检索结果-内蒙古大学图书馆

Porphyrin-Grafted Poly(ethylene terephthalate) as a Reusable and Highly Selective Colorimetric Probe for Mercuric Ion Contaminants in Aqueous Samples

引用

ACS Applied materials and Interfaces 2024年第30期16卷 39195-39205页

作者： Atayde, Eduardo C. Takenaka, Yasumasa Abe, Hideki Wu, Ming-Rou Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Department of Chemistry National Tsing Hua University Department of Chemical Engineering National Taiwan University Bioplastic Research Team RIKEN Center for Sustainable Resource Science Department of Chemical Engineering and Materials Science Yuan Ze University Department of Chemical Engineering Chung Yuan Christian University

Heavy metals are the most hazardous water pollutants, with severe health and environmental consequences. Among these, mercuric (Hg2+) ions are known to cause detrimental health issues in both humans and aquatic life. ... 详细信息

Heavy metals are the most hazardous water pollutants, with severe health and environmental consequences. Among these, mercuric (Hg²⁺) ions are known to cause detrimental health issues in both humans and aquatic life. Due to this, several analytical techniques have been devised to detect and quantify the amount of this ion. However, most of these require advanced instrumentation, prolonged analysis time, and sample preparation. In this study, a low-cost and highly reusable colorimetric probe was developed by grafting porphyrin to poly(ethylene terephthalate) sheets using an oxazoline polymer as covalent adhesive. Upon exposure to trace amounts of Hg²⁺ in solution, the fabricated material visually transitioned from faint brownish pink to green by the complexation mechanism. Additionally, the transparency of this probe allowed the quantitative spectrophotometric determination of the Hg²⁺ concentration in aqueous samples. It was also shown that the material is highly stable, which can be reused for more than 50 times without significant decline in its performance, hence, making it suitable for the onsite monitoring of mercuric ion contamination in different bodies of water. © 2024 The Authors. Published by American Chemical Society.

关键词： colorimetric probe mercuric ion oxazoline PET porphyrin

来源：评论

学校读者我要写书评

暂无评论

Production and characterization of fuel briquettes from banana leaves waste

引用

Chemical engineering Transactions 2014年 37卷 439-444页

作者： De Oliveira Maia, Bianca G. Souza, Ozair Marangoni, Cintia Hotza, Dachamir De Oliveira, Antonio Pedro N. Sellin, Noeli Graduate Program in Materials Science and Engineering - PGMAT Federal University of Santa Catarina 88040 900 Florianópolis-SC Brazil Masters in Process Engineering University of Joinville Region - UNIVILLE 89219 710 Joinville-SC Brazil

The use of agricultural and agro-industrial waste as biomass fuel for power generation like briquettes can be an alternative solution to the problems related at their disposal. Briquettes produced from lignocellulosic waste, through a simple process and low cost are an excellent source of cheap energy and environmentally correct, in many cases, ideal for replacing fossil fuels in use today, with significant economic and environmental advantages. The banana cultivation generates a significant amount of waste, but little used, it would be important to add value to them. In this work banana semi-dried leaves were crushed to particles with sizes between 2 and 5 mm and its moisture content was determined. The briquettes were produced in a hydraulic press with compaction pressure of 18 MPa and two different compression times and were evaluated by proximate and ultimate chemical analysis, high heating value (HHV), thermogravimetric analysis (TGA), differential thermal analysis (DTA), linear shrinkage, mechanical compressive strength, bulk and energy density. Briquettes presented moisture content of 7.2 %, high contents of carbon (44.3 %) and volatile matter (75.3 %), low sulphur and nitrogen contents and HHV of 17.7 MJ/kg. These results are similar for other biomass used to produce briquettes. Under combustion in TGA and DTA analysis, the briquettes showed high loss mass and maximum energy release between 200 and 500 °C. The mechanical compressive strength for 1 second compression was 5.3 MPa and the briquettes density was 0.99 g/cm3. The thermal properties and physicochemical characteristics of the banana leaves briquettes demonstrate its potential for use as biomass fuel. Copyright © 2014,AIDIC Servizi S.r.l.

关键词： Compressive strength

来源：评论

学校读者我要写书评

暂无评论

Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Rui Lin, Tong Luo, Jiaming Chen, Xiaotong Blackert, Elizabeth R. Moon, Alyssa R. JeBailey, Khalil M. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States Program Rice University Houston United States

ISBN: (纸本)9781957171258

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO3. We designed planar ultrafast concentrators that amplifies transient electric field by 6 times and measured an average field of 0.5 GV/m in an optically resolvable area in the far field. © 2023 The Author(s)

关键词： Perovskite

来源：评论

学校读者我要写书评

暂无评论

Detailed assessment of partial thermodynamic quantities of tin in molten Bi-Sn alloys from electromotive force measurements

引用

Metallurgical Transactions B 1990年第1期21卷 87-96页

作者： Cho, Seung-Am Camisotti, Roberto Vélez, Mariano H. Graduate Program of Metallurgy and Materials Science Venezuelan Institute of Scientific Research (IVIC) Caracas 1020A Apartado 21827 Venezuela School of Metallurgical Engineering and Materials Science Central University of Venezuela Caracas 1050A Apartado 50361 Venezuela Conduven Company Caracas Venezuela Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge 02139 MA United States

All the partial thermodynamic quantities, including the activity and activity coefficient of tin, a Sn and γSn, in the liquid Bi-Sn alloys between 300 °C and 500 °C are assessed in detail from electromotive...

All the partial thermodynamic quantities, including the activity and activity coefficient of tin, a_Sn and γ_Sn, in the liquid Bi-Sn alloys between 300 °C and 500 °C are assessed in detail from electromotive force (emf) data. The emf values were obtained from a modified molten salt electrolyte concentration cell that had extraordinary stability within +0.005 mV. The composition dependence of γ_Sn did not follow Darken's quadratic formalism, nor did the alloy behave as a regular solution. The excess partial quantities, Δ-H_Sn, Δ-S_Sn^xs, and Δ-G_Sn^xs, are oscillating across the composition, and the activity curve exhibits double, positive and negative, deviations from Raoult's law. The a_Sn, γ_Sn, and Δ-G_Sn^xs change from positive to negative departure from ideality in the tin-rich region beyond about x_Sn = 0.82. All those partial quantities and γ_Sn^o, including the β° (the α function of tin) at infinite dilution, are determined accurately by means of Chiotti's method. © 1990 The Minerals, Metals & Material Society.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Preparation of LFP-based cathode materials for lithium-ion battery applications

引用

materials Today: Proceedings 2022年 65卷 2347-2350页

作者： Suttison, Suchanat Pengpat, Kamonpan Intatha, Uraiwan Fan, Jinchen Zhang, Wei Eitssayeam, Sukum Master's Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai 57100 Thailand School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai 200093 China Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

Lithium-ion batteries (LIB) have developed into the mainstream power source of energy storage devices due to their advantages: high power density, high power, long service life, and less pollution. This materials development for LFP batteries was considered successful in synthesizing powder. Here we show that three synthesis conditions were performed. LFP doped NiO, NMC, and (NH4)2HPO4 were synthesized by the nitrogen gas flow method. LFP-doped NiO was burned at 600 °C and 700 °C for five h. NMC doped with LFP burned at 550 °C for five h, and NMC-doped LFP and (NH4)2HPO4 were burned at 550 °C and 600 °C for five h. The structure and morphology of the material were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). © 2022

关键词： Lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

DAMAGE TOLERANCE OF DOUBLE-DOUBLE LAMINATES 23

DAMAGE TOLERANCE OF DOUBLE-DOUBLE LAMINATES

引用

23rd International Conference on Composite materials, ICCM 2023

作者： Melo, Jose Daniel D. Cunha, Rayane D. Targino, Talita G. Freire Junior, Raimundo C.S. Ferreira, Evans P.C. Medeiros, Antonio M. Department of Materials Engineering Federal University of Rio Grande do Norte Natal Brazil Graduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte Natal Brazil SENAI Innovation Institute Natal Brazil

Double-double (DD) lay-up is a new configuration strategy for the design of composite laminates, which allows the use of simplified stacking sequences that leads to potential advantages, such as improved manufacturability and design optimization, as compared to traditional quadriaxial laminates (Quad), which are limited to ply angles of 0°, ±45° and 90°. With the double-double concept, through-the-thickness homogenization is facilitated using thinner sub-laminates and, consequently, profile optimization through thickness tapering becomes possible. In this work, damages after impact and after CAI tests of a double-double laminate (+50/0/-50/0)10 and a hard conventional laminate of equivalent in-plane stiffness (03/90/±45/02/±45)2S are compared. According to the data presented, maximum delaminated areas were of the same order of magnitude for the quad and for the DD laminates, under both conditions: after impact and after CAI tests. The results contribute to the understanding of potential benefits of the double-double concept to damage resistance and damage tolerance of composite laminates. © 2023 International Committee on Composite materials. All rights reserved.

关键词： Damage tolerance

来源：评论

学校读者我要写书评

暂无评论

Study on sintering and hardness of 316L stainless steel reinforced with tantalum carbide

Study on sintering and hardness of 316L stainless steel rein...

引用

European Powder Metallurgy Congress and Exhibition, Euro PM 2007

作者： Gomes, U.U. Soares, S.R.S. Furukava, M. Oliveira, L.A. Souza, C.P. Federal University of Rio Grande do Norte - UFRN Materials Science and Engineering Pos-Graduate Program Campus Universitário 59072-970 Natal RN Brazil

ISBN: (纸本)9781899072293

The present study investigates the behavior of the sintering and micro-hardness of stainless steel samples reinforced with nanoparticles of tantalum carbide (TaC). The main aim was to identify the effect of the dispersion of carbides over the microstructure and the mechanical properties of the compacts. Samples of AISI 316L pure and with the addition of 3% wt TaC were cold compacted in a cylindrical steel die (Ø = 5.0 mm) at 700 MPa and sintered in a vacuum furnace. The heating rate and sintering temperature used were 20°C/min and 1290°C respectively during 60 minutes. The results show that the carbides distribution increases the sintering kinetics and micro-hardness of the samples. We have been able to produce sintered samples with a relative density between 91.0% and 93.0%. The highest micro-hardness values using a 10N load were 115 HV for the reinforced sample and 76 HV for the sample without reinforcement.

关键词： Sintering

来源：评论

学校读者我要写书评

暂无评论

Exploring the Correlation Between Surface Roughness, Surface Energy, Nano-indentation, Electrical Properties, and Magnetic Characteristics of Annealed Co40Fe40Dy20 Thin Films Deposited on Si(100) Substrates

引用

Journal of Electronic materials 2024年第8期53卷 4498-4511页

作者： Liu, Wen-Jen Chang, Yung-Huang Hsu, Shuo-Ting Fern, Chi-Lon Chen, Yuan-Tsung Tsao, Shin-Ying Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

The impact of film thickness and annealing temperature on the structural, electrical, magnetic, and mechanical properties of cobalt–iron–dysprosium (Co40Fe40Dy20 ) thin films deposited on Si(100) substrates have been investigated. X-ray diffraction (XRD) analysis confirmed the film's crystalline microstructure, featuring dysprosium oxide, Dy2O3(440), and cobalt oxide, Co2O3(422) and Co2O3(511), crystallographic phases. Surface energy measurements indicated a noticeable reduction in surface energy following annealing treatments, which could be ascribed to the alleviation of residual stress and enhanced atomic arrangement, resulting in a more stable film structure with reduced surface energy. The film exhibited a decreasing trend in hardness with increasing thickness, and film resistivity was significantly responsive to alterations in thickness and annealing temperature. Notably, the Co40Fe40Dy20 film demonstrated exceptional characteristics, featuring a high saturation magnetization (Ms) of 675 emu/cm3 and a low coercivity (Hc) of 9.5 Oe. Further analysis of magnetic domains and hysteresis loops revealed that larger and brighter domains were associated with higher Hc. To sum up, the surface roughness of CoFeDy films under various annealing temperatures played a pivotal role in shaping their magnetic, electrical, adhesive, and optical characteristics. An improved low-frequency alternating current magnetic susceptibility (χac) value was achieved by minimizing the pinning effect on domain walls through surface smoothing. Moreover, smoother surfaces displayed heightened carrier conductivity, resulting in a decrease in electrical resistance. On the whole, Co40Fe40Dy20 films exhibited outstanding soft magnetic properties, encompassing high saturation magnetization, low coercivity, exceptional mechanical attributes, and decreased surface energy. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Magnetic susceptibility

来源：评论

学校读者我要写书评

暂无评论

Impact of selective ablation of self-assembly monolayer by localized Joule heating on silicon nanoelectronic sensors

Impact of selective ablation of self-assembly monolayer by l...

引用

IEEE SENSORS

作者： H. H. Liu T. H. Lin J. -T. Sheu Department of Materials Science and Engineering Graduate Program for Nanotechnology Taiwan

ISBN: (纸本)9781457717666

Silicon nanodevice biosensors have been attracted a lot of attention due to its advantages of label-free, real-time and very high sensitive detection. This study employs self-assembly monolayer (SAM) of methoxy-poly(ethyleneglycol) silane (MPEG-sil) as passivation on Si nanodevices. Ablation of SAM by Joule heating (JH) was performed at n - region of a nanobelt device, where the linker molecules, biotin were modified subsequently. Detection of Alexa dye-labeled Streptavidin (SA) showed that the fluorescence intensity at n - region increased with each 50-μl SA injection and saturated after the 4 th injection. A difference of fluorescence intensity between SAM-ablated device and without passivation is 4.9 fold. Threshold voltage (V th ) shifted ca. 35 mV after the 4 th injection for SAM-ablated device and as-fabricated device exhibited only a 10-mV V th shift. The results indicated that SAM-ablated device possess potential in reduction of sensing time and in increase of sensitivity for low concentration detection.

关键词： Nanoscale devices Fluorescence Nanobioscience Silicon Heating Surface treatment Biosensors

来源：评论

学校读者我要写书评

暂无评论

Surface morphology engineering of Cu for nanoscale strain control in graphene

引用

Surfaces and Interfaces 2025年 67卷

作者： Dong Jin Kim Cheolho Jeon Bo Hyeon Kim Jooyoung Yoon Seungryul Yoo Hwanuk Guim Yun Sung Woo Byung Hee Hong Joonhee Moon Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University AbsSeoul 08826 Republic of Korea Graphene Square Inc. Suwon 16229 Republic of Korea Research Center for Materials Analysis Korea Basic Science Institute Daejeon 34133 Republic of Korea Department of Materials Science and Engineering Dankook University Chungnam 3116 Republic of Korea Institute of Plasma Technology Korea Institute of Fusion Energy (KFE) Gunsan Jeollabuk-do 54004 South Korea Department of Chemistry Seoul National University Seoul 08826 Republic of Korea

The most promising method for synthesizing high-quality, large-scale graphene films involves chemical vapor deposition (CVD) of carbon-containing precursors onto Cu substrates. During graphene growth in a CVD system, the interaction between graphene and the Cu substrate leads to the formation of anisotropic Cu step bunches, driven by interfacial surface energy minimization and the release of compressive stress during thermal cooling. It is widely acknowledged that a smooth substrate is crucial for achieving high-quality graphene, as graphene strain and Cu surface roughening induce wrinkles when transferred onto a silicon wafer, which negatively impacts the quality. Here, we introduce a straightforward approach for controlling strain in graphene by engineering the Cu surface morphology through mechanical tension during the growth process. We achieve a uniform distribution of low compressive strain across the graphene layer by applying varying mechanical weights to the Cu foil. Using atomic force microscopy (AFM), scanning electron microscopy (SEM), and Raman spectroscopy, we demonstrate that mechanical tension significantly reduces Cu surface roughness, providing a smoother interface for graphene growth. This work provides insights into the relationship between Cu surface structure and graphene strain, contributing to the optimization of substrate preparation for graphene synthesis and other related surface engineering applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：