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419 results on '"Nyström, Gustav"'

1. Interlaboratory study of the operational stability of automated sorption balances

Author

Zelinka, Samuel L., Glass, Samuel V., Lazarcik, Eleanor Q. D., Thybring, Emil E., Altgen, Michael, Rautkari, Lauri, Curling, Simon, Cao, Jinzhen, Wang, Yujiao, Künniger, Tina, Nyström, Gustav, Dreimol, Christopher Hubert, Burgert, Ingo, Uyup, Mohd Khairun Anwar, Khadiran, Tumirah, Roper, Mark G., Broom, Darren P., Schwarzkopf, Matthew, Yudhanto, Arief, Subah, Mohammad, Lubineau, Gilles, Fredriksson, Maria, Strojecki, Marcin, Olek, Wiesław, Majka, Jerzy, Pedersen, Nanna Bjerregaard, Burnett, Daniel J., Garcia, Armando R., Verdonck, Els, Dreisbach, Frieder, Waguespack, Louis, Schott, Jennifer, Esteban, Luis G., Garcia-Iruela, Alberto, Colinart, Thibaut, Rémond, Romain, Mazian, Brahim, Perre, Patrick, Emmerich, Lukas, and Li, Ling

Published
2024
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8. Additive Manufacturing of Nanocellulose Aerogels with Structure‐Oriented Thermal, Mechanical, and Biological Properties

Author

Sivaraman, Deeptanshu, primary, Nagel, Yannick, additional, Siqueira, Gilberto, additional, Chansoria, Parth, additional, Avaro, Jonathan, additional, Neels, Antonia, additional, Nyström, Gustav, additional, Sun, Zhaoxia, additional, Wang, Jing, additional, Pan, Zhengyuan, additional, Iglesias‐Mejuto, Ana, additional, Ardao, Inés, additional, García‐González, Carlos A., additional, Li, Mengmeng, additional, Wu, Tingting, additional, Lattuada, Marco, additional, Malfait, Wim J., additional, and Zhao, Shanyu, additional

Published
2024
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10. Stick, Slide, or Bounce: Charge Density Controls Nanoparticle Diffusion

Author

Motezakker, Ahmad Reza, Greca, Luiz G., Boschi, Enrico, Siqueira, Gilberto, Lundell, Fredrik, Rosén, Tomas, Nyström, Gustav, and Söderberg, L. Daniel

Abstract

The diffusion and interaction dynamics of charged nanoparticles (NPs) within charged polymer networks are crucial for understanding various biological and biomedical applications. Using a combination of coarse-grained molecular dynamics simulations and experimental diffusion studies, we investigate the effects of the NP size, relative surface charge density (ζ), and concentration on the NP permeation length and time. We propose a scaling law for the relative diffusion of NPs with respect to concentration and ζ, highlighting how these factors influence the NP movement within the network. The analyses reveal that concentration and ζ significantly affect NP permeation length and time, with ζ being critical, as critical as concentration. This finding is corroborated by controlled release experiments. Further, we categorize NP dynamics into sticking, sliding, and bouncing regimes, demonstrating how variations in ζ, concentration, and NP size control these behaviors. Through normalized attachment time (NAT) analyses, we elucidate the roles of electrostatic interactions, steric hindrance, and hydrodynamic forces in governing NP dynamics. These insights provide guidance for optimizing NP design in targeted drug delivery and advanced material applications, enhancing our understanding of NP behavior in complex environments.

Published
2024
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11. Particle size distributions for cellulose nanocrystals measured by atomic force microscopy: an interlaboratory comparison

Author

Bushell, Michael, Meija, Juris, Chen, Maohui, Batchelor, Warren, Browne, Christine, Cho, Jae-Young, Clifford, Charles A., Al-Rekabi, Zeinab, Vanderfleet, Oriana M., Cranston, Emily D., Lawn, Malcolm, Coleman, Victoria A., Nyström, Gustav, Arcari, Mario, Mezzenga, Raffaele, Park, Byong Chon, Shin, ChaeHo, Ren, Lingling, Bu, Tianjia, Saito, Tsuguyuki, Kaku, Yuto, Wagner, Ryan, and Johnston, Linda J.

Published
2021
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15. Additive manufacturing of silica aerogels

Author

Zhao, Shanyu, Siqueira, Gilberto, Drdova, Sarka, Norris, David, Ubert, Christopher, Bonnin, Anne, Galmarini, Sandra, Ganobjak, Michal, Pan, Zhengyuan, Brunner, Samuel, Nyström, Gustav, Wang, Jing, Koebel, Matthias M., and Malfait, Wim J.

Published
2020
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16. Amyloid fibril-nanocellulose interactions and self-assembly

Author

Kummer, Nico, Giacomin, Caroline, Fischer, Peter, Campioni, Silvia, and Nyström, Gustav

Subjects
Biomaterials, Gelation, Colloid and Surface Chemistry, Amyloid fibrils, Nanocellulose, Colloidal interactions, Self-assembly, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

Amyloid fibrils from inexpensive food proteins and nanocellulose are renewable and biodegradable materials with broad ranging applications, such as water purification, bioplastics and biomaterials. To improve the mechanical properties of hybrid amyloid-nanocellulose materials, their colloidal interactions need to be understood and tuned. A combination of turbidity and zeta potential measurements, rheology and atomic force microscopy point to the importance of electrostatic interactions. These interactions lead to entropy-driven polyelectrolyte complexation for positively charged hen egg white lysozyme (HEWL) amyloids with negatively charged nanocellulose. The complexation increased the elasticity of the amyloid network by cross-linking individual fibrils. Scaling laws suggest different contributions to elasticity depending on nanocellulose morphology: cellulose nanocrystals induce amyloid bundling and network formation, while cellulose nanofibrils contribute to a second network. The contribution of the amyloids to the elasticity of the entire network structure is independent of nanocellulose morphology and agrees with theoretical scaling laws. Finally, strong and almost transparent hybrid amyloid-nanocellulose gels were prepared in a slow self-assembly started from repulsive co-dispersions above the isoelectric point of the amyloids, followed by dialysis to decrease the pH and induce amyloid-nanocellulose attraction and cross-linking. In summary, the gained knowledge on colloidal interactions provides an important basis for the design of functional biohybrid materials based on these two biopolymers., Journal of Colloid and Interface Science, 641, ISSN:0021-9797, ISSN:1095-7103

Published
2023

26. 3D Printed Polyimide Nanocomposite Aerogels for Electromagnetic Interference Shielding and Thermal Management

Author

Wu, Tingting, primary, Ganobjak, Michal, additional, Siqueira, Gilberto, additional, Zeng, Zhihui, additional, Li, Mengmeng, additional, Filimonova, Ekaterina, additional, Saghamanesh, Somayeh, additional, Bonnin, Anne, additional, Sivaraman, Deeptanshu, additional, Yip, Joshua, additional, Li, Lei, additional, Wu, Hui, additional, Nyström, Gustav, additional, Malfait, Wim J., additional, and Zhao, Shanyu, additional

Published
2023
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27. Efficiency assessment of wood and cellulose-based optical elements for terahertz waves

Author

Mavrona, Elena, Hu, Yijie, Siqueira, Gilberto De Freitas, Ruggeberg, Markus, Popov, Sergei, Berglund, Lars, Hack, Erwin, Nyström, Gustav, Zolliker, Peter, Mavrona, Elena, Hu, Yijie, Siqueira, Gilberto De Freitas, Ruggeberg, Markus, Popov, Sergei, Berglund, Lars, Hack, Erwin, Nyström, Gustav, and Zolliker, Peter

Abstract

Polarized THz time domain spectroscopy was used to study the anisotropic properties of wood-based materials for potential optical elements in the THz range, such as half-wave and quarter-wave plates. Wood samples of different species and sample thickness were studied experimentally showing high birefringence but rather high absorption. We elaborate on two approaches to optimize the optical properties for use as wave plates and assess them based on a figure of merit describing their efficiency as a function of birefringence and absorption. The first approach is to dry the wood samples, which significantly improves the efficiency of wave plates. The second approach is the use of artificially produced cellulose samples using 3D printing and freeze drying techniques, which also show birefringence caused by their similar macroscopic cellulose fibre structure. These materials have the potential as cost effective THz elements that are easy to tailor and produce for use at specific frequencies., QC 20230127

Published
2023
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28. The Colloidal Properties of Nanocellulose

Author

Benselfelt, Tobias, Kummer, Nico, Nordenström, Malin, Fall, Andreas B., Nyström, Gustav, Wågberg, Lars, Benselfelt, Tobias, Kummer, Nico, Nordenström, Malin, Fall, Andreas B., Nyström, Gustav, and Wågberg, Lars

Abstract

Nanocelluloses are anisotropic nanoparticles of semicrystalline assemblies of glucan polymers. They have great potential as renewable building blocks in the materials platform of a more sustainable society. As a result, the research on nanocellulose has grown exponentially over the last decades. To fully utilize the properties of nanocelluloses, a fundamental understanding of their colloidal behavior is necessary. As elongated particles with dimensions in a critical nanosize range, their colloidal properties are complex, with several behaviors not covered by classical theories. In this comprehensive Review, we describe the most prominent colloidal behaviors of nanocellulose by combining experimental data and theoretical descriptions. We discuss the preparation and characterization of nanocellulose dispersions, how they form networks at low concentrations, how classical theories cannot describe their behavior, and how they interact with other colloids. We then show examples of how scientists can use this fundamental knowledge to control the assembly of nanocellulose into new materials with exceptional properties. We hope aspiring and established researchers will use this Review as a guide., QC 20230724

Published
2023
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39. Ag-doped cellulose nanofibers for THz wave plates

Author

Mavrona, Elena, Hu, Yijie, Saitzek, Sébastien, Blach, Jean-François, Nyström, Gustav, Zolliker, Peter, Laboratory for Transport at Nanoscale Interfaces, EMPA, Dubendorf, Switzerland, Laboratory for Cellulose and Wood Materials, UCCS Équipe Couches Minces & Nanomatériaux, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
Abstract

International audience

Published
2022

48. Printed Humidity Sensors from Renewable and Biodegradable Materials.

Author

Aeby, Xavier, Bourely, James, Poulin, Alexandre, Siqueira, Gilberto, Nyström, Gustav, and Briand, Danick

Subjects
CAPACITIVE sensors, TEMPERATURE detectors, HUMIDITY, ELECTRONIC waste, DETECTORS, BIODEGRADABLE materials
Abstract

Increasing environmental concerns raised by the accumulation of electronic waste draws attention to the development of sustainable materials for short‐lived electronics. In this framework, printed capacitive humidity sensors and temperature resistive detectors composed exclusively of biodegradable materials: shellac, carbon‐derived particles, and egg‐albumin are reported. The sensor platform comprises interdigitated electrodes serving as a capacitive transducer for humidity sensing, and a serpentine used as a resistive temperature detector. Both the interdigitated and serpentine electrodes are manufactured by screen‐printing carbon ink on a shellac substrate. The humidity sensors are constructed by drop‐coating egg albumin on the interdigitated carbon electrodes and the temperature detector is prepared by encapsulating the serpentine design with shellac. Shellac is shown to be a biodegradable alternative to hydrophilic cellulose‐derived substrates, with the capacitive humidity sensors demonstrating a sensitivity of 0.011% RH−1. The response and recovery times on shellac are 12 and 20 times faster than on cellulose‐based substrate, and the serpentine resistive temperature detectors have a temperature coefficient of 5300 ppm K−1. At the end of their service‐life, the sensors produced are home compostable and can be environmentally friendly disposed, potentially enabling their future use for sustainable and environmentally friendly smart‐packaging, agricultural sensing, or point‐of‐care testing. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Photoresponsive Movement in 3D Printed Cellulose Nanocomposites

Author

Müller, Luca A. E., primary, Demongeot, Adrien, additional, Vaucher, Joanne, additional, Leterrier, Yves, additional, Avaro, Jonathan, additional, Liebi, Marianne, additional, Neels, Antonia, additional, Burgert, Ingo, additional, Zimmermann, Tanja, additional, Nyström, Gustav, additional, and Siqueira, Gilberto, additional

Published
2022
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