Halloysite in Different Ceramic Products: A Review

Lampropoulou, Paraskevi; Papoulis, Dimitrios

doi:10.3390/ma14195501

Cited by 19 publications

(11 citation statements)

References 80 publications

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“…Compared to other tubular nanomaterials, HNTs show some advantages in terms of processability and hydrodynamic properties [ 10 ]. In fact, for many years, much attention was focused on carbon nanotubes (CNTs) [ 11 , 12 , 13 , 14 ], showing that these nanotubes have a high cost, lower water dispersibility, and higher toxicity than HNTs [ 15 ]. The physicochemical properties of HNTs were fully described, disclosing their potential for various applications such as biomedicine and catalysis [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials: A Review about Halloysite Nanotubes, Properties, and Application in the Biological Field

Biddeci

Colomba

Blasi

2022

IJMS

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The use of synthetic materials and the attention towards environmental hazards and toxicity impose the development of green composites with natural origins. Clay is one of the candidates for this approach. Halloysite is a natural clay mineral, a member of the Kaolin group, with characteristic tubular morphology, usually named halloysite nanotubes (HNTs). The different surface chemistry of halloysite allows the selective modification of both the external surface and the inner lumen by supramolecular or covalent interactions. An interesting aspect of HNTs is related to the possibility of introducing different species that can be released more slowly compared to the pristine compound. Due to their unique hollow morphology and large cavity, HNTs can be employed as an optimal natural nanocarrier. This review discusses the structure, properties, and application of HNTs in the biological field, highlighting their high biocompatibility, and analyse the opportunity to use new HNT hybrids as drug carriers and delivery systems.

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Section: Introductionmentioning

confidence: 99%

Nanomaterials: A Review about Halloysite Nanotubes, Properties, and Application in the Biological Field

Biddeci

Colomba

Blasi

2022

IJMS

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“…We developed the Ouali model by consid- Recently, ceramic nanoparticles have attracted much interest in the academic research community [23][24][25][26][27][28][29][30][31][32]. Alumino-silicate and nanotubular HNT, for example, have the composition of Al 2 (OH) 4 Si 2 O 5 (2H 2 O) and few hydroxyl groups on their surface [30,[33][34][35][36][37]. They normally have a single-tube construct, which can be dispersed in any solvent medium because of siloxane and their few hydroxyl groups, which simplifies the distribution and development of hydrogen bonding [38].…”

Section: Introductionmentioning

confidence: 99%

Tensile Modulus of Polymer Halloysite Nanotube Systems Containing Filler–Interphase Networks for Biomedical Requests

2022

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To date, there have been a limited number of studies modeling the tensile modulus in the polymer halloysite nanotube (HNT) systems before or after percolation onset. In this paper, an equation for a composite’s modulus post-percolation onset was developed for HNT-filled samples including the interphase and HNT network. The dispersed nanoparticles and adjoining interphase part were neglected, because they caused ineffective influences on the stiffness of the system after percolation onset. The developed model reflects the impacts of HNTs’ size, interphase depth, percolation onset and the volume shares and moduli of the HNT network and its adjacent interphase on the modulus of HNT-based systems. The impacts of issues on the nanocomposite modulus are defendable, confirming the effectiveness of the developed model. HNT length, interphase depth, HNT concentration, net modulus and net portion directly influenced the stiffness, while the HNT radius and percolation onset had inverse effects. Results show that there was a 142% improvement in the modulus of samples at an interphase depth of 40 nm. Moreover, the stiffness improved by 60% at a net modulus of 200 GPa, but it later exhibited a 180% enhancement at a net modulus of 1000 GPa. In addition, the experimental data for the modulus of numerous composites display fine agreement to the predictions, confirming the validity of the developed model.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Tubular halloysite nanotubes (HNTs) are novel nanofillers with a small contact zone, which eases their distribution in polymer matrices. [14][15][16][17][18][19][20][21] They are less expensive than wellknown nanoparticles, such as CNTs and graphene. In addition, they are more hydrophobic than nanoclays, which allow them to be dispersed simply in matrices.…”

Section: Introductionmentioning

confidence: 99%

Progression of Ouali model by the strengthening and percolating efficacies of interphase for polymer halloysite nanotubes composites applicable in the biomedical products

Zare

Rhee

2022

Polymer Composites

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The Ouali model is used to approximate the tensile strength of a halloysite nanotube (HNT) system after the start of percolation. The proposed model reflects the interphase and its roles in the percolation start and strengthening of samples. The outputs of the proposed model are matched to tested data, and the impressions of all parameters on the strength of the samples are evaluated. Experimentally measured results of numerous examples as well as parametricstudies validate the established model. The strength of the nanocomposite is directly associated with the depth (t) and strength (σ i ) of the interphase section. At t = 5 nm, the strength of the system improves by 6%, whereas at t = 40 nm, the strength of the nanocomposite increases by 46%. At σ i = 50 MPa, the strength of the samples increases by 5%, whereas at σ i = 400 MPa, it increases by 35%. Furthermore, the results show an inverse correlation between the strength of the system and the HNT radius. The HNT concentration directly affects the strength, and at an HNT volume portion of 0.04, the strength of the nanocomposite increases significantly by 78%. Nonetheless, the percolation start and HNT length do not significantly affect the strength of the nanocomposites. The present samples can be applied in the biomedical fields, due to their excellent properties.

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Halloysite in Different Ceramic Products: A Review

Cited by 19 publications

References 80 publications

Nanomaterials: A Review about Halloysite Nanotubes, Properties, and Application in the Biological Field

Nanomaterials: A Review about Halloysite Nanotubes, Properties, and Application in the Biological Field

Tensile Modulus of Polymer Halloysite Nanotube Systems Containing Filler–Interphase Networks for Biomedical Requests

Progression of Ouali model by the strengthening and percolating efficacies of interphase for polymer halloysite nanotubes composites applicable in the biomedical products

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