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685445

Sigma-Aldrich

Halloysite nanoclay

Synonym(s):
Kaolin clay
Linear Formula:
Al2Si2O5(OH)4 · 2 H2O
CAS Number:
Molecular Weight:
294.19
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.23

form

nanopowder

Quality Level

diam. × L

30-70 nm × 1-3 μm , nanotube

color

75-96, Hunter Brightness

refractive index

n20/D 1.54

pore size

1.26-1.34 mL/g pore volume

surface area

64 m2/g

capacity

8.0 meq/g cation exchange capacity

density

2.53 (true specific gravity)

SMILES string

O.O.O[Si](O)(O[Al]=O)O[Si](O)(O)O[Al]=O

InChI

1S/2Al.H4O7Si2.2H2O.2O/c;;1-8(2,3)7-9(4,5)6;;;;/h;;1-2,4-5H;2*1H2;;/q2*+1;-2;;;;

InChI key

HEFIDAICLOZRRO-UHFFFAOYSA-N

General description

Halloysite nanoclay has a tube like morphology. It shows low electrical, thermal conductivity and strong hydrogen interactions, on account of which the inner hydroxyl groups show greater stability than the surface hydroxyl groups in halloysite. The loss of hole water occurs at nearly 300 °C.
Similar to montmorillonite, halloysite consists of two layers of aluminosilicate in 1:1 Al:Si ratio. Significant improvements in thermal, mechanical properties have been reported on addition of halloysite nanotubes in polymer composites.

Application

Halloysite is frequently used as a reinforcement in various nanocomposites, some of which are listed here:
Isotactic propylene-halloysite nanocomposites.
Alloy composites by electroless/ autocatalytic deposition.
Poly(butylene terephthalate) (PBT) composites.
Zinc–halloysite nanotube (HNT) composite coatings.
Halloysite nanotube–hydroxyapatite–hyaluronic acid films.
Halloysite combined with polyamide, polypropylene, poly(ε-caprolactone) and fluroelastomers.
Its tube like morphology, high aspect ratio, and low percolation enables interesting applications as reinforcements in nanocomposites.

Packaging

100, 500 g in poly bottle

Legal Information

Product of Applied Minerals, Inc. Customers may obtain additional technical support and purchase commercial quantities at appliedminerals.com

Storage Class Code

11 - Combustible Solids

WGK

nwg

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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