通过在空气/水界面上的横向分离域俯冲形成的不对称胶体多层

IF 3.2 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Hojoon Yoon, Baekmin Q. Kim, SeoYoung Choi, EunSuk Lee, Jongmin Q. Kim, KyuHan Kim
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引用次数: 0

摘要

我们提出了一种界面组装策略,通过在空气-水界面上侧向压缩侧向分离的颗粒微域来构建不对称多层胶体膜。这些由聚苯乙烯(PS)和二氧化硅(SiO2)颗粒组成的微畴作为横向模板,在单层坍塌过程中指导垂直重排。利用具有不同界面吸附亲和力的亲水性PS和SiO2颗粒,我们证明了耗尽相互作用和压缩诱导的不稳定性诱导了区域选择性俯冲,在这个过程中,一种类型的颗粒区域被驱动到另一种类型的颗粒区域之下。具体来说,亲水性较强的二氧化硅域优先坍塌并俯冲到亲水性较弱的PS域之下,导致明显的垂直不对称性集中在域边界处。Langmuir等温线分析和SEM成像结果表明,通过改变压缩距离和消耗物浓度,可以调节层的横向偏析程度和垂直厚度。较低的耗尽浓度降低了耗尽压力,促进了颗粒的脱附,并使形成更宽、更不对称的多层结构。重要的是,即使颗粒类型的相对润湿性相反,这种组装框架仍然有效。通过在PS上引入磺酸官能团,我们将其转化为高度亲水性的物质。调节亚相pH值以抑制SO3H解离,使两种颗粒类型在界面上吸附。在酸性条件下,PS-SO3H颗粒首先坍塌并俯冲到二氧化硅域下,形成反向分层。这一反演证实,俯冲驱动的组合并不局限于特定的润湿性配对,而是受动态界面能量学和区域相互作用的支配。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Formation of Asymmetric Colloidal Multilayers via Subduction of Laterally Segregated Domains at the Air/Water Interface

Formation of Asymmetric Colloidal Multilayers via Subduction of Laterally Segregated Domains at the Air/Water Interface

Formation of Asymmetric Colloidal Multilayers via Subduction of Laterally Segregated Domains at the Air/Water Interface

We present an interfacial assembly strategy for constructing asymmetric multilayered colloidal films through lateral compression of laterally segregated particle microdomains at the air–water interface. These microdomains—composed of polystyrene (PS) and silica (SiO2) particles—serve as lateral templates that direct vertical rearrangement during monolayer collapse. Utilizing hydrophilic PS and SiO2 particles with distinct interfacial adsorption affinities, we demonstrate that depletion interactions and compression-induced instabilities induce domain-selective subduction, a process in which one type of particle domain is driven beneath another. Specifically, more hydrophilic silica domains preferentially collapse and subduct beneath less hydrophilic PS domains, resulting in pronounced vertical asymmetry concentrated at the domain boundaries. Langmuir isotherm analysis and SEM imaging reveal that both the lateral extent of domain segregation and the vertical thickness of the resulting multilayers can be tuned by varying the compression distance and depletant concentration. Lower depletant concentrations reduce depletion pressure, facilitating enhanced particle desorption and enabling the formation of broader and more asymmetric multilayer structures. Importantly, this assembly framework remains effective even when the relative wettability of the particle types is reversed. By introducing sulfonic acid functional groups onto PS, we transform it into a highly hydrophilic species. Adjusting subphase pH to suppress SO3H dissociation allows both particle types to adsorb at the interface. Under acidic conditions, the PS–SO3H particles collapse first and subduct beneath silica domains, producing inverted stratification. This inversion confirms that the subduction-driven assembly is not limited to specific wettability pairings, but instead governed by dynamic interfacial energetics and domain interactions.

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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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