Microfluidics based particle sorting and separation methods are gaining momentum to be applied for various applications. Deterministic lateral displacement (DLD) methods are prominent for high resolution in separation and there has been extensive studies to develop more efficient devices based on the DLD. However, it is still challenging to fully eliminate negative effects of the boundaries that degrade particle separation efficiency by perturbing the fluid flow in the channel. In this article, we present two equations to optimize channels' geometry near the boundaries. Implementing the equations, the fluid behavior is improved around the pillars and thereby, separation efficiency is increased. The Boundary Correction Paradigm (BCP) enhances the microchannel's functionality as much as 2-3 times and can be highly beneficial in microchannels. Also, an equation is proposed in order to recalibrate the BCP in microchannels with desired pillar diameters. The calibration equation assures high accuracy and resolution of the DLD devices corrected with the BCP.
Sensing ultra-low levels of toxic chemicals such as H 2 S is crucial for many technological applications. In this report, employing density functional theory (DFT) calculations, we shed light on the underlying physical phenomena involved in the adsorption and sensing of the H 2 S molecule on both pristine and strained single-layer molybdenum disulfide (SL-MoS 2 ) substrates. We demonstrate that the H 2 S molecule is physisorbed on SL-MoS 2 for all values of strain, i.e. from À8% to +8%, with a modest electron transfer, ranging from 0.023e À to 0.062e À , from the molecule to the SL-MoS 2 . According to our calculations, the electron-donating behaviour of the H 2 S molecule is halved under compressive strains. Moreover, we calculate the optical properties upon H 2 S adsorption and reveal the electron energy loss (EEL) spectra for various concentrations of the H 2 S molecule which may serve as potential probes for detecting H 2 S molecules in prospective sensing applications based on SL-MoS 2 . † Electronic supplementary information (ESI) available: The zero-crossing energies in the real part of dielectric function (3 1 ) spectra for pristine and H 2 S adsorbed SL-MoS 2 under different strains and concentrations of gas molecules. In addition, coordinates of the rst ten peaks in the EEL spectra are given for different strains and concentrations of H 2 S molecules on the SL-MoS 2 . See Fig. 10 The imaginary (3 2 ) part of the dielectric function for pristine and H 2 S adsorbed SL-MoS 2 for (a) À8 percent to (h) +8 percent strained substrates with 2-percent intervals. Moreover, the influence of concentration is also shown.This journal is Fig. 11 Electron energy loss (EEL) spectra for the adsorption of up to four H 2 S molecules in the supercell of SL-MoS 2 for in-plane light polarization under the application of biaxial strains from (a) À8% to (h) +8% with 2-percent intervals. 3460 | Nanoscale Adv., 2019, 1, 3452-3462 This journal is
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