Bottom-up assembly of nanocellulose structures

Niinivaara, Elina; Cranston, Emily D.

doi:10.1016/j.carbpol.2020.116664

Cited by 53 publications

(39 citation statements)

References 259 publications

(417 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dilution series enabled monitoring of latex particle coalescence within the films with increasing solids content. Spin coating was implemented for film preparation as it enables the preparation of smooth, highly reproducible films, unlike other film preparation techniques such as drop casting [65].…”

Section: Methodsmentioning

confidence: 99%

How latex film formation and adhesion at the nanoscale correlate to performance of pressure sensitive adhesives with cellulose nanocrystals

Niinivaara

Ouzas

Fraschini

et al. 2021

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

Emulsion polymerized latex-based pressure-sensitive adhesives (PSAs) are more environmentally benign because they are synthesized in water but often underperform compared to their solution polymerized counterparts. Studies have shown a simultaneous improvement in the tack, and peel and shear strength of various acrylic PSAs upon the addition of cellulose nanocrystals (CNCs). This work uses atomic force microscopy (AFM) to examine the role of CNCs in (i) the coalescence of hydrophobic 2-ethyl hexyl acrylate/ n -butyl acrylate/methyl methacrylate (EHA/BA/MMA) latex films and (ii) as adhesion modifiers over multiple length scales. Thin films with varying solids content and CNC loading were prepared by spin coating. AFM revealed that CNCs lowered the solids content threshold for latex particle coalescence during film formation. This improved the cohesive strength of the films, which was directly reflected in the increased shear strength of the EHA/BA/MMA PSAs with increasing CNC loading. Colloidal probe AFM indicated that the nano-adhesion of thicker continuous latex films increased with CNC loading when measured over small contact areas where the effect of surface roughness was negligible. Conversely, the beneficial effects of the CNCs on macroscopic PSA tack and peel strength were outweighed by the effects of increased surface roughness with increasing CNC loading over larger surface areas. This highlights that CNCs can improve both cohesive and adhesive PSA properties; however, the effects are most pronounced when the CNCs interact favourably with the latex polymer and are uniformly dispersed throughout the adhesive film. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 1)’.

show abstract

Section: Methodsmentioning

confidence: 99%

How latex film formation and adhesion at the nanoscale correlate to performance of pressure sensitive adhesives with cellulose nanocrystals

Niinivaara

Ouzas

Fraschini

et al. 2021

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, hydrogel sensors that can monitor biophysical, boichemical, and surrounding environment status of the human body and transduce them into analytical signals with skin sensing capability have gained tremendous attention. − In particular, wearable hydrogel sensors are gaining popularity in artificial intelligence and healthcare-monitoring systems by virtue of superior mechanical performance and effective signal transduction. − Wearable hydrogel strain sensors, as a vital branch of wearable sensor devices, are capable of converting mechanical deformations into electrical signals and have attracted numerous attention in fields as varied as human motion detecting, personalized health-monitoring, electronic skins, human–machine interfaces, and soft robotics. − Highly sensitive wearable hydrogel pressure sensors seamlessly integrated with soft and curved biological tissues/organs can respond to the applied pressure by generating electrical signals, which are needed for several potential applications including artificial smart systems and physiological parameters capturing. − Additionally, flexible and wearable temperature sensors can be used for the continuous and real-time detection of the body, thereby contributing to early disease detection and monitoring. , Electrophysiological sensors with high skin conformability can achieve significant health information recording via visualizing bodily electrical signals into diagrams including electroencephalography (EEG), electromyography (EMG), electrocardiography (ECG), and electrooculography (EOG). ,,, Furthermore, multifunctional wearable sensors can simultaneously detect multiple physiological parameters (e.g., body motions and temperature, physical, respiratory rate, humidity, heart rate) and environmental variations (e.g., gas and light) in our daily activities, which play unique roles in human health-care and surrounding environment monitoring. , …”

Section: Performance Metrics and Sensing Approaches Of Hydrogel Sensorsmentioning

confidence: 99%

Recent Progress in Natural Biopolymers Conductive Hydrogels for Flexible Wearable Sensors and Energy Devices: Materials, Structures, and Performance

Cui

Meng

et al. 2020

ACS Appl. Bio Mater.

223

149

View full text Add to dashboard Cite

Natural biopolymer-based conductive hydrogels, which combine inherent renewable, nontoxic features, biocompatibility and biodegradability of biopolymers, and excellent flexibility and conductivity of conductive hydrogels, exhibit great potential in applications of wearable and stretchable sensing devices. Compared to traditional flexible substrates deriving from petro-materials-derived polymers, conductive hydrogels consisting of continuous cross-linked polymer networks and a large amount of water exhibit more fantastic combination of stretchability and conductivity because their polymer networks endow the hydrogels with mechanical flexibility and the water offers them a consecutive ionic transport property. Different from petro-materials-derived polymers, biopolymers that are extracted from bioresource with intrinsic biocompatibility and biodegradability are commonly considered as appropriate candidates for constructing wearable devices. For example, biopolymers such as cellulose, chitosan, and silk fibroin are usually chosen as promising candidates to construct conductive hydrogels, endowing the hydrogels with enhanced mechanical properties and remarkable biocompatibility. This review summarizes the recent progress of natural biopolymer-based conductive hydrogels that are utilized for electrical sensing devices with a series of typical biopolymers including cellulose, chitosan, silk fibroin, and gelatin. The chemical structures and physicochemical properties of the four typical biopolymers are demonstrated, and their applications in diverse conductive hydrogel sensors are discussed in detail. Finally, the remaining challenges and expectations are discussed.

show abstract

“…Many reports have proved that appropriate rough morphology and low surface energy are indispensable to fabricate superhydrophobic materials [ 16 , 17 , 18 ]. A bottom-up assembly process is commonly used for the preparation of superhydrophobic aerogels [ 19 , 20 ]. So far, a variety of superhydrophobic aerogels have been developed, including silica-based aerogels [ 21 , 22 ], carbon-based aerogels [ 23 , 24 , 25 , 26 ], cellulose-based aerogels [ 27 , 28 , 29 , 30 , 31 , 32 ], and boron nitride aerogels [ 33 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Superhydrophobic Cross-Linked Nanocellulose Aerogels for Oil–Water Separation

et al. 2021

View full text Add to dashboard Cite

A facile and environmental-friendly approach was developed for the preparation of the cross-linked nanocellulose aerogel through the freeze-drying process and subsequent esterification. The as-prepared aerogel had a three-dimensional cellular microstructure with ultra-low density of 6.05 mg·cm−3 and high porosity (99.61%). After modifying by chemical vapor deposition (CVD) with hexadecyltrimethoxysilane (HTMS), the nanocellulose aerogel displayed stable super-hydrophobicity and super-oleophilicity with water contact angle of 151°, and had excellent adsorption performance for various oil and organic solvents with the adsorption capacity of 77~226 g/g. Even after 30 cycles, the adsorption capacity of the nanocellulose aerogel for chloroform was as high as 170 g/g, indicating its outstanding reusability. Therefore, the superhydrophobic cross-linked nanocellulose aerogel is a promising oil adsorbent for wastewater treatment.

show abstract

Bottom-up assembly of nanocellulose structures

Cited by 53 publications

References 259 publications

How latex film formation and adhesion at the nanoscale correlate to performance of pressure sensitive adhesives with cellulose nanocrystals

How latex film formation and adhesion at the nanoscale correlate to performance of pressure sensitive adhesives with cellulose nanocrystals

Recent Progress in Natural Biopolymers Conductive Hydrogels for Flexible Wearable Sensors and Energy Devices: Materials, Structures, and Performance

Facile Fabrication of Superhydrophobic Cross-Linked Nanocellulose Aerogels for Oil–Water Separation

Contact Info

Product

Resources

About