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Journal of Nanomaterials · 2013 · IF 1.547

Preparation and Enhancement of Thermal Conductivity of Heat Transfer Oil-Based MoS2 Nanofluids

Yuan-Xian Zeng,Xiu-Wen Zhong,Zhao-Qing Liu,Shuang Chen,Nan Li

The lipophilic MoS2 nanoparticles are synthesized by surface modification with stearic acid (SA). The heat transfer oil-based nanofluids, with the mass fraction of lipophilic nanoparticles varying from 0.25% up to 1.0%, are prepared and their thermal conductivity is determined at temperatures ranging from 40 to 200°C using an apparatus based on the laser flash method. It has been found that the nanofluids have higher thermal conductivity and the thermal conductivity enhancement increased not only with increasing mass fraction of nanoparticles, but also with increasing temperature in the range 40–180°C The results show a 38.7% enhancement of the thermal conductivity of MoS2 nanofluid with only 1.0% mass fraction at 180°C.

研究领域: 材料科学 · 热力学 · 化学工程

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JOURNAL OF CATALYSIS · 2025 · IF 6.5

MoS2 nanoparticles/MIL-100(Fe) heterojunction with Type II interfacial charge transfer for efficient photocatalytic nitrogen reduction

Qi Chen,Xingxing Huang,Cheng Liu,Yueling Chen,Jionghua Wu,Jimmy C. Yu,Ling Wu

The attainment of rapid charge mobility and effective N 2 activation is of critical importance for photocatalytic nitrogen fixation but it has always been a challenge. Such challenge may be met by the construction of a Type II MoS 2 nanoparticles/ MIL-100(Fe) heterojunction photocatalyst. The new material possesses charge migration channels that facilitate the separation of photogenerated carriers. This charge redistribution during photocatalysis is confirmed by experimental results showing a decrease of charge density on the Fe species and an increase of that on Mo. Moreover, DFT calculations show that the adsorption of N 2 and H 2 O is more likely to occur on Fe sites and Mo sites, respectively. These findings clearly suggest a drastically improved spatial isolation of reduction and oxidation sites on the photocatalyst as compared to pristine MIL-100(Fe). The optimized MoS 2 /MIL-100(Fe) exhibits a NH 4 + yield rate of 1.29 μmol·h −1 as excellent utilization of photoinduced electron-hole pairs and effective adsorption and activation of N 2 become possible. This work offers an insight on the synergy of heterojunction engineering with coordinated activation for photocatalytic ammonia synthesis.

CAS / MDL: 2672-58-4

研究领域: 材料科学 · 催化 · 纳米技术 · 化学工程 · 理论化学

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Preparation and Enhancement of Thermal Conductivity of Heat Transfer Oil-Based MoS2 Nanofluids

MoS2 nanoparticles/MIL-100(Fe) heterojunction with Type II interfacial charge transfer for efficient photocatalytic nitrogen reduction