Выдержка
Wet methods for nanoparticle characterization need to use the surfactants to prevent the agglomeration of particles in hydrosols. In this work, we investigated the effect of pH on the agglomeration state and the stability of differently sized Fe2O3 nanoparticles, notably 35 and 120 nm in average, in amino acid solutions as glycine, l-lysine and l-glutamine, using the method of dynamic light scattering. The lowest electrokinetic stability and maximum agglomeration of both hydrosols was found in the acidic medium, particularly, at pH = 3.5 for Fe2O3-35 and pH = 6.5 for Fe2O3-120 (surface isoelectric point). At pH ≤ 7 in amino acid–based solutions, the charge direction was depended on the particles size. The pH growth from 5 to 9 suppressed Fe2O3 particle agglomeration although the effect of pH was much higher in glycine (neutral amino acid) where the agglomerates’ size decreased by 4.5 times compared with 2.8 in glutamine (acidic amino acid) and 1.8 in lysine (basic amino acid). It was concluded that the pH predominantly affected an agglomeration with respect to the particle size and acidity of amino acids. In alkali medium at pH = 9, particles had a maximum charge and minimum size in all solutions. For example, in glycine, the average size/zeta potential of Fe2O3-35 and Fe2O3-120 agglomerates were, respectively, 180 ± 20 nm/− 32 mV and 263 ± 80 nm/− 38 mV compared with water 510 ± 20 nm/− 18 mV and 180 ± 69 nm/− 24 mV.
| Язык оригинала | Английский |
|---|---|
| Номер статьи | 208 |
| Журнал | Journal of Nanoparticle Research |
| Том | 21 |
| Номер выпуска | 10 |
| DOI | |
| Состояние | Опубликовано - 1 окт 2019 |
Отпечаток
ASJC Scopus subject areas
- Bioengineering
- Chemistry(all)
- Atomic and Molecular Physics, and Optics
- Modelling and Simulation
- Materials Science(all)
- Condensed Matter Physics
Цитировать
Agglomeration of iron oxide nanoparticles : pH effect is stronger than amino acid acidity. / Godymchuk, Anna; Papina, Iuliia; Karepina, Elizaveta; Kuznetsov, Denis; Lapin, Ivan; Svetlichnyi, Valery.
В: Journal of Nanoparticle Research, Том 21, № 10, 208, 01.10.2019.Результат исследований: Материалы для журнала › Статья
}
TY - JOUR
T1 - Agglomeration of iron oxide nanoparticles
T2 - pH effect is stronger than amino acid acidity
AU - Godymchuk, Anna
AU - Papina, Iuliia
AU - Karepina, Elizaveta
AU - Kuznetsov, Denis
AU - Lapin, Ivan
AU - Svetlichnyi, Valery
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Wet methods for nanoparticle characterization need to use the surfactants to prevent the agglomeration of particles in hydrosols. In this work, we investigated the effect of pH on the agglomeration state and the stability of differently sized Fe2O3 nanoparticles, notably 35 and 120 nm in average, in amino acid solutions as glycine, l-lysine and l-glutamine, using the method of dynamic light scattering. The lowest electrokinetic stability and maximum agglomeration of both hydrosols was found in the acidic medium, particularly, at pH = 3.5 for Fe2O3-35 and pH = 6.5 for Fe2O3-120 (surface isoelectric point). At pH ≤ 7 in amino acid–based solutions, the charge direction was depended on the particles size. The pH growth from 5 to 9 suppressed Fe2O3 particle agglomeration although the effect of pH was much higher in glycine (neutral amino acid) where the agglomerates’ size decreased by 4.5 times compared with 2.8 in glutamine (acidic amino acid) and 1.8 in lysine (basic amino acid). It was concluded that the pH predominantly affected an agglomeration with respect to the particle size and acidity of amino acids. In alkali medium at pH = 9, particles had a maximum charge and minimum size in all solutions. For example, in glycine, the average size/zeta potential of Fe2O3-35 and Fe2O3-120 agglomerates were, respectively, 180 ± 20 nm/− 32 mV and 263 ± 80 nm/− 38 mV compared with water 510 ± 20 nm/− 18 mV and 180 ± 69 nm/− 24 mV.
AB - Wet methods for nanoparticle characterization need to use the surfactants to prevent the agglomeration of particles in hydrosols. In this work, we investigated the effect of pH on the agglomeration state and the stability of differently sized Fe2O3 nanoparticles, notably 35 and 120 nm in average, in amino acid solutions as glycine, l-lysine and l-glutamine, using the method of dynamic light scattering. The lowest electrokinetic stability and maximum agglomeration of both hydrosols was found in the acidic medium, particularly, at pH = 3.5 for Fe2O3-35 and pH = 6.5 for Fe2O3-120 (surface isoelectric point). At pH ≤ 7 in amino acid–based solutions, the charge direction was depended on the particles size. The pH growth from 5 to 9 suppressed Fe2O3 particle agglomeration although the effect of pH was much higher in glycine (neutral amino acid) where the agglomerates’ size decreased by 4.5 times compared with 2.8 in glutamine (acidic amino acid) and 1.8 in lysine (basic amino acid). It was concluded that the pH predominantly affected an agglomeration with respect to the particle size and acidity of amino acids. In alkali medium at pH = 9, particles had a maximum charge and minimum size in all solutions. For example, in glycine, the average size/zeta potential of Fe2O3-35 and Fe2O3-120 agglomerates were, respectively, 180 ± 20 nm/− 32 mV and 263 ± 80 nm/− 38 mV compared with water 510 ± 20 nm/− 18 mV and 180 ± 69 nm/− 24 mV.
KW - Agglomeration
KW - Amino acid
KW - Average size
KW - Dynamic light scattering
KW - Glutamic acid
KW - Glycine
KW - Hematite
KW - Hydrosol
KW - Iron oxide (III)
KW - Lysine
KW - Nanoparticles
KW - pH
KW - Zeta potential
UR - http://www.scopus.com/inward/record.url?scp=85073194784&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073194784&partnerID=8YFLogxK
U2 - 10.1007/s11051-019-4634-y
DO - 10.1007/s11051-019-4634-y
M3 - Article
AN - SCOPUS:85073194784
VL - 21
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
SN - 1388-0764
IS - 10
M1 - 208
ER -