139 results match your criteria cncs modified


Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface-Modified Cellulose Nanocrystals.

Angew Chem Int Ed Engl 2021 May 4. Epub 2021 May 4.

Kent State University, Advanced Maerials and Liquid Crystal Institute, 44242, Kent, UNITED STATES.

The vast majority of nanomaterials studied in light of their ability to transmit chirality to or amplify their chirality in a surrounding medium, constitute an achiral core with chirality solely installed at the surface by conjugation or encapsulation with optically active ligands. Here we present the inverse approach focusing on surface-modified cellulose nanocrystals (CNCs) with core chirality at both the molecular and the morphological level to quantify transmission and amplification of core chirality through space using a host nematic liquid crystal (N- LC) as reporter. We find that CNCs functionalized at the surface with achiral molecules, structurally related to the N-LC, exhibit better N-LC solubility, thereby serving as highly efficient chiral inducers. Read More

View Article and Full-Text PDF

Novel chitosan-ulvan hydrogel reinforcement by cellulose nanocrystals with epidermal growth factor for enhanced wound healing: In vitro and in vivo analysis.

Int J Biol Macromol 2021 Apr 28;183:435-446. Epub 2021 Apr 28.

College of Marine Life Science, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, Shandong, China. Electronic address:

Several dressing materials can be used efficiently in recent times, both in their natural and synthetic combinations like; microfibers, film, nanofibers, hydrogels, and various drugs. The specific characteristics, such as biocompatibility and providing a favorable environment for wound healing, make many polysaccharides pivotal as wound dressings. Keeping in view the importance of these polysaccharides, we have developed novel chitosan-ulvan hydrogel incorporated by cellulose nanocrystals (CNCs) loading epidermal growth factor (EGF) drug (CS-U-CNC-EGF) by the freeze-dried process. Read More

View Article and Full-Text PDF

Microwave-assisted assembly of AgO-ZnO composite nanocones for electrochemical detection of 4-Nitrophenol and assessment of their photocatalytic activity towards degradation of 4-Nitrophenol and Methylene blue dye.

J Hazard Mater 2021 Mar 27;416:125771. Epub 2021 Mar 27.

Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University Chandigarh, 160014, India; SAIF/CIL, Panjab University Chandigarh, 160014, India. Electronic address:

4-Nitrophenol (4-NP) is an extensively utilized industrial chemical and one of major toxic water pollutant. Therefore, there is an urgent need to monitor the levels of 4-NP from environmental samples as well as its eradication are extremely important. Keeping this as a motivation, this research for the first-time reports microwave-assisted cost-effective synthesis of silver oxide (AgO)-zinc oxide (ZnO) composite nanocones (CNCs, 80-100 nm) for simultaneous electrochemical detection and photodegradation of 4-NP from aqueous solutions. Read More

View Article and Full-Text PDF

A review on the emerging applications of cellulose, cellulose derivatives and nanocellulose in carbon capture.

Environ Res 2021 Apr 1;197:111100. Epub 2021 Apr 1.

Faculty of Environment and Labour Safety, Ton Duc Thang University, 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7, Ho Chi Minh City, Vietnam; School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, Malaysia. Electronic address:

Carbon capture can be implemented at a large scale only if the CO selective materials are abundantly available at low cost. Since the sustainable requirement also elevated, the low-cost and biodegradable cellulosic materials are developed into CO selective adsorbent and membranes recently. The applications of cellulose, cellulosic derivatives and nanocellulose as CO selective adsorbents and membranes are reviewed here. Read More

View Article and Full-Text PDF

Construction of Nanocrystalline Cellulose-Based Composite Fiber Films with Excellent Porosity Performances via an Electrospinning Strategy.

ACS Omega 2021 Feb 11;6(7):4958-4967. Epub 2021 Feb 11.

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P. R. China.

Cellulose nanocrystals (CNCs) not only have environmental protection characteristics of being lightweight, degradable, green, and renewable but also have some nanocharacteristics of high strength, large specific surface area, and obvious small size effect, so they are often used as a reinforcing agent in various polymers. However, the hydrogen bonding between CNC molecules is relatively strong, and they can easily aggregate and get entangled with each other. In this work, several large-porosity composite nanofiber films, KH550-CNC/waterborne polyurethane (WPU)/poly(vinyl alcohol) (PVAL) with KH550-modified CNCs, are prepared using poly(vinyl alcohol) (PVAL) solution and electrospinning technology. Read More

View Article and Full-Text PDF
February 2021

Nanocellulose/Fullerene Hybrid Films Assembled at the Air/Water Interface as Promising Functional Materials for Photo-electrocatalysis.

Polymers (Basel) 2021 Jan 12;13(2). Epub 2021 Jan 12.

Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy.

Cellulose nanomaterials have been widely investigated in the last decade, unveiling attractive properties for emerging applications. The ability of sulfated cellulose nanocrystals (CNCs) to guide the supramolecular organization of amphiphilic fullerene derivatives at the air/water interface has been recently highlighted. Here, we further investigated the assembly of Langmuir hybrid films that are based on the electrostatic interaction between cationic fulleropyrrolidines deposited at the air/water interface and anionic CNCs dispersed in the subphase, assessing the influence of additional negatively charged species that are dissolved in the water phase. Read More

View Article and Full-Text PDF
January 2021

Polymer-Decorated Cellulose Nanocrystals as Environmentally Friendly Additives for Olefin-Based Drilling Fluids.

Int J Mol Sci 2020 Dec 31;22(1). Epub 2020 Dec 31.

Laboratório de Pesquisa em Petróleo, Universidade Federal do Rio Grande do Norte, Natal, RN 59078-970, Brazil.

In this study, we intended to evaluate the performance of olefin-based drilling fluids after addition of cellulose nanocrystal (CNC) derivatives. For this purpose, firstly, cellulose nanocrystals, produced from sulfuric acid hydrolysis of cotton fibers, were functionalized with poly(-isopropylacrylamide) (PNIPAM) chains via free radicals. The samples were then characterized via Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), confocal microscopy, dynamic light scattering (DLS), and zeta potential measurements in water. Read More

View Article and Full-Text PDF
December 2020

Acrylic Functionalization of Cellulose Nanocrystals with 2-Isocyanatoethyl Methacrylate and Formation of Composites with Poly(methyl methacrylate).

ACS Omega 2020 Dec 20;5(48):31092-31099. Epub 2020 Nov 20.

School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Cellulose nanocrystals (CNCs) derived from renewable plant-based materials exhibit strong potential for improving properties of polymers by their dispersal in the polymer matrix as a composite phase. However, the hydrophilicity and low thermal stability of CNCs lead to compromised particle dispersibility in common polymers and limit the processing conditions of polymer-CNC composites, respectively. One route that has been explored is the modification of CNCs to alter surface chemistry. Read More

View Article and Full-Text PDF
December 2020

Functionalized Cellulose Nanocrystals for Cellular Labeling and Bioimaging.

Biomacromolecules 2021 02 7;22(2):454-466. Epub 2020 Dec 7.

Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany.

Cellulose nanocrystals (CNCs) are unique and promising natural nanomaterials that can be extracted from native cellulose fibers by acid hydrolysis. In this study, we developed chemically modified CNC derivatives by covalent tethering of PEGylated biotin and perylenediimide (PDI)-based near-infrared organic dye and evaluated their suitability for labeling and imaging of different cell lines including J774A.1 macrophages, NIH-3T3 fibroblasts, HeLa adenocarcinoma cells, and primary murine dendritic cells. Read More

View Article and Full-Text PDF
February 2021

Surface Modification of Cellulose Nanocrystals via RAFT Polymerization of CO-Responsive Monomer-Tuning Hydrophobicity.

Langmuir 2020 Nov 13;36(46):13989-13997. Epub 2020 Nov 13.

Department of Chemical Engineering, Queen's University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada.

Cellulose nanocrystals (CNCs) were converted into a CO-responsive composite nanomaterial by grafting poly(dimethylaminoethyl methacrylate) (PDMAEMA), poly(diethylaminoethyl methacrylate) (PDEAEMA), and poly(diisopropylaminoethyl methacrylate) (PDPAEMA) onto its surface using both grafting-to and grafting-from approaches. The zeta potential (ζ) of the graft-modified CNC could be reversibly switched by protonation/deprotonation of the tertiary amine groups simply by sparging with CO and N, respectively. Depending on the grafting density and the molecular weight of the polymer grafts, CNC can form stable aqueous dispersions at either mildly acidic pH (under CO) or mildly basic (under N) conditions. Read More

View Article and Full-Text PDF
November 2020

Particle-stabilized oil-in-water emulsions as a platform for topical lipophilic drug delivery.

Colloids Surf B Biointerfaces 2021 Jan 18;197:111423. Epub 2020 Oct 18.

ORDIST, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka, 564-0836, Japan; Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka, 564-0836, Japan. Electronic address:

Low-environmental-impact emulsion systems for transdermal drug delivery in topical treatment have gained increasing interest. However, low stability and adverse systemic side effects severely decrease their efficiency. This study proposed a stable oil-in-water (O/W) emulsion loaded with bifonazole (BFZ) as a lipophilic drug stabilized by poly(2-isopropoxy-2-oxo-1,3,2-dioxaphospholane)-modified cellulose nanocrystals (CNC-g-PIPP) as vehicles for topical delivery of lipophilic drugs. Read More

View Article and Full-Text PDF
January 2021

High-Barrier and Antioxidant Poly(lactic acid)/Nanocellulose Multilayered Materials for Packaging.

ACS Omega 2020 Sep 31;5(36):22816-22826. Epub 2020 Aug 31.

LGP2, Grenoble INP, Université Grenoble Alpes, CNRS, F-38000 Grenoble, France.

In the current context, the development of bio-based and high-performance materials is one of the main research priorities. This study aims to combine the outstanding properties of cellulose nanofibrils (CNFs) or nanocrystals (CNCs) with those of bio-based poly(lactic acid) (PLA). Three-phase multilayered materials (TMLs) were built up by complexing a dry CNF- or CNC-based film with two PLA sheets, using a heat-pressing process. Read More

View Article and Full-Text PDF
September 2020

Screen-Printed Glucose Sensors Modified with Cellulose Nanocrystals (CNCs) for Cell Culture Monitoring.

Biosensors (Basel) 2020 Sep 13;10(9). Epub 2020 Sep 13.

Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland.

Glucose sensors are potentially useful tools for monitoring the glucose concentration in cell culture medium. Here, we present a new, low-cost, and reproducible sensor based on a cellulose-based material, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized-cellulose nanocrystals (CNCs). This novel biocompatible and inert nanomaterial is employed as a polymeric matrix to immobilize and stabilize glucose oxidase in the fabrication of a reproducible, operationally stable, highly selective, cost-effective, screen-printed glucose sensor. Read More

View Article and Full-Text PDF
September 2020

Cationic cellulose nanocrystals complexed with polymeric siRNA for efficient anticancer drug delivery.

Carbohydr Polym 2020 Nov 25;247:116684. Epub 2020 Jun 25.

Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea. Electronic address:

Surface-modified cellulose nanocrystals (CNCs) were developed for efficient delivery of polymeric siRNA in cancer cells. Cationic CNCs were synthesized using the sequential process of hydrothermal desulfation and chemical modification following which, polymeric siRNA obtained using from a two-step process of rolling circle transcription and Mg chelation was complexed with the modified CNCs by electrostatic interaction. The complexation efficiency was optimized for high drug loading and release in the cytoplasmic environment. Read More

View Article and Full-Text PDF
November 2020

Ionic Liquids Grafted Cellulose Nanocrystals for High-Strength and Toughness PVA Nanocomposite.

ACS Appl Mater Interfaces 2020 Aug 14;12(34):38796-38804. Epub 2020 Aug 14.

Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao 266042, China.

The surface functionalization of cellulose nanocrystals (CNCs) is of significant importance for promoting its diverse applications. However, the efficient strategy reported so far for cation functionalization of CNCs remains limited owing to the electrostatic attraction between cationic modifiers and electronegative CNCs. Herein, a cationized CNC (CNC-LA-IL) has been successfully prepared in aqueous media by grafting the [VBIm][BF], a kind of ionic liquid (IL), on the surface of a sulfated CNC using lactic acid (LA) as a linker molecule. Read More

View Article and Full-Text PDF

High-performance nanofiltration membranes with a sandwiched layer and a surface layer for desalination and environmental pollutant removal.

Sci Total Environ 2020 Nov 6;743:140766. Epub 2020 Jul 6.

State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address:

To overcome the permeability-selectivity limitation and improve the performance of desalination membranes, novel methods and design strategies are needed to prepare new types of thin film composite (TFC) nanofiltration (NF) membranes. In this work, a modified TFC membrane with a sandwiched layer and a surface layer was fabricated through a facile additional two-step approach. The microfiltration (MF) substrate and TFC surface were modified by a cellulose nanocrystal (CNC) sandwiched layer and a polydopamine (PDA) layer, respectively. Read More

View Article and Full-Text PDF
November 2020

Theoretical Rationalization of Self-Assembly of Cellulose Nanocrystals: Effect of Surface Modifications and Counterions.

Biomacromolecules 2020 08 14;21(8):3069-3080. Epub 2020 Jul 14.

Laboratory of Organic Electronics, Department of Science and Technology (ITN), Campus Norrköping, Linköping University, Norrköping SE-60174, Sweden.

The hierarchical self-assembly of cellulose nanocrystals (CNCs) is an important phenomenon occurring naturally in plant cell walls. Utilization of this assembly for advanced applications requires a fundamental theoretical understanding of interactions between the CNCs, which is still incomplete. Hence, in this work, we used molecular dynamics simulations to study the effect of surface modification on the interactions between the CNCs and the resulting bundling process. Read More

View Article and Full-Text PDF

Stone Paper as a New Substrate to Fabricate Flexible Screen-Printed Electrodes for the Electrochemical Detection of Dopamine.

Sensors (Basel) 2020 Jun 26;20(12). Epub 2020 Jun 26.

National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, RO, 400293 Cluj-Napoca, Romania.

Flexible screen-printed electrodes (HP) were fabricated on stone paper substrate and amperometrically modified with gold nanoparticles (HP-AuNPs). The modified electrode displayed improved electronic transport properties, reflected in a low charge-transfer resistance (1220 Ω) and high apparent heterogeneous electron transfer rate constant (1.94 × 10 cm/s). Read More

View Article and Full-Text PDF

Cellulose Mediated Transferrin Nanocages for Enumeration of Circulating Tumor Cells for Head and Neck Cancer.

Sci Rep 2020 06 19;10(1):10010. Epub 2020 Jun 19.

Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, 58108, ND, USA.

Herein we report a hierarchically organized, water-dispersible 'nanocage' composed of cellulose nanocrystals (CNCs), which are magnetically powered by iron oxide (FeO) nanoparticles (NPs) to capture circulating tumor cells (CTCs) in blood for head and neck cancer (HNC) patients. Capturing CTCs from peripheral blood is extremely challenging due to their low abundance and its account is clinically validated in progression-free survival of patients with HNC. Engaging multiple hydroxyl groups along the molecular backbone of CNC, we co-ordinated FeO NPs onto CNC scaffold, which was further modified by conjugation with a protein - transferrin (Tf) for targeted capture of CTCs. Read More

View Article and Full-Text PDF

Carbodiimide coupling versus click chemistry for nanoparticle surface functionalization: A comparative study for the encapsulation of sodium cholate by cellulose nanocrystals modified with β-cyclodextrin.

Carbohydr Polym 2020 Sep 29;244:116512. Epub 2020 May 29.

Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada. Electronic address:

Grafting beta-cyclodextrin (β-CD) onto cellulose nanocrystals (CNC) with the formation of well-dispersed nanoparticles (CNC-CD) and understanding their physicochemical properties are appealing but still challenging in controlled-release applications. Two immobilization methods were proposed and examined in this study; (i) copper (I) catalyzed click chemistry (CuACC) and (ii) carbodiimide coupling. Fourier-transform infrared spectroscopy (FTIR), UV-vis, elementary analysis, contact angle measurements, and thermogravimetric analysis (TGA) were conducted to elucidate the surface modifications. Read More

View Article and Full-Text PDF
September 2020

Polymerization of cellulose nanocrystals-based Pickering HIPE towards green porous materials.

Carbohydr Polym 2020 Sep 15;243:116411. Epub 2020 May 15.

Laboratoire de Chimie des Polymères Organiques, Univ. Bordeaux, CNRS, Bordeaux INP, UMR 5629, Bordeaux, 16 Avenue Pey-Berland, F-33607, Pessac, France. Electronic address:

Porous materials were produced based on high internal phase emulsions (HIPE) formulation stabilized by modified cellulose nanocrystals (CNCs). CNCs were first modified with bromoisobutyryl bromide and used as Pickering emulsion stabilizers to formulate highly concentrated inverse emulsions. Solid foams with an open porosity were successively produced by free radical polymerization of styrene/divinylbenzene continuous phase. Read More

View Article and Full-Text PDF
September 2020

Self-propelled cellulose nanocrystal based catalytic nanomotors for targeted hyperthermia and pollutant remediation applications.

Int J Biol Macromol 2020 Apr 28;158:1020-1036. Epub 2020 Apr 28.

Department of Chemical Engineering, Indian Institute of Technology, Guwahati, Assam 781039, India. Electronic address:

Inspired from biological motors, cellulose nanocrystals (CNCs) are strategically modified to induce self-propulsion behavior with the capabilities to catalytically degrade pollutants along with magnetic hyperthermia to clean arterial plaques during its course of propulsion. CNCs derived from renewable biomass, are decorated with catalytically active, magneto-responsive nanomaterials (FeO/Pd nanoparticles) through sustainable routes. CNC nanomotors show improved propulsion at lowered peroxide concentrations with remotely controlled trajectory through chemo-magnetic field gradients and ideal surface-wettability characteristics, overcoming the requirement of surfactants, as with traditional nanomotors. Read More

View Article and Full-Text PDF

Influence of Free Volume Determined by Positron Annihilation Lifetime Spectroscopy (PALS) on Gas Permeability of Cellulose Nanocrystal Films.

ACS Appl Mater Interfaces 2020 May 15;12(21):24380-24389. Epub 2020 May 15.

School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States.

Cellulose nanocrystals (CNCs) are of increasing interest for packaging applications because of their biodegradability, low cost, high crystallinity, and high aspect ratio. The objective of this study was to use positron annihilation lifetime spectroscopy (PALS) to investigate the free volume of CNC films with different structural arrangements (chiral nematic vs shear-oriented CNC films) and relate this information to gas barrier performance. It was found that sheared CNC films with higher CNC alignment have lower free volume and hence have more tortuosity than chiral nematic self-assembled films, which lowers gas diffusion throughout the films. Read More

View Article and Full-Text PDF

Cellulose Nanocrystal Reinforced Collagen-Based Nanocomposite Hydrogel with Self-Healing and Stress-Relaxation Properties for Cell Delivery.

Biomacromolecules 2020 06 11;21(6):2400-2408. Epub 2020 May 11.

National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.

While injectable cross-linking collagen hydrogels offer great potential for applying stem cell therapy to regenerate articular cartilage minimally invasive procedures, the encapsulated cells experience high shear stress during injection, which results in limited cell survival. In this study, surface-modified cellulose nanocrystals (CNCs) have been investigated as green and biocompatible reinforcing agents for collagen hydrogel. Aldehyde-functionalized CNCs (a-CNCs) were produced through a facile one-pot oxidation. Read More

View Article and Full-Text PDF

Selective Detection of Folic Acid Using 3D Polymeric Structures of 3-Carboxylic Polypyrrole.

Sensors (Basel) 2020 Apr 18;20(8). Epub 2020 Apr 18.

Analytical Chemistry Department, Faculty of Pharmacy, Iuliu Haţieganu University of Medicine and Pharmacy, 4 Louis Pasteur St., 400349 Cluj-Napoca, Romania.

The detection of folic acid in biological samples or pharmaceutical products is of great importance due to its implications in the biological functions of the human body, along with the development and growth of the fetus. The deficiency of folic acid can be reversed by the intake of different pharmaceutical formulations or alimentary products fortified with this molecule. The elaboration of sensing platforms represents a continuous work in progress, a task in which the use of conductive polymers modified with different functionalities represents one of the outcoming strategies. Read More

View Article and Full-Text PDF

An injectable chitosan-based hydrogel scaffold containing gold nanoparticles for tissue engineering applications.

Int J Biol Macromol 2020 Jul 14;154:198-205. Epub 2020 Mar 14.

Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. Electronic address:

Scaffolds of tissue engineering for particular sites, for example, nerve, cardiac, and bone tissues, require a comprehensive design of 3D biomaterials that covers all aspects of physical structures and chemical composition, needed for desired cell regeneration. Injectable and in situ forming hydrogel scaffolds, possessing highly hydrated and interconnected structures, have demonstrated several advantages for use in regenerative medicine. In this study, we have developed a new design of injectable hydrogels based on collagen, aldehyde modified-nanocrystalline cellulose, and chitosan loaded with gold nanoparticles (Collagen/ADH-CNCs/CS-Au). Read More

View Article and Full-Text PDF

Improving Electrochemical Properties of Polypyrrole Coatings by Graphene Oxide and Carbon Nanotubes.

Nanomaterials (Basel) 2020 Mar 11;10(3). Epub 2020 Mar 11.

Institute of Materials Technology, Universitat Politècnica de València, 46022 Valencia, Spain.

Nanostructured polypyrrole coating was applied on carbon paper via simple dip-coating and electrochemical approach. Hybridization with nanocarbon materials (graphene oxide (GO) and multi-walled carbon nanotubes (MWCNTs)) and their effect as an anchoring hybrid layer for the growth of polypyrrole towards improving electrochemical properties are studied. The loading of each component and their ratio were evaluated. Read More

View Article and Full-Text PDF

Interphase Design of Cellulose Nanocrystals/Poly(hydroxybutyrate--valerate) Bionanocomposites for Mechanical and Thermal Properties Tuning.

Biomacromolecules 2020 05 4;21(5):1892-1901. Epub 2020 Mar 4.

Department of Industrial and Materials Science, Division of Engineering Materials, Chalmers University of Technology, Hörsalsvägen 7A, SE-412 96 Göteborg, Sweden.

Poly[(3-hydroxybutyrate)--(3-hydroxyvalerate)] (PHBV) is a bacterial polyester with a strong potential as a substitute for oil-based thermoplastics due to its biodegradability and renewability. However, its inherent slow crystallization rate limits its thermomechanical properties and therefore its applications. In this work, surface-modified cellulose nanocrystals (CNCs) have been investigated as green and biosourced nucleating and reinforcing agent for PHBV matrix. Read More

View Article and Full-Text PDF

Reducing end modification on cellulose nanocrystals: strategy, characterization, applications and challenges.

Nanoscale Horiz 2020 03;5(4):607-627

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, P. R. China.

Different from traditional chemical surface modification, localized modification of the reducing end groups of cellulose nanocrystals (CNCs), i.e. the active aldehyde groups, provides new opportunities for diverse functional applications of this renewable nanomaterial without altering its surface chemistry and properties. Read More

View Article and Full-Text PDF

Iridescent Cellulose Nanocrystal Films Modified with Hydroxypropyl Cellulose.

Biomacromolecules 2020 03 26;21(3):1295-1302. Epub 2020 Feb 26.

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.

The introduction of polymers into a chiral nematic cellulose nanocrystal (CNC) matrix allows for the tuning of optical and mechanical properties, enabling the development of responsive photonic materials. In this study, we explored the incorporation of hydroxypropyl cellulose (HPC) into a CNC film prepared by slow evaporation. In the composite CNC/HPC thin films, the CNCs adopt a chiral nematic structure, which can selectively reflect certain wavelengths of light to yield a colored film. Read More

View Article and Full-Text PDF