Use of Natural Biopolymers to Create Nanocomposite Materials

2020 ◽  
Vol 299 ◽  
pp. 299-304
Author(s):  
A.O. Makarova ◽  
L.R. Bogdanova ◽  
O.S. Zueva
Keyword(s):  
Carbon Nanotubes ◽  
Composite Materials ◽  
Sodium Alginate ◽  
Freeze Drying ◽  
Nanocomposite Materials ◽  
High Porosity ◽  
Composite Hydrogels ◽  
Xerogel Films

Method of carbon nanotubes disaggregation with the help of protein material, gelatin, has been proposed which facilitate to disperse evenly nanotubes in hydrogels based on gelatin and polysaccharides (sodium alginate or κ-carrageenan). In the obtained composite hydrogels carbon nanotubes are located in the biopolymer matrix, i.e. being in biocompatible form without losing their unique properties. The removal of water from the pores of the hydrogel by means of freeze drying allowed to obtain materials having high porosity and with included carbon nanotubes. The produced hydrogels can be used to create eco-friendly composite materials for biomedical and technical purposes. Depending on the tasks the developed systems can also be used in the forms of xerogel (films), cryogel, aerogel, and even in the form of powder, containing carbon nanotubes.

Hydroxyapatite-Poly(Vinyl Alcohol)-Sodium Alginate Porous Hydrogels with Poly(Vinyl Alcohol) Surface Layer Used for Articular Cartilage Repair

2016 ◽  
Vol 852 ◽  
pp. 1155-1161 ◽  
Author(s):  
Xiao Bing Luo ◽  
Ming Feng Ma ◽  
Xian Ju Zhou
Keyword(s):  
Articular Cartilage ◽  
Sodium Alginate ◽  
Vinyl Alcohol ◽  
Biological Properties ◽  
Poly Vinyl Alcohol ◽  
High Porosity ◽  
X Ray ◽  
Composite Hydrogels ◽  
Good Potential ◽  
Gas Foaming

The double-layered PVA/nanohydroxyapatite (nHA)-poly (vinyl alcohol)(PVA)-sodium alginate (SA) porous composite scaffolds used as synthetic articular cartilage were prepared by the freeze-thawing method, gas foaming method and crosslink method of Ca2+ ion, i.e., upper PVA layer for the cartilage substitute and underlying SA30 porous hydrogels for bone bonding. The microstructure and morphology of composite hydrogels were characterized using scanning electronic microscopy (SEM).It had high porosity and uniform pores. The content of HA in SA30 matrix were tested by Energy-dispersive X-ray spectroscopy (EDS). The biological properties of the composite hydrogels had been evaluated by co-culture and MTT. All results indicate that the PVA/SA30 hydrogels has good potential for repairing or replacing articular cartilage.

Controlling porosity and density of nanocellulose aerogels for superhydrophobic light materials

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 145-153 ◽  
Author(s):  
Chengua Yu ◽  
Feng Wang ◽  
Shiyu Fu ◽  
Lucian Lucia
Keyword(s):  
Contact Angle ◽  
Freeze Drying ◽  
Engine Oil ◽  
High Porosity ◽  
Water Mixture ◽  
Waste Engine Oil ◽  
Hydrophobically Modified ◽  
Static Contact ◽  
Oil Water ◽  
Hydrophobic Material

A very low-density oil-absorbing hydrophobic material was fabricated from cellulose nanofiber aerogels–coated silane substances. Nanocellulose aerogels (NCA) superabsorbents were prepared by freeze drying cellulose nanofibril dispersions at 0.2%, 0.5%, 0.8%, 1.0%, and 1.5% w/w. The NCA were hydrophobically modified with methyltrimethoxysilane. The surface morphology and wettability were characterized by scanning electron microscopy and static contact angle. The aerogels displayed an ultralow density (2.0–16.7 mg·cm-3), high porosity (99.9%–98.9%), and superhydrophobicity as evidenced by the contact angle of ~150° that enabled the aerogels to effectively absorb oil from an oil/water mixture. The absorption capacities of hydrophobic nanocellulose aerogels for waste engine oil and olive oil could be up to 140 g·g-1 and 179.1 g·g-1, respectively.

scholarly journals Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

Membranes ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 15 ◽  
Author(s):  
Mohamed R. Elmarghany ◽  
Ahmed H. El-Shazly ◽  
Saeid Rajabzadeh ◽  
Mohamed S. Salem ◽  
Mahmoud A. Shouman ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Vinylidene Fluoride ◽  
Bulk Material ◽  
Total Porosity ◽  
Surface Hydrophobicity ◽  
Membrane Distillation ◽  
Nanocomposite Membrane ◽  
High Porosity ◽  
Triple Layer ◽  
Layer Membrane

In this work, a novel triple-layer nanocomposite membrane prepared with polyethersulfone (PES)/carbon nanotubes (CNTs) as the primary bulk material and poly (vinylidene fluoride-co-hexafluoro propylene) (PcH)/CNTs as the outer and inner surfaces of the membrane by using electrospinning method is introduced. Modified PES with CNTs was chosen as the bulk material of the triple-layer membrane to obtain a high porosity membrane. Both the upper and lower surfaces of the triple-layer membrane were coated with PcH/CNTs using electrospinning to get a triple-layer membrane with high total porosity and noticeable surface hydrophobicity. Combining both characteristics, next to an acceptable bulk hydrophobicity, resulted in a compelling membrane for membrane distillation (MD) applications. The prepared membrane was utilized in a direct contact MD system, and its performance was evaluated in different salt solution concentrations, feed velocities and feed solution temperatures. The results of the prepared membrane in this study were compared to those reported in previously published papers. Based on the evaluated membrane performance, the triple-layer nanocomposite membrane can be considered as a potential alternative with reasonable cost, relative to other MD membranes.

The conductivity in Composite Materials Based on Oriented Carbon Nanotubes

2021 ◽  
Vol 76 (1) ◽  
pp. 29-35
Author(s):  
E. A. Vorobyeva ◽  
A. P. Evseev ◽  
V. L. Petrov ◽  
A. A. Shemukhin ◽  
N. G. Chechenin
Keyword(s):  
Carbon Nanotubes ◽  
Composite Materials
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