Journal articles: 'Self-assembled fibrous network'

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Włodarczyk-Biegun, Małgorzata K., Cornelis J. Slingerland, Marc W. T. Werten, Ilse A. van Hees, Frits A. de Wolf, Renko de Vries, Martien A. Cohen Stuart, and Marleen Kamperman. "Heparin as a Bundler in a Self-Assembled Fibrous Network of Functionalized Protein-Based Polymers." Biomacromolecules 17, no. 6 (May 23, 2016): 2063–72. http://dx.doi.org/10.1021/acs.biomac.6b00276.

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Bag, Braja Gopal, and Shaishab Kumar Dinda. "Arjunolic acid: A renewable template in supramolecular chemistry and nanoscience." Pure and Applied Chemistry 79, no. 11 (January 1, 2007): 2031–38. http://dx.doi.org/10.1351/pac200779112031.

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Arjunolic acid, a triterpenoid, renewably resourced from Terminalia arjuna sawdust, has the potential of being used as a structural molecular framework in supramolecular chemistry and nanoscience. The nanosized chiral triterpenoid on derivatization could immobilize varieties of organic solvents at low concentrations. The low-molecular-mass organic compounds self-assembled in organic media to form fibrous network structures having fibers of nano- to micrometer diameters. A dual-component supramolecular gelation has been demonstrated, exhibiting interesting thermochromic property. An arjunolic acid-derived crown ether showed efficient binding to monovalent cations, including a primary ammonium ion paving the way for chiral recognition of amino acids.

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Tétreault, Nicolas, Endre Horváth, Thomas Moehl, Jérémie Brillet, Rita Smajda, Stéphane Bungener, Ning Cai, et al. "High-Efficiency Solid-State Dye-Sensitized Solar Cells: Fast Charge Extraction through Self-Assembled 3D Fibrous Network of Crystalline TiO2 Nanowires." ACS Nano 4, no. 12 (November 17, 2010): 7644–50. http://dx.doi.org/10.1021/nn1024434.

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Song, Xuan, Zhiwei Wang, Shiyu Tao, Guixia Li, and Jie Zhu. "Observing Effects of Calcium/Magnesium Ions and pH Value on the Self-Assembly of Extracted Swine Tendon Collagen by Atomic Force Microscopy." Journal of Food Quality 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/9257060.

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Self-assembly of extracted collagen from swine trotter tendon under different conditions was firstly observed using atomic force microscopy; then the effects of collagen concentration, pH value, and metal ions to the topography of the collagen assembly were analyzed with the height images and section analysis data. Collagen assembly under 0.1 M, 0.2 M, 0.3 M CaCl2, and MgCl2 solutions in different pH values showed significant differences (P < 0.05) in the topographical properties including height, width, and roughness. With the concentration being increased, the width of collagen decreased significantly (P < 0.05). The width of collagen fibers was first increased significantly (P < 0.05) and then decreased with the increasing of pH. The collagen was assembled with network structure on the mica in solution with Ca2+ ions. However, it had shown uniformed fibrous structure with Mg2+ ions on the new cleaved mica sheet. In addition, the width of collagen fibrous was 31~58 nm in solution with Mg2+ but 21~50 nm in Ca2+ solution. The self-assembly collagen displayed various potential abilities to construct fibers or membrane on mica surfaces with Ca2+ ions and Mg2+ irons. Besides, the result of collagen self-assembly had shown more relations among solution pH value, metal ions, and collagen molecular concentration, which will provide useful information on the control of collagen self-assembly in tissue engineering and food packaging engineering.

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Sinko, Robert, and Sinan Keten. "Understanding emergent functions in self-assembled fibrous networks." Nanotechnology 26, no. 35 (August 12, 2015): 352501. http://dx.doi.org/10.1088/0957-4484/26/35/352501.

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Ryan, Kate, Jason Beirne, Gareth Redmond, Jason I. Kilpatrick, Jill Guyonnet, Nicolae-Viorel Buchete, Andrei L. Kholkin, and Brian J. Rodriguez. "Nanoscale Piezoelectric Properties of Self-Assembled Fmoc–FF Peptide Fibrous Networks." ACS Applied Materials & Interfaces 7, no. 23 (June 3, 2015): 12702–7. http://dx.doi.org/10.1021/acsami.5b01251.

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Gong, Chaoyang, Zhen Qiao, Song Zhu, Wenjie Wang, and Yu-Cheng Chen. "Self-Assembled Biophotonic Lasing Network Driven by Amyloid Fibrils in Microcavities." ACS Nano 15, no. 9 (September 17, 2021): 15007–16. http://dx.doi.org/10.1021/acsnano.1c05266.

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Zhang, Shichao, Hui Liu, Ning Tang, Nadir Ali, Jianyong Yu, and Bin Ding. "Highly Efficient, Transparent, and Multifunctional Air Filters Using Self-Assembled 2D Nanoarchitectured Fibrous Networks." ACS Nano 13, no. 11 (October 30, 2019): 13501–12. http://dx.doi.org/10.1021/acsnano.9b07293.

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Swanekamp, Ria J., Jade J. Welch, and Bradley L. Nilsson. "Proteolytic stability of amphipathic peptide hydrogels composed of self-assembled pleated β-sheet or coassembled rippled β-sheet fibrils." Chem. Commun. 50, no. 70 (2014): 10133–36. http://dx.doi.org/10.1039/c4cc04644g.

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Hydrogel networks composed of rippled β-sheet fibrils of coassembled d- and l-Ac-(FKFE)₂-NH₂ amphipathic peptides exhibit proteolytic stability and increased rheological strength compared to networks of self-assembled l-Ac-(FKFE)₂-NH₂ pleated β-sheet fibrils.

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Dasgupta, Debarshi, Zakaria Kamar, Cyrille Rochas, Mohammed Dahmani, Philippe Mesini, and Jean Michel Guenet. "Design of hybrid networks by sheathing polymer fibrils with self-assembled nanotubules." Soft Matter 6, no. 15 (2010): 3573. http://dx.doi.org/10.1039/b923282f.

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Hamedi, Mahiar, Anna Herland, Roger H. Karlsson, and Olle Inganäs. "Electrochemical Devices Made from Conducting Nanowire Networks Self-Assembled from Amyloid Fibrils and Alkoxysulfonate PEDOT." Nano Letters 8, no. 6 (June 2008): 1736–40. http://dx.doi.org/10.1021/nl0808233.

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Wang, Zhiwei, Qi Xiao, Xuan Song, Yunfei Wan, and Jie Zhu. "Cation-Specific Effects on the Self-Assembly of Collagen Molecules Mediated by Acetate on Mica Surface Observed with Atomic Force Microscopy." Journal of Food Quality 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/1692975.

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The well-organized collagen layers on mica surface have drawn extensive attention for its essential applications and studies on the process of self-assembly as a model system. In this work, collagen extracted from fish scales by acid-base method was used to explore the self-assembly characters, and atomic force microscopy was applied to observe the collagen assembled on mica surface mediated by acetate with four different cations, including K+, Na+, Mg2+, and Ca2+. It showed that cations might influence the interaction between collagen fibrils and mica surface at high ionic concentration. And a similar network structure was acquired with uniform pore size for four kinds of acetates; nearly ranged collagen fibrils in the same direction were collected in Mg2+ solutions, while flat films with some fibrils were achieved in K+ solutions. The Hofmeister series and Collins’ model were adapted to explain the effects of cations and acetate on the self-assembly of collagen. These results and analysis would be helpful for directing the pattern of collagen assembly on a solid surface with a potential application in food science and engineering.

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Haino, Takeharu, and Hiroshi Saito. "Photoresponsive Organogel Based on Supramolecular Assembly of Tris(phenylisoxazolyl)benzene." Australian Journal of Chemistry 63, no. 4 (2010): 640. http://dx.doi.org/10.1071/ch09653.

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Azobenzene-substituted tris(phenylisoxazolyl)benzene 1 was developed as a photoresponsive gelator. A detailed study of the self-assembly of the trans- and cis-isomers in solution revealed that the planar trans-isomer assembled to form molecular stacks along its C 3 axis, whereas the cis-isomer did not owing to steric requirements. Based on diffusion ordered spectroscopy experiments, the size of the aggregates formed from the trans-isomer were roughly four times as large as those of the cis-isomer. The photoinduced gel-to-sol transition was achieved by irradiation with UV light at 360 nm. Solid-state morphologies of the trans- and cis-isomers were quite contrastive; the trans-isomer created fibrous supramolecular networks with a lot of voids in which solvent molecules could be immobilized, whereas the cis-isomer never created such fibrous morphologies. The trans–cis structural change of the azobenzene moieties obviously regulates the gelation ability of 1.

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He, Lan, Wang, Ahmed, and Liu. "Extraction and Characterization of Self-Assembled Collagen Isolated from Grass Carp and Crucian Carp." Foods 8, no. 9 (September 6, 2019): 396. http://dx.doi.org/10.3390/foods8090396.

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Collagens were extracted from grass carp skin (GCC), grass carp scales (GSC), and crucian carp skin (CCC) using an acid-enzyme combination method, and their characteristics and self-assembly properties were analyzed. Electrophoretic patterns characterized all three as type I collagens. An ultraviolet analysis identified the optimal wavelengths for collagen detection, while a Fourier transform infrared spectroscopy analysis confirmed the triple-helical structure of the collagens. The GCC, GSC, and CCC had denaturation temperatures of 39.75, 34.49, and 39.05 °C, respectively. All three were shown to self-assemble into fibrils at 30 °C in the presence of NaCl, but the fibril formation rate of CCC (40%) was slightly higher than those of GCC (28%) and GSC (27%). The GSC were shown to form a more strongly intertwined fibril network with a characteristic D-periodicity. The fish collagens extracted in this study have potential applications in the development of functionalized materials.

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Yang, Yih-Pey, and Chia-Chi Lin. "MORPHOLOGY OF ADSORBED COLLAGEN LAYERS OBSERVED BY ATOMIC FORCE MICROSCOPY." Biomedical Engineering: Applications, Basis and Communications 21, no. 05 (October 2009): 311–16. http://dx.doi.org/10.4015/s1016237209001398.

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The interaction between cells and biomaterials strongly depends on the assembled structure of collagen adsorption upon the solid surface. Due to its self-assembling property, Type I collagen may aggregate and form fibrils in vivo and in vitro. This study utilizes an atomic force microscope to investigate nanometer-scale organization of adsorbed Type I collagen layers on mica and on poly(methyl methacrylate) (PMMA). We have observed various film morphologies, depending on substrate hydrophobicity and the state of collagen solution used. On mica, the atomic force microscopy (AFM) study obtains dense felt-like structures of randomly distributed assemblies. Images of network-like assemblies composed of interwoven fibrils appear on PMMA. According to the above results, we believe that these assemblies are associated at the interface rather than aggregated in the solution. This work also investigates the adsorbed collagen structure on PMMA after collagen aggregation in solution, to realize the relation between adsorption and aggregation. Consequently, the result exhibits a dendritic fibrillar structure adsorbed on PMMA, following collagen molecule aggregation, to form a fibrillar structure in the solution. This result suggests that the adsorption of aggregates preformed in the solution is preferable to collagen molecules adsorption. This research created all assembled structures of adsorbed collagen layers in nanometer-scale thickness.

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Lu, Shenzhou, Zhuangzhuang Wen, Zhuping Yin, Dajiang Kuang, and Tieling Xing. "Study on silk fibroin nanofibers with long length." Modern Physics Letters B 33, no. 17 (June 18, 2019): 1950194. http://dx.doi.org/10.1142/s021798491950194x.

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Aqueous silk fibroin (SF) sol is a colloidal solution. With the colloidal hydration layer and electrostatic repulsion, the SF sol can hardly make the efficient collision/assembly among micelles and perform like a following sol for a long time. In this paper, hydrophilic silk-based sequences (HSF) derived from SF molecules were obtained by immersing the dried SF condensates with water and extracting the dissolving fraction. The HSF was obtained by immersing the SF condensate dried at the temperature of [Formula: see text]–[Formula: see text] and relative humid of 55–60% in water and collected the lixivium. The dissolving ratio was about 30%. The HSF sol (0.5%, w/v) self-assembled into the mesoscopic 3D nanofibrous network within 8 h. The obtained HSF nanofibers were 10–100 [Formula: see text] in length and 50–100 nm in diameter. The HSF nanofiber possesses similar hierarchical structure consisting of nanofibrils bundles to the native silk fiber. There were significant aggregation structure transitions from random coil to [Formula: see text]-sheet and amorphous chains to Silk II crystal aggregation during the formation of HSF nanofibers. The HSF nanofiber holds the potential to give further insight into the reconstruction of native silk in vitro and the fabrication of tough silk-based biomaterials.

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Bharmoria, Pankaj, Nobuhiro Yanai, and Nobuo Kimizuka. "Recent Progress in Photon Upconverting Gels." Gels 5, no. 1 (March 26, 2019): 18. http://dx.doi.org/10.3390/gels5010018.

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Recent progress in the development of gels showing triplet-triplet annihilation based photon upconversion (TTA-UC) is reviewed. Among the two families of upconverting gels reported, those display TTA-UC based on molecular diffusion show performances comparable to those in solutions, and the TTA-UC therein are affected by dissolved molecular oxygen. Meanwhile, air-stable TTA-UC is achieved in organogels and hydrogels by suitably accumulating TTA-UC chromophores which are stabilized by hydrogen bonding networks of the gelators. The unique feature of the air-stable upconverting gels is that the self-assembled nanostructures are protected from molecular oxygen dissolved in the microscopically interconnected solution phase. The presence of the bicontinuous structures formed by the upconverting fibrous nanoassemblies and the solution phase is utilized to design photochemical reaction systems induced by TTA-UC. Future challenges include in vivo applications of hydrogels showing near infrared-to-visible TTA-UC.

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Ye, Zhou, Joseph R. Rahimi, Nicholas G. Fischer, Hooi Pin Chew, and Conrado Aparicio. "4138 Development of an Antibiofilm Resorbable Membrane for Treating Peri-implantitis." Journal of Clinical and Translational Science 4, s1 (June 2020): 121. http://dx.doi.org/10.1017/cts.2020.364.

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OBJECTIVES/GOALS: Peri-implantitis is the inflammation of peri-implant mucosa and subsequent loss of supporting bone. Its treatment is only <40% successful mainly due to persistent bacterial infection. The goal of this project is to increase success rates by developing a robust antibiofilm multi-biomolecular membrane that can be placed around implant surfaces. METHODS/STUDY POPULATION: A collagen membrane was soaked in the antimicrobial peptide GL13K solution overnight to form an interpenetrating fibrillary network. The nanostructure of the membrane was imaged with scanning electron microscope (SEM). The hydrophobicity of the membrane was analyzed by water contact angle (WCA) measurements. The biodegradability was tested in a 0.01 mg/mL Type I collagenase solution for up to 5 weeks. The antimicrobial activity of the membrane was assessed with Gram-positive oral bacteria Streptococcus gordonii. The cytotoxicity was evaluated by culturing human gingival fibroblasts (HGF), and the osteogenesis was assessed using preosteoblasts MC3T3. Pure collagen membrane was used as the control. Statistical significance (p<0.05) was determined by one-way ANOVA with Tukey’s HSD test. RESULTS/ANTICIPATED RESULTS: The antimicrobial peptide GL13K self-assembled to short fibrils (< 1 µm long), which entangled with the larger collagen fibers (around 200 nm in diameter). The collagen fibers presented characteristic periodic banding structures, which provided biomimetic cues for cell behavior as extracellular matrix. The interpenetrated GL13K fibrils turned the highly hydrophilic collagen membrane to a hydrophobic membrane (WCA = 135 °) and significantly reduced the rate of degradation by collagenases. The developed membrane was efficient in preventing the attachment of S. gordonii. A large portion of the attached bacteria was killed on the surface of the membrane. The incorporation of GL13K did not affect the cytocompatibility of the membrane for HGF. DISCUSSION/SIGNIFICANCE OF IMPACT: We developed an antibiofilm membrane with interpenetrating collagen and antimicrobial peptide fibrils. The strong antimicrobial activity and low cytotoxicity support its further translational evaluation as scaffolds for increasing success rate in treating peri-implantitis.

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Goulielmos, G., F. Gounari, S. Remington, S. Müller, M. Häner, U. Aebi, and S. D. Georgatos. "Filensin and phakinin form a novel type of beaded intermediate filaments and coassemble de novo in cultured cells." Journal of Cell Biology 132, no. 4 (February 15, 1996): 643–55. http://dx.doi.org/10.1083/jcb.132.4.643.

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The fiber cells of the eye lens possess a unique cytoskeletal system known as the "beaded-chain filaments" (BFs). BFs consist of filensin and phakinin, two recently characterized intermediate filament (IF) proteins. To examine the organization and the assembly of these heteropolymeric IFs, we have performed a series of in vitro polymerization studies and transfection experiments. Filaments assembled from purified filensin and phakinin exhibit the characteristic 19-21-nm periodicity seen in many types of IFs upon low angle rotary shadowing. However, quantitative mass-per-length (MPL) measurements indicate that filensin/phakinin filaments comprise two distinct and dissociable components: a core filament and a peripheral filament moiety. Consistent with a nonuniform organization, visualization of unfixed and unstained specimens by scanning transmission electron microscopy (STEM) reveals the the existence of a central filament which is decorated by regularly spaced 12-15-nm-diam beads. Our data suggest that the filamentous core is composed of phakinin, which exhibits a tendency to self-assemble into filament bundles, whereas the beads contain filensin/phakinin hetero-oligomers. Filensin and phakinin copolymerize and form filamentous structures when expressed transiently in cultured cells. Experiments in IF-free SW13 cells reveal that coassembly of the lens-specific proteins in vivo does not require a preexisting IF system. In epithelial MCF-7 cells de novo forming filaments appear to grow from distinct foci and organize as thick, fibrous laminae which line the plasma membrane and the nuclear envelope. However, filament assembly in CHO and SV40-transformed lens-epithelial cells (both of which are fibroblast-like) yields radial networks which codistribute with the endogenous vimentin IFs. These observations document that the filaments formed by lens-specific IF proteins are structurally distinct from ordinary cytoplasmic IFs. Furthermore, the results suggest that the spatial arrangement of filensin/phakinin filaments in vivo is subject to regulation by host-specific factors. These factors may involve cytoskeletal networks (e.g., vimentin IFs) and/or specific sites associated with the cellular membranes.

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Fan, Linpeng, Jing-Liang Li, Zengxiao Cai, and Xungai Wang. "Bioactive hierarchical silk fibers created by bioinspired self-assembly." Nature Communications 12, no. 1 (April 22, 2021). http://dx.doi.org/10.1038/s41467-021-22673-4.

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AbstractArtificial recapitulation of the hierarchy of natural protein fibers is crucial to providing strategies for developing advanced fibrous materials. However, it is challenging due to the complexity of the natural environment. Inspired by the liquid crystalline spinning of spiders, we report the development of natural silk-like hierarchical fibers, with bundles of nanofibrils aligned in their long-axis direction, by self-assembly of crystallized silk fibroin (SF) droplets. The formation of self-assembled SF fibers is a process of coalesced droplets sprouting to form a branched fibrous network, which is similar to the development of capillaries in our body. The as-assembled hierarchical SF fibers are highly bioactive and can significantly enhance the spreading and growth of human umbilical vein endothelial cells compared to the natural SF fibers. This work could help to understand the natural silk spinning process of spiders and provides a strategy for design and development of advanced fibrous biomaterials for various applications.

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Prasad, Yadavali Siva, Sandeep Miryala, Krishnamoorthy Lalitha, Balasubramani Saritha, C. Uma Maheswari, Vellaisamy Sridharan, C. S. Srinandan, and Subbiah Nagarajan. "An injectable self-healing anesthetic glycolipid-based oleogel with antibiofilm and diabetic wound skin repair properties." Scientific Reports 10, no. 1 (October 22, 2020). http://dx.doi.org/10.1038/s41598-020-73708-7.

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Abstract Globally, wound infections are considered as one of the major healthcare problems owing to the delayed healing process in diabetic patients and microbial contamination. Thus, the development of advanced materials for wound skin repair is of great research interest. Even though several biomaterials were identified as wound healing agents, gel-based scaffolds derived from either polymer or small molecules have displayed promising wound closure mechanism. Herein, for the first time, we report an injectable and self-healing self-assembled anesthetic oleogel derived from glycolipid, which exhibits antibiofilm and wound closure performance in diabetic rat. Glycolipid derived by the reaction of hydrophobic vinyl ester with α-chloralose in the presence of novozyme 435 undergoes spontaneous self-assembly in paraffin oil furnished an oleogel displaying self-healing behavior. In addition, we have prepared composite gel by encapsulating curcumin in the 3D fibrous network of oleogel. More interestingly, glycolipid in its native form demoed potential in disassembling methicillin-resistant Staphylococcus aureus, methicillin-susceptible Staphylococcus aureus, and Pseudomonas aeruginosa biofilms. Both oleogel and composite gel enhanced the wound skin repair in diabetic induced Wistar rats by promoting collagen synthesis, controlling free radical generation and further regulating tissue remodeling phases. Altogether, the reported supramolecular self-assembled anesthetic glycolipid could be potentially used for diabetic skin wound repair and to treat bacterial biofilm related infections.

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Ng, Dickon H. L., and Jia Li. "Biomorphic Mesoporous Ce1−xZrxO2 Nanostructures Fabricated from Paper Templates." MRS Proceedings 1094 (2008). http://dx.doi.org/10.1557/proc-1094-dd07-11.

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AbstractA simple and versatile procedure was developed for synthesizing biomorphic mesoporous Ce1-xZrxO2. Aqueous cerium nitrate and zirconium nitrate solutions, and paper were used as the starting materials. Under the structure-directed effect offered by the active hydroxyl radicals of the cellulose in the paper templates, porous and fibrous structures of paper were replicated by the self-assembly of Ce1-xZrxO2 nanocrystallites after the paper underwent chemical infiltration and calcinations. The product, composing of interwoven network of fibers with diameter ranging from 10 to 20 <mu>m, was a replica of the original paper structure only that each fiber was assembled by Ce1-xZrxO2 nanocrystallites with grain size of 3-10 nm. The templating function of cellulose and the mechanism in the formation of nanocrystallites were proposed.

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Berglund, Jennie, Deirdre Mikkelsen, Bernadine M. Flanagan, Sushil Dhital, Stefan Gaunitz, Gunnar Henriksson, Mikael E. Lindström, Gleb E. Yakubov, Michael J. Gidley, and Francisco Vilaplana. "Wood hemicelluloses exert distinct biomechanical contributions to cellulose fibrillar networks." Nature Communications 11, no. 1 (September 17, 2020). http://dx.doi.org/10.1038/s41467-020-18390-z.

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Abstract Hemicelluloses, a family of heterogeneous polysaccharides with complex molecular structures, constitute a fundamental component of lignocellulosic biomass. However, the contribution of each hemicellulose type to the mechanical properties of secondary plant cell walls remains elusive. Here we homogeneously incorporate different combinations of extracted and purified hemicelluloses (xylans and glucomannans) from softwood and hardwood species into self-assembled networks during cellulose biosynthesis in a bacterial model, without altering the morphology and the crystallinity of the cellulose bundles. These composite hydrogels can be therefore envisioned as models of secondary plant cell walls prior to lignification. The incorporated hemicelluloses exhibit both a rigid phase having close interactions with cellulose, together with a flexible phase contributing to the multiscale architecture of the bacterial cellulose hydrogels. The wood hemicelluloses exhibit distinct biomechanical contributions, with glucomannans increasing the elastic modulus in compression, and xylans contributing to a dramatic increase of the elongation at break under tension. These diverging effects cannot be explained solely from the nature of their direct interactions with cellulose, but can be related to the distinct molecular structure of wood xylans and mannans, the multiphase architecture of the hydrogels and the aggregative effects amongst hemicellulose-coated fibrils. Our study contributes to understanding the specific roles of wood xylans and glucomannans in the biomechanical integrity of secondary cell walls in tension and compression and has significance for the development of lignocellulosic materials with controlled assembly and tailored mechanical properties.

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Journal articles on the topic 'Self-assembled fibrous network'

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