Dataset on cellulose nanoparticles from blue agave bagasse and blue agave leaves.

These data and analyses support the research article "Production of cellulose nanoparticles from blue agave waste treated with environmentally friendly processes" Robles et al. [1]. The data and analyses presented here include fitted curves for selected carbons of the 13C CP-MAS NMR analysis; SEM images of the raw and bleached fibers, graphics with chemical composition and visual images of the fibers throughout the process.

Specifications table

Value of the Data

These data provide the micrographics, chemical composition and crystallinity data of CNC and CNF from blue agave waste.

These data provide further information about NMR analyses of the different cellulose nanoentities.

These data allow researchers to extend the comprehension of the related article.

Data

The data in this article contains information on the chemical composition (Fig. 2), visual aspect of the fibers through pulping and bleaching (Fig. 3), SEM (Fig. 1 and Fig. 4) and AFM (Fig. 5) micrographics as well as NMR (Fig. 6) analysis of different cellulose nanoentities obtained from blue agave (Agave tequilana Weber var. azul) waste. For more information, please refer to Robles et al. [1].

Fig. 2

Chemical composition of leaf and bagasse fibers as obtained from TAPPI standard methods.

Fig. 3

Schematic depiction of the fibers after each treatment.

Fig. 1

SEM images of a) blue agave leaf fibers and b) blue agave bagasse fibers as received.

Fig. 4

SEM images of a) blue agave leaf fibers and b) blue agave bagasse fibers after Organosolv pulping and TCF bleaching.

Fig. 5

AFM images of CNF (left) normalized height from −5 to 10 nm and CNC (right) normalized height from −5 to 5 nm.

Fig. 6

Fitted curves for the C4 and C6 regions as obtained by 13C NMR.

Materials and methods

SEM images were obtained with a Scanning electron microscope Hitachi S-3400N with field emission cathode, with a lateral resolution of 10–11 Å at 20 kV.

Chemical characterization was done according to standard methods [2], [3], [4], [5], [6].

13C NMR spectrometry was performed at a frequency of 250 MHz with an acquisition time of 0.011 s, at room temperature. The spectrum was recorded over 32 scans and water was used as solvent for all the nanocelluloses.

CrystallinityCrystallinity indexes were calculated as follows:

Segal Index [7]:

In which I200 corresponds to the main crystalline domain at around 23°, and IAM is the scatter of the amorphous cellulose, which has its highest intensity around 2θ = 18°.

Peak fitting:

In which the sum of the areas correspondent to the diffraction of crystalline planes is assumed to be the area of the crystalline region, being 2θ1 and 2θ2 the limits of the fitted signal for the corresponding crystalline domains (S1–10, S110, S200, S004); while Stot corresponds to the total area [8], [9], [10]. Least square iterations were done until coefficient of determination R2 ≥ 0.997 was achieved, which corresponds to a 99.7% accurate fitting.

C4-NMR:

In which Scrys corresponds to the crystalline region of the C4 spectra (from 87 to 93 ppm) while Stot corresponds to the total area of the C4 region which includes crystalline and amorphous contribution.

Crystallite domain sizes (δ) were estimated with the Scherrer equation [11], [12]. using the peaks corresponding to the crystalline regions:The different crystallinities, as well as the contributions of each crystallite domain size, is present in Table 1

Table 1

Solid-state properties of the different nanoparticles as obtained from XRD and NMR. Cr.IX corresponds to the crystallinity index calculated with: SI-Segal Index, PF-Peak fitting, C4-NMR C6 NMR region; δ is the crystallite size approximated with the Scherrer equation.

Sample/Method	Cr.ISI [%]	Cr.IPF [%]	Cr.IC4	δ11-10 [Å]	δ110 [Å]	δ200 [Å]
CNFB	75.89	73.75	50.50	60.60	55.61	59.97
CNFL	72.29	72.16	51.32	38.15	30.03	47.44
CNCB	84.68	78.12	52.01	71.22	71.40	71.94
CNCL	87.10	82.65	63.76	49.85	37.47	44.83

Subject area	Chemistry
More specific subject area	Cellulose, nanocellulose
Type of data	Figures and graphs
How data was acquired	SEM (JSM-6400 F Scanning electron microscope, JEOL)
	NMR (AVANCE-500 Digital NMR spectrometer, Bruker)
	AFM (Multimode TM-AFM with NanoScope IIIa controller, Bruker)
	Images (COOLPIX S6400, Nikon)
Data format	Raw micrographs, fitted curves, analyzed graphics.
Experimental factors	SEM samples coated with graphite.
	AFM samples coated with
Experimental features	NMR data were recorded in solid state with Cross Polarization/Magic Angle Spinning
Data source location	AFM and visual images were taken at the Faculty of Engineering, Gipuzkoa, NMR data were collected at the Joxe Mari Korta Center, both within the Campus of Gipuzkoa of the University of the Basque Country UPV/EHU SEM images were recorded at the Faculty of Science and Technology of the University of the Basque Country UPV/EHU in the Campus of Biscay
Data accessibility	Data is accessible in the present document.
Related research article	Production of cellulose nanoparticles from blue agave waste treated with environmentally friendly processes.