Thesis (MScFor (Forest and Wood Science))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: The purpose of the study was to investigate the potential tree taxa that could be grown as a source of biomass in the Cape Winelands region. The trials comprises of two different aspects. The first being the estimation of potential volume, density and biomass of a pair of six year-old stands of E. gomphocephala and E. cladocalyx families at two climatically different sites within the study region. The second part of the study was the early growth assessment of alternative taxa that could be planted in the region compared to the regional mainstay E. cladocalyx. The volume of families was estimated using appropriate volume equations and using the form height were none were available. The best volume yield varied from 4.6 to 11.2 m3 ha-1a-1, at the dry and sub-humid sites, respectively. Wood density, estimated from non-destructive samples at both sites, varied from 620 (sub-humid) to 588 kg m-3 (dry site). The estimated biomass production rate of the top producing families yielded 2.7 and 6.9 t ha -1a -1 at the dry and sub-humid sites, respectively. In terms of estimated biomass and survival, E. gomphocephala was more suited to the dry site, while E. cladocalyx displayed superior yield than E. gomphocephala on the sub-humid site, but not significantly so. Early growth assessment of the trial of alternative taxa found that the hybrid E. grandis × camldulensis and E. grandis × urophylla had superior biomass indices, but were more susceptible to infestation by Thaumastocoris peregrinus and Gonipterus scuttelatus. / AFRIKAANSE OPSOMMING: Die doel van hierdie studie was om potensiële boom taksa vir gebruik as ’n bron van biomassa in die Kaapse Wynlandstreek te ondersoek. Die proewe behels twee aspekte: eerstens die beraming van die potensiële volume, digtheid en biomassa van sesjaaroue opstande met families van E. gomphocephala en E. cladocalyx by twee klimatologies verskillende groeiplekke in die studiegebied; tweedens die beoordeling van die vroeë groei van alternatiewe taksa wat in die streek geplant kan word in vergelyking met die streek se historiese staatmaker-spesie E. cladocalyx. Die volume van die families is beraam deur gebruik te maak van toepaslike volumevergelykings, en met behulp van ’n vormfaktor waar vergelykings nie beskikbaar was nie. Die volume aanwas by die droë en sub-humiede groeiplekke was onderskeidelik 4.6 en 11.2 m3 ha-1j-1. Houtdigtheid is beraam deur nie-destruktiewe monsters uit die opstand te neem. Gemiddelde digthede het variëer van 588 (sub-humied) tot 620 kg m-3 (droë groeiplek). Die beraamde biomassaproduksie van die top-families beloop onderskeidelik 2.7 en 6.9 t ha -1j -1 vir die droë en sub-humiede groeiplekke. In terme van beraamde biomassa en oorlewing, is E. gomphocephala meer geskik vir droër groeiplekke , terwyl E. cladocalyx by die sub-humiede groeiplek ’n hoër opbrengs as E. gomphocephala getoon het, hoewel nie betekenisvol nie. Beramings van die vroeë groei by die proef met alternatiewe taksa het getoon dat die basters E. grandis × camldulensis en E. grandis × urophylla hoër biomassa-indekse het, maar meer vatbaar is vir besmetting deur Thaumastocoris peregrinus en Gonipterus scuttelatus. / Centre for Renewable and Sustainable Energy Studies

The reversible and topotactic insertion of guest species within layered host lattices, known as intercalation is a widely studied phenomena. The Layered Double Hydroxides (LDHs) or Anionic Alloys are important class of layered solids with its own distinct ion-exchange host-Guest Chemistry. The LDH structure may be derived from that of Brucite, Mg(OH)2, by random isomorphous substitution of Mg2+ ions by trivalent cations like Al3+, Ga3+ etc. This substitution leaves an excess positive charge on the layers, which is compensated by interlamellar anions. These ions are exchangeable and thus new functionalities can be introduced to ion exchange reactions. Insertion of neutral, non-polar or poorly water-soluble guest molecules remains a challenge. In the present study, two methodologies were adopted to extend the host-guest chemistry of LDHs to neutral and non-polar species, first by using Hydrophobic interaction and second, charge transfer (CT) interaction as driving force. Hlydrophobic interaction as driving force involves functionalization of the Mg-Al-LDH galleries as bilayers, thus covering the essentially hydrophilic interlamellar space of the LDH to one that is hydrophobic and able to solubilize neutral molecules like Anthracene. CT interaction as driving force, involves pre-functionalization of the galleries of the LDH with a donor species e.g. 4-aminobenzoic acid by conventional ion exchange methods to form a LDH-donor intercalated compound. This compound can selectively adsorb acceptor species like Chloranil, Tetracyanoquinodimethane etc. into the interlamellar space of the solid by forming donor-acceptor complexes. The confined donor-acceptor complexes have been characterized by X-Ray Diffraction, UV-Visible, Fourier Transformed Infra-Red and Raman Spectroscopy, Molecular Dynamics Simulations were able to reproduce the experimental results. One dimensional gold nanostructure like nanorods (AuNRs) have received great attention due to their size dependent optical properties, Extending these applications requires assembling the AuNRs into one-, two- and if possible three-dimensional architectures. Several approaches have been developed to assemble AuNRs in two-orientation modes namely end-to-end and side-to-side. The present study self-assembly of the AuNRs has been achieved by anchoring β-cyclodextrin (β-CD) cavities to the nanorods surface. The host-guest chemistry of β-CD has been exploited to assemble the AuNRs. Our strategy was to use a guest molecule that is capable to link β-CD into 1:2 host-guest fashions to link up two β-CD capped nanorods. The guest molecule chosen for the present study was 1,10-phenanthroline. Linkage between the ends of rods leading to V-shaped rods dimmer assembly and side-to-side assembly was achieved by varying the extent of cyclodextrin capping of the AuNRs followed by the addition of linker, 1,10-phenanthroline. The formation of the assembly was characterized using UV-Visible-Near-IR Spectoscopy and Transmission Electron Microscopy.

Submitted by ROBSON ROSA DA SILVA (robsilva31@gmail.com) on 2016-07-04T18:50:31Z No. of bitstreams: 1 Silva_2016_New photonic structures_Self assembly of 1D Te structures_Multifunctional biopolymers and reused plastics.pdf: 40718449 bytes, checksum: 9c299b328a4a54c169de6647b0225f34 (MD5) / Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-07-07T17:57:07Z (GMT) No. of bitstreams: 1 silva_rr_dr_araiq_par.pdf: 1063262 bytes, checksum: cc72dc79773da734cac767490756f56e (MD5) / Made available in DSpace on 2016-07-07T17:57:07Z (GMT). No. of bitstreams: 1 silva_rr_dr_araiq_par.pdf: 1063262 bytes, checksum: cc72dc79773da734cac767490756f56e (MD5) Previous issue date: 2016-05-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Nanoestruturas unidimensionais de telúrio (Te1D) na forma de whiskers, fios e hélices foram preparados com facilidade por uma síntese em etapa única na presença de solução aquosa de Pluronic® F68 à baixas temperaturas (< 100 °C) e pressão ambiente. A forma das nanoestruturas puderam ser controladas de acordo com a cinética da reação. Estruturas empacotadas de nanowhiskers e nanofios de Te foram obtidas via auto-organização em interface líquido-líquido e pela técnica de drop-cast em substrato de Si/SiO2. Estruturas híbridas 1D foram obtidas utilizando nanoestruturas Te1D como molde de sacrifício para anexar nanopartículas metálicas ou mesmo produzir nanoestruturas 1D metálicas. Por exemplo, nanoestruturas híbridas 1D foram preparadas decorando nanofios de Te com nanopartículas de Ag em solução aquosa de poli(vinilpirrolidona). Nanoestruturas 1D de Au com forma de nódulos foram preparados por deslocamento galvânico de íons Au3+ em uma mistura de nanohélices de Te, ácido ascórbico e solução aquosa de poli(vinilpirrolidona). Além disso, nanohélices de Te foram funcionalizadas com uma camada resina resorcinol-formaldeído em condições brandas de síntese. A resina de resorcinol-formaldeído é uma via intermédia para explorar a deposição de compostos opticamente ativos tais como nanopartículas de hidroxicarbonato de Tb3+ ou nanopartículas de Au. Para aplicações práticas é essencial que estas nanoestruturas possam ser suportadas em filmes rígidos ou flexíveis de alta qualidade óptica. Filmes de polímeros naturais puros e filmes híbridos de sol-gel epóxi foram avaliados como potenciais matrizes hospedeiras para luminóforos. A fabricação de híbridos é baseada na incorporação de 3-glicidoxipropiltrimetoxissilano na solução homogênea de polímero natural com posterior secagem sobre uma superfície plana. Particularmente, filmes flexíveis de fibroína da seda e acetato de celulose e os seus híbridos derivados exibiram excelentes propriedades ópticas para hospedar compostos opticamente ativos. Por exemplo, compostos de Eu3+ emissores na região do vermelho e corantes fluorescentes foram incorporados em matriz pura de polímero e híbridos epóxi e suas propriedades ópticas foram investigadas. Laser de corantes por feedback distribuído (DFB) foram fabricados dopando grades de difração de fibroína de seda com Rodamina 6G. Devido a sua capacidade de replicar superfícies padronizadas com resolução nanométrica, grades de fibroina da seda dopadas com corante foram depositadas contra a grade de difração de uma mídia de disco compacto comercial. Lasers modificados de DFB baseados em filmes de fibroina contendo nanopartículas espalhadoras de luz de SiO2 e Ag aleatoriamente distribuídas na grade de fibroina demonstraram aumento da intensidade do laser, além de estreitamento da largura do pico de emissão. Filmes híbridos flexíveis e transparentes (> 85%) de fibroina da seda e acetato de celulose modificados com função epóxi e contendo compostos fluorescentes na região do vermelho como complexos β-dicetonato de Eu3+ e nanopartículas de YVO4:Eu3+ em baixa proporção relativa mássica (<5%) foram preparados. De maneira geral, o resultado são filmes homogêneos com funções epoxi e/ou alcoxissilano não hidrolisados disponíveis para outras modificações químicas. Devido a matéria-prima limitada de polímeros naturais para uma alta demanda de fabricação de dispositivos ópticos, é igualmente importante desenvolver materiais com base na reutilização de polímeros sintéticos. Filmes finos de poliestireno foram concebidos por dissolução de poliestireno expandido (EPS) recuperado de resíduos em D-limoneno, um solvente verde proveniente de óleos cítricos. Filmes transparentes dopados com complexos β-dicetonato de Eu3+ demonstraram excelente transparência e aptos para uso em guias de luz. Estes resultados são motivadores para a) a engenharia de nanoestruturas 1D com propriedades ópticas sintonizáveis bem como, b) desenvolvimento de híbridos flexíveis e transparentes baseados em híbridos de polímeros naturais com alta funcionalidade química ou polímeros sintéticos reciclados como potenciais matrizes hospedeiras ópticas almejadas em aplicações fotônicas. / One-dimensional Te nanostructures (Te1D) in the shape of whiskers, wires and helices were prepared by a facile one-pot synthesis in the presence of aqueous Pluronic® F68 solution at low temperatures (< 100 ºC) and ambient pressure. The shape of Te1D nanostructures could be manuvered according with the reaction kinectics. We evaluate some techniques to assemble Te1D nanostructures on the pursuit for complex nanoarchitectures. Bundles of Te nanowhiskers and nanowires were achieved by self-assembly in liquid-liquid interface or by drop-cast technique in Si/SiO2 substrates. 1D hybrid structures have been conceived by using Te1D nanostructures as sacrificial template to attach metallic nanoparticles or even produce metallic 1D nanostructures. For example, 1D hybrid nanostructures were easily prepared by decorating Te nanowires with Ag nanoparticles in aqueous solution of poly(vinylpyrrolidone). Au 1D nanostructures with nodular-like shape were prepared by galvanic displacement of Au3+ ions in a mixture of Te nanohelices, ascorbic acid and an aqueous solution of poly(vinylpyrrolidone). Furthermore, Te1D nanohelices were functionalized with a layer of resorcinol-formaldehyde resin at mild synthesis conditions. The RF resin allowed us to fashion an intermediate pathway to explore the deposition of optically active compounds like Tb3+ hydroxylcarbonate or Au nanoparticles. Seeking practical applications, these nanostructures should be hosted over rigid or flexible films possessing excellent optical properties. Pure natural polymers and epoxy sol-gel hybrids films were evaluated as potential host for luminophors. The fabrication of epoxy hybrids is based on the incorporation of 3-glycidoxypropyltrimethoxysiloxane on the homogenous solution of natural polymer with subsequent casting over flat surface. Particularly, flexible silk fibroin and cellulose acetate films and their derivative hybrids displayed excellent optical properties to host optically active compounds. For instance, red emitting Eu3+ compounds and fluorescent dyes were hosted on pure natural polymer and hybrid films and the optical features of the luminescent films were investigated thoroughly. Distributed feedback dye-lasers were fabricated by doping silk fibroin diffraction gratings with Rhodamine 6G. Owing its ability to mimic patterned surfaces at nanoscale resolution, dye-doped SF gratings were fabricated using replica-casting patterning against a commercial blank digital versatile disc as template. A modified DFB Laser based on SF films with Ag or SiO2 light scattering particles randomly distributed on the grating unveiled an enhancement of laser intensity withal narrowing of emission peak linewidth. Flexible and highly transparent SF- and CA-epoxy hybrids (> 85%) containing red fluorescent Eu3+ b-diketonate complex and YVO4:Eu3+ nanoparticles at low relative content (< 5 wt%) were tailored. In general, the outcome is homogeneous films with epoxy and/or unhydrolized alkoxysilane functions available for further chemical modification. Owing the limited feedstock of natural polymers for high demanding production of optical devices, it is equally important develop materials based on the reuse of synthetic polymers. Thin films of polystyrene were conceived by dissolving waste-recovered expanded-polystyrene (EPS) in D-limonene, a green solvent from citrus oil. Transparent EPS films doped with Eu3+ b-diketonate complex displayed excellent transparency and light waveguiding, These assertions provide a framework that motivates the research on a) engineering of 1D hybrids nanostructures with tunable optical properties and b) flexible natural polymer/epoxy hybrid with enhanced functionality or plastic recycled as potential optical hosts sought in photonic applications. / FAPESP: 2013/12367-6

Made available in DSpace on 2015-03-26T14:01:01Z (GMT). No. of bitstreams: 1 texto completo.pdf: 897624 bytes, checksum: d480d10072d149a1cc7bfa53c79a065b (MD5) Previous issue date: 2010-04-26 / The objective of this study was to analyze the effect of fifteen eucalypt clones forest productivity on wood basic density and kraft pulping yield. Four regions with different raining intensities were used for this study. The base was a trial of genetic and environmental interaction, testing 48 hybrids eucalipt clones, of with 15 with bether silvicultural performance were selected for basic density and kraft pulping yeld analysis. Results obtained demonstrated significant differences in forest annual growth increments and the correlation between forest productivity and wood basic density, showed itself low, concerning genetic aspect and negatively high, considering environmental aspect. It was also detected lower pulping yields for eucalypts clones planted in lower productivity regions and having higher wood density. Differently from other studies published by technical literatures, the alkali charge for pulping did not show significant correlation with pulping yield. / Este estudo teve como objetivo avaliar a influência da produtividade de 15 clones híbridos de eucalipto, plantados em quatro regiões de precipitações pluviométricas distintas, na densidade básica da madeira e na polpação kraft. A base do estudo foi um experimento de interação genótipo x ambiente, em que 48 clones híbridos de eucalipto foram plantados em quatro regiões distintas em termos de precipitação, na região extremo sul da Bahia. Os melhores 15 clones em termos de desempenho silvicultural foram selecionados para análise de densidade básica e polpação Kraft. O delineamento experimental utilizado foi o de blocos ao acaso, com três repetições por local e seis plantas por parcela. Aos 7 anos de idade, os clones foram mensurados e avaliados do ponto de vista silvicultural, ou seja, forma do tronco e da copa, além da incidência de doenças. Os 15 melhores clones tiveram suas madeiras amostradas e transformadas em cavacos, para posterior determinação de suas densidades básicas, também foram submetidos a cozimentos Kraft em digestor Batch, contendo células para 250 gramas de cavacos. Os resultados indicaram diferença significativa de incremento médioanual entre as quatro regiões estudadas, mostrando efeito positivo da precipitação sobre a produtividade e a correlação entre o IMA e a densidade básica da madeira, baixa no aspecto genético e negativamente alta, no aspecto ambiental. Também foi observado menor rendimento de celulose dos clones na região onde ocorreu a menor produtividade e maior densidade da madeira, provavelmente pela maior dificuldade de impregnação dos cavacos pelo álcali. Contrariando outros estudos descritos em literatura, a demanda de álcali para polpação não apresentou correlação com o rendimento decelulose.

Made available in DSpace on 2016-12-08T17:19:34Z (GMT). No. of bitstreams: 1 01_Capa_Sumario.pdf: 97224 bytes, checksum: 84cdd855f48b9820d3374a610091b98c (MD5) Previous issue date: 2010-02-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The main goal of this work was the synthesis of silsesquioxane oligomers containing amine and phenyl groups, and the subsequent formation of an organic-inorganic hybrid by reaction of amine groups of the silsesquioxane precursor with the epoxy rings of bisphenol A diglycidyl ether (BADGE). The sol-gel process adopted in the oligomers syntheses proved to be efficient for the condensation reaction between 3-aminopropyltriethoxysilane and phenyltriethoxysilane. Epoxy-silsesquioxane hybrids prepared from oligomers with different condensation degrees were studied. These matrices were further reinforced with 0.25 % (w/w) of multi-walled carbon nanotube (MWCNT). Resin transfer molding (RTM) was also used to produce reinforced nanocomposites with carbon fiber (CF) and MWCNT (0.25 and 0,50 % (w/w)). Liquid state 29Si nuclear magnetic resonance analysis indicated that T3 structure is the major phase forming the synthesized oligomer. Infrared spectroscopy analyses confirmed the formation of epoxy-copolysilsesquioxane hybrid and showed that a high degree of cure was achieved after the addition of an aliphatic polyamine, however, an increase in thermal stability of produced hybrids was not observed. Glass transition temperatures (Tg) obtained by dilatometry and DMA did not show a trend of increase or decrease in this property for the produced hybrids by casting. The cured hybrids presented a brittle type fracture, similar to epoxy resin. The addition of MWCNT to the hybrid matrix did not influence the tensile mechanical properties (Young modulus and tensile strength) and caused a reduction in the Tg of the nanocomposites. Good wettability of CF by resin was observed in the nanocomposites obtained by RTM, providing significant increases in mechanical properties under tensile and impact, however, the Tg s decreased by 30 % in relation to epoxy. Unlike casting molding, the addition of MWCNT in the RTM process provided a significant increase in the mechanical properties analyzed. / Este trabalho teve por objetivo a síntese de oligômeros de silsesquioxanos contendo grupos amino e fenil, e a posterior formação de um híbrido orgânico-inorgânico pela reação dos grupos amino do precursor silsesquioxano com o anel epoxídico da resina diglicidil éter de bisfenol A (DGEBA). O processo sol-gel adotado na síntese dos oligômeros demonstrou ser eficiente na reação de condensação entre o 3-aminopropiltrietoxissilano e feniltrietoxissilano. Matrizes híbridas com silsesquioxanos de diferentes graus de condensação foram estudadas. A estas matrizes foram adicionados 0,25 % (m/m) de nanotubos de carbono de paredes múltiplas (MWCNT). A moldagem por transferência de resina (RTM) foi utilizada na produção de nanocompósitos reforçados com fibra de carbono (CF) e MWCNT (0,25 e 0,50 % (m/m)). Análise de ressonância magnética nuclear 29Si em solução revelou que o sítio T3 é a maior fase constituinte do oligômero sintetizado. Espectroscopia de infravermelho confirmou a formação do híbrido epóxidocopolissilsesquioxano e mostrou que um alto grau de cura foi atingido após a adição de uma poliamina alifática, contudo, não se observou aumento na estabilidade térmica dos híbridos produzidos. As temperaturas de transição vítrea (Tg) obtidas por dilatometria e DMA não apresentaram uma tendência de aumento ou decréscimo nesta propriedade dos híbridos produzidos por casting. Os híbridos curados apresentaram caráter de fratura do tipo frágil, semelhante à resina epoxídica. A adição de MWCNT às matrizes híbridas não influenciou as propriedades mecânicas sob tração (módulo de elasticidade e tensão máxima) e provocou uma diminuição da Tg nos respectivos nanocompósitos. Uma boa molhabilidade das CF pela resina foi observada nos nanocompósitos obtidos por RTM proporcionando aumentos expressivos nas propriedades mecânicas sob tração e impacto, contudo, as Tg s apresentaram uma queda de 30 % em relação ao epóxido. Ao contrário da moldagem por casting, no RTM a adição de MWCNT proporcionou aumentos significativos nas propriedades mecânicas analisadas.

Orientador: Sidney José Lima Ribeiro / Resumo: Este trabalho descreve o desenvolvimento de membranas de cellulose bacterianas (BCM), econômicas e ecologicamente amigáveis com propriedades funcionais. Nanopartículas de sílica esféricas com tamanho de partícula de cerca de 51 ± 4 nm, obtidas pelo método sol-gel e nanopartículas de sílica com tamanho de partículas heterogêneo, extraídas da casca de arroz, foram preparadas e funcionalizadas pelas metodologias in situ e post-grafting, respectivamente, com alcoxisilanos com propriedades easy-cleaning e curcuma. Nanocompósito de anatase SiO2@TiO2 preparado pelo método sol-gel, também foi desenvolvido. Posteriormente, estes nanomateriais funcionais e os organosilanos 1,4 – bis(trietoxissilil)benzeno (BTEB), Bis(trietoxisililpropil)disulfeto (BTPD) and 1,2-Bis(trietoxissilil)etano (BTSE), foram imobilizados com sucesso na BCM, segundo as metodologias in situ e post-grafting. Na BCM funcionalizada com os organosilanos BTEB, BTPD e BTSE, nanopartículas de sílica esféricas com estrutura porosa e distribuição de tamanho de partícula heterogêneo, foram formados nas fibras de celulose. A repelência da BCM funcionalizado com nanopartículas de sílica contendo propriedades de limpeza facilmente melhorada notavelmente. BCM apresenta fobicidade à água, tolueno, cicloexano e solução de suor artificial. Especificamente, a BCM funcionalizada com a amostra SiO2@F13TES segundo as metodologias in situ e post-grafting, apresentam uma superfície quase superhidrofóbica (> 150°). As medições de decomp... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This work reports the development of economic and environmentally friendly Bacterial Cellulose Membrane (BCM) with functional properties. The spherical mesoporous silica nanoparticles with average particle size around 51 ± 4 nm, obtained by sol-gel method and spherical silica nanoparticles with heterogeneous particles size distribution (20-40 nm) obtained through agro-industrial waste were prepared and functionalized by in situ and post-grafting methodology, respectively, with alkoxysilanes with easy-cleaning properties and natural dye obtained through natural extracts, namely curcuma. Anatase TiO2@SiO2 spherical nanocomposites prepared by the sol-gel method, have also been developed. Subsequently, these functional nanomaterials and the organosilanes 1,4 – bis(triethoxysilyl)benzene (BTEB), Bis(triethoxysilylpropyl)disulfide (BTPD) and 1,2-Bis(triethoxysilyl)ethane (BTSE), were successfully incorporated into BCM, by in situ and post-grafting methodologies. In the BCM functionalized with BTEB, BTPD and BTSE, spherical silica nanoparticles with porous structure and heterogeneous particle size, were formed on the cellulose fibers. The surface repellency of the functionalized BCM with silica nanoparticles containing easy-cleaning properties was remarkably enhanced. This BCM displaying phobicity to water, toluene, cyclohexane and artificial sweat. Specifically, the BCM functionalized by in situ and post-grafting with SiO2@F13TES, displayed a surface almost superhydrophobic (> 150°... (Complete abstract click electronic access below) / Doutor

Philosophiae Doctor - PhD / Energy storage technologies are rapidly being developed due to the increased awareness of global warming and growing reliance of society on renewable energy sources. Among various electrochemical energy storage technologies, high power supercapacitors and lithium ion batteries with excellent energy density stand out in terms of their flexibility and scalability. However, supercapacitors are handicapped by low energy density and batteries lag behind in power. Supercapatteries have emerged as hybrid devices which synergize the merits of supercapacitors and batteries with the likelihood of becoming the ultimate power sources for multi-function electronic equipment and electric/hybrid vehicles in the future. But the need for new and advanced electrodes is key to enhancing the performance of supercapatteries. Leading-edge technologies in material design such as nanoarchitectonics become very relevant in this regard. This work involves the preparation of vanadium pentoxide (V2O5), pristine and zinc doped lithium manganese silicate (Li2MnSiO4) nanoarchitectures as well as their composites with hydroxylated graphene (G-ol) and carbon nanotubes (CNT). / 2023-12-01

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