One-Step Synthesis of Quadrilateral-Shaped Silver Nanoplates with Lamellar Structures Tuned by Amylopectin Derivatives

Abstract

Polymers or small molecules with functional groups were always employed to synthesize two-dimensional (2D) silver nanostructures, but the polysaccharides and derivatives have rarely been used for their preparation, let alone of uniform quadrilateral shapes. Herein, amylopectin derivatives containing concentrated carboxyl groups were first used for the synthesis of uniform 2D quadrilateral silver nanoplates (QAgNPs) with lamellar structure. As a native hyperbranched polysaccharide, amylopectin was esterified with 10-undecenoyl chloride and then modified via thiol–ene click chemistry to introduce high amount and high density of carboxyl groups. Then, QAgNPs were synthesized via UV photoreduction in the presence of the resultant amylopectin 11-((3-carboxyl)ethylthio)undecanoate (APUE 3 -MPA) in water–tetrahydrofuran binary system. QAgNPs showed novel uniform quadrilateral shapes with lamellar structure, as verified by their wide-angle X-ray scattering patterns. The average interlayer distance was around 1.3 nm, whereas the average edge lengths of QAgNPs varied between 0.29 ± 0.07 and 1.09 ± 0.25 μm. The concentration of APUE 3 -MPA and the amount of water in the reaction system strongly affected the shapes of QAgNPs. Thus, the reaction system and the arrangement of numerous carboxyl groups were the key factors for the formation of lamellar-structured QAgNPs.

Incorporating Conducting Polypyrrole into a Polyimide COF for Carbon‐Free Ultra‐High Energy Supercapacitor

“…[ 45 ] Interestingly we observed good intensities for the O 1s (at 532.2 eV) and S 2p (at 168.9 and 170.9 eV) peaks in the XPS, arising from the sulfate (SO 4 2− ) ions. [ 59 ] These observations sufficiently justify our proposed mechanism: dual ion interaction to amplify the redox activity window.…”

Selective esterification of glycerol over ionic liquid functionalized cellulose (IMD-Si/HSO4@Cellulose) under energy-efficient microwave irradiation

“…7f) consisted of high-intensity peaks at binding energies of 100.6 eV and 166.2 eV, respectively. 11,19…”

“…7f) consisted of high-intensity peaks at binding energies of 100.6 eV and 166.2 eV, respectively. 11,19 Furthermore, the weight % of elements obtained from XPS analysis showed that each element was present in a stoichiometric amount in the synthesized catalysts (IMD-Si/ HSO 4 @Cellulose) (Table 1). The % content of N 1s (9.57%), Si 2p (5.18%) and S 2p (1.31%) confirmed the presence of a suitable amount of IMD-Si/HSO 4 in the catalyst.…”

“…As confirmed from the earlier reports, 23 selectivity often depends on catalyst activity and % conversion but at a high conversion level, actual selectivity can be misinterpreted. Hence, catalytic comparison at a low conversion level was investigated and is given in Table 3 (entries [13][14][15][16][17][18][19][20]. The reaction was carried out under the conventional heating conditions to compare the results fairly as all the reported reactions (Table 3, entries [13][14][15][16][17][18][19][20][21] were performed in conventional heating conditions.…”

“…Hence, catalytic comparison at a low conversion level was investigated and is given in Table 3 (entries [13][14][15][16][17][18][19][20]. The reaction was carried out under the conventional heating conditions to compare the results fairly as all the reported reactions (Table 3, entries [13][14][15][16][17][18][19][20][21] were performed in conventional heating conditions. At a low to moderate level of conversion, triacetin selectivity (33%) was very high as compared to other catalysts which showed that IMD-Si/HSO 4 @Cellulose can be used as a universal catalyst at both Paper Materials Advances low and high conversion levels (Table 3, entries 20).…”