Pub Date : 2024-09-01DOI: 10.1016/j.bsecv.2024.05.001
Jon García-Barruetabeña, David Miñón, Beatriz Achiaga, Fernando Cortés
This article presents a methodology for the characterization of the dynamic properties of a laminated glass automotive ceiling, motivated by the inherent difficulty in obtaining laboratory samples from this kind of components. This methodology is based on the identification of the effective complex modulus of the laminated glass ceiling through Experimental Modal Analysis in conjunction with a finite element model. Besides, a material behaviour model is proposed for the effective complex module. Then, the dynamic properties of the laminated glass core are extracted from the latter using a reverse homogenized formulation of sandwich plates specifically developed in this work. As a result, a methodology to accurately predict the dynamic behaviour of these key automotive components has been achieved. An additional advantage of this methodology is that the identification of properties is carried out from a manufactured component and not from samples of reduced geometries, considering the impact of the manufacturing process.
{"title":"Characterization of the dynamic properties of an automotive laminated glass ceiling","authors":"Jon García-Barruetabeña, David Miñón, Beatriz Achiaga, Fernando Cortés","doi":"10.1016/j.bsecv.2024.05.001","DOIUrl":"10.1016/j.bsecv.2024.05.001","url":null,"abstract":"<div><div>This article presents a methodology for the characterization of the dynamic properties of a laminated glass automotive ceiling, motivated by the inherent difficulty in obtaining laboratory samples from this kind of components. This methodology is based on the identification of the effective complex modulus of the laminated glass ceiling through Experimental Modal Analysis in conjunction with a finite element model. Besides, a material behaviour model is proposed for the effective complex module. Then, the dynamic properties of the laminated glass core are extracted from the latter using a reverse homogenized formulation of sandwich plates specifically developed in this work. As a result, a methodology to accurately predict the dynamic behaviour of these key automotive components has been achieved. An additional advantage of this methodology is that the identification of properties is carried out from a manufactured component and not from samples of reduced geometries, considering the impact of the manufacturing process.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 5","pages":"Pages 346-355"},"PeriodicalIF":2.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/j.bsecv.2024.06.002
Daniel Drdlik , Vojtech Marak , Robert Klement , Pavel Tofel , Katarina Drdlikova , Hynek Hadraba , Zdenek Chlup
In progressive particle or layered composites based on a combination of BaTiO3 and Al2O3, serving as e.g. ceramic harvesters, new phases are formed during heat treatment. The dominant one is BaTiAl6O12. This study provides information about the microstructural, mechanical and optical properties of the BaTiAl6O12 ceramics. The evolution of the phases during the solid-state reaction synthesis of the BaTiAl6O12 was monitored. The fully dense samples prepared by spark plasma sintering had indentation Vickers hardness and indentation elastic modulus within ranges of 10.1–13.7 GPa and 132.0–187.0 GPa, depending on loading force. The three-point bending tests of the BaTiAl6O12 samples resulted in flexural strength of 129.9 MPa and fracture toughness of 1.8 MPa m1/2. The sample showed blue broad-band emission under UV excitation due to the charge-transfer transition of the Ti4+ and defect sites. The BaTiAl6O12 evinced low permittivity (ɛ′) = 16 and dielectric loss (tanδ) <0.0003 at a frequency 1 kHz.
{"title":"Basic microstructural, mechanical, electrical and optical characterisation of BaTiAl6O12 ceramics","authors":"Daniel Drdlik , Vojtech Marak , Robert Klement , Pavel Tofel , Katarina Drdlikova , Hynek Hadraba , Zdenek Chlup","doi":"10.1016/j.bsecv.2024.06.002","DOIUrl":"10.1016/j.bsecv.2024.06.002","url":null,"abstract":"<div><div>In progressive particle or layered composites based on a combination of BaTiO<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>, serving as e.g. ceramic harvesters, new phases are formed during heat treatment. The dominant one is BaTiAl<sub>6</sub>O<sub>12</sub>. This study provides information about the microstructural, mechanical and optical properties of the BaTiAl<sub>6</sub>O<sub>12</sub> ceramics. The evolution of the phases during the solid-state reaction synthesis of the BaTiAl<sub>6</sub>O<sub>12</sub> was monitored. The fully dense samples prepared by spark plasma sintering had indentation Vickers hardness and indentation elastic modulus within ranges of 10.1–13.7<!--> <!-->GPa and 132.0–187.0<!--> <!-->GPa, depending on loading force. The three-point bending tests of the BaTiAl<sub>6</sub>O<sub>12</sub> samples resulted in flexural strength of 129.9<!--> <!-->MPa and fracture toughness of 1.8<!--> <!-->MPa<!--> <!-->m<sup>1/2</sup>. The sample showed blue broad-band emission under UV excitation due to the charge-transfer transition of the Ti<sup>4+</sup> and defect sites. The BaTiAl<sub>6</sub>O<sub>12</sub> evinced low permittivity (<em>ɛ</em>′)<!--> <!-->=<!--> <!-->16 and dielectric loss (<em>tan</em> <em>δ</em>) <0.0003 at a frequency 1<!--> <!-->kHz.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 5","pages":"Pages 368-376"},"PeriodicalIF":2.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/j.bsecv.2024.07.002
María Luisa Sanjuán , Rosa Isabel Merino , Annu Kumar Lakshya , Anirban Chowdhury
Ceria-based compounds with trivalent dopant ions are currently being investigated as electrolytes for solid oxide fuel cells operating at low to intermediate temperatures. In these materials, the dependence of the ionic conductivity on the dopant content, the relative cation size and the dopant/vacancy or vacancy/vacancy interactions are the subject of intense research, but there is scarce information about a possible correlation between these properties and microstructural ones, such as texture. Here, we address this question in the heavily doped fluorite-like La2Ce2O7 oxide, using a combination of X-ray diffraction, electron microscopy, optical absorption, Raman scattering and impedance spectroscopy. In all cases, materials with varying degree of 〈1 1 1〉 texture are compared with untextured samples. In this context, the most relevant Raman signatures are the fluorite-like mode at ∼448 cm−1 and a vacancy-related band at ∼578 cm−1. Although remarkable changes were observed upon varying the sintering temperature or the excitation wavelength, both textured and untextured materials displayed similar evolution. A selective enhancement of the vacancy-related band was observed upon decreasing the excitation wavelength from 647 to 488 nm, which is attributed to a resonance phenomenon involving vacancy-related electronic transitions. An indication of incipient vacancy ordering was given by the observation of an intense band at ∼346 cm−1, denoting C-R2O3-like short-range order; its enhancement with the annealing temperature is attributed to the growth of the C-like regions. Conductivity was measured in textured and untextured, fully dense pellets, in the former along and across the texture direction. Impedance plots suggest that the conductivity is dominated by oxide ions and do not allow to separate a grain boundary contribution in these materials with grain size around 1–2 μm. The conductivity amounts to around 10−5 S/cm at 650 K, with activation energy of 1.08–1.16 eV in the temperature range from around 470 to 870 K. Results were similar in textured and untextured materials. We conclude that there is no significant correlation between texture and vacancy concentration or vacancy ordering. A similar conclusion – no influence of texture – is reached concerning the electrical properties.
目前正在研究将含有三价掺杂离子的铈基化合物作为在中低温下工作的固体氧化物燃料电池的电解质。在这些材料中，离子电导率与掺杂剂含量、相对阳离子尺寸和掺杂剂/空位或空位/空位相互作用的关系是研究的热点，但有关这些特性与微观结构特性（如质地）之间可能存在的相关性的信息却很少。在此，我们结合使用 X 射线衍射、电子显微镜、光学吸收、拉曼散射和阻抗光谱，在重掺杂萤石类 La2Ce2O7 氧化物中解决了这一问题。在所有情况下，具有不同程度〈1 1 1〉纹理的材料都与无纹理样品进行了比较。在这种情况下，最相关的拉曼特征是 ∼448 cm-1 处的萤石样模式和 ∼578 cm-1 处的空位相关带。尽管在改变烧结温度或激发波长时观察到了明显的变化，但有纹理和无纹理材料都显示出类似的演变。当激发波长从 647 纳米降低到 488 纳米时，观察到空位相关带有选择性地增强，这归因于涉及空位相关电子跃迁的共振现象。在 ∼346 cm-1 处观察到一个强烈的条带，表示类似 C-R2O3 的短程有序，这表明了空位有序化的萌芽；它随退火温度的升高而增强，这归因于类似 C 区域的增长。在有纹理和无纹理、完全致密的颗粒中测量了前者沿纹理方向和跨纹理方向的电导率。阻抗图显示，导电性主要由氧化物离子主导，无法从这些晶粒尺寸约为 1-2 μm 的材料中分离出晶界的贡献。在 650 K 时，电导率约为 10-5 S/cm，在约 470 至 870 K 的温度范围内，活化能为 1.08-1.16 eV。我们得出结论：质地与空位浓度或空位排序之间没有明显的相关性。在电学特性方面，我们也得出了类似的结论--质地没有影响。
{"title":"Spectroscopic insight into the structural and microstructural properties of La2Ce2O7 ceramics","authors":"María Luisa Sanjuán , Rosa Isabel Merino , Annu Kumar Lakshya , Anirban Chowdhury","doi":"10.1016/j.bsecv.2024.07.002","DOIUrl":"10.1016/j.bsecv.2024.07.002","url":null,"abstract":"<div><div>Ceria-based compounds with trivalent dopant ions are currently being investigated as electrolytes for solid oxide fuel cells operating at low to intermediate temperatures. In these materials, the dependence of the ionic conductivity on the dopant content, the relative cation size and the dopant/vacancy or vacancy/vacancy interactions are the subject of intense research, but there is scarce information about a possible correlation between these properties and microstructural ones, such as texture. Here, we address this question in the heavily doped fluorite-like La<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> oxide, using a combination of X-ray diffraction, electron microscopy, optical absorption, Raman scattering and impedance spectroscopy. In all cases, materials with varying degree of 〈1<!--> <!-->1<!--> <!-->1〉 texture are compared with untextured samples. In this context, the most relevant Raman signatures are the fluorite-like mode at ∼448<!--> <!-->cm<sup>−1</sup> and a vacancy-related band at ∼578<!--> <!-->cm<sup>−1</sup>. Although remarkable changes were observed upon varying the sintering temperature or the excitation wavelength, both textured and untextured materials displayed similar evolution. A selective enhancement of the vacancy-related band was observed upon decreasing the excitation wavelength from 647 to 488<!--> <!-->nm, which is attributed to a resonance phenomenon involving vacancy-related electronic transitions. An indication of incipient vacancy ordering was given by the observation of an intense band at ∼346<!--> <!-->cm<sup>−1</sup>, denoting C-R<sub>2</sub>O<sub>3</sub>-like short-range order; its enhancement with the annealing temperature is attributed to the growth of the C-like regions. Conductivity was measured in textured and untextured, fully dense pellets, in the former along and across the texture direction. Impedance plots suggest that the conductivity is dominated by oxide ions and do not allow to separate a grain boundary contribution in these materials with grain size around 1–2<!--> <!-->μm. The conductivity amounts to around 10<sup>−5</sup> <!-->S/cm at 650<!--> <!-->K, with activation energy of 1.08–1.16<!--> <!-->eV in the temperature range from around 470 to 870<!--> <!-->K. Results were similar in textured and untextured materials. We conclude that there is no significant correlation between texture and vacancy concentration or vacancy ordering. A similar conclusion – no influence of texture – is reached concerning the electrical properties.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 5","pages":"Pages 318-329"},"PeriodicalIF":2.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/j.bsecv.2024.10.003
Amador C. Caballero
{"title":"Inteligencia artificial y materiales","authors":"Amador C. Caballero","doi":"10.1016/j.bsecv.2024.10.003","DOIUrl":"10.1016/j.bsecv.2024.10.003","url":null,"abstract":"","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 5","pages":"Page 317"},"PeriodicalIF":2.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/j.bsecv.2024.04.002
A glass-ceramic in the CaO–P2O5–SiO2 system, which contains two polymorphic modifications of tricalcium phosphate – whitlockite, β-Ca3(PO4)2 and α-Ca3(PO4)2, has been synthesized by the sol–gel method and thermal treatment up to 1200 °C. The phase composition and microstructure of the glass-ceramic were investigated with X-ray diffraction analysis (XRD), Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS). An in vitro bioactivity test of the glass-ceramic in a simulated body fluid (SBF) was conducted for up to 21 days. α-Ca3(PO4) dissolved almost completely in SBF after 7 days. The experimental results of XRD, FTIR, SEM and EDS clearly validated the ability of the glass-ceramic samples to form a layer of hydroxyapatite on their surface in an SBF environment. We also studied the cytotoxic effect of the glass-ceramic on murine bone marrow (BM) cells and pre-osteoclasts in vitro. The glass-ceramic reduced the viability of BM cells in a dose-dependent manner being less toxic at concentrations below 0.1 mg/ml. It modestly affected the viability of pre-osteoclasts cultured in osteoclast differentiation media. The obtained sample increased the percentage of pre-osteoclasts expressing the receptors involved in osteoclastogenesis (RANK) and apoptosis (TRAIL). In conclusion, the glass-ceramic showed the potential to affect the survival/differentiation of pre-osteoclasts at early stage of osteoclastogenesis. It might be suitable for tissue engineering including implants coating or scaffold as it can interfere with early stage of osteoclastogenesis which is required for proper bone remodelling and repair upon a long-term application of biomaterials.
{"title":"α/β-TCP silicate glass-ceramic obtained by sol–gel: Structure and in vitro bioactivity","authors":"","doi":"10.1016/j.bsecv.2024.04.002","DOIUrl":"10.1016/j.bsecv.2024.04.002","url":null,"abstract":"<div><div>A glass-ceramic in the CaO–P<sub>2</sub>O<sub>5</sub>–SiO<sub>2</sub> system, which contains two polymorphic modifications of tricalcium phosphate – whitlockite, β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> and α-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, has been synthesized by the sol–gel method and thermal treatment up to 1200<!--> <!-->°C. The phase composition and microstructure of the glass-ceramic were investigated with X-ray diffraction analysis (XRD), Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS). An <em>in vitro</em> bioactivity test of the glass-ceramic in a simulated body fluid (SBF) was conducted for up to 21 days. α-Ca<sub>3</sub>(PO<sub>4</sub>) dissolved almost completely in SBF after 7 days. The experimental results of XRD, FTIR, SEM and EDS clearly validated the ability of the glass-ceramic samples to form a layer of hydroxyapatite on their surface in an SBF environment. We also studied the cytotoxic effect of the glass-ceramic on murine bone marrow (BM) cells and pre-osteoclasts <em>in vitro</em>. The glass-ceramic reduced the viability of BM cells in a dose-dependent manner being less toxic at concentrations below 0.1<!--> <!-->mg/ml. It modestly affected the viability of pre-osteoclasts cultured in osteoclast differentiation media. The obtained sample increased the percentage of pre-osteoclasts expressing the receptors involved in osteoclastogenesis (RANK) and apoptosis (TRAIL). In conclusion, the glass-ceramic showed the potential to affect the survival/differentiation of pre-osteoclasts at early stage of osteoclastogenesis. It might be suitable for tissue engineering including implants coating or scaffold as it can interfere with early stage of osteoclastogenesis which is required for proper bone remodelling and repair upon a long-term application of biomaterials.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 5","pages":"Pages 330-345"},"PeriodicalIF":2.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140781030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-01DOI: 10.1016/j.bsecv.2023.12.001
Hamilton Copete , Esperanza López , Carmen Baudin
The current approach in bone tissue engineering requires resorbable biomaterials that enhance bone formation while maintaining sufficient mechanical stability. In this work, the influence of three levels of B-type carbonate substitution in hydroxyapatite lattice on mechanical strength and degradation rate is analyzed. The inverse aqueous route has been selected as a synthesis method of four powders with carbonate substitution between 4 and 6 wt.%. X-ray fluorescence (XRF), (C-S)-Analysis, FT-Infrared, X-ray diffraction, DTA-TG and TEM were used to investigate chemical composition, type of substitution, thermal behaviour, and morphology of the powders. Disc shaped specimens were processed by uniaxial pressing and sintering in argon/CO2 flow. Maximum temperatures of thermal treatment between 750 and 850 °C were selected to obtain similar porosity levels for the different compositions. The highest carbonate substituted material (5.3 wt.%) presented higher compressive strength and dissolution rate than the other materials showing the beneficial effect of B-type substitution in hydroxyapatite materials for bone repair.
目前的骨组织工程方法要求可吸收生物材料既能促进骨形成，又能保持足够的机械稳定性。本研究分析了羟基磷灰石晶格中三种程度的 B 型碳酸盐取代对机械强度和降解率的影响。四种碳酸盐取代度介于 4 至 6 wt.% 之间的粉末的合成方法均选择了反向水溶液路线。利用 X 射线荧光 (XRF)、(C-S)分析、傅立叶变换红外光谱、X 射线衍射、DTA-TG 和 TEM 来研究粉末的化学成分、替代类型、热性能和形态。圆盘状试样在氩气/二氧化碳气流中进行单轴压制和烧结处理。热处理的最高温度选择在 750 至 850 ℃ 之间，以获得不同成分的相似孔隙率水平。碳酸盐取代度最高的材料（5.3 wt.%）比其他材料具有更高的抗压强度和溶解率，这表明羟基磷灰石材料中的 B 型取代对骨修复具有有利影响。
{"title":"Synthesis and characterization of B-type carbonated hydroxyapatite materials: Effect of carbonate content on mechanical strength and in vitro degradation","authors":"Hamilton Copete , Esperanza López , Carmen Baudin","doi":"10.1016/j.bsecv.2023.12.001","DOIUrl":"10.1016/j.bsecv.2023.12.001","url":null,"abstract":"<div><p>The current approach in bone tissue engineering requires resorbable biomaterials that enhance bone formation while maintaining sufficient mechanical stability. In this work, the influence of three levels of B-type carbonate substitution in hydroxyapatite lattice on mechanical strength and degradation rate is analyzed. The inverse aqueous route has been selected as a synthesis method of four powders with carbonate substitution between 4 and 6<!--> <!-->wt.%. X-ray fluorescence (XRF), (C-S)-Analysis, FT-Infrared, X-ray diffraction, DTA-TG and TEM were used to investigate chemical composition, type of substitution, thermal behaviour, and morphology of the powders. Disc shaped specimens were processed by uniaxial pressing and sintering in argon/CO<sub>2</sub> flow. Maximum temperatures of thermal treatment between 750 and 850<!--> <!-->°C were selected to obtain similar porosity levels for the different compositions. The highest carbonate substituted material (5.3<!--> <!-->wt.%) presented higher compressive strength and dissolution rate than the other materials showing the beneficial effect of B-type substitution in hydroxyapatite materials for bone repair.</p></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Pages 255-267"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317523000560/pdfft?md5=a9f8a671c105796ecca07a32cd06a780&pid=1-s2.0-S0366317523000560-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-01DOI: 10.1016/j.bsecv.2024.07.005
Amador C. Caballero
{"title":"Actualización de los datos bibliométricos de la revista","authors":"Amador C. Caballero","doi":"10.1016/j.bsecv.2024.07.005","DOIUrl":"10.1016/j.bsecv.2024.07.005","url":null,"abstract":"","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Page 237"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317524000256/pdfft?md5=7db143c80c92aa185d2e2af12057d090&pid=1-s2.0-S0366317524000256-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-01DOI: 10.1016/j.bsecv.2024.02.002
This study investigated the transformation of cancrinite-type zeolite, together with secondary phases, in a hydrothermal system. The mineral kaolin and NaOH were used as precursors under self-generated pressure at 140 °C, varying the reaction time at intervals of 0 to 10 hours. The kaolin, the main precursor, was subjected to X-ray diffraction (XRD), elemental chemical composition (XRF) and Fourier Transform IR Spectroscopy (FT-IR) analyses. The resulting solids were characterized by XRD. Initially, crystalline phases such as Na-P2 zeolites, gismondine, analcime, natrolite and sodalite were formed, but with time they became unstable and dissolved to form new phases. At 8 hours of reaction, the cancrinite zeolite predominated, fulfilling the main objective of the study. The solid material was analyzed by scanning electron microscopy (SEM) and FT-IR. The behavior of Na, Si and Al in the solutions was evaluated over time by inductre coupled plasma (ICP). It was conclusively demonstrated that kaolin from Hidalgo is a feasible precursor to synthesize zeolites, cancrinite type as predominant phase in 8 hours at 140 °C, using moderate concentrations of NaOH.
{"title":"Análisis de la transformación del caolín de Hidalgo en zeolita cancrinita y fases secundarias por el método hidrotermal","authors":"","doi":"10.1016/j.bsecv.2024.02.002","DOIUrl":"10.1016/j.bsecv.2024.02.002","url":null,"abstract":"<div><p>This study investigated the transformation of cancrinite-type zeolite, together with secondary phases, in a hydrothermal system. The mineral kaolin and NaOH were used as precursors under self-generated pressure at 140<!--> <!-->°C, varying the reaction time at intervals of 0 to 10<!--> <!-->hours. The kaolin, the main precursor, was subjected to X-ray diffraction (XRD), elemental chemical composition (XRF) and Fourier Transform IR Spectroscopy (FT-IR) analyses. The resulting solids were characterized by XRD. Initially, crystalline phases such as Na-P2 zeolites, gismondine, analcime, natrolite and sodalite were formed, but with time they became unstable and dissolved to form new phases. At 8<!--> <!-->hours of reaction, the cancrinite zeolite predominated, fulfilling the main objective of the study. The solid material was analyzed by scanning electron microscopy (SEM) and FT-IR. The behavior of Na, Si and Al in the solutions was evaluated over time by inductre coupled plasma (ICP). It was conclusively demonstrated that kaolin from Hidalgo is a feasible precursor to synthesize zeolites, cancrinite type as predominant phase in 8<!--> <!-->hours at 140<!--> <!-->°C, using moderate concentrations of NaOH.</p></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Pages 268-278"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317524000049/pdfft?md5=433751747e2a43d656da2581dbfa7a9a&pid=1-s2.0-S0366317524000049-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140270527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-01DOI: 10.1016/j.bsecv.2024.03.001
The impact of graphene oxide (GO) on the hydration process, calcium silicate hydrate (CSH) gels structure, and macro-mechanical properties were systematically researched by combinatorial techniques. Findings from 29Si MAS-NMR and nitrogen adsorption (BET) revealed that the effect of GO on the hydration degree of the cement paste, and the main chain length (MCL) is more pronounced at advanced ages (from 28 days), due to its act as a nucleation site. Moreover, the results of Raman spectroscopy tests showed that GO has a strong interaction with the cement matrix. Due to the increase in the degree of hydration, the lengthening of the chain length (MCL), and the formation of strong bonds, both compressive and flexural strength tests also improved. Therefore, the effect of GO as a nucleation site has a positive effect on the cement paste nano-properties at advanced ages.
{"title":"Effect of graphene oxide on the hydration process and macro-mechanical properties of cement","authors":"","doi":"10.1016/j.bsecv.2024.03.001","DOIUrl":"10.1016/j.bsecv.2024.03.001","url":null,"abstract":"<div><p>The impact of graphene oxide (GO) on the hydration process, calcium silicate hydrate (C<img>S<img>H) gels structure, and macro-mechanical properties were systematically researched by combinatorial techniques. Findings from <sup>29</sup>Si MAS-NMR and nitrogen adsorption (BET) revealed that the effect of GO on the hydration degree of the cement paste, and the main chain length (MCL) is more pronounced at advanced ages (from 28 days), due to its act as a nucleation site. Moreover, the results of Raman spectroscopy tests showed that GO has a strong interaction with the cement matrix. Due to the increase in the degree of hydration, the lengthening of the chain length (MCL), and the formation of strong bonds, both compressive and flexural strength tests also improved. Therefore, the effect of GO as a nucleation site has a positive effect on the cement paste nano-properties at advanced ages.</p></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Pages 294-303"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317524000050/pdfft?md5=3f471319f2d0b2d8a783dfe04226eafb&pid=1-s2.0-S0366317524000050-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140774180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-01DOI: 10.1016/j.bsecv.2024.04.001
The use of natural zeolites as precursors offers a valuable alternative in the search for new materials applied to zeolite synthesis. Each study focused on the interzeolitic conversion method plays a fundamental role in understanding the evolution from one zeolite to another. In this study, a natural zeolite containing the crystalline phases of clinoptilolite and mordenite, with HEU and MOR topologies, respectively, as per the coding assigned by the IZA, was employed as a precursor. Combined with potassium–aluminum hydroxide solutions at two different concentrations, followed by a conventional hydrothermal process with durations of 50 and 90 h, characterization of both the precursor and resulting zeolite was performed. A conversion mechanism was proposed based on the structural similarity between the initial and target zeolites. To support these conclusions, characterization techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, Fourier-transform infrared spectroscopy, inductively coupled plasma optical emission spectroscopy, and nitrogen adsorption were utilized. This process represents a potential pathway for the synthesis of merlinoite-type zeolites, MER.
使用天然沸石作为前驱体为寻找用于沸石合成的新材料提供了宝贵的选择。每项侧重于沸石间转化方法的研究在了解从一种沸石到另一种沸石的演变过程中都发挥着重要作用。在本研究中，采用了一种天然沸石作为前驱体，该沸石含有clinoptilolite和mordenite的结晶相，根据国际沸石协会的编码，分别具有HEU和MOR拓扑结构。结合两种不同浓度的氢氧化钾-铝溶液，再经过 50 和 90 小时的传统水热过程，对前驱体和生成的沸石进行了表征。根据初始沸石和目标沸石之间的结构相似性，提出了一种转换机制。为了支持这些结论，我们使用了 X 射线衍射、扫描电子显微镜、能量色散 X 射线光谱、傅立叶变换红外光谱、电感耦合等离子体光发射光谱和氮吸附等表征技术。这一过程是合成梅里诺石型沸石、MER 的潜在途径。
{"title":"Interzeolite conversion of a clinoptilolite-rich natural zeolite into merlinoite","authors":"","doi":"10.1016/j.bsecv.2024.04.001","DOIUrl":"10.1016/j.bsecv.2024.04.001","url":null,"abstract":"<div><p>The use of natural zeolites as precursors offers a valuable alternative in the search for new materials applied to zeolite synthesis. Each study focused on the interzeolitic conversion method plays a fundamental role in understanding the evolution from one zeolite to another. In this study, a natural zeolite containing the crystalline phases of clinoptilolite and mordenite, with HEU and MOR topologies, respectively, as per the coding assigned by the IZA, was employed as a precursor. Combined with potassium–aluminum hydroxide solutions at two different concentrations, followed by a conventional hydrothermal process with durations of 50 and 90<!--> <!-->h, characterization of both the precursor and resulting zeolite was performed. A conversion mechanism was proposed based on the structural similarity between the initial and target zeolites. To support these conclusions, characterization techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, Fourier-transform infrared spectroscopy, inductively coupled plasma optical emission spectroscopy, and nitrogen adsorption were utilized. This process represents a potential pathway for the synthesis of merlinoite-type zeolites, MER.</p></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 4","pages":"Pages 279-293"},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0366317524000062/pdfft?md5=da1a8a0d5353cc725b1331df04fdbff7&pid=1-s2.0-S0366317524000062-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140771237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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