检索结果-内蒙古大学图书馆

17th Unified International Technical Conference on Refractories, UNITECR 2022

作者： Borges, O.H. dos Santos, T. Salvini, V.R. Pandolfelli, V.C. Federal University of Sao Carlos Graduate Program in Materials Science and Engineering SP Sao Carlos Brazil FIRE Associate Laboratory SP Sao Carlos Brazil Jordão Borghetti Street 480 SP Sertãozinho14160-050 Brazil

Aiming at reducing the remarkable shrinkage observed when porous ceramics are fired, the in-situ formation of hibonite (also known as CaO·6Al2O3 or CA6) was evaluated in a direct-foamed alumina-based macroporous thermal insulator with the addition of distinct calcium sources and contents. Among the tested compositions, that containing 12.9 wt% of CaCO3 showed promising results as high porosity (~ 80 %), no shrinkage after firing at 1600 ºC for 5 h, suitable mechanical strength, and a 200 ºC-lower strengthening temperature. However, the in-situ formation of CA6 took place just at high temperatures (~ 1600 ºC), implying a high energy consumption. To address this issue, SiO2, ZnO, and TiO2 were evaluated as mineralizing agents. The addition of 2.8 mol% of TiO2 induced CA6 formation at 1300ºC and low thermal conductivity (0.54 Wm-1K-1 at 1200 ºC), without significant changes in the refractoriness. © 2022 Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings. All rights reserved.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Production and characterisation of ceramic foams from industrial solid waste

引用

Chemical engineering Transactions 2015年 43卷 1783-1788页

作者： Zilli, Marina Arcaro, Sabrina Cesconeto, Francielly R. De Oliveira Maia, Bianca G. Pereira, Fabiano R. Novaes De Oliveira, Antonio P. Graduate Program in Materials Science and Engineering - PGMAT Laboratory of Glass-Ceramic Materials - VITROCER Federal University of Santa Catarina - UFSC Florianópolis-SC88040-900 Brazil

ISBN: (纸本)9788895608341

This work has as objective to produce and to characterize ceramic foams from glass bottles, sludge from sewage treatment station and graphite (0 - 10 wt%) as a foaming agent. Different compositions were formulated and prepared to obtain materials with controlled porosity for applications where thermal insulation is the main requirement. The raw materials of the prepared compositions were mixed and uniaxially pressed at 40 MPa. Subsequently, the prepared samples were dried and fired at different temperatures (800 - 950 °C) for 30 minutes, respectively. The raw materials and obtained ceramic foams were characterized in terms of their chemical, morphological, thermal and mechanical properties. The results showed that it is possible to produce ceramic foams for thermal insulation with optimized compositions containing 90 vol% glass and 10 vol% sludge with addition of 10 wt% graphite. The ceramic foams showed porosities between 40 and 70 %, thermal conductivity from 0.101 to 0.175 W/mK and compressive strength between 6.4 and 12.5 MPa. Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Thermal insulation

来源：评论

学校读者我要写书评

暂无评论

MgAl2O4 foams obtained by combustion synthesis

引用

Chemical engineering Transactions 2015年 43卷 1801-1806页

作者： Moraes, Graziela G. Pozzobom, Ida E.F. Fernandes, Celso P. Novaes De Oliveira, Antonio P. Graduate Program in Materials Science and Engineering - PGMAT Laboratory of Glass-Ceramic Materials - VITROCER Federal University of Santa Catarina - UFSC Florianópolis - SC88040 900 Brazil

ISBN: (纸本)9788895608341

This work aims to study magnesium aluminate (MgAl2O4) ceramic foams obtained by combustion synthesis in solution without the need of surfactants to stabilize *** ceramic suspension containing acetone (75 wt%), calcined powder (25 wt%) and a mixture of glycerine (80 % blonde glycerine and 20 % crude glycerine) in the fraction of 100 % with respect to solids was prepared in an alumina ball mill, for 60 min. Subsequently, the suspension was heated at 40 °C, for 30 min, until it became rigid. In order to promote foaming, the suspension was heated to 70 °C and then the following substances were added to it: 2.5 wt% distilled water, 25 wt% Al(NO3)3.9H2O), 12.5 wt% (Mg(NO3)2.6H2O) and 0.625 wt% of a glycerine mixture (80 % blonde glycerine and 20% crude glycerine). After additions the suspension was stirred for 5 min at 950 rpm in a mixer. The resulting foams were dried at 40 °C, for 24 h, in a muffle and fired in two steps, i.e., heating at 0.5 °C/min up to 600 °C/120 min and at 5 °C/min up to 1600 °C/120 *** obtained materials were characterized by SEM,TEM and from tomographic images. The results showed that the obtained magnesium aluminate foams have a high porosity (97 %), a high connectivity and pore sizes (diameters) between 30 and 1200 μm. Copyright © 2015, AIDIC ServiziS.r.l.

关键词： Pore size

来源：评论

学校读者我要写书评

暂无评论

Production and characterisation of glass foams for thermal insulation

引用

Chemical engineering Transactions 2015年 43卷 1777-1782页

作者： Dias, Gabriella M.V. Arcaro, Sabrina Cesconeto, Francielly R. De Oliveira Maia, Bianca G. Pereira, Fabiano R. Novaes De Oliveira, Antonio P. Graduate Program in Materials Science and Engineering - PGMAT Laboratory of Glass-Ceramic Materials - VITROCER Federal University of Santa Catarina - UFSC Florianópolis-SC88040-900 Brazil

ISBN: (纸本)9788895608341

In this work, glass compositions from glass bottles with different colours and graphite (2 - 12 vol%) as the pore-forming agent were prepared for the production of materials with controlled porosity for applications where thermal and acoustic insulations are main technical requirements. The formulated compositions were, in a later stage, uniaxially pressed (40 MPa) and fired at different temperatures (800 - 950 °C) and cycles with holding times between 15 and 120 minutes. The results showed that it is possible to produce glass foams for thermal insulation from optimized compositions containing 90 vol% glass and 10 vol% graphite, fired between 800 and 950 °C for 30 minutes, which showed porosities between 53 and 76 %, with thermal conductivities between 0.16 and 0.08 W/mK and compressive strength between 20 and 4.6 MPa. The obtained glass foams are strong candidates for applications requiring thermal insulation with suitable combination of thermal conductivity, porosity and mechanical strength. Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Thermal insulation

来源：评论

学校读者我要写书评

暂无评论

A case study on statistical characterization and optimization of coercivity in cobalt ferrite nanoparticles

A case study on statistical characterization and optimizatio...

引用

作者： Cedeño-Mattei, Y. Sánchez-Peña, M.L. Lara-Rodríguez, Y. Perales-Pérez, Ó. Cabrera-Ríos, M. Engineering Science and Materials Department University of Puerto Rico at Mayagüez Mayagüez Puerto Rico Industrial Engineering Department University of Puerto Rico Mayagüez Mayagüez 00681-9000 Puerto Rico Graduate Program in Systems Engineering University of Nuevo León Nuevo León Mexico

Characterization and optimization of material properties during synthesis and processing are frequent problems in materials science and engineering. In the present paper, the use of design of experiments (DOE) to characterize and improve coercivity in cobalt ferrite nanoparticles is described. The sequence of experiments was planned to capitalize on previous experimental runs available. Emphasis is placed on the rationale for choosing the additional runs. The results reveal that the choice of an adequate initial experimental design can save effort and resources in arriving at useful conclusions upon which subsequent experimental runs can be planned, capitalizing on the initial experimental structure. A region with attractive solutions in terms of coercivity, including a local maximum, was identified through the experimental sequences described in this case study. © 2011 Authors.

关键词： Design of experiments

来源：评论

学校读者我要写书评

暂无评论

Developing an atomic-level understanding of the mechanisms that govern CO2 sequestration mineral carbonation reaction processes

Developing an atomic-level understanding of the mechanisms t...

引用

2005 TMS Annual Meeting

作者： McKelvy, Michael J. Chizmeshya, Andrew V. G. Diefenbacher, Jason Béarat, Hamdallah Carpenter, R.W. Wolf, George Gormley, Deirdre Center for Solid State Science Arizona State University Tempe AZ 85287 United States Science and Engineering of Materials Graduate Program Arizona State University Tempe AZ 85287 United States Department of Chemistry and Biochemistry Arizona State University Tempe AZ 85287 United States

Mineral carbonation is an emerging CO2 sequestration candidate technology, which produces environmentally benign and geologically stable materials. The primary challenge is economically viable process development. Serpentine and olivine minerals are candidate feedstock materials of interest, due to their wide availability, low-cost, and rapid mineral carbonation potential. Cost-effectively enhancing their carbonation reactivity is critical to reducing mineral sequestration process cost. We will discuss our recent research into the mechanisms that govern serpentine and olivine mineral carbonation reaction processes, including in situ observations of the mineral carbonation process and a novel mechanistic approach to enhance carbonation reactivity that avoids the cost of mineral activation. Our goal is to develop the necessary atomic-level understanding to engineer improved carbonation materials and processes to reduce process cost.

关键词： Chemical reactions

来源：评论

学校读者我要写书评

暂无评论

Phase/Interfacial-Engineered Two-Dimensional-Layered WSe2 Films by a Plasma-Assisted Selenization Process: Modulation of Oxygen Vacancies in Resistive Random-Access Memory

引用

ACS Applied materials and Interfaces 2023年第28期15卷 33858-33867页

作者： Chaudhary, Mayur Shih, Yu-Chuan Tang, Shin-Yi Yang, Tzu-Yi Kuo, Tzu-Wen Chung, Chia-Chen Shen, Ying-Chun Anbalagan, Aswin kumar Lee, Chih-Hao Hou, Tuo-Hung He, Jr-Hau Chueh, Yu-Lun Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu30013 Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Department of Electronic Engineering National Yang Ming Chiao Tung University Hsinchu30013 Taiwan Department of Materials Science and Engineering City University of Hong Kong Hong Kong999077 Hong Kong Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei11492 Taiwan

Here, we propose phase and interfacial engineering by inserting a functional WO3 layer and selenized it to achieve a 2D-layered WSe2/WO3 heterolayer structure by a plasma-assisted selenization process. The 2D-layered WSe2/WO3 heterolayer was coupled with an Al2O3 film as a resistive switching (RS) layer to form a hybrid structure, with which Pt and W films were used as the top and bottom electrodes, respectively. The device with good uniformity in SET/RESET voltage and high low-/high-resistance window can be obtained by controlling a conversion ratio from a WO3 film to a 2D-layered WSe2 thin film. The Pt/Al2O3/(2D-layered WSe2/WO3)/W structure shows remarkable improvement to the pristine Pt/Al2O3/W and Pt/Al2O3/2D-layered WO3/W in terms of low SET/RESET voltage variability (−20/20)%, multilevel characteristics (uniform LRS/HRS distribution), high on/off ratio (104-105), and retention (∼105 s). The thickness of the obtained WSe2 was tuned at different gas ratios to optimize different 2D-layered WSe2/WO3 (%) ratios, showing a distinctive trend of reduced and uniform SET/RESET voltage variability as 2D-layered WSe2/WO3 (%) changes from 90/10 (%) to 45/55 (%), respectively. The electrical measurements confirm the superior ability of the metallic 1T phase of the 2D-layered WSe2 over the semiconducting 2H phase. Through systemic studies of RS behaviors on the effect of 1T/2H phases and 2D-layered WSe2/WO3 ratios, the low-temperature plasma-assisted selenization offers compatibility with the temperature-limited 3D integration process and also provides much better thickness control over a large area. © 2023 American Chemical Society.

关键词： Aluminum oxide

来源：评论

学校读者我要写书评

暂无评论

Assessment of the Morphology and Interaction of PHBV/Clay Bionanocomposites: Uses as Food Packaging

引用

Macromolecular Symposia 2016年第1期367卷 113-118页

作者： da Costa Reis, Dilson Cristino Lemos Morais, Ana Carolina de Carvalho, Laura Hecker Alves, Tatianny Soares Barbosa, Renata Federal University of Piauí Graduate Program in Materials Science Polymers and Conjugated Materials Research Group Av. Ininga S/N Ininga Teresina PiauíCEP 64049-550 Brazil Department of Materials Engineering Federal University of Piauí Technology Center TeresinaPiauí Brazil Federal University of Campina Grande Center Science and Technology Graduate Program in Materials Science and Engineering Campina GrandeParaíba Brazil

The production of plastic waste has caused serious environmental impacts. Since the conventional polymers represent one of the largest percentages of waste, a possible solution for this environmental problem is the use of nanoclay-biopolymers for the preparation of food packaging. The objective of this study was to evaluate the morphological structure of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) bionanocomposites and vermiculite through scanning electronic microscopy (SEM) and to verify their packaging/food interaction through the total migration test. The systems were prepared with natural clay and organophilic clay by melt intercalation technique. The migration test was carried out according to the Resolution 105/99 by ANVISA. The SEM micrographs showed a small number of agglomerates for the natural systems and a more uniform structure for the organophilic systems. The migration results of all systems were within the maximum allowable limit for food packages, indicating a possible use of these materials without causing damage to food security. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Biopolymers

来源：评论

学校读者我要写书评

暂无评论

Biomass-Based Discrete Furan Oligomers as materials for Electrochromic Devices

引用

ACS Sustainable Chemistry and engineering 2024年第1期12卷 459-469页

作者： Atayde, Eduardo C. Fong, Guan-Lun Yeh, Jyun-Yi Matsagar, Babasaheb M. Wang, Yu-Cheng Chen, De-Chian Peng, Chi-How Li, Yi-Pei Yamauchi, Yusuke Ho, Kuo-Chuan Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program (TIGP-MST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan Department of Chemistry National Tsing Hua University No. 101 Sec. 2 Kuang-Fu Road Hsinchu 30013 Taiwan Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Sustainable Chemical Science and Technology Program Taiwan International Graduate Program (TIGP-SCST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN) The University of Queensl Brisbane 4072 QLD Australia Department of Materials Process Engineering Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan Institute of Polymer Science and Engineering National Taiwan University No.1 Sec. 4 Roosevelt Rd. Taipei 10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University No. 135 Yuandong Rd. Taoyuan 320 Taiwan

Electrochromic devices (ECDs) are materials that can undergo reversible changes in transmittance when exposed to different applied potentials. While many conjugated heterocyclic oligomers, such as oligothiophenes, have been developed for this purpose, there is no reported study on the use of discrete oligomeric furans as ECD materials. In this work, we introduce a furan trimer that can be utilized as a discrete electrochromic material, which transitions from light yellow to red and has a very high coloration efficiency of 1940 cm²/C at 507 nm. We propose that the reversible π-stack formation of the oligomer radical cations is behind this phenomenon, as evidenced by both experimental and computational results. The derivability of this oligomer from biomass and its facile synthesis make it an interesting alternative for other existing organic electrochromic materials. © 2023 American Chemical Society

关键词： electrochromism furan oligomer hydroxyalkylation−alkylation reaction solvatochromism π-stacks

来源：评论

学校读者我要写书评

暂无评论

Atmospheric Pressure Plasma Jet Treatment of Human Hair Fibers

引用

Journal of Bio- and Tribo-Corrosion 2015年第1期1卷 1-10页

作者： Öngel, Cansu Keleş, Merve Acar, Erhan Birer, Özgür Department of Chemistry Koç University Rumeli Feneri Yolu Sariyer Istanbul34450 Turkey Department of Molecular Biology and Genetics Koç University Rumeli Feneri Yolu Sariyer Istanbul34450 Turkey Materials Science and Engineering Graduate Program Koç University Rumeli Feneri Yolu Sariyer Istanbul34450 Turkey KUYTAM Surface Science and Technology Center Koç University Rumeli Feneri Yolu Sariyer Istanbul34450 Turkey

Human hair fibers in virgin and dyed forms were treated with atmospheric pressure helium, helium/oxygen, argon, and argon/oxygen plasma jets at 20 W of power. The effects of 10-min plasma treatment on surface morphology and chemistry were studied by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. The plasma treatment was quite effective for removing the organic residues from the surface and creating oxidized functional groups. Helium plasma had a mild cleaning effect on the surfaces while argon/oxygen plasma had the strongest corrosive effect. Mild hydrogen peroxide treatment for the same duration had neither the cleaning nor the oxidizing power of the plasma jets. These types of plasma jets have the potential to replace peroxide treatment. The corrosive jets can be used to restore dyed hair fibers. In addition, the jets can be used to clean the surfaces of hair fibers to prepare samples for analytical investigations where the organic residues may induce problems. © 2015, Springer International Publishing AG.

关键词： Plasma jets

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：