Bibliographies thématiques / HYDROGEL NANOFIBERS

Littérature scientifique sur le sujet « HYDROGEL NANOFIBERS »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "HYDROGEL NANOFIBERS"

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Martin, Alma, Jenny Natalie Nyman, Rikke Reinholdt, Jun Cai, Anna-Lena Schaedel, Mariena J. A. van der Plas, Martin Malmsten, Thomas Rades et Andrea Heinz. « In Situ Transformation of Electrospun Nanofibers into Nanofiber-Reinforced Hydrogels ». Nanomaterials 12, no 14 (16 juillet 2022) : 2437. http://dx.doi.org/10.3390/nano12142437.

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Nanofiber-reinforced hydrogels have recently gained attention in biomedical engineering. Such three-dimensional scaffolds show the mechanical strength and toughness of fibers while benefiting from the cooling and absorbing properties of hydrogels as well as a large pore size, potentially aiding cell migration. While many of such systems are prepared by complicated processes where fibers are produced separately to later be embedded in a hydrogel, we here provide proof of concept for a one-step solution. In more detail, we produced core-shell nanofibers from the natural proteins zein and gelatin by coaxial electrospinning. Upon hydration, the nanofibers were capable of directly transforming into a nanofiber-reinforced hydrogel, where the nanofibrous structure was retained by the zein core, while the gelatin-based shell turned into a hydrogel matrix. Our nanofiber-hydrogel composite showed swelling to ~800% of its original volume and water uptake of up to ~2500% in weight. The physical integrity of the nanofiber-reinforced hydrogel was found to be significantly improved in comparison to a hydrogel system without nanofibers. Additionally, tetracycline hydrochloride was incorporated into the fibers as an antimicrobial agent, and antimicrobial activity against Staphylococcus aureus and Escherichia coli was confirmed.
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Guancha-Chalapud, Marcelo A., Liliana Serna-Cock et Diego F. Tirado. « Aloe vera Rind Valorization to Improve the Swelling Capacity of Commercial Acrylic Hydrogels ». Fibers 10, no 9 (30 août 2022) : 73. http://dx.doi.org/10.3390/fib10090073.

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Acrylic hydrogels have been used in agriculture to increase the availability of water in the soil; cause faster plant growth and increase plant survival to water stress; allow controlled release of fertilizers; and, therefore, increase crop yields. On the other hand, Aloe vera gel production generates a large amount of solid waste as cuticles, which is currently underutilized despite that it is a good source of cellulose nanofibers that could be used to improve the swelling capacity of commercial acrylic hydrogels. In this work, both morphology (SEM) and particle size (TEM) of the cellulose nanofibers obtained from A. vera cuticles by the acid hydrolysis method combined with ultrasound were analyzed; as well as the presence of functional groups (FITR) and thermal stability (TGA). Then, acrylic hydrogels were synthesized by the solution polymerization method, and nanofibers were added to these hydrogels at different concentrations (0% w w−1, 3% w w−1, 5% w w−1, and 10% w w−1). These concentrations had a nonlinear relationship with the swelling capacity, and the hydrogel reinforced at 3% cellulose nanofiber was chosen as the best formulation in this work, as this one improved the swelling capacity of hydrogels at equilibrium (476 g H2O g hydrogel−1) compared to the hydrogel without nanofiber (310 g H2O g hydrogel−1), while hydrogels with 10% nanofiber had a similar swelling capacity to the non-reinforced hydrogel (295 H2O g hydrogel−1). Therefore, cellulose-based superabsorbent hydrogels with potential application in agriculture were developed in this work.
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Bayer, Ilker S. « A Review of Sustained Drug Release Studies from Nanofiber Hydrogels ». Biomedicines 9, no 11 (4 novembre 2021) : 1612. http://dx.doi.org/10.3390/biomedicines9111612.

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Polymer nanofibers have exceptionally high surface area. This is advantageous compared to bulk polymeric structures, as nanofibrils increase the area over which materials can be transported into and out of a system, via diffusion and active transport. On the other hand, since hydrogels possess a degree of flexibility very similar to natural tissue, due to their significant water content, hydrogels made from natural or biodegradable macromolecular systems can even be injectable into the human body. Due to unique interactions with water, hydrogel transport properties can be easily modified and tailored. As a result, combining nanofibers with hydrogels would truly advance biomedical applications of hydrogels, particularly in the area of sustained drug delivery. In fact, certain nanofiber networks can be transformed into hydrogels directly without the need for a hydrogel enclosure. This review discusses recent advances in the fabrication and application of biomedical nanofiber hydrogels with a strong emphasis on drug release. Most of the drug release studies and recent advances have so far focused on self-gelling nanofiber systems made from peptides or other natural proteins loaded with cancer drugs. Secondly, polysaccharide nanofiber hydrogels are being investigated, and thirdly, electrospun biodegradable polymer networks embedded in polysaccharide-based hydrogels are becoming increasingly popular. This review shows that a major outcome from these works is that nanofiber hydrogels can maintain drug release rates exceeding a few days, even extending into months, which is an extremely difficult task to achieve without the nanofiber texture. This review also demonstrates that some publications still lack careful rheological studies on nanofiber hydrogels; however, rheological properties of hydrogels can influence cell function, mechano-transduction, and cellular interactions such as growth, migration, adhesion, proliferation, differentiation, and morphology. Nanofiber hydrogel rheology becomes even more critical for 3D or 4D printable systems that should maintain sustained drug delivery rates.
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Guancha-Chalapud, Marcelo A., Liliana Serna-Cock et Diego F. Tirado. « Hydrogels Are Reinforced with Colombian Fique Nanofibers to Improve Techno-Functional Properties for Agricultural Purposes ». Agriculture 12, no 1 (14 janvier 2022) : 117. http://dx.doi.org/10.3390/agriculture12010117.

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Colombia is the world’s largest producer of fique fibers (Furcraea bedinghausii), with a net production of 30,000 tons per year. This work proposes to revalue waste from the Colombian fique agroindustry. For this purpose, cellulose nanofibers were obtained from fique and used as reinforcement material to create acrylic superabsorbent hydrogels. Unreinforced acrylic hydrogels (AHR0) and acrylic hydrogels reinforced with fique nanofibers at 3% w/w (AHR3), 5% w/w (AHR5), and 10 % w/w (AHR10) were synthesized using the solution polymerization method. The best hydrogel formulation for agricultural purposes was chosen by comparing their swelling behavior, mechanical properties, and using scanning electron microscopy (SEM). By raising the nanofiber concentration to 3% (AHR3), the best-chosen formulation, the interaction between the nanofibers and the polymer matrix increased, which favored the network stability. However, beyond AHR3, there was a higher viscosity of the reactive system, which caused a reduction in the mobility of the polymer chains, thus disfavoring the swelling capacity. The reinforced hydrogel proposed in this study (AHR3) could represent a contribution to overcoming the problems of land dryness present in Colombia, an issue that will worsen in the coming years due to the climate emergency.
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Chi, Hsiu Yu, Nai Yun Chang, Chuan Li, Vincent Chan, Jang Hsin Hsieh, Ya-Hui Tsai et Tingchao Lin. « Fabrication of Gelatin Nanofibers by Electrospinning—Mixture of Gelatin and Polyvinyl Alcohol ». Polymers 14, no 13 (27 juin 2022) : 2610. http://dx.doi.org/10.3390/polym14132610.

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Gelatin, one of the most abundant, naturally derived biomacromolecules from collagen, is widely applicable in food additives, cosmetic ingredients, drug formulation, and wound dressing based on their non-toxicity and biodegradability. In parallel, polyvinyl alcohol (PVA), a synthetic polymer, has been commonly applied as a thickening agent for coating processes in aqueous systems and a major component in healthcare products for cartilage replacements, eye lubrication, and contact lenses. In this study, a new type of mixed hydrogel nanofiber was fabricated from gelatin and polyvinyl alcohol by electrospinning under a feasible range of polymer compositions. To determine the optimal composition of gelatin and polyvinyl alcohol in nanofiber fabrication, several key physicochemical properties of mixed polymer solutions such as viscosity, surface tension, pH, and electrical conductance were thoroughly characterized by a viscometer, surface tensiometer, water analyzer, and carbon electron probe. Moreover, the molecular structures of polymeric chains within mixed hydrogel nanofibers were investigated with Fourier-transform infrared spectroscopy. The morphologies and surface elemental compositions of the mixed hydrogel nanofibers were examined by the scanning electron microscope and energy-dispersive X-ray spectroscopy, respectively. The measurement of water contact angles was performed for measuring the hydrophilicity of nanofiber surfaces. Most importantly, the potential cytotoxicity of the electrospun nanofibers was evaluated by the in vitro culture of 3T3 fibroblasts. Through our extensive study, it was found that a PVA-rich solution (a volumetric ratio of gelatin/polyvinyl alcohol <1) would be superior for the efficient production of mixed hydrogel nanofibers by electrospinning techniques. This result is due to the appropriate balance between the higher viscosity (~420–~4300 10−2 poise) and slightly lower surface tension (~35.12–~32.68 mN/m2) of the mixed polymer solution. The regression on the viscosity data also found a good fit by the Lederer–Rougier’s model for a binary mixture. For the hydrophilicity of nanofibers, the numerical analysis estimates that the value of interfacial energy for the water contact on nanofibers is around ~−0.028 to ~−0.059 J/m2.
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Doench, Ingo, Tuan Tran, Laurent David, Alexandra Montembault, Eric Viguier, Christian Gorzelanny, Guillaume Sudre et al. « Cellulose Nanofiber-Reinforced Chitosan Hydrogel Composites for Intervertebral Disc Tissue Repair ». Biomimetics 4, no 1 (20 février 2019) : 19. http://dx.doi.org/10.3390/biomimetics4010019.

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The development of non-cellularized composites of chitosan (CHI) hydrogels, filled with cellulose nanofibers (CNFs) of the type nanofibrillated cellulose, was proposed for the repair and regeneration of the intervertebral disc (IVD) annulus fibrosus (AF) tissue. With the achievement of CNF-filled CHI hydrogels, biomaterial-based implants were designed to restore damaged/degenerated discs. The structural, mechanical and biological properties of the developed hydrogel composites were investigated. The neutralization of weakly acidic aqueous CNF/CHI viscous suspensions in NaOH yielded composites of physical hydrogels in which the cellulose nanofibers reinforced the CHI matrix, as investigated by means of microtensile testing under controlled humidity. We assessed the suitability of the achieved biomaterials for intervertebral disc tissue engineering in ex vivo experiments using spine pig models. Cellulose nanofiber-filled chitosan hydrogels can be used as implants in AF tissue defects to restore IVD biomechanics and constitute contention patches against disc nucleus protrusion while serving as support for IVD regeneration.
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Hu, Enyi, Yihui Liang, Kangcha Chen, Xian Li et Jianhui Zhou. « Nanofibrous Wound Healing Nanocomposite Based on Alginate Scaffold : In Vitro and In Vivo Study ». Journal of Biomedical Nanotechnology 18, no 10 (1 octobre 2022) : 2439–45. http://dx.doi.org/10.1166/jbn.2022.3441.

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The combination of nanofibers with 3D scaffolds has shown promising results as the wound healing/dressing/care biomaterials. The present study aimed to fabricate and optimized alginate hydrogel composited by Lignin-derived carbon nanofibers (CNFs). The nanofibers were obtained from electrospun Lignin nanofibers as the precursor through two steps heat treatments. The synthesized nanofibers blended with an alginate polymer solution with different concentrations (1, 5, and 10 wt.%) and cross-linked using CaCl2 through the physical cross-linking. The findings illustrated that the prepared Lignin and CNFs have acceptable diameter. The composited Alginate hydrogels possessed a porous internal-structure with interconnected architecture. The fabricated hydrogel exhibited proper porosity and swelling behavior beneficial for wound healing application. The In Vitro experiments revealed that the hydrogel were red blood cell (RBC)-compatible, cytocompatible, and induced proliferative effects on cells. The animal experiments indicated that the application of the hydrogel promoted the process of wound healing. These observations implied that the prepared hydrogel nanocomposites exhibited promising properties and can be considered as wound healing nanobiomaterials.
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Bocková, Markéta, Aleksei Pashchenko, Simona Stuchlíková, Hana Kalábová, Radek Divín, Petr Novotný, Andrea Kestlerová et al. « Low Concentrated Fractionalized Nanofibers as Suitable Fillers for Optimization of Structural–Functional Parameters of Dead Space Gel Implants after Rectal Extirpation ». Gels 8, no 3 (4 mars 2022) : 158. http://dx.doi.org/10.3390/gels8030158.

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Dead space after rectal resection in colorectal surgery is an area with a high risk of complications. In this study, our goal was to develop a novel 3D implant based on composite hydrogels enriched with fractionalized nanofibers. We employed, as a novel approach in abdominal surgery, the application of agarose gels functionalized with fractionalized nanofibers on pieces dozens of microns large with a well-preserved nano-substructure. This retained excellent cell accommodation and proliferation, while nanofiber structures in separated islets allowed cells a free migration throughout the gel. We found these low-concentrated fractionalized nanofibers to be a good tool for structural and biomechanical optimization of the 3D hydrogel implants. In addition, this nano-structuralized system can serve as a convenient drug delivery system for a controlled release of encapsulated bioactive substances from the nanofiber core. Thus, we present novel 3D nanofiber-based gels for controlled release, with a possibility to modify both their biomechanical properties and drug release intended for 3D lesions healing after a rectal extirpation, hysterectomy, or pelvic exenteration.
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Gunes, Oylum Colpankan, Aylin Ziylan Albayrak, Seyma Tasdemir et Aylin Sendemir. « Wet-electrospun PHBV nanofiber reinforced carboxymethyl chitosan-silk hydrogel composite scaffolds for articular cartilage repair ». Journal of Biomaterials Applications 35, no 4-5 (29 juin 2020) : 515–31. http://dx.doi.org/10.1177/0885328220930714.

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The objective of the study was to produce three-dimensional and porous nanofiber reinforced hydrogel scaffolds that can mimic the hydrated composite structure of the cartilage extracellular matrix. In this regard, wet-electrospun poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanofiber reinforced carboxymethyl chitosan-silk fibroin (PNFs/CMCht-SF) hydrogel composite scaffolds that were chemically cross-linked by poly(ethylene glycol) diglycidyl ether (PEGDE) were produced. To the best of our knowledge, this is the first study in cartilage regeneration where a three dimensional porous spongy composite scaffold was obtained by the dispersion of wet-electrospun nanofibers within a polymer matrix. All of the produced hydrogel composite scaffolds had an interconnected microporous structure with well-integrated PHBV nanofibers on the pore walls. The scaffold comprising an equal amount of PEGDE and polymer (PNFs/CMCht-SF1:PEGDE1) demonstrated comparable water content (91.4 ± 0.7%), tan δ (0.183 at 1 Hz) and compressive strength (457 ± 85 kPa) values to that of articular cartilage. Besides, based on the histological analysis, this hydrogel composite scaffold supported the chondrogenic differentiation of bone marrow mesenchymal stem cells. Consequently, this hydrogel composite scaffold presented a great promise for cartilage tissue regeneration.
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Wang, Bo-Xiang, Jia Li, De-Hong Cheng, Yan-Hua Lu et Li Liu. « Fabrication of Antheraea pernyi Silk Fibroin-Based Thermoresponsive Hydrogel Nanofibers for Colon Cancer Cell Culture ». Polymers 14, no 1 (29 décembre 2021) : 108. http://dx.doi.org/10.3390/polym14010108.

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Antheraea pernyi silk fibroin (ASF)-based nanofibers have wide potential for biomaterial applications due to superior biocompatibility. It is not clear whether the ASF-based nanofibers scaffold can be used as an in vitro cancer cell culture platform. In the current study, we fabricated novel ASF-based thermoresponsive hydrogel nanofibers by aqueous electrospinning for colon cancer (LoVo) cells culture. ASF was reacted with allyl glycidyl ether (AGE) for the preparation of allyl silk fibroin (ASF-AGE), which provided the possibility of copolymerization with allyl monomer. The investigation of ASF-AGE structure by 1H NMR revealed that reactive allyl groups were successfully linked with ASF. ASF-based thermoresponsive hydrogel nanofibers (p (ASF-AGE-NIPAAm)) were successfully manufactured by aqueous electrospinning with the polymerization of ASF and N-isopropylacrylamide (NIPAAm). The p (ASF-AGE-NIPAAm) spinning solution showed good spinnability with the increase of polymerization time, and uniform nanofibers were formed at the polymerization time of 360 min. The obtained hydrogel nanofibers exhibited good thermoresponsive that the LCST was similar with PNIPAAm at about 32 °C, and good degradability in protease XIV PBS solution. In addition, the cytocompatibility of colon cancer (LoVo) cells cultured in hydrogel nanofibers was assessed. It was demonstrated that LoVo cells grown on hydrogel nanofibers showed improved cell adhesion, proliferation, and viability than those on hydrogel. The results suggest that the p (ASF-AGE-NIPAAm) hydrogel nanofibers have potential application in LoVo cells culture in vitro. This study demonstrates the feasibility of fabricating ASF-based nanofibers to culture LoVo cancer cells that can potentially be used as an in vitro cancer cell culture platform.
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Thèses sur le sujet "HYDROGEL NANOFIBERS"

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Ahmadi, Mojtaba. « Mechanics of Surface Instabilities of Soft Nanofibers and Nonlinear Contacts of Hydrogels ». Diss., North Dakota State University, 2020. https://hdl.handle.net/10365/31861.

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The research of this dissertation is formulated in two fields, i.e., the theoretical and computational studies of circumferential wrinkling on soft nanofibers and the swelling mechanics study of a bi-layered spherical hydrogel containing a hard core. Continuous polymer nanofibers have been massively produced by means of the low-cost, top-down electrospinning technique. As a unique surface instability phenomenon, surface wrinkling in circumferential direction is commonly observed on soft nanofibers in electrospinning. In this study, a theoretical continuum mechanics model is developed to explore the mechanisms of circumferential wrinkling on soft nanofibers under uniaxial stretching. The model is able to examine the effects of elastic properties, surface energy, and fiber radius on the critical axial stretch to trigger circumferential wrinkling and to discover the threshold fiber radius to initiate spontaneous wrinkling. In addition, nonlinear finite element method (FEM) is further adopted to predict the critical mismatch strain to evoke circumferential wrinkling in core-shell polymer nanofibers containing a hard core, as a powerful computational tool to simulate controllable wrinkling on soft nanofibers via co-electrospinning polymer nanofibers incorporated with nanoparticles as the core. The studies provide rational understanding of surface wrinkling in polymer nanofibers and technical approaches to actively tune surface morphologies of polymer nanofibers for particular applications, e.g. high-grade filtration, oil-water separation, polymer nanocomposites, wound dressing, tissue scaffolding, drug delivery, and renewable energy harvesting, conversion, and storage, etc. Furthermore, hydrogels are made of cross-linked polymer chains that can swell significantly when imbibing water and exhibit inhomogeneous deformation, stress, and, water concentration fields when the swelling is constrained. In this study, a continuum mechanics field theory is adopted to study the swelling behavior of a bi-layered spherical hydrogel containing a hard core. The problem is reduced into a two-point boundary value problem of a 2nd-order nonlinear ordinary differential equation (ODE) and solved numerically. Effects of material properties on the deformation, stress, and water concentration fields of the hydrogel are examined. The study offers a rational route to design and regulate hydrogels with tailorable swelling behavior for practical applications in drug delivery, leakage blocking, etc.
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GUPTA, PREETI. « HYDROGEL BASED WOUND DRESSING MATERIAL ». Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18806.

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Weak mechanical strength of hydrogels in wet condition limits their use for load bearing applications. Their mechanical strength can be raised by grafting them over some support or by converting them into nanofibrous form. Present thesis is focused on the preparation of poly (acrylamide-co-acrylic acid) hydrogel grafted over cotton fabric using two different cross-linkers i.e. PEG and MBAAm for making medicated dressing and nanofibers of hydrogel of poly (acrylamide-co-acrylic acid). FTIR was used to confirm the insertion of cross-links into the polymer chains. Grafting of uniform hydrogel layer on cotton surface and formation of hydrogel nanofibers were confirmed by using SEM. The average fibre diameter was found to be 275±94.5 nm. Swelling of composite prepared using PEG followed first-order kinetic model at acidic and neutral pH whereas second-order kinetic model at pH 8.5 while that prepared using MBAAm followed second-order kinetic equation at all the pHs studied. The kinetics of swelling was also governed by Peppas model at all pHs. Release of drug from both the composites was studied in phosphate buffers having pH 5.5,7 and 8.5 at 37±0.1°C and observed that it was fastest in phosphate buffer having pH 7. On fitting drug release data into different models, it was observed that drug release was diffusion controlled and followed Fickian diffusion mechanism in case of composite prepared by using PEG as cross-linker whereas it was controlled by diffusion as well as chain relaxation in case of composite prepared by using MBAAm. Mechanical testing using Universal Testing Machine supported a higher mechanical strength of the hydrogel composite as compared to its film. Swelling behaviour of Nanofibrous mats was found to be highest at neutral pH and it followed second order kinetics at all pHs. The drug release kinetics was further evaluated and found that it took place by Fickian diffusion (n < 0.5) and followed second order release kinetics. Antimicrobial tests were performed to show the effectiveness of drug loaded within the hydrogel samples.
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Sato, Tabata Do Prado. « Desenvolvimento de biomateriais à base de quitosana : matriz de fibras eletrofiadas para regeneração tecidual e de hidrogel coacervado para entrega controlada de fármaco / ». São José dos Campos, 2019. http://hdl.handle.net/11449/191168.

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Orientador: Alexandre Luiz Souto Borges
Coorientador: Artur José Monteiro Valente
Banca: Bruno Vinícius Manzolli Rodrigues
Banca: Fernanda Alves Feitosa
Banca: Lafayette Nogueira Júnior
Banca: Eduardo Shigueyuki Uemura
Resumo: Os atuais avanços no desenvolvimento de biomateriais caminham para 2 áreas promissoras: a de regeneração tecidual e a de entrega controlada de fármacos. Assim, o presente estudo objetivou a síntese e caracterização de diferentes matrizes (fibras e hidrogel) à base de quitosana, a fim de se obter materiais biomiméticos para atuação em ambas áreas. Para regeneração, delineou-se a síntese de um arcabouço de fibras de quitosana com e sem cristais de nanohidroxiapatita onde, para isso, foram eletrofiadas soluções de quitosana (Ch) e de quitosana com nanohidroxiapatita (ChHa). Os espécimes de Ch apresentaram maior homogeneidade e maior diâmetro médio de fibras (690 ± 102 nm) que ChHa (358 ± 49 nm). No teste de viabilidade celular e na atividade da fosfatase alcalina não houve diferença estatística entre os grupos experimentais (Ch e ChHa), porém ambos diferiram do grupo controle (p < 0,001). Para o âmbito de liberação de fármacos, sintetizou-se, pela técnica de emulsão, dois tipos de hidrogéis: o primeiro, uma mistura da fase aquosa da solução de Ch (1 mL) e da solução de DNA (1 mL) (1:1) e o segundo, mistura da fase aquosa da solução de Ch (1 mL) e solução de Pectina (1 mL) (1:1). Ambas misturas foram realizadas em álcool benzílico (5 mL) com instrumento de dispersão de alto desempenho (31-34000 rpm min-1 por 5 min). Após a obtenção dos géis, 20mg de cada grupo foram imersos em uma solução aquosa de Própolis Verde (PV), na concentração de 70 μg/mL por 2 h e a cinética de liberação... (Resumo completo, clicar acesso eletrônico abaixo)
Current advances in biomaterial development are moving to 2 promising areas: tissue regeneration and controlled drug delivery. Thus, the present study aimed the synthesis and characterization of different matrices (fibers and hydrogel) based on chitosan, in order to obtain biomimetic materials for performance in both areas. For regeneration, the synthesis of a scaffold of chitosan fibers with and without nanohydroxyapatite crystals was delineated, where chitosan (Ch) and chitosan with hydroxyapatite (ChHa) solutions were electrospun. Ch specimens presented higher homogeneity and larger mean fiber diameter (690±102nm) than ChHa (358 ± 49nm). In the cell viability test and alkaline phosphatase activity there was no statistical difference between the experimental groups. (Ch and ChHa), but both differed from the control group (p < 0,001). For the drug release scope, two types of hydrogels were synthesized by the emulsion technique: the first, a mixture of the aqueous phase of Ch solution (1 mL) and DNA solution (1 mL) (1:1) and the second, mixture of the aqueous phase of the Ch solution (1mL) and Pectin solution (1 mL) (1:1). Both mixtures were performed in benzyl alcohol (5 mL) with high performance dispersion instrument (31-34000 rpm min-1 for 5 min). After obtaining the gels, 20mg from each group were immersed in an aqueous solution of Propolis Green (PV), at a concentration of 70 µg/mL for 2 h and the release kinetics of PV were analyzed at 25 and 37oC in water and artificial saliva. The obtained specimens were lyophilized and then physically-chemically characterized. The presence of pectin and DNA was confirmed by FTIR. PV sorption induced a significant modification of the gel surface. A phase separation was found between chitosan and DNA. Encapsulation efficiency did not change significantly between 25 and 37oC. The release kinetics in water or saliva presented a two-step mechanism. And the biological results...
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Philip, Diana Liz. « The Influence of Synthetic Microenvironments in Determining Stem Cell Fate ». University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627669247178055.

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Baddour, Joelle. « An Approach to Lens Regeneration in Mice Following Lentectomy and the Implantation of a Biodegradable Hydrogel Encapsulating Iris Pigmented Tissue in Combination with Basic Fibroblast Growth Factor ». University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1335916825.

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McCaldin, Simon Roger. « Hydrogen storage in graphitic nanofibres ». Thesis, University of Nottingham, 2007. http://eprints.nottingham.ac.uk/11568/.

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There is huge need to develop an alternative to hydrocarbons fuel, which does not produce CO2 or contribute to global warming - 'the hydrogen economy' is such an alternative, however the storage of hydrogen is the key technical barrier that must be overcome. The potential of graphitic nanofibres (GNFs) to be used as materials to allow the solid-state storage of hydrogen has thus been investigated. This has been conducted with a view to further developing the understanding of the mechanism(s) of hydrogen storage in GNFs and modifying the material structure to maximise the amount of hydrogen that can be reversibly stored in the material. GNFs were synthesised using chemical vapour deposition (CVD) with careful control of temperature and gas mixture to create predominately herringbone GNFs from both Iron and Nickel catalysts. Within this, it was found that once GNF growth has been initiated under certain conditions, alteration of those conditions does not alter the fundamental structure of the GNF synthesised, but can increase the carbon yield, although reorientation of the surfaces was observed. The GNFs synthesised were subsequently chemically (acid washed and CO2 oxidised) and thermally treated to remove the residual CVD catalyst and alter their surface structures in an attempt to allow dihydrogen molecules to penetrate and adsorb onto the internal graphene layers. However, it was found that after initial growth, the surface layers of the GNFs became re-orientated parallel to the fibre axis - representing a large energy barrier to adsorption onto the surfaces of the internal graphene layers. By careful use and control of conditions, this re-orientated layer can be removed to yield GNFs with cleaned surfaces. Once GNFs with cleaned edges had been synthesised, these were modified to remove oxygen species from their surfaces. To further develop the understanding of the potential hydrogen uptake mechanisms, Pd particles were introduced to the GNF surfaces to act as catalyst gateways. By carefully controlling the variables of the incipient wetness process, a variety of morphologies and structures were synthesised. This allowed the precise determination of the hydrogen uptake mechanism occurring in samples by Kubas binding, Dissociation or Spill-over mechanisms. All of the GNFs created have had their hydrogen uptake capacities precisely determined using a Sieverts apparatus designed and constructed by the author. None of the samples were found to adsorb any significant levels of hydrogen (>0.1 wt%), regardless of the treatments applied to them – this result has been discussed in light of the existing claims for high hydrogen uptake in GNFs made within the literature. The conclusion of this thesis is that no hydrogen uptake capacity could be observed in the GNFs synthesised during the project, however, the development of the uptake mechanisms and GNF structures has led to suggested modifications that may yield GNFs suitable for storing large quantities of hydrogen (i.e. in excess of US-DOE targets).
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Haji, Aminoddin, Komeil Nasouri, Ahmad Mousavi Shoushtari et Ali Kaflou. « Reversible Hydrogen Storage in Electrospun Composite Nanofibers ». Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35201.

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Composite nanofibers containing single-walled carbon nanotubes (SWNT) were prepared by using elec-trospinning technique and hydrogen adsorption/desorption isotherms were carried out by a Sieverts appa-ratus at room temperature. The SEM analysis of the nanofibers revealed that the deformation of the nano-fiber increases with increasing SWNT concentration. The diameter of neat nanofibers was below 200 nm and had smooth surface. The surface of the composite nanofibers was rough even by adding low quantity of SWNT. The hydrogen storage results showed an improvement in the adsorption capacity with increasing the SWNT content in composite nanofibers. These nanofibers were evacuated again to remove the ad-sorbed hydrogen at room temperature. Moreover, even though specific surface area and total pore volume were important factors for increasing the capacity of hydrogen adsorption. Finally, maximum adsorption capacity was 0.29 wt % in case of nanofibers with 10 wt % SWNT under 30 bar at 298 K. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35201
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Guo, Yuanhao. « Reinforcement of Hydrogels by Nanofiber Network ». University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1367237415.

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Yang, Xianpeng. « Strong Cellulose Nanofiber Composite Hydrogels via Interface Tailoring ». Kyoto University, 2020. http://hdl.handle.net/2433/253333.

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Mushi, Ngesa Ezekiel. « Chitin nanofibers, networks and composites : Preparation, structure and mechanical properties ». Doctoral thesis, KTH, Biokompositer, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155528.

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Chitin is an important reinforcing component in load-bearing structures in many organisms such as insects and crustaceans (i.e. shrimps, lobsters, crabs etc.). It is of increasing interest for use in packaging materials as well as in biomedical applications. Furthermore, biological materials may inspire the development of new man-made material concepts. Chitinmolecules are crystallized in extended chain conformations to form nanoscale fibrils of about 3 nm in diameter. In the present study, novel materialshave been developed based on a new type of chitin nanofibers prepared from the lobster exoskeleton. Improved understanding about effects of chitin from crustaceans and chitin material preparation on structure is provided through Atomic Force Microscopy(AFM) (paper I&II), Scanning Transmission Electron Microscopy(STEM) (paper I&II), X-Ray Diffraction (XRD), Intrinsic Viscosity, solid state 13C Nuclear Magnetic Resonance (NMR) (paper II), Field Emission Scanning Electron Microscopy(FE-SEM) (paper I, II, III, IV & V), Ultraviolet-Visible Spectrophotometryand Dynamic Light Scattering (DLS) (paper III). The presence of protein was confirmed through colorimetric method(paper I & II). An interesting result from the thesis is the new features of chitin nanofiber including small diameter, high molar mass or nanofiber length,and high purity. The structure and composition of the nanofibers confirms this (paper I & II). Furthermore, the structure and properties of the corresponding materials confirm the uniqueness of the present nanofibers: chitin membrane (I & II), polymer matrix composites (III),and hydrogels (paper IV). Improved mechanical properties compared with typical data from the literature were confirmed for chitin nanofiber membranes in paper II, chitin-chitosan polymer matrix composites in paper III, and chitin hydrogel in paper IV. Mechanical tests included dynamic mechanical analysis and uniaxial tensile tests. Mechanical properties of chitin hydrogels were evaluated based onrheological and compression properties (paper IV). The values were the highest reported for this kind of chitin material. Furthermore, the relationships between materials structure and properties were analyzed. For membranes and polymer matrix nanocomposites, the degree of dispersion is an important parameter. For the hydrogels, the preparation procedure is very simple and has interesting practical potential. Chitin-binding characteristics of cuticular proteins areinteresting fornovel bio-inspired material development. In the present work(paper V), chitin nanofibers with newfeaturesincluding high surface area and low protein content were combined with resilin-like protein possessing the chitin-binding characteristics. Hydrated chitin-resilin nanocomposites with similar composition as in rubber-like insect cuticles were prepared. The main objective was to improve understanding on the role of chitin-binding domain on mechanical properties. Resilin is a rubber-like protein present in insects. The exon I (comprising 18 N-terminal elastic repeat units) together with or without the exon II (a typical cuticular chitin-binding domain) from the resilin gene CG15920 found in Drosophila melanogasterwere cloned and the encoded proteins were expressed as soluble products in Escherichia coli.Resilin-like protein with chitin-binding domain (designated as ResChBD) adsorbedin significant amount to chitin nanofiber surface andprotein-bound cuticle-like soft nanocomposites were formed. Although chitin bindingwas taking place only in proteinswith chitin-binding domain, the global mechanical behavior of the hydrated chitin-resilin nanocomposites was not so sensitive to this chitin-resilin interaction. In summary, chitin is an interesting material component with high potential as mechanical reinforcement in a variety of nanomaterials. The present study reports the genesisof novel chitin nanofibers and outlines the basic relationships between structure and properties for materials based on chitin. Future work should be directed towards both bio-inspired studies of the nanocomposite chitin structures in organisms, as well as the industrial applications of chitin waste from the food industry. Chitin nanofibers can strengthen the properties of materials, andprovide optical transparency as well as biological activities such as antimicrobial properties.

QC 20141110

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Chapitres de livres sur le sujet "HYDROGEL NANOFIBERS"

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Wang, Boyi, Yong Zhu, Vien Huynh, Md Ataur Rahman, Brian Hawkett, Sharath Sriram et Dzung Viet Dao. « Palladium Nanofiber Networks Hydrogen Sensor and Hydrogen-Actuated Switches ». Dans Sustainable Design and Manufacturing 2018, 116–25. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-04290-5_12.

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Yu, Tzu-Yi, Yun-Hsiu Tseng, Ming-Chung Wu, Cheng-Si Tsao et Wei-Fang Su. « Three-Dimensional Tomography of Cellulose Nanofibers- Polypeptides Nanocomposite Hydrogels ». Dans Springer Proceedings in Physics, 43–49. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92786-8_6.

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Han, Ling, Tae Ki Lim, Young Jun Kim, Hyun Sik Hahm et Myung Soo Kim. « Hydrogen Production by Catalytic Decomposition of Methane over Carbon Nanofibers ». Dans Materials Science Forum, 30–33. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-995-4.30.

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Gupta, Bipin Kumar, et O. N. Srivastava. « Investigations on the Carbon Special Form Graphitic Nanofibres as a Hydrogen Storage Materials ». Dans Hydrogen Materials Science and Chemistry of Carbon Nanomaterials, 177–84. Dordrecht : Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-2669-2_18.

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Lin, Jianlong, Wenjia Wu et Jingtao Wang. « Lamellar and Nanofiber-Based Proton Exchange Membranes for Hydrogen Fuel Cell ». Dans Functional Membranes for High Efficiency Molecule and Ion Transport, 167–217. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8155-5_5.

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Meng, Xiangling, David Stout, Linlin Sun, Hicham Fenniri et Thomas Webster. « Injectable Biomimetic Hydrogels with Carbon Nanofibers and Novel Self Assembled Chemistries for Myocardial Applications ». Dans Ceramic Transactions Series, 261–68. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118511466.ch25.

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Manoukian, Ohan S., Rita Matta, Justin Letendre, Paige Collins, Augustus D. Mazzocca et Sangamesh G. Kumbar. « Electrospun Nanofiber Scaffolds and Their Hydrogel Composites for the Engineering and Regeneration of Soft Tissues ». Dans Methods in Molecular Biology, 261–78. New York, NY : Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6840-4_18.

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Sharma, Hemlata J., et Subhash B. Kondawar. « Synthesis and characterization of SnO2/ polyaniline and al-doped SnO2/polyaniline composite nanofiber-based sensors for hydrogen gas sensing ». Dans Novel Applications in Polymers and Waste Management, 123–36. Toronto ; New Jersey : Apple Academic Press, 2018. : Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781315365848-7.

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Krasia-Christoforou, T. « Electrospinning of Multicomponent Hydrogels for Biomedical Applications ». Dans Multicomponent Hydrogels, 192–230. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837670055-00192.

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In recent years, electrospun hydrogel nanofibers have attracted considerable interest in the biomedical arena. In such nanomaterials, the exceptional properties including high surface-to-volume ratios, high porosity, improved mechanical performance and excellent tailorability in respect of their chemical composition and surface functionalization are combined with the 3D highly hydrated architectures of hydrogels. Consequently, researchers are focusing on the fabrication of electrospun multicomponent hydrogel nanofibers and their further evaluation in the biomedical field. In this chapter, an introductory section on electrospinning and its use in the production of biomaterials in the form of nanofibers is provided, followed by a description of the different fabrication pathways employed to generate electrospun multicomponent hydrogel nanofibers. Finally, the applicability of such nanomaterials in biomedical applications such as drug delivery, tissue engineering, wound healing and biosensing is reviewed.
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Padhiari, Sandip, Manamohan Tripathy et Garudadhwaj Hota. « Functionalized nanofibers for hydrogen storage and conversion ». Dans Functionalized Nanofibers, 689–717. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-99461-3.00004-2.

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Actes de conférences sur le sujet "HYDROGEL NANOFIBERS"

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Sadeghian, Ramin Banan, Samad Ahadian, Shin Yaginuma, Javier Ramon-Azcon, Xiaobin Liang, Ken Nakajima, Hitoshi Shiku, Tomokazu Matsue, Koji S. Nakayama et Ali Khademhosseini. « Metallic glass nanofibers in future hydrogel-based scaffolds ». Dans 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2014. http://dx.doi.org/10.1109/embc.2014.6944816.

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Serrano-Aroca, Ángel, Mar Llorens-Gámez et Beatriz Salesa. « Advanced hydrogel films of alginate/carbon nanofibers for biomedical applications ». Dans MOL2NET 2020, International Conference on Multidisciplinary Sciences, 6th edition. Basel, Switzerland : MDPI, 2020. http://dx.doi.org/10.3390/mol2net-06-06785.

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Niemann, Michael U., Sesha S. Srinivasan, Ayala R. Phani, Ashok Kumar, D. Yogi Goswami et Elias K. Stefanakos. « Hydrogen Sorption Behavior in Conducting Polymer Nanostructures ». Dans ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11554.

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Conducting polyaniline nanofibers were synthesized using chemical templating method followed by electrospun process. These nanofibers have been compared with their standard bulk counterpart and found to be stable up to 150°C. Polyaniline nanofibers prepared by electrospun method reveal high hydrogen uptake of 10wt.% at around 100°C in the first absorption run. However, in the consecutive hydrogenation and dehydrogenation cycles, the hydrogen capacity diminishes. This is most likely due to hydrogen loading into the polymer matrix, chemisorption and saturation effects. A reversible hydrogen storage capacity of ∼3–10 wt.% was also found in the new batch of electrospun nanofibers at different temperatures. The surface morphologies before and after hydrogen sorption of these PANI nanofibers encompass significant changes in the microstructure (nanofibrallar swelling effect) which clearly suggest effective hydrogen uptake and release.
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SAITA, I., T. TOSHIMA, S. TANDA et T. AKIYAMA. « NANOFIBERS OF HYDROGEN STORAGE ALLOY ». Dans Proceedings of the 1st International Symposium on TOP2005. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772879_0023.

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Kalantar-zadeh, K., A. Sadek, W. Wlodarski, Y. x. Li et X. f. Yu. « SAW Hydrogen Sensor with Electropolymerized Polyaniline Nanofibers ». Dans 2006 IEEE International Frequency Control Symposium and Exposition. IEEE, 2006. http://dx.doi.org/10.1109/freq.2006.275424.

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Yao, Shuzhi, Meng Jiang, Hui Gao, Yufei Zhang, Shoulin Jiang, Zihao Zhang, Yong Yang et Xuefeng Wang. « The research on hydrogen sensor based on nanofiber ». Dans Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, sous la direction de Shining Zhu, Qifeng Yu, Junhong Su, Lianghui Chen et Junhao Chu. SPIE, 2022. http://dx.doi.org/10.1117/12.2625209.

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Chen, Yuxuan, Xiuru Xu, Junqi Feng et Zhengchun Peng. « Self-adhesive, Transparent, Conductive Hydrogels from Electrospun Core-shell Nanofibers ». Dans 2023 6th International Conference on Electronics Technology (ICET). IEEE, 2023. http://dx.doi.org/10.1109/icet58434.2023.10211714.

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Bilgili, Hatice Kubra, Gunnur Onak et Ozan Karaman. « Development and Characterization of Nanofiber-Reinforced Hydrogel for Bone Regeneration ». Dans 2019 Medical Technologies Congress (TIPTEKNO). IEEE, 2019. http://dx.doi.org/10.1109/tiptekno.2019.8895003.

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Qiu, Weiguo, Arjun Stokes, Joseph Cappello et Xiaoyi Wu. « Electrospinning of Recombinant Protein Polymer Nanofibers ». Dans ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206352.

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Structural proteins often in the form of micro and nanofibers, constituting most of intra- and extracellular matrix (ECM), are the fundamental building blocks of life [1]. Recent efforts to replace diseased or damaged tissues and organs have resulted in the molecular design and genetic engineering of recombinant proteins, and the advent of new technology for fabricating structural proteins into micro-/nanofibrous scaffolds, hoping to resemble some or all the characteristics of ECM structure and function. The fabrication of such an ECM mimic may be an important step in engineering a functional tissue. To this end, we have produced a series of silk-elastin-like proteins (SELPs) [2]. Revealed by our subsequent studies, SELPs in the form of hydrogels, thin films, and microfibers, have displayed a set of outstanding biological and physical properties. In this study, electrospinning will be pursued as a mechanism for the formation of SELP nanofibers.
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Huang, Changfa, Xiuru Xu, Yuxuan Chen et ZhengChun Peng. « Electrospun Titanium Dioxide Nanofibers Reinforced Anti-freezing, Adhesive and Conductive Hydrogels ». Dans 2022 IEEE 5th International Conference on Electronics Technology (ICET). IEEE, 2022. http://dx.doi.org/10.1109/icet55676.2022.9824738.

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Rapports d'organisations sur le sujet "HYDROGEL NANOFIBERS"

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Skolnik, E. G. Hydrogen storage in carbon nanofibers as being studied by Northeastern University. Technical evaluation report. Office of Scientific and Technical Information (OSTI), juin 1997. http://dx.doi.org/10.2172/674688.

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