Towards Novel Multifunctional Pillared Nanostructures: Effective Intercalation of Adamantylamine in Graphene Oxide and Smectite Clays

Abstract

Multifunctional pillared materials are synthesized by the intercalation of cage‐shaped adamantylamine (ADMA) molecules into the interlayer space of graphite oxide (GO) and aluminosilicate clays. The physicochemical and structural properties of these hybrids, determined by X‐ray diffraction (XRD), Fourier transform infrared (FTIR), Raman and X‐ray photoemission (XPS) spectroscopies and transmission electron microscopy (TEM) show that they can serve as tunable hydrophobic/hydrophilic and stereospecific nanotemplates. Thus, in ADMA‐pillared clay hybrids, the phyllomorphous clay provides a hydrophilic nanoenvironment where the local hydrophobicity is modulated by the presence of ADMA moieties. On the other hand, in the ADMA‐GO hybrid, both the aromatic rings of GO sheets and the ADMA molecules define a hydrophobic nanoenvironment where sp3‐oxo moieties (epoxy, hydroxyl and carboxyl groups), present on GO, modulate hydrophilicity. As test applications, these pillared nanostructures are capable of selective/stereospecific trapping of small chlorophenols or can act as cytotoxic agents.

Electrostatic self-assembled graphene oxide-collagen scaffolds towards a three-dimensional microenvironment for biomimetic applications

“…34 After the self-assembly process with GO, an additional peak appeared at 401.5 eV, which is attributed to the ionic bonds between the protonated amine groups from collagen and the anionic carboxylic groups from GO. 35 This result confirms the electrostatic nature of the bonds between GO sheets and collagen molecules. In order to better understand the nature of the GO and collagen interactions that prompts de formation of the hydrogel, several GO and collagen solutions were prepared at different medium pH values (see Figure 2a-b).…”

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

“…The thickness of the DODA monolayer can vary depending on the tilting angle that the molecules adopt in the film [51,52] and can reach 25 Å. The thickness of a clay platelet is 9.6 Å [53]. As to the dimensions of POSS, when the flexible side chains take a horizontal orientation, the POSS layer is at least 5 Å thick, [35,54] while it accounts for a thickness of 17-17.6 Å [54] when the side chains take a vertical orientation as indicated in Scheme 2.…”

Synthesis of Highly Reduced Graphene Oxide for Supercapacitor

“…If this graphene is squeezed in right direction, it might partly form multilayer graphene or graphite. Some modified graphene types have wider average interlayer space compared to RGO [23][24][25]. Graphene sheets, with surface modification or functional group, can be squeezed; they can withstand external forces.…”