LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Back to previous search Search history
Advanced search

Your last searches

  1. AU="Maria-Magdalena Titirici"
  2. AU="Papapoulos, Socrates"
  3. AU="Valdivia, Anddre Osmar"
  4. AU="Graham, Miranda"
  5. AU="Lisitsyn, Nikolai A"

Search results

Result 1 - 10 of total 26

Search options

  1. Article ; Online: Investigating the Effect of Reaction Time on Carbon Dot Formation, Structure, and Optical Properties

    Nikolaos Papaioannou / Maria-Magdalena Titirici / Andrei Sapelkin

    ACS Omega, Vol 4, Iss 26, Pp 21658-

    2019  Volume 21665

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2019-12-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Article ; Online: Large electronegativity differences between adjacent atomic sites activate and stabilize ZnIn2S4 for efficient photocatalytic overall water splitting

    Xu Xin / Yuke Li / Youzi Zhang / Yijin Wang / Xiao Chi / Yanping Wei / Caozheng Diao / Jie Su / Ruiling Wang / Peng Guo / Jiakang Yu / Jia Zhang / Ana Jorge Sobrido / Maria-Magdalena Titirici / Xuanhua Li

    Nature Communications, Vol 15, Iss 1, Pp 1-

    2024  Volume 12

    Abstract: Abstract Photocatalytic overall water splitting into hydrogen and oxygen is desirable for long-term renewable, sustainable and clean fuel production on earth. Metal sulfides are considered as ideal hydrogen-evolved photocatalysts, but their component ... ...

    Abstract Abstract Photocatalytic overall water splitting into hydrogen and oxygen is desirable for long-term renewable, sustainable and clean fuel production on earth. Metal sulfides are considered as ideal hydrogen-evolved photocatalysts, but their component homogeneity and typical sulfur instability cause an inert oxygen production, which remains a huge obstacle to overall water-splitting. Here, a distortion-evoked cation-site oxygen doping of ZnIn2S4 (D-O-ZIS) creates significant electronegativity differences between adjacent atomic sites, with S1 sites being electron-rich and S2 sites being electron-deficient in the local structure of S1–S2–O sites. The strong charge redistribution character activates stable oxygen reactions at S2 sites and avoids the common issue of sulfur instability in metal sulfide photocatalysis, while S1 sites favor the adsorption/desorption of hydrogen. Consequently, an overall water-splitting reaction has been realized in D-O-ZIS with a remarkable solar-to-hydrogen conversion efficiency of 0.57%, accompanying a ~ 91% retention rate after 120 h photocatalytic test. In this work, we inspire an universal design from electronegativity differences perspective to activate and stabilize metal sulfide photocatalysts for efficient overall water-splitting.
    Keywords Science ; Q
    Subject code 500
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Surface Interactions during the Removal of Emerging Contaminants by Hydrochar-Based Adsorbents

    Silvia Román / Joâo Manuel Valente Nabais / Beatriz Ledesma / Carlos Laginhas / Maria-Magdalena Titirici

    Molecules, Vol 25, Iss 2264, p

    2020  Volume 2264

    Abstract: The aim of this work was to test activated carbons derived from hydrochars produced from sunflower stem, olive stone and walnut shells, as adsorbents for emerging contaminants in aqueous solution, namely fluoxetine and nicotinic acid. The adsorption ... ...

    Abstract The aim of this work was to test activated carbons derived from hydrochars produced from sunflower stem, olive stone and walnut shells, as adsorbents for emerging contaminants in aqueous solution, namely fluoxetine and nicotinic acid. The adsorption capacity was determined by the chemical nature of the adsorbents, namely the presence of specific functional groups and their positive or negative ionization in aqueous solutions and also by steric factors. The activated carbons produced by air showed a higher adsorption capacity of fluoxetine, whilst the samples produced by carbon dioxide activation were more useful to remove nicotinic acid. In general, surface acidity was advantageous for fluoxetine adsorption and detrimental for nicotinic acid removal. The adsorption mechanisms involved in each case were discussed and related to the adsorbents characteristics. The maximum adsorption capacity, Q 0 , given by the Langmuir model was 44.1 and 91.9 mg g −1 for fluoxetine and nicotinic acid adsorption, respectively.
    Keywords activated carbons ; adsorption ; hydrocarbonization ; pharmaceutical effluents ; water ; Organic chemistry ; QD241-441
    Subject code 660
    Language English
    Publishing date 2020-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  4. Article ; Online: Characterization of carbon products from microwave-driven methane pyrolysis

    Mehran Dadsetan / Kenneth G. Latham / Mohammad Fawaz Khan / Mohammed H. Zaher / Sama Manzoor / Erin R. Bobicki / Maria‐Magdalena Titirici / Murray J. Thomson

    Carbon Trends, Vol 12, Iss , Pp 100277- (2023)

    2023  

    Abstract: Hydrogen production via methane pyrolysis is projected to have a key role in achieving net zero GHG emission by 2050. Carbon makes up to 75% by mass of the products of methane pyrolysis, indicating the importance of a thorough characterization to find ... ...

    Abstract Hydrogen production via methane pyrolysis is projected to have a key role in achieving net zero GHG emission by 2050. Carbon makes up to 75% by mass of the products of methane pyrolysis, indicating the importance of a thorough characterization to find its potential applications. A new approach is methane pyrolysis utilizing microwaves, where the carbon product serves as receptors for the microwave energy. In this method, methane decomposes and forms solid carbon. In this study, we evaluated the morphological and structural features of the produced carbon using SEM, XRD, XPS, Raman spectroscopy, and thermogravimetric analysis. The analysis indicates that the pyrolytic carbon produced through this process is highly pure and exhibits a semi-graphitic structure with localized defects. Additionally, the surface morphology of the carbon material was observed to possess a rough cauliflower-like texture. A thorough characterization of carbon revealed several potential applications, including the utilization of granular carbon in electric arc furnace for steelmaking, the feedstock for graphene production, and serving as an anode material in Na-ion batteries with further optimization of the production process. Safe sequestration of the carbon due to limited demand is feasible as the carbon is pure and oxygen-free, indicating its potential to remain unreacted over a long period after sequestration.
    Keywords Pyrolytic carbon ; Carbon utilization ; Structural characterization ; Semi-graphitic carbon ; Chemistry ; QD1-999
    Subject code 660
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article ; Online: Carbon film produced from microwave-driven methane pyrolysis

    Mehran Dadsetan / Kenneth G. Latham / Boran Kumral / Mohammad Fawaz Khan / Mia Scott / Tirthankar Mitra / Ali Naseri / Sama Manzoor / Erin R. Bobicki / Tobin Filleter / Maria‐Magdalena Titirici / Murray J. Thomson

    Carbon Trends, Vol 12, Iss , Pp 100283- (2023)

    2023  

    Abstract: Methane pyrolysis is a widely used technique for producing hydrogen and valuable carbon materials. Among these materials are carbon films, which have a diverse range of properties that make them useful for various applications. This study focuses on ... ...

    Abstract Methane pyrolysis is a widely used technique for producing hydrogen and valuable carbon materials. Among these materials are carbon films, which have a diverse range of properties that make them useful for various applications. This study focuses on synthesizing a new type of carbon film through a microwave-driven methane pyrolysis process. The resulting metallic-like carbon film deposits on a polished quartz substrate and detaches as it thickens. We conducted a thorough characterization of the film's properties, using different techniques to study its surface morphology and structural features. Our findings show that the carbon film has a smooth surface texture and a semi-graphitic internal structure, with 78% of the carbon atoms exhibiting sp2 bonding as revealed by X-ray photoelectron spectroscopy. X-ray diffraction analysis further confirms the presence of microcrystalline carbon fragments within the film. Additionally, conductivity measurements using a conductive-atomic force microscope demonstrate the carbon film's remarkable electrical conductivity, comparable to that of gold and silver metals. The electrochemical measurements indicate that the carbon film's high conductivity and free-standing nature make it a promising candidate for use as a direct active material in sodium-ion batteries. This is because the film does not require binders or conductive agents, which can improve battery performance.
    Keywords Conductive carbon film ; Thin film carbon ; Methane pyrolysis ; Microwave-driven pyrolysis ; Chemistry ; QD1-999
    Subject code 660
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  6. Article ; Online: Hydrothermal Conversion of Spent Sugar Beets into High-Value Platform Molecules

    Jens Pfersich / Pablo J. Arauzo / Michela Lucian / Pierpaolo Modugno / Maria-Magdalena Titirici / Luca Fiori / Andrea Kruse

    Molecules, Vol 25, Iss 3914, p

    2020  Volume 3914

    Abstract: The growing importance of bio-based products, combined with the desire to decrease the production of wastes, boosts the necessity to use wastes as raw materials for bio-based products. A waste material with a large potential is spent sugar beets, which ... ...

    Abstract The growing importance of bio-based products, combined with the desire to decrease the production of wastes, boosts the necessity to use wastes as raw materials for bio-based products. A waste material with a large potential is spent sugar beets, which are mainly used as animal feeds or fertilizers. After hydrothermal treatment, the produced chars exhibited an H/C ratio of 1.2 and a higher heating value of 22.7 MJ/kg, which were similar to that of subbituminous coal and higher than that of lignite. Moreover, the treatment of 25 g/L of glucose and 22 g/L of fructose by heating up to 160 °C led to a possible application of spent sugar beets for the production of 5-hydroxymethylfurfural. In the present study, the maximum concentration of 5-hydroxymethylfurfural was 3.4 g/L after heating up to 200 °C.
    Keywords agro-residues ; sugar beets ; biomass ; hydrothermal carbonization ; hydrolysis ; sugars ; Organic chemistry ; QD241-441
    Language English
    Publishing date 2020-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Article ; Online: Characterization of biomass and its derived char using 13C-solid state nuclear magnetic resonance

    Niki Baccile / Camillo Falco / Maria-Magdalena Titirici

    Green Chemistry

    2014  

    Publishing country de
    Document type Article ; Online
    DOI 10.1039/C3GC42570C
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Article ; Online: Towards a mechanistic understanding of particle shrinkage during biomass pyrolysis via synchrotron X-ray microtomography and in-situ radiography

    Meredith Rose Barr / Rhodri Jervis / Yeshui Zhang / Andrew J. Bodey / Christoph Rau / Paul R. Shearing / Dan J. L. Brett / Maria‐Magdalena Titirici / Roberto Volpe

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 13

    Abstract: Abstract Accurate modelling of particle shrinkage during biomass pyrolysis is key to the production of biochars with specific morphologies. Such biochars represent sustainable solutions to a variety of adsorption-dependent environmental remediation ... ...

    Abstract Abstract Accurate modelling of particle shrinkage during biomass pyrolysis is key to the production of biochars with specific morphologies. Such biochars represent sustainable solutions to a variety of adsorption-dependent environmental remediation challenges. Modelling of particle shrinkage during biomass pyrolysis has heretofore been based solely on theory and ex-situ experimental data. Here we present the first in-situ phase-contrast X-ray imaging study of biomass pyrolysis. A novel reactor was developed to enable operando synchrotron radiography of fixed beds of pyrolysing biomass. Almond shell particles experienced more bulk shrinkage and less change in porosity than did walnut shell particles during pyrolysis, despite their similar composition. Alkaline pretreatment was found to reduce this difference in feedstock behaviour. Ex-situ synchrotron X-ray microtomography was performed to study the effects of pyrolysis on pore morphology. Pyrolysis led to a redistribution of pores away from particle surfaces, meaning newly formed surface area may be less accessible to adsorbates.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  9. Article: High density graphene–carbon nanosphere films for capacitive energy storage

    Díez, Noel / Mo Qiao / Juan Luis Gómez-Urbano / Cristina Botas / Daniel Carriazo / Maria Magdalena Titirici

    Journal of materials chemistry A. 2019 Mar. 12, v. 7, no. 11

    2019  

    Abstract: Highly packed films of reduced graphene oxide and sugar-based carbon nanospheres (CNSs) were prepared by a simple hydrothermal treatment. Under hydrothermal conditions, graphene oxide was partially reduced and self-assembled forming a monolith that ... ...

    Abstract Highly packed films of reduced graphene oxide and sugar-based carbon nanospheres (CNSs) were prepared by a simple hydrothermal treatment. Under hydrothermal conditions, graphene oxide was partially reduced and self-assembled forming a monolith that effectively embedded the CNSs. The spheres were homogeneously distributed within the films, that had an apparent density of up to 1.40 g cm⁻³. The films thus synthesized were directly assembled into a cell and tested as free-standing electrodes for supercapacitors without using any binder or conductive additive. Electrodes with a mass loading similar to that of commercial devices showed very high values of volumetric capacitance (252 F cm⁻³) and also an excellent rate capability (64% at 10 A g⁻¹) despite their highly packed microstructure. The homogeneous dispersion of the nanospheres was responsible for the improved ion diffusion when compared to the CNS-free counterpart. The use of a small CNS/graphene wt ratio is essential for achieving such good rate capability without compromising its performance in volumetric terms.
    Keywords capacitance ; electrodes ; energy ; graphene ; graphene oxide ; hot water treatment ; microstructure ; nanospheres
    Language English
    Dates of publication 2019-0312
    Size p. 6126-6133.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c8ta12050a
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  10. Article ; Online: Structure and solvents effects on the optical properties of sugar-derived carbon nanodots

    Nikolaos Papaioannou / Adam Marinovic / Noriko Yoshizawa / Angela E. Goode / Michael Fay / Andrei Khlobystov / Maria-Magdalena Titirici / Andrei Sapelkin

    Scientific Reports, Vol 8, Iss 1, Pp 1-

    2018  Volume 10

    Abstract: Abstract Carbon nanodots are a new and intriguing class of fluorescent carbon nanomaterials and are considered a promising low cost, nontoxic alternative to traditional inorganic quantum dots in applications such as bioimaging, solar cells, ... ...

    Abstract Abstract Carbon nanodots are a new and intriguing class of fluorescent carbon nanomaterials and are considered a promising low cost, nontoxic alternative to traditional inorganic quantum dots in applications such as bioimaging, solar cells, photocatalysis, sensors and others. Despite the abundant available literature, a clear formation mechanism for carbon nanodots prepared hydrothermally from biomass precursors along with the origins of the light emission are still under debate. In this paper, we investigate the relationships between the chemical structure and optical properties of carbon nanodots prepared by the hydrothermal treatment of glucose. Our major finding is that the widely reported excitation-dependent emission originates from solvents used to suspend the as-prepared carbon nanodots, while emission from dry samples shows no excitation-dependence. Another important highlight is that the hydrothermal conversion of biomass-derivatives under subcritical conditions leads to a heterogeneous mixture of amorphous-like nanoparticles, carbon onion-type and crystalline carbons composed of at least three different phases. The potential chemical reaction pathways involved in the formation of these hydrothermal carbon products along with a comprehensive structural and optical characterization of these systems is also provided.
    Keywords Medicine ; R ; Science ; Q
    Subject code 540
    Language English
    Publishing date 2018-04-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top