Charge Transfer from Lead Sulfide Quantum Dots to MoS2 Nanoplatelets

Optics and Spectroscopy - The research interest in the transition metal dichalcogenides (TMD) has been reborn a few years ago. This had happened due to the remarkable properties of monolayered TMD...     

Five Years of ChemRxiv: Where We Are and Where We Go From Here**

ChemRxiv was launched on August 15, 2017 to provide researchers in chemistry and related fields a home for the immediate sharing of their latest research. In the past five years, ChemRxiv has grown into the premier preprint server for the chemical sciences, with a global audience and a wide array of scholarly content that helps advance science more rapidly. On the service's fifth anniversary, we would like to reflect on the past five years and take a look at what is next for ChemRxiv.     

Assessment by the Fluorescence Imaging Methods of the Antitumor Efficacy and Apoptotic Activity of Biologically Active Additives Containing Resveratrol,Indole-3-Carbinol,and Cordycepin in Human Renal Carcinoma Cells

Optics and Spectroscopy - The efficacy of antitumor efficacy and apoptosis induction in A498 human renal cell carcinoma observed when applying extracts of cruciferous herbal material...     

The Influence of Long-Term Peroral Administration of Gold Nanoparticles with Various Sizes on the Liver,Spleen, and Lymph Nodes of Laboratory Rats and Their Progeny

Optics and Spectroscopy - The influence of long-term peroral injection of gold nanoparticles with various sizes on the liver, spleen, and lymph nodes of adult laboratory rats and their progeny was...     

Advantages and Possibilities of Fluorescence-Based Methods for the Visualization of Apoptosis and Autophagy in Human Tumor Cells in vitro

Optics and Spectroscopy - The possibilities of using fluorescence-based analytical methods and their advantages for visualization and identification of the type of programmed cell death in human...     

Ermittlung der Eigenschwingzahlen von durchlaufenden Trägern mit feldweise veränderlicher Längskraft

Ohne Zusammenfassung     

Structure–property relationships for film‐forming copoly(amide imide)s

Thin films of copoly(amide imide)s (coPAIs) from dichloro‐dianhydride of trimellitimide‐N‐acetic acid and mixtures of diphenylmethane diamine (DPA) and cardo 9,9′‐bis‐phenylfluorene diamine (CDA) cast from solutions in dimethylacetamide (DMAA) were characterized by wide‐angle and small‐angle X‐ray scattering (WAXS and SAXS), dynamic mechanical thermal analysis (DMTA) (temperature interval: 293–703 K, frequency range: 1–100 Hz), and thermogravimetric analysis (TGA) (nitrogen flux, temperature interval: 303–973 K). The mean interchain spacings (WAXS) smoothly increased with the CDA/DPA molar ratio from 0.55 nm for CDA/DPA = 0/1 up to 0.60 nm for CDA/DPA = 1/0. The smooth patterns of the SAXS curves for all coPAIs were explained by the smearing‐out of electron density differences between densely‐packed and loosely‐packed microregions of coPAIs due to the wide dispersion of their sizes. The step‐like patterns of the TGA traces in the temperature intervals below and above 600 K were associated with successive weight losses due to the evaporation of residual water and of DMAA, and to the thermal degradation of diamine and dianhydride chain fragments, respectively. As could be inferred from the TGA data, the loosely‐packed regions comprise about 25–35% of the total volume of studied coPAIs. The mechanical relaxations observed in all coPAIs at T_β < T_α′ < T_α (DMA) were attributed to the onset of non‐cooperative segment motion in loosely‐packed regions, of cooperative segment motion in loosely‐packed regions, and of cooperative segment motion in densely‐packed regions, respectively. At constant frequency, the sub‐glass relaxations were roughly composition‐independent, while chain‐stiffening effect was assumed to be responsible for the smooth increase of T_α′ and T_α, as well as of the corresponding apparent activation energies with the CDA/DPA ratio. Copyright © 2003 John Wiley & Sons, Ltd.     

Structure‐property relationships for film‐forming poly(amide imide)s

Poly(amide imide)s from dichloro‐dianhydrides of tri‐mellitimide‐ and/or pyromellitimide‐N‐acetic acids (TMA and PMA), linear aromatic dimimines (LAD) and/or cardo diamine (CDA), 9,9′‐bis‐phenylfluorene (series PAI‐1); a similar series (PAI‐II) from dichloro‐dianhydride of trimellitimide‐N‐benzoic acid (TMB), LAD and/or CDA; and a series of coPAIs from dichloro‐dianhydride of TMA and mixtures of diphenylmethane diamine (DPA) with CDA were synthesized by low‐temperature reaction in dimethyl acetamide (DMAA). The state of aggregation of PAIs and coPAIs in dilute and semi‐dilute solutions of DMAA was characterized by measurements of specific heat capacity in the temperature interval 150‐370 K, of heats of dilution in DMAA at room temperature, and of apparent viscosity in the temperature interval 288‐373 K. The state of aggregation of PAIs and coPAIs in thin films cast from DMAA solutions was characterized by wide‐angle and small‐angle X‐ray diffraction, dynamic mechanical analysis, broad‐band dielectric spectroscopy and gas transport properties. It is concluded that film‐forming PAIs and coPAIs have a reasonably good potential as high‐temperature dielectrics and membrane materials for gas separation.     

Zur Ermittlung der Grundschwingungszahlen von durchlaufenden Trägern

Ohne ZusammenfassungFür die Anregung zu diesem Beitrag habe ich an dieser Stelle noch Herrn ProfessorK. Federhofer meiner Dank auszusprechen.     

Ionic conductivity and interfacial interaction in penton/AgI composites

New nanostructured composite system (1???x)penton/xAgI (where 0?< x?<?1) was synthesized by a solution-based technique, which involves the process of modification of polymer surface. Samples of the composite system were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and electrical impedance spectroscopy. It was shown that AgI nanoparticles form a continuous layer at the surface of penton particles and consist mainly of cubic γ-phase with a small amount of hexagonal β-phase. Maximum conductivity enhancement at almost one order of magnitude higher compared to the pristine AgI has been observed for the sample with x?=?0.5. The overall activation energy for conduction varies from 0.23 to 0.38 eV, depending on the content of γ-phase of silver iodide in the samples. Two percolation thresholds has been also recorded at the points x?=?0.1 and x?=?0.3.