Simultaneously increasing the hydrophobicity and interfacial adhesion of carbon fibres: a simple pathway to install passive functionality into composites

Abstract

Hydrophobic carbon fibres were developed and show improved interfacial adhesion.

Using In Situ Polymerization to Increase Puncture Resistance and Induce Reversible Formability in Silk Membranes

“…Interestingly, the use of 4-nitrobenzenediazonium tetrafluoroborate (Figure 3) as the initiator showed an almost identical WCA (87.6 • , Figure 4) to the control. In this instance, similar WCA values from the presence of nitrophenyl groups at the surface of a material were observed by our group previously [34]. This is likely assisted by the diazonium salt reacting extensively via the direct attack pathway (Figure 2, in red).…”

“…Nevertheless, carrying out this process with the remaining aryldiazonium salts (Figure 3) gave promising results. The polymerization mediated by 3-(trifluoromethyl)benzenediazonium salt 7 gave a very sharp decrease in WCA (43.5°, Figure 3), while the membranes modified using the 4-cyano and 4-ethynylbenzene diazonium salts 5 and 8, In this instance, similar WCA values from the presence of nitrophenyl groups at the surface of a material were observed by our group previously [34]. This is likely assisted by the diazonium salt reacting extensively via the direct attack pathway (Figure 2, in red).…”

Surface modification strategy for fluorescence solvatochromism of carbon dots prepared from p-phenylenediamine

“…For PFDA-CDs, the C-F peak assigned to the perfluoroalkyl group, CF 2 and CF 3 , was observed at 290.9 and 293.0 eV, respectively, in the C 1s spectrum and at 688.1 eV in the F 1s spectrum. 29,30 This result reveals that the CD surface was successfully modified with PFDA to form PFDA-CDs. The C 1s spectrum of CDs was composed of C-C/CQC (284.4 eV) and C-N (285.3 eV) peaks, 18,31 whereas the C 1s spectra of DA-CDs and PFDA-CDs contained OQC-N-H peaks due to amide bonds (287.1-287.8 eV) 32 in addition to C-C/C QC and C-N peaks.…”

Simultaneous Photografting of Two Organic Groups on a Gold Surface by using Arylazo Sulfones as Single Precursors

“…The corresponding aryl radical is obtained from N 2 loss of the diazenyl radical (path c). 33 Trapping by the gold surface of the diazenyl radical/ methanesulfonyl radical pair allowed the formation of the mixed functionalized surface (path d, Scheme 2). The presence of the aryl groups in the film and on the surface, has been well documented during of diazonium salts and the IRRAS spectra of surfaces grafted by arylazo sulfones indicate the presence of these groups.…”

“…32 Mixed layers of aminophenyl and perfluoroalkyl groups electrografted on carbon fibers (obtained from aryldiazonium salt and perfluoroalkyliodide) permit to obtained hydrophobic carbon-epoxy composites with improved mechanical properties. 33 Mixed layers have also been prepared by combined electro and photografting: a multilayer film of nitrophenyl groups was electrografted to a carbon surface and 4-aminophenylazide was further photografted to this surface from a spin-coated solution. 34 We present herein a protocol for the simultaneous gold surface modification by two different functional groups, starting from arylazo sulfones 1a-c as photoactivable precursors.…”