Pritzel, Christian
Preferred name
Pritzel, Christian
4 results
Now showing 1 - 4 of 4
- Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Cement hydration kinetics followed by electron spin resonanceCement hydration is driven by a complex system of chemical reactions of several hydraulic binders and water that influence each other. Here we establish a method to measure the hydration kinetics of an individual clinker phase by electron spin resonance spectroscopy. The hydration of a Mn(II) doped crystalline phase can be analyzed from the decay of signals coming from the starting material and the formed product. Transformation times can be determined by modeling the time series of the signal intensities. The host of the dopant could be identified by combining evidence from different analytical techniques including diffraction and electron microscopy. The results about the reaction kinetics are compared to those obtained from caloric measurements. The method opens a way to study the hydration of different hydraulic binders in complex systems selectively, which includes the determination of induction periods and transformation times from in-situ measurements.Source Type:Article1 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Improved flexural strength and morphology of gypsum by wollastoniteThe role of β‐wollastonite on the flexural strength of gypsum obtained from the hydration of alpha‐hemihydrate was investigated in this work. Starting with a synthesized Xonotlite obtained from the industry, dehydration was carried out at 880°C giving rise to the β‐wollastonite which was identified by X‐ray diffraction. The pure gypsum samples were prepared and compared with 3% and 5% replacements of the wollastonite. Increased flexural strengths were observed for 2, 7 and 28 days of storage in room temperature, normal water, and cold water. It was remarkable that the strength in water storage increased. The crystal morphology of the obtained gypsum was also improved in the presence of β‐wollastonite.Source Type:Article4 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Nanodentistry aspects explored towards nanostructured ZrO2: Immobilizing zirconium-oxide nanotube coatings onto zirconia ceramic implant surfacesWe report on a facile strategy to impart nanostructured morphology to commercially available ceramic-preforms used for biomedical applications in the field of dentistry. This process involves the deposition of nanotubular zirconium-oxide (ZrNT) membranes onto zirconia (ZrO2) ceramic discs at ambient conditions. ZrNTs are fabricated via electrochemical anodization of zirconium foil in a one-pot synthesis. The ZrNT film is detached from the metal-foil using office-adhesive tape and freestanding ZrNT films were obtained via dissolution of adhesives in a solvent bath, which also facilitate the transfer of ZrNT film onto the ceramic. This simple technique allows to impart a robust micro-nanoscale structure to bulk-ceramics that can potentially offer insights into designing ‘smart’ implants in the field of ceramic-biomaterial applications.Source Type:Article3 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , The facilitated synthesis of core‐multi‐shell silica nanopArticles and its performance onto cementitious based system in comparison with commercial silica nanopArticlesThe implementation of nanopArticles in cementitious systems have been studied for long time, however the knowledge about the influence of nanosized part (e.g. silica nanopArticles) has still to be fulfilled. The enhancement of cementitious matrix, specifically in the ultra‐high‐performance‐concrete (UHPC) system, has always been focused by researchers in various means of investigation and the application of silica nanopArticle plays a significant role as one of the attempts. Different methods have been applied for synthesizing silica nanopArticles (including the core multi‐shell silica nanopArticle) within this study to simplify the process. Moreover, the comparison of two types of silica nanopArticle (synthesized and commercial) has been done in mean of character and effect to the cementitious systems by appropriate methods, to be named as: size distributions examination, microscopic methods, investigation of mechanical properties, phases composition, etc. In order to hamper crack propagation at the nanoscale, a brand‐new and simple synthesized core multi‐shell silica nanopArticle with a high specific surface area was able for the first time be applied to the scope of cementitious matrices with an impressive impact on the properties of the investigated UHPC systems. This silica nanopArticle performs double functions: as nanoscopic shock absorber and as an additive to achieve a homogeneous nanoscale elastomer distribution and thus generates positive influence not only on the properties of UHPC, but also on future solutions for materials and environmental issues. With deep and meticulous study in the future, this type of complex nanopArticle is promising great applications to give a hand to find the solution for raw materials and therefore being closer to the aim of greener construction industry.Source Type:Article4