Preparation and Interfacial Properties of Ultralow Concentrations of Amphiphilic Molybdenum Disulfide Nanosheets

Abstract

Amphiphilic nanosheets have gained great attraction in diverse applications owing to their unprecedented performance. In this paper, amphiphilic molybdenum disulfide (CTAB−MoS 2 ) nanosheets were prepared through a one-step simple hydrothermal method, and the physicochemical properties were systematically investigated. The results showed that the CTAB−MoS 2 nanosheets displayed a distinct ultrathin flakelike structure and a lateral size in the range of 95 nm. More specifically, the presence of defect sites over the surfaces of MoS 2 nanosheets facilitated linkage with CTAB molecules, which made MoS 2 amphiphilic. Because of the amphiphilic nature, the CTAB− MoS 2 nanosheets could be steadily dispersed in water phase, reduce the oil−water interfacial tension, alter wettability of the solid surface, and stabilize emulsions at ultralow concentrations (50 mg/L). By observing and analyzing the interfacial behavior of CTAB−MoS 2 nanosheets in a simulated oil/brine system, it was found that CTAB−MoS 2 nanosheets could be adsorbed at the oil− water interface in the form of multilayer adsorption, and the adsorption layer (oil−water interfacial film) exhibited higher strength elasticity. This work provides a scalable method for preparing amphiphilic nanosheets and reveals the physicochemical properties of CTAB−MoS 2 amphiphilic nanosheets.

Metal-organic framework enables ultraselective polyamide membrane for desalination and water reuse

“…Amphiphilic nanoflakes with highly asymmetric surface wettability ( 29 , 30 ) have garnered considerable attention in drug delivery ( 31 ), catalysis ( 32 ), and oil recovery ( 33 ). Inspired by their great potential in interfacial properties regulation ( 34 ), here, we develop an ultraselective PA RO membrane by enhancing the IP process at the interface to create a crumpled, free-standing, and ultrathin nanofilm with an intrinsic thickness (δ int ) of ~5 nm and a high cross-linking degree of ~98%. The amphiphilic metal-organic framework (MOF) nanoflakes self-assemble at the water/hexane interface and regulate the heat dissipation and the interfacial transport of MPD monomers during IP ( Fig.…”

Environmental Decontamination Using Transition Metal Dichalcogenides Based Materials: A Review

“…Another exceptional superhydrophobic/superoleophilic wettable polyurethane-loaded MoS2 nanosheets were prepared by Yu et al (2020) to allow the separation of oil/water mixtures and eliminate selectively oil from underwater or emulsion. Additionally, Qu et al (2020) experimentally confirmed that amphiphilic molybdenum disulfide nanosheets could be adsorbed at the oil−water interface in the form of multilayer adsorption to form a higher strength interfacial film, which may provide a new way for its fundamental studies and practical applications (Figure 10).…”

Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

“…The interfacial tension (IFT) between crude oil and various ultralow concentrations of nanofluids was measured via the spinning drop method on an SVT 20 N spinning drop video tensiometer supplied by DataPhysics Instruments, as reported in our previously published literature. 35 The special borosilicate glass capillary tube (inner diameter ∼4.0 mm) was saturated with the prepared nanofluids. Subsequently, 2 μL of crude oil was injected into the water phase center by using a microsyringe.…”

“…The results demonstrated that the functionalized silica nanofluid can significantly enhance oil recovery. Various literature studies − have found that amphiphilic nanosheets have a higher interfacial activity level than homogeneous nanoparticles do. A type of graphene-based amphiphilic nanosheet for EOR was proposed .…”