The assembly of uniform thin films with functional silica nanoparticles (FSNPs) by the layer-by-layer (LbL) technique has been studied to provide rough, robust, and functional surfaces. Initially, monodisperse silica nanoparticles (SNPs) have been synthesized by the reverse microemulsion method. Then SNPs have been functionalized using amino silane coupling agents with various chain lengths and amine positions such as (3-aminopropyl)trimethoxy silane (APS), N-[3-(trimethoxysilyl)propyl]-N,N,N-trimethylammonium chloride (NPC), N-(6-aminohexyl)aminopropyltrimethoxy silane (AHAPS), and 3-aminopropyl(dimethyl)ethoxy silane (APDMES). The amine-functionalized silica nanoparticles have been characterized using zeta potential, Fourier Transform-Infrared Spectroscopy (FT-IR), and ¹H Nuclear Magnetic Resonance (NMR) spectroscopy to prove the existence of amine groups on the silica surface. Scanning electron microscopy (SEM) images have revealed that the LbL assembled thin film coatings of FSNPs are uniform and monodisperse. The thickness measurements of the coatings have been conducted by spectroscopic ellipsometry. Water contact angle measurements were performed to analyze the alteration of surface features with functional groups. The roughness, topography, and elastic modulus of the assembled thin-film coatings were probed by atomic force microscopy (AFM). The dispersion of AHAPS-FSNPs has indicated superior colloidal stability than other FSNPs because of their secondary amines creating steric hindrance. Moreover, AHAPS-FSNPs film exhibited the lowest coating thickness and the highest elastic modulus comparing with the other FSNPS because of their crosslinking and hydrogen-bonding ability. Briefly, in this work, LbL assembly of the amine FSNPs was established by an extensive investigation to form rough and functional surfaces for many demanding applications.

已经研究了通过逐层 (LbL) 技术组装具有功能性二氧化硅纳米粒子 (FSNP) 的均匀薄膜，以提供粗糙、坚固和功能性的表面。最初，单分散二氧化硅纳米粒子 (SNP) 已通过反微乳液法合成。然后使用具有各种链长和胺位置的氨基硅烷偶联剂对 SNP 进行功能化，例如（3-氨基丙基）三甲氧基硅烷（APS）、N-[3-（三甲氧基甲硅烷基）丙基]-N,N,N-三甲基氯化铵（ NPC)、N- (6-氨基己基)氨基丙基三甲氧基硅烷 (AHAPS) 和 3-氨基丙基(二甲基)乙氧基硅烷 (APDMES)。使用 zeta 电位、傅里叶变换红外光谱 (FT-IR) 和¹H 核磁共振 (NMR) 光谱证明二氧化硅表面上存在胺基团。扫描电子显微镜 (SEM) 图像显示，FSNP 的 LbL 组装薄膜涂层均匀且单分散。涂层的厚度测量是通过光谱椭偏法进行的。进行水接触角测量以分析具有官能团的表面特征的改变。通过原子力显微镜 (AFM) 探测组装薄膜涂层的粗糙度、形貌和弹性模量。AHAPS-FSNPs 的分散显示出比其他 FSNPs 优越的胶体稳定性，因为它们的仲胺会产生空间位阻。而且，与其他 FSNPS 相比，AHAPS-FSNPs 薄膜表现出最低的涂层厚度和最高的弹性模量，因为它们具有交联和氢键能力。简而言之，在这项工作中，胺 FSNP 的 LbL 组装是通过广泛的研究建立的，以形成用于许多苛刻应用的粗糙和功能表面。