This work reports a Raman study of graphene bilayer samples grown by chemical vapor deposition on copper foil, using laser lines in the UV range. The spectra show number extra peaks, classified different families, which appear nonuniformly across Cu surface, regions with sizes several $\ensuremath{\mu}$m. We interpret these new modes as due to Moir\'e patterns twisted layers graphene, each family peaks being associated twist rotational angles. theoretically analyze results, introducing...

Double-walled carbon nanotubes (DWNTs) prepared by catalytic chemical vapour deposition were functionalized in such a way that they optimally designed as nano-vector for the delivery of small interfering RNA (siRNA), which is great interest biomedical research and drug development. DWNTs initially oxidized coated with polypeptide (Poly(Lys:Phe)), was then conjugated to thiol-modified siRNA using heterobifunctional cross-linker. The obtained oxDWNT–siRNA characterized Raman spectroscopy...

Os métodos de articulação da estrutura histórico-geográfica das paisagens urbanas são fundamentais para a morfologia urbana e apresentam um potencial considerável, porém pouco reconhecidos no planejamento. M. R. G. Conzen proporcionou uma expressiva contribuição o seu desenvolvimento, principalmente entre final dos anos 1950 1980. Ele demonstrou que, em cidades britânicas tradicionais, forma delas historicamente estratificada reflete os resíduos distintivos períodos passados dá origem...

Este trabalho tem como fim expor os conceitos tradicionais de fringe belts, tanto definidos por Louis, em 1936, estudados M. R. G. Conzen na sua pesquisa 1960, quanto observados P. nas cidades norte-americanas. Pela identificação das características encontradas trabalhos elaborados pesquisadores brasileiros, pretende-se conceituar as principais abordagens e discutir a apropriada nomenclatura. Os procedimentos metodológicos incluem, inicialmente, consultas aos textos dos dois pesquisadores,...

Abstract Carbon nanotubes (CNT) provide a smart carrier system on the nanometer scale. The can be used as template for ferromagnetic fillers. Such molecular hybrid is promising potential candidate controlled heating of tumour tissue at cellular level. This key reason why it important to optimize synthesis route metal filled carbon with regards bulk scale and purity. In current study we present multiwalled α‐iron phase (Fe‐MWCNT). influence acid treatment stability filling sample purity also...

The effect of ${}^{13}$C isotope impurities on the phonon properties graphene is discussed theoretically. We calculated values lifetimes due to impurity scattering for all densities, isotopic masses, and wave vectors using second-order perturbation theory. found that natural concentrations ${}^{13}$C, contribution lifetime optical modes negligible when compared electron-phonon interaction. Nevertheless, atomic as high $\ensuremath{\rho}=0.5$ both contributions become comparable. Our results...

It is the temperature of annealing after transfer CVD graphene influencing doping and compression level, thus various Raman peak positions reported in literature.

In the present study we report resonance Raman on multiwalled carbon nanotubes treated with HCl, HNO 3 and H 2 SO 4 .Acids are commonly used in purification procedures order to remove catalyst particles from as-produced material.However, it is known that acid treatments can induce a surface functionalisation intercalation of walls, modifying their electronic properties.Here, comparative between samples modified most common acids materials, influence treatment time vibronic properties.The...

There is a degree of consensus about the theoretical foundations underpinning fringe-belt concept, but relevant empirical research carried out in different cultural contexts still raises important questions. In this paper methodology British urban morphology school applied planned new town Brazil order to draw comparisons. The identification fringe belts Maringá city confirms validity methodology. configuration may be compared formation ancient walled cities, attesting strength fixation...

In exploring the multidisciplinary development of urban morphology as a field knowledge in Brazil, this paper is an outgrowth from earlier contribution to journal. The main aspects considered are antecedents colonial era and early decades independence; pioneering work sociologists historians inter-war period; influence modernist thinking; design courses; significance ISUF Conference held Ouro Preto 2007. characteristics methodological foundations studies produced fields geography,...

Graphene reactivity can be modulated by creating intentional defects.

Viewpoints of [Brazilian urban morphology S. de A.P. Costa]

Purpose This article presents the current situation of Ouro Preto, first Brazilian city to be inscribed on World Heritage List UNESCO (United Nations Educational, Scientific and Cultural Organization) in 1980. It explores evolution urban form, especially concerning public policies development strategies as motors prompt city's expansion. Design/methodology/approach Landscape architecture concepts were employed understand impacts caused by settlement within its landscape. In addition,...

This article presents, interprets and applies the conceptual foundations established by English School of Urban Morphology. The has its origins in studies conducted MRG Conzen towns Alnwick New Castle upon Tyne, northern England, between 1950 1960. a German geographer who immigrated to England World War II, graduated from Geography Berlin, whose bases were structured on landscape visible results. In this approach, investigation changes continuities is used demonstrate fundamental emphasis...

The growth of iron filled multiwalled carbon nanotubes (Fe-MWCNT) using chemical vapour deposition (CVD) has been widely studied. Considering the remarkable magnetic and structural properties Fe-MWCNT, these materials have applied in numerous areas. In particular their biomedical application explored, where Fe-MWCNT can be used hyperthermia, acting as a local nano-heater at cellular level. Regarding this aim, reproducible highly purified ferromagnetically samples are still required. There...

AbstractLarge Brazilian cities present similar urban forms and development processes, despite the fact that some were implemented through different comprehensive plans, while still others founded to serve a wide range of purposes. Apart from these differences, have currently been experiencing considerable growth territorial expansion. Planning processes put forward but seldom effectively form legal cities. This paper presents characteristics one city, Belo Horizonte, which was designed 115...

Este artigo objetiva estudar o papel das florestas urbanas na provisão de serviços ecossistêmicos urbanos por meio da análise do sequestro carbono em áreas diferenciadas, no sistema espaços livres cidade Belo Horizonte, procurando ofertar indicadores qualidade ambientais e subsidiar a proposição diretrizes paisagísticas direcionadas à sua implantação ou melhoria. Pela interpretação aplicação princípios métodos relacionados ao estudo paisagem – especial aqueles escolas morfologia urbana...

Fringe belts, extensive areas of low density and wide open spaces designated for institutional use, are a morphological element in the urban landscape. Rabat, capital Morocco, conceived during French protectorate, received 2012, UNESCO World Heritage title representing modern planning model that integrates an space system with its historical nucleus. Nonetheless, criterion (v) – to be outstanding example traditional human settlement, which is representative culture (or cultures), or...