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Publisher: Cambridge : Royal Society of Chemistry × Subject: Hydrogen bonds ×

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    Physical gels of poly(vinylamine) by thermal curing
    (Cambridge : Royal Society of Chemistry, 2020) Fischer, Thorsten; Köhler, Jens; Möller, Martin; Singh, Smriti
    Physical gels are a versatile class of materials which can find application in sensors, electrochemistry, biomedicine or rheological modifiers. Herein, we present a hydrogen-bonded physical gel which is based on the interaction between phenylcarbonate telechelic poly(ethylene glycol) (PEG-PC) and poly(vinyl amine-co-acetamide) (p(VAm-co-VAA)). The critical gelation concentration was found to be 10 wt% by rheology and NMR. UV-vis spectroscopy and dynamic light scattering reveal the formation of aggregates in the gel. Rheology and differential scanning calorimetry (DSC) was used to show the effect of thermal curing on the mechanical properties of the physical gel. © The Royal Society of Chemistry 2020.
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    Direct chemical vapor deposition synthesis of large area single-layer brominated graphene
    (Cambridge : Royal Society of Chemistry, 2019) Hasan, M.; Meiou, W.; Yulian, L.; Ullah, S.; Ta, H.Q.; Zhao, L.; Mendes, R.G.; Malik, Z.P.; Ahmad, N.M.; Liu, Z.; Rümmeli, M.H.
    Graphene and its derivatives such as functionalized graphene are considered to hold significant promise in numerous applications. Within that context, halogen functionalization is exciting for radical and nucleophilic substitution reactions as well as for the grafting of organic moieties. Historically, the successful covalent doping of sp2 carbon with halogens, such as bromine, was demonstrated with carbon nanotubes. However, the direct synthesis of brominated graphene has thus far remained elusive. In this study we show how large area brominated graphene with C-Br bonds can be achieved directly (i.e. a single step) using hydrogen rich low pressure chemical vapor deposition. The direct synthesis of brominated graphene could lead to practical developments. © The Royal Society of Chemistry.