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463 results on '"Baig, Umair"'

29. Pulsed laser-assisted synthesis of nano nickel(ii) oxide-anchored graphitic carbon nitride: Characterizations and their potential antibacterial/anti-biofilm applications

Author

Baig Umair, AbuMousa Rasha A., Ansari Mohammad Azam, Gondal Muhammad A., and Dastageer Mohamed A.

Subjects
nanostructured material, nanosecond pulsed laser, characterizations, antibacterial activity, anti-biofilm activity., Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

Nickel(ii) oxide-graphitic carbon nitride (n-NiO@g-C3N4) nanocomposite, in which nickel oxide nanoparticles (n-NiO) are anchored on the polymeric surface of graphitic carbon nitride (g-C3N4), was synthesized using the pulsed laser post processing (PLPP) in liquid medium. In the PLPP method, the precursors (NiO and g-C3N4) were simultaneously subjected to pulsed laser-induced fragmentation, and pulsed laser-induced defect engineering (anchoring of NiO on g-C3N4). To optimize the functionality of the material, n-NiO@g-C3N4 with four different mass contents of n-NiO was synthesized. The synthesized n-NiO@g-C3N4 nanocomposite and its composite partners (n-NiO and g-C3N4) were structurally, morphologically, elementally characterized by X-ray diffraction, filed emission scanning electron microscope, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analyses. As a first anti-microbial application, n-NiO@g-C3N4 was used to evaluate the minimal inhibitory concentration and minimal bactericidal concentration against the gram-positive Staphylococcus aureus and gram-negative Pseudomonas aeruginosa bacteria. As a second anti-microbial application, the efficacy of n-NiO@g-C3N4 nanocomposite to retard S. aureus and P. aeruginosa biofilms’ growth was evaluated. It was found that for both applications, n-NiO@g-C3N4 nanocomposite exhibited an excellent anti-bacterial activity compared to pure g-C3N4.

Published
2022
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40. Effect of Simulation-based Training on Surgical Proficiency and Patient Outcomes: A Randomised Controlled Clinical and Educational Trial

Author

Baig, Umair, Aya, Haleema, Husnain Iqbal, Mohammed, Kum, Francesca, Bultitude, Matthew, Glass, Jonathan, Khan, Azhar, Makanjuola, Jonathan, McCabe, John E., Samsuddin, Azi, McIlhenny, Craig, Brewin, James, Kulkarni, Shashank, Khwaja, Sikandar, Islam, Waliul, Marsh, Howard, Bhat, Taher, Thomas, Benjamin, Cutress, Mark, Housami, Fadi, Nedas, Timothy, Bates, Timothy, Mukherjee, Rono, Graham, Stuart, Bordenave, Matthieu, Coker, Charles, Ahmed, Shwan, Symes, Andrew, Calvert, Robert, Lynch, Ciaran, Long, Ronan, Patterson, Jacob M., Rukin, Nicholas J., Khan, Shahid A., Dasgupta, Ranan, Brown, Stephen, Grey, Ben, Mahmalji, Waseem, Lam, Wayne, Scheitlin, Walter, Saelzler, Norbert, Fiedler, Marcel, Ishikawa, Shuhei, Sasaki, Yoshihiro, Sazawa, Ataru, Shinno, Yuichiro, Mochizuki, Tango, Peter Jessen, Jan, Steiner, Roland, Wendt-Nordahl, Gunnar, Atassi, Nabil, Kohns, Heiko, Cox, Ashley, Rendon, Ricardo, Lawen, Joseph, Bailly, Greg, Marsh, Trevor, Aydın, Abdullatif, Ahmed, Kamran, Abe, Takashige, Raison, Nicholas, Van Hemelrijck, Mieke, Garmo, Hans, Ahmed, Hashim U., Mukhtar, Furhan, Al-Jabir, Ahmed, Brunckhorst, Oliver, Shinohara, Nobuo, Zhu, Wei, Zeng, Guohua, Sfakianos, John P., Gupta, Mantu, Tewari, Ashutosh, Gözen, Ali Serdar, Rassweiler, Jens, Skolarikos, Andreas, Kunit, Thomas, Knoll, Thomas, Moltzahn, Felix, Thalmann, George N., Lantz Powers, Andrea G., Chew, Ben H., Sarica, Kemal, Shamim Khan, Muhammad, and Dasgupta, Prokar

Published
2022
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47. Recent Advancements in Metal‐Organic Framework‐Based Membranes for Hydrogen Separation: A Review.

Author

Baig, Umair, Waheed, Abdul, and Jillani, Shehzada Muhammad Sajid

Abstract

Metal‐organic frameworks (MOFs) are promising porous materials that have huge potential for gas separation when put in the membrane configuration. MOFs have huge potential due to certain salient features of the MOFs such as excellent pore size, ease of tuning the pore chemistry, higher surface area, and chemical and thermal stabilities. MOFs have been explored for various gas separation and storage applications. This review discusses various approaches for fabricating MOFs‐based membranes for the separation of H2 gas from a variety of feeds having various gases CO2, CO, N2, and CH4 as impurities. The emphasis has been put on three types of membranes for H2 separation which include MOFs‐based hollow fibrous/tubular/disk membranes, MOFs‐based mixed matrix membranes (MMMs), and MOFs‐based stand‐alone membranes. In addition, various challenges such as reducing inhomogeneity between MOFs and polymeric matrices have also been discussed. Similarly, the approaches to successfully decorating MOFs on different supports in different configurations have been explained. The possible ways of improving the MOFs‐based membranes for H2 have also been discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Development of hydrogen bonding stabilized conjugated carbonaceous polyaryl organic solvent nanofiltration membranes for molecular sieving.

Author

Baig, Umair and Waheed, Abdul

Subjects
*ORGANIC solvents, *HYDROGEN bonding, *MOLECULAR sieves, *NANOFILTRATION, *ROSE bengal, *CARBONACEOUS aerosols, *POLYACRYLONITRILES
Abstract

Organic solvent nanofiltration (OSN) has enormous potential for transforming the way organic solvents are purified and recovered in the chemical industry. Apart from conventional thin film composite (TFC) nanofiltration membrane fabrication methods, a greener, simpler, and more efficient approach has been utilized to fabricate OSN membranes. Oxidative polymerization of an aqueous solution of a pyrrole monomer on a hydrolyzed/crosslinked polyacrylonitrile (H-PAN/C-PAN) support yielded a dense polypyrrole (PPy) skin layer consisting of a conjugated carbonaceous polyaryl network. The presence of multiple amino groups (>NH) in the PPy chain develops extensive hydrogen bonding with the –COOH and –NH groups present in the H-PAN/C-PAN support. The shift in the ATR-FTIR peaks of PPy upon deposition on the H-PAN/C-PAN support confirmed the interaction between PPy and the H-PAN/C-PAN support. When the OSN performance of the fabricated membranes was studied, the PPy@C-PAN/PETP membrane showed a better performance in terms of rejection of model solutes including charged and neutral molecules compared to the PPy@H-PAN/PETP membrane. Both membranes rejected >99% of Rose Bengal, Congo red, and Eriochrome black T used as model solutes in the current study. For the neutral molecules, PPy@H-PAN@PETP was able to reject 44% of triphenylbenzene (TPB) and >99% of hexaphenylbenzene (HPB), whereas PPy@C-PAN@PETP rejected 72% of TPB and >99% of HPB. In the case of methylene blue, a rejection of 48% was found for PPy@H-PAN/PETP while a rejection of 82% was recorded for PPy@C-PAN/PETP. Moreover, the permeance of n-hexane was found to be 9.3 L m−2 h−1 bar−1 for PPy@H-PAN/PETP and 3.3 L m−2 h−1 bar−1 for the PPy@C-PAN/PETP membrane. [ABSTRACT FROM AUTHOR]

Published
2024
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