#nanofiber

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CNF is that it’s 80% lighter than steel and 5 times stronger. It’s derived from wood pulp, a raw material produced using forestry and agricultural waste, essentially turning refuse into an incredibly capable material that can replace metal, plastic, and glass.

Scientists from Yokohama National University (YNU) have analyzed whether used coffee grounds can be used to make a form of bioplastic. The research was led by associate professor Izuru Kawamura from the Graduate School of Engineering Science, and recently published in the Cellulose journal on April 1st. Earth’s most abundant...

Application: air filtration, water filtration, battery diaphragm, electrode material, tissue engineering, drug sustained release, heavy metal ion adsorption, gas sensor, waterproof and moisture permeable clothing, catalyst etc. 

Feel free to ask me anything if you’ve got a question. I’m sorry if my description or tag offend you in any way. 

Nanofibers prepared by molecular self-assembly are in general not self-supporting and therefore require stabilizing scaffold structures. In fact, a lot of research in the past has been done with supramolecular self-assembly of molecules forming a network of nanofibers used as organo/hydrogelators. But efforts to use them as a self-standing membrane or as free fibers were not strong. Therefore, the self-assembly of trisamides was also tried on a substrate, i.e., other microfiber nonwovens, leading to microenanofiber composites (Fig. 4.4) used for filtration (Weiss et al., 2016).

TiO2, as a typical species of semiconductor oxide, has been widely applied in photocatalysis, mesoporous membranes, solar cells, etc. Considering their large specific surface area as well as surface/ interface effects, electrospun TiO2 nanofibers possess superior performance in various fields. In 2003, Li and Xia successfully prepared electrospun TiO2 nanofibers by employing PVP/ethanol/titanium tetraisopropoxide as a precursor solution system. The diameter and the porous structure of the obtained TiO2 nanofibers can be controlled by varying diverse parameters during the electrospinning process (Fig. 3.9). Since then, various solvent systems have been used to produce TiO2 nanofibers with different kinds of structure. Furthermore, numerous works have been reported with regard to the applications of electrospun TiO2 nanofibers. For instance, Chuangchote et al. synthesized diverse TiO2 nanofibers under different annealing temperature from 300C to 700C, and employed them as photocatalysts against hydrogen evolution. The results showed that the sample calcined at 450C exhibited the optimum catalytic activity.

Thermally induced phase separation is another bottom-up approach to making nanofibers and a well-interconnected network, which is based on the thermodynamic demixing of a homogeneous polymer solution due to exposure to another immiscible solvent or rapid cooling of the solution below a bimodal solubility curve. The demixing can be for solideliquid (binary polymeresolvent mixtures) or liquideliquid (usually for ternary polymer/solvent/nonsolvent mixtures). As a result, the polymer solution is separated into a polymer-rich phase and a polymer-poor phase. After removal of the solvent, the polymer-rich phase solidifies and forms a porous scaffold. In fact, in addition to nanofibers, a range of morphologies such as open- or closed-pore membranes are possible depending upon the separation conditions. The most important parameters affecting morphology are polymer type and concentration, polymer molecular weight, solvent/nonsolvent ratio, and cooling path. These parameters manipulate the phase-separation processes, such as the gelation and solvent-exchanging process. The process can be used for a large number of thermoplastics, such as polyurethane, polyvinylidene difluoride,