Tunable charge/size selective ion sieving with ultrahigh water permeance through laminar graphene membranes

Controlling the flake size of bifunctional 2D WSe2 nanosheets as flexible binders and supercapacitor materials

“…There is excellent agreement with the lateral size obtained through the DLS analysis, and the results are in accord with previous reports on graphene and MoS 2 exfoliation. [20][21][22]28 Note that the SEM image of the bulk material is shown in Fig. 2f.…”

“…Size selected WSe 2 nanosheets were prepared through liquid phase exfoliation of bulk WSe 2 following centrifugation as used in previous procedures. [19][20][21] Firstly, 2.0 g of bulk WSe 2 powder (99%, Sigma-Aldrich) was added into a 200 ml mixture of 1 : 1 v/ v water : n-propanol (IPA). The suspension was then sonicated at 37 kHz using a power of 80 mW for 12 h. Secondly, the ake size of the exfoliated WSe 2 was then nely selected by the centrifugal processes as seen in Fig.…”

Long-range selective transport of anions and cations in graphene oxide membranes, causing selective crystallization on the macroscale

“…22 Such electrically driven ion transport can be achieved with simple, cheap setups and even used to create uni-directional ion pumps not only in GOMs 23 but also in other layered materials such as V 2 O 5 . 24 Most published studies on electric-eld assisted ion transport focus on simple ions like K + and H + ; ion transport through GO-based membranes under the inuence of an applied potential has been studied previously by Hong et al, 25 and further studies with MoS 2 membranes have been conducted by Hirunpinyopas et al 26,27 The predominant transport mechanism has been attributed to the electrostatic attraction between the cations in solution and the negatively charged membrane channels, with atomic radii only affecting the transport above the critical channel width. 28 In this work, we used electric elds to study the transport of different ions in GOMs between two vials connected through a mesoscopic GOM (Fig.…”

Ion Selective Nanochannels: From Critical Principles to Sensing and Biosensing Applications

“…[41] Such promising out comes encouraged scientists to use nanochannels as single molecule sensing devices with solidstate microfabrication methods. [42][43][44] Longer nanochannel arrays were applied as effi cient compounds in other applications such as filters for sepa rating molecules, [45] proton exchange membrane systems in fuel cells, [46] templates for synthesizing nanowires, [41,47,48] supercapac itor electrodes, and membranes for electroosmotic pumps. [49]…”

“…[28] Multiple studies are available that have investigated the effect of physical parameters like size, shape, density, and chemical factors, including host−guest recognition, charge, wettability, and different interactions on the ionselec tive transportation phenomena of the nanochannels. [189][190][191][192][193] An overview of major recent works related to these factors' critical roles in improving selectivity behavior is provided in the next sections.…”