Dependence of the mechanical properties of nanohoneycomb structures on porosity

Abstract

Mechanical properties of nanohoneycomb structures are measured for varying porosity (or pore diameter) of the nanohoneycomb structure. The indentation modulus and hardness in the pore direction (or thickness direction) are obtained from indentation tests using a nano-indenter. The bending modulus of the nanohoneycomb structures in the vertical direction relative to the pore (generally along the beam length) is determined from bending tests in AFM. To determine the bending modulus of the nanohoneycomb structures, the area moment of inertia of the nanohoneycomb structure is determined according to the arrangement of the pores. The indentation moduli and the hardness are found to decrease nonlinearly with increasing porosity. The bending moduli of the nanohoneycomb structures also decrease nonlinearly as a function of porosity over a large range. It is made clear that the elastic modulus of a homogenous material can be controlled by changing the pore diameter.

Microcantilevers with nanowells as moisture sensors

“…Both the cantilever deflections increase linearly with the moisture concentration. The changes in surface stress ( ) due to moisture adsorption onto the porous AAO cantilever can be obtained with the modified Stoney's equation [18,23]:…”

Direct coupling of a carbon nanotube membrane to a mass spectrometer: Contrasting nanotube and capillary tube introduction systems

“…The AAO membrane has remarkable strength properties [18], and AAO membrane strength can be improved by controlling pore-cell dimension and crystalline structure through calcination [17,19]. In addition, support by a stainless steel frit in the membrane module reduced stress on the membrane and increased membrane tolerance to high pressure differentials between the sample and the mass spectrometer vacuum.…”

Controlled transparency and wettability of large-area nanoporous anodized alumina on glass

“…Since NAAs intrinsically have a hydrophilic character, heptadecafluoro-1,1,2,2-tetrahydrodecyl trichlorosilane (HDFS) is utilized as a self-assembled monolayer to create hydrophobicity. Consequently, we demonstrate a transparent superhydrophobic surface on the glass wafer.NAA is a tunable nanostructure by simply controlling its anodizing and widening time [12,18]. Furthermore, it can be easily fabricated on any large substrate by http://dx.…”

“…NAA is a tunable nanostructure by simply controlling its anodizing and widening time [12,18]. Furthermore, it can be easily fabricated on any large substrate by http://dx.…”

“…NAA is a tunable nanostructure by simply controlling its anodizing and widening time [12,18] depositing an aluminum (Al) layer and then by anodizing. We thus prepared a wafer-scale piece of glass and deposited a 200 nm-thick Al layer via e-beam evaporation, as shown in Figure 1a(i) and (ii).…”