Carboxymethyl Cellulose Nanofibrils with a Treelike Matrix: Preparation and Behavior of Pickering Emulsions Stabilization

2019 ◽  
Vol 7 (15) ◽  
pp. 12887-12896 ◽  
Author(s):  
Jie Wei ◽  
Yi Zhou ◽  
Yanyan Lv ◽  
Jianquan Wang ◽  
Chao Jia ◽  
...  
Keyword(s):  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Pickering Emulsions ◽  
And Behavior ◽  
Matrix Preparation

scholarly journals Nanoarchitectonics for High Adsorption Capacity Carboxymethyl Cellulose Nanofibrils-Based Adsorbents for Efficient Cu2+ Removal

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 160
Author(s):  
Rongrong Si ◽  
Yehong Chen ◽  
Daiqi Wang ◽  
Dongmei Yu ◽  
Qijun Ding ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Maximum Adsorption Capacity ◽  
Crosslinking Reaction ◽  
Carboxyl Content ◽  
Edta Solution ◽  
Effects Of Ph ◽  
Adsorption Desorption

In the present study, carboxymethyl cellulose nanofibrils (CMCNFs) with different carboxyl content (0.99–2.01 mmol/g) were prepared via controlling the ratio of monochloroacetic acid (MCA) and sodium hydroxide to Eucalyptus bleached pulp (EBP). CMCFs-PEI aerogels were obtained using the crosslinking reaction of polyethyleneimine (PEI) and CMCNFs with the aid of glutaraldehyde (GA). The effects of pH, contact time, temperature, and initial Cu2+ concentration on the Cu2+ removal performance of CMCNFs-PEI aerogels was highlighted. Experimental data showed that the maximum adsorption capacity of CMCNF30-PEI for Cu2+ was 380.03 ± 23 mg/g, and the adsorption results were consistent with Langmuir isotherm (R2 > 0.99). The theoretical maximum adsorption capacity was 616.48 mg/g. After being treated with 0.05 M EDTA solution, the aerogel retained an 85% removal performance after three adsorption–desorption cycles. X-ray photoelectron spectroscopy (XPS) results demonstrated that complexation was the main Cu2+ adsorption mechanism. The excellent Cu2+ adsorption capacity of CMCNFs-PEI aerogels provided another avenue for the utilization of cellulose nanofibrils in the wastewater treatment field.

scholarly journals Surfactant-Free Cellulose Filaments Stabilized Oil in Water Emulsions

2021 ◽  
Author(s):  
Amir Varamesh ◽  
Ragesh Prathapan ◽  
Ali Telmadarreie ◽  
Jia Li ◽  
Keith Gourlay ◽  
...  
Keyword(s):  
Droplet Size ◽  
Fluorescent Protein ◽  
Fluorescent Microscopy ◽  
Cellulose Nanofibrils ◽  
Continuous Phase ◽  
Carbohydrate Binding ◽  
Pickering Emulsions ◽  
Cellulosic Material ◽  
Oil In Water ◽  
Wide Range

Abstract There has been significant interest over recent years in the production and application of sustainable and green materials. Among these, nanocellulose has incurred great interest because of its exceptional properties and wide range of potential applications, including in Pickering emulsions. However, the production cost of these cellulosic materials has limited their application. In this study, the capability of a new type of cheaper cellulosic material, cellulose filaments (CFs), in formulating stable oil in water Pickering emulsions was investigated and compared with three conventional nanocelluloses, namely cellulose nanocrystals (CNCs), cellulose nanofibrils (CNFs) and TEMPO-oxidized CNFs (TEMPO-CNFs). Results showed that CFs can provide stable surfactant-free emulsions over wide ranges of salt concentration (0 – 500 mM) and pH (2 – 10), as indicated by the near constant oil droplet size and dewatering index of the emulsions. This is due to the ability of CFs to strongly adsorb to the oil and water interface, as evidenced by visualizing labeled CFs with engineered carbohydrate-binding module (CBM2a) conjugated with green fluorescent protein (CBM2a-eGFP) under fluorescent microscopy. Compared to the emulsions stabilized by other types of nanocelluloses, the CFs-stabilized emulsion demonstrated a larger average droplet size and comparable (with CNFs) or better (than CNCs and TEMPO-CNFs) stability, which is partially attributed to the higher viscosity of continuous phase in the presence of CFs. The results of this study demonstrate the use of CFs as a novel and cheaper cellulosic material for stabilizing emulsions, which opens the door to a range of markets from the food industry to engineering applications.

Residual lignin in cellulose nanofibrils enhances the interfacial stabilization of Pickering emulsions

2021 ◽  
Vol 253 ◽  
pp. 117223
Author(s):  
Shasha Guo ◽  
Xia Li ◽  
Yishan Kuang ◽  
Jianming Liao ◽  
Kai Liu ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Residual Lignin ◽  
Pickering Emulsions

Development of food-grade Pickering emulsions stabilized by a mixture of cellulose nanofibrils and nanochitin

2020 ◽  
pp. 106451 ◽  
Author(s):  
Shanshan Lv ◽  
Hualu Zhou ◽  
Long Bai ◽  
Orlando J. Rojas ◽  
David Julian McClements
Keyword(s):  
Cellulose Nanofibrils ◽  
Pickering Emulsions ◽  
Food Grade

Stabilization of Pickering Emulsions by Bacterial Cellulose Nanofibrils

2015 ◽  
Vol 645-646 ◽  
pp. 1247-1254 ◽  
Author(s):  
Wei Fu ◽  
Yang Liu ◽  
Chen Yang ◽  
Wen Hua Wang ◽  
Man Wang ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Emulsion Stability ◽  
Ph Value ◽  
Cellulose Nanofibrils ◽  
Pickering Emulsions ◽  
Sustainable Food ◽  
Ph Values ◽  
Oil Water ◽  
Maize Oil

In order to develop safe and sustainable food and pharmaceutical emulsions, bacterial cellulose (BC) nanofibrils were prepared to stabilize maize oil/water Pickering emulsions. The influence of BC content and pH value on the emulsion stability was explored. Droplet diameters decreased with BC contents in emulsions. At pH 12, the emulsions were most stable among all tested pH values. The transformation of emulsion structure from liquid to gel-like at 8-15°C with BC content higher than 1.55 g/L is predominantly depended on the viscoelastic entangled BC network. These results can have meaningful inspiration of designing edible food and pharmaceutical emulsions.

scholarly journals Salt-Responsive Pickering Emulsions Stabilized by Functionalized Cellulose Nanofibrils

Langmuir ◽  
2021 ◽  
Author(s):  
James C. Courtenay ◽  
Yun Jin ◽  
Julien Schmitt ◽  
Kazi M. Zakir Hossain ◽  
Najet Mahmoudi ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Pickering Emulsions

Controlled Dispersion and Setting of Cellulose Nanofibril (CNF) - Carboxymethyl Cellulose (CMC) Pastes

2021 ◽  
Author(s):  
Sami Miguel El Awad Azrak ◽  
Jared Gohl ◽  
Robert Moon ◽  
Gregory Schueneman ◽  
Chelsea Davis ◽  
...  
Keyword(s):  
Chemical Treatment ◽  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Ftir Analysis ◽  
Screw Extruder ◽  
Absorption Bands ◽  
Wet Strength ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Charge Change

Abstract This work investigated the redispersion and setting behavior of highly loaded (~18 wt.% solids in water) pastes of cellulose nanofibrils (CNFs) with carboxymethyl cellulose (CMC). A single-screw extruder was used to continuously process CNF+CMC pastes into cord. The adsorption of CMC onto the CNF fibrils was assessed through zeta potential and titration which revealed a surface charge change of ~61 % from -36.8 mV and 0.094 mmol/g COOH for pure CNF to -58.1 mV and 0.166 mmol/g COOH for CNF+CMC with a CMC degree of substitution of 0.9. Dried CNF with adsorbed CMC was found to be fully redispersible in water and re-extruded back into a cord without any difficulties. On the other hand, chemical treatment with hydrochloric acid, a carbodiimide crosslinker, or two wet strength enhancers (polyamide epichlorohydrin and polyamine epichlorohydrin) completely suppressed the dispersibility previously observed for dried-untreated CNF+CMC. Turbidity was used to quantify the level of redispersion or setting achieved by the untreated and chemically treated CNF+CMC in both water and a strong alkaline solution (0.1 M NaOH). Depending on the chemical treatment used, FTIR analysis revealed the presence of ester, N-acyl urea, and anhydride absorption bands which were attributed to newly formed linkages between CNF fibrils, possibly explaining the suppressed redispersion behavior. Water uptake of the differently treated and dried CNF+CMC materials agreed with both turbidity and FTIR results.

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