A New Route for Preparation of Hydrophobic Silica Nanoparticles Using a Mixture of Poly(dimethylsiloxane) and Diethyl Carbonate

Protsak, Iryna; Pakhlov, E.M.; Tertykh, V. A.; Le, Zichun; Dong, Wen

doi:10.3390/polym10020116

Cited by 28 publications

(17 citation statements)

References 36 publications

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“…Figure 6 shows the effect of temperature on the NFs viscosity ramped from 30 to 100 °C. From the figure, it can be seen that both the NFs exhibited higher viscosity than the free-MFomax at ambient and higher temperatures; this shows that NPs loading could improve the viscosity of the MFomax because of NPs thermophysical properties (Protsak et al 2018;Xu et al 2015). However, the NF viscosity containing SiO 2 -KH550 NPs is higher than unfunctionalized SiO 2 .…”

Section: Particle Aggregation In the Nfmentioning

confidence: 93%

Nano-fluid viscosity screening and study of in situ foam pressure buildup at high-temperature high-pressure conditions

Hamza

Soleimani

Merican

et al. 2019

J Petrol Explor Prod Technol

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In this study, an industrial-based surfactant known as MFomax surfactant has been modified with unfunctionalized and silanefunctionalized silica nanoparticles (NPs) to select the high viscous nano-fluid (NF) for generation of in situ foam to assess the differential pressure buildup (∆p) behavior in the porous media. Different weight concentrations of NPs and MFomax from 0.1 to 0.5% were studied using Design Expert Software to generate full matrix design of NF formulations. The viscosity data were analyzed with the aid of response surface analytical tool to investigate the response of NPs loading on the NF viscosity for optimization. The microstructural properties of the NFs were characterized using spectroscopic equipment. Subsequently, the high viscous NF was selected to generate in situ foam in comparison with the precursor MFomax foam for ∆p buildup assessment at 110 °C and 2023 psi in the native reservoir core. Results have shown that both the silica NPs could significantly improve the MFomax viscosity; however, the silane-functionalized silica NPs have more effect to improve the viscosity and other microstructural properties than the unfunctionalized NPs, and thus, they were selected for further experimental studies. The coreflood ∆p buildup assessment shows that NF foam built more ∆p having average value of 46 psi against 25 psi observed in the case of the precursor MFomax foam. Thus, this study demonstrates that functionalized silica NPs could improve the MFomax viscosity and eventually generates high ∆p buildup at high-temperature high-pressure conditions.

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Section: Particle Aggregation In the Nfmentioning

confidence: 93%

Nano-fluid viscosity screening and study of in situ foam pressure buildup at high-temperature high-pressure conditions

Hamza

Soleimani

Merican

et al. 2019

J Petrol Explor Prod Technol

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“…While Henry’s mode type sorbed water can be removed relatively easily due to weak interaction (physisorption) between water and material, water sorbed on materials due to Langmuir type interaction (chemisorption on filler) is more likely to create long term outgassing problems in many systems with moisture sensitive units as this is harder to remove from the surface. Thus, surface treatment (for example, hydrophobic functionalization of silica filler surface to remove active -OH surface group 41 ) of filler materials can be implemented to reduce such interactions.…”

Section: Discussionmentioning

confidence: 99%

Role of filler and its heterostructure on moisture sorption mechanisms in polyimide films

Sharma

Kroonblawd

Sun

et al. 2018

Sci Rep

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Moisture sorption and diffusion exacerbate hygrothermal aging and can significantly alter the chemical and mechanical properties of polymeric-based components over time. In this study, we employ a multi-pronged multi-scale approach to model and understand moisture diffusion and sorption processes in polyimide polymers. A reactive transport model with triple-mode sorption (i.e., Henry’s, Langmuir, and pooling), experiments, and first principles atomistic computations were combined to synergistically explore representative systems of Kapton H and Kapton HN polymers. We find that the CaHPO4 processing aid used in Kapton HN increases the total moisture uptake (~0.5 wt%) relative to Kapton H. Henry’s mode is found to play a major role in moisture uptake for both materials, accounting for >90% contribution to total uptake.However, the pooling mode uptake in Kapton HN was ~5 times higher than in Kapton H. First principles thermodynamics calculations based on density functional theory predict that water molecules chemisorb (with binding energy ~17–25 kcal/mol) on CaHPO4 crystal surfaces. We identify significant anisotropy in surface binding affinity, suggesting a possible route to tune and mitigate moisture uptake in Kapton-based systems through controlled crystal growth favoring exposure of CaHPO4 (101) surfaces during manufacturing.

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“…Figures 18-21. shows the existence of irregular surface roughness. This roughness and height up diameters of the nanocomposite, can be attributed to linkage of different synthesized chains of heterocyclic thiadiazole polymers, with surface of grafting silica to formation nanocomposite [21]. It is strongly dependent on the growing conditions and the surface processing methodologies [22].…”

Section: Atomic Forces Microscopy Of Nanocomposites (Afm)mentioning

confidence: 99%

New Nanocomposite Derivatives From Thiadiazole Polymers /Silica Synthesis and Characterization using Free Radical Polymerization

Abid

Sultan²,

Tomma³

2019

IHJPAS

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A new class of thiadiazole /silica nanocomposites with chemical bonds between thiadiazole monomers and modified nanosilica surface were synthesized by free radical polymerization. Presence silica nanoparticles in the structure of nanocomposite showed effectively improve the physical and chemical properties of Producing polymers. A nanocomposite material with feature properties comparison with their polymers, The structure and morphology of the synthesis materials were investigated by FT-IR spectrum which display preparation new thiadiazole compounds and polymerization monomers. FT-IR showed disappeared double bond (C=C) of monomers, due to produce long chains of thiadiazole polymers and nanocomposite. X-ray diffraction gave idea about crystalline structure of nanoparticles and nanocomposite , X-ray showed that silica nanoparticles have high intensity at 18000 , due to nanoscale of particles which allowed for particles aggregation together. While nanocomposite show low intensity due to reacted thiadaizole polymer chains with silica nanoparticles surface. The distribution of nanoparticles had characterized by Atomic forces microscopy AFM. AFM results shown roughness in the surfaces of nanocomposites C1 and C2, comparison with silica nanoparticles which gave smooth surface. The roughness attributed to reaction between functionalized surface of silica nanoparticles and chains of thiadaizole polymers, which led to change in size particles distribution and surface of particles that refer to nanocomposite.

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A New Route for Preparation of Hydrophobic Silica Nanoparticles Using a Mixture of Poly(dimethylsiloxane) and Diethyl Carbonate

Cited by 28 publications

References 36 publications

Nano-fluid viscosity screening and study of in situ foam pressure buildup at high-temperature high-pressure conditions

Nano-fluid viscosity screening and study of in situ foam pressure buildup at high-temperature high-pressure conditions

Role of filler and its heterostructure on moisture sorption mechanisms in polyimide films

New Nanocomposite Derivatives From Thiadiazole Polymers /Silica Synthesis and Characterization using Free Radical Polymerization

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