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Ali H Tayeb, Mehdi Tajvidi
Cellulose nanofibrils (CNFs) are able to form strong oxygen-barrier films suitable for food packaging but lack the needed water resistance in comparison to plastics. Desired water barrier quality can be achieved by applying mineral additives within the nanofibrils network. In current contribution, a sustainable hybrid system with improved water-barrier function is proposed by incorporating colloidal montmorillonite nano-clay (MMT) and two crosslinking agents namely; polyamidoamine epichlorohydrin (PAE) and Acrodur® thermoset acrylic resin (ACR) into CNF interfaces...
December 12, 2018: ACS Applied Materials & Interfaces
Llyza Mendoza, Laila Hossain, Emma Downey, Camilla Scales, Warren Batchelor, Gil Garnier
HYPOTHESIS: Carboxylated nanocellulose fibres formed into foam structures can demonstrate superabsorption capacity. Their performance can be engineered by changing process variables. EXPERIMENTS: TEMPO-oxidised cellulose nanofibres of varying concentration and surface charge are produced from hardwood kraft pulp. Foams were prepared through a 2-step freezing and lyophilisation process. The absorption capacity of water and saline solution (0.9 wt%) were measured as a function of time and related to the foam structure...
December 1, 2018: Journal of Colloid and Interface Science
Ana Cristina Rodrigues, Ana Isabel Fontão, Aires Coelho, Marta Leal, Francisco A G Soares da Silva, Yizao Wan, Fernando Dourado, Miguel Gama
This work aimed at the optimization of bacterial nanocellulose (BNC) production by static culture, using Komagataeibacter xylinus BPR 2001 (K. xylinus). Response surface methodology - central composite design was used to evaluate the effect of inexpensive and widely available nutrient sources, namely molasses, ethanol, corn steep liquor (CSL) and ammonium sulphate, on BNC production yield. The optimized parameters for maximum BNC production were % (m/v): molasses 5.38, CSL 1.91, ammonium sulphate 0.63, disodium phosphate 0...
December 6, 2018: New Biotechnology
Maija-Liisa Mattinen, Guillaume Riviere, Alexander Henn, Robertus Wahyu N Nugroho, Timo Leskinen, Outi Nivala, Juan José Valle-Delgado, Mauri A Kostiainen, Monika Österberg
Lignin has interesting functionalities to be exploited in adhesives for medicine, foods and textiles. Nanoparticles (NPs) < 100 nm coated with poly (L -lysine), PL and poly(L -glutamic acid) PGA were prepared from the laccase treated lignin to coat nanocellulose fibrils (CNF) with heat. NPs ca. 300 nm were prepared, β-casein coated and cross-linked with transglutaminase (Tgase) to agglutinate chamois. Size exclusion chromatography (SEC) and Fourier-transform infrared (FTIR) spectroscopy were used to characterize polymerized lignin, while zeta potential and dynamic light scattering (DLS) to ensure coating of colloidal lignin particles (CLPs)...
December 3, 2018: Nanomaterials
Sivoney Ferreira Souza, Marcos Mariano, Marcelo A De Farias, Juliana Silva Bernardes
Cellulose nanofibers (CNF) can present a high viscosity and thixotropic behavior when dispersed in water. In this work, CNF isolated from sugarcane bagasse and modified by N-oxyl-2,2,6,6-tetramethylpiperidine (TEMPO) oxidation was added to a solution of carboxymethyl cellulose (CMC). This process produced an unexpected viscosity due to a synergistic effect that was observed macroscopically through rheology analysis. The phenomenon known as depletion flocculation was observed, which was caused by the reduction of the excluded volume...
November 26, 2018: Journal of Colloid and Interface Science
Natalia V Lukasheva, Dmitry A Tolmachev, Mikko Karttunen
Cellulose can be phosphorylated to produce organic matrices with highly adsorptive properties for, e.g., biocompatible materials for biomedical applications. We focus on the effects of phosphorylation of surfaces of crystalline nanocellulose and, in particular, on the competitive adsorption of mono- and divalent cations (Na+ and Ca2+) typically contained in mineralizing salt mixtures using all-atom molecular dynamics (MD) simulations. Phosphorylation was applied at 12% and 25% both in water and CaCl2 solutions...
December 4, 2018: Physical Chemistry Chemical Physics: PCCP
Ives Bernardelli de Mattos, Judith C J Holzer, Alexandru-Cristian Tuca, Florian Groeber-Becker, Martin Funk, Daniel Popp, Selma Mautner, Thomas Birngruber, Lars-Peter Kamolz
BACKGROUND: With the increase of antimicrobial resistance in recent decades, other methods of preventing and fighting infections must be considered. Burn patients, whose wound areas are often extensive, are especially prone to wound infections. The loading of bacterial nanocellulose (BNC) with antiseptics has already been successfully performed but unfortunately, the described procedure is time-consuming and thus not applicable in a clinical emergency setting. Therefore, a clinically feasible approach was established...
November 30, 2018: Burns: Journal of the International Society for Burn Injuries
Amir Sheikhi, Joel Hayashi, James Eichenbaum, Mark Gutin, Nicole Kuntjoro, Danial Khorsandi, Ali Khademhosseini
The recent decade has witnessed a growing demand to substitute synthetic materials with naturally-derived platforms for minimizing their undesirable footprints in biomedicine, environment, and ecosystems. Among the natural materials, cellulose, the most abundant biopolymer in the world with key properties, such as biocompatibility, biorenewability, and sustainability has drawn significant attention. The hierarchical structure of cellulose fibers, one of the main constituents of plant cell walls, has been nanoengineered and broken down to nanoscale building blocks, providing an infrastructure for nanomedicine...
November 27, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Anurodh Tripathi, Mariko Ago, Saad A Khan, Orlando J Rojas
Heterogeneous acetylation of wood fibers is proposed for weakening their interfibrillar hydrogen bonding, which facilitates their processing into micro- and nanocelluloses that can be further used to synthesize filaments via wet-spinning. The structural (SEM, WAXD), molecular (SEC) and chemical (FTIR, titration) properties of the system are used to propose the associated reaction mechanism. Unlike the homogeneous acetylation, this method does not alter the main morphological features of cellulose fibrils. Thus, we show for the first time, the exploitation of synergies of compositions simultaneously comprising dissolved cellulose esters and suspended cellulose micro- and nanofibrils...
November 28, 2018: ACS Applied Materials & Interfaces
Juan Jose Pavón, Jean Paul Allain, Devendra Verma, Mónica Echeverry-Rendón, Christy L Cooper, Lisa M Reece, Akshath R Shetty, Vikas Tomar
Surgical clipping and endovascular coiling are well recognized as conventional treatments of Penetrating Brain Injury aneurysms. These clinical approaches show partial success, but often result in thrombus formation and the rupture of aneurysm near arterial walls. The authors address these challenging brain traumas with a unique combination of a highly biocompatible biopolymer hydrogel rendered magnetic in a flexible and resilient membrane coating integrated to a scaffold stent platform at the aneurysm neck orifice, which enhances the revascularization modality...
November 19, 2018: Macromolecular Bioscience
Amira M El-Shafei, Abeer M Adel, Atef A Ibrahim, Mona T Al-Shemy
In the present study, phosphorylated nanocellulose (P-NC) has been prepared from date palm sheath fibers by a solvent-free acid hydrolysis procedure. Eighteen different treatment procedures were employed for the composite treatment of jute fabric. Different fractions of phosphorylated nanocellulose (1-4%) and chitosan (0.5-2%) were used to examine the effects of treatment procedures on the resulting jute fabric composites. Weight uptake, phosphorus content and tensile properties of the treated jute fabrics have been reported...
November 15, 2018: International Journal of Biological Macromolecules
Jie Chen, Meizhen Huang, Lili Kong, Mengshi Lin
This study aimed to develop a jellylike flexible substrate based on nanocellulose decorated with Ag nanoparticles (Ag/NC substrate) and explore its applications for rapid in-situ pesticide detections in fruits and vegetables by surface-enhanced Raman spectroscopy (SERS). The performances of Ag/NC substrate were characterized by rhodamine 6G (R6G). The limit of detection recorded by a portable Raman spectrometer is 10-8 M. The substrate still exhibited satisfactory sensitivity after 60-day preservation. Jellylike and slightly sticky Ag/NC substrate demonstrated good adaptabilities in attaching to sample surfaces and is suitable for in-situ SERS detection...
February 1, 2019: Carbohydrate Polymers
Rh Fitri Faradilla, George Lee, Pavallam Sivakumar, Martina Stenzel, Jayashree Arcot
The aims of this study were to investigate the effects of polyethylene glycol (PEG) molecular weight (MW) and PEG interaction with nanofillers (nanoclay and graphene oxide) on the properties of banana pseudostem nanocellulose films. PEG MW significantly affected the properties of the films. Low MW PEGs (400 and 1000 g/mol) had better interaction with nanocellulose than the PEG with higher MW and improved the flexibility of the films by about 100%. Interaction between PEG1000 and nanofillers significantly modified the properties of the composite films...
February 1, 2019: Carbohydrate Polymers
Ting Zheng, Zhan Zhang, Srishti Shukla, Shubh Agnihotri, Craig M Clemons, Srikanth Pilla
Reactive extrusion was used for dicumyl peroxide (DCP)-initiated grafting of glycidyl methacrylate (GMA) to poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The effects of GMA and DCP content and their weight ratio on the GMA grafting percentage (GP%), the polymer melt viscosity, and the PHBV molecular weight were investigated. FTIR spectroscopy determined that the DCP did indeed initiate GMA grafting. However, the changes in both the zero-shear viscosity (η0 ) and the molecular weight suggested the existence of crosslinking products in the extruded polymers...
February 1, 2019: Carbohydrate Polymers
Thanakorn Niamsap, Nga Tien Lam, Prakit Sukyai
Bacterial nanocellulose/hydroxyapatite/cellulose nanocrystal (BHC) composites were synthesized via in-situ synthesis using cellulose nanocrystals (CNCs) to improve colloidal stability and the dispersion of hydroxyapatite (HA) during the bacterial nanocellulose (BNC) cultivation period. Transmission electron microscopy images and energy dispersive spectroscopy (EDS) results confirmed the dispersion of HA on the CNC particles with a Ca/P ratio of 1.66 corresponding to that of the stoichiometric HA. The SEM images and EDS results showed that the integration of the HA and BNC network without CNC assistance (BHA (0...
February 1, 2019: Carbohydrate Polymers
Md Qumrul Hasan, Jonathan Yuen, Gymama Slaughter
Carbon nanotube (CNT)-cellulose pellicle was developed to create a conductive CNT network on 20 μm nanostructured cellulose film. The flexible and electrically conductive film was prepared by the modification of bacterial nanocellulose pellicle with multi-walled carbon nanotubes (MWCNTs). The composite film was further modified with redox enzymes including pyroquinoline quinone glucose dehydrogenase (PQQ-GDH) and bilirubin oxidase (BODx) functioning as the anodic and cathodic catalyst, respectively with glucose as the biofuel source...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Rachel M B Valentim, Sabina M C Andrade, Maria E M Dos Santos, Aline C Santos, Victor S Pereira, Izael P Dos Santos, Carmen G B T Dias, Marcos A L Dos Reis
The use of lignocellulosic remnants of the açaí agro-business will benefit the environment with a precursor material for biomedical applications. Nanocellulose (NC) allows the biomimetic growth of biphasic ceramics on its surface, with characteristics compatible with bone tissue, including bioactive properties and biocompatibility. In this study, the composites were obtained from açaí tegument ( Euterpe Oleracea Mart.) NC using acid hydrolysis. The characterization performed by scanning electron microscopy showed the characteristic crystals of hydroxyapatite (HA) and calcium triphosphate (β-TCP) based on the results of X-ray diffraction, with the peak at 22°, showing the NC nucleation of HA and peak at 17° showing tricalcium phosphate (β-TCP)...
November 8, 2018: Materials
Thomas Paulraj, Stefan Wennmalm, Anastasia V Riazanova, Qiong Wu, Gaston A Crespo, Anna J Svagan
Cellulose nanofibers (CNFs) have recently attracted a lot of attention in sensing because of their multifunctional character and properties such as renewability, nontoxicity, biodegradability, printability, and optical transparency in addition to unique physicochemical, barrier, and mechanical properties. However, the focus has exclusively been devoted toward developing two-dimensional sensing platforms in the form of nanopaper or nanocellulose-based hydrogels. To improve the flexibility and sensing performance in situ, for example, to detect biomarkers in vivo for early disease diagnostics, more advanced CNF-based structures are needed...
November 26, 2018: ACS Applied Materials & Interfaces
Bejoy Thomas, Midhun C Raj, Athira K B, Rubiyah M H, Jithin Joy, Audrey Moores, Glenna L Drisko, Clément Sanchez
With increasing environmental and ecological concerns due to the use of petroleum-based chemicals and products, the synthesis of fine chemicals and functional materials from natural resources is of great public value. Nanocellulose may prove to be one of the most promising green materials of modern times due to its intrinsic properties, renewability, and abundance. In this review, we present nanocellulose-based materials from sourcing, synthesis, and surface modification of nanocellulose, to materials formation and applications...
November 7, 2018: Chemical Reviews
R Pramanik, B Ganivada, Farsa Ram, Kadhiravan Shanmuganathan, A Arockiarajan
Xerogels are porous networks of crosslinked polymers that are useful for biomedical applications such as drug delivery, scaffold engineering, tissue regeneration, cell culture and wound dressing. However, inferior mechanical properties curtail their applications to a considerable extent. Nanocellulose fibers and crystals are often added into the polymer matrix to improve their mechanical strength. Here, nanocellulose in the mass ratios of 7%, 13% and 18% are loaded into polyvinyl alcohol (PVA) matrix followed by thermo-morpho-mechanical characterization...
October 19, 2018: Journal of the Mechanical Behavior of Biomedical Materials
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