揭示了基于地质聚合物材料的非凡潜力,利用二氧化的合并
Jingming Cai1, Yujin Yuan1, Xiang Xi2
1Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, 211102, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 3, 2023
概括
这项研究开发了使用二氧化 (MnO2) 的新型地质聚合物热电 (TE) 材料. 改进后的材料显示出更好的机械强度,并显著提高了建筑物可持续能源生产的Seebeck系数.
科学领域:
- 材料科学 材料科学 材料科学
- 可持续的建筑 可持续的建筑
- 能源转换 能源转换
背景情况:
- 热电 (TE) 建筑材料通过将温度梯度转化为电力,为可持续建筑提供了一条道路.
- 地质聚合物是 TE 材料的有希望的结合剂,因为它们的耐用性和低环境影响.
- 二氧化 (MnO2) 被探索为一种改性剂,以增强地质聚合物特性.
研究的目的:
- 研究二氧化 (MnO2) 对地质聚合过程和地质聚合复合材料的热电特性的影响.
- 优化组合以提高机械强度和发电.
- 了解用于增强热电性能的潜在机制.
主要方法:
- 进行了热量测量实验,以分析不同MnO2含量的地聚合动力学.
- 对地质聚合物复合材料进行了机械测试,特别是压力强度测试.
- 测量了Seebeck效应,以量化改性材料的热电性能.
主要成果:
- 加入高达5%的重量MnO2增强了地质聚合物复合物的压力强度,达到最大36.8MPa.
- 地质聚合物复合物的Seebeck系数随着MnO2的添加而显著增加,在5%的MnO2下达到4273μV/°C.
- 塞贝克系数的提升与状态密度的增加和放松时间的减少有关.
结论:
- 二氧化 (MnO2) 有效地修改地质聚合物材料,以提高热电性能和机械强度.
- 优化的MnO2含量 (约为5%) 对于最大限度地提高Seebeck系数和压力强度至关重要.
- 这些发现表明,有可能开发用于可持续能源应用的先进热电建筑材料.
相关概念视频
Pozzolans
137
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
137
Additives and Fillers in Concrete
110
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
110
Types of Cement II
124
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
124
Hydration of Cement
271
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
271
Superplasticizers
98
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
98
Plasticizers
86
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
86


