Novel polyamide nanocomposites based on silicate nanotubes of the mineral halloysite

Hedicke-Höchstötter, Katrin; Lim, G. T.; Altstädt, Volker

doi:10.1016/j.compscitech.2008.10.011

Cited by 139 publications

(91 citation statements)

References 23 publications

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“…It exhibits interesting features and offers potential application as entrapment of hydrophilic and lipophilic active agents, as enzymatic nanoscale reactor (Shchukin et al, 2005); as sustained release of drugs (Price et al, 2001;Levis & Deasy, 2003;Kelly et al, 2004;Veerabadran et al, 2007); as adsorbing agent for dye removal (Liu et al, 2011). It can be employed to improve mechanical performance of cements and polymers (Hedicke-Höchstötter et al, 2009). …”

Section: Wwwintechopencommentioning

confidence: 99%

Clay Mineral Nanotubes: Stability, Structure and Properties

Duarte¹,

Lourenço²,

Heine³

et al. 2012

Stoichiometry and Materials Science - When Numbers Matter

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Section: Wwwintechopencommentioning

confidence: 99%

Clay Mineral Nanotubes: Stability, Structure and Properties

Duarte¹,

Lourenço²,

Heine³

et al. 2012

Stoichiometry and Materials Science - When Numbers Matter

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“…HNTs have been widely used as a nanostructured reinforcement material for polymers that exhibit low mechanical strengths [7,8]. Modification of these nanotubes through surface coatings and other preparations can further enhance the strength and dispersion of the HNTs within the polymer [9,10]. HNTs also enable the sustained release of loaded chemicals, drugs, and growth factors [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively [5,6]. HNTs are capable of enhancing the material properties of many polymer matrices [7][8][9][10]. HNTs have been widely used as a nanostructured reinforcement material for polymers that exhibit low mechanical strengths [7,8].…”

Section: Introductionmentioning

confidence: 99%

Dry Sintered Metal Coating of Halloysite Nanotubes

et al. 2016

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Abstract:Halloysite nanotubes (HNTs) are a naturally-occurring aluminosilicate whose dimensions measure microns in length and tens of nanometers in diameter. Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively. HNTs have been shown to enhance the material properties of polymer matrices and enable the sustained release of loaded chemicals, drugs, and growth factors. Due to the net charges, these nanotubes can also be readily coated in layered-depositions using the HNT exterior lumen's net negative charge as the basis for assembly. These coatings are primarily done through wet chemical processes, the majority of which are limited in their use of desired chemicals, due to the polarity of the halloysite. Furthermore, this restriction in the type of chemicals used often requires the use of more toxic chemicals in place of greener options, and typically necessitates the use of a significantly longer chemical process to achieve the desired coating. In this study, we show that HNTs can be coated with metal acetylacetonates-compounds primarily employed in the synthesis of nanoparticles, as metal catalysts, and as NMR shift reagents-through a dry sintering process. This method was capable of thermally decaying the metal acetylacetonate, resulting in a free positively-charged metal ion that readily bonded to the negatively-charged HNT exterior, resulting in metallic coatings forming on the HNT surface. Our coating method may enable greater deposition of coated material onto these nanotubes as required for a desired application. Furthermore, the use of chemical processes using toxic chemicals is not required, thus eliminating exposure to toxic chemicals and costs associated with the disposal of the resultant chemical waste.

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“…These sizes vary in different halloysite deposits [28]. The nano-sized tubular structure and the mesoporosity (or even macroporosity) of halloysite make it suitable for use as a nanoscale reactor for biomineralization [28], an adsorbent for pollutant [29], an additive for polymer nanocomposites [30], and a carrier for the controlled release of protective agents [31]. In particular, the lumen size of halloysite is greater than 10 nm, which is sufficiently large to accommodate various guests.…”

Section: Introductionmentioning

confidence: 99%