A carbon aerogel with super mechanical and sensing performances for wearable piezoresistive sensors

2019 ◽  
Vol 7 (14) ◽  
pp. 8092-8100 ◽  
Author(s):  
Hao Zhuo ◽  
Yijie Hu ◽  
Zehong Chen ◽  
Xinwen Peng ◽  
Linxiang Liu ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Carbon Aerogel ◽  
Piezoresistive Sensors ◽  
Mechanical Performances

A compressible carbon aerogel with not only super mechanical performances but also ultrahigh linear sensitivity is fabricated from MXene nanosheets and cellulose nanocrystals (CNCs).

A mechanically strong and sensitive CNT/rGO–CNF carbon aerogel for piezoresistive sensors

2018 ◽  
Vol 6 (46) ◽  
pp. 23550-23559 ◽  
Author(s):  
Xinwen Peng ◽  
Kunze Wu ◽  
Yijie Hu ◽  
Hao Zhuo ◽  
Zehong Chen ◽  
...  
Keyword(s):  
Carbon Aerogel ◽  
Piezoresistive Sensors

A mechanically strong, sensitive and lightweight CNT/rGO–CNF carbon aerogel is fabricated by synergistic assembly of CNFs and CNTs to form ordered wave-shaped rGO layers and reinforcing the carbon layers.

scholarly journals High-Performance Biocomposite Polyvinyl Alcohol (PVA) Films Modified with Cellulose Nanocrystals (CNCs), Tannic Acid (TA), and Chitosan (CS) for Food Packaging

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ruowen Tan ◽  
Feng Li ◽  
You Zhang ◽  
Zihui Yuan ◽  
Xuefei Feng ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Tannic Acid ◽  
Cellulose Nanocrystals ◽  
High Performance ◽  
Food Packaging ◽  
Low Cost ◽  
Antibacterial Properties ◽  
Light Transmittance ◽  
Thermal Stabilities ◽  
Mechanical Performances

Polyvinyl alcohol (PVA) has been widely applied in industries for its low cost, nontoxicity, biodegradability, and renewable advantages. However, its unstable structure may not meet some strong physical and mechanical needs. In order to enhance the performances of the PVA film, cellulose nanocrystals (CNCs), tannic acid (TA), and chitosan (CS), working as a reinforcer, a crosslinker, and an antimicrobial agent, respectively, were introduced into the PVA matrix. The results indicated that CNCs, TA, and CS were evenly distributed and cohesively incorporated within the PVA matrix, which contributed to the good mechanical properties and thermal stabilities of biocomposite PVA films. Besides, the addition of TA remarkably improved the antiultraviolet and antioxidant capabilities of PVA films, although the light transmittance declined slightly. It was also observed that the pure PVA film and PVA reinforced with CNCs were incapable of protecting against bacteria, while the ones with CS had prominent antibacterial properties to Escherichia coli and Staphylococcus aureus. Overall, the resulting film presented a high potential utilization as a food packaging material for its outstanding physical and mechanical performances.

A super-resilient and highly sensitive graphene oxide/cellulose-derived carbon aerogel

2020 ◽  
Vol 8 (35) ◽  
pp. 18376-18384
Author(s):  
Wenzhao Jiang ◽  
Chenfei Yao ◽  
Wei Chen ◽  
Di Li ◽  
Linxin Zhong ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Aerogel ◽  
Highly Sensitive ◽  
Lamellar Texture ◽  
Mechanical Performances

By engineering an ordered lamellar texture and stabilizing the structure during carbonization, an ultralight carbon aerogel with superior mechanical performances and high linear sensitivity is successfully fabricated.

scholarly journals Biodegradable nanocomposite of poly(ester-co-carbonate) and cellulose nanocrystals for tough tear-resistant disposable bags

2021 ◽  
Vol 23 (6) ◽  
pp. 2293-2299
Author(s):  
Hyeri Kim ◽  
Hyeonyeol Jeon ◽  
Giyoung Shin ◽  
Minkyung Lee ◽  
Jonggeon Jegal ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Butylene Succinate ◽  
Mechanical Performances

The “3C-tuning” via chemical designing and nanocompositing upgrades mechanical performances of poly(butylene succinate) to a remarkable level with accelerated biodegradation.

Ambulatory Activity Monitoring

2009 ◽  
Vol 14 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Johannes B.J. Bussmann ◽  
Ulrich W. Ebner-Priemer ◽  
Jochen Fahrenberg
Keyword(s):  
Physical Activity ◽  
Activity Monitoring ◽  
Main Stream ◽  
Computer Algorithms ◽  
Ambulatory Activity ◽  
Physiological Variables ◽  
Piezoresistive Sensors ◽  
Self Reports ◽  
Recent Developments ◽  
Objectively Measured

Behavior is central to psychology in almost any definition. Although observable activity is a core aspect of behavior, assessment strategies have tended to focus on emotional, cognitive, or physiological responses. When physical activity is assessed, it is done so mostly with questionnaires. Converging evidence of only a moderate association between self-reports of physical activity and objectively measured physical activity does raise questions about the validity of these self-reports. Ambulatory activity monitoring, defined as the measurement strategy to assess physical activity, posture, and movement patterns continuously in everyday life, has made major advances over the last decade and has considerable potential for further application in the assessment of observable activity, a core aspect of behavior. With new piezoresistive sensors and advanced computer algorithms, the objective measurement of physical activity, posture, and movement is much more easily achieved and measurement precision has improved tremendously. With this overview, we introduce to the reader some recent developments in ambulatory activity monitoring. We will elucidate the discrepancies between objective and subjective reports of activity, outline recent methodological developments, and offer the reader a framework for developing insight into the state of the art in ambulatory activity-monitoring technology, discuss methodological aspects of time-based design and psychometric properties, and demonstrate recent applications. Although not yet main stream, ambulatory activity monitoring – especially in combination with the simultaneous assessment of emotions, mood, or physiological variables – provides a comprehensive methodology for psychology because of its suitability for explaining behavior in context.

Tuning the Magnetic Alignment of Cellulose Nanocrystals from Perpendicular to Parallel Using Lepidocrocite Nanoparticles

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Sugam Kumar ◽  
Yulia Trushkina ◽  
Gergely Nagy ◽  
Christina Schütz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cellulose Nanocrystals ◽  
Small Angle Neutron Scattering ◽  
Lower Amount ◽  
Magnetic Alignment ◽  
Polarized Optical Microscopy ◽  
Parallel Orientation ◽  
Weak Magnetic Fields

The magnetic alignment of cellulose nanocrystals (CNC) and lepidocrocite nanorods (LpN), pristine and in hybrid suspensions has been investigated using contrast-matched small-angle neutron scattering (SANS) under in situ magnetic fields (0 – 6.8 T) and polarized optical microscopy. The pristine CNC (diamagnetic) and pristine LpN (paramagnetic) align perpendicular and parallel to the direction of field, respectively. The alignment of both the nanoparticles in their hybrid suspensions depends on the relative amount of the two components (CNC and LpN) and strength of the applied magnetic field. In the presence of 10 wt% LpN and fields < 1.0 T, the CNC align parallel to the field. In the hybrid containing lower amount of LpN (1 wt%), the ordering of CNC is partially frustrated in all range of magnetic field. At the same time, the LpN shows both perpendicular and parallel orientation, in the presence of CNC. This study highlights that the natural perpendicular ordering of CNC can be switched to parallel by weak magnetic fields and the incorporation of paramagnetic nanoparticle as LpN, as well it gives a method to influence the orientation of LpN.<br>

Applications of Cellulose Nanocrystals: A Review

2018 ◽  
Author(s):  
Shaoqu Xie ◽  
◽  
Xiao Zhang ◽  
Michael P. Walcott ◽  
Hongfei Lin ◽  
...  
Keyword(s):  
Cellulose Nanocrystals
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