super water-repellent cellulose acetate mats - super water absorbent material
Step-by-step synthesis of super moleculeswater-
Cellulose acetate based (CA)
The mat is reported in this article.
The key elephant-like mechanisms involving roughness and chemical changes are used to describe changes in the water-repellent behavior of CA pads.
Subsequently, the contact angle calculation of Casey's model apparent contact angle prediction shows that it is impossible to produce super-
The Fourier transform infrared spectrum of the spin coating and the Electric spinning pad shows that there is a significant difference in the oh bond stretching of the two materials.
Because it is this oh-base that increases the overall polarity of the surface, thereby increasing the hydrophilic of the material, we propose that the electrostatic spinning process will not only produce a more rough surface, it will also change the chemical properties of the electrostatic spinning cellulose acetate pad, which eventually leads to the reported drainage.
Finally, due to their water-repellent properties and-
The textile mat was tested as a suction pad. The as-
Rotating pads are capable of absorbing oil 30 times its weight, which proves their application in oil
For materials considered to be super-hydrophobic, it must show the apparent water contact angle and the low contact angle lag of more than 150 °.
To find the material to show this, it doesn't need to look hard;
By simply studying nature, many excellent examples of super-hydrophobic surfaces can be found.
The leaves of many plants around the world have shown a hydrophobic effect, with tarsus of striped animals, Palm of gecko, and even the shell of some Desert beetles taking advantage of the hydrophobic effect.
Biomedical and other attempts
It has been concluded that surface roughness and surface energy are the key features that affect the hydrophobic properties of the material.
By manipulating these two properties, a lot of attempts have been made to develop super-drain materials.
Since the electrostatic spinning involves increasing the surface roughness, due to its simple setting and versatility in the production fiber, a processing technology that has attracted some attention is electrostatic spinning.
These studies have shown that the rough electro-spinning fibers are then coated and modified to reduce the surface energy and thus obtain the super-hydrophobic surface.
Examples of methods and materials used for surface coating of rough electro-spinning are through sol-'s TEOS: DTMS
Gel treated by plasma, CF4 coating, PPFEMA coating using chemical vapor deposition (iCVD)
Layer by layer (LBL)
Fluorine on the surface, etc.
Because it is clear that the formation of super-hydrophobic materials in the above-mentioned studies requires an obvious second step, the role of electrostatic spinning has always been considered as an air trap that only increases the surface roughness and provides the change of the material's hydrophobic properties.
Cellulose acetate (CA)
It is one of the polymers used to study the conversion of hydrophilic into hydrophobic by electrostatic spinning.
It is a modified natural polymer produced by cellulose hydrolysis, and it is one of the most abundant and cheap natural polymers.
Cost-renewable natural polymers for a wide range of applications such as textiles, membranes and filters.
With an oh base (
Depending on the degree of substitution)
In each glucose module of its structure, the drop coating surface of CA becomes polar and therefore naturally hydrophilic.
Using the two different routes mentioned earlier, the water-to-water transition in CA has previously been reported.
In this study, in the absence of further surface modification, a super water repellent CA fiber mat was developed using electrostatic spinning step by step. The as-
The spun CA fiber mat shows a 154 degree surface water shrinkage angle.
By studying the roughness and chemical changes of CA, the influence of electrostatic spinning on the water-repellent is studied uniquely.
Influence of electrostatic spinning on roughness (
And the subsequent contact angle)
The prediction of the surface has passed Casey in-
The spun fibers, which differ nearly 30 degrees from the results obtained in the laboratory, demonstrate previous assumptions about the need for further surface modification to explain the ultra-waterproof properties obtained after electrostatic spinning.
Infrared spectrum (FTIR)of the as-
The materials received by spinning and as showed a significant reduction in the tensile properties of oh bonds after electrostatic spinning.
We propose that in the case of CA, the electrostatic spinning at the same time makes the surface rough and modifies the surface energy in one step, resulting in a super-drain material.
Due to its super-hydrophobic and environmental compatibility,-
Spun CA matts has been tested as a potential replacement for traditional oil spill repair products.