The effects of silane coupling agents on the properties of PHBV/halloysite nanocomposites

Nanoporous-walled silica and alumina nanotubes derived from halloysite: controllable preparation and their dye adsorption applications

“…In the past decade, there are many halloysite-related works, such as halloysite-based adsorbents (Viseras et al, 2008;Zhao and Liu, 2008;Kiani et al, 2011;Kadi et al, 2012;Kiani, 2014), catalysts (Barrientos-Ramirez et al, 2009;, advanced ceramics (Fu and Zhang, 2005), polymer nanocomposites Pasbakhsh et al, 2013;Carli et al, 2014;Sarifuddin et al, 2014;Yang et al, 2014), hard template (Zhou et al, 2011), and drug loading and releasing (Tan et al, 2014). Nonetheless, the halloysite nanotubes (abbreviated as Hal hereafter) feature a solid tube wall of tens of nanometers in thickness, which restricts the Hal with a confined specific surface area S BET of around 50 m 2 /g .…”

Mechanical and moisture barrier properties of titanium dioxide nanoparticles and halloysite nanotubes reinforced polylactic acid (PLA)

“…HNT has two different interlayer surfaces. The external surface is predominantly covered by siloxane (Si-O-Si) groups and some silanol (Si-OH) and aluminol (Al-OH) groups that are exposed at the edges of the tube, whereas aluminol groups are located in the internal surface 5 . HNTs have been widely used during recent years to reinforcing the polymer matrices such as epoxy resins 6 polypropylene, polyamide, polyvinyl alcohol and styrene rubber.…”

“…For many 2 To whom any correspondence should be addressed. 4,5 . HNT has two different interlayer surfaces.…”

Organosilane-functionalized halloysite for high performance halloysite/heterophasic ethylene–propylene copolymer nanocomposites

“…Organosilane modified Hal (m-Hal) were prepared with Hal:silane ratios of 5:1 and 2.5:1 (w/v), comparing two different methods (Yuan et al, 2008;Carli et al, 2014). In the Carli method, approximately 20 g of Hal was dispersed in 96 v.-% ethanol (120 mL) and vigorously stirred.…”

“…Hal, having the molecular formula of Al 2 Si 2 O 5 (OH) 4 ·nH 2 O, are naturally occurring multi-walled inorganic nanotubes with high aspect ratio (Carli et al, 2014), showing a similar geometry to that of carbon nanotubes (Wang and Huang, 2013) The Hal dimensions depend on the deposits, showing lengths in the range of 1-15 μm; inner diameters of 10-30 nm and outer diameter of 50-70 nm (Ranganatha et al, 2012). In contrast to most other clays minerals, the majority of the aluminols are located in the interior (lumen space) of the Hal, while the outer surface of the Hal is primary siloxanes, and few silanols/aluminols are exposed at the defects and edges of the layers .…”