Hydrophobic modified silica particle (HMSP)-stabilized cottonseed oil emulsion for oil recovery enhancement

Li, Entian; Guo, Lianghui; He, Long; Dong, Ruiqiang; Yasin, Akram; Cui, Linfang; Zhang, Yagang; Xiang, Haiyan

doi:10.1080/15567036.2018.1516009

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…The initial models were minimized with smart minimizer algorithms based on the steepest descent and conjugate gradient algorithms [18]. The dynamics simulation was completed in NVT ensemble, the simulation temperature was at 298 K with the Nose thermostat [19], and then the simulation data were outputted every 5000 steps.…”

Section: Calculation Detailsmentioning

confidence: 99%

Molecular Viewpoint for the Stability Mechanism of SiO2/SDS Dispersion

Liu

Chen

et al. 2022

Preprint

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The dispersion of silica dioxide (SiO2)/sodium lauryl sulfate (SDS) have been widely used in the oilfield development and the remaining oil displacement, but its instability is still a problem in the practical engineering application. In this paper, the mechanism of foam stability was investigated by combining the measurement of interfacial energy of nanoparticles at the gas-liquid interface with the dynamics simulation of molecular diffusion. The results showed that the addition of SiO2 nanoparticles improved the interfacial energy and interfacial activity at the gas-liquid interface, meanwhile limited the movement of SDS molecules and water molecules, which was beneficial for the foam stability. Notably, the addition of modified SiO2 nanoparticles further enhanced the interfacial energy at the gas-liquid interface and strengthened the restriction of water/SDS molecular movement, thereby slowing down the drainage and decay of the foam dispersions. The mechanism investigation was of benefit for foam flooding engineering application.

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Section: Calculation Detailsmentioning

confidence: 99%

Molecular Viewpoint for the Stability Mechanism of SiO2/SDS Dispersion

Liu

Chen

et al. 2022

Preprint

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“…Nanooxides such as fumed silica (nanosilica) are important industrial materials used in both unmodified [ 1 , 2 , 3 , 4 , 5 ] and modified functionalized [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ] states. Various silanes and siloxanes are widely used to modify silica particles [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Modified silica materials with alkyl chains are more appropriate to prepare various composites with polymers as compared with unmodified silica materials [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Chemistry of Nanohybrids with Fumed Silica Functionalized by Polydimethylsiloxane/Dimethyl Carbonate Studied Using 1H, 13C, and 29Si Solid-State NMR Spectroscopy

et al. 2021

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The investigation of molecular interactions between a silica surface and organic/inorganic polymers is crucial for deeper understanding of the dominant mechanisms of surface functionalization. In this work, attachment of various depolymerized polydimethylsiloxanes (PDMS) of different chain lengths, affected by dimethyl carbonate (DMC), to silica nanoparticles pretreated at different temperatures has been studied using 29Si, 1H, and 13C solid-state NMR spectroscopy. The results show that grafting of different modifier blends onto a preheated silica surface depends strongly on the specific surface area (SSA) linked to the silica nanoparticle size distributions affecting all textural characteristics. The pretreatment at 400 °C results in a greater degree of the modification of (i) A-150 (SSA = 150 m2/g) by PDMS-10/DMC and PDMS‑1000/DMC blends; (ii) A‑200 by PDMS-10/DMC and PDMS-100/DMC blends; and (iii) A-300 by PDMS-100/DMC and PDMS-1000/DMC blends. The spectral features observed using solid-state NMR spectroscopy suggest that the main surface products of the reactions of various depolymerized PDMS with pretreated nanosilica particles are the (CH3)3SiO-[(CH3)2SiO-]x fragments. The reactions occur with the siloxane bond breakage by DMC and replacing surface hydroxyls. Changes in the chemical shifts and line widths, as shown by solid-state NMR, provide novel information on the whole structure of functionalized nanosilica particles. This study highlights the major role of solid-state NMR spectroscopy for comprehensive characterization of functionalized solid surfaces.

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“…Hydrophobized NAS are of interest from a practical point of view because these materials are better fillers of nonpolar or weakly polar polymers as well as being more appropriate for other practical applications than hydrophilic NAS. ,− Therefore, a deeper insight into the problem of hydrophobization of various NAS by various modifiers is of importance. The morphological, textural, and structural features of various NAS can strongly affect the results of hydrophobization: the degree of hydrophobization (θ), possible length of hydrophobic functionalities, and changes in the porosity and S BET , and so forth. − Clearly, these aspects are of importance because the hydrophobization of NAS influences not only the structure of a solid surface but also other characteristics and properties of the materials. − ,− Different modifiers with low-molecular weight (MW) can be applied for the hydrophobization of NAS, such as organosilanes [(CH 3 O) x SiR 4– x ], chlorosilanes (Cl x SiR 4– x , where R = CH 3 or other organic functional groups), and hexamethyldisilazane (HMDS). − …”

Section: Introductionmentioning

confidence: 99%

Nanostructured Amorphous Silicas Hydrophobized by Various Pathways

Protsak

Гунько

Henderson³

et al. 2019

ACS Omega

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Various nanostructured amorphous silicas [fumed silicas such as crude (A-300), hydro-compacted (cA-300, TS 100), and precipitated silica Syloid 244] were modified by different polydimethylsiloxanes such as PDMS5, PDMS100, PDMS200, PDMS1000, and PDMS12500 (the label numbers show the viscosity (η) values) using dimethyl carbonate (DMC) as a siloxane-bond-breaking reagent. In addition, hexamethyldisilazane was used to modify fumed silica cA-300. The nanocomposites were characterized using microscopy, infrared spectroscopy, thermodesorption, nitrogen adsorption–desorption, solid-state NMR spectroscopy, small-angle X-ray scattering, and zeta-potential methods. It was found that the morphological, textural, and structural characteristics of silicas grafted with PDMS depend strongly not only on the type and content of the polymers used but also on the organization of nonporous nanoparticles (NPNP) in secondary structures (aggregates of NPNP and agglomerated aggregates, ANPNP), as well on the reaction temperature ( T r ). Specifically, we determined that ANPNP with a macro/mesoporous character are favorable for the effective modification of the silicas studied with short polymers and no DMC addition but at higher temperatures or for a longer silicone polymer with the presence of DMC and at lower temperatures. In particular, the PDMS/DMC-modified silicas are of great interest from a practical point of view because they remain in a dispersed state with no strong compaction of the secondary structures after modification, and this corresponds to a better distribution of the modified nanoparticles in polymeric or other matrices.

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Hydrophobic modified silica particle (HMSP)-stabilized cottonseed oil emulsion for oil recovery enhancement

Cited by 6 publications

References 30 publications

Molecular Viewpoint for the Stability Mechanism of SiO2/SDS Dispersion

Molecular Viewpoint for the Stability Mechanism of SiO2/SDS Dispersion

Surface Chemistry of Nanohybrids with Fumed Silica Functionalized by Polydimethylsiloxane/Dimethyl Carbonate Studied Using 1H, 13C, and 29Si Solid-State NMR Spectroscopy

Nanostructured Amorphous Silicas Hydrophobized by Various Pathways

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