Preparation, properties and applications of polysaccharide nanocrystals in advanced functional nanomaterials: a review

Lin, Ning; Huang, Jin; Dufresne, Alain

doi:10.1039/c2nr30260h

Cited by 807 publications

(480 citation statements)

References 267 publications

(272 reference statements)

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“…In particular, the absorption spectrum (Fig. 1b) exhibited the typical well-resolved peak at 230 nm, due to the π-π* transition of the aromatic sp 2 domains, and a less pronounced shoulder at ∼305 nm, which is generally attributed to the n-π* transition in C=O bonds of oxygencontaining functional groups [14]. This latter structure became a distinct peak at approximately 310 nm in the excitation spectrum (inset in Fig.…”

Section: Optical Characterization Of Ufqdsmentioning

confidence: 89%

“…In the past decade, the research on nanomaterials has undergone a huge development in many different fields such as medicine, biology, energy and sensors [1][2][3][4][5][6]. In particular, innovative carbon-based nanomaterials such as graphene quantum dots (GQDs) and graphene oxide quantum dots (GOQDs) have attracted much interest as stable, nontoxic, photoluminescent nanomaterials with possible applications in chemical and biological sensors, drug delivery, bio-imaging and energy conversion [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, innovative carbon-based nanomaterials such as graphene quantum dots (GQDs) and graphene oxide quantum dots (GOQDs) have attracted much interest as stable, nontoxic, photoluminescent nanomaterials with possible applications in chemical and biological sensors, drug delivery, bio-imaging and energy conversion [7][8][9][10][11][12][13]. The physical origin of the photoluminescence (PL) from these carbonbased nanoparticles is still quite controversial and different mechanisms have been suggested, possibly acting together, mainly based on quantum confinement in sp 2 domains with a strong influence from edge and oxygen-containing functional groups [14][15][16][17][18]. Nonetheless, several groups have reported a characteristic fluorescence with uniform and stable features in aqueous solution of GOQDs prepared by a variety of methods, either based on bottom-up or on top-down synthesis from graphite [19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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A novel type of graphene-like quantum dots, synthesized by oxidation and cage-opening of C60 buckminsterfullerene, has been studied as a fluorescent and absorptive probe for heavy-metal ions.The lattice structure of such unfolded fullerene quantum dots (UFQDs) is distinct from that of graphene since it includes both carbon hexagons and pentagons. The basic optical properties, however, are similar to those of regular graphene oxide quantum dots. On the other hand, UFQDs behave quite differently in the presence of heavy-metal ions, in that multiple sensitivity to Cu 2+ , Pb 2+ and As(III) was observed through comparable quenching of the fluorescent emission and different variations of the transmittance spectrum. By dynamic light scattering measurements we confirmed, for the first time in metal sensing, that this response is due to multiple complexation and subsequent aggregation of UFQDs. Nonetheless, the explanation of the distinct behaviour of transmittance in the presence of As(III) and the formation of precipitate with Pb 2+ require further studies. These differences, however, also make it possible to discriminate between the three metal ions in view of the implementation of a selective multiple sensor.

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Section: Optical Characterization Of Ufqdsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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“…The distinct properties of nanocelluloses open a wide field of applications in composites (Cai et al 2012;Li et al 2014), insulation (Hayase et al 2014;Kobayashi et al 2014), packaging (Aulin et al 2010;Lavoine et al 2014), tissue engineering (Domingues et al 2014;Markstedt et al 2015) and many other utilization ways (Habibi et al 2010;Lin et al 2012). Nevertheless, drying of nanocelluloses with retention of their unique properties, in particular the high surface areas, remains a difficult and important challenge.…”

mentioning

confidence: 99%

Surface properties and porosity of highly porous, nanostructured cellulose II particles

et al. 2016

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Recently, a new member of the nanocellulose family was introduced, a cellulose II gel consisting of nanostructured and spherical particles. In this study, we compared two different drying techniques to obtain highly porous powders from this gel with preserved meso-and macroporous nanostructure: first, freeze-drying after solvent exchange to tBuOH and second, supercritical drying of the respective EtOH alcogel. The approaches yielded aerogel powders with surface areas of 298 and 423 m 2 /g, respectively. Both powders are amphiphilic and possess energetically heterogeneous surfaces with dominating dispersive term of the surface energy in the range of 50-52 mJ/m 2 , as determined by a combination of physicochemical surface characterization techniques, such as iGC, BET and SEM. Despite the lower surface area, the cheaper and more widespread method, freeze-drying, yields a more polar and reactive cryogel.Keywords Nanocellulose Á Lyocell Á Inverse gas chromatography Á Thermoporosimetry Á Freezedrying Á Supercritical drying Abbreviations CNFCellulose nanofibrils FD Freeze-drying scCO 2 Supercritical CO 2 Electronic supplementary material The online version of this article

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“…The density (q CN ), width (d 0 ), and length (L 0 ) of two glucose units of 1.0 g NC are constant, which are 1.606 g cm -3 , 0.79, and 1.03 nm, respectively (Lin et al 2012). The average width (d) and average length (L) were computed by PSD and XRD analysis, respectively.…”

Section: Preparation Of Nanocellulose (Nc)mentioning

confidence: 99%

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

2015

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Site-specific functionalizations are the emergent attention for the enhancement of sorption latent of heavy metals. Limited chemistry has been applied for the fabrication of diafunctionalized materials having potential to tether both environmentally stable oxidation states of chromium (Cr(III) and Cr(VI). Polyaniline impregnated nanocellulose composite (PANI-NCC) has been fabricated using click chemistry and explored for the removal of Cr(III) and Cr(VI) from hydrological environment. The structure, stability, morphology, particle size, surface area, hydrophilicity, and porosity of fabricated PANI-NCC were characterized comprehensively using analytical techniques and mathematical tools. The maximum sorption performance of PANI-NCC was procured for (Cr(III): 47.06 mg g -1 ; 94.12 %) and (Cr(VI): 48.92 mg g -1 ; 97.84 %) by equilibrating 0.5 g sorbent dose with 1000 mL of 25 mg L -1 chromium conc. at pH 6.5 and 2.5 for Cr(III) and Cr(VI), respectively. The sorption data showed a best fit to the Langmuir isotherm and pseudosecond-order kinetic model. The negative value of DG°(-8.59 and -11.16 kJ mol -1 ) and DH°(66.46 9 10 -1 and 17.84 9 10 -1 kJ mol -1 ), and positive value of DS°(26.66 and 31.46 J mol -1 K -1 ) for Cr(III) and Cr(VI), respectively, reflect the spontaneous, feasibility, and exothermic nature of the sorption process. The application of fabricated PANI-NCC for removing both the forms of chromium in the presence of other heavy metals was also tested at laboratory and industrial waste water regime. These findings open up new avenues in the row of high performance, scalable, and economic nanobiomaterial for the remediation of both forms of chromium from water streams.

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Preparation, properties and applications of polysaccharide nanocrystals in advanced functional nanomaterials: a review

Cited by 807 publications

References 267 publications

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Surface properties and porosity of highly porous, nanostructured cellulose II particles

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

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