Article
Chemistry, Multidisciplinary
Bruna Lallo da Silva, Laurent Lemaire, Jean-Pierre Benoit, Fernanda Hediger Borges, Rogeria Rocha Goncalves, Camila Fernanda Amantino, Fernando Lucas Primo, Leila Aparecida Chiavacci
Summary: The study focuses on the conjugation of Gd3+/ZnO with GCIS/ZnS Qdots to create a novel ZnOGd-GCIS/ZnS nanomaterial with excellent luminescence and MRI properties, showcasing potential as contrast agents. Structural and spectral analyses confirm the efficacy of the new quantum dots in MRI applications.
Article
Mathematics
Francesca Condino, Filippo Domma
Summary: In this work, a general framework for models with support in the unit interval is proposed using random variable transformations. The framework provides general expressions for distribution and density functions, as well as essential characteristics such as quantiles, moments, and hazard functions. By selecting appropriate transformations, different existing proposals can be seen as specific cases of this framework. Additionally, the focus is on unit-Dagum distributions, where the type I and type II unit-Dagum distributions are proposed using different transformations. Applications with data on the unit interval are also reported.
Article
Chemistry, Multidisciplinary
Yongfeng Liu, Xiuwen Shao, Zhaoju Gao, Qingyu Xie, Yupeng Ying, Xiaolin Zhu, Zhangcheng Pan, Jinpeng Yang, Hao Lin, Xiaosheng Tang, Weiwei Chen, Wei Pei, Yusong Tu
Summary: We have developed an in-situ and general multidentate ligand passivation strategy to achieve CsPbX3 PeQDs with near-unit photoluminescence quantum yield (PLQY) and significantly improved stability. This study accelerates the commercialization process of PeQDs in WLEDs.
Article
Chemistry, Multidisciplinary
Cheng Shen, Xue Wang, Yuxue Wei, Fang Chen, Zhenzhen Zhuo, Mengdie Cai, Mengmeng Li, Song Sun
Summary: In this study, Zn1-x Cd x S/ZnO nanorod arrays on stainless steel were fabricated via an in situ growth method, achieving an electronic-level contact between Zn1-x Cd x S and ZnO. The separation and migration of photogenerated charge carriers in Zn1-x Cd x S were significantly improved by the piezoelectric effect induced by ZnO under mechanical vibration. As a result, the H(2) production rate of Zn1-x Cd x S/ZnO nanorod arrays under solar and ultrasonic irradiation achieved 20.96 mu mol h(-1) cm(-2), which is 4 times higher than that under solar irradiation. This research provides a new strategy for highly efficient piezo-photocatalytic H-2 production by coupling polarized materials and semiconductors.
Article
Chemistry, Physical
Chunmei Li, Hua Lin, Maoxiang Jing, Lian Ying Zhang, Weiyong Yuan, Chang Ming Li
Summary: The performance of photoelectrochemical water splitting is limited by the photoanode reaction. In this study, high-density CdS nanosheets were grown on ZnO nanowire arrays using a sequential self-assembly approach. The obtained nanostructured array showed superior photocurrent density and photoconversion efficiency, which can be attributed to the CdS nanosheet layer.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Multidisciplinary
Helen Werner, Shalmali Bapat, Michael Schobesberger, Doris Segets, Sebastian P. Schwaminger
Summary: The experiments showed that residual kidney stone fragments can lead to recrystallization, highlighting the importance of establishing a model to study the size and crystal structure of these fragments. Results indicated that particle sizes increase with increasing supersaturation, energy input, and pH, providing valuable insights for understanding and controlling the crystallization and aggregation of calcium oxalate.
Article
Polymer Science
Bjoern Duesenberg, Sebastian-Paul Kopp, Florentin Tischer, Stefan Schruefer, Stephan Roth, Jochen Schmidt, Michael Schmidt, Dirk W. Schubert, Wolfgang Peukert, Andreas Buck
Summary: This study investigates the use of charge control substances (CCS) as additives for polymer powders in powder-based additive manufacturing. Functionalization of commercially available polymer powder with CCS is shown to have an impact on powder charge and the potential of this method is demonstrated through analysis of various parameters.
Article
Electrochemistry
Adil Amin, Moritz Loewenich, Stefan O. Kilian, Theresa Wassmer, Stefan Bade, Julia Lyubina, Hartmut Wiggers, Fatih Ozcan, Doris Segets
Summary: A one-step non-reactive spray drying approach was used to produce hierarchically structured supraparticles of silicon/carbon composite nanoparticles for LIB anodes. The supraparticles showed good redispersion stability, improved density of the coated layer, and excellent cycling stability. This research provides a scalable and cost-effective method for manufacturing Si-based anode materials and highlights the significance of hierarchical electrode structures in electrochemistry.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Stefan Neumann, Azita Rezvani, Matthaeus Barasinski, Georg Garnweitner, Doris Segets, David Rafaja
Summary: This paper presents a multiscale approach using transmission electron microscopy (TEM) to study the characteristics of gold nanocrystals (NCs). The approach combines high-resolution TEM to observe the atomic-scale features of NCs with a semi-automatic analysis of low-magnification high-angle annular dark-field scanning TEM images to provide statistical information about the morphological attributes of NCs. The results of these complementary techniques are combined and correlated to quantify and understand the crystallographic orientations, configurations, and defects of different types of gold nanocrystals.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Zhuang Wang, Doris Segets
Summary: We propose a new platform for the continuous synthesis of InP-based quantum dots (QDs) using a greener aminophosphine as the phosphorus precursor. The compact reactor configuration and premixed precursor solution allow for the successful synthesis of InP QDs with tunable sizes and narrow particle size distribution. Additionally, InP/ZnS core/shell QDs were also synthesized, achieving a photoluminescence quantum yield of 30.9% without optimization of the synthesis protocol.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Energy & Fuels
Theresa Jaster, Simon Albers, Armin Leonhard, Mena-Alexander Kraeenbring, Heiko Lohmann, Barbara Zeidler-Fandrich, Fatih Ozcan, Doris Segets, Ulf-Peter Apfel
Summary: In this study, the influence of electrode structuring and pre-treatment on the electrochemical CO2 reduction reaction (CO2RR) was investigated. The modification of the catalyst environment, such as ink composition and electrode treatment, was found to affect the CO2RR performance. The study showed that selecting proper catalysts and optimizing gas diffusion electrodes can reduce parasitic hydrogen formation and flooding behavior, and enhance C2+ product formation.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Analytical
Uwe Frank, Jana Dienstbier, Florentin Tischer, Simon E. E. Wawra, Lukas Gromotka, Johannes Walter, Frauke Liers, Wolfgang Peukert
Summary: The increasing complexity in particle science and technology requires the ability to deal with multidimensional property distributions. We present the theoretical background for multidimensional fractionations by transferring the concepts known from one dimensional to higher dimensional separations. Examples of technical realizations for shape-selective separation in a hydrocyclone and for density-selective separation in a disc separator are given.
Article
Chemistry, Analytical
Malvina Supper, Virginia Birner, Lukas Gromotka, Wolfgang Peukert, Malte Kaspereit
Summary: Alternate pumping chromatography is used to obtain high purity glutathione-stabilized gold nanoclusters with atomic precision from synthesized mixtures. Anion exchange chromatography is applied to isolate a single cluster, Au10GSH10, as well as two different clusters simultaneously (Au25GSH(18) and Au(29)GSH(20)). Trace amounts of Au(18)GSH(14) are successfully enriched. A simple design procedure allows for the use of columns with different retention behavior. Successful experiments with large injection amounts confirm the potential of this concept for preparative-scale productions of high-quality nanoparticulate products.
Article
Chemistry, Physical
Osama Anwar, Amin Said Amin, Adil Amin, Mena-Alexander Kraenbring, Fatih Ozcan, Doris Segets
Summary: Hansen solubility parameters (HSPs), understood as Hansen similarity parameters, provide valuable information about nanoparticle surface behavior. Different methods for scoring and ranking probe liquids for HSP determination have been developed. This study applies two structured methods, based on integral extinctions (IE) and particle size determinations, to titania, carbon black, and silicon/carbon composites. The differences in scoring and ranking of probe liquids between the two methods are compared, and considerations for deriving HSPs from the IE-based method are emphasized.
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Osama Anwar, Shalmali Bapat, Jalil Ahmed, Xiaofeng Xie, Jing Sun, Doris Segets
Summary: This study investigates the Hansen solubility/similarity parameters for analyzing and evaluating the surface behavior of Titania photocatalysts synthesized by different methods. A categorization scheme based on particle size distribution is introduced to characterize each material's Hansen parameters. Comparison of the Hansen parameters shows the potential use of HSPs as a model for predicting pollutant adsorption behavior on the photocatalyst surface.
Article
Chemistry, Multidisciplinary
Shalmali Bapat, Stefan O. Kilian, Hartmut Wiggers, Doris Segets
Summary: Understanding complex interactions in particulate systems is crucial for knowledge-based formulations. Hansen solubility parameters are used to assess compatibility between dispersed and continuous phases. A combinatorics-based procedure is introduced to evaluate and report particle HSP values, demonstrated through experiments with SiNx particles.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Daniel Siegmund, Sebastian Metz, Volker Peinecke, Terence E. Warner, Carsten Cremers, Anna Greve, Tom Smolinka, Doris Segets, Ulf-Peter Apfel
Summary: The increasing societal and political focus on environmentally friendly technologies has led to a growing interest in electrolysis technologies in the scientific community, but few catalysts have actually been applied. Reports on process engineering do not adequately address the utilization of these catalysts, signaling the need for closer collaboration between industry and academia to accelerate the development of these technologies.
Article
Nanoscience & Nanotechnology
Shalmali Bapat, Doris Segets
ACS APPLIED NANO MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Sebastian Suess, Katja Bartsch, Christina Wasmus, Cornelia Damm, Doris Segets, Wolfgang Peukert
Article
Chemistry, Multidisciplinary
Stefan Neumann, Christina Menter, Ahmed Salaheldin Mahmoud, Doris Segets, David Rafaja
