Adsorption

Rao, Shuiqin

doi:10.1016/b978-0-12-801970-2.00005-7

Cited by 8 publications

(4 citation statements)

References 234 publications

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“…The increase in fiber diameter suggests that both coating methods are effective to modify the PBI surface. The dip coated samples exhibit a slightly higher diameter than for the spin coating ones, which reflects the adsorption of more material on the fibers surface, in agreement with previously reported studies [33].…”

Section: Morphological Characterization Of Electrospun Scaffoldssupporting

confidence: 92%

PEDOT:PSS-Coated Polybenzimidazole Electroconductive Nanofibers for Biomedical Applications

et al. 2021

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Bioelectricity drives several processes in the human body. The development of new materials that can deliver electrical stimuli is gaining increasing attention in the field of tissue engineering. In this work, novel, highly electrically conductive nanofibers made of poly [2,2′-m-(phenylene)-5,5′-bibenzimidazole] (PBI) have been manufactured by electrospinning and then coated with cross-linked poly (3,4-ethylenedioxythiophene) doped with poly (styrene sulfonic acid) (PEDOT:PSS) by spin coating or dip coating. These scaffolds have been characterized by scanning electron microscopy (SEM) imaging and attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy. The electrical conductivity was measured by the four-probe method at values of 28.3 S·m−1 for spin coated fibers and 147 S·m−1 for dip coated samples, which correspond, respectively, to an increase of about 105 and 106 times in relation to the electrical conductivity of PBI fibers. Human bone marrow-derived mesenchymal stromal cells (hBM-MSCs) cultured on the produced scaffolds for one week showed high viability, typical morphology and proliferative capacity, as demonstrated by calcein fluorescence staining, 4′,6-diamidino-2-phenylindole (DAPI)/Phalloidin staining and MTT [3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyl tetrazolium bromide] assay. Therefore, all fiber samples demonstrated biocompatibility. Overall, our findings highlight the great potential of PEDOT:PSS-coated PBI electrospun scaffolds for a wide variety of biomedical applications, including their use as reliable in vitro models to study pathologies and the development of strategies for the regeneration of electroactive tissues or in the design of new electrodes for in vivo electrical stimulation protocols.

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Section: Morphological Characterization Of Electrospun Scaffoldssupporting

confidence: 92%

PEDOT:PSS-Coated Polybenzimidazole Electroconductive Nanofibers for Biomedical Applications

et al. 2021

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“…The 1 min Mg 2+ adsorption trend is attributed to the maximum population of Mg 2+ ions that could be absorbed onto the surface of Li-SQCOF. The slowing and subsequent plateauing of Mg 2+ adsorption were attributed to the decreased availability of surface sites . The adsorption of Mg 2+ on the SQCOF and Li-SQCOF surfaces followed the pseudo-second-order (PSO) kinetic model by following eq () …”

Section: Resultsmentioning

confidence: 99%

“…The slowing and subsequent plateauing of Mg 2+ adsorption were attributed to the decreased availability of surface sites. 48 The adsorption of Mg 2+ on the SQCOF and Li-SQCOF surfaces followed the pseudo-second-order (PSO) kinetic model by following eq (3). 49 t q kq t q…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Lithium Pyrene Squarate Covalent Organic Frameworks for Efficient Lithium and Magnesium Separation from Salt Water

Altaf

Khosropour

Zadehnazari

et al. 2023

ACS Appl. Mater. Interfaces

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The increasing pressure for lithium resources from the electric vehicle and nuclear energy industries means that new technologies to separate Mg2+ from Li+ from salt water are in demand. To address this need, we fabricated lithium pyrene squarate covalent organic frameworks (Li-SQCOFs) to separate Mg2+/Li+ mixtures from salt water. We optimized the effect of the electrolyte and the amount of the adsorbent and then carried out a kinetics study on the adsorbent recovery at various pH levels using both batch and continuous flow adsorption methods. Li-SQCOF was found to have excellent selectivity for solutions containing a mixture of Mg2+/Li+ ions. This work represents a unique path for the separation of Mg2+/Li+ through direct adsorption using a covalent organic framework (COF). The COF-supported ultrafiltration bed made in this study gave a Mg2+ separation flux of 60.5 h–1 m–2.

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“…The conformation of the adsorbing layers and the previously adsorbed layer determine the bilayer thickness of the films [ 37 ]. Table 2 summarizes the thickness of the prepared films at various pH of PAA and MPC.…”

Section: Resultsmentioning

confidence: 99%

pH Tunable Thin Film Gradients of Magnetic Polymer Colloids for MRI Diagnostics

Khizar

Ahmad

2020

Polymers

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Magnetic polymer colloids comprising of magnetite (Fe3O4) nanoparticles and Eudragit E100 were employed to fabricate thin film gradients and were investigated for in-vitro magnetic resonance imaging. Magnetic polymer colloids (MPC) and polyacrylic acid (PAA) with stimuli-responsive cationic and anionic functional groups respectively facilitate the formation of thin film gradients via layer by layer technique. The characteristics of films were controlled by changing the pH and level of the adsorbing solutions that lead to the development of gradient films having 5.5, 10.5 and 15.5 bilayers. Optical microscopy, scanning electron microscopy and magnetic force microscopy was carried out to determine the surface coverage of films. Surface wettability demonstrated the hydrophilicity of adsorbed colloids. The developed thin-film gradients were explored for in vitro magnetic resonance imaging that offers a point of care lab-on-chip as a dip-stick approach for ultrasensitive in-vitro molecular diagnosis of biological fluids.

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Adsorption

Cited by 8 publications

References 234 publications

PEDOT:PSS-Coated Polybenzimidazole Electroconductive Nanofibers for Biomedical Applications

PEDOT:PSS-Coated Polybenzimidazole Electroconductive Nanofibers for Biomedical Applications

Lithium Pyrene Squarate Covalent Organic Frameworks for Efficient Lithium and Magnesium Separation from Salt Water

pH Tunable Thin Film Gradients of Magnetic Polymer Colloids for MRI Diagnostics

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