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Site-specific forest-assembly of single-wall carbon nanotubes on electron-beam patterned SiOx/Si substrates

Materials science and engineering C 2008年第8期28卷 1366-1371页

作者： Wei, Haoyan Kim, Sang Nyon Kim, Sejong Huey, Bryan D. Papadimitrakopoulos, Fotios Marcus, Harris L. Materials Science and Engineering Program Department of Chemical Materials and Biomolecular Engineering Institute of Materials Science Storrs CT 06269 United States Nanomaterials Optoelectronics Laboratory Polymer Program Institute of Materials Science Storrs CT 06269 United States

Based on electron-beam direct writing on the SiOx/Si substrates, favorable absorption sites for ferric cations (Fe3+ ions) were created on the surface oxide layer. This allowed Fe3+-assisted self-assembled arrays of single-wall carbon nanotube (SWNT) probes to be produced. Auger investigation indicated that the incident energetic electrons depleted oxygen, creating more dangling bonds around Si atoms at the surface of the SiOx layer. This resulted in a distinct difference in the friction forces from unexposed regions as measured by lateral force microscopy (LFM). Atomic force microscopy (AFM) affirmed that the irradiated domains absorbed considerably more Fe3+ ions upon immersion into pH 2.2 aqueous FeCl3 solution. This rendered a greater yield of FeO(OH)/FeOCl precipitates, primarily FeO(OH), upon subsequent washing with lightly basic dimethylformamide (DMF) solution. Such selective metal-functionalization established the basis for the subsequent patterned forest-assembly of SWNTs as demonstrated by resonance Raman spectroscopy. © 2008 Elsevier B.V. All rights reserved.

关键词： Chlorine compounds

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MXene:From synthesis to environment remediation

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Chinese Journal of chemical engineering 2023年第9期61卷 260-280页

作者： Ali Nikkhah Hasan Nikkhah Hadis langari Alireza Nouri Abdul Wahab Mohammad Ang Wei Lun Ng law Yong Rosiah Rohani Ebrahim Mahmoudi Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Department of Mechanical and Aerospace Engineering University at BuffaloBuffaloUSA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsUSA Department of Chemistry and Medicinal Chemistry University at BuffaloBuffaloUSA Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai LongKajangSelangorMalaysia

A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydrophilicity,large surface area,good mechanical stability,and *** 40 different MXenes have been synthesized,and dozens more structures and properties have been theoretically ***,the recent progress in MXenes development is not well covered in chronological order based on different *** review article focuses on emerging synthesis methods,the properties of MXenes,and mainly the applications of MXenes and MXene-based material family in environmental remediation,a comprehensive review of gaseous and aqueous pollutants treatment.

关键词： MXene 2D materials Wastewater treatment CO_(2)capture Adsorption Photodegradation

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Probe size effects on the microrheology of associating polymer solutions

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Physical Review E 2002年第6期66卷 061504-061504页

作者： Qiang Lu Michael J. Solomon Department of Chemical Engineering and Macromolecular Science and Engineering Program University of Michigan Ann Arbor Michigan 48109-2136

Diffusing wave spectroscopy has been used to investigate the thermally driven displacement of colloidal particles dispersed in solutions of associating polymers (APs). The effect of varying colloidal probe size on the measured particle displacements is studied in particular. Recent theories of microrheology are examined in light of the observed effects. The associating polymer used in this research was a linear polyethylene oxide (PEO) chain (molecular weight 35 000 g/mole) with a Cl14 aliphatic group appended to each end of the PEO. Above a critical concentration, the associating polymers display linear viscoelasticity consistent with the Maxwell model. The concentration of aqueous AP solutions was varied from 0.25 to 4.0 wt. %. At low concentration of APs, the mean square displacement of the colloidal beads was indistinguishable from simple Brownian diffusion in the aqueous solvent. However, at concentrations greater than 0.5 wt. %, the mean square displacement differed from simple diffusion in a way that was found to be consistent with the Maxwell model linear viscoelasticity (LVE) of the AP solutions. Significantly, for the most concentrated solutions, as the probe particle size was varied from 0.3 to 2.2 μm, the observed mean square displacement deviated substantially from the generalized Stokes-Einstein behavior predicted by microrheological theories. Our experiments showed that these deviations could not be attributed to specific physicochemical interactions at the probe-matrix interface, since observed mean square displacements were independent of different probe surface chemistries studied. Moreover, this particle size effect was not observed in semidilute, high molecular weight PEO solutions (molecular weight 4.0×106g/mole). We concluded that possible effects of AP network compressibility and AP depletion at the probe surface could not account for the observed particle size effects. We examined recent reports of the structural heterogeneity in AP solutions

关键词： Colloids

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Immobilization of NiS nanoparticles on N-doped carbon fiber aerogels as advanced electrode materials for supercapacitors

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Nano Research 2016年第9期9卷 2747-2759页

作者： Youfang Zhang Lizeng Zuo Longsheng Zhang Jiajie Yan Hengyi Lu Wei Fan Tianxi Liu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University220 Handan RoadShanghai 200433China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620China

NiS nanoparticles (NPs) with excellent electrochemical capacitance have attracted considerable attention as cost-effective energy-storage materials for supercapacitors in recent years. Preventing the aggregation and increasing the conductivity of NiS NPs are key to fully realizing their excellent electrochemical properties. In this work, NiS/N-doped carbon fiber aerogel (N-CFA) nanocomposites were obtained easily through the combination of polymerization, carbonization, and a one-step solvothermal reaction. N-CFA derived from polydopamine (PDA)-coated cotton wool was used as a template for the construction of hierarchical NiS/N-CFA nanocomposites, in which NiS NPs are uniformly immobilized on the surface of N-CFA. In this nanostructured system, N-CFA containing abundant nanofibers not only provides active regions for the growth of NiS NPs to prevent their aggregation, but also offers short pathways for the transport of electrons and ions. The electrochemical properties of the obtained NiS/N-CFA nanocomposites were investigated by cyclic voltammetry, galvanostatic charge–discharge, and alternating current impedance measurements. The optimized NiS/N-CFA nanocomposite exhibits a high specific capacitance of 1,612.5 F·g1at a charge/discharge current density of 1 A·g1and excellent rate capacitance retention of 66.7% at 20 A·g1. The excellent electrochemical properties of NiS/N-CFA nanocomposites make these materials promising electrode materials for supercapacitors. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： NiS cotton wool carbon fiber aerogels N-doping supercapacitors

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Promotional effects of Ru and Fe on Ni/ZrO_(2) catalyst during CO_(2) methanation:A comparative evaluation of the mechanism

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Journal of Energy Chemistry 2023年第11期86卷 351-361,I0008页

作者： Jie Ren Feng Zeng Chalachew Mebrahtu Zhandong Wang Regina Palkovits Institute for Technical and Macromolecular Chemistry RWTH Aachen UniversityWorringerweg 252074 AachenGermany Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHeifei 230026AnhuiChina State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029AnhuiChina

Ni-based catalysts are widely investigated non-noble metal-based systems for CO_(2)***,their industrial application is still limited due to lower activity at low-temperature and catalyst *** a second metal such as Ru and Fe is considered as a successful strategy to overcome these challenges through alloy formation or the synergies provided by the interplay of two adjacent metallic ***,their promotional effect on the CO_(2)methanation mechanism under similar conditions has not been reported *** this work,Fe and Ru-promoted Ni/ZrO_(2)catalysts were investigated to evaluate their promotional effect on the *** Ni/Fe ratio was first optimized and a CO_(2)conversion rate of 37.7 mmolCO_(2)/(molNi+Fes)and 96.3%CH^(4)selectivity was obtained over the Ni_(0.8)Fe_(0.2)/ZrO_(2)*** comparison with Ni_(0.8)Fe_(0.2)/ZrO_(2),Ni_(0.8)Ru_(0.2)/ZrO_(2)prepared with the same composition showed higher activity and stability in CO_(2)*** results indicate alloys formation and H spillover for Ni_(0.8)Ru_(0.2)/ZrO_(2)to be responsible for ***,in situ DRIFTS studies evidenced the occurrence of both CO_(2)dissociative and associative pathways over Ni_(0.8)Ru_(0.2)/ZrO_(2)catalyst,while solely the CO_(2)associative pathway occurred for Ni_(0.8)Fe_(0.2)/ZrO_(2)

关键词： Ni-based catalyst Alloy formation H spillover CO_(2) methanation Methanation mechanism

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Interfacial reactions in the Sn-9.0 wt.% Zn/Cu-Ti alloy (C1990 HP) couple

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Soldering and Surface Mount Technology 2024年第1期36卷 30-38页

作者： Laksono, Andromeda Dwi Chen, Chih-Ming Yen, Yee-Wen Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Chemical Engineering National Chung Hsing University Taichung Taiwan Study Program of Material and Metallurgical Engineering Institut Teknologi Kalimantan Balikpapan Indonesia

Purpose: The purpose of this study was to examine the influence of adding a small amount of Ti to a Cu-based alloy, specifically the commercial Hyper Titanium Copper alloy (C1990 HP), which contains Cu-3.28 wt.% Ti, on its interfacial reaction with Sn-9.0 wt.% Zn (SnZn) solder, using the liquid/solid reaction couple technique. Design/methodology/approach: The SnZn/C1990 HP couples were subjected to a reaction temperature of 240–270°C for a duration of 0.5–5 h. The resulting reaction couple was characterized using a scanning electron microscope, energy dispersive spectrometer, electron probe microanalyzer and X-ray diffractometer. Findings: It was observed that the scallop-shaped CuZn5 and planar Cu5Zn8 phases were formed in almost all SnZn/C1990 HP couples. With increased reaction duration and temperature, the Cu-rich intermetallic compound (IMC)-Cu5Zn8 phase became a dominant IMC formed at the interface. The total thickness of the IMCs was increased with the increase in the reaction duration and temperature. The IMC growth obeyed the parabolic law, and the IMC growth mechanism was diffusion controlled. The activation energy of the SnZn/C1990 HP couple was 64.71 kJ/mol. Originality/value: This article presents an analysis of the IMC thickness in each sample using ImageJ software, followed by kinetic analysis using Origin software at various reaction temperatures of SnZn/C1990 HP in liquid/solid couples. The study also includes detailed reports on the morphology, interface composition and X-ray diffraction analysis, as well as the activation energy. The findings can serve as a valuable reference for electronic packaging companies that utilize C1990 HP substrates. © 2023, Emerald Publishing Limited.

关键词： Binary alloys

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Facile synthesis of large-area ultrathin two-dimensional supramolecular nanosheets in water

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Nano Research 2020年第3期13卷 868-874页

作者： Bojian Hu Peiyi Wu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceLaboratory far Advanced MaterialsFudan UniversityShanghai 200433China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyCenter for Advanced Low-Dimension MaterialsDonghua UniversityShanghai 201620China

Synthesizing large-area ultrathin two-dimensional(2D)nanostructures in aqueous media has received considerable increasing attention but remains a big ***,we report a facile method for the synthesis of two unprecedented large-area ultrathin 2D supramolecular nanosheets via ionic self-assembly in *** consideration of electrostatic interaction and repulsive effect,deprotonated tetrakis(4-carboxyphenyl)porphyrin(TCPP)or Fe(III)tetra(4-carboxyphenyl)porphine chloride(TCPP(Fe))as connection vertex and protonated bis(2-dimethylaminoethyl)ether(BDMAEE)unit as bridging edge connect with each other to form few-layer 2D nanosheet with a thickness of^1.8–1.9 nm,while the lateral size can close to one hundred ***,the well-dispersed 2D TCPP(Fe)-BDMAEE with heme-like active center displays intrinsic peroxidase-like catalytic activity,which can be used to detect hydrogen *** present facile strategy highlights new opportunities in constructing large-area ultrathin 2D supramolecular nanomaterials and paves the avenue to expand their potential applications.

关键词： large-area ultrathin two-dimensional supramolecular nanosheets peroxidase-like catalytic activity

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Multilayer nanocoatings for gas barrier and fire protection

Multilayer nanocoatings for gas barrier and fire protection

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24th Annual Conference on Recent Advances in Flame Retardancy of Polymeric Materials 2013

作者： Grunlan, Jaime C. Department of Mechanical Engineering Department of Chemical Engineering and Materials Science and Engineering Program Texas A and M University United States

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Au(Ⅰ)-BSA nanocomposites with assembling-induced excitation-dependent multicolor emission for dynamic cell imaging

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science China Chemistry 2023年第1期66卷 174-184页

作者： Xuejuan Wang Guofeng Liu Kuo Fu Xuping Li Mengting Yao Qinghua Lu Liangliang Zhu Xiang Ma Shanghai Key Laboratory of Chemical Assessment and Sustainability Advanced Research Institute School of Chemical Science and EngineeringTongjiUniversityShanghai200092China Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Scienceand TechnologyShanghai 200237China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University Shanghai 200438China

Excitation wavelength dependent(Ex-De) luminescent materials have attracted intense attention due to their great potential in multicolor bioimaging,dynamic anti-counterfeiting,and light emitting ***,it remains a formidable challenge to construct an Ex-De luminescent biomaterial with green starting materials,excellent biocompatibility,good water solubility,and multiple color emission for dynamic cell *** this work,nanocomposites based on the facile self-assembly strategy of bovine serum albumin(BSA) and Au(Ⅰ)-complex are rationally designed and synthesized to simultaneously present Ex-De fluorescence(429–516 nm) and decent phosphorescence(~615 nm) in a dilute aqueous *** analyses of spectroscopic and microscopic results reveal that the luminescent mechanism of Au(Ⅰ)-BSA nanocomposites is cluster-induced Ex-De fluorescence and metal-to-ligand charge transition(MLCT) based ***,based on the excellent biocompatibility,water-solubility and color-tunable emission over the entire visible region(360–800 nm),the Au(Ⅰ)-BSA nanocomposites are successfully used for cell imaging with multiple and switchable colors on *** is more,the solid tablets of Au(Ⅰ)-BSA nanoparticles showed pressure-responsive luminescence and decent room temperature *** work provides an assembling-induced emission strategy for the design of water-soluble,non-cytotoxic,and color-tunable luminescent biomaterials based on the composite of protein and Au nanoparticles.

关键词： nanocomposites excitation wavelength-dependent emission room temperature phosphorescence assembling-induced emission dynamic cell imaging

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Biochar supported metal cobalt activated PAA to efficiently degrade CBZ: The important role of Co (IV) in the generation of peroxyacyl radicals

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Journal of Water Process engineering 2025年 75卷

作者： Mengyu Li Shaochun Yuan Yuhang Liu Siqi Chen Mingyang Si Rong Liu Bangxing Ren Zhe Zhang Zhen Liu School of River and Ocean Engineering Chongqing Jiaotong University Chongqing 400074 China Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission Chongqing Jiaotong University Chongqing 400074 China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering (ChEE) University of Cincinnati Cincinnati OH 45221-0071 USA

This study utilized biochar-supported transition metal cobalt as a model catalyst to activate peracetic acid (PAA) for carbamazepine (CBZ) degradation. The acetyl peroxyl radical (CH 3 (CO)OO•) was identified as the predominant reactive oxygen species (ROS) responsible for CBZ degradation in this system, with its generation primarily facilitated by the catalytic activation of PAA mediated by high-valent cobalt species [Co(IV)]. The generation of Co(IV) species occurs via PAA-mediated stepwise single-electron oxidation of Co(II). Comprehensive characterization techniques (SEM, XRD, FTIR, XPS) demonstrated that cobalt-modified biochar (Co@BC 700°C ) exhibits a layered structure with increased surface area and numerous functional groups. The incorporation of cobalt simultaneously increases active site density and optimizes electron transfer efficiency within the BC. As a result, Co@BC 700°C activated PAA achieved efficient degradation of CBZ within 10 min under weakly acidic conditions. The comprehensive free radical investigation experiments collectively demonstrated that CH 3 (CO)OO• as the dominant reactive species driving CBZ degradation. Meanwhile, chemical trapping experiments confirmed that Co(IV) species significantly influence the degradation of CBZ, and the primary role of Co(IV) species is to mediate the generation of CH 3 (CO)OO• via electron transfer mechanisms. Furthermore, integrated toxicological assessments and circulation experiments verified the catalytic potential of Co@BC 700°C , demonstrating sustained removal efficiency in complex aqueous environments containing competitive anions and natural organic species. The results of this study provide innovative understanding of CH 3 (CO)OO• formation through Co(IV)-activated PAA catalysis, as well as a unique viewpoint on applying PAA-driven advanced oxidation technologies for wastewater treatment.

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