scholarly journals Towards the development of multifunctional hybrid fibrillary gels: production and optimization by colloidal electrospinning

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 48972-48979 ◽  
Author(s):  
Jaime Faria ◽  
Coro Echeverria ◽  
João P. Borges ◽  
Maria H. Godinho ◽  
Paula I. P. Soares
Keyword(s):  
Biomedical Applications ◽  
Active Sites ◽  
Polymeric Fibers ◽  
Thermosensitive Microgels ◽  
Highly Porous

The incorporation of thermosensitive microgels that can act as active sites into polymeric fibers through colloidal electrospinning originates multifunctional, highly porous, and biocompatible membranes suitable for biomedical applications.

scholarly journals Topographical and Biomechanical Guidance of Electrospun Fibers for Biomedical Applications

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2896
Author(s):  
Sara Ferraris ◽  
Silvia Spriano ◽  
Alessandro Calogero Scalia ◽  
Andrea Cochis ◽  
Lia Rimondini ◽  
...  
Keyword(s):  
Surface Modification ◽  
Biomedical Applications ◽  
Biomedical Application ◽  
Electrospun Fibers ◽  
Natural Polymers ◽  
Polymeric Fibers ◽  
Biological Phenomena ◽  
Proper Design ◽  
Synthetic And Natural Polymers ◽  
Selection Of

Electrospinning is gaining increasing interest in the biomedical field as an eco-friendly and economic technique for production of random and oriented polymeric fibers. The aim of this review was to give an overview of electrospinning potentialities in the production of fibers for biomedical applications with a focus on the possibility to combine biomechanical and topographical stimuli. In fact, selection of the polymer and the eventual surface modification of the fibers allow selection of the proper chemical/biological signal to be administered to the cells. Moreover, a proper design of fiber orientation, dimension, and topography can give the opportunity to drive cell growth also from a spatial standpoint. At this purpose, the review contains a first introduction on potentialities of electrospinning for the obtainment of random and oriented fibers both with synthetic and natural polymers. The biological phenomena which can be guided and promoted by fibers composition and topography are in depth investigated and discussed in the second section of the paper. Finally, the recent strategies developed in the scientific community for the realization of electrospun fibers and for their surface modification for biomedical application are presented and discussed in the last section.

scholarly journals Cost-Effective Fabrication, Antibacterial Application and Cell Viability Studies of Modified Nonwoven Cotton Fabric

2021 ◽  
Author(s):  
Rahat Nawaz ◽  
Sayed Tayyab Raza Naqvi ◽  
Batool Fatima ◽  
Nazia Zulfiqar ◽  
Muhammad Umer Farooq ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Biomedical Applications ◽  
Active Sites ◽  
Food Packaging ◽  
Low Cost ◽  
Bacterial Species ◽  
Enterobacter Aerogenes ◽  
Cost Effective ◽  
Bacterial Strains ◽  
Toxicity Assay

Abstract Nonwoven cotton fabric has been fabricated and designed for antibacterial applications using low cost and ecofriendly precursors. The treatment of fabric with alkali leads to formation of active sites. The surfaces were dip coated with silver nanaoparticles and chitosan. The surface was chlorinated in next step to transform amide (N-H) groups in chitosan into N-halamine (N-Cl). The modified and unmodified surfaces of the nonwoven cotton fabric have been characterized by FTIR, SEM, and XRD. The active chlorine loading is measured with iodine/ sodium thiosulphate. The antimicrobial activity and cell toxicity assay were carried out with and without modifications of nonwoven cotton fabric. The antimicrobial efficacies of loaded fabric were evaluated against four bacterial species (Micrococcus lutes, Staphylococcus aurea, Enterobacter aerogenes, and E.coli). It was found that modified fabric exhibited superior efficiency against gram-positive and gram-negative bacterial strains as compared to their bulk counterparts upon exposure without destroying and affecting fabric nature. The overall process is economical for commercial purposes. The modified fabric can be used for antimicrobial, health, and food packaging industries, and in other biomedical applications.

Constructing Ni–Mo2C Nanohybrids Anchoring on Highly Porous Carbon Nanotubes as Efficient Multifunctional Electrocatalysts

NANO ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. 2050135
Author(s):  
Penglun Zheng ◽  
Quanyi Liu ◽  
Xiaoliang Peng ◽  
Laiquan Li ◽  
Jun Yang
Keyword(s):  
Carbon Nanotubes ◽  
Active Sites ◽  
Reduction Reaction ◽  
Annealing Process ◽  
Interfacial Effect ◽  
Ni Nanoparticles ◽  
Novel Strategy ◽  
Highly Porous ◽  
Nonprecious Metal ◽  
Better Than

It is important for regenerative fuel cells, rechargeable metal–air batteries and water splitting to find reasonable designed nonprecious metal catalysts, which have efficient and durable electrocatalytic activities for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this work, through a simple hydrothermal method and following annealing process, Mo2C and Ni nanoparticles were encapsulated in a nanoporous hierarchical structure of carbon (Ni/Mo2C/C). The ingenious structure delivers several favorable characteristics including abundant active sites resulting from hollow and mesoporous architecture, boosted reaction kinetics from metallic components, sufficient interfacial effect and synergistic effect from intimate integration of Mo2C, Ni and C. The multifunctional Ni/Mo2C/C hybrid electrocatalyst performs excellently for ORR, OER and HER, better than most of the reported electrocatalysts with three functions. A facile and novel strategy was developed to construct the multifunctional catalysts with excellent electrocatalysis behavior.

scholarly journals Spectroscopic and modeling analyses of bimolecular structure of corn silk

2019 ◽  
Vol 9 (6) ◽  
pp. 4581-4585
Keyword(s):  
Biomedical Applications ◽  
Active Sites ◽  
Agricultural Waste ◽  
Quantitative Structure Activity Relationship ◽  
Biological Applications ◽  
Corn Silk ◽  
Promising Tool ◽  
Spectroscopic Analyses ◽  
Structure Activity ◽  
Modeling Data

Corn silk (CS) is a protein/ cellulosic agricultural waste. Due to its documented beneficial medical applications; corn silk aqueous extract was greenly prepared. FTIR spectroscopic analyses are conducted for three fractions of CS, then a model is prepared to simulate CS molecular structure. Based on FTIR analyses, a model is described as composite of dehydrated alanine unit lignin unit and two cellulose units with metal oxides namely MgO and CuO. Some important descriptors were calculated with Quantitative structure–activity relationship QSAR calculations. Then quantum mechanical calculations were conducted. Molecular modeling data indicated the CS applicability for several biomedical applications due to its active sites proved by electrostatic potential. The results confirmed the suitability of CS as promising tool for many biological applications.

scholarly journals Adsorption of Cu(II) from aqueous solution using raw peat: preliminary results

2019 ◽  
Vol 98 ◽  
pp. 06010 ◽  
Author(s):  
Olga Naymushina ◽  
Olga Gaskova
Keyword(s):  
Aqueous Solutions ◽  
Active Sites ◽  
West Siberia ◽  
Maximum Adsorption Capacity ◽  
Adsorption Data ◽  
Removal Of Heavy Metals ◽  
Freundlich Adsorption Isotherm ◽  
Time Variations ◽  
Highly Porous ◽  
Highly Porous Material

Peat is a polar, highly porous material that could have significant applications as an adsorbent for removal of heavy metals from aqueous solutions. Various functional groups in lignin allow such compounds to bind on active sites of peat. The adsorption of Cu (II) from aqueous solutions on peat from the West Siberia was studied in the concentration range of 10–150 mg/L and time variations of 0.25-12 hours. The pH of the solutions varied over a range of 3.2–4.3. The adsorption data could be fitted to a Freundlich adsorption isotherm and the maximum adsorption capacity of peat was determined to be 2.5⋅10-3 mmol/g when the initial concentration for Cu2+ was at its minimum (0.05 mmol/L), and the time of adsorption was 30 minutes.

A porous PdO microrod-based electrochemical sensor for nanomolar-level Cu2+ released from cells

2014 ◽  
Vol 2 (44) ◽  
pp. 7719-7724 ◽  
Author(s):  
Xia Cao ◽  
Yu Han ◽  
Caizhen Gao ◽  
Ying Xu ◽  
Xiaomin Huang ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Surface Area ◽  
Active Sites ◽  
Chemical Method ◽  
Large Surface Area ◽  
Wet Chemical Method ◽  
Wet Chemical ◽  
First Time ◽  
Highly Porous

Highly porous PdO microrods (PoPdOMRs) with a well-defined morphology, large surface area and active sites were synthesized via a facile wet chemical method for the first time.

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