检索结果-内蒙古大学图书馆

Morphological Characterization of Brazil Nut Tree (Bertholletia excelsa) Fruit Pericarp

Journal of Renewable materials 2019年第7期7卷 683-692页

作者： Gustavo P.Petrechen Marcos Arduin JoséD.Ambrósio Materials Science and Engineering Postgraduate Program Federal University of São CarlosSão CarlosBrazil Center of Characterization and Materials Development Federal University of São CarlosSão CarlosBrazil Department of Botany Federal University of São CarlosSão CarlosBrazil Citlab-Science Innovation and Technology LaboratorySorocabaBrazil

This article presents the overall morphological structure of the Brazil nut tree(Bertholletia excelsa)fruit pericarp,from macro to nano *** acquired knowledge would be used for the development of new applications,like using the materials as fillers for biocomposites,or as a hierarchical architecture model for *** research was performed using stereo and light microscopy and conventional and force field emission scanning electron *** pericarp presents three layers:the exocarp,a dark gray,brittle and fragile outer layer;the mesocarp,a beige,dry,rigid,impermeable and fibrous intermediate layer;and the endocarp,an inner layer with similar characteristic as the exocarp,but formed next to the ***,the exocarp and the endocarp presented minor regions of sclereids,fibers and vascular cell bundles,inside major regions of parenchyma *** mesocarp presents a structure of fiber cells regions alternating with sclereids and vascular cells regions,arranged in a composite like arrangement,with the fibers cells bundles acting as randomly oriented disperse phases in a sclereid cells *** arrangement was associated with the mesocarp relative superior proprieties,indicating a great material for using as fillers for biocomposites or in biomimetics applications.

关键词： Bertholletia excelsa brazil nut fruit pericarp morphological structure microscopy

来源：评论

学校读者我要写书评

暂无评论

Coupled effects of morphology/length scale of the microstructure and microsegregation on the corrosion behaviour of a single-phase Zn-1wt%Cu alloy

Next Materials

引用

Next materials 2025年 8卷

作者： Miranda, Romulo S. Vida, Talita Ligeiro, Henrique S. Cheung, Noé Simões, Fábio R. Garcia, Amauri Brito, Crystopher Postgraduate Program in Engineering São Paulo State University Guaratinguetá Brazil Department of Aeronautical Engineering School of Engineering/São Paulo State University São João da Boa Vista Brazil Department of Manufacturing and Materials Engineering University of Campinas Campinas Brazil Institute of Marine Science Federal University of São Paulo Santos Brazil

Zn-Cu alloys are promising for biomaterials due to their unique properties. Unlike most metallic alloys, Zn-Cu exhibits a partition coefficient greater than 1, leading to solvent segregation. This study aims to explore how microsegregation and cellular microstructure affect the corrosion behaviour of a Zn-1wt%Cu alloy. Three specimens, with cellular spacings of approximately 8, 16, and 32 µm, were extracted from a directionally solidified casting. Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization techniques were used to assess the corrosion performance in NaCl solutions. The results showed that coarser cellular structures demonstrated higher corrosion resistance, evidenced by greater charge transfer resistances and lower current densities. Corrosion initiated at the Cu-poor cellular boundaries, acting as anodic regions, and became more severe in finer microstructures. In contrast, larger cells with fewer boundaries exhibited less generalised corrosion, confirming that microstructural coarsening improves corrosion resistance. © 2025 The Authors

关键词： Biodegradable Zn-Cu alloys Corrosion behaviour in NaCl Electrochemical performance of biomaterials Galvanic corrosion mechanisms Microstructural refinement

来源：评论

学校读者我要写书评

暂无评论

Microstructural and mechanical characterization of superelastic Ni-Free Ti-Nb-based shape memory alloys

引用

materials Today Communications 2025年 47卷

作者： Vitória Hellem Marques Costa Guedes Suelene Silva Araújo Carlos Costa de Carvalho Paulo César Sales da Silva Carlos José de Araújo Postgraduate Program in Materials Science and Engineering (PPG-CEMat) Universidade Federal de Campina Grande Av. Aprígio Veloso 882 Campina Grande PB CEP 58429-140 Brazil Department of Mechanical Engineering Universidade Federal de Campina Grande Av. Aprígio Veloso 882 Campina Grande PB CEP 58429-140 Brazil

Shape Memory Alloys (SMAs) are smart materials that regain their original shape after significant deformation, typically over 1 % under uniaxial tension. Ni-Ti alloys stand out for their low elastic modulus, high recoverable strain, and excellent corrosion resistance. However, nickel raises biocompatibility concerns due to potential adverse effects. As an alternative, Ni-free Ti-Nb-based SMA, composed entirely of biocompatible elements, have emerged as a promising option for biomedical applications. This study investigated and characterized Ti-xNb-based, alloys with x = 23 %, 25 % and 27 % (at%), manufactured by arc melting, cold rolling, and vacuum annealing followed by quenching. The focus was on their mechanical and microstructural properties, particularly cyclic mechanical loading, thermomechanical behavior, and ultramicroindentation, areas still underexplored in the literature. XRD confirmed the predominance of the β phase and EDS verified good compositional homogeneity. Mechanical testing showed that increasing niobium content reduced the elastic modulus, hardness, and reduction modulus due to β-phase stabilization. Tensile tests indicated changes in shape recovery through superelasticity. Overall, Ti-Nb-based alloys presented excellent mechanical properties with potential for biomedical applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Antimicrobial Potential of Linear Low-Density Polyethylene Food Packages with Ag Nanoparticles in Different Carriers (Sio2 and Hap)

SSRN

引用

SSRN 2023年

作者： da Costa Brito, Sabrina Pereira, Vinicius Alex Cano Prado, Ana Carolina Figueiredo Tobias, Thais Juliana Paris, Elaine Cristina Ferreira, Marcos David São Paulo State University "Julio de Mesquita Filho" Rod. Araraquara Jaú Km 01 SP Araraquara14800-903 Brazil Embrapa Instrumentação Rua XV de Novembro 1452 SP São Carlos13560-970 Brazil Biotechnology Graduate Program Federal University of São Carlos Rod. Washington Luís Km 235 – C. P.676 SP São Carlos13.565-905 Brazil Postgraduate Program in Materials Science and Engineering Federal University of São Carlos Rod. Washington Luís Km 235 – C. P.676 SP São Carlos13.565-905 Brazil Chemistry Graduate Program University of Sao Paulo Av. Trabalhador São-carlense 400 SP São Carlos13.560-970 Brazil Postgraduate Program in Chemistry Federal University of São Carlos Rod. Washington Luís Km 235 – C. P.676 SP São Carlos13.565-905 Brazil

This study intended to verify the antimicrobial efficacy of linear low-density polyethylene films incorporated with silver nanoparticles dispersed in silica and hydroxyapatite carriers at different concentrations. The silver nanoparticles showed a superior inhibitory action on S. aureus and hydroxyapatite was more effective, being this a potential for use in food packaging. © 2023, The Authors. All rights reserved.

关键词： Polymer films

来源：评论

学校读者我要写书评

暂无评论

Synthesis, Characterization, and performance test of modified Zeolite-Si/Al nanocomposite from pumice and waste cans using slow pyrolysis process for removal pollutant parameters from hard water

引用

Environmental Nanotechnology, Monitoring and Management 2023年 20卷

作者： Gusti Wibowo, Yudha Sudibyo Rianjanu, Aditya Taher, Tarmizi Susanti, Noni Karo Karo, Pulung Suprihatin Iman Supriyatna, Yayat Prasetyo, Erik Bahfie, Fathan Amin, Muhammad Syarifuddin, Hutwan Safitri, Hana Khairurrijal, Khairurrijal Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Research Center for Mining Technology National Research and Innovation Agency Lampung Indonesia Department of Material Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Environmental Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Physics Department Universitas Lampung Lampung Indonesia Department of Environmental Science Postgraduate Program Universitas Jambi Jambi 36122 Indonesia Laboratory of Mine Environmental Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Physics Institut Teknologi Sumatera Lampung-36365 Indonesia Department of Physics Institut Teknologi Bandung Bandung 40132 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Indonesia

Hard water is one of crucial problems in the world due to its pollutant parameters. Adsorption is a promising method for treating hard water because of its benefits such as low-cost, easy to use, acceptable, and easy to maintenance. In this study, we utilized zeolite functionalized with silicon/aluminum (Ze-Si/Al) as adsorbent materials for hard water treatment. Ten different ratios of Si/Al were added into zeolite by modifying the solid waste source concentration (pumice and cans). The optimum sample was then further tested with different parameters including contact time, dye concentration, and isotherm models. The zeolite-Si/Al adsorbent was characterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). Results of this study have showed that the best functionalized zeolite was that with Si/Al ratio 0.67, which has higher sorption ability. In contact time test, the equilibrium was reached after 300 min. This study also informed that the concentration of dyes will give impact on removal of pollutant parameters. Isotherm model of Ze-Si/Al fitted with Langmuir method. This study also discussed the potential development and future research direction. Thus, this study is a crucial report to develop the information about waste utilization as source of Si/Al to increasing quality of zeolite. © 2023 Elsevier B.V.

关键词： Adsorption Hard water Wastewater Wastewater treatment zeolite-Si/Al

来源：评论

学校读者我要写书评

暂无评论

Spin pumping mechanism in Py/SnTe bilayers: An approach through the magnetoimpedance effect

引用

Journal of Alloys and Compounds 2025年 1031卷

作者： de Morais, A. Souza, E.C. de Silva, A.L. Gamino, M. da Silva, E.F. Ferreira, A. Vaz, F. Lopes, C. Bohn, F. Correa, M.A. Postgraduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte RN Natal59078-970 Brazil Physics Department Federal University of Rio Grande do Norte RN Natal59075-000 Brazil Physics Department Federal University of Pernambuco PE Recife50670-901 Brazil University of Minho 4710-057 Portugal LaPMET - Laboratory of Physics for Materials and Emergent Technologies University of Minho 4710-057 Portugal

Different techniques addressing magnetization dynamics are helpful to estimate parameters of a ferromagnetic thin film nanostructure in the field of spintronics, including Gilbert damping parameter (αG), spin pumping contributions (αSP), two magnons scattering (αTMS), spin mixing conductance (Geff) and others. When considering a bilayer structure, the non-ferromagnetic layer effects need to be carefully selected to tailor an effective spintronic response. Here, the magnetization dynamics are explored in Ni81Fe19(Py)/Ag and Ni81Fe19(Py)/SnTe nanostructures and report the spin mixing conductance from magnetoimpedance experiments. The results are interpreted by considering structural and magnetic characterizations. The spin mixing conductance is estimated as Geff (Py/Ag) = 1.13×1014 cm−2 and Geff (Py/SnTe) = 18.05 ×1014 cm−2, revealing the significant enhancement of Geff when the SnTe acts as a cap layer, indicating that SnTe is a good spin sink. © 2025 Elsevier B.V.

关键词： Ferromagnetism

来源：评论

学校读者我要写书评

暂无评论

Fabrication of silica-nypa membrane applied for water desalination

引用

AIP Conference Proceedings 2024年第1期2710卷

作者： Muthia Elma Isna Syauqiah Era N. R. Oktaviana Siti Fatimah Aulia Rahma Awali Sir Kautsar Harivram Erdina L. A Rampun Chemical Engineering Department Engineering Faculty Lambung Mangkurat University JL. A. Yani KM 36 Banjarbaru South Kalimantan 70714 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University JL. A.Yani KM 36 Banjarbaru South Kalimantan 70714 Indonesia Doctoral Program of Environmental Science postgraduate Program Lambung Mangkurat University Jl. Brigjen H Hasan Basri Kayutangi Banjarmasin South Kalimantan 70123 Indonesia

Carbon source as a template derived from nypa leaf powder enable to strengthen the silica matrix applied for water desalination. This research aims to synthesize silica-nypa membrane, characterize xerogel silica-nypa leaf and investigate the performance of silica-nypa membrane with various concentration of nypa as a carbon template to treat artificial sea water. The concentrations of nypa leaf as a carbon template are 0.1; 0.5 and 2.5 %wt with a calcination temperature of 350 °C through a rapid thermal processing (RTP) technique. Xerogel characterization using FTIR was employed to analyze a spectrum and Scanning Electron Microscopy (SEM) to investigate the membrane morphology. The result shows that the performance of silica-nypa membrane with water fluxes of 2.1915; 2.0163 and 1.1067 kg.m−2. h−1 (for 0.1; 0.5 and 2.5 %wt. carbon template derived from nypa leaf), and the salt rejection value for all concentrations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Date fruit melanin is primarily based on (-)-epicatechin proanthocyanidin oligomers( vol 14 , 4863 , 2024)

引用

SCIENTIFIC REPORTS 2024年第1期14卷 1-12页

作者： Alam, Muneeba Zubair Okonkwo, Clinton Emeka Cachaneski-Lopes, Joao P. Graeff, Carlos F. O. Batagin-Neto, Augusto Tariq, Saeed Varghese, Sabu O'Connor, Matthew J. Albadri, Abuzar E. Webber, J. Beau W. Tarique, Mohammed Ayyash, Mutamed Kamal-Eldin, Afaf Department of Food Science College of Agriculture and Veterinary Medicine United Arab Emirates University P.O. Box: 15551 Al-Ain United Arab Emirates National Water and Energy Center (NWEC) United Arab Emirates University P.O. Box: 15551 Al-Ain United Arab Emirates Postgraduate Program in Materials Science and Technology (POSMAT) São Paulo State University (UNESP) Bauru SP Brazil Department of Physics School of Sciences São Paulo State University (UNESP) Bauru SP Brazil Institute of Sciences and Engineering São Paulo State University (UNESP) Itapeva SP Brazil Department of Anatomy College of Medicine and Health Sciences United Arab Emirates University Al Ain United Arab Emirates Core Technology Platforms New York University Abu Dhabi 129188 Abu Dhabi United Arab Emirates Department of Chemistry College of Science Qassim University 51452 Buraidah Saudi Arabia Lab-Tools Ltd. Marlowe Innovation Centre Marlowe Way Ramsgate CT12 6FA UK

Plant-based melanin seems to be abundant, but it did not receive scientific attention despite its importance in plant biology and medicinal applications, e.g. photoprotection, radical scavenging, antimicrobial properties, etc. Date fruit melanin (DM) has complex, graphene-like, polymeric structure that needs characterization to understand its molecular properties and potential applications. This study provides the first investigation of the possible molecular composition of DM. High performance size-exclusion chromatography (HPSEC) suggested that DM contains oligomeric structures (569–3236 Da) and transmission electron microscopy (TEM) showed agglomeration of these structures in granules of low total porosity (10–1000 Å). Nuclear magnetic resonance (NMR) spectroscopy provided evidence for the presence of oligomeric proanthocyanidins and electron paramagnetic resonance (EPR) spectroscopy revealed a g-factor in the range 2.0034–2.005. Density functional theory (DFT) calculations suggested that the EPR signals can be associated with oligomeric proanthocyanidin structures having 4 and above molecular units of (−)-epicatechin. The discovery of edible melanin in date fruits and its characterization are expected to open a new area of research on its significance to nutritional and sensory characteristics of plant-based foods.

关键词： Phoenix dactylifera L. (−)-Epicatechin Date fruit Melanin Proanthocyanidins

来源：评论

学校读者我要写书评

暂无评论

Alkali-Activated Eco-Friendly Mixtures with Low-Processed Sugarcane Bagasse Ash—Physical, Mechanical, and Microstructural Properties

SSRN

引用

SSRN 2022年

作者： Lima, Victor Estolano de Estolano, Amanda Marques Lopes Almeida, Yeda Medeiros Bastos de Henrique, Mariana Alves Araújo, Fernanda Wanderley Corrêa de Melo Neto, Antonio Acacio de Federal University of Pernambuco Department of Civil and Environmental Engineering LabTag Av. da Arquitetura Recife Brazil Federal University of Pernambuco National Institute of Welding Technology and Coating of Materials INTM Rua da Inovação Recife Brazil Federal University of Pernambuco Institute for Petroleum and Energy Research LITPEG Petrochemical Laboratory Av. da Arquitetura Recife Brazil Federal University of Pernambuco Postgraduate Program in Materials Science Av. Jorn. Aníbal Fernandes Recife Brazil Federal Rural University of Pernambuco Department of Rural Technology Rua Cento e Sessenta e Três Cabo de Santo Agostinho Brazil

In this study, sugarcane bagasse ash was used to evaluate the physical, mechanical, and microstructural properties of eco-friendly alkali-activated mixtures with blast furnace slag. Net sodium silicate and solid metasilicate were used as activators to produce conventional and one-part alkali-activated mixtures, respectively. Two types of sugarcane bagasse ash were analyzed: raw (as-received) and calcined. The low number of proposed processes reduces the economic aggregate cost of recycled ash. Further, the blast furnace slag replacement ratios of raw and calcined sugarcane bagasse ash were 10%, 30%, 50%, and 70%. Mortars were prepared for the compressive and flexural strength tests, water absorption, and dry density. Alternatively, X-ray diffraction, thermogravimetry, infrared spectroscopy, and scanning electron microscopy were used to assess the chemical, mineralogical, and microstructural properties of the prepared pastes. In addition, the fresh test was performed using the flow table test, wherein the spread diameter decreased as the SBA content increased, primarily on the raw ash owing to its high organic material content. Moreover, compressive strength results showed that the compressive strength increased after 3 days for mixtures with 10% and 30% SBA. However, at 28 days, there was a decrease with an increase in the SBA content. Similar behavior was observed in the flexural strength and water absorption tests. Tests on pastes verified the probable presence of alternative phases besides C-(A)-S-H, such as pectolite, brucite, hydrotalcite, and zeolites. In addition, through the combination of scanning electron microscopy and energy dispersive spectroscopy techniques, the presence of preserved cellular structure was observed in the alkali-activated matrix, and Ca/Si and Si/Al ratios were calculated. It was concluded that the low reactivity of raw sugarcane bagasse ash and the low reactivity of both ashes significantly decreased mechanical performance. Furthermor

关键词： Slags

来源：评论

学校读者我要写书评

暂无评论

Correction to: SARS-CoV-2 removal with a polyurethane foam composite

引用

Environmental science and pollution research international 2023年第8期30卷 22033页

作者： Guilherme Pereira Schoeler Thays França Afonso Carolina Faccio Demarco Victor Dos Santos Barboza Tito Roberto Sant'anna Cadaval Andrei Valerão Igansi Marcos Alexandre Gelesky Janice Luehring Giongo Rodrigo de Almeida Vaucher Rafael de Avila Delucis Robson Andreazza Postgraduate Program in Environmental Sciences Center for Engineering Federal University of Pelotas R. Benjamin Constant 989 Pelotas RS CEP 96010-020 Brazil. Postgraduate Program in Materials Science and Engineering Federal University of Pelotas R. Gomes Carneiro 01 Pelotas RS CEP 96010-610 Brazil. Graduate Program in Biochemistry and Bioprospecting Research Laboratory in Biochemical and Molecular Biology of Microorganisms (LaPeBBiOM) Federal University of Pelotas RS Av. Eliseu Maciel Campus Universitário s/n Capão Do Leão CEP 96160-000 Brazil. School of Chemistry and Food Federal University of Rio Grande Av. Itália Km 8 s/n Rio Grande RS CEP 96203-000 Brazil. Postgraduate Program in Environmental Sciences Center for Engineering Federal University of Pelotas R. Benjamin Constant 989 Pelotas RS CEP 96010-020 Brazil. robsonandreazza@yahoo.com.br. Postgraduate Program in Materials Science and Engineering Federal University of Pelotas R. Gomes Carneiro 01 Pelotas RS CEP 96010-610 Brazil. robsonandreazza@yahoo.com.br.

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：