Properties and applications of halloysite nanotubes: recent research advances and future prospects

Yuan, Peng; Tan, Daoyong; Annabi-Bergaya, Faïza

doi:10.1016/j.clay.2015.05.001

Cited by 817 publications

(392 citation statements)

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“…Throughout the process of sample preparation, sodium dodecyl sulfate (SDS) is used as a good dispersing agent for HNTs in aqueous solution [15,16]. The chemical structure of HNTs shows that the external surface contains siloxane (Si-O-Si) groups, aluminol (Al-OH), and silanol (Si-OH) groups [17,18]. The effect of the biopolymer charge on nanocomposite materials was thoroughly discussed in [19].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

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Surface Improvement of Halloysite Nanotubes

et al. 2017

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A novel development on halloysite-polyvinyl alcohol (HNTs-PVA) nanocomposites has been conducted using malonic acid (MA) by crosslinking PVA and HNTs. PVA-MA crosslinking produces smooth surfaces, which play an important role in enhancing the properties of HNTs-PVA nanocomposite. The crystallographic structures of crosslinked HNTs-PVA show almost no change as depicted by the X-ray diffraction (XRD)-2θ-peak, suggesting that MA has no or little influence on the crystallographic structure of the HNTs-PVA. Images taken by field emission scanning electron microscope (FESEM) suggest possible effects of MA on the morphology and internal features of HNTs-PVA by reducing the agglomeration of HNTs, which is considered a decisive step in improving the surface qualities of HNTs. Investigating the samples using the Brunauer-Emmelt-Teller (BET) technique showed that the surface area was increased by about 10 times, reaching the second highest recorded results compared to the HNTs, which could be considered a breakthrough step in enhancing the properties of HNTs-PVA due to MA crosslinking.

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…The chemical structure of HNTs shows that the external surface contains siloxane (Si-O-Si) groups, aluminol (Al-OH), and silanol (Si-OH) groups [17,18]. The effect of the biopolymer charge on nanocomposite materials was thoroughly discussed in [19].…”

Section: Introductionmentioning

confidence: 99%

Surface Improvement of Halloysite Nanotubes

et al. 2017

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“…Based on the recent studies, the base treatment can cause changes in structure, texture, and morphology of clay minerals. These changes are related to partial dissolution of layered structure and subsequent release of Si and Al to the solution (White et al 2012, Yuan et al 2015. This modification can be especially promising in case of halloysite, which is a clay mineral revealing unique nanoscale tubular morphology.…”

mentioning

confidence: 99%

The influence of alkali concentration and temperature on chemical activation of halloysite [abstract].

Maziarz¹,

Matusik²

2016

geol

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CC-BY 4.0 License requiring that the original work has been properly cited.The suspensions consisting of 2 g of halloysite and 50 mL of appropriate solution were mixed for 24 h using magnetic stirrer. Subsequently, the samples were washed with water and dried at 60°C. The prepared materials were characterized using XRD and FTIR methods.The IR results revealed that the concentrations of NaOH below 5 mol/L at room temperature did not cause significant changes in spectra of the tested samples. However, the results of experiments carried out in the temperature range from 60°C to 90°C showed that the temperature of the suspension can significantly affect the alkali activation. Based on the IR spectra the reaction at 50°C did not alter the structure of halloysite, in contrast to 60°C, 70°C, 80°C and 90°C temperatures. The changes of relative intensities of the bands associated with inner surface hydroxyls were observed in the 3700-3600 cm −1 region. These results suggest a gradual removal of inner surface hydroxyls, with the temperature increase. The results also indicated a gradual increase of intensity and broadening of the band with the maximum at 3430 cm −1 and 1647 cm −1 which were attributed to H-O-H stretching and bending vibrations of adsorbed water, respectively. It can be also observed that base treatment at higher temperature also caused structural changes within the aluminosilicate framework of halloysite. The frequency shift and broadening of bands assigned to Si-O-Si stretching (1033 cm −1 , 1008 cm −1 ) and bending (540 cm −1 ) vibrations were observed. The perturbations and/or removal of Al-O-H was confirmed by the decrease of bands intensity assigned to The influence of alkali activation on clay minerals is not thoroughly investigated, particularly in terms of its impact on adsorption possibilities of clay minerals. One of the studied applications of base treated clay minerals was to control sustained drug release (Wang et al. 2013). Based on the recent studies, the base treatment can cause changes in structure, texture, and morphology of clay minerals. These changes are related to partial dissolution of layered structure and subsequent release of Si and Al to the solution (White et al. 2012, Yuan et al. 2015. This modification can be especially promising in case of halloysite, which is a clay mineral revealing unique nanoscale tubular morphology. Previous studies indicate that selective dissolution of halloysite's aluminosilicate layers can lead to opening of the tubes interior (lumen) (Wang et al. 2013). This type of structural alteration can influence utilization possibilities of halloysite. Therefore, the aim of this work is to investigate the influence of alkali concentration and reaction temperature on the halloysite structure.The halloysite used in the studies came from Polish deposit located in Dunino, near Legnica (SW Poland) which is constantly exploited. The base activation was carried out using sodium hydroxide (NaOH). Firstly, the effect of NaOH concentration on activation efficiency was ...

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“…The attractiveness of the infiltrated composites prompted the authors to attempt to develop light metal matrix composites reinforced by porous ceramic preforms manufactured on the base of halloysite nanotubes. HNTs were obtained from hydrogenated aluminium silicate Al 2 Si 2 O 5 (OH) 4 ·H 2 O, clay mineral from kaolin group minerals, characterised by low density, high porosity, chemical and thermal stability, the ability to absorb gases, as well as biological compatibility [11]. A review of literature shows that the halloysite nanotubes are widely used in the ceramic industry, in environmental protection as sorbents, coagulants for water treatment, waste immobilizers, as well as in biomedicine as drug carriers, and in the cosmetic industry [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…HNTs were obtained from hydrogenated aluminium silicate Al 2 Si 2 O 5 (OH) 4 ·H 2 O, clay mineral from kaolin group minerals, characterised by low density, high porosity, chemical and thermal stability, the ability to absorb gases, as well as biological compatibility [11]. A review of literature shows that the halloysite nanotubes are widely used in the ceramic industry, in environmental protection as sorbents, coagulants for water treatment, waste immobilizers, as well as in biomedicine as drug carriers, and in the cosmetic industry [11][12][13]. Halloysite nanotubes have lately become the subject of research consideration as a new type of reinforcement for improving the mechanical, thermal and fire-retardant properties of aluminium matrix composites [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of Porous Ceramic Preforms Based on Halloysite Nanotubes (Hnts)

Kujawa

Dobrzański

Matula

et al. 2016

Archives of Metallurgy and Materials

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The aim of this study was to determine the influence of manufacturing conditions on the structure and properties of porous halloysite preforms, which during pressure infiltration were soaked with a liquid alloy to obtain a metal matrix composite reinforced by ceramic, and also to find innovative possibilities for the application of mineral nanotubes obtained from halloysite. The method of manufacturing porous ceramic preforms (based on halloysite nanotubes) as semi-finished products that are applicable to modern infiltrated metal matrix composites was shown. The ceramic preforms were manufactured by sintering of halloysite nanotubes (HNT), Natural Nano Company (USA), with the addition of pores and canals forming agent in the form of carbon fibres (Sigrafil C10 M250 UNS SGL Group, the Carbon Company). The resulting porous ceramic skeletons, suggest innovative application capabilities mineral nanotubes obtained from halloysite.

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Properties and applications of halloysite nanotubes: recent research advances and future prospects

Cited by 817 publications

References 168 publications

Surface Improvement of Halloysite Nanotubes

Surface Improvement of Halloysite Nanotubes

The influence of alkali concentration and temperature on chemical activation of halloysite [abstract].

Manufacturing of Porous Ceramic Preforms Based on Halloysite Nanotubes (Hnts)

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