A time-domain nuclear magnetic resonance (TD-NMR) as a tool to characterize affinity between partially hydrophobic silica nanoparticles and ethanol/hexane mixtures

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2024-08-05 DOI:10.1016/j.apt.2024.104593

Atsushi Teramae , Chika Takai-Yamashita , Junko Ikeda , Seiji Yamashita , Motoya Sugiura , Ariga Kato , Yutaka Ohya , Paul Kinyanjui Kimani

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Abstract

Affinity between partially hydrophobic silica nanoparticles and organic solvents (ethanol and hexane) as dispersing medium has been characterized with change in the relaxation time obtained by a time-domain nuclear magnetic resonance (TD-NMR). Different chain lengths (denoted as C3, C6, and C12) were utilized as surface modifiers for the particles and the modification ratio was controlled. For ethanol, the longer chain length and higher modification ratio showed the higher affinity while for hexane, vice versa even though a quite poor affinity appeared in whole conditions. We hypothesize that the ethanol molecules could be attracted to residual silanol groups among long-chain length-functional groups. In order to prove, affinity of the partially hydrophobic silica nanoparticles with ethanol/hexane mixture has been investigated. In the range from 60 to 80 vol% of hexane, relaxation time of the C12-modified silica nanoparticles (modification ratio was 1.4 /nm²) quickly decreased. When the residual silanol was additionally modified with C3, the corresponding decrease disappeared. The TD-NMR has an effective tool to detect the change in the surface affinity of the partially hydrophobic nanoparticles even if they showed the same hydrophobicity.

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将时域核磁共振（TD-NMR）作为表征部分疏水性二氧化硅纳米颗粒与乙醇/正己烷混合物之间亲和力的工具

通过时域核磁共振（TD-NMR）获得的弛豫时间的变化，表征了部分疏水性二氧化硅纳米粒子与作为分散介质的有机溶剂（乙醇和正己烷）之间的亲和性。利用不同的链长（表示为 C3、C6 和 C12）作为颗粒的表面改性剂，并控制改性比例。对于乙醇来说，链长越长、改性比例越高，亲和力就越强；而对于正己烷来说，尽管在整个条件下亲和力都很差，但亲和力也越强。我们推测乙醇分子可能被长链长度官能团中的残余硅醇基团所吸引。为了证明这一点，我们研究了部分疏水性二氧化硅纳米粒子与乙醇/正己烷混合物的亲和性。在己烷含量为 60% 至 80% 的范围内，C12 改性纳米二氧化硅（改性比为 1.4 /nm2）的弛豫时间迅速缩短。当残留的硅烷醇被 C3 额外修饰时，相应的减少消失了。TD-NMR 是检测部分疏水性纳米粒子表面亲和性变化的有效工具，即使它们的疏水性相同。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)