碳纳米管

Abstract(#br)This study presents a polymer-based carbon-nanotube (CNT) sensing polymer with reversible signal tracking capabilities. The sensing polymer was prepared by dispersing multi-walled CNTs (MWCNTs) and silver nanoparticles into the polydimethylsiloxane (PDMS) polymer matrix. Before curing the PDMS prepolymer, MWCNTs were aligned in the prepolymer, using the dielectrophoresis (DEP) technique. Under an external force, the polymer increased and retained resistivity, which could be recovered to its original value by repeating DEP.

Abstract(#br)A new approach for the fabrication of flexible pressure sensors based on aligned carbon nanotubes (A-CNTs) is described in this paper. The technology is suitable for blood pressure sensors that can be attached to a stent-graft and deployed during an endovascular aneurysm repair (EVAR) procedure. Given the specifications of EVAR, the device should be foldable (extremely flexible) and characterized by a (very small) profile that integrates with the stent-graft cross section.

Abstract(#br)The stretchable conducting films are fabricated by screen-printing method combined with polydimethylsiloxane (PDMS) infiltration. This film is a hybrid composite film formed by embedding carbon nanotubes in a PDMS matrix. The sheet resistance is measured with the tensile strain, and the film maintains electric conductivity at the strain up to 55%. The composite film is used as cathode to measure the field emission properties under varying stretching conditions, which is sensitive to the strain.

Abstract(#br)Polydimethylsiloxane (PDMS) composites with different weight amounts of multi-walled carbon nanotubes (MWCNT) were synthesised as membranes to evaluate their gas separation properties. The selectivity of the membranes was investigated for the separation of H 2 from CH 4 gas species. Membranes with MWCNT concentrations of 1% increased the selectivity to H 2 gas by 94.8%. Furthermore, CH 4 permeation was almost totally blocked through membranes with MWCNT concentrations greater than 5%.

Abstract(#br)This paper describes a new, efficient and versatile method for the sampling and preconcentration of PAH in environmental water matrices using special hybrid magnetic carbon nanotubes. These N-doped amphiphilic CNT can be easily dispersed in any aqueous matrix due to the N containing hydrophilic part and at the same time show high efficiency for the adsorption of different PAH contaminants due to the very hydrophobic surface. After adsorption, the CNT can be easily removed from the medium by a simple magnetic separation.

Abstract(#br)The use of polydimethylsiloxane (PDMS) is increasing with new technologies working toward compact, flexible and transparent devices for use in medical and microfluidic systems. Electronic characterization of PDMS and other insulating materials is difficult due to charging, yet necessary for many applications where the interfacial structure is vital to device function or further modification. The outermost layer in particular is of importance as this is the area where chemical reactions such as surface functionalization will occur.

Abstract(#br)Microbial biofilm formation on composite surfaces has posed potential threats to the composite's structural integrity, durability and physical properties. Pioneer eukaryotes have been reported to be primarily responsible for the degradation of a wide range of composite materials. In this study, different carbon nanotubes (CNTs) were incorporated in the polydimethylsiloxane (PDMS) matrix respectively, in order to create CNTs-filled PDMS composites (PCs) with improved anti-biofouling properties.

Abstract(#br)A carbon nanotube (CNT)-polydimethylsiloxane (PDMS) composite electrode was developed for the capillary electrophoretic determination of the bioactive constituents in Rhizoma Chuanxiong , a traditional Chinese medicine. The novel composite electrode was fabricated on the basis of the in situ polyaddition of curing agent-containing dimethyl siloxane oligomer in the presence of CNTs in the inner bore of a piece of fused silica capillary under heat.

Abstract(#br)Negative permittivity is an exceptional property of metamaterials, which makes them unique class of artificial materials with numerous applications ranging from cloaking to wave filters. In this paper we report about the PDMS (Polydimethylsiloxane)–MWcnt (Multi wall carbon nano tube) composite beyond percolation, as a metamaterial with high negative permittivity. Percolated composite showed high negative permittivity of −2376.62 at 2541.401\u003cce:hsp sp=\"0.25\"/\u003eHz and low tangent loss of −0.065 at 1\u003cce:hsp sp=\"0.25\"/\u003eMHz.

Abstract(#br)In this paper, we develop a new type of polydimethylsiloxane (PDMS)-based nanocomposite by incorporating carboxyl-functionalized multi-walled nanotube (MWCNT) to the polymer matrix as fillers. The dispersion of MWCNT during the material processing plays a significant role in deciding the final properties of the nanocomposites. A rapid evaporation and stirring method was used to minimize re-aggregation of the fillers during MWCNT/PDMS composites fabrication processing by solution blending.