scholarly journals Research Progress of Chitosan-Based Biomimetic Materials

Marine Drugs ◽  
2021 ◽  
Vol 19 (7) ◽  
pp. 372
Author(s):  
Zhaoyu Zhang ◽  
Lingyu Zhang ◽  
Chengpeng Li ◽  
Xiangyu Xie ◽  
Guangfa Li ◽  
...  
Keyword(s):  
Wound Healing ◽  
Smart Materials ◽  
Matrix Material ◽  
Functional Materials ◽  
Honeycomb Structure ◽  
Research Progress ◽  
Biological Cell ◽  
Biomimetic Materials ◽  
Good Biocompatibility ◽  
Survival Of The Fittest

Chitosan is a linear polysaccharide produced by deacetylation of natural biopolymer chitin. Owing to its good biocompatibility and biodegradability, non-toxicity, and easy processing, it has been widely used in many fields. After billions of years of survival of the fittest, many organisms have already evolved a nearly perfect structure. This paper reviews the research status of biomimetic functional materials that use chitosan as a matrix material to mimic the biological characteristics of bivalves, biological cell matrices, desert beetles, and honeycomb structure of bees. In addition, the application of biomimetic materials in wound healing, hemostasis, drug delivery, and smart materials is briefly overviewed according to their characteristics of adhesion, hemostasis, release, and adsorption. It also discusses prospects for their application and provides a reference for further research and development.

A glance on rare earth oxides: importance, reserves, demand, applications, critical uncertainties, global economy, and zeta potential characterization

2020 ◽  
Vol 05 ◽  
Author(s):  
Silas Santos ◽  
Orlando Rodrigues ◽  
Letícia Campos
Keyword(s):  
Rare Earth ◽  
Zeta Potential ◽  
Sample Preparation ◽  
Rare Earths ◽  
Smart Materials ◽  
Global Economy ◽  
Materials Science ◽  
Functional Materials ◽  
Rare Earth Oxides ◽  
Interparticle Forces

Background: Innovation mission in materials science requires new approaches to form functional materials, wherein the concept of its formation begins in nano/micro scale. Rare earth oxides with general form (RE2O3; RE from La to Lu, including Sc and Y) exhibit particular proprieties, being used in a vast field of applications with high technological content since agriculture to astronomy. Despite of their applicability, there is a lack of studies on surface chemistry of rare earth oxides. Zeta potential determination provides key parameters to form smart materials by controlling interparticle forces, as well as their evolution during processing. This paper reports a study on zeta potential with emphasis for rare earth oxide nanoparticles. A brief overview on rare earths, as well as zeta potential, including sample preparation, measurement parameters, and the most common mistakes during this evaluation are reported. Methods: A brief overview on rare earths, including zeta potential, and interparticle forces are presented. A practical study on zeta potential of rare earth oxides - RE2O3 (RE as Y, Dy, Tm, Eu, and Ce) in aqueous media is reported. Moreover, sample preparation, measurement parameters, and common mistakes during this evaluation are discussed. Results: Potential zeta values depend on particle characteristics such as size, shape, density, and surface area. Besides, preparation of samples which involves electrolyte concentration and time for homogenization of suspensions are extremely valuable to get suitable results. Conclusion: Zeta potential evaluation provides key parameters to produce smart materials seeing that interparticle forces can be controlled. Even though zeta potential characterization is mature, investigations on rare earth oxides are very scarce. Therefore, this innovative paper is a valuable contribution on this field.

scholarly journals Self-regenerating giant hyaluronan polymer brushes

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Wenbin Wei ◽  
Jessica L. Faubel ◽  
Hemaa Selvakumar ◽  
Daniel T. Kovari ◽  
Joanna Tsao ◽  
...  
Keyword(s):  
Wound Healing ◽  
Polymer Brushes ◽  
Functional Materials ◽  
Polymer Physics ◽  
High Density ◽  
Hyaluronan Synthase ◽  
Dynamic Interface ◽  
Continuous Source

AbstractTailoring interfaces with polymer brushes is a commonly used strategy to create functional materials for numerous applications. Existing methods are limited in brush thickness, the ability to generate high-density brushes of biopolymers, and the potential for regeneration. Here we introduce a scheme to synthesize ultra-thick regenerating hyaluronan polymer brushes using hyaluronan synthase. The platform provides a dynamic interface with tunable brush heights that extend up to 20 microns – two orders of magnitude thicker than standard brushes. The brushes are easily sculpted into micropatterned landscapes by photo-deactivation of the enzyme. Further, they provide a continuous source of megadalton hyaluronan or they can be covalently-stabilized to the surface. Stabilized brushes exhibit superb resistance to biofilms, yet are locally digested by fibroblasts. This brush technology provides opportunities in a range of arenas including regenerating tailorable biointerfaces for implants, wound healing or lubrication as well as fundamental studies of the glycocalyx and polymer physics.

scholarly journals Strain- and field-induced anisotropy in hybrid elastomers with elongated filler nanoparticles

Soft Matter ◽  
2021 ◽  
Author(s):  
Julian Seifert ◽  
Damian Günzing ◽  
Samira Webers ◽  
Martin Dulle ◽  
Margarita Kruteva ◽  
...  
Keyword(s):  
Smart Materials ◽  
Functional Materials ◽  
Induced Anisotropy

The implementation of anisotropy to functional materials is a key step towards future smart materials. In this work, we evaluate the influence of preorientation and sample architecture on the strain-induced...

The Research Status of Self-Compensation Lubricating Composites at High Temperature

2013 ◽  
Vol 470 ◽  
pp. 108-111
Author(s):  
Ying Han ◽  
Yan Jun Wang ◽  
Shou Ren Wang
Keyword(s):  
High Temperature ◽  
Matrix Material ◽  
Research Progress ◽  
Lubrication Mechanism ◽  
Research Status

It is significant and necessary to carry out the development of self-compensation lubricating composites. In this paper, the current research of self-lubrication composites is summarized. The lubrication mechanism of the high temperature self-compensation lubricating composites is introduced and the research progress of matrix material and lubricant material of the composites is reviewed.

scholarly journals An Antimicrobial Peptide-Loaded Chitosan/Polyethylene Oxide Nanofibrous Membrane Fabricated by Electrospinning Technology

2021 ◽  
Vol 8 ◽  
Author(s):  
Ling Yu ◽  
Shubin Dou ◽  
Jinghan Ma ◽  
Qiang Gong ◽  
Mogen Zhang ◽  
...  
Keyword(s):  
Wound Healing ◽  
Polyethylene Oxide ◽  
Total Concentration ◽  
Average Diameter ◽  
Nanofiber Membrane ◽  
New Class ◽  
Intensity Changes ◽  
Good Biocompatibility ◽  
Nanofiber Membranes

Antimicrobial peptides (AMPs) are a new class of promising antibacterial agents. We prepared electrospinning chitosan (CS)-polyethylene oxide (PEO) nanofiber membranes containing different concentrations of an antibacterial peptide NP10. The average diameter of nanofibers increased with the total concentration of NP10. The FTIR shows that all the peaks of CS-PEO nanofiber membranes with different concentrations of NP10 were almost the same as those of pure CS-PEO nanofiber membranes, and only the peak intensity changes. Adding NP10 can improve the thermal stability of CS-PEO nanofiber membranes. In the in vitro release experiment, NP10 was released from the CS-PEO-0.5%NP10 nanofiber membrane in a burst first and then slowly and continuously. Simultaneously, the CS-PEO-NP10 nanofiber membrane had good antibacterial activity against Escherichia coli and Staphylococcus aureus and good biocompatibility. In animal wound healing experiments, CS-PEO-0.5%NP10 nanofiber membrane had advantages over gauze and CS-PEO nanofiber membrane in wound healing. These properties may provide a choice for the clinical application of AMPs and treatment of wound infections.

Fabrication of the graphene honeycomb structure as a scaffold for the study of cell growth

2018 ◽  
Vol 42 (8) ◽  
pp. 6299-6304 ◽  
Author(s):  
Shengyan Yin ◽  
Peng Chen ◽  
Hang Sun ◽  
Kai Sun ◽  
Yilun Wu ◽  
...  
Keyword(s):  
Cell Growth ◽  
Cell Lines ◽  
Honeycomb Structure ◽  
Good Biocompatibility ◽  
Mcf 7

The good biocompatibility of the graphene honeycomb structure was evaluated by the proliferation of HeLa and MCF-7 cell lines.

Ascorbic acid in the normal and regenerating tail of the house lizard, Hemidactylus flaviviridis

Development ◽  
1971 ◽  
Vol 26 (2) ◽  
pp. 285-293
Author(s):  
R. V. Shah ◽  
P. K. Hiradhar ◽  
D. K. Magon
Keyword(s):  
Wound Healing ◽  
Ascorbic Acid ◽  
Matrix Material ◽  
Growth Period ◽  
Tail Regeneration ◽  
The Matrix ◽  
Metabolic Activities ◽  
Vitamin Level ◽  
Hemidactylus Flaviviridis

The concentration of ascorbic acid (AA) and the histochemical distribution of the vitamin in the normal and regenerating tail of the gekkonid lizard, Hemidactylus flaviviridis, have been investigated. In the regenerating tail of the lizard the AA concentration almost doubles during wound healing and becomes fivefold during differentiation. However, it falls almost to the normal level during the blastema phase (i.e. period between wound healing and differentiation). Again, during the growth period (i.e. after differentiation) the AA concentration gradually becomes reduced, reaching the normal mark as the regenerate regains the full length of the original tail. Nevertheless, the vitamin level does not fall below the normal mark at any stage of regeneration. Increase of ascorbic acid during wound healing is thought to be mainly due to increased demand for the vitamin at the broken ends of the stump tissues, for their repair and formation of wound epithelium; the vitamin is known to help these processes. A fivefold increase of the vitamin during the differentiation period corresponds to an increased pace of laying down of the matrix material for the connective tissues, suggesting the role of ascorbic acid in the formation of collagen and mucopolysaccharides. Besides, the role of ascorbic acid in lipid and carbohydrate metabolism is also important during tail regeneration. Fluctuations in the vitamin level during different phases of tail regeneration are correlated with various states of metabolic activities of the corresponding phases.

scholarly journals Functional Materials Produced On An Industrial Scale

2015 ◽  
Vol 36 (1) ◽  
pp. 19-30
Author(s):  
Justyna Barska ◽  
Sylwester Kłysz
Keyword(s):  
Smart Materials ◽  
Industrial Production ◽  
Functional Materials ◽  
Industrial Scale ◽  
Wide Range ◽  
Basic Characteristics

AbstractThe article presents a wide range of applications of functional materials and a scale of their current industrial production. These are the materials which have specific characteristics, thanks to which they became virtually indispensable in certain constructional solutions. Their basic characteristics, properties, methods of production and use as smart materials were described.

Vascularized Multi-Functional Materials and Structures

2008 ◽  
Vol 47-50 ◽  
pp. 511-514 ◽  
Author(s):  
Adrian Bejan ◽  
Sylvie Lorente
Keyword(s):  
Mechanical Strength ◽  
Smart Materials ◽  
Functional Materials ◽  
Constructal Theory ◽  
Self Healing ◽  
Length Scales ◽  
Embedded Grids ◽  
Volumetric Cooling ◽  
Parallel Microchannels ◽  
The Right

Here we draw attention to the development of smart materials with embedded vasculatures that provide multiple functionality: volumetric cooling, self-healing, mechanical strength, etc. Vascularization is achieved by using tree-shaped (dendritic) and grid-shaped flow architectures. As length scales become smaller, dendritic vascularization provides dramatically superior volumetric bathing and transport properties than the use of bundles of parallel microchannels. Embedded grids of channels provide substantially better volumetric bathing when the channels have multiple diameters that are selected optimally and put in the right places. Two novel dendritic architectures are proposed: trees matched canopy to canopy, and trees that alternate with upside down trees. Both have optimized length scales and layouts. Flow architectures are derived from principle, in accordance with constructal theory, not by mimicking nature.

scholarly journals Preparation of Nanofibers with Renewable Polymers and Their Application in Wound Dressing

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Ying Zhao ◽  
Yihui Qiu ◽  
Huanhuan Wang ◽  
Yu Chen ◽  
Shaohua Jin ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Wound Healing ◽  
Cell Adhesion ◽  
Specific Surface ◽  
Wound Dressing ◽  
Recent Progress ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Renewable Polymers ◽  
Good Biocompatibility

Renewable polymers have attracted considerable attentions in the last two decades, predominantly due to their environmentally friendly properties, renewability, good biocompatibility, biodegradability, bioactivity, and modifiability. The nanofibers prepared from the renewable polymers can combine the excellent properties of the renewable polymer and nanofiber, such as high specific surface area, high porosity, excellent performances in cell adhesion, migration, proliferation, differentiation, and the analogous physical properties of extracellular matrix. They have been widely used in the fields of wound dressing to promote the wound healing, hemostasis, skin regeneration, and treatment of diabetic ulcers. In the present review, the different methods to prepare the nanofibers from the renewable polymers were introduced. Then the recent progress on preparation and properties of the nanofibers from different renewable polymers or their composites were reviewed; the application of them in the fields of wound dressing was emphasized.

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