Synthesis and swelling behavior of environmentally friendly starch-based superabsorbent hydrogels reinforced with natural char nano/micro particles

Motamedi, Elaheh; Motesharezedeh, Babak; Shirinfekr, Ahmad; Samar, Seyed Mahmood

doi:10.1016/j.jece.2019.103583

Cited by 71 publications

(31 citation statements)

References 61 publications

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“…Hydrogels are polymers with a crisscrossed three-dimensional structure which allows to absorb, store and release water molecules 1 . Its application is oriented to the manufacture of personal hygiene products, medical 2 , 3 , environmental 4 – 6 and agricultural applications 7 , 8 . Hydrogels for application in agriculture are usually synthesized based on acrylates or similar monomers (acrylamide, methyl methrillate among others), because cross-linked polymers with high absorption capacity and bloating rate are obtained 1 , 9 and low toxicity 10 , 11 .…”

Section: Introductionmentioning

confidence: 99%

Valorization of Colombian fique (Furcraea bedinghausii) for production of cellulose nanofibers and its application in hydrogels

Guancha-Chalapud

Gálvez

Serna-Cock

2020

Sci Rep

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Cellulose nanofibers were obtained from the Colombian fique (Furcraea bedinghausii) and Acrylic hydrogels (H) and reinforced acrylic hydrogels with fique nanofibres (HRFN) were synthesized, using the solution polymerization method. The extraction was carried out using a combined extraction method (chemical procedures and ultrasound radiation). The raw material (NAT-F), bleached fibers (B-F), hydrolyzed fibers and fibers treated with ultrasound (US-F) were characterized by infrared spectroscopy (FTIR) and thermal stability analysis; also, in order to have a comparison criterion, a commercial microcrystalline cellulose sample (CC) was analyzed, which demonstrated the extraction of fique cellulose. The surface morphology of the NAT-F and the B-F was determined by scanning electron microscopy and the average particle size of the nanofibers was made through transmission electron microscopy. In H y HRFN the strain percent and compression resistance (Rc) were measured. The fique nanofibers showed diameter and length averages of 25.2 ± 6.2 nm and 483.8 ± 283.2 nm respectively. Maximum degradation temperature was 317 °C. HRFN presented higher compression resistance (16.39 ± 4.30 kPa) and this resistance was 2.5 greater than the resistance of H (6.49 ± 2.48 kPa). The results indicate that fique lignocellulosic matrix has potential application for obtaining polymeric type composite materials.

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Section: Introductionmentioning

confidence: 99%

Valorization of Colombian fique (Furcraea bedinghausii) for production of cellulose nanofibers and its application in hydrogels

Guancha-Chalapud

Gálvez

Serna-Cock

2020

Sci Rep

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“…The pseudo-second order swelling kinetics model (Equation ( 3)) and the Ritger-Peppas model (Equation ( 4)) were used to analyze the experimental swelling data to evaluate the swelling behavior of SAPC, with results shown in Figure 6a,b [40][41][42]:…”

Section: Performance Tests Of Sapc 361 Swelling Kinetics Of Sapc In Distilled Watermentioning

confidence: 99%

Kaolin-Enhanced Superabsorbent Composites: Synthesis, Characterization and Swelling Behaviors

Chen

Zhang

et al. 2021

Polymers

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One type of low-cost and eco-friendly organic‒inorganic superabsorbent composite (SAPC) was synthesized by free radical polymerization of acrylic acid (AA), starch (ST), sodium alginate (SA) and kaolin (KL) in aqueous solution. The structure and morphology of the SAPC were characterized by Fourier transform infrared spectrometer (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The influence of different reaction conditions on water absorption of SAPC, i.e., SA and KL contents, AA neutralization degree (ND), potassium persulfate (KPS) and N, N′-methylenebisacrylamide (MBA) loading were systematically studied. Under the optimal synthesis conditions, very high water absorption of 1200 g/g was achieved. The swelling kinetic mechanism of SAPC was studied by pseudo-second order swelling kinetics model and Ritger‒Peppas model. The performances of SAPC under different environments were tested and results revealed that this new SAPC had excellent swelling capacity, high water retention, good salt tolerance in monovalent salt solution (NaCl solution) and good pH tolerance between 4 and 10.

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“…[88] (CC BY-NC 4.0) are more acidic than the respective base, and the ratios of the amounts of the different oxygen-containing FG can then be calculated directly from the base consumption. Boehm titration has been utilized to characterize the FG on different kinds of CNT [106][107][108] as well as on other carbon-based materials like ozone-treated nanodiamonds, carbon NP derived from organic resin, graphite-decorated MnFe 2 O 4 nanocomposites, and natural char nano-and microparticles [109][110][111][112]. To evaluate and standardize Boehm titration regarding accuracy, robustness, repeatability, and precision, Schönherr et al investigated the FG on oxidized multi-walled CNT using different reaction bases, treatment times, and amounts of carbon material [105,113].…”

Section: Boehm Titrationmentioning

confidence: 99%

Analyzing the surface of functional nanomaterials—how to quantify the total and derivatizable number of functional groups and ligands

et al. 2021

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Functional nanomaterials (NM) of different size, shape, chemical composition, and surface chemistry are of increasing relevance for many key technologies of the twenty-first century. This includes polymer and silica or silica-coated nanoparticles (NP) with covalently bound surface groups, semiconductor quantum dots (QD), metal and metal oxide NP, and lanthanide-based NP with coordinatively or electrostatically bound ligands, as well as surface-coated nanostructures like micellar encapsulated NP. The surface chemistry can significantly affect the physicochemical properties of NM, their charge, their processability and performance, as well as their impact on human health and the environment. Thus, analytical methods for the characterization of NM surface chemistry regarding chemical identification, quantification, and accessibility of functional groups (FG) and surface ligands bearing such FG are of increasing importance for quality control of NM synthesis up to nanosafety. Here, we provide an overview of analytical methods for FG analysis and quantification with special emphasis on bioanalytically relevant FG broadly utilized for the covalent attachment of biomolecules like proteins, peptides, and oligonucleotides and address method- and material-related challenges and limitations. Analytical techniques reviewed include electrochemical titration methods, optical assays, nuclear magnetic resonance and vibrational spectroscopy, as well as X-ray based and thermal analysis methods, covering the last 5–10 years. Criteria for method classification and evaluation include the need for a signal-generating label, provision of either the total or derivatizable number of FG, need for expensive instrumentation, and suitability for process and production control during NM synthesis and functionalization. Graphical abstract

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Synthesis and swelling behavior of environmentally friendly starch-based superabsorbent hydrogels reinforced with natural char nano/micro particles

Cited by 71 publications

References 61 publications

Valorization of Colombian fique (Furcraea bedinghausii) for production of cellulose nanofibers and its application in hydrogels

Valorization of Colombian fique (Furcraea bedinghausii) for production of cellulose nanofibers and its application in hydrogels

Kaolin-Enhanced Superabsorbent Composites: Synthesis, Characterization and Swelling Behaviors

Analyzing the surface of functional nanomaterials—how to quantify the total and derivatizable number of functional groups and ligands

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