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Performance evaluation of emerging block copolymer membranes for oil-water separation

Green Technology, Resilience, and Sustainability 2022年第1期2卷 1-11页

作者： Al-Maas, Mashael Hussain, Altaf Minier-Matar, Joel Hassan, Mohammad K. Al-Maadeed, Mariam Al Ali Alamgir, Karim Adham, Samer ConocoPhillips Global Water Sustainability Center Qatar Science & Technology Park Doha Qatar Center for Advanced Materials Qatar University Doha Qatar Materials Science & Technology Program College of Arts & Sciences Qatar University Doha Qatar Department of Chemical & Biomolecular Engineering University of Houston Houston USA

Membrane processes such as microfiltration (MF) and ultrafiltration (UF) are known to be the best advanced technologies for water reuse application. Numerous research efforts have been conducted in areas of modifying commercial MF/UF products or synthesizing novel materials promising enhanced oil-water separation performances. Block copolymer (BCP)-based membranes have recently gained increased popularity due to their improved water permeabilities. This study applies a comprehensive testing protocol for performance evaluation of two emerging poly (styrene-block-methyl methacrylate) BCP membranes developed by the project team. Tests mimicking industrial conditions were conducted by using a representative synthetic produced water and operating repeat tests. Both BCP membranes (referred to as A & B) were found to possess high permeabilities of 5538 and 12,424 LMH/bar, respectively. Membrane B showed higher organic rejection at 79% against 74% rejection obtained for membrane A. The novel membranes were then compared to a relevant commercial product. Lower permeability at 3831 LMH/bar and slightly higher rejection performance (within ~ 10%) were obtained for the commercial membrane as compared to the BCP membranes. Test results obtained for those novel membranes being still in the development stage will be utilized in future studies investigating further optimization of the membrane structure and oil-water separation performance.

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Nano-Engineered Ga-Doped Llzo Electrolytes: A Leap Toward High-Performance Solid-State Batteries

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SSRN 2023年

作者： Jo, Seong-Jun Jeon, Young-Gue Hwang, Sang-Yeop Lim, Sung-Hwan Kumar, Ramachandran Vasant Kim, Kwang-Bum Kim, Hyun-Kyung Department of Battery Convergence Engineering Kangwon National University 1 Kangwondaehak-gil Chuncheon24341 Korea Republic of Interdisciplinary Program in Advanced Functional Materials and Devices Development Kangwon National University Chuncheon24341 Korea Republic of Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road CambridgeCB3 0FS United Kingdom Department of Materials Science and Engineering Yonsei University 134 Shinchon-dong Seodaemoon-gu Seoul120-749 Korea Republic of

Garnet-type Li7La3Zr2O12 (LLZO) Li-ion solid electrolytes are promising candidates for the next generation of safe solid-state batteries. However, the lack of a methodology to control the ceramic powder particle size for obtaining and densifying fast-ion-conducting cubic garnet hinders the application of the Li7La3Zr2O12 as a Li+ ion solid electrolyte. In this study, the doping concentration of Ga, calcination temperature of the Ga-doped LLZO (Ga-LLZO) precursor for achieving nanostructured powders, and the evolution of grain size during sintering conditions are explored to determine the optimum parameters to prepare highly conductive ceramics using the microwave-assisted solvothermal method. The nanostructured precursor (−3 S cm−1) that be employed as a solid electrolyte in a lithium-ion battery. The above approach opens up a new synthesis avenue for making doped Li7La3Zr2O12-type materials with improved properties for energy storage applications. © 2023, The Authors. All rights reserved.

关键词： Solid electrolytes

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Ultrafast THz nonlinear modulation in an electrically tunable graphene thin film perfect absorber 16

Ultrafast THz nonlinear modulation in an electrically tunabl...

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16th International Congress on Artificial materials for Novel Wave Phenomena, Metamaterials 2022

作者： Tasolamprou, A.C. Koulouklidis, A.D. Doukas, S. Kyriakou, E. Ergoktas, M.S. Daskalaki, C. Economou, E.N. Kocabas, C. Lidorikis, E. Kafesaki, M. Tzortzakis, S. Institute of Electronic Structure and Laser Foundation for Research and Technology Hellas N. Plastira 100 Crete Heraklion71110 Greece Department of Materials Science and Engineering University of Ioannina Ioannina45110 Greece Department of Materials Science and Technology University of Crete Heraklion70013 Greece Department of Materials University of Manchester ManchesterM13 9PL United Kingdom National Graphene Institute University of Manchester ManchesterM13 9PL United Kingdom Department of Physics University of Crete Heraklion70013 Greece Henry Royce Institute for Advanced Materials University of Manchester ManchesterM13 9PL United Kingdom Ioannina45110 Greece Science Program Texas A&M University at Qatar P.O. Box 23874 Doha Qatar

ISBN: (数字)9781665465847

ISBN: (纸本)9781665465847

We demonstrate an electrically tunable, ultrafast, nonlinear, terahertz absorption modulator operating at 2.3 THz. The device consists of a uniform graphene sheet placed on a Au-grounded ionic liquid substrate. An electrostatic gating applied between the graphene sheet and the back-plate controls the underlying conditions for the graphene while nonlinear modulation is assessed via self-action when the THz field strength increases from 145 to 654 kV/cm. The time-dependent thermodynamic response of the system during interaction with ultrafast electric fields is further supported via the theoretical analysis of the experimental findings. © 2022 IEEE.

关键词： Graphene

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Multifunctional Microcoaxial Fibers for Electrochemical, Optical and Spectroelectrochemical Sensing

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SSRN 2022年

作者： Shi, Yuesong Ward, Spencer Riley, Conor Sirbuly, Donald J. Materials Science and Engineering Program University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Department of Electrical and Computer Engineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Department of Nanoengineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States

Developing microdevices capable of performing multifunctional sensing measurements is of grand importance for various applications including the study of diseases, rapid biomolecular detection, and drug discovery. In this paper, we demonstrate a compact electro-optical multimodal microprobe with a small footprint (~10 µm diameter), low electrical impedance (~ 10 kΩ at 1 kHz), and high optical spatial resolution. The electrical channel is validated by selectively detecting dopamine and serotonin via electrochemistry with a limit of detection of 800 nM and 1.2 μM, respectively. The optical channel is then combined with the adjacent electrical channel to perform localized spectroelectrochemical probing of electrochromic materials including conductive polymers such as poly(3,4-ethylenedioxythiophene) and thiazine dyes such as methylene blue. Due to the size of the probe, dimensional and mechanical tunability, and minimal interference between the co-localized electrical and optical channels, this device architecture shows great promise for in vivo sensing and in situ biomolecular measurements. © 2022, The Authors. All rights reserved.

关键词： Amines

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Effect of Polyisoprene Microstructure on the Thermodynamics, Viscoelastic, and Dielectric Properties in the Bulk and during Flow in Nanopores

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Macromolecules 2025年第12期58卷 6052-6065页

作者： Panagiotis Kardasis Michail Danikas Nikolaos Patelis Konstantinos Ntetsikas Nikos Hadjichristidis George Floudas Department of Physics University of Ioannina 45110 Ioannina Greece Polymer Synthesis Laboratory Chemistry Program KAUST Catalysis Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia Department of Physics University of Ioannina 45110 Ioannina Greece；Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany；University Research Center of Ioannina (URCI)─Institute of Materials Science and Computing 45110 Ioannina Greece

We report the effect of polyisoprene (PI) microstructure on the thermodynamics, viscoelasticity, and molecular dynamics, the latter via dielectric spectroscopy in bulk and during flow in cylindrical nanopores. A series of monodisperse PIs with microstructurescis-1,4,trans-1,4, 3,4, and 1,2 are synthesized via anionic polymerization using high-vacuum techniques using polar additives. In thermodynamics, we show that the liquid-to-glass temperature (Tg) decreases linearly with 1,4 units content asTg[K] = (289 ± 4)–0.9 ×w1,4%, whereas it increases quadratically with 3,4-units content asTg=Tg0%+(w3,4%)250[K]. Scaling of specific heats,cpglass,cpliquid,Tg, and the increment in specific heat atTg(Δcp) are established as a function of microstructure. In rheology, the zero-shear viscosity scales as η0= η0%×w1,4%–u, whereu= 5.4 ± 0.3. Despite this, the plateau modulus is independent of microstructure. All dielectrically active processes are strongly affected by microstructure. The dielectric strength of the β- and α-processes increases strongly with increasing 3,4-unit content, whereas that of the chain mode decreases precipitously. The calculated component of dipole moment along the polymer backbone scales with microstructure as μcis–1,4> μtrans–1,4> μ1,2> μ3,4≈ 0. The β-process shifts withTgand has characteristics of a Johari–Goldstein process with activation energies predicted by the coupling model. Lastly, we show that it is possible to separate blend components comprising different microstructures by the way of penetration within cylindrical nanopores, giving another example of what is known as “topology sorting.”

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Alternating Cu Segregation and its Stabilization Mechanism for Coherent Η' Precipitates in Al-Zn-Mg-Cu Alloys

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SSRN 2024年

作者： Chiu, Yu-Ning Chung, Tsai-Fu Yen, Shao-Yu Yu, Chung-Yi Lin, Wei-Ting Hsieh, Chia-Chia Lin, Shih-Kang Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Aluminum Prod R&D Section New Materials R&D Department Kaohsiung81233 Taiwan Research Center National Cheng Kung University Tainan70101 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Core Facility Center National Cheng Kung University Tainan70101 Taiwan

The 7000 series (Al-Zn-Mg) Al-alloys are renowned for their exceptional "lightweight-high strength" properties, primarily owing to nano-sized meta-stable η' precipitate as the main strengthening phase. However, these η' precipitates are susceptible to transforming into the stable η2 phase at elevated temperatures, resulting in a decline in strength. To mitigate this, Cu-segregation has been proposed as a promising method for stabilizing these meta-stable precipitates. In this study, we conducted a thorough investigation on the structural and energetic changes between Cu-free and Cu-segregated η' and η2 precipitates. Utilizing DFT calculations and HAADF-STEM characterizations, we proposed a unique alternating Cu-segregation pattern. This pattern induces significant structural modifications within the bulk of η' precipitates and at the precipitate-matrix interface, markedly enhancing their interfacial and bulk energetics. We believe these modifications are the key factor in improving precipitate stability. Based on our findings, the underlying mechanism of solute segregation was elucidated and a novel strategy for optimal design of Al-Zn-Mg alloys was proposed. © 2024, The Authors. All rights reserved.

关键词： Zinc alloys

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Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Rui Xu Tong Lin Jiaming Luo Xiaotong Chen Elizabeth R. Blackert Alyssa R. Moon Khalil M. JeBailey Hanyu Zhu Department of Materials Science and Nano Engineering Rice University Houston U.S.A. Applied Physics Graduate Program Rice University Houston U.S.A. Nanotechnology Research Experience for Undergraduates (Nano REU) Program Rice University Houston U.S.A.

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO 3 . We designed planar ultrafast concentrators that amplifies transient electric fiel... 详细信息

ISBN: (纸本)9781957171258

关键词： Concentrators Electric fields Fast Fourier transforms Field enhancement Fused silica Second harmonic generation

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A Hybrid System Combining Direct Contact Membrane Distillation (Dcmd) and Electrochemical Switched Ion Exchange (Esix) for Efficient Lithium Recovery from Simulated Brine

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SSRN 2023年

作者： Gulied, Mona Zavahir, Sifani Elmakki, Tasneem Park, Hyunwoong Shon, Hokyong Han, Dong Suk Center for Advanced Materials Qatar University Doha Qatar Materials Science and Technology Program College of Arts and Science Qatar University Doha Qatar School of Energy Engineering Kyungpook National University Daegu41566 Korea Republic of ARC Research Hub for Nutrients in a Circular Economy Center for Technology in Water and Wastewater School of Civil and Environmental Engineering Faculty of Engineering and IT University of Technology SydneyNSW2007 Australia Department of Chemical Engineering College of Engineering Qatar University Doha Qatar

Recovering valuable elements such as lithium (Li) from seawater reverse osmosis (SWRO) brine is crucial for building a sustainable economy due to its high storage density, making it an ideal material for energy storage. In this study, a novel hybrid system that combines direct contact membrane distillation (DCMD) and electrochemical switched ion exchange (ESIX) was designed to achieve simultaneous SWRO brine enrichment and Li recovery. The DCMD process concentrated the SWRO brine using electrospun nanofiber membranes (ENMs) made of polyvinylidene fluoride (PVDF), with the incorporation of reduced graphene oxide (rGO) nanoparticles enhancing the morphological, thermal, and mechanical stability of the PVDF ENMs. The water contact angle (WCA) of the 1-rGO/PVDF ENM was 142.08°, indicating an improved hydrophobic property that resulted in the recovery of 12% freshwater from simulated SWRO brine and a 2.4-fold increase in Li+ concentration. The 1-rGO/PVDF ENM exhibited stable performance, with an 11% reduction in WCA after 15 hours of brine concentration. In the hybrid operation, a Li-selective LiAlO2 electrode, coupled with an activated carbon counter electrode, demonstrated remarkable Li recovery for Li capture solutions enriched by the rGO-PVDF membrane in the DCMD step. Compared to the Li concentration in the DCMD feed, sequential Li capture and release cycles recovered 91.8% of Li, highlighting the critical role of the hybrid mode operation in concentrating Li from simulated brine solutions. © 2023, The Authors. All rights reserved.

关键词： Hybrid systems

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Rapid Electronic Transport Channel of Co-P with Mo in a Heterostructure Embedded with P, N Dual Doped Porous Carbon for Electrocatalytic Oxygen and Hydrogen Evolution

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ChemNanoMat 2024年第7期10卷

作者： Dey, Tapan Rajput, Anubha Jhaa, Gaurav Matsagar, Babasahab M. Chen, Norman C.-R Kumar, Nitish Salunkhe, Rahul Wu, Kevin C.-W. Chakraborty, Biswarup Dutta, Saikat Electrochemical Energy & Sensor Research Laboratory Amity Institute of Click Chemistry Research & Studies Amity University Noida India Department of Chemistry Indian Institute of Technology Delhi Hauz Khas New Delhi110016 India Chemical Information Sciences Laboratory Department of Chemistry Pondicherry University Kalapet Pondicherry605014 India Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Materials Research Laboratory Department of Physics Indian Institute of Technology Jammu Jammu India Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Chung-Li Taiwan Department of Chemical Engineering Chung Yuan Christian University No. 200 Zhongbei Rd. Zhongli Dist. Taoyuan City320 Taiwan

We developed a molybdenum (Mo)-doped cobalt (Co)-heterostructure embedded on a phosphorous (P) and nitrogen (N) dual-doped porous carbon which exhibits an intrinsic electronic transport channel of Co to Mo and P. The P,Mo,O−Co/PNC/NF (NF=Nickel foam) electrode offers 335 mV overpotential at 10 mA cm−2 in OER as compared with PMA-ZIF67-NC/NF and ZIF67-NC/NF electrode with an overpotential of 357 and 373 mV respectively. Linear sweep voltammetry (LSV) of overall water splitting (OWS) supports that the current density gradually increased at a cell potential of 1.6 V with a maximum of 40 mA with a corresponding cell potential of 1.79 V at a current density of 10 mA cm−2. Density functional theory (DFT) calculations for water adsorption on optimized [111] surface of Co, CoMo, and CoMoP2 with adsorbed H2O and corresponding lattice determine the electron density difference of [111] surface with adsorbed H2O for Eads (eV) 4.23 corresponds to adsorption energy for CoMoP2. XANE-EXAFS spectroscopy of P,Mo,O−Co/PNC at Co K edge and Mo K edge suggests the presence of higher valence of both Cox+ and Mox+ without metallic Co and Mo and Co−P and Mo−P bonds as major structural units due to phosphidation as determined by R-space FT-EXAFS spectra. © 2024 Wiley-VCH GmbH.

关键词： Cobalt

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Lambda Theta Reflectometry for protein biosensing 17

Lambda Theta Reflectometry for protein biosensing

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Frontiers in Biological Detection: From Nanosensors to Systems XVII 2025

作者： Klose, Alanna M. Katz, Joseph D. Boni, Robert Miller, Benjamin L. Department of Dermatology University of Rochester RochesterNY14627 United States Materials Science Program University of Rochester RochesterNY14627 United States Laboratory of Laser Energetics University of Rochester RochesterNY14627 United States Department of Biomedical Engineering University of Rochester RochesterNY14627 United States

ISBN: (纸本)9781510684249

Label-free reflectometry sensors detect proteins by measuring the reflectance properties of a thin film on a substrate. As light encounters a thin film layer stack, reflections from the layer boundaries interfere with each other encoding information about layer properties onto the reflected light. Existing reflectometric techniques measure changes in thin film thickness by observing a change in the interference spectrum, polarization state or reflectance relative to an initial antireflective condition at fixed angle and wavelength. These techniques are used for biosensing by detecting changes in film thickness as analyte binds to surface-bound ligand. Existing approaches are limited by low multiplexing capability, limited sensitivity, or by requiring high manufacturing tolerances of the detector substrates. Lambda Theta Reflectometry (LTR) is a novel reflectometric technique that measures changes in film thickness by measuring the location of null reflectivity as a function of wavelength (lambda) and angle of incidence (theta). The substrate is simultaneously illuminated with a range of angles and wavelengths and reflected light is angularly and spectrally resolved. The optical thickness of the thin film is retrieved by fitting the location of the null in lambda theta space. A prototype LTR reflectometer has demonstrated the ability to measure SiO2 layer thickness with milli-Ångstrom precision. LTR measurements of SiO2/Si oxide films are in excellent agreement with spectroscopic ellipsometry for films thickness ranging from 1390-1465 Å. LTR enables sensitive measurements across a range of analyte concentrations without requiring stringent control over initial layer stack thickness. © 2025 SPIE.

关键词： Ellipsometry

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