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Hydroformylation over polyoxometalates supported single-atom Rh catalysts

National science Open 2023年第2期2卷 161-174页

作者： Shixiang Feng Qi Yu Xinbin Ma Xiaohu Yu Ning Yan Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China School of Materials Science and Engineering Shaanxi Laboratory of CatalysisShaanxi University of TechnologyHanzhong 723001China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Department of Chemical&Biomolecular Engineering National University of SingaporeSingapore 117580Singapore

Atomic dispersion of Rh on phosphotungstic acid(PTA)salts was achieved by a self-assembled precipitation method using alkali metal ions as coprecipitation *** styrene hydroformylation,the supported Rh single-atom catalyst(Rh1/M-PTA,M refers to an alkali metal ion)demonstrated an optimum turnover frequency(TOF)of 1076 h−*** increasing ionic radius,the pore size of the catalysts increased in the following order:Rh1/K-PTA

关键词： polyoxometalates Rh single-atom hydroformylation self-assembly styrene

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Spinodal decomposition:a new approach to hierarchically porous inorganic materials for energy storage

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National science Review 2020年第11期7卷 1635-1637页

作者： Seongseop Kim Jinwoo Lee Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST)

Hierarchically inorganic porous materials exhibit porosity on two or more distinct length scales, and therefore combine the benefits of the different pore sizes, which is highly desirable in a variety of applications in catalysis, separation and energy storage [1]. The macropores provide large diffusion pathways for rapid mass transfer and reservoirs for mass-buffering, and mesopores and micropores provide a high surface area [2].

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Effect of physical and biological pretreatment on sugarcane bagasse waste-based biogas production

Effect of physical and biological pretreatment on sugarcane ...

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3rd International Conference on chemical engineering and Applied sciences, ICChEAS 2022

作者： Sumardiono, Siswo Matin, Hashfi Hawali Abdul Sulistianingtias, Ihdina Nugroho, Tri Yulianto Budiyono, Budiyono Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang50239 Indonesia Study Program of Environmental Science Faculty of Mathematic and Natural Science Universitas Sebelas Maret Surakarta57126 Indonesia Vocational School Universitas Diponegoro Semarang50239 Indonesia

Sugarcane bagasse is a biomass with very potential, especially in agricultural countries. In this research, a study related to pretreatment and the ratio of C/N to biogas production from sugarcane bagasse was conducted. The study was carried out on a laboratory scale with physical pretreatment by grinding with a size of 6 mesh, then biological pretreatment with the microbial consortium 5 % g/V, and variations in the C/N ratio at 25 and 30. Cow rumen fluid was used in this study as a source of anaerobic bacteria and technical urea is used to adjust the C/N ratio. The solid total is set at 7 %. Based on research that has been carried out for 60 days, it was found that physical pretreatment by grinding with a size of 6 mesh can increase biogas production. Biogas production increased both at C/N ratio conditions of 25 and 30. Furthermore, biological pretreatment with the microbial consortium 5 % g/V was proven to increase biogas production at both C/N ratios of 25 and 30. Further studies on the C/N ratio, it was found that the C/N ratio of 25 was better than the C/N ratio of 30. This is evident in several variables, including raw and fine substrate conditions, as well as on variables with or without a microbial consortium, with the amount of biogas productivity at a C/N 25 ratio of 53-90.5 % higher than the C/N 30 ratio. © 2023 Elsevier Ltd. All rights reserved.

关键词： Grinding (machining)

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Electrical anisotropy in two-dimensional reduced graphene oxide/polypyrrole-based ordered conjugated system ensure multi-stimulus response signal adapter

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science China Materials 2024年第12期67卷 3966-3975页

作者： Yuqiao Chai Ruoqi Chen Xinlei Ma Yonglin He Huanrong Zhang Tianlai Xia Jitao Chen Yushu Wang Hui Ma Xusheng Wang Wei Rao Xinyue Zhang Yapei Wang Junhui Ji Fengwang Li Mianqi Xue Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China College of Material Science and Chemical Engineering Ningbo University of TechnologyNingbo 315211China Department of Chemistry Renmin University of ChinaBeijing 100872China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China Qingdao Innovation and Development Center Harbin Engineering UniversityQingdao 266400China School of Chemical and Biomolecular Engineering The University of SydneyNew South Wales 2006Australia

Electronic technology,based on signal conversion induced by voltage stimulation,forms the core foundation of the state-of-the-art intelligent devices,tools,and *** conversions are inherently binary and limited because they rely solely on voltage,which presents challenges for many emerging frontier ***,a two-dimensional ordered conjugated system of reduced graphene oxide/polypyrrole(rGO/PPy)has been ***-stimulus response signal adapters have been constructed,utilizing the electrical anisotropy inherent in the rGO/PPy *** electrical anisotropy,derived from the quasi-two-dimensional geometry of rGO/PPy,enables the device to produce distinct electrical signals in response to various *** effective responses to light and pressure,the two most common input stimuli other than voltage,it can output quaternary/denary signals and visual optical signals,as well as enables information encryption using passive ***,the signal adapter demonstrates high cyclic stability under repeated pressure and/or light *** successful development of this low-cost,scalable signal adapter paves the way for the next-generation of intelligent systems,promising advancements in human-computer interaction,electronic skin,biological implant equipment,and related fields.

关键词： electrical anisotropy signal adapters polypyrrole graphene two-dimensional conjugated system

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Evaluating a Liquid-Phase Plasma Discharge Process for Ammonia Oxidation in Wastewater

Evaluating a Liquid-Phase Plasma Discharge Process for Ammon...

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2023 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2023

作者： Aka, Robinson Junior Ndeddy Mohotti, Dinithi Nasir, Alia Agyekum-Oduro, Ekow Wu, Sarah Environmental Science Program University of Idaho MoscowID83844 United States Department of Chemical and Biological Engineering University of Idaho MoscowID83844 United States

ISBN: (纸本)9781713885887

In this study, a novel continuous flow liquid-phase plasma process was evaluated to remove NH3-N from synthetic wastewater. The process was optimized and modelled using response surface methodology (RSM). The Box-Behnken experimental design was used to determine the effects and optimal conditions of key operating parameters, including the initial NH3-N concentration (50-200 mg/L), power input (150-300 W), and gas-flow rate (1.5-2.5 L/min) for efficient NH3-N removal from wastewater samples. The gas-flow rate and power input were found to be the most significant factors affecting the removal efficiency of NH3-N, whereas the initial concentration of NH3-N played a crucial role in determining the energy efficiency of the process. Under optimal conditions of an initial NH3-N concentration of 200 mg/L, applied power of 223 W, and gas-flow rate of 2.4 L/min, 98.91% of NH3-N could be removed with N2 selectivity of 92.91%, and the corresponding energy efficiency was 0.527g/kWh after 2 hrs of treatment. A small fraction of undesirable NO3 (35.03 mg/L) and NO2 (6.5 mg/L) were also produced. Optical emission spectroscopy (OES) has revealed the presence of several highly oxidative radicals, including ‧OH, ‧O, and ‧O2+. These results demonstrate the potential of liquid phase plasma discharge as a highly efficient technology for removing ammonia from aqueous solutions. © 2023 ASABE Annual International Meeting. All Rights Reserved.

关键词： Flow of gases

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BO4IO: A Bayesian optimization approach to inverse optimization with uncertainty quantification

arXiv

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arXiv 2024年

作者： Lu, Yen-An Hu, Wei-Shou Paulson, Joel A. Zhang, Qi Department of Chemical Engineering and Materials Science University of Minnesota MinneapolisMN55455 United States Department of Chemical and Biomolecular Engineering The Ohio State University ColumbusOH43210 United States

This work addresses data-driven inverse optimization (IO), where the goal is to estimate unknown parameters in an optimization model from observed decisions that can be assumed to be optimal or near-optimal solutions to the optimization problem. The IO problem is commonly formulated as a large-scale bilevel program that is notoriously difficult to solve. Deviating from traditional exact solution methods, we propose a derivative-free optimization approach based on Bayesian optimization, which we call BO4IO, to solve general IO problems. We treat the IO loss function as a black box and approximate it with a Gaussian process model. Using the predicted posterior function, an acquisition function is minimized at each iteration to query new candidate solutions and sequentially converge to the optimal parameter estimates. The main advantages of using Bayesian optimization for IO are two-fold: (i) it circumvents the need of complex reformulations of the bilevel program or specialized algorithms and can hence enable computational tractability even when the underlying optimization problem is nonconvex or involves discrete variables, and (ii) it allows approximations of the profile likelihood, which provide uncertainty quantification on the IO parameter estimates. We apply the proposed method to three computational case studies, covering different classes of forward optimization problems ranging from convex nonlinear to nonconvex mixed-integer nonlinear programs. Our extensive computational results demonstrate the efficacy and robustness of BO4IO to accurately estimate unknown model parameters from small and noisy datasets. In addition, the proposed profile likelihood analysis has proven to be effective in providing good approximations of the confidence intervals on the parameter estimates and assessing the identifiability of the unknown parameters. Copyright © 2024, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Facile synthesis of ironenickelecobalt ternary oxide(FNCO)mesoporous nanowires as electrode material for supercapacitor application

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Journal of Materiomics 2022年第1期8卷 221-228页

作者： Muhammad Usman Muhammad Tayyab Ahsan Sofia Javed Zeeshan Ali Yiqiang Zhan Irfan Ahmed Sajid Butt Mohammad Islam Asif Mahmood M.Aftab Akram School of Chemical and Materials Engineering National University of Sciences and Technology(NUST)Sector H-12Islamabad44000Pakistan Department of Materials Science and Engineering College of EngineeringPeking University100871BeijingChina State Key Laboratory of ASIC and System Center of Micro-Nano SystemSISTFudan UniversityShanghai200433China Department of Materials Science and Engineering Institute of Space TechnologyIslamabad44000Pakistan New Mexcico Institute of Mining&Technology SocorroNM 87801USA School of Chemical and Biomolecular Engineering The University of Sydney2006SydneyAustralia

Transition Metal Oxides have drawn significant attention due to their reversible chemical redox reaction and long-life *** agglomeration and shrinkage/expansion of transition metal oxides in the nanosize regime have a noticeable effect on their electrochemical *** in this work,mesoporous nanowires(NWs)with a typical composition of iron-nickel-cobalt ternary oxide(FNCO)are synthesized using a simple,facile and cost-effective hydrothermal process followed by furnace *** NWs are then extensively investigated as an electrode material for supercapacitor *** compare the electrochemical properties,nanowires of nickel-cobalt oxide(NCO),iron-cobalt oxide(FCO)and cobalt oxide(CO)were also produced by following the same *** FNCO NWs are found to overcome the shortcomings in the electrochemical energy storage devices by exhibiting higher values of specific capacitance(2197 Fg^(-1))and energy density(109 Whkg^(-1))at 1 Ag^(-1) current ***,the FNCO NWs also showed a cyclic charge/discharge stability of 96%even up to 20,000 ***,a FNCO//graphene asymmetric device,fabricated with FNCO NWs and graphene as positive and negative electrodes,respectively,which exhibit high energy density(47 Whkg^(-1)),power density(375 Wkg^(-1))and excellent capacitance retention(86%)after 15,000 cycles.

关键词： Electrochemistry Hydrothermal synthesis Nanowires Supercapacitor Transition metal oxides

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3D bioprinting of engineered exosomes secreted from M2-polarized macrophages through immunomodulatory biomaterial promotes in vivo wound healing and angiogenesis

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Bioactive Materials 2025年第3期45卷 345-362页

作者： Sayan Deb Dutta Jeong Man An Jin Hexiu Aayushi Randhawa Keya Ganguly Tejal V.Patil Thavasyappan Thambi Jangho Kim Yong-kyu Lee Ki-Taek Lim Department of Biosystems Engineering Kangwon National University24341ChuncheonRepublic of Korea Institute of Forest Science Kangwon National University24341ChuncheonRepublic of Korea School of Medicine University of California Davis95817SacramentoUnited States Department of Bioengineering College of EngineeringHanyang University04763SeoulRepublic of Korea Department of Plastic and Traumatic Surgery Capital Medical University100069BeijingChina Interdisciplinary Program in Smart Agriculture Kangwon National University24341ChuncheonRepublic of Korea Graduate School of Biotechnology College of Life SciencesKyung Hee University17104YonginRepublic of Korea Department of Convergence Biosystems Engineering Chonnam National University61186GwangjuRepublic of Korea Department of Chemical and Biological Engineering Korea National University of Transportation27470ChungjuRepublic of Korea

Biomaterial composition and surface charge play a critical role in macrophage polarization,providing a mo-lecular cue for immunomodulation and tissue *** this study,we developed bifunctional hydrogel inks for accelerating M2 macrophage polarization and exosome(Exo)cultivation for wound healing *** this,we first fabricated polyamine-modified three-dimensional(3D)printable hydrogels consisting of algi-nate/gelatin/polydopamine nanospheres(AG/NSPs)to boost M2-exosome(M2-Exo)*** cultivated M2-Exo were finally encapsulated into a biocompatible collagen/decellularized extracellular matrix(COL@d-ECM)bioink for studying angiogenesis and in vivo wound healing *** findings show that 3D-printed AGP hydrogel promoted M2 macrophage polarization by Janus kinase/signal transducer of activation(JAK/STAT),peroxisome proliferator-activated receptor(PPAR)signaling pathways and facilitated the M2-Exo ***,the COL@d-ECM/M2-Exo was found to be biocompatible with skin ***(RNA-Seq)and real-time PCR(qRT-PCR)study revealed that co-culture of fibroblast/keratinocyte/stem cells/endothelial cells in a 3D bioprinted COL@d-ECM/M2-Exo hydrogel upregulated the skin-associated signature biomarkers through various regulatory pathways during epidermis remodeling and downregulated the mitogen-activated protein kinase(MAPK)signaling pathway after 7 *** a subcutaneous wound model,the 3D bioprinted COL@d-ECM/M2-Exo hydrogel displayed robust wound remodeling and hair follicle(HF)induction while reducing canonical pro-inflammatory activation after 14 days,presenting a viable therapeutic strategy for skin-related disorders.

关键词： Exosome Immunomodulation Decellularized extracellular matrix Skin bioprinting Angiogenesis Wound healing

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Controlling Long-Term Plasticity in Neuromorphic Computing Through Modulation of Ferroelectric Polarization

SSRN

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SSRN 2024年

作者： Lee, Donghwa Sung, Junho Kim, Minhui Kim, Na-Hyun Lee, Seonggyu Lee, Hee-Young Jeong, Dongyeong Lee, Eunho Department of Chemical Engineering Kumoh National Institute of Technology Gumi39177 Korea Republic of Department of Chemical and Biomolecular Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of

Electrolyte-gated transistors (EGTs) have significant potential for neuromorphic computing because they can control the number of ions by mimicking neurotransmitters. However, fast depolarization of the electrical double layer (EDL) makes it difficult to achieve long-term plasticity. Herein, we present a polyvinylidene fluoride (PVDF)-based ion-gel synaptic device using PVDF and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) to implement long-term plasticity (LTP) through the introduction of ferroelectric materials. The PVDF-based polymer slows the escape rate of TFSI anions from the electrolyte/channel layer through residual polarization. The fabricated synaptic device successfully implements synaptic functions including paired-pulse facilitation (PPF), high-pass filtering, neurotransmitter control, and LTP. To validate the potential of neuromorphic computing, we successfully achieved high recognition rates for artificial/convolutional neural network (A/CNN) simulations via sequential adsorption and desorption under ferroelectric polarization with long-term potentiation/depression (LTP/D). This study provides a rational ion adsorption strategy utilizing the ferroelectric polarization caused by the introduction of a PVDF-based polymer in the dielectric layer. © 2024, The Authors. All rights reserved.

关键词： Electrolytes

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Disturbing cytoskeleton by engineered nanomaterials for enhanced cancer therapeutics

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Bioactive Materials 2023年第11期29卷 50-71页

作者： Xueli Xu Shanbin Xu Jipeng Wan Diqing Wang Xinlong Pang Yuan Gao Nengyi Ni Dawei Chen Xiao Sun School of Science Shandong Jianzhu UniversityJinan250101China Shandong Cancer Hospital and Institute Shandong First Medical University and Shandong Academy of Medical SciencesJinan250117China Department of Gynecology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan250021China School of Chemistry and Pharmaceutical Engineering Medical Science and Technology Innovation CenterShandong First Medical University&Shandong Academy of Medical SciencesJinan250000China Department of Chemical and Biomolecular Engineering National University of Singapore117585Singapore

Cytoskeleton plays a significant role in the shape change,migration,movement,adhesion,cytokinesis,and phagocytosis of tumor *** clinical practice,some anti-cancer drugs achieve cytoskeletal therapeutic effects by acting on different cytoskeletal protein ***,in the absence of cell-specific targeting,unnecessary cytoskeletal recombination in organisms would be disastrous,which would also bring about severe side effects during anticancer *** have been proven to be superior to some small molecule drugs in cancer treatment due to better stability and targeting,and lower side ***,this review summarized the recent developments of various nanomaterials disturbing cytoskeleton for enhanced cancer therapeutics,including carbon,noble metals,metal oxides,black phosphorus,calcium,silicon,polymers,peptides,and metal-organic frameworks,etc.A comprehensive analysis of the characteristics of cytoskeleton therapy as well as the future prospects and challenges towards clinical application were also *** aim to drive on this emerging topic through refreshing perspectives based on our own work and what we have also learnt from *** review will help researchers quickly understand relevant cytoskeletal therapeutic information to further advance the development of cancer nanomedicine.

关键词： Nanomedicine Disturbing cytoskeleton Migration inhibition Tumor therapy

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