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< Page ,Total 61 >
Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin SCIE
期刊论文 | 2024 | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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Abstract :

The issue of slow early setting and strength development is a common problem faced by natural hydraulic lime (NHL) in both historic building restoration projects and modern construction. This study aims to reveal the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin and its effect by natural carbonation. The results demonstrate that metakaolin could promote the setting times of NHL and generally exhibit a significant enhancement effect on the mechanical strength. Additionally, the drying shrinkage of NHL mortar can be effectively reduced by adding 10% metakaolin. In terms of hydration products, C(4)ACH(11) and C-S-H are identified as primary products during the early stages for M-NHL mortars, along with other hydration products such as C-A-(S)-H being formed later on. At longer ages, the carbonation reactions occur primarily with C-S-H and C-A-(S)-H phases, while decomposition or transformation into other phases is more likely for C(4)ACH(11). Interestingly, when M-NHL mortars with 10% metakaolin, it not only promotes early hydration but also enhances long-term carbonation processes. The carbon dioxide uptake effect (similar to 20% mass %) is also found significant, and the low carbon effect in the whole life cycle means that M-NHL is environmental friendly materials. The pozzolanic effect induced by metakaolin reduces macropores and refines pore size within M-NHL system, which helps maintain high pore connectivity coefficient as well as effective porosity and more effective pathways conducive to inward transportation of CO2 gas, thereby promoting the carbonation process.

Keyword :

Natural hydraulic lime Natural hydraulic lime Microporous structure Microporous structure Metakaolin Metakaolin Natural carbonation Natural carbonation Hydration product Hydration product

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GB/T 7714 Zhang, Dajiang , Wang, Yali , Xu, Dong et al. Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin [J]. | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY , 2024 .
MLA Zhang, Dajiang et al. "Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin" . | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2024) .
APA Zhang, Dajiang , Wang, Yali , Xu, Dong , Cui, Suping , Wang, Dongmin . Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin . | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY , 2024 .
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Effect of N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium salt and triethanolamine on the hydration and compressive strength of steel slag-cement composite systems: A comparative study SCIE
期刊论文 | 2024 , 33 , 6744-6755 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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To solve the problem of low cementitious activity of steel slag (SS), N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium salt (BES-Na) and triethanolamine (TEA) were used in this study to improve the hydration activity of SS. However, there are no comparative studies on the effects of BES-Na and TEA on the hydration of SS-Portland cement (PC) systems. This study compared the hydration process and strength development of SS-PC systems in the presence of BES-Na and TEA, as well as the complexing ability of BES-Na and TEA. The results showed that both BES-Na and TEA improved the early compressive strength of SS-PC mortar, but TEA did not contribute to the late compressive strength, while BES-Na still improved the late compressive strength. At the same dosage, TEA accelerated aluminates hydration more than BES-Na and retarded/inhibited silicates hydration more than BES-Na. This difference in effect on hydration can be attributed to the difference in their complexing ability. TEA has a stronger complexing ability with metal ions than BES-Na, which is beneficial for accelerating aluminates hydration, but this not only prolonged the hydration induction period but also inhibited silicates hydration. BES-Na has a weaker complexing ability relative to TEA. Although BES-Na has a weaker accelerating effect on aluminates hydration, it has a lesser effect on silicates hydration and even accelerates silicates hydration at low dosage. This study also showed that BES-Na is an alternative additive to TEA, which could help expand the application of BES-Na in cementitious materials.

Keyword :

BES-Na BES-Na Steel slag Steel slag Complexation Complexation TEA TEA Compressive strength Compressive strength Hydration Hydration

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GB/T 7714 Chang, Lei , Cui, Suping , Liu, Hui et al. Effect of N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium salt and triethanolamine on the hydration and compressive strength of steel slag-cement composite systems: A comparative study [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 33 : 6744-6755 .
MLA Chang, Lei et al. "Effect of N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium salt and triethanolamine on the hydration and compressive strength of steel slag-cement composite systems: A comparative study" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 33 (2024) : 6744-6755 .
APA Chang, Lei , Cui, Suping , Liu, Hui , Wang, Jianfeng , Wang, Yali . Effect of N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium salt and triethanolamine on the hydration and compressive strength of steel slag-cement composite systems: A comparative study . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 33 , 6744-6755 .
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Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal SCIE
期刊论文 | 2024 , 12 (25) , 9351-9360 | ACS SUSTAINABLE CHEMISTRY & ENGINEERING
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This paper presents a method for efficiently removing nitrogen oxides produced during cement production by utilizing coal fly ash, a common substitute in cement raw materials. The surface acidity and reactive species content of coal fly ash were improved by acid-base modification to participate in the cement production process for efficient NOX removal. In this work, the activity of modified coal fly ash in the denitration reaction and the adsorption and reaction mechanism of NH3+NO+O-2 on its surface were explored. The research results show that the NO conversion of modified coal fly ash reaches more than 94% in the range of 800-1000 degree celsius. The modification process of base activation and acid precipitation promoted the formation of pores and the exposure of active components on the surface of the coal fly ash, increasing the number of acidic sites and oxygen vacancies. The DRIFTS results indicated that NH3 and NO were coadsorbed on the modified coal fly ash, formed active intermediates, and eventually decomposed into N-2, achieving the high efficiency of NOX removal. This study provides an efficient method to remove NOX from cement production using modified coal fly ash, which gives a new idea for low-carbon cement production.

Keyword :

reaction mechanism reaction mechanism adsorption adsorption NOX removal NOX removal coal fly ash coal fly ash SNCR SNCR

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GB/T 7714 Meng, Lingqin , Cui, Suping , Wang, Yali et al. Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal [J]. | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2024 , 12 (25) : 9351-9360 .
MLA Meng, Lingqin et al. "Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal" . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING 12 . 25 (2024) : 9351-9360 .
APA Meng, Lingqin , Cui, Suping , Wang, Yali , Zhang, Duan , Ma, Xiaoyu . Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2024 , 12 (25) , 9351-9360 .
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Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展
期刊论文 | 2024 , (02) , 1-18 | 材料导报
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Abstract :

控制大气中的氮氧化物的排放对环境和健康有着至关重要的作用,应用于NO_(x)去除的技术有很多,其中选择性催化还原技术(NH_(3)-SCR)是去除NO_(x)最有效的技术之一,利用CO去除NO_(x)为烟气脱硝提供了一种简单且低成本的技术(CO-SCR),直接催化分解NO被认为是去除NO_(x)最理想、最环保的技术。Cu离子分子筛作为去除NO_(x)的高效催化剂,具有宽温度窗口和良好的水热稳定性。本文综述了Cu交换分子筛在去除NO领域的研究进展,讨论了Cu离子分子筛在NH_(3)-SCR、CO-SCR以及直接催化分解NO中的应用,着重总结了Cu离子参与去除NO的反应机理,归纳了分子筛中Cu活性位点对性能的影响。此外,还讨论了铜离子分子筛的抗H_(2)O和SO_(2)中毒性能。展望了Cu离子分子筛未来可能的发展方向。

Keyword :

Cu离子分子筛 Cu离子分子筛 NH_(3)-SCR NH_(3)-SCR NO直接分解 NO直接分解 CO-SCR CO-SCR NO_(x)去除 NO_(x)去除

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GB/T 7714 孟令钦 , 崔素萍 , 甘延玲 et al. Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展 [J]. | 材料导报 , 2024 , (02) : 1-18 .
MLA 孟令钦 et al. "Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展" . | 材料导报 02 (2024) : 1-18 .
APA 孟令钦 , 崔素萍 , 甘延玲 , 王亚丽 , 马晓宇 . Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展 . | 材料导报 , 2024 , (02) , 1-18 .
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Study on the fluid-solid transition mechanism of natural hydraulic lime pastes: Consider the water to binder ratio and polycarboxylate superplasticizer SCIE
期刊论文 | 2024 , 453 | CONSTRUCTION AND BUILDING MATERIALS
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Natural hydraulic lime (NHL) is used as a grouting material in the restoration of ancient buildings, the formation and evolution of its early workability are crucial for the reliability of the restoration effects. This paper conducts an in-depth study on the effects of water to binder (w/b) ratio and polycarboxylate superplasticizer (SP) dosage on the viscoelastic properties of fluid-solid transition process in NHL paste through tests on the fluidity, rheological characteristics, micro-rheology, hydration heat release, and early phase composition. The results show that the fluidity of NHL paste significantly increases with increasing w/b ratio and SP dosage, while its yield stress and plastic viscosity show downward trend, and it has shear thinning characteristics. In the initial stage, elevated w/b ratio leads to the significant reduction in both macroscopic viscosity index (MVI) and elastic index (EI) of NHL paste, along with delayed rapid increases, the effect is even more pronounced by adding SP. High w/ b ratio or adding SP are able to enhance the dispersed state of solid particle in NHL pastes, the viscoelastic transition point of NHL paste is delayed and the viscoelastic transition time is prolonged. Increasing the w/b ratio and adding SP both inhibit the early dissolution and hydration of NHL paste, affecting the fluid-solid transition process. Overall, as the spatial network gradually develops by the solid particles dissolve and continue to hydrate, NHL paste undergoes a transition from a viscous fluid to an elastic semi-fluid state, exhibiting low strength and noticeable plasticity characteristics. With further hydration, NHL paste initiates consolidation and hardening processes, progressively transforming from a plastic semi-fluid into hardened paste.

Keyword :

Water to binder ratio Water to binder ratio Natural hydraulic lime Natural hydraulic lime Polycarboxylate superplasticizer Polycarboxylate superplasticizer Fluid-solid transition Fluid-solid transition Viscoelastic properties Viscoelastic properties

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GB/T 7714 Zhang, Dajiang , Xu, Dong , Wang, Yali et al. Study on the fluid-solid transition mechanism of natural hydraulic lime pastes: Consider the water to binder ratio and polycarboxylate superplasticizer [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 453 .
MLA Zhang, Dajiang et al. "Study on the fluid-solid transition mechanism of natural hydraulic lime pastes: Consider the water to binder ratio and polycarboxylate superplasticizer" . | CONSTRUCTION AND BUILDING MATERIALS 453 (2024) .
APA Zhang, Dajiang , Xu, Dong , Wang, Yali , Cui, Suping , Wang, Dongmin . Study on the fluid-solid transition mechanism of natural hydraulic lime pastes: Consider the water to binder ratio and polycarboxylate superplasticizer . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 453 .
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Effect of different hydration-carbonation processes on the reaction degree of cement SCIE
期刊论文 | 2024 , 451 | CONSTRUCTION AND BUILDING MATERIALS
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Carbonation curing of precast concrete components can address their low production efficiency and high carbon dioxide emissions. The effect of mechanical property enhancement and carbon dioxide absorption capacity of precast concrete components during carbonation curing is determined by the reaction degree of the cement, and achieving the desired reaction degree requires that the hydration and the carbonation reaction durations are coordinated. Herein, the effects of different hydration-carbonation processes on mechanical properties, the relationship between the degree of the hydration-carbonation reaction and mechanical properties, and the mechanism that affects the degree of the hydration-carbonation reaction were investigated. Results showed that the optimal hydration-carbonation reaction within the age of 1 d was 8 h of hydration combined with 16 h of carbonation. The compressive strength of the cement mortar by this reaction process was approximately 20 MPa higher than that of the 24 h hydration. Carbonation at the hydration stage near before reaching the peak hydration heat flow facilitates Ca2+ leaching from calcium silicate minerals, increasing the reaction degree of the cement and resulting in the highest mechanical property enhancement, which further promotes Ca2+ consumption in the cement pore solution and continued Ca2+ leaching from calcium silicate minerals.

Keyword :

Hydration-carbonation reaction Hydration-carbonation reaction Hydration stage Hydration stage Carbonation curing Carbonation curing

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GB/T 7714 Guo, Zhao , Wang, Yali , Pei, Tianrui et al. Effect of different hydration-carbonation processes on the reaction degree of cement [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 451 .
MLA Guo, Zhao et al. "Effect of different hydration-carbonation processes on the reaction degree of cement" . | CONSTRUCTION AND BUILDING MATERIALS 451 (2024) .
APA Guo, Zhao , Wang, Yali , Pei, Tianrui , Wang, Hui , Cui, Suping . Effect of different hydration-carbonation processes on the reaction degree of cement . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 451 .
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一种钢渣活性激发剂及其制备方法与应用 incoPat
专利 | 2023-01-29 | CN202310044236.4
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本发明涉及建筑材料外加剂领域,尤其是涉及一种钢渣活性激发剂及其制备方法与应用,通过以氨基酸、葡萄糖和有机溶剂为原料合成一种富含更多络合基团的糖胺,并调整与醇胺和无机盐的比例组成一种钢渣活性激发剂,对于提高转炉钢渣在建材领域中的应用有着积极的促进作用。

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GB/T 7714 王剑锋 , 周永芳 , 常磊 et al. 一种钢渣活性激发剂及其制备方法与应用 : CN202310044236.4[P]. | 2023-01-29 .
MLA 王剑锋 et al. "一种钢渣活性激发剂及其制备方法与应用" : CN202310044236.4. | 2023-01-29 .
APA 王剑锋 , 周永芳 , 常磊 , 刘辉 , 刘晓 , 马晓宇 et al. 一种钢渣活性激发剂及其制备方法与应用 : CN202310044236.4. | 2023-01-29 .
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矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文)
期刊论文 | 2023 , 51 (01) , 194-203 | 硅酸盐学报
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Abstract :

MnO_x/TiO_2催化剂的低温脱硝活性和稳定性是目前具有挑战性的研究方向。采用矿物极化效应对MnO_x/TiO_2催化剂进行了改性研究。适当细度的电气石对催化材料的脱硝性能有明显的改善,在较宽的温度范围内脱硝效率保持在90%以上,并延长了较高脱硝效率的持续时间。原位漫反射红外光谱分析结果表明,改性前后的催化剂遵循Langmuir–Hinshelwood机理,电气石极化可以加快反应气体的吸附速率,生成易于参与到后续反应的中间产物,从而提高脱硝性能。

Keyword :

Langmuir–Hinshelwood机理 Langmuir–Hinshelwood机理 矿物极化效应 矿物极化效应 催化剂 催化剂 原位漫反射红外光谱 原位漫反射红外光谱

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GB/T 7714 赫连一哲 , 崔素萍 , 马晓宇 et al. 矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文) [J]. | 硅酸盐学报 , 2023 , 51 (01) : 194-203 .
MLA 赫连一哲 et al. "矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文)" . | 硅酸盐学报 51 . 01 (2023) : 194-203 .
APA 赫连一哲 , 崔素萍 , 马晓宇 , 王亚丽 , 徐海英 . 矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文) . | 硅酸盐学报 , 2023 , 51 (01) , 194-203 .
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C-S-H纳米晶种及其对水泥水化硬化的促进作用综述
期刊论文 | 2023 , 37 (09) , 109-124 | 材料导报
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近些年来的研究发现,将一些纳米粒子加入到水泥中,可以为水化产物提供更多形核位点,降低水化产物的形核势垒,加快水泥的水化进程。这些纳米材料包括纳米SiO_2、纳米CaCO_3、纳米TiO_2、碳纳米管、纳米水化硅酸钙(C-S-H)等。其中,人工合成的纳米C-S-H晶种与水泥水化产物C-S-H凝胶具有相似的化学组成,是C-S-H凝胶的良好的形核基质,在众多晶种材料中,对水泥水化的加速作用最为显著,成为近年来的研究热点。到目前为止,众多学者围绕C-S-H微/纳米材料的成核方式、制备方法及对水泥水化的促进机理进行了大量研究,发现采用共沉淀法在聚合物存在的条件下制备的纳米C-S-H晶种成核剂遵循非经典成核方式,其具有纳米级的晶粒尺寸和良好的分散稳定性。将纳米C-S-H晶种以一定掺量加入到水泥中,可以充当水泥水化产物C-S-H凝胶的额外成核位点,极大地降低了C-S-H凝胶的成核势垒,有效地促进了水泥水化速率和早期强度的发展,尤其可以显著提升水泥1 d龄期以内的强度。与常用的早强剂相比,这种纳米C-S-H晶种成核剂除具有掺量低、早强效果好、对水泥混凝土耐久性无不利影响的优点外,还可以在一定程度上弥补辅助性胶凝材料(SCMs)早期强度增长缓慢的问题。因此,纳米C-S-H晶种在低温施工、滑模施工、预制混凝土制品生产等对早期强度要求较高的工程中具有良好的应用前景,有潜力成为水泥混凝土的新型早强剂。本文尝试对众多研究成果进行总结分析,从纳米C-S-H晶种的成核方式、制备方法、与聚合物的作用机理以及对水泥水化过程的影响等方面进行综述,在明确现有的规律和成果的基础上,分析了目前存在的不足,得出尚待继续研究的问题,以期为未来纳米C-S-H晶种的科学研究、工程应用提供理论基础和发展方向。

Keyword :

成核方式 成核方式 纳米水化硅酸钙 纳米水化硅酸钙 晶种 晶种 早期强度 早期强度 水化 水化

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GB/T 7714 唐芮枫 , 张佳乐 , 王子明 et al. C-S-H纳米晶种及其对水泥水化硬化的促进作用综述 [J]. | 材料导报 , 2023 , 37 (09) : 109-124 .
MLA 唐芮枫 et al. "C-S-H纳米晶种及其对水泥水化硬化的促进作用综述" . | 材料导报 37 . 09 (2023) : 109-124 .
APA 唐芮枫 , 张佳乐 , 王子明 , 崔素萍 , 王肇嘉 , 兰明章 . C-S-H纳米晶种及其对水泥水化硬化的促进作用综述 . | 材料导报 , 2023 , 37 (09) , 109-124 .
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三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究
期刊论文 | 2023 , (09) , 1-15 | 材料导报
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Abstract :

<正>三乙醇胺(TEA)作为水泥混凝土中常用的早强组分,对早期强度发展有显著的促进作用。近年来随着喷射混凝土和液体无碱速凝剂的快速发展,三乙醇胺以其优良的早强特性逐渐得到广泛应用。然而,不同条件下由三乙醇胺

Keyword :

早期强度 早期强度 凝结时间 凝结时间 三乙醇胺 三乙醇胺 水化 水化 速凝剂 速凝剂

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GB/T 7714 刘晓 , 谢辉 , 罗奇峰 et al. 三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究 [J]. | 材料导报 , 2023 , (09) : 1-15 .
MLA 刘晓 et al. "三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究" . | 材料导报 09 (2023) : 1-15 .
APA 刘晓 , 谢辉 , 罗奇峰 , 王子明 , 崔素萍 , 夏春蕾 . 三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究 . | 材料导报 , 2023 , (09) , 1-15 .
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