Structural Arrangement of Hexadecyltrimethoxysilane on Diatomaceous Earth.

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-09-29 DOI:10.1021/acs.langmuir.5c01907

Helanka J Perera,Frank D Blum

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引用次数: 0

Abstract

Nano-microscale morphologies of hexadecyltrimethoxysilane (HDTMS), an alkylsilane, adsorbed on diatomaceous earth (DE) were probed with temperature-modulated differential scanning calorimetry (TMDSC), thermogravimetric analysis (TGA), X-ray spectroscopy, and Fourier transform infrared spectroscopy. Initially, smaller amounts of HDTMS adsorbed resulted in a disorganized film with a decomposition temperature higher than that observed for bulk HDTMS due to the molecules being directly attached to the surface. FTIR and TMDSC results confirmed that at smaller adsorbed amounts, the molecules were largely amorphous and became more crystalline at larger adsorbed amounts. At very small adsorbed amounts, it was not possible to characterize the alkylsilane at submonolayer coverage, but at larger adsorbed amounts, it was found that the enthalpies measured increased exponentially, reaching the enthalpy value for the bulk HDTMS. The exponential growth scale was found to be around 1.5 mg HDTMS/m2 of DE surface, comparable to that found on fumed silica, in spite of the much smaller specific surface area and different morphology of DE. The understanding of the micro-nanomorphology is of significant relevance to the use of treated DE, especially in coatings.

查看原文本刊更多论文

硅藻土上十六烷基三甲氧基硅烷的结构排列。

采用温度调制差示扫描量热法（TMDSC）、热重分析（TGA）、x射线光谱和傅里叶变换红外光谱对硅藻土（DE）吸附的烷基硅烷十六烷基三甲氧基硅烷（HDTMS）的纳米微尺度形貌进行了研究。最初，由于分子直接附着在表面，少量的HDTMS吸附导致分解温度高于大块HDTMS观察到的无组织膜。FTIR和TMDSC结果证实，在较小的吸附量下，分子基本上是无定形的，在较大的吸附量下，分子变得更结晶。在非常小的吸附量下，不可能表征亚单层覆盖的烷基硅烷，但在较大的吸附量下，发现测量的焓呈指数增长，达到体HDTMS的焓值。尽管DE的比表面积小得多，形貌也不同，但指数增长尺度约为1.5 mg HDTMS/m2的DE表面，与气相二氧化硅相当。对微纳米形态的理解对处理DE的使用具有重要意义，特别是在涂料中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).