carbide (SiC) devices have become one of the key research directions in the field of power electronics. However, due to the limitation of the SiC wafer growth process and processing capacity, SiC devices, such as SiC MOSFET (Metal-oxide-semiconductor Field-effect Transistor), are facing the problems of high cost and unsatisfied performance. To improve the precise machinability of single-crystal SiC wafer, this paper proposed a new hybrid process. Firstly, we developed an ultrasonic vibration-assisted device, by which ultrasonic-assisted lapping and ultrasonic-assisted CMP (chemical mechanical polishing) for SiC wafer were fulfilled. Secondly, a novel three-step ultrasonic-assisted precise machining route was proposed. In the first step, ultrasonic lapping using a cast iron disc was conducted, which quickly removed large surface damages with a high MRR (material removal rate) of 10.93 μm/min. In the second step, ultrasonic lapping using a copper disc was conducted, which reduced the residual surface defects with a high MRR of 6.11 μm/min. In the third step, ultrasonic CMP using a polyurethane pad was conducted, which achieved a smooth and less damaged surface with an MRR of 1.44 μm/h. These results suggest that the ultrasonic-assisted hybrid process can improve the precise machinability of SiC, which will hopefully achieve high-efficiency and ultra-precision machining.

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