Academic Journal
Micropatterning of Biologically Derived Surfaces with Functional Clay Nanotubes
| العنوان: | Micropatterning of Biologically Derived Surfaces with Functional Clay Nanotubes |
|---|---|
| المؤلفون: | Lama, Nisha |
| المصدر: | Doctoral Dissertations |
| بيانات النشر: | Louisiana Tech Digital Commons |
| سنة النشر: | 2024 |
| المجموعة: | Louisiana Tech Digital Commons |
| مصطلحات موضوعية: | Halloysite, Clay nanotubes, Functional biomaterials, Nanocomposites, Nanoarchitectonics, Biosurfaces, Biomedical Engineering and Bioengineering, Nanoscience and Nanotechnology |
| الوصف: | In this study, we have generalized an assembly of 50 nm diameter clay nanotubes on larger 20-50 μm diameter biological microfibers such as human hair (protein), cotton (cellulose) and synthetic polyethylene terephthalate- PET. We developed a common set of parameters and nanoclay coating techniques on these naturally different microfibers. We exploited and optimized the electrostatic interaction of the components through strategic adjustments in the solvent pH, employing polycation treatment, as well as selectively modifying the halloysite nanotubes with silanes. For 5 mins, a 5 wt% aqueous dispersion of halloysite nanotubes were applied to get approximately 1-2 μm thick fiber coating after a pretreatment with 0.1 wt % of cationic polyethyleneimine – PEI to allow for a more stable coating. In our first study, we reported the optimized properties of a polycation treatment PEI for hair surface nanoclay coating, where the ideal molecular weight to use for PEI was found to be at 1300 at pH 11. At the optimized conditions, halloysite coverage was over 70 % and the color retention lasted for up to 6 shampoo washes. As an extension of this project, we also further investigated magnetite nanoparticles coating on human hair by stabilizing them with polyelectrolytes such as polystyrene sulfonate - PSS. The findings from this study showed that magnetite nanoparticles of 200 nm diameter could be deposited on human hair in dense arrays and may be used as effective carriers for drug loading and delivery. Similarly, we also investigated enhanced flame retardancy and antibacterial protection on cotton through the application of a halloysite nanoclay coating. Unbleached, unprocessed cotton was treated with multiple PEI/HNT bilayers and was burned to determine the extent of fire protection. Through our experiments we found out that simply adding two bilayers of PEI/HNT coating reduced cotton flammability. The two bilayers accounted for a total of 7 wt% of the tissue. Surprisingly, we also found out that adding increased nanoclay ... |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| Relation: | https://digitalcommons.latech.edu/dissertations/1025; https://digitalcommons.latech.edu/context/dissertations/article/2036/viewcontent/Dissertation___Nisha_Lama.pdf |
| الاتاحة: | https://digitalcommons.latech.edu/dissertations/1025 https://digitalcommons.latech.edu/context/dissertations/article/2036/viewcontent/Dissertation___Nisha_Lama.pdf |
| رقم الانضمام: | edsbas.6CF40419 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |