Molecular insights on the interfacial and transport properties of supercritical CO2/brine/crude oil ternary system

Bionanocomposites based on Polylactide (PLA) and Polyhydroxybutyrate (PHB) blends were successfully obtained through a combined extrusion and impregnation process using supercritical CO2 (scCO2). Graphene oxide (GO) and cinnamaldehyde (Ci) were incorporated into the blends as nano-reinforcement and an active compound, respectively, separately, and simultaneously. From the results, cinnamaldehyde quantification values varied between 5.7% and 6.1% (w/w). When GO and Ci were incorporated, elongation percentage increased up to 16%, and, therefore, the mechanical properties were improved, with respect to neat PLA. The results indicated that the Ci diffusion through the blends and bionanocomposites was influenced by the nano-reinforcing incorporation. The disintegration capacity of the developed materials decreased with the incorporation of GO and PHB, up to 14 and 23 days of testing, respectively, without compromising the biodegradability characteristics of the final material.

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Effects of Supercritical CO2 Drying and Photoresist Strip on Low-k Films

MRS Proceedings ◽

10.1557/proc-766-e8.20 ◽

2003 ◽

Vol 766 ◽

Author(s):

R.F. Reidy ◽

Zhengping Zhang ◽

R.A. Orozco-Teran ◽

B.P. Gorman ◽

D.W. Mueller

Keyword(s):

Dielectric Constant ◽

Porous Materials ◽

Transport Properties ◽

Supercritical Co2 ◽

Polar Molecule ◽

Interlayer Dielectric ◽

Highly Porous Materials ◽

Supercritical Co2 Drying ◽

Low K ◽

Highly Porous

AbstractFuture interlayer dielectric (ILD) requirements necessitate reductions in dielectric constant to 2.1 within four years. Due to gaseous-like transport properties and near liquid-like densities, supercritical methods have been developed to dry and strip resist from these highly porous materials. Although a non-polar molecule, the solvating capability of supercritical CO2 (SCCO2) can be tailored by varying pressure, temperature, and co-solvents. This flexibility has been employed to remove photoresist and moisture from porous low-k films. The results of these experiments have been characterized using FTIR, ellipsometry, and SEM.

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Tuning the chemistry of seawater with activated clay: an application in SmartWater enrichment for enhanced oil recovery

Journal of Petroleum Exploration and Production Technology ◽

10.1007/s13202-020-00943-z ◽

2020 ◽

Vol 10 (8) ◽

pp. 3905-3916

Author(s):

Jimoh K. Adewole ◽

Taye S. Kazeem ◽

Tajudeen A. Oyehan

Keyword(s):

Crude Oil ◽

Transport Properties ◽

Enhanced Oil Recovery ◽

Oil Recovery ◽

Filter Cake ◽

Oil Reservoir ◽

Mixed Matrix ◽

Ion Rejection ◽

Filter Cakes

Abstract Studies on the interaction between crude oil, brine, and rock systems showed that the composition of water injected into the oil reservoir influences the amount of oil recovered from such a reservoir. Therefore, researchers are now emphasizing the use of SmartWater for enhanced oil recovery (EOR). In this research, the capability of activated clay to be used for tuning the chemistry of seawater for subsequent production of SmartWater was investigated. Filter cakes were formed using bentonite and its blends with raw clay and activated clay (which was produced in-house using locally obtained clay samples). The capability of the cakes to control the transport properties of permeating seawater was evaluated in terms of ion rejection. The average rejection for the raw clay cake for Na+, K+, Mg2+, and Ca2+ is 4.45, 49.64, 53.33, and 94.43%, respectively. The rejection results for the mixed-matrix cake containing the activated clay were 6.38, 51.34, 86.19, and 78.09 for Na+, K+, Mg2+, and Ca2+, respectively. It was observed that the selectivity of the filter cake for Mg2+ and Ca2+ was reversed due to the addition of the activated clay. Thus, activated clay possesses some potentials for SmartWater production for an EOR application.

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