Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Fang Sun,Xueyu Pang,Jianqiang Wei,Jing Zeng,Jiacheng Niu
Understanding the synthesis process of Portland cement's various mineral phases and the phase interactions during hydration is highly critical for the design and optimization of cement-based materials. In this work, by using an optimized solid-state reaction method, three pure clinker phases (alite, belite and ferrite) and two polyphase phases (alite-belite and alite-ferrite-belite) of Portland cement were synthesized. The optimized method is featured with high-quality product yield, short burning time without regrinding or reburning. The factors that influence synthesis results, such as crystallinity/purity of the synthesized pure phases, were discussed based on X-ray powder diffraction (XRD) tests along with Rietveld refinement analysis with an external standard. The hydration behavior of the synthesized phases in monophase, polyphase as well as mixture states was investigated via isothermal calorimetry along with thermogravimetry and XRD. The results indicate that alite and belite have relatively little interactions during hydration, while the hydration rate of ferrite can be strongly inhibited in the presence of alite both in mixture and polyphase states.
研究领域:
材料科学
·
水泥化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chang Chen,Feifei Peng,Ruyi Zhang,Shaowu Jiu,Yanxin Chen
Organic coatings cannot provide long-term corrosion protection to steel bars in sand-based autoclaved aerated concrete because they are prepared at high temperatures and pressures. Herein, potassium silicate, zinc silicate, and aluminum powder were used as the raw materials to prepare inorganic aluminum powder–modified zinc silicate–potassium silicate coatings with anticorrosive properties. The physical, mechanical, microscopic, and anticorrosion properties of the prepared inorganic coatings were investigated using X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy , thermogravimetry–differential scanning calorimetry, scanning electron microscopy, electrochemical impedance spectroscopy , and potentiodynamic polarization. The results showed that aluminum powder increased the density of the zinc silicate–potassium silicate coatings and significantly improved the corrosion resistance and mechanical properties of the coatings. The prepared coatings exhibited stable qualities with no heat absorption and release before 317°C. The adhesive strength and impact resistance of the coatings were as high as 1.65 MPa and 50 kg·cm, respectively. The electrochemical test results showed that the coating resistance ( R c ), charge-transfer resistance ( R ct ), and polarization resistance ( R p ) of the 5.5–50Zn 2 SiO 4 –40Al coating were 7835, 135,915, and 89,568 Ω·cm 2 , respectively, which exhibited the optimal corrosion resistance.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Qi Tao,Manyou Chen,Hongping He,Sridhar Komarneni
Mixed metal oxides (MMO) were transformed to phyllosilicate in the presence of silicate anions under hydrothermal conditions. The product was shown to be saponite with a trioctahedral layer structure by characterization with XRD , FTIR , 27 Al and 29 Si MAS NMR, HRTEM and TG-DTG. The formation of saponite was through a rehydration-dissolution-precipitation pathway, involving the critical steps such as the reconstruction of MMO to hydrotalcite (Ht), exsolution of Al 3+ from Ht, condensation of metasilicate anions with Ht, and finally crystallization of saponite. Isomorphous substitution of Al 3+ for Si 4+ in silicate oligomers is the key for the above conversion, which generated the negative charge necessary for the condensation between the silicate oligomers and Ht surface and the formation of 2:1 saponite TOT layers. High pH value (over 14.0) favored the condensation of silicate oligomers and led to crystallization of saponite. Thus, we report a novel method for the crystallization of saponite.
研究领域:
矿物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Xuyang Zhang,Lili Hu,Jinjun Ren
The detailed local structures of fluoroborosilicate glasses with the compositions of (50 + x)SiO2–(20 – x)B2O3–10Na2O–10NaF–10YF3 (x = 0, 5, 10, 15 mol %) were investigated by advanced one- and two-dimensional solid-state nuclear magnetic resonance (SSNMR) techniques. The borosilicate glass network is characterized by 29Si and 11B magic angle spinning NMR (MAS NMR) spectra. 29Si MAS spectra show that the silicate network strengthens with the decrease of the B2O3 content. Two three-coordination boron species (B(3)-ring, B(3)-nonring) and two four-coordination boron species (BO4, BO3F) are observed in the 11B MAS spectra. The two types of B(4) species are identified by 11B triple-quantum magic angle spinning (TQMAS) and J-coupling-based 11B{19F} heteronuclear multiple quantum coherence (J-HMQC) methods. The F– species are confirmed by 19F MAS spectra and a 19F{23Na} rotational echo double resonance (REDOR) method, revealing the existence of Na–F–B and multiple Na–F–Y linkages. The clustering of F– ions is proved by 19F static spin echo results, which indicate that B3+ ions have a dispersive effect on F– ions. 11B/23Na REDOR results show that the distribution of Na+ around B(3) and B(4) is similar, and independent of the content of B2O3. On the basis of these results, a quantitative atomic structure evolution with glass compositions is investigated.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 2
·177
·
IF 2.8
Zijian Mo,Zupeng Mo,Kaisen Guo,Zhiyun Yu,Huan He,Tianquan Liang
Calcium–magnesium–alumina–silicate (CMAS), as an environmental deposit, deposits on engine components and causes serious damage to traditional thermal barrier coatings (TBCs) at high temperatures. The rare-earth silicate apatite dense reaction layer is regarded as a promising strategy to prevent TBCs from molten CMAS penetration and corrosion. The interactions between the Gd2O3ceramic and CMAS are discussed at various temperatures and times in the study. The main reaction products are gadolinium silicate apatite (Ca2Gd8(SiO4)6O2, Gd-apatite) and melilite phases. Within the first 15 min of interaction, a thin, continuous and dense reaction layer (DRL) consisting of Gd-apatite comes to form, and it thickens with increasing exposure temperature and time. The thickness of the DRL is ~0.8 μm after 15 min of the reaction at 1250 °C and it slowly increases to ~9.1 μm after a duration of 24 h at 1400 °C. This is attributed to CMAS infiltration along the grain boundaries of the Gd-apatite phases in the DRL. The growing rates of the Gd-apatite DRL decrease with reaction time and are significantly influenced by the temperature and the ability of the DRL to inhibit CMAS infiltration.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 109
·期 2
·523-533
·
IF 2.5
Hao Mingyuan,Chen Huanle,Xia Chenkang,Su Teng,Ma Chao,Miao Yang
Aluminum silicate nanofibers (ASNFs) have attracted significant attention due to their excellent stability and high-temperature properties. Al 2 O 3 -SiO 2 aerogel (ASAs) has high porosity and low thermal conductivity, but its mechanical properties need to be improved. Reinforcing aerogels with fibers can lead to remarkable enhancements in their properties. Reducing the fiber diameter has proven to be an effective means of improving the structural integrity and mechanical stability of aerogel composites. In the context of this study, we prepared aluminum silicate nanofibers (ASNFs) with a diameter of 170 nm through the utilization of electrostatic spinning. These ASNFs were then successfully integrated with aluminum silicate aerogels (ASAs) to create a novel composite material known as aluminum silicate nanofiber-reinforced Al 2 O 3 -SiO 2 aerogel (AS/ASNFAs). Its microstructure, mechanical properties and heat insulation properties have been researched. The results show that the compressive strength of AS/ASNFAs (0.44 MPa) is significantly higher than that of Al 2 O 3 -SiO 2 aerogel (0.16 MPa). Meanwhile, the AS/ASNFAs has high specific surface area (600 m 2 /g), low density (0.15 g/cm 3 ), and low thermal conductivity (0.026 W/(m·K)). This work provides a useful solution to improve the comprehensive properties of Al 2 O 3 –SiO 2 aerogel composites. Graphical
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Yangbo Qiu,Chao Wang,Ran Li,Lidong Feng,Shuaijun Yu,Jiangnan Shen,Long-Fei Ren,Jiahui Shao
Rapid development of semiconductor manufacturing and photovoltaic industry leads to significant generation of fluoride-rich and silica-rich wastewaters. Due to the emphasis on circular economy and resource recovery, there is a shift from regarding wastewater as waste to a recoverable resource. In this study, we present a uniquely designed dual-ion permeation Janus membrane (DPM)-assisted element reconstitution system (MERS) for selective recovery of high-value fluorosilicates from fluoride-rich and silica-rich wastewaters. The MERS with a configuration of cation-exchange membrane/bipolar membrane/DPM/anion-exchange membrane/cation-exchange membrane achieved HF formation in silica chamber and further SiF 6 2- generation from the reaction of HF with SiO 2 . Driven by the electric field, SiF 6 2- was then transported through DPM into acid chamber for fluorosilicates selective recovery. The DPM with positively-charged nanoporous substrate/negatively charged active layer enhanced electrostatic interaction for SiF 6 2- /H + transport and steric exclusion for coexisting foulants rejection. Ion transport mechanism analysis demonstrated DPM enhanced SiF 6 2- migration while inhibiting back diffusion by electrostatic interaction and steric exclusion. Through the application of DPM, MERS showed rejections over 99 % for nanoparticles and over 90 % for organics. Thus, MERS stably selectively recovered SiF 6 2- with recovery rate over 85 % and fluorosilicates purity over 99.5 %. Compared to traditional technologies, MERS achieved valuable resource recovery with the advantages of simple operation, small footprint and no secondary pollutant generation. Overall, this study provides a new strategy for simultaneous recovery of fluoride and silica from different waste streams, enabling a more sustainable strategy for semiconductor and photovoltaic industries development.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Interdisciplinary Materials
·
2025
·
IF 31.6
Wenping Ma,Zhibo Yang,Jinzhou Huang,Jiyi Huang,Mingxia Lu,Hongshi Ma,Chengtie Wu,Hongxu Lu
The bone marrow is essential for immune function, hematopoiesis, and skeletal system. The emergence of bone marrow organoids (BMOs) holds promise for addressing bone-related deficiencies, although maintaining BMOs homeostasis is still challenging, and their efficacy for tissue regeneration remains uncertain. Silicate biomaterials can provide distinctive biochemical clues by releasing bioactive ions, which are beneficial for regulating stem cell behaviors and developing cell functions. In this study, harnessing the bioactivities of silicate biomaterials, we engineered functional BMOs through the culture of mesenchymal stem cells (MSCs) and endothelial cells in a chemically defined medium, incorporating with calcium silicate nanowires (CS) and magnesium silicate nanospheres (MSS). The resulting BMOs demonstrated robust preservation of endothelial networks, increased self-renewal of the mesenchymal compartment, and positive effects on hematopoietic stem cells. Co-culture experiments revealed that the engineered BMOs can significantly improve the activities of chondrocytes, MSCs, and Schwann cells, which are pivotal for tissue regeneration. Furthermore, the silicate biomaterials upregulated gene expression and signaling pathways in the domains of osteogenesis and angiogenesis. In a rabbit osteochondral repair model, BMOs induced by MSS notably enhanced osteochondral regeneration. Our study reveals the critical role of silicate biomaterials in augmenting BMOs homeostasis and function, providing an innovative and compelling strategy for future tissue regeneration.
研究领域:
生物医学工程
·
再生医学
·
组织工程
·
干细胞生物学
·
生物材料科学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2025
·
IF 8.5
Hairong Mao,Fuhao Cheng,Donald B. Dingwell,Wenjia Song
Environmental silicate deposits are among the most critical factors driving high-temperature degradation of thermal barrier ceramics, yet the intrinsic corrosion mechanisms remain insufficiently understood. Rare-earth zirconates (RE 2 Zr 2 O 7 ) have emerged as promising next-generation candidates, but their resistance to molten silicate attack varies widely with the choice of rare earths. Here, we systematically investigate 15 RE 2 Zr 2 O 7 compositions based on La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Tm, Yb, Lu, and Sc. High-temperature wetting and long-term corrosion experiments at 1300 °C reveal a multivariate dependence of molten silicate spreading and degradation on RE ionic radius, which we examine in terms of lattice energy, RE–O bond ionicity, optical basicity, apatite formation enthalpy, and RE content in fluorite products. Two distinct corrosion modes can be identified: exemplified by exhibits dissolution-controlled interfaces lacking protective barriers (e.g., Tm zirconates) and precipitation-controlled interfaces composed of either dense RE/Ca-apatite/fluorite (e.g., La zirconates) or Sc-garnet layers (Sc zirconates) that act as protective barriers. These results elucidate the fundamental role of rare-earth chemistry in CMAS reactivity and provide mechanistic guidance for designing compositionally optimized (high-entropy) zirconates with superior environmental durability for advanced aero-engine and gas turbine applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2024
·Vol. 24
·期 6
·2309-2317
·
IF 2.8
Mi Na,Yang Min,Wang Xiaohan,Sun Qian,He Jianzhou,Deng Shaopo,Fan Tingting
Purpose The application of silicon could effectively alleviate Cd contamination in the soil. However, the interaction between silicon and Cd in soils is not well understood. Our research aims to investigate the mechanism of the impact of silicate on the sorption of Cd on metal oxides in soils. Materials and methods Sodium silicate and Cd(II) co-sorption on γ-Al 2 O 3 and goethite at pH 5.5 and 7.5 was studied using a combination of batch sorption experiments, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Results and discussion Silicate enhanced the sorption of Cd(II) onto γ-Al 2 O 3 at pH 5.5 and 7.5. However, the sorption of Cd(II) on goethite at pH 5.5 and 7.5 was only promoted when the silicate concentration reached 1 mmol L −1 . Cadmium(II) enhanced silicate sorption on γ-Al 2 O 3 at pH 5.5 and on goethite at pH 7.5, while it decreased silicate sorption on γ-Al 2 O 3 at pH 7.5 and had no significant effect on goethite at pH 5.5. At pH 5.5, Cd(II) reacted with silicate to generate Cd 2 SiO 4 , and Cd-Si-Al ternary complexes were formed on γ-Al 2 O 3 . At pH 7.5, silicate promoted the formation of Cd(OH) 2 on γ-Al 2 O 3 , which ultimately transformed into CdCO 3 . When silicate concentration reached 1 mmol L −1 , more silicate complexes were formed through the Fe-O-Si bound on goethite at both pH 5.5 and 7.5 to promote the adsorption of Cd(II) owing to its electronegative functional group on the surface of the complex. Conclusions The type of clay minerals, pH, and the presence of silicate all significantly affected Cd sorption. Furthermore, the sorption mechanism of Cd on γ-Al 2 O 3 and goethite in the presence of silicate has been elucidated. The above findings improve our understanding of the mechanism for immobilizing Cd in soils using silicon-containing materials.
研究领域:
土壤科学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Yiwen Hu,Jieliang Wang,Zhao Cao,Xu Wu,Wenda Lu,Weiwei Wang,Wenli Liu
Bastnaesite is an important strategic resource. Since the calcium-bearing gangue minerals in the pulp can dissolve and release Ca 2+ ions, Ca 2+ ions and sodium silicate have a co-depression effect on bastnaesite flotation, which will affect the separation and purification of bastnaesite. In this study, the mechanism of eliminating the co-depression effect using ethylene diamine tetraacetic acid (EDTA) was studied by micro-flotation, bench-scale flotation, zeta potential, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM)–energy spectrometry (EDS), contact angle and DFT calculations measurements. Micro-flotation results show that the addition of EDTA can effectively eliminated the co-depresses effect of Ca 2+ ions and sodium silicate. Bench-scale flotation tests showed that a high-quality rare earth (REE) ore concentrate with higher grade and recovery (62.35 % and 62.08 %, respectively) could be enriched by adding EDTA. Zeta potential results show that the combination of Ca 2+ ions and EDTA than with Ca 2+ ions alone, the surface potential of bastnaesite was significantly negative. XPS shows that EDTA prevented Ca-SiO 3 precipitation between Ca 2+ ions and sodium silicate by complexing Ca 2+ ions, which hindered the adsorption of sodium silicate to bastnaesite. SEM-EDS show that the addition of EDTA between Ca 2+ ions and sodium silicate, Ca 2+ ions had desorbed from the bastnaesite surface. Density functional theory (DFT) calculation showed that the adsorption energy of EDTA and Ca 2+ ions was much smaller than that of sodium silicate and Ca 2+ ions and Ca 2+ ions and mineral surface.
研究领域:
矿物学
·
浮选化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Zhao Cao,Zeyu Cheng,Jieliang Wang,Yongdan Cao
Bastnaesite is an important rare earth mineral and is usually beneficiated by flotation . Sodium silicate is commonly used to depress calcium-bearing gangue minerals, however it can also depress bastnaesite when Ca 2+ ions exist in the pulp. In this study, the effect of Ca 2+ ions and sodium silicate individually or in combination on bastnaesite flotation was studied through micro-flotation, zeta potential , fluorescence spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements. Micro-flotation results show that the combination of Ca 2+ ions and sodium silicate depresses bastnaesite more severely due to their synergistic effect. Zeta potential results show that the combination renders the surface potential of bastnaesite negatively shifted more significantly. Fluorescence spectroscopy shows that the combination decreases the surface hydrophobicity of bastnaesite more severely. XPS shows that the combination increases the adsorption of sodium silicate on bastnaesite by forming hydrophilic Ca-SiO 3 precipitate, which causes more serious depression on bastnaesite flotation.
研究领域:
矿物学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）