Microscopic characteristics of Janus nanoparticles prepared via a grafting-from reaction at the immiscible liquid interface

2020 ◽  
Vol 22 (9) ◽  
pp. 5347-5354
Author(s):  
Bing-Yu Li ◽  
Li Zhao ◽  
Zhong-Yuan Lu
Keyword(s):  
Interfacial Tension ◽  
Monomer Concentration ◽  
Immiscible Liquid ◽  
Liquid Interface ◽  
Reaction Probability ◽  
Initial Monomer Concentration ◽  
Janus Nanoparticles ◽  
Initial Monomer ◽  
Grafting From

The interfacial tension, initial monomer concentration, and reaction probability can greatly influence the microscopic characteristics of the Janus nanoparticle (JNP) structure. The asymmetric initial monomer concentration in solution and the reaction probability can be used to control the syntheses of asymmetric JNPs.

scholarly journals Synthesis of cyclic polymers and flaws of the Jacobson–Stockmayer theory

2020 ◽  
Vol 11 (14) ◽  
pp. 2595-2604 ◽  
Author(s):  
Hans R. Kricheldorf ◽  
Steffen M. Weidner ◽  
Felix Scheliga
Keyword(s):  
Monomer Concentration ◽  
Polymer Chains ◽  
Cyclic Polymers ◽  
Initial Monomer Concentration ◽  
Initial Monomer

The results of this study show that even at the highest initial monomer concentration (IMC) complete cyclization of polymer chains can be achieved at 100% conversion.

scholarly journals Effect of transfer agent, temperature and initial monomer concentration on branching in poly(acrylic acid): A study by 13 C NMR spectroscopy and capillary electrophoresis

Polymer ◽  
2017 ◽  
Vol 114 ◽  
pp. 209-220 ◽  
Author(s):  
Jean-Baptiste Lena ◽  
Alexander K. Goroncy ◽  
Joel J. Thevarajah ◽  
Alison R. Maniego ◽  
Gregory T. Russell ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Nmr Spectroscopy ◽  
Acrylic Acid ◽  
Monomer Concentration ◽  
Initial Monomer Concentration ◽  
Initial Monomer ◽  
C Nmr ◽  
Poly Acrylic Acid

scholarly journals Self-Initiated Butyl Acrylate Polymerizations in Bulk and in Solution Monitored By In-Line Techniques

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2021
Author(s):  
Jonas Mätzig ◽  
Marco Drache ◽  
Sabine Beuermann
Keyword(s):  
High Temperature ◽  
Linear Regression ◽  
Monomer Concentration ◽  
Nir Spectroscopy ◽  
Polymerization Rate ◽  
Additional Parameter ◽  
Initial Monomer Concentration ◽  
Rate Of Polymerization ◽  
Initial Monomer ◽  
Kinetics Of

High-temperature acrylate polymerizations are technically relevant, but yet not fully understood. In particular the mechanism and the kinetics of the thermal self-initiation is a topic of current research. To obtain more detailed information the conversion dependence of the polymerization rate, rbr, is determined via in-line DSC and FT-NIR spectroscopy for reactions in bulk and in solution at temperatures ranging from 80 to 160 °C. Solution polymerizations revealed that dioxane is associated with the highest rbr, while aromatic solvents result in the lowest values of rbr. Interestingly, rbr for polymerizations in solution with dioxane depends on the actual monomer concentration at a given time in the system, but is not depending on the initial monomer concentration. The overall rate of polymerization in bulk and in solution is well represented by an equation with three or four parameters, respectively, being estimated by multiple linear regression and the temperature as additional parameter.

scholarly journals Mechanism of active silica nanofluids based on interface-regulated effect during spontaneous imbibition

2021 ◽  
Author(s):  
Xu-Guang Song ◽  
Ming-Wei Zhao ◽  
Cai-Li Dai ◽  
Xin-Ke Wang ◽  
Wen-Jiao Lv
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Oil Recovery ◽  
Dynamic Contact Angle ◽  
Liquid Interface ◽  
Spontaneous Imbibition ◽  
Wettability Alteration ◽  
Low Permeability ◽  
Oil Water ◽  
Solid Liquid

AbstractThe ultra-low permeability reservoir is regarded as an important energy source for oil and gas resource development and is attracting more and more attention. In this work, the active silica nanofluids were prepared by modified active silica nanoparticles and surfactant BSSB-12. The dispersion stability tests showed that the hydraulic radius of nanofluids was 58.59 nm and the zeta potential was − 48.39 mV. The active nanofluids can simultaneously regulate liquid–liquid interface and solid–liquid interface. The nanofluids can reduce the oil/water interfacial tension (IFT) from 23.5 to 6.7 mN/m, and the oil/water/solid contact angle was altered from 42° to 145°. The spontaneous imbibition tests showed that the oil recovery of 0.1 wt% active nanofluids was 20.5% and 8.5% higher than that of 3 wt% NaCl solution and 0.1 wt% BSSB-12 solution. Finally, the effects of nanofluids on dynamic contact angle, dynamic interfacial tension and moduli were studied from the adsorption behavior of nanofluids at solid–liquid and liquid–liquid interface. The oil detaching and transporting are completed by synergistic effect of wettability alteration and interfacial tension reduction. The findings of this study can help in better understanding of active nanofluids for EOR in ultra-low permeability reservoirs.

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