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Inner-selective polyethersulfone-polydimethylsiloxane (PES-PDMS) thin film composite hollow fiber membrane for CO2/N2 separation at high pressures

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Separation and Purification Technology 2023年第1期323卷

作者： Zhao, Baiwang Wong, Jun Wen Liang, Can Zeng Wu, Ji Chung, Tai-Shung Zhang, Sui Department of Chemical & Biomolecular Engineering National University of Singapore Singapore117585 Singapore Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei Taiwan

Carbon dioxide (CO2) is the dominant greenhouse gas (GHG) and thus CO2 capture from flue gas of power plants, the main anthropogenic source of emission, is a key approach to mitigating the climate change. Thin-film composite (TFC) membranes have received extensive research attention recently as a promising post-combustion CO2 capture (CO2/N2) technology owing to its energy-efficiency, design versatility and upscaling potential. However, studies with the most industrially relevant membrane configuration, the hollow fibers, are rather limited for this application. Herein, we developed an inner-selective polyethersulfone-polydimethylsiloxane (PES-PDMS) TFC hollow fiber membrane by inner coating PDMS in the lumen of PES hollow fibers and then pressurizing the hollow fibers for CO2/N2 separation. The optimal PES-PDMS TFC membrane can achieve a CO2 permeance of 2150 GPU and a CO2/N2 selectivity of 20 when the operating pressure was between 20–22 bar, which holds good potential for post-combustion CO2 capture. The high separation performance arises from a combination of the stretched PES and PDMS layers. The micro-deformation of both layers under high pressures at the lumen side could possibly reduce the selective layer thickness. It may also induce polymer chain orientation, increase the fractional free volume, and potentially create free volume with smaller sizes, thus enhancing the CO₂ permeability and CO₂/N₂ selectivity from the PDMS and PES layers. © 2023 Elsevier B.V.

关键词： Carbon dioxide

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Structure and Redox Properties of Cemno3 Thin Films

SSRN

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SSRN 2023年

作者： Shen, Kai Fan, Mengjie Rai, Rajeev Kumar Stach, Eric A. Gorte, Raymond J. Vohs, John M. Department of Chemical and Biomolecular Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States

Conformal thin films of a cerium-manganese mixed oxide with a stoichiometry of CeMnOx were deposited on a high-surface-area γ-Al2O3 support by Atomic Layer Deposition (ALD). Upon redox cycling, the CeMnOx film underwent a reversible phase transition between a reduced perovskite CeMnO3 phase and an oxidized fluorite CeMnO3.5 phase, as shown by X-ray diffraction (XRD) and High-Resolution Scanning / Transmission Electron Microscopy (HR-S/TEM). X-ray Photoelectron Spectroscopy (XPS) and Electron Energy Loss Spectroscopy (EELS) revealed that Ce and Mn were in +3-oxidation states in the reduced perovskite phase and +4 and +3 respectively in the oxidized fluorite phase. The composition of the film as a function of P(O2) at 1073 K was measured by coulometric titration and showed that a transition between Ce3+ and Ce4+ occurred at a P(O2) of 10-9 atm, a value that is much higher than that required for oxidizing either reduced bulk ceria or thin-film ceria on γ-Al2O3. These properties make CeMnOx films an interesting candidate for various catalytic applications. © 2023, The Authors. All rights reserved.

关键词： Atomic layer deposition

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Effect of double coating on microencapsulation of levofloxacin using the particles from gas-saturated solutions process as a controlled-release system

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Discover Chemistry 2025年第1期2卷 1-13页

作者： Sharmin, Tanjina Takeshita, Toshihiro Ouchi, Mikio Yoshida, Koji Znad, Hussein Saptoro, Agus Sarker, Zaidul Islam Irie, Keiichi Satho, Tomomitsu Nioh, Atsushi Masuda, Takaaki Muneyoshi, Yuuki Terayama, Suzuko Mishima, Kenji Department of Chemical Engineering Faculty of Engineering Fukuoka University Fukuoka Japan Research Institute of Composite Materials Fukuoka University Fukuoka Japan Resource Circulation Faculty of Environmental Engineering Fukuoka University Fukuoka Japan Faculty of Sciences Fukuoka University Fukuoka Japan Western Australian School of Mines: Minerals Energy and Chemical Engineering Faculty of Science and Engineering Curtin University Perth Australia Department of Chemical Engineering Faculty of Engineering Curtin Malaysia Graduate School Miri Sarawak Malaysia Department of State Program and Food Science Northern Marianas College Saipan USA Faculty of Pharmaceutical Sciences Fukuoka University Fukuoka Japan Yokohama Research Center Pola Chemical Industries Yokohama Japan

A novel double-coating technique was employed to encapsulate levofloxacin (LVF), a potent antibacterial drug, using the particles from gas-saturated solutions (PGSS) process to achieve extended release. The primary coating utilized glyceryl tristearate (GT), a lipid with a high melting point (72 °C), followed by a secondary coating with trimyristin (TM), a lipid with a lower melting point (52 °C). For comparison, a single-coating approach was also explored, using the biocompatible polymer poly-(ε-caprolactone) (PCL). The resulting particles were characterized for their shape, size, and LVF encapsulation efficiency, with confirmation of LVF entrapment provided by Fourier transform infrared (FTIR) spectroscopy, and X‐ray powder diffraction (XRD) analysis. The particles, with an average diameter of 95.3 ± 16.5 μm, exhibited an encapsulation efficiency of up to 92.1 ± 2.5%. Furthermore, in vitro release studies revealed that the double-coated microcapsules effectively suppressed the initial burst release and provided controlled, extended release of LVF (t30D = 36.3%), demonstrating the efficiency of this encapsulation method for prolonged drug delivery.

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Fe-Doped Co3o4/Co2n Heterostructured Urchin-Like Nanowire Arrays with Optimized Electronic Structure as Highly Stable Electrodes for Supercapacitors

SSRN

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SSRN 2023年

作者： Wang, Yuqing Ren, Guangpeng Li, Yu Zhang, Jiawei Chen, Minghua Chen, Qingguo School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin150080 China Department of Chemical and Biomolecular Engineering College of Design and Engineering National University of Singapore 117576 Singapore

Supercapacitors (SCs) exhibit promising potential for high-power energy storage, but the poor energy density compared to secondary batteries greatly restricts the wide-range application of the technology. In this paper, Fe-doped Co3O4/Co2N urchin-like nanowire arrays (Fe-Co3O4/Fe-Co2N) are prepared by hydrothermal and high-temperature nitriding methods. The heterostructure nanowires achieve a high specific capacitance of 1595 F g-1 at 4 A g-1 and remain 96.3% of the initial capacitance after 10000 cycles, much higher than that of the other cobalt-based electrode materials. The symmetric SCs devices assembled by Fe-Co3O4/Fe-Co2N can operate stably under a voltage window of 1.7 V, and the specific capacitance reaches 62.7 F g-1 at a current density of 1 A g-1. The device also shows acceptable cycling stability, demonstrating good cycling lifespans. The improved energy storage properties can be attributed to Fe doping which can tailor the original local electronic structure, and thus enhance the electrical conductivity and rate performance. The heterostructure can generate more active sites and the internal electric field at the interface due to spontaneous charge redistribution, which may enhance ion diffusion kinetics and improve capacity. This work may offer a way to achieve advanced electrochemical performance for the electrode materials of energy storage devices. © 2023, The Authors. All rights reserved.

关键词： Cobalt compounds

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Determination of Film Thicknesses of Metal Oxides Prepared by Atomic Layer Deposition on Sba-15

SSRN

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SSRN 2023年

作者： Wang, Ching-Yu Ferko, Benjamin T. Shen, Kai Winey, Karen I. Vohs, John M. Gorte, Raymond J. Department of Chemical and Biomolecular Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States

ZrO2 and CeO2 films were grown in SBA-15 by Atomic Layer Deposition (ALD) to loadings of 0.98 g oxide/g SBA-15. Scanning Transmission Electron Microscopy (STEM) with Energy Dispersive Spectra (EDS) showed that the oxides grew uniformly inside the mesopores. Film thicknesses were then analyzed as a function of the number of ALD cycles using three methods: 1) mass changes assuming bulk densities for the films;2) changes in pore size from Barret-Joyner-Halenda (BJH) analysis with N2 adsorption isotherms;and 3) small-angle X-ray scattering (SAXS). Film thicknesses assuming bulk densities were between 6 and 8 times smaller than those obtained from BJH analysis. SAXS analysis gave film thicknesses that were approximately twice that obtained from bulk densities. Possible explanations of the discrepancies between these methods are discussed. © 2023, The Authors. All rights reserved.

关键词： Pore size

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One-Dimensional Magnetic FeCoNi Alloy Toward Low-Frequency Electromagnetic Wave Absorption

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Nano-Micro Letters 2022年第10期14卷 260-272页

作者： Bintong Yang Jiefeng Fang Chunyang Xu Hui Cao Ruixuan Zhang Biao Zhao Mengqiu Huang Xiangyu Wang Hualiang Lv Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438People’s Republic of China Willian G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH 43210USA Zhejiang Laboratory Joint-Research Center for Computational MaterialsHangzhou 311100People’s Republic of China

Rational designing of one-dimensional(1D)magnetic alloy to facilitate electromagnetic(EM)wave attenuation capability in low-frequency(2-6 GHz)microwave absorption field is highly desired but remains a significant *** this study,a composite EM wave absorber made of a FeCoNi medium-entropy alloy embedded in a 1D carbon matrix framework is rationally designed through an improved electrospinning *** 1D-shaped FeCoNi alloy embedded composite demonstrates the high-density and continuous magnetic network using off-axis electronic holography technique,indicating the excellent magnetic loss ability under an external EM ***,the in-depth analysis shows that many factors,including 1D anisotropy and intrinsic physical features of the magnetic medium-entropy alloy,primarily contribute to the enhanced EM wave absorption ***,the fabricated EM wave absorber shows an increasing effective absorption band of 1.3 GHz in the low-frequency electromagnetic field at an ultrathin thickness of 2 ***,this study opens up a new method for the design and preparation of high-performance 1D magnetic EM absorbers.

关键词： Medium-entropy magnetic alloy One-dimension Off-axis electronic holography technique Improved electrospinning Lower-frequency electromagnetic wave absorption

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Herceptin-Positive Breast Cancer Treatment via Immunoliposomes Triggered by High-Frequency Ultrasound and Microbubbles

Herceptin-Positive Breast Cancer Treatment via Immunoliposom...

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IEEE International Conference on Nano/Molecular Medicine and engineering (NANOMED)

作者： Waad H. Abuwatfa Shabana Anjum William Pitt Ghaleb A. Husseini Material Science and Engineering PhD program College of Arts and Sciences American University of Sharjah Sharjah UAE Department of Chemical and Biological Engineering American University of Sharjah Sharjah UAE Department of Chemical Engineering Brigham Young University Provo UT USA

ISBN: (数字)9798331516994

ISBN: (纸本)9798331517007

abstract-Functionalizing chemotherapeutics-loaded liposomes with monoclonal antibodies can enhance their specificity and minimize side effects. Targeting the human epidermal growth factor receptor 2 (HER2), overexpressed in HER2-positive breast cancer, is achievable by coating liposomes with an anti-HER2 monoclonal antibody. This study focused on synthesizing doxorubicin (DOX)-loaded immunoliposomes functionalized with anti-HER2 (HER-lip). The release of the drug from these immunoliposomes was triggered by high-frequency ultrasound (HFUS) and microbubbles, which acted as exogenous cavitation-enhancing agents. The platform was evaluated for size, lipid content, protein concentration, stability, and controlled release profiles. In vitro assessments were also performed, including the MTT assay for cell viability and flow cytometry to evaluate drug uptake. This innovative drug delivery system shows potential for combined therapeutic and diagnostic applications, improving personalized cancer care and treatment

关键词： Drugs Proteins Ultrasonic imaging Monoclonal antibodies Lipidomics Epidermis Breast cancer Drug delivery In vitro Immune system

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Pair-Variational Autoencoders (PairVAE) for Linking and Cross-Reconstruction of Characterization Data from Complementary Structural Characterization Techniques

arXiv

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arXiv 2023年

作者： Lu, Shizhao Jayaraman, Arthi Department of Chemical and Biomolecular Engineering University of Delaware NewarkDE19716 United States Department of Materials Science and Engineering University of Delaware NewarkDE19716 United States

In materials research, structural characterization often requires multiple complementary techniques to obtain a holistic morphological view of the synthesized material. Depending on the availability and accessibility of the different characterization techniques (e.g., scattering, microscopy, spectroscopy), each research facility or academic research lab may have access to high-throughput capability in one technique but face limitations (sample preparation, resolution, access time) with other technique(s). Furthermore, one type of structural characterization data may be easier to interpret than another (e.g., microscopy images are easier to interpret than small angle scattering profiles). Thus, it is useful to have machine learning models that can be trained on paired structural characterization data from multiple techniques (easy and difficult to interpret, fast and slow in data collection or sample preparation), so that the model can generate one set of characterization data from the other. In this paper we demonstrate one such machine learning workflow, PairVAE, that works with data from Small Angle X-Ray Scattering (SAXS) that presents information about bulk morphology and images from Scanning Electron Microscopy (SEM) that presents two-dimensional local structural information of the sample. Using paired SAXS and SEM data of newly observed block copolymer assembled morphologies [open access data from Doerk G.S., et al. science Advances. 2023 Jan 13;9(2): eadd3687], we train our PairVAE. After successful training, we demonstrate that the PairVAE can generate SEM images of the block copolymer morphology when it takes as input that sample’s corresponding SAXS 2D pattern, and vice versa. This method can be extended to other soft materials morphologies as well and serves as a valuable tool for easy interpretation of 2D SAXS patterns as well as an engine for generating ensembles of similar microscopy images to create a database for other downstream calculations of stru

关键词： X ray scattering

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Green Separation of N-Butanol/Isobutanol from Azeotropic Methyl Isobutyl Ketone (Mibk) Mixtures Using Deep Eutectic Solvents

SSRN

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SSRN 2024年

作者： Khoshsima, Ali Esfahani, Hamed Sedaghatzadegan Hosseini, Alireza School of Petroleum and Chemical Engineering Hakim Sabzevari University Sabzevar Iran Center for Atmospheric Research University of Oulu Oulu90014 Finland Tehran Iran Department of Chemical and Biomolecular Engineering School of Science and Engineering Tulane University New OrleansLA70118 United States

This research deals with experimentally and computationally studying the capability of deep eutectic solvents (DESs) to obtain an efficient liquid – liquid extraction at atmospheric pressure and 298.15 K. The utilized DESs are ChCl – urea, ChCl – EG, ChCl – glucose, ChCl – glycerol, and ChCl – 1,2-PD. In this direction, the extraction efficiency of DES to separate n-butanol/isobutanol from azeotropic systems, Methyl isobutyl ketone (MIBK) + n-butanol/isobutanol, is studied. The obtained results showed that all the investigated DESs exhibit a distribution coefficient, β, exceeding unity (β>1). Furthermore, the determined selectivity values for the utilized extractants significantly surpass unity (S>>1) that is beneficial from industrial applications point of view. Furthermore, the Othmer–Tobias approach was utilized to examine the consistency of the tie-line compositions. In case of thermodynamic modelling, the group contribution UNIFAC model has been utilized to study the phase equilibria and to check the consistency. The findings from the UNIFAC analysis align well with the results obtained from the experimental observations. © 2024, The Authors. All rights reserved.

关键词： Phase equilibria

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Determination of Film Thicknesses of Metal Oxides Prepared by Atomic Layer Deposition on Sba-15

SSRN

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SSRN 2023年

作者： Vohs, John M. Wang, Ching-Yu Ferko, Benjamin T. Shen, Kai Winey, Karen I. Gorte, Raymond J. Department of Chemical and Biomolecular Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States

关键词： Pore size

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