Enhancing dispersion of halloysite nanotubes via chemical modification

Lun, Huilin; Ouyang, Jing; Yang, Huaming

doi:10.1007/s00269-013-0646-9

Cited by 65 publications

(33 citation statements)

References 39 publications

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“…Halloysite surface charge is negative and rather stable at different pH, while the interior surface is positively charged [19,50]. Halloysie isoelectric point (pI) was found to be 3.8 [51], while the pI of DNA is about 5, and that of RNA is 2-2.5 [13]. Thus, all interacting components are negatively charged at pH above 5 used in our binding experiments, and direct electrostatic interaction between them is impossible.…”

Section: Discussionmentioning

confidence: 86%

Facile Fabrication of Natural Polyelectrolyte-Nanoclay Composites: Halloysite Nanotubes, Nucleotides and DNA Study

et al. 2020

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Complexation of biopolymers with halloysite nanotubes (HNTs) can greatly affect their applicability as materials building blocks. Here we have performed a systematic investigation of fabrication of halloysite nanotubes complexes with nucleotides and genomic DNA. The binding of DNA and various nucleotide species (polyAU, UMP Na2, ADP Na3, dATP Na, AMP, uridine, ATP Mg) by halloysite nanotubes was tested using UV-spectroscopy. The study revealed that binding of different nucleotides to the nanoclay varied but was low both in the presence and absence of MgCl2, while MgCl2 facilitated significantly the binding of longer molecules such as DNA and polyAU. Modification of the nanotubes with DNA and nucleotide species was further confirmed by measurements of ζ-potentials. DNA-Mg-modified nanotubes were characterized using transmission electron (TEM), atomic force (AFM) and hyperspectral microscopies. Thermogravimetric analysis corroborated the sorption of DNA by the nanotubes, and the presence of DNA on the nanotube surface was indicated by changes in the surface adhesion force measured by AFM. DNA bound by halloysite in the presence of MgCl2 could be partially released after addition of phosphate buffered saline. DNA binding and release from halloysite nanotubes was tested in the range of MgCl2 concentrations (10–100 mM). Even low MgCl2 concentrations significantly increased DNA sorption to halloysite, and the binding was leveled off at about 60 mM. DNA-Mg-modified halloysite nanotubes were used for obtaining a regular pattern on a glass surface by evaporation induced self-assembly process. The obtained spiral-like pattern was highly stable and resisted dissolution after water addition. Our results encompassing modification of non-toxic clay nanotubes with a natural polyanion DNA will find applications for construction of gene delivery vehicles and for halloysite self-assembly on various surfaces (such as skin or hair).

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Section: Discussionmentioning

confidence: 86%

Facile Fabrication of Natural Polyelectrolyte-Nanoclay Composites: Halloysite Nanotubes, Nucleotides and DNA Study

et al. 2020

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“…Lun et al [62] reported a method where sodium dodecyl sulfate (SDS) was used to prepare uniform and stable halloysite nanotubes dispersions. The ζ-potential values of an HNTs/SDS system became more negative than those of the neat clay, indicating that SDS is adsorbed on the inner surface, enhancing the dispersibility by electrostatic effect.…”

Section: Colloidal Stability In Organic Mediamentioning

confidence: 99%

Stability of Halloysite, Imogolite, and Boron Nitride Nanotubes in Solvent Media

et al. 2018

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Featured Application: The review is focused on the stabilization of nanotubular materials in solvent media. This aspect is a key starting point for any application of nanotube-based formulations for pharmaceutical and industrial applications.Abstract: Inorganic nanotubes are attracting the interest of many scientists and researchers, due to their excellent application potential in different fields. Among them, halloysite and imogolite, two naturally-occurring aluminosilicate mineral clays, as well as boron nitride nanotubes have gained attention for their proper shapes and features. Above all, it is important to reach highly stable dispersion in water or organic media, in order to exploit the features of this kind of nanoparticles and to expand their applications. This review is focused on the structural and morphological features, performances, and ratios of inorganic nanotubes, considering the main strategies to prepare homogeneous colloidal suspensions in various solvent media as special focus and crucial point for their uses as nanomaterials.

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“…The conditions would not be strongly acidic or basic for that the excessive acid or base would abolish the structure of halloysite nanotubes 90 . The particle size distribution was measured by laser particle size analyzer (LS-POP6) 91 . Cavallaro et al prepared surfactant modified halloysite nanotubes.…”

Section: Halloysite Nanotubes Modification With Sodium Dodecyl Sulfatementioning

confidence: 99%

Properties and Modification Methods of Halloysite Nanotubes: A State-of-the-Art Review

Saif

Asif

Naveed

2018

J. Chil. Chem. Soc.

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The halloysite nanotubes (HNTs) are naturally found in New Zealand, China, Brazil, America, and France. Halloysite nanotubes have unique physical, chemical, and electrochemical properties. Due to their non-hazardous nature and easy availability, they are used in various fields of science. To improve halloysite nanotubes' interactions, these can be functionalized by different modification methods like covalent functionalization, non-covalent functionalization, etc. The chemical formula of halloysite nanotubes is Al 2 Si 2 O 5 (OH) 4 .2H 2 O. HNTs have a nanotubular geometry which exhibit its dimensions on nanoscale. This nanotubular array of HNTs varies with different regions. In this review, we have tried to reiterate the key properties and various methods to modify halloysite nanotubes.

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Enhancing dispersion of halloysite nanotubes via chemical modification

Cited by 65 publications

References 39 publications

Facile Fabrication of Natural Polyelectrolyte-Nanoclay Composites: Halloysite Nanotubes, Nucleotides and DNA Study

Facile Fabrication of Natural Polyelectrolyte-Nanoclay Composites: Halloysite Nanotubes, Nucleotides and DNA Study

Stability of Halloysite, Imogolite, and Boron Nitride Nanotubes in Solvent Media

Properties and Modification Methods of Halloysite Nanotubes: A State-of-the-Art Review

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