High-efficiency nano polishing of steel materials

Abstract The application of a specific rheological polishing slurry is proposed first for high-efficiency machining of steel materials to achieve high-quality ultraprecision finished surfaces. The rheology of the polishing slurry was explored to show that the non-Newtonian medium with certain parameters of content components exhibits shear-thickening behavior. Then the new high-efficiency nano polishing approach is applied to process spherical surfaces of bearing steel. Several controllable parameters such as shear rheology, abrasive data, rotational speed, and processing time are experimentally investigated in this polishing process. A special finding is that the surface roughness and material removal rate can increase simultaneously when a small abrasive size is applied due to the thickening mechanism during the shearing flow of slurries. Excessive abrasives can decrease surface quality due to the uneven agglomeration of particles scratching the surface. Under optimized conditions, a high-accuracy spherical bearing steel surface with a roughness of 12.6 nm and roundness of 5.3 μm was achieved after a processing time of 2.5 h. Thus, a potential ultraprecision machining method for target materials is obtained in this study.

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Surface integrity of bearing steel element with a new high-efficiency shear thickening polishing technique

Procedia CIRP ◽

10.1016/j.procir.2018.05.030 ◽

2018 ◽

Vol 71 ◽

pp. 313-316 ◽

Cited By ~ 2

Author(s):

Min Li ◽

Zhenrong Huang ◽

Ting Dong ◽

Meijiao Mao ◽

Binghai Lyu ◽

...

Keyword(s):

Surface Integrity ◽

High Efficiency ◽

Shear Thickening ◽

Bearing Steel

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Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants

Water ◽

10.3390/w13131732 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1732

Author(s):

Yuanyuan Yu ◽

Yongjun Sun ◽

Jun Zhou ◽

Aowen Chen ◽

Kinjal J. Shah

Keyword(s):

Heavy Metal ◽

Reaction Time ◽

High Efficiency ◽

Removal Rate ◽

Low Cost ◽

Monomer Concentration ◽

Synthesis Process ◽

Response Surface Optimization ◽

Metal Capture ◽

Total Monomer Concentration

In this study, a high-efficiency magnetic heavy metal flocculant MF@AA was prepared based on carboxymethyl chitosan and magnetic Fe3O4. It was characterized by SEM, FTIR, XPS, XRD and VSM, and the Cu(II) removal rate was used as the evaluation basis for the preparation process. The effects of AMPS content, total monomer concentration, photoinitiator concentration and reaction time on the performance of MF@AA flocculation to remove Cu(II) were studied. The characterization results show that MF@AA has been successfully prepared and exhibits good magnetic induction characteristics. The synthesis results show that under the conditions of 10% AMPS content, 35% total monomer concentration, 0.04% photoinitiator concentration, and 1.5 h reaction time, the best yield of MF@AA is 77.69%. The best removal rate is 87.65%. In addition, the response surface optimization of the synthesis process of MF@AA was performed. The optimal synthesis ratio was finally determined as iron content 6.5%, CMFS: 29.5%, AM: 53.9%, AMPS: 10.1%. High-efficiency magnetic heavy metal flocculant MF@AA shows excellent flocculation performance in removing Cu(II). This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove Cu(II) in wastewater.

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Shear thickening behavior in dense repulsive and attractive suspensions of hard spheres

Soft Matter ◽

10.1039/d1sm00971k ◽

2021 ◽

Author(s):

Vikram Rathee ◽

Alessandro Monti ◽

Marco Edoardo Rosti ◽

Amy Q Shen

Keyword(s):

Flow Curve ◽

Hard Spheres ◽

Shear Thickening ◽

Colloidal Suspensions ◽

Thickening Behavior ◽

The Stability

Shear thickening in stable dense colloidal suspensions is a reversible phenomenon and no hysteresis is observed in the flow curve measurements. However, a reduction in the stability of colloids promotes...

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Stability, rheological property and oil-displacement mechanism of a dispersed low-elastic microsphere system for enhanced oil recovery

RSC Advances ◽

10.1039/c6ra26849h ◽

2017 ◽

Vol 7 (14) ◽

pp. 8118-8130 ◽

Cited By ~ 24

Author(s):

Hongbin Yang ◽

Wanli Kang ◽

Hairong Wu ◽

Yang Yu ◽

Zhou Zhu ◽

...

Keyword(s):

Rheological Property ◽

Enhanced Oil Recovery ◽

Oil Recovery ◽

Shear Thickening ◽

Microstructure Change ◽

Displacement Mechanism ◽

Oil Displacement ◽

Internal Forces ◽

Thickening Behavior

The dispersed low-elastic microsphere system shows shear-thickening behavior because of the microstructure change and the interaction of internal forces.

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Silica Nanoflowers-Stabilized Pickering Emulsion as a Robust Biocatalysis Platform for Enzymatic Production of Biodiesel

Catalysts ◽

10.3390/catal9121026 ◽

2019 ◽

Vol 9 (12) ◽

pp. 1026 ◽

Cited By ~ 2

Author(s):

Lihui Wang ◽

Xinlong Liu ◽

Yanjun Jiang ◽

Peng Liu ◽

Liya Zhou ◽

...

Keyword(s):

High Efficiency ◽

Pickering Emulsion ◽

Biodiesel Production ◽

Candida Antarctica Lipase ◽

Waste Oil ◽

Enzymatic Production ◽

Mild Conditions ◽

Experimental Yield ◽

Optimized Conditions ◽

Better Than

Enzymatic production of biodiesel had attracted much attention due to its high efficiency, mild conditions and environmental protection. However, the high cost of enzyme, poor solubility of methanol in oil and adsorption of glycerol onto the enzyme limited the popularization of the process. To address these problems, we developed a silica nanoflowers-stabilized Pickering emulsion as a biocatalysis platform with Candida antarctica lipase B (CALB) as model lipase for biodiesel production. Silica nanoflowers (SNFs) were synthesized in microemulsion and served as a carrier for CALB immobilization and then used as an emulsifier for constructing Pickering emulsion. The structure of SNFs and the biocatalytic Pickering emulsion (CALB@SNFs-PE) were characterized in detail. Experimental data about the methanolysis of waste oil to biodiesel was evaluated by response surface methodology. The highest experimental yield of 98.5 ± 0.5% was obtained under the optimized conditions: methanol/oil ratio of 2.63:1, a temperature of 45.97 °C, CALB@SNFs dosage of 33.24 mg and time of 8.11 h, which was closed to the predicted value (100.00%). Reusability test showed that CALB@SNFs-PE could retain 76.68% of its initial biodiesel yield after 15 cycles, which was better than that of free CALB and N435.

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The Effect of Rheology of Viscoelastic Polymer on Pressure Transient Response in Near-Wellbore Regions

Geofluids ◽

10.1155/2021/5568336 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Jia Zhang ◽

Shiqing Cheng ◽

Jie Zhan ◽

Qi Han

Keyword(s):

Shear Thickening ◽

Shear Thinning ◽

Polymer Flooding ◽

High Shear ◽

Pressure Data ◽

Transient Pressure ◽

Pressure Derivative ◽

Shear Rates ◽

Viscoelastic Polymer ◽

Thickening Behavior

Viscoelastic polymer solution shows shear thinning behavior at low shear rates and shear thickening behavior at high shear rates in reservoirs. However, models that ignored shear thickening behavior were commonly employed to interpret transient pressure data derived from tested wells in viscoelastic polymer flooding systems; although, viscoelastic polymer solutions show shear thickening behavior in the near-wellbore region due to high shear rate. To better characterize the oilfield with pressure transient analysis in viscoelastic polymer flooding systems, we developed a numerical model that takes into account both shear thinning behavior and shear thickening behavior. A finite volume method was employed to discretize partially differential flow equations in a hybrid grid system including PEBI mesh and Cartesian grid, and the Newton-Raphson method was used to solve the fully implicit nonlinear system. To illustrate the significance of our model, we compared our model with a model that ignores the shear thickening behavior by graphing their solutions on log-log plots. In the flow regime of near-wellbore damage, the pressure derivative computed by our model is distinctly larger than that computed by the model ignoring shear thickening behavior. Furthermore, the effect of shear thickening behavior on pressure derivative differs from that of near-wellbore damage. We then investigated the influence of shear thickening behavior on pressure derivative with different polymer injection rates, injection rates, and permeabilities. The results can provide a benchmark to better estimate near-wellbore damage in viscoelastic polymer flooding systems. Besides, we demonstrated the applicability and accuracy of our model by interpreting transient pressure data from a field case in an oilfield with viscoelastic polymer flooding treatments.

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LAOS (Large Amplitude Oscillatory Shear) Analysis for Shear-Thickening Behavior of Concentrated Slurry

Nihon Reoroji Gakkaishi ◽

10.1678/rheology.48.245 ◽

2020 ◽

Vol 48 (5) ◽

pp. 245-250

Author(s):

Masahiko Ishii ◽

Hiroshi Nakamura

Keyword(s):

Large Amplitude ◽

Shear Thickening ◽

Oscillatory Shear ◽

Large Amplitude Oscillatory Shear ◽

Thickening Behavior

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A Study of Fenton’s Oxidation Pretreatment on Dye Wastewater Containing Acetic Acid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1044-1045.215 ◽

2014 ◽

Vol 1044-1045 ◽

pp. 215-218

Author(s):

Xian Huan Qiu ◽

Hai Yu ◽

Peng Fei Deng

Keyword(s):

Acetic Acid ◽

Processing Time ◽

Ph Value ◽

Removal Rate ◽

Cod Removal ◽

Dye Wastewater ◽

Fenton’S Oxidation ◽

Effects Of Ph ◽

Cod Removal Rate ◽

Fenton's Oxidation

In the presence of acetic acid, the effects of pH, processing time, addition of Fe2+ and H2O2 on dye wastewater treatment were studied. Experimental results showed that in the presence of acetic acid, when the pH value was 4, the processing time was 30.0min, addition of ferrous sulfate was 4.8g/L, and addition of hydrogen peroxide was 56mL/L, the treatment effect was the best, COD removal rate reached 51.0%. Further studied of the effect of the presence of acetic acid on Fenton’s oxidation of dye wastewater, the results showed that without of acetic acid, the COD removal rate was higher than that with acetic acid. And the effect of Fenton's reagent on oxidation of dye substances was interfered by the presence of acetic acid.

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