PDF Publication Title:
Text from PDF Page: 237
Raman analysis. Moreover, the intrinsic nature of proteins to adsorb onto the surface of particles via their hydrophobic domains (‘pockets’) was explored in producing FLG, by directly exfoliating graphite in aqueous solutions of HSA, most abundant protein in human plasma. FLG dispersions with concentrations up to ~0.21 mg/ml in saline PBS buffer were obtained at the best exfoliation conditions of 24 hrs sonication and 2000 rpm centrifuge speed (starting HSA concentration of 5 mg/ml) and were found to be stable for up to 15 days. AFM analysis revealed strong adsorption of HSA onto graphene surfaces, where identified individual HSA molecules were visible. Raman analysis confirmed the pristine nature of the graphene. Strong fluorescence quenching of Tyr and Trp suggested that the hydrophobic domains of HSA were indeed interacting (𝜋 → 𝜋 and hydrophobic interactions) with graphene, possibly as a result of conformational changes due to its structural flexibility. Such HSA-coated graphene could act as ‘stealth’ nanomaterials in biological studies. o All the aqueous graphene dispersions produced in this thesis were examined for their cytotocity effects in cell-based biological systems (Red blood cells, breast cancer cells MCF-7, and macrophages murine J774A.1) by my collaborators. The results are presented in Appendix 9.6.1 and Figure 9.12. Cell culture experiments found that the solvent-exchanged and biocompatible surfactant-exfoliated pristine FLG displayed minimal cytotoxicity and albumin-exfoliated FLG hardly any cytotoxicity, whereas GO and phospholipid-exfoliated FLG were particularly cytotoxic. Finally, information on strain over a large structure (e.g. bridge) is crucial both during its design and in service. In addition to high accuracy, single-point, deformation measurements, there is a need to be able to measure local strain at multiple points over a structure. Whilst this can be achieved with electronically-based sensors (e.g. resistance strain gauges made from Cu-Ni alloy), every point of interest needs to be individually wired, leading to significant amount of infrastructure. Thus it is preferable to measure the strain using optical measurements, e.g. by using Raman spectroscopy, especially on carbon-based composites as their Raman bands are strain sensitive. Graphene is an ideal candidate for Raman active coatings because: 1) Its 2d nature suitable for coatings (each atom in graphene is sensible for change in its Chapter 8 – Conclusions and Future Works 237PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
PDF Search Title:
PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITESOriginal File Name Searched:
graphene-production-applications.PDFDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Power up your energy storage game with Salgenx Salt Water Battery. With its advanced technology, the flow battery provides reliable, scalable, and sustainable energy storage for utility-scale projects. Upgrade to a Salgenx flow battery today and take control of your energy future.
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |