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Two-Dimensional Metal-Organic Frameworks/Epoxy Composite Coatings with Superior O2/H2O Resistance for Anticorrosion Applications

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ACS applied materials & interfaces 2024年第31期16卷 41421-41434页

作者： Hao-Hsuan Hsia You-Liang Chen Yu-Ting Tai Hong-Kang Tian Chung-Wei Kung Wei-Ren Liu Department of Chemical Engineering R&D Center for Membrane Technology Research Center for Circular Economy Chung Yuan Christian University Taoyuan 32023 Taiwan. Department of Graduate Institude of Applied Science and Technology National Taiwan University of Science and Technology Taipei City 106335 Taiwan. Department of Chemical Engineering National Cheng Kung University Tainan City 70101 Taiwan. Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan. Hierarchical Green-Energy Materials (Hi-GEM) Research Center National Cheng Kung University Tainan 70101 Taiwan.

Corrosion protection technology plays a crucial role in preserving infrastructure, ensuring safety and reliability, and promoting long-term sustainability. In this study, we combined experiments and various analyses to investigate the mechanism of corrosion occurring on the epoxy-based anticorrosive coating containing the additive of two-dimensional (2D) and water-stable zirconium-based metalorganic frameworks (Zr-MOFs). By using benzoic acid as the modulator for the growth of the MOF, a 2D MOF constructed from hexazirconium clusters and BTB linkers (BTB = 1,3,5-tri(4-carboxyphenyl)benzene) with coordinated benzoate (BA-ZrBTB) can be synthesized. By coating the BA-ZrBTB/epoxy composite film (BA-ZrBTB/EP) on the surface of cold-rolled steel (CRS), we found the lowest coating roughness (RMS) of BA-ZrBTB/EP is 2.83 nm with the highest water contact angle as 99.8°, which represents the hydrophobic coating surface. Notably, the corrosion rate of the BA-ZrBTB/EP coating is 2.28 × 10 mpy, which is 4 orders of magnitude lower than that of the CRS substrate. Moreover, the energy barrier for oxygen diffusion through BA-ZrBTB/EP coating is larger than that for epoxy coating (EP), indicating improved oxygen resistance for adding 2D Zr-MOFs as the additive. These results underscore the high efficiency and potential of BA-ZrBTB as a highly promising agent for corrosion prevention in various commercial applications. Furthermore, this study represents the first instance of applying 2D Zr-MOF materials in anticorrosion applications, opening up new possibilities for advanced corrosion-resistant coatings.

关键词： 2D structure Zr-based MOFs anticorrosion density functional theory epoxy hydrophobic

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Tipt: The Tracer Injection Planning Tool

SSRN

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SSRN 2022年

作者： González-Pinzón, Ricardo Dorley, Jancoba Singley, Joel Singha, Kamini Gooseff, Michael Covino, Tim Civil Construction and Environmental Engineering University of New Mexico AlbuquerqueNM United States Department of Geology and Geological Engineering Hydrologic Science and Engineering Program Colorado School of Mines GoldenCO United States Environmental Studies Program University of Colorado BoulderCO United States Institute of Arctic and Alpine Research BoulderCO United States Ecosystem Science and Sustainability Colorado State University Fort CollinsCO United States

We combined the advection-dispersion-reaction equation, peak concentration estimates based on a meta-analysis of hundreds of tracer injections in streams and rivers, and mass balances in a dynamic Excel Workbook to 1) help users decide how much tracer mass should be added to achieve dynamic concentration ranges that reduce known issues associated with breakthrough curve tail truncation, and 2) generate tables and graphs that can be used to plan logistics. Our Tracer Injection Planning Tool, TIPT, handles instantaneous and continuous tracer injections, assumes steady-state and uniform flow conditions, and first-order decay or production. While those assumptions do not strictly apply to natural streams, they simplify the planning of tracer injections with a predictive ability disproportionally favorable with respect to the few inputs required. We demonstrate the use of TIPT through two case studies, i.e., a continuous injection in a 2nd order stream and an instantaneous injection in a 7th order stream. © 2022, The Authors. All rights reserved.

关键词： Solute transport

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Giant Thermomechanical Bandgap engineering in Quasi-two-dimensional Tellurium

arXiv

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arXiv 2023年

作者： Hussain, Naveed Ahmed, Shehzad Tep, Hüseyin U. Ullah, Kaleem Shahzad, Khurram Wu, Hui Shcherbakov, Maxim R. Department of Electrical Engineering and Computer Science University of California Irvine IrvineCA92697 United States State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China College of Physics and Optoelectronic Engineering Shenzhen University Guangdong518060 China Micro and Nano-Technology Program School of Natural and Applied Sciences Middle East Technical University Ankara06800 Turkey Department of Electrical and Computer Engineering University of Delaware NewarkDE19711 United States Department of Physics Middle East Technical University Ankara06800 Turkey

Mechanical straining-induced bandgap modulation in two-dimensional (2D) materials has been confined to volatile and narrow modulation due to substrate slippage and poor strain transfer. We report the thermomechanical modulation of the inherent bandgap in quasi-2D tellurium nanoflakes (TeNFs) via non-volatile strain induction during hot-press synthesis. We leveraged the coefficient of thermal expansion (CTE) mismatch between TeNFs and growth substrates by maintaining a high-pressure enforced non-slip condition during thermal relaxation (623 to 300K) to achieve the optimal biaxial compressive strain of -4.6 percent in TeNFs/sapphire. This resulted in an enormous bandgap modulation of 2.3 eV, at a rate of up to ~600 meV/%, which is two-fold larger than reported modulation rate. Strained TeNFs display robust band-to-band radiative excitonic blue photoemission with an intrinsic quantum efficiency (IQE) of c.a. 79.9%, making it promising for energy efficient blue LEDs and nanolasers. Computational studies reveal that biaxial compressive strain inhibits exciton-exciton annihilation by evading van-Hove singularities, hence promoting radiative-recombination. Bandgap modulation by such nonvolatile straining is scalable to other 2D semiconductors for on-demand nano(opto)-electronics. Copyright © 2023, The Authors. All rights reserved.

关键词： Energy gap

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Antibacterial and cytotoxicity activity of green synthesized silver nanoparticles using aqueous extract of naartjie(Citrus unshiu)fruit peels

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Emerging Contaminants 2024年第4期10卷 153-163页

作者： Livhuwani Mafhala Nomcebo Khumalo Nkosingiphile Excellent Zikalala Shohreh Azizi Karen Jacqueline Cloete Garland Kgosi More Ilunga Alain Kamika Touhami Mokrani Ali Akbar Zinatizadeh Malik Maaza UNESCO-UNISA Africa Chair in Nanoscience and Nanotechnology College of Graduates Studies University of South AfricaMuckleneuk RidgePretoria392South Africa Nanosciences African Network(NANOAFNET)-Materials Research Department iThemba LABS-National Research FoundationSomerset WestP.O.Box 722Cape Town 7129South Africa Department of Environmental Sciences College of Agriculture and Environmental SciencesUniversity of South AfricaPrivate Bag X06Florida 1710South Africa Institute of Nanotechnology and Water Sustainability School of ScienceCollege of ScienceEngineeringand TechnologyFlorida CampusUniversity of South AfricaP.O Box 392FloridaRoodepoort1709South Africa College of Agriculture and Environmental Sciences Laboratories University of South AfricaPrivate Bag X06FloridaJohannesburg1710South Africa Department of Chemical Engineering University of South AfricaPrivate Bag X6FloridaJohannesburg1709South Africa Environmental Research Center Department of Applied ChemistryRazi UniversityKermanshah P.O.Box 67144-14971Iran

The application of plant extracts in the green synthesis of silver nanoparticles(AgNPs)has attracted significant attention owing to their eco-friendliness and cost-effective ***,nanoparticles synthesized from plant materials may also display unique physicochemical *** study described an improved synthesis process for silver nanoparticles(AgNPs)from the peel of the Citrus unshiu fruit,an agricultural waste *** addition to evaluating the produced AgNPs'physico-chemical characteristics,the research also examines their antibacterial and cytotoxic/anticancer *** color change from yellow to dark brown was observed immediately when 20 ml of Citrus unshiu fruit peel extract was added to 0.5 g of silver nitrate.A surface plasmon resonance band at 424 nm revealed by ultra-violet spectroscopy was used as additional confirmation that AgNP had *** scanning electron microscope(SEM),and the transmission electron microscope(TEM),revealed spherical-shaped NPs with a mean size of 23 ***,X-ray diffraction(XRD)confirmed the high crystallinity of the obtained NPs while Fourier transform infrared spectroscopy(FTIR)confirmed the bioreducing capacity of the Citrus unshiu fruit peel *** minimum inhibitory concentration(MIC)(31.25 mg/mL)of AgNPs significantly revealed a strong dose-dependent antibacterial effect on Staphy-lococcus aureus and Bacillus *** contrast,their impact on gram-negative bacteria,such as Escher-ichia coli and Salmonella typhimurium,displayed an MIC of 250 mg/*** assessment of cytotoxicity on human embryonic kidney cells(HEK293)and lung cancer cells(A549)through a 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide assay revealed no detectable cytotoxic *** IC 50 values were determined as 37.73±0.34 mg/mL for HEK293 and 56.37±0.73 mg/mL for A549,indicating the absence of significant adverse impacts on these cell *** anticancer drug doxorubicin was used as a reference

关键词： Antimicrobial activity Citrus unshiu Cytotoxicity activity Green synthesis Silver nanoparticle

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Influence of Grain Size on Strain-Induced Phase Transformation in a Crconi Multi-Principal Element Alloy

SSRN

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SSRN 2024年

作者： Bertoli, Gustavo Clarke, Amy J. Kaufman, Michael J. Kiminami, Claudio Shyint Gil Coury, Francisco Colorado School of Mines George S. Ansell Department of Metallurgical and Materials Engineering 1500 Illinois St. GoldenCO80401 United States Federal University of São Carlos Graduate Program in Materials Science and Engineering Rod. Washington Luis km 235 SP-310 SP São Carlos13565-905 Brazil Sigma Manufacturing Sciences Division Los Alamos National Laboratory Los AlamosNM87545 United States Federal University of São Carlos Department of Materials Engineering Rod. Washington Luis km 235 SP-310 SP São Carlos13565-905 Brazil

A Cr40Co40Ni20 (at.%) alloy with different grain sizes was analyzed through in-situ synchrotron X-ray diffraction during tensile testing. The FCC starting structure underwent a partial strain-induced transformation to HCP (TRIP effect) and the percent transformed was measured throughout the deformation. The critical stress required to form a certain HCP fraction was shown to follow a Hall-Petch relation (σ = σ0,HCP + KHCPd-0.5), with the Hall-Petch slope being approximately the same for yield stress and TRIP effect (Ky ~ KHCP ~ 650 MPa/μm-0.5). The HCP fraction and HCP formation rate are controlled by the strain level, being insensitive to grain size in terms of strain. Furthermore, this work developed a Hall-Petch-based model that correlates the applied stress, the transformed phase fraction, and the initial FCC grain size. It predicts the stress required to form a certain HCP fraction, or the fraction formed when a certain stress is applied. We also proposed a mechanism to explain the grain size dependence of the TRIP effect and discuss how the TRIP effect and its early activation in the Cr40Co40Ni20 alloy provide high work-hardening capacity, which improves ductility and toughness. Here, a refined FCC grain size (1.3 μm) was shown to increase the yield stress by at least 100% (417 → 834 MPa), compared to a coarser grain material (22.4 μm), while maintaining a high ductility of 41%. This work contributes to a better understanding of the deformation mechanisms, mainly the strain-induced phase transformation (TRIP), highlighting their impact and importance on mechanical properties. © 2024, The Authors. All rights reserved.

关键词： Ductility

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Injectable cross-linked hyaluronic acid hydrogels with epigallocatechin gallate loading as vitreous substitutes

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International Journal of Biological Macromolecules 2024年第Part1期275卷 133467页

作者： Chen, Huai-An Tai, Yi-Ning Hsieh, Erh-Hsuan Thacker, Minal Lin, I-Chan Tseng, Ching-Li Lin, Feng-Huei Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Shuang-Ho Campus New Taipei City Taiwan Institute of Biomedical Engineering College of Medicine & College of Engineering National Taiwan University Taipei City Taiwan 17W Hong Kong Science Park Hong Kong Department of Ophthalmology Wan Fang Hospital Taipei Medical University Taipei City Taiwan Department of Ophthalmology School of Medicine College of Medicine Taipei Medical University Taipei City Taiwan International Ph. D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Shuang-Ho Campus New Taipei City Taiwan Research Center of Biomedical Device College of Biomedical Engineering Taipei Medical University Taipei City Taiwan International Ph. D. Program in Cell Therapy and Regenerative Medicine College of Medicine Taipei Medical University Taipei City Taiwan National Health Research Institutes Miaoli County Taiwan

Hyaluronic acid (HA) serves as a vitreous substitute owing to its ability to mimic the physical functions of native vitreous humor. However, pure HA hydrogels alone do not provide sufficient protection against potential inflammatory risks following vitrectomy. In this study, HA was crosslinked with 1,4-butanediol diglycidyl ether (BDDE) to form HA hydrogels (HB). Subsequently, the anti-inflammatory agent epigallocatechin gallate (EGCG) was added to the hydrogel (HBE) for ophthalmic applications as a vitreous substitute. The characterization results indicated the successful preparation of HB with transparency, refractive index, and osmolality similar to those of native vitreous humor, and with good injectability. The anti-inflammatory ability of HBE was also confirmed by the reduced expression of inflammatory genes in retinal pigment epithelial cells treated with HBE compared with those treated with HB. In a New Zealand white rabbit model undergoing vitreous substitution treatment, HBE 50 (EGCG 50 μM addition) exhibited positive results at 28 days post-surgery. These outcomes included restored intraocular pressure, improved electroretinogram responses, minimal increase in corneal thickness, and no inflammation during histological examination. This study demonstrated the potential of an injectable HA-BDDE cross-linked hydrogel containing EGCG as a vitreous substitute for vitrectomy applications, offering prolonged degradation time and anti-inflammatory effects postoperatively. © 2024 The Authors

关键词： Hyaluronic acid

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Forming multilayer graphene at different precursor temperature using cooking oil waste from AYAMAS via chemical vapour deposition

Forming multilayer graphene at different precursor temperatu...

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Innovative Manufacturing, Mechatronics & Material Forum 2022, iM3F 2022

作者： Nurfazianawatie, M.Z. Omar, H. Rosman, N.F. S. A. Malek, N. Afaah, A.N. Buniyamin, I. Salifairus, M.J. Malek, M.F. Mahat, M.M. Rusop, M. Asli, N.A. Centre for Functional Materials and Nanotechnology Institute of Science Universiti Teknologi MARA Shah Alam Selangor40450 Malaysia School of Physics and Material Studies Faculty of Applied Sciences Universiti Teknologi MARA Shah Alam Selangor40450 Malaysia NANO-ElecTronic Centre College of Engineering Universiti Teknologi MARA Shah Alam Selangor40450 Malaysia

Industrial cooking waste is a worldwide concern. About 24 million metric tons (Mt) of waste oil are globally generated annually from food production industries which have caused severe environmental damage to landfills. To benefit the cooking oil waste, the carbon source is used to synthesise graphene film. The carbon source is cost-effective in terms of waste reduction and environmental benefits. This study used cooking oil waste from AYAMAS Food Corporation Sdn Bhd and nickel foil as precursor and substrate, respectively. The 200 scc/m flow rate and 1000 °C of deposition temperature were fixed. Samples were prepared in different precursor temperatures in the range of 275 to 400 °C with an increment of 25 °C via the double thermal chemical vapour deposition (DT-CVD) method. Raman's spectra showed that 350 °C had multilayer graphene with the intensity of graphene I2D/IGof 0.38, which is close to 0.5 (multilayer graphene). The UV-Vis results showed that 350 °C had the highest reflectivity value at 250 nm, while FESEM images showed a clear hexagonal shape at 350 °C. The optimum parameter for the synthesis of multilayer graphene was 350 °C precursor temperature. Multilayer graphene was successfully synthesised using industrial cooking oil waste, AYAMAS, as a carbon source via the double thermal chemical vapour deposition method. © 2022 Elsevier Ltd. All rights reserved.

关键词： Graphene

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Reshaped Weyl fermionic dispersions driven by Coulomb interactions in MoTe2

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Physical Review B 2022年第4期105卷 045143-045143页

作者： Seoung-Hun Kang Sangjun Jeon Hyun-Jung Kim Wonhee Ko Suyeon Cho Se Hwang Kang Sung Wng Kim Heejun Yang Hyo Won Kim Young-Woo Son Korea Institute for Advanced Study Seoul 02455 Korea Department of Physics Chung-Ang University Seoul 06974 Korea Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany Samsung Advanced Institute of Technology Suwon 16678 Korea Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Korea Department of Energy Science Sungkyunkwan University Suwon 16419 Korea Department of Physics Korea Advanced Institute of Science and Technology Daejeon 34141 Korea

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor the shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals.

关键词： Electronic structure First-principles calculations Quasiparticles & collective excitations Topological materials Weyl fermions Scanning electron microscopy Scanning tunneling spectroscopy

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Zwitterionic modified and freeze-thaw reinforced foldable hydrogel as intraocular lens for posterior capsule opacification prevention

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Biomaterials 2024年 309卷 122593-122593页

作者： Yang, Cheng-Jui Huang, Wei-Lun Yang, Yu Kuan, Chen-Hsiang Tseng, Ching-Li Wang, Tzu-Wei Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Department of Ophthalmology National Taiwan University Hospital Hsin-Cchu Branch Hsinchu Taiwan Interdisciplinary Program of Life Science and Medicine National Tsing Hua University Hsinchu Taiwan Division of Plastic Surgery Department of Surgery National Taiwan University Hospital Taipei Taiwan Graduate Institute of Clinical Medicine College of Medicine National Taiwan University Taipei Taiwan Research Center for Developmental Biology and Regenerative Medicine National Taiwan University Taipei Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering Taipei Medical University Taipei Taiwan

Posterior capsule opacification (PCO) is a predominant postoperative complication, often leading to visual impairment due to the aberrant proliferation and adhesion of lens epithelial cells (LECs) and protein precipitates subsequent to intraocular lens (IOL) implantation. To address this clinical issue, a foldable and antifouling sharp-edged IOL implant based on naturally-derived cellulose hydrogel is synthesized. The mechanical strength and transparency of the hydrogel is enhanced via repeated freeze-thaw (FT) cycles. The incorporated zwitterionic modifications can remarkably prevent the incidence of PCO by exhibiting proteins repulsion and cell anti-adhesion properties. The graft of dopamine onto both the haptic and the periphery of the posterior surface ensures the adhesion of the hydrogel to the posterior capsule and impedes the migration of LECs without compromising transparency. In in vivo study, the zwitterionic modified foldable hydrogel exhibits uveal and capsular biocompatibility synchronously with no signs of inflammatory response and prevent PCO formation, better than that of commercialized and PEG-modified IOL. With foldability, endurability, antifouling effect, and adhesive to posterior capsule, the reported hydrogel featuring heterogeneous surface design displays great potential to eradicate PCO and attain post-operative efficacy after cataract surgery. © 2024 Elsevier Ltd

关键词： Hydrogels

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Efficient thermo-optic micro-ring phase shifter made of PECVD silicon-rich amorphous silicon carbide

arXiv

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arXiv 2022年

作者： Chang, Li-Yang Sunny Pappert, Steve Yu, Paul K.L. Materials Science and Engineering Program The Department of Mechanical and Aerospace Engineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Department of Electrical & Computer Engineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States

In this work, the thermo-optic coefficient (TOC) of the silicon-rich amorphous silicon carbide (a-SiC) thin film deposited by plasma-enhanced chemical vapor deposition is characterized. We found that the TOC of the film increases as its silicon content increases. A more than three-fold improvement in the TOC is measured, reaching a TOC as high as 1.88 × 10−4 ℃−1, which is comparable to that of crystalline silicon. An efficient thermo-optic phase shifter has also been demonstrated by integrating the silicon-rich a-SiC micro-ring structure with a NiCr heater. Its tuning efficiency Pπ as low as 4.4 mW has been measured at an optical wavelength of 1550 nm. These findings make silicon-rich a-SiC a good material candidate for thermo-optic applications in photonic integrated circuits. Copyright © 2022, The Authors. All rights reserved.

关键词： Silicon carbide

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