多层交替结构化的酸盐水凝具有特殊的灵活性和电磁屏蔽性能
Taian He1, Chuyang Liu1, Zhiwei Chen1
1School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
Journal of colloid and interface science
|June 15, 2025
概括
这项研究开发了一种新型的多层水凝,使用碳纳米管 (CNT) 和 (Co) 纳米粒子进行优质的电磁干扰 (EMI) 屏蔽. 该材料提供了出色的灵活性和吸收能力,解决了灵活电子应用中的污染问题.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 聚合物科学 聚合物科学
背景情况:
- 灵活的电子需求先进的电磁屏蔽材料具有高的灵活性和吸收.
- 现有的导电水凝往往表现出不够的屏蔽性能和环境问题.
研究的目的:
- 开发一种基于水凝的新型电磁屏蔽材料,具有增强的灵活性和吸收能力.
- 为了研究碳纳米管 (CNTs) 和 (Co) 纳米粒子在电磁屏蔽的水凝中的协同效应.
主要方法:
- 制造一个多层水凝膜,在一个交替的模式中结合CNTs和Co纳米粒子.
- 使用键在水凝结构内进行机械增强.
- 电磁屏蔽性能,机械灵活性和吸收-反射-再吸收机制的表征.
主要成果:
- Co-CNT 水凝膜表现出有利的介电和磁性损失性能.
- 多层结构通过"吸收-反射-再吸收"机制增强了电磁波散射.
- 最终的CNT/Co-CNT多层水凝在0.7毫米厚度下达到41dB的屏蔽效率,吸收率/总屏蔽率>85%.
结论:
- 与现有材料相比,开发的CNT/Co-CNT多层水凝提供了优越的电磁屏蔽性能和机械灵活性.
- 这项研究提出了一种创新的方法,用于创建智能灵活的EMI屏蔽材料.
- 潜在的应用包括可穿戴的智能设备和军事技术.
相关概念视频
Electrolyte and Nonelectrolyte Solutions
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
Ions as Acids and Bases
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Solubility
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Ionic Strength: Effects on Chemical Equilibria
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary cation—the calcium...
In this solution, the primary cation—the calcium...
Ion Exchange
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Theory of Strong Electrolytes
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...


