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Francisco J Martin-Martinez, Kai Jin, Diego López Barreiro, Markus J Buehler
Mimicking Nature implies the use of bio-inspired hierarchical designs to manufacture nanostructured materials. Such materials should be produced from sustainable sources ( e.g., biomass) and through simple processes that use mild conditions, enabling sustainable solutions. The combination of different types of nanomaterials and the implementation of different features at different length scales can provide synthetic hierarchical nanostructures that mimic natural materials, outperforming the properties of their constitutive building blocks...
August 13, 2018: ACS Nano
Bo Sun, Weijun Wang, Zhibin He, Min Zhang, Fangong Kong, Mohini Sain, Yonghao Ni
Tea polyphenols have received much attention from the pharmaceutical and food industries owing to their extraordinary antioxidant and antibacterial characteristics. However, tea polyphenols are very unstable to processing and storage, since they are sensitive to the environmental factors like temperature, light and pH. Therefore, the effective application of tea polyphenols requires a protective mechanism to maintain its activity. The utilization of compounded tea polyphenols, instead of raw materials, can potentially help to improve their stability...
August 10, 2018: Current Pharmaceutical Design
Milena Martelli-Tosi, Maraiane M Masson, Natália C Silva, Bruno S Esposto, Taís T Barros, Odílio B G Assis, Delia R Tapia-Blácido
This work is a comparative study of the application of mercerized soybean straw (MSS) and nanocellulose produced by acid (CNCs) or enzymatic hydrolysis (CNFs) as reinforcing fillers in soy protein isolate (SPI) films. CNCs presented average dimensions of about 10 nm-thick and 300 nm-long with a crystallinity index of 57%, whereas CNFs have similar diameters, though with greater lengths (>1 μm), lower crystallinity index (50%) and greater thermal stability. Incorporation of 5% of CNCs and CNFs (g/100 g of SPI) improved the SPI film tensile strength by 38 and 48% respectively, and decreased the SPI film elongation at break when compared to control films...
October 15, 2018: Carbohydrate Polymers
Stuart Kyle, Zita M Jessop, Ayesha Al-Sabah, Karl Hawkins, Aled Lewis, Thierry Maffeis, Cecile Charbonneau, Andrea Gazze, Lewis W Francis, Mikhail Iakovlev, Kim Nelson, Stephen J Eichhorn, Iain S Whitaker
Bioinspiration from hierarchical structures found in natural environments has heralded a new age of advanced functional materials. Nanocellulose has received significant attention due to the demand for high-performance materials with tailored mechanical, physical and biological properties. In this study, nanocellulose fibrils, nanocrystals and a novel mixture of fibrils and nanocrystals (blend) were prepared from softwood biomass using the AVAP® biorefinery technology. These materials were characterized using transmission and scanning electron microscopy, and atomic force microscopy...
October 15, 2018: Carbohydrate Polymers
Sachin Agate, Michael Joyce, Lucian Lucia, Lokendra Pal
Flexible-hybrid printed electronics (FHPE) is a rapidly growing discipline that may be described as the precise imprinting of electrically functional traces and components onto a substrate such as paper to create functional electronic devices. The mass production of low-cost devices and components such as environmental sensors, bio-sensors, actuators, lab on chip (LOCs), radio frequency identification (RFID) smart tags, light emitting diodes (LEDs), smart fabrics and labels, wallpaper, solar cells, fuel cells, and batteries are major driving factors for the industry...
October 15, 2018: Carbohydrate Polymers
Jiwen Luo, Weijie Deng, Feng Yang, Zeqi Wu, Mantuo Huang, Mengyuan Gu
A functionalized paper based on gold nanoparticles (Au NPs) conjugated graphene oxide (GO) was developed for near-infrared (NIR) laser triggered photothermal ablation against infectious bacterial pathogens. Firstly, quaternized carboxymethyl chitosan (QCMC) not only acted as reducing agent to synthesize Au NPs, but also functioned as coupling agent to link up Au NPs with GO. Au-QCMC-GO(+) was supposed to synergistically intensify the photothermal effect, which was then mixed with nanocellulose to form a functionalized paper via vacuum filtration...
October 15, 2018: Carbohydrate Polymers
Xiaoming Zhou, Yang Liu, Chunyu Du, Yang Ren, Xiaolong Li, Pengjian Zuo, Geping Yin, Yulin Ma, Xinqun Cheng, Yunzhi Gao
Freely deformable and free-standing electrodes together with high capacity are crucial to realizing flexible Li-ion batteries. Herein, a lamellar graphene/nanocellulose/silicon (GN/NC/Si) film assembled by interpenetrated graphene nanosheets is synthesized via a facile vacuum-assisted filtration approach accompanied by the covalent cross-linking effect of glutaraldehyde. The hybrid film consists of the highly conductive graphene matrix as an effective current collector, hydroxylated silicon nanoparticles (Si NPs) embedded uniformly within graphene interlayer and nanocellulose as adhesive to crosslink graphene and Si NPs...
August 9, 2018: ACS Applied Materials & Interfaces
Jian Zhou, You-Lo Hsieh
Strong and highly conductive aerogels have been assembled from cellulose nanofibrils (CNFs) protonated with conductive poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS) complex at equal mass or less. Protonating CNF surface carboxylates and hydrogen-bonding CNF surface carboxyls with PSS in PEDOT/PSS generated PEDOT/PSS/CNF aerogels that were up to ten times stronger while as conductive as neat PEDOT/PSS aerogel, attributed to the transformation of PEDOT benzoid structure to the more electron transfer-preferred quinoid structure...
August 9, 2018: ACS Applied Materials & Interfaces
Manali Rathod, Pareshkumar G Moradeeya, Soumya Haldar, Shaik Basha
Nanocellulose (NC)-supported TiO2 nanoparticles, termed NCTs, were prepared by an ultrasonic impregnation method. The as-synthesized NCTs were thoroughly characterized and studied for the photodegradation of mefenamic acid (MEF), an anthranilic acid derivative drug. The adsorption potential of NCTs increased with TiO2 loading and 10 wt% TiO2 NCT showed the highest sorption potential. Adsorption kinetics of MEF onto NC and NCTs indicated that the equilibrium was reached within 50 min. A pseudo-second-order model clearly represented the experimental kinetic data and demonstrated that the MEF sorption was mainly chemisorption...
August 9, 2018: Photochemical & Photobiological Sciences
Qinqin Ding, Xinwu Xu, Yiying Yue, Changtong Mei, Chaobo Huang, Shaohua Jiang, Qinglin Wu, Jingquan Han
Conducting polymer hydrogels (CPHs) have emerged as a fascinating class of smart soft matters important for various advanced applications. However, achieving the synergistic characteristics of conductivity, self-healing ability, biocompatibility, viscoelasticity, and high mechanical performance still remains a critical challenge. Here, we develop for the first time a type of multifunctional hybrid CPHs based on a viscoelastic polyvinyl alcohol (PVA)-borax (PB) gel matrix and nanostructured CNFs-PPy (cellulose nanofibers-polypyrrole) complexes that synergizes the biotemplate role of CNFs and the conductive nature of PPy...
August 7, 2018: ACS Applied Materials & Interfaces
Alex Basu, Maria Strømme, Natalia Ferraz
A Ca2+ -crosslinked wood-based nanofibrillated cellulose (NFC) hydrogel was investigated to build knowledge toward the use of nanocellulose for topical drug delivery applications in a chronic wound healing context. Proteins of varying size and isoelectric point were loaded into the hydrogel in a simple soaking procedure. The release of the proteins from the hydrogel was monitored and kinetics determining parameters of the release processes were assessed. The integrity of the hydrogel and proteins were also studied...
July 20, 2018: Nanomaterials
Reidun C Aadland, Carter J Dziuba, Ellinor B Heggset, Kristin Syverud, Ole Torsæter, Torleif Holt, Ian D Gates, Steven L Bryant
The application of nanotechnology to the petroleum industry has sparked recent interest in increasing oil recovery, while reducing environmental impact. Nanocellulose is an emerging nanoparticle that is derived from trees or waste stream from wood and fiber industries. Thus, it is taken from a renewable and sustainable source, and could therefore serve as a good alternative to current Enhanced Oil Recovery (EOR) technologies. However, before nanocellulose can be applied as an EOR technique, further understanding of its transport behavior and retention in porous media is required...
July 19, 2018: Nanomaterials
J Vincent Edwards, Krystal R Fontenot, Falk Liebner, Brian D Condon
The growing incidence of chronic wounds in the world population has prompted increased interest in chronic wound dressings with protease-modulating activity and protease point of care sensors to treat and enable monitoring of elevated protease-based wound pathology. However, the overall design features needed for the combination of a chronic wound dressing that lowers protease activity along with protease detection capability as a single platform for semi-occlusive dressings has scarcely been addressed. The interface of dressing and sensor specific properties (porosity, permeability, moisture uptake properties, specific surface area, surface charge, and detection) relative to sensor bioactivity and protease sequestrant performance is explored here...
July 18, 2018: Sensors
Ragab E Abouzeid, Ramzi Khiari, Nahla El-Wakil, Alain Dufresne
Nanotechnology has been identified as having great potential for improving the efficiency of water prevention and purification while reducing costs. In this field, two applications of nanocellulose have generated attention and have proven to be a sound strategy as an adsorbent and as a membrane for the removal of contaminants. This potential is attributed to its high aspect ratio, high specific surface area, high capacity retention, and environmental inertness. In addition to the aforementioned advantages, the presence of active sites allows the incorporation of chemical moieties that may enhance the binding efficiency of pollutants to the surface...
August 6, 2018: Biomacromolecules
Thennakoon M Sampath Udeni Gunathilake, Yern Chee Ching, Cheng Hock Chuah, Hazlee Azil Illias, Kuan Yong Ching, Ramesh Singh, Liou Nai-Shang
Nanocellulose reinforced chitosan hydrogel was synthesized using chemical crosslinking method for the delivery of curcumin which is a poorly water-soluble drug. Curcumin extracted from the dried rhizomes of Curcuma longa was incorporated to the hydrogel via in situ loading method. A nonionic surfactant (Tween 20) was incorporated into the hydrogel to improve the solubility of curcumin. After the gas foaming process, hydrogel showed large interconnected pore structures. The release studies in gastric medium showed that the cumulative release of curcumin increased from 0...
July 2, 2018: International Journal of Biological Macromolecules
Carlos Adelantado, Ángel Ríos, Mohammed Zougagh
A simple and rapid microextraction procedure is reported on the use of ionic liquid in combination with magnetic nanocellulose hybrid nanoparticles. The procedure is ultrasound-assisted and applicable to selective preconcentration of neonicotinoid insecticides from milk samples, prior to being analysed by liquid chromatography-mass spectrometry. The extraction procedure uses small volume of organic solvents (<1 mL), and there is no need for centrifugation. In the experimental approach the ionic liquid was quickly disrupted by an ultrasonic probe and dispersed in milk samples in a cloudy form...
July 26, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Yendry R Corrales-Ureña, Carlos Villalobos-Bermúdez, Reinaldo Pereira, Melissa Camacho, Eugenia Estrada, Orlando Argüello-Miranda, Jose R Vega-Baudrit
Silica in plant tissues has been suggested as a component for enhancing mechanical properties, and as a physical barrier. Pineapples present in their shell and bracts rosette-like microparticles that could be associated to biogenic silica. In this study, we show for the first time that silica-based microparticles are co-purified during the extraction process of nanocellulose from pineapple (Ananas comosus). This shows that vegetable biomass could be an underappreciated source, not only for nanocellulose, but also for a highly valuable sub-product, like 10 µm biogenic rosette-like silica-based microparticles...
July 10, 2018: Scientific Reports
Kaisa Marjamaa, Kristiina Kruus
Lignocelluloses are abundant raw materials for production of fuels, chemicals and materials. The purpose of this paper is to review the enzyme-types and enzyme-technologies studied and applied in the processing of the lignocelluloses into different products. The enzymes here are mostly glycoside hydrolases, esterases and different redox enzymes. Enzymatic hydrolysis of lignocellulosic polysaccharides to platform sugars has been widely studied leading to development of advanced commercial products for this purpose...
July 10, 2018: Physiologia Plantarum
Sanna Hokkanen, Amit Bhatnagar, Varsha Srivastava, Valtteri Suorsa, Mika Sillanpää
A novel hydroxyapatite-bentonite clay-nanocellulose (CHA-BENT-NCC) composite material was successfully prepared as adsorbent for the removal of Ni2+ , Cd2+ and PO4 3- from aqueous solutions. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive analysis of X-rays (EDAX), X-ray diffraction analysis (XRD) and Fourier-transform infrared spectroscopy (FTIR) were used for characterization of the adsorbent. The effect of pH, contact time, temperature, and initial adsorbate concentration were studied for optimization purpose...
June 30, 2018: International Journal of Biological Macromolecules
Ningning Yang, Wenwen Zhang, Chao Ye, Xue Chen, Shengjie Ling
Living organisms produced nanopolymers (nanobiopolymers for short), such as nanocellulose, nanochitin, nanosilk, nanostarch, and microbial nanobiopolymers, having received widely scientific and engineering interests in recent years. Compare with petroleum-based polymers, biopolymers are sustainable and biodegradable. The unique structural features that stem from nanosized effects, such as ultrahigh aspect ratio and length-diameter ratio, further endow nanobiopolymers with high transparence and versatile processability...
June 28, 2018: Biotechnology Journal
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