Structure characterization of cellulose nanofiber hydrogel as functions of concentration and ionic strength

Geng, Lihong; Peng, Xiangfang; Zhan, Chengbo; Naderi, Ali; Sharma, Priyanka R.; Mao, Yimin; Hsiao, Benjamin S.

doi:10.1007/s10570-017-1496-2

Cited by 62 publications

(64 citation statements)

References 49 publications

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“…In particular, polyvalent electrolytes (e.g., Ca 2+ ) can act as cross-linkers between fibers, reducing their mobility and consequently inducing a non-reversible gelation (Figure 2c). This gelation occurs rapidly ( Figure 2d) and the mechanical and rheological properties of the hydrogel formed can be tuned by varying the cation nature and concentration [35,36]. Figure 3 shows the dynamic viscosity curve, η* = ƒ( ), from flow rheological tests of four samples with CaCl2 concentration ranging from 10 mM (1) to 0 mM (4) and TOUS-CNFs concentration (w/v) of 0.5% (A), 1.0% (B), 2.0% (C).…”

Section: Rheological Propertiesmentioning

confidence: 99%

“…The further addition of electrolytes (e.g., Al 3+ , Fe 3+ , Zn 2+ , Cu 2+ , Ca 2+ ) into TOUS-CNFs dispersions screens the superficial charges leading to the reduction of mobility of the chain and, consequently, to the cross-linking between fibrils [34]. Under these conditions, gelation occurs rapidly and the mechanical and rheological properties of the gels obtained can be modulated by varying the cation nature and concentration [35,36]. Such hydrogels can find use in biomedicine for the controlled release of active principles [37], to enhance fibroblast adhesion [35,36], and for the preparation of macroporous hydrogel scaffolds supporting the growth of mouse fibroblast cells [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

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TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

et al. 2020

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Stable hydrogels with tunable rheological properties were prepared by adding Ca2+ ions to aqueous dispersions of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO)-oxidized and ultra-sonicated cellulose nanofibers (TOUS-CNFs). The gelation occurred by interaction among polyvalent cations and the carboxylic units introduced on TOUS-CNFs during the oxidation process. Both dynamic viscosity values and pseudoplastic rheological behaviour increased by increasing the Ca2+ concentration, confirming the cross-linking action of the bivalent cation. The hydrogels were proved to be suitable controlled release systems by measuring the diffusion coefficient of a drug model (ibuprofen, IB) by high-resolution magic angle spinning (HR-MAS) nuclear magnetic resonance (NMR) spectroscopy. IB was used both as free molecule and as a 1:1 pre-formed complex with β-cyclodextrin (IB/β-CD), showing in this latter case a lower diffusion coefficient. Finally, the cytocompatibility of the TOUS-CNFs/Ca2+ hydrogels was demonstrated in vitro by indirect and direct tests conducted on a L929 murine fibroblast cell line, achieving a percentage number of viable cells after 7 days higher than 70%.

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Section: Rheological Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

et al. 2020

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“…[ 17 ] The presence of OH groups on the cellulosic nanofibrous surface could suppress Cu atoms from oxidation. The cellulosic nanofibrous membrane [ 18 ] is prepared by a cellulosic nanofiber layer (fiber diameter 5 nm) on an electrospun polyacrylonitrile layer (fiber diameter 150 nm) which is deposited on poly(ethylene terephthalate) (PET) substrate (fiber diameter 20 µm) (Figure 2b). After placing a drop of the NCs/NPs solution on cellulosic nanofibrous surface under ambient condition, high‐resolution transmission electron microscopy (HRTEM) analysis revealed that NPs are largely surrounded by an atomically ordered layer of AuCu 3 (Figure 2c,d and Figure S4, Supporting Information).…”

Section: Figurementioning

confidence: 99%

“…The measured surface roughness of the sintered nanoink film ( R a = 24 and R q = 32 nm) is in fact comparable to that of the substrate ( R a = 42, R q = 56 nm). [ 18 ] Piranha is powerful to etch away or decompose any organic species including the substrate. A free‐standing metallic thin film was obtained after the piranha decomposition of the organic matrix (Figure S6, Supporting Information).…”

Section: Figurementioning

confidence: 99%

Surface‐Mediated Interconnections of Nanoparticles in Cellulosic Fibrous Materials toward 3D Sensors

et al. 2020

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Fibrous materials serve as an intriguing class of 3D materials to meet the growing demands for flexible, foldable, biocompatible, biodegradable, disposable, inexpensive, and wearable sensors and the rising desires for higher sensitivity, greater miniaturization, lower cost, and better wearability. The use of such materials for the creation of a fibrous sensor substrate that interfaces with a sensing film in 3D with the transducing electronics is however difficult by conventional photolithographic methods. Here, a highly effective pathway featuring surface‐mediated interconnection (SMI) of metal nanoclusters (NCs) and nanoparticles (NPs) in fibrous materials at ambient conditions is demonstrated for fabricating fibrous sensor substrates or platforms. Bimodally distributed gold–copper alloy NCs and NPs are used as a model system to demonstrate the semiconductive‐to‐metallic conductivity transition, quantized capacitive charging, and anisotropic conductivity characteristics. Upon coupling SMI of NCs/NPs as electrically conductive microelectrodes and surface‐mediated assembly (SMA) of the NCs/NPs as chemically sensitive interfaces, the resulting fibrous chemiresistors function as sensitive and selective sensors for gaseous and vaporous analytes. This new SMI–SMA strategy has significant implications for manufacturing high‐performance fibrous platforms to meet the growing demands of the advanced multifunctional sensors and biosensors.

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“…The popularity of electrospun nanofibers has a close relationship with their small diameters, huge surface area and large porosity [52][53][54]. However, for a single-fluid electrospinning process, the treated fluids must be electrospinnable to keep the formation of solid linear nanofibers, or they will be degraded into particles or even wet films [40,55]. The modified coaxial electrospinning, with an unspinnable sheath fluid on a spinnable core fluid, can't be utilized to prepare some advanced nanostructures presently such as hollow fibers from a traditional coaxial processes [56,57], which can be viewed as a special core-shell structure with an empty core.…”

Section: Nanocoating Of Inorganic Materials On Polymeric Fibers For Amentioning

confidence: 99%

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

Wang

Yang

et al. 2020

Polymers

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Electrospinning, as a promising platform in multidisciplinary engineering over the past two decades, has overcome major challenges and has achieved remarkable breakthroughs in a wide variety of fields such as energy, environmental, and pharmaceutics. However, as a facile and cost-effective approach, its capability of creating nanofibers is still strongly limited by the numbers of treatable fluids. Most recently, more and more efforts have been spent on the treatments of liquids without electrospinnability using multifluid working processes. These unspinnable liquids, although have no electrospinnability themselves, can be converted into nanofibers when they are electrospun with an electrospinnable fluid. Among all sorts of multifluid electrospinning methods, coaxial electrospinning is the most fundamental one. In this review, the principle of modified coaxial electrospinning, in which unspinnable liquids are explored as the sheath working fluids, is introduced. Meanwhile, several typical examples are summarized, in which electrospun nanofibers aimed for the environment remediation were prepared using the modified coaxial electrospinning. Based on the exploration of unspinnable liquids, the present review opens a way for generating complex functional nanostructures from other kinds of multifluid electrospinning methods.

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Structure characterization of cellulose nanofiber hydrogel as functions of concentration and ionic strength

Cited by 62 publications

References 49 publications

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

Surface‐Mediated Interconnections of Nanoparticles in Cellulosic Fibrous Materials toward 3D Sensors

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

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