Non-aqueous modification of synthesized hematite nanoparticles with oleic acid

Munawar Khalil; Jianjia Yu; Ning Liu; Robert L. Lee

doi:10.1016/j.colsurfa.2014.03.064

Non-aqueous modification of synthesized hematite nanoparticles with oleic acid

Munawar Khalil, Jianjia Yu, Ning Liu, Robert L. Lee

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

A process for non-aqueous surface modification of synthesized hematite nanoparticles is presented in this paper. Oleic acid was successfully grafted onto a hematite nanoparticle surface in methanol. The FTIR results demonstrated that chemical bonding formed between oleic acid and the hematite surface. Further studies indicated that the binding mechanism between the oleic acid and the hematite surface caused monodentate interaction. The grafted density of oleic acid onto the hematite surface increased linearly at the beginning with oleic acid concentration in the treatment solution and then leveled off at high oleic acid concentration. The saturated grafted density was 2.94mmol/m². As more oleic acid was grafted onto the hematite surface, the hydrophobicity of the hematite nanoparticle changed from hydrophilic to hydrophobic.

Original language	English
Pages (from-to)	7-12
Number of pages	6
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	453
Issue number	1
DOIs	https://doi.org/10.1016/j.colsurfa.2014.03.064
Publication status	Published - 5 Jul 2014

Keywords

FTIR
Hematite
Nanoparticles
Surface property
TEM

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10.1016/j.colsurfa.2014.03.064

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title = "Non-aqueous modification of synthesized hematite nanoparticles with oleic acid",

abstract = "A process for non-aqueous surface modification of synthesized hematite nanoparticles is presented in this paper. Oleic acid was successfully grafted onto a hematite nanoparticle surface in methanol. The FTIR results demonstrated that chemical bonding formed between oleic acid and the hematite surface. Further studies indicated that the binding mechanism between the oleic acid and the hematite surface caused monodentate interaction. The grafted density of oleic acid onto the hematite surface increased linearly at the beginning with oleic acid concentration in the treatment solution and then leveled off at high oleic acid concentration. The saturated grafted density was 2.94mmol/m2. As more oleic acid was grafted onto the hematite surface, the hydrophobicity of the hematite nanoparticle changed from hydrophilic to hydrophobic.",

keywords = "FTIR, Hematite, Nanoparticles, Surface property, TEM",

author = "Munawar Khalil and Jianjia Yu and Ning Liu and Lee, {Robert L.}",

note = "Funding Information: We gratefully acknowledge the support of the Department of Energy through the National Energy Technology Laboratory under contract number DE-FE0005979. The authors appreciate the aid of Liz Bustamante for her assistance in editing this manuscript.",

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T1 - Non-aqueous modification of synthesized hematite nanoparticles with oleic acid

AU - Khalil, Munawar

AU - Yu, Jianjia

AU - Liu, Ning

AU - Lee, Robert L.

N1 - Funding Information: We gratefully acknowledge the support of the Department of Energy through the National Energy Technology Laboratory under contract number DE-FE0005979. The authors appreciate the aid of Liz Bustamante for her assistance in editing this manuscript.

PY - 2014/7/5

Y1 - 2014/7/5

N2 - A process for non-aqueous surface modification of synthesized hematite nanoparticles is presented in this paper. Oleic acid was successfully grafted onto a hematite nanoparticle surface in methanol. The FTIR results demonstrated that chemical bonding formed between oleic acid and the hematite surface. Further studies indicated that the binding mechanism between the oleic acid and the hematite surface caused monodentate interaction. The grafted density of oleic acid onto the hematite surface increased linearly at the beginning with oleic acid concentration in the treatment solution and then leveled off at high oleic acid concentration. The saturated grafted density was 2.94mmol/m2. As more oleic acid was grafted onto the hematite surface, the hydrophobicity of the hematite nanoparticle changed from hydrophilic to hydrophobic.

AB - A process for non-aqueous surface modification of synthesized hematite nanoparticles is presented in this paper. Oleic acid was successfully grafted onto a hematite nanoparticle surface in methanol. The FTIR results demonstrated that chemical bonding formed between oleic acid and the hematite surface. Further studies indicated that the binding mechanism between the oleic acid and the hematite surface caused monodentate interaction. The grafted density of oleic acid onto the hematite surface increased linearly at the beginning with oleic acid concentration in the treatment solution and then leveled off at high oleic acid concentration. The saturated grafted density was 2.94mmol/m2. As more oleic acid was grafted onto the hematite surface, the hydrophobicity of the hematite nanoparticle changed from hydrophilic to hydrophobic.

KW - FTIR

KW - Hematite

KW - Nanoparticles

KW - Surface property

KW - TEM

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Non-aqueous modification of synthesized hematite nanoparticles with oleic acid

Abstract

Keywords

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