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Stability of Nanomaterials
Published in Yasser Shahzad, Syed A.A. Rizvi, Abid Mehmood Yousaf, Talib Hussain, Drug Delivery Using Nanomaterials, 2022
Mulham Alfatama, Ahmed R. Gardouh, Abd Almonem Doolaane
Thermal conductivity in water dispersion was 1.4-fold higher in iron oxide rod-shape nanoparticles prepared via co-precipitation through sodium dodecylbenzenesulfonate (SDBS) as a surfactant (Gayadhthri et al. 2014). Carbon nanotube-based nanofluids showed better stability when surfactant was incorporated compared to surfactant-free formulation. The presence of hexadecyltrimethylammonium bromide has associated with the highest zeta potential value, whereas highest thermal conductivity (25.7%) was attained with gum Arabic as a surfactant (Leong et al. 2016). Similarly, Cu-H2O nanofluids synthesized by two-step approach exhibited enhanced thermal conductivity and improved dispersion behavior via optimization the SDBS levels (Zhu et al. 2009). Also, the stability of TiO2 nanosuspensions was preserved even after a period of 7 days in the base fluid with the aid of surfactant (Aziz, Khalid, and Khalid 2018). Moreover, the stability of Ag-silicon oil nanofluid and carbon black-water was enabled by utilizing different types of surfactants, such as SDS or oleic acid (Aziz, Khalid, and Khalid 2018). Introducing of the surfactant in various nanofluid preparations facilitates homogenous dispersion of the nanoparticles in the base fluid as a result of electrostatic repulsion (F. Yu et al. 2017).
Synthesis of Nanomaterials Using Biosurfactants
Published in Mahendra Rai, Patrycja Golińska, Microbial Nanotechnology, 2020
Paulo Ricardo Franco Marcelino, Fernanda Gonçalves Barbosa, Mariete Barbosa Moreira, Talita Martins Lacerda, Silvio Silvério da Silva
Aiming to obtain high performance surfactant and emulsifier blends for industrial applications, Onaizi et al. (2012) combined surfactin with the synthetic surfactant sodium dodecylbenzenesulfonate (SDOBS). The adsorption of the surfactant mixture from the liquid phase into the air‒liquid interface resulted in the formation of a mixed interfacial monolayer with a mole fraction of the biosurfactant at 0.55, although its mole fraction in the liquid bulk was much lower (0.076). The formation of a mixed interfacial monolayer comprising SDOBS and surfactant was found to be a spontaneous process (ΔG = –2.42 kJ/mol). This result shows the potential application of this mixture in industrial processes. The use of a biosurfactant‒synthetic surfactant mixture has the advantage of reducing the use of a surfactant derived from petroleum, making the process or product eco-friendly and sustainable.
Carbon Nanomaterials for Tribological Applications
Published in Kun Zhou, Carbon Nanomaterials, 2020
In polymer-based bulk materials, a critical role of CNTs for mechanical, friction, and wear properties of polymers is dispersivity. The effect of the interface area and enhancement ability were increased with decreasing free-space length, Lf [95]. An effective method to uniformly disperse CNTs in the polymer matrix is the combination of ultrasonic treatment in aqueous media with a suitable surfactant such as cholesterol-end-capped poly(2-methacryloyloxyethyl phosphorylcholine), polyoxyethylene octyl phenyl ether, sodium dodecyl sulfate, lithium dodecyl sulfate, and sodium dodecylbenzenesulfonate. Table 6.2 provides the wear and friction behaviors of polymeric materials enhanced by well-dispersed CNTs. Ultralow COF originated from the limitation of wear plowing or cutting during the friction process. In addition to randomly dispersed CNTs in polymer matrix, other two dispersion types involving well and oriented dispersion of CNTs in epoxy were fabricated. A remarkable decrease in wear by three orders of magnitude in epoxy was reported for the wear process along the normal orientation [96]. This was the first systematic work to evaluate the anti-wear performance of aligned MWCNTs in epoxy bulk materials.
Relative permeability measurement in carbonate rocks, the effects of conventional surfactants vs. Ionic liquid-based surfactants
Published in Journal of Dispersion Science and Technology, 2020
Samyar Zabihi, Davood Faraji, Yaghoub Rahnama, Ali Zeinolabedini Hezave, Shahab Ayatollahi
In the present study, sodium dodecylbenzenesulfonate (SDBS) as a sample surfactant with purity of 99%, molar mass of 348.48 and chemical formula of C18H29NaO3S was supplied from ACROS, USA and utilized without any further purification. In addition, the required ILs including [C18mim] [Cl], [C12mim] [Cl], [C8mim] [Cl], [C12Py] [Cl] and [C8Py] [Cl] were synthesized using 1-methylimidazole, 1-chlorododecyl, 1-chlorooctane, pyridine and diethyl ether (Merck/Fluka, purity > 99%). A brief description of the used method for synthesizing is previously reported by the coauthors.[34,35] After synthesizing, the accuracy of the used synthesis method was examined using HNMR and FTIR for [C18mim] [Cl] and [C12mim] [Cl] as given in Figures 2 and 3. In addition, the FTIR of the synthesized [C18mim] [Cl], [C12mim] [Cl] are compared with those synthesized by Bennet et al.[36] to reliably check if the mentioned synthesized method was accurate or not.
Rheology of novel self-thickening cationic gemini surfactant solutions
Published in Journal of Dispersion Science and Technology, 2018
Liangyuan Wang, Bo Fang, Mo Yang
The morphology of surfactant micelles has been widely researched in recent years. Han[13] found that micelles of sodium erucate (NaOEr), a C22-tailed anionic surfactant with a monounsaturated tail, in the presence of a tetraalkylammonium hydrotrope were verified as vesicles by cryo-TEM observations. Chu et al.[14] investigated micelles formed by a C22-tailed amidosulfobetaine surfactant, 3-(Nerucamidopropyl-N,N-dimethyl ammonium) propane sulfonate (EDAS). The surfactants they obtained possess a net structure, which has been verified by cryo-TEM observations. Gene molecules can be individually compacted by cationic thiol detergents into nanometric particles that are stabilized by oxidative conversion of the detergent into a Gemini surfactant.[151617] Hollow polymer spheres of styrene and divinyl benzene can be templated from surfactant vesicles formed by cetyltrimethylammonium tosylate (CTAT) and sodium dodecylbenzenesulfonate (SDBS) or cetyltrimethylammonium bromide (CTAB) and sodium octyl sulfate (SOS).[18] Ionic liquids formed by zwitterionic surfactants can be used as new reaction mediums.[19,20]
A synergistic anti-corrosion effect of longan residue extract and sodium dodecylbenzenesulfonate composition on AZ91D magnesium alloy in NaCl solution
Published in Corrosion Engineering, Science and Technology, 2022
Yafeng Qian, Yaxu Wu, Xugeng Guo, Li Wang
Involvement of the organic corrosion inhibitor is a popular and efficient strategy to improve the anti-corrosion performance. The cooperation of two corrosion inhibitors could result in the better anti-corrosion performance than any of the isolate one. For example, Tavakoli et al. used sodium dodecylbenzenesulfonate and 2-mercaptobenzooxazole as composite inhibitors for the corrosion of copper in sulphuric acid solution [25]. Gao et al. reported the use of sodium dodecylbenzenesulfonate and 8-hydroxyquinoline as composite corrosion inhibitors for AZ91D Mg alloy in ASTM 01384-87 corrosive medium [26]. The benzene ring and existence of S atom in sodium dodecylbenzenesulfonate are the insurance to obtain the expected anti-corrosion performance.