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MRS Advances

作者： Silva, Ricardo M. Noremberg, Bruno S. Marins, Natália H. Alano, Jose H. Santana, Luiza R. Valentini, Antoninho Lukowiec, Dariusz Tański, Tomasz Carreño, Neftalí L.V. Graduate Program in Materials Science and Engineering Technology Development Center Federal University of Pelotas PelotasRS96010-000 Brazil Federal University of Ceará Department of Analytical Chemistry and Chemical Physics FortalezaCE Brazil Institute of Engineering Materials and Biomaterials Silesian University of Technology Gliwice Poland Center for Nanotechnology Silesian University of Technology Gliwice Poland

Composite of PZT (lead zirconate titanate) and PLZT (lead lanthanum zirconate titanate) along an organic, renewable, conductive, and flexible matrix have been developed. The conductive paper was obtained through the reaction between the cellulose extracted from banana stem and functionalized MWCNT. This reaction was made in the presence of hydrogen (from H2SO4), which reduced the size of the cellulose by acid hydrolysis and promotes the interaction between its hydroxyls and the carboxyl groups of nanotubes. Afterward, the PZT particles were synthesized and grown up on the conductive paper by microwaves-assisted hydrothermal synthesis (MHS). The composite material was characterized by structure and morphology. Moreover, gas-sensing in the presence of methanol and electrical resistance as a function of temperature were also investigated. In this way, a simple, low-cost and successful synthesis was reported. Also, a promising flexible was obtained using a chemical transformation process from banana residue as source of cellulose. Copyright © materials Research Society 2018.

关键词： Cellulose

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No external load measurement strategy for micro thermoelectric generator based on high-performance Si_(1-x-y)Ge_(x)Sn_(y) film

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Journal of Materiomics 2021年第4期7卷 665-671页

作者： Ying Peng Sijing Zhu Huajun Lai Jie Gao Masashi Kurosawa Osamu Nakatsuka Sakae Tanemura Biaolin Peng Lei Miao Guangxi Key Laboratory of Information Material School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin541004China Department of Materials Physics Graduate School of EngineeringNagoya UniversityNagoya464-8603Japan PRESTO Japan Science and Technology Agency4-1-8HonchoKawaguchiSaitama332-0012Japan Institute of Materials and Systems for Sustainability Nagoya UniversityNagoya464-8601Japan Japan Fine Ceramics Center 2-4-1 MutsunoAtsuta-kuNagoya456-8587Japan Center on Nanoenergy Research Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured MaterialsGuangxi Key Laboratory for Relativity AstrophysicsNanning530004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo135-8548Japan

In this study,a micro in-plane p-type thermoelectric generator(TEG),which consists of thin-film Si_(1-x-y)Ge_(x)Sn_(y) ternary alloy semiconductor on insulator,is developed to make efficient use of waste heat such as human body.A power factor value as high as 1095 mWm^(-1) K^(-2) had been achieved using Bion implanted and short-term rapid thermal annealing(RTA)*** addition,a measuring scheme for micro TEG without external load resistance was *** one measuring session,multiple parameters can be *** micro single-arm TEG prepared by semiconductor process can output 0.29 nW power at a temperature difference of 15 K,and a cross-sectional power density has reached up to 0.58 mW/cm^(2),which is a superior value for wearable *** findings of this study have important reference value for wearable device performance improvement and output power measuring of micro TEG.

关键词： Si_(1-x-y)Ge_(x)Sn_(y) film P-type TEG No external load measurement Ambient power density

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Mechanistic and theoretical investigation of acetaminophen adsorption on titanium-coated biochar: Statistical physics models and DFT insights

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Surfaces and Interfaces 2025年 69卷

作者： Ronaldo Antunes Funari Junior Ana Carolina Ferreira Piazzi Fuhr Fernando Machado Machado Marcos Leandro Silva Oliveira Luis Felipe Oliveira Silva Salah Knani Besma Graba Guilherme Luiz Dotto Research Group on Adsorptive and Catalytic Process Engineering (ENGEPAC) Federal University of Santa Maria Av. Roraima 1000-7 97105–900 Santa Maria RS Brazil Materials Science and Engineering Graduate Program Federal University of Pelotas (UFPel) 1 Gomes Carneiro St. 96010-610 Pelotas RS Brazil Universidad De La Costa Calle 58 # 55–66 080002 Barranquilla Atlántico Colombia Center for Scientific Research and Entrepreneurship Northern Border University Arar 73213 Saudi Arabia Department of Physics College of Science Northern Border University Arar Saudi Arabia

This study investigated acetaminophen removal using biochar from Pinus elliottii modified by titanium deposition under different conditions. The raw biochar was initially obtained, and then the magnetron sputtering technique was applied to deposit thin films of titanium on the biochar surface under different conditions. The effect of titanium deposition was evaluated by an integrated approach that included physicochemical characterization of the adsorbent materials, statistical physics modeling, and theoretical analysis by Density Functional Theory (DFT), allowing an in-depth understanding of the adsorption mechanism at the macroscopic and molecular levels. Models based on statistical physics indicated that the removal process occurs predominantly by physical adsorption (adsorption energy between 19.71 and 24.75 kJ mol −1 ), with the formation of double layers and variations in the adsorption energy according to the metal deposition conditions. The steric parameters ( n > 0.5) revealed changes in the adsorption geometry, and the number of molecules adsorbed per site correlated with the titanium deposition conditions. DFT analysis showed electronegative regions in the O11 and O16 atoms with Condensed Double Descriptors (CDD = –0.0637 and –0.0511), associated with forming hydrogen bonds with the biochar. The distribution of the frontier orbitals showed a HOMO-LUMO gap of 5.24 eV, indicating the high electronic stability of the molecule. The results demonstrate that titanium deposition selectively modifies the adsorptive properties of biochar, interaction energies, and adsorption geometry.

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Incorporation of lead containing TV tube glass waste in aluminous porcelain

Incorporation of lead containing TV tube glass waste in alum...

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作者： Santos, Talita Faria Paes, Herval Ramos Holanda, José Nilson França Post-Graduate Program in Materials Science and Engineering - PPGECM Universidade Estadual do Norte Fluminense - UENF Campos dos Goytacazes RJ28013-602 Brazil Laboratory of Advanced Materials - LAMAV Universidade Estadual do Norte Fluminense - UENF Campos dos Goytacazes RJ28013-602 Brazil

The aim of this work was to study the incorporation of lead containing TV tube glass waste as a method to provide alternative raw material for aluminous electrical porcelain. For this purpose, aluminous porcelain formulations containing up to 30 wt.% of TV tube glass waste as a replacement for traditional flux material (sodium feldspar) were pressed and fired in air at 1300 ºC using a fast-firing cycle (11 Ω.cm have high potential to work as electrical insulator material. This use of lead containing TV tube glass waste can contribute greatly to reducing the environmental impacts related to it, and also save the sources of non-renewable raw materials used in the electrical porcelain sector. © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Glass

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DEVELOPMENT OF GREENER AND MORE EFFECTIVE HIGH-TEMPERATURE THERMAL INSULATORS 17

DEVELOPMENT OF GREENER AND MORE EFFECTIVE HIGH-TEMPERATURE T...

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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

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Production and characterisation of ceramic foams from industrial solid waste

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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

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MgAl2O4 foams obtained by combustion synthesis

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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

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Production and characterisation of glass foams for thermal insulation

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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

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

A case study on statistical characterization and optimizatio...

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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

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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...

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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

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