TY - JOUR A1 - Miyata, Ayana A1 - Tokuda, Shun A1 - Kuzumoto, Mako A1 - Lee, Guan-Sian A1 - Yamashita, Masataka A1 - Nishiguchi, Taichi A1 - Negoro, Masaki A1 - Pauw, Brian Richard A1 - Chan, Yi-Tsu A1 - Kanamori, Kazuyoshi A1 - Urayama, Kenji A1 - Sugimoto, Kunihisa A1 - Furukawa, Shuhei T1 - One-Dimensional van der Waals Porous Fibrils Assembled from Metal–Organic Polyhedra N2 - Supramolecular systems exhibit collective functions that emerge from the hierarchical assembly of individual molecular building blocks. Metal−organic polyhedra (MOPs) are a class of functional supramolecular architectures with well-defined molecular geometry and an intrinsic cavity. In recent years, considerable progress has been made in assembling MOPs into extended networks to create porous solids. However, most reported MOP assemblies are limited to three-dimensional networks, which, owing to their high-dimensional connectivity, hinder effective stress dissipation and render them brittle under mechanical stress. Here, we report the one-dimensional (1D) self-assembly of MOPs into supramolecular polymeric aerogels that combine permanent microporosity with exceptional mechanical flexibility. The reaction between amino acid-functionalized naphthalenediimide (NDI) linkers and copper salts led to the synthesis of octahedral copper-based MOPs, followed by their spontaneous self-assembly to form supramolecular gels. The corresponding aerogels converted from the gels possessed uniform 1D fibrillar networks (14.8 ± 2.2 nm in width) with intrinsic microporosity derived from individual MOP cavities. The aerogel endured 87% compressive strain without fracture, demonstrating distinct ductility. Furthermore, these fibrils in the supramolecular gels were converted to crystals after 2 weeks. Single-crystal X-ray diffraction revealed that MOPs are arranged via face-to-face interaction between octahedral MOPs to form a 1D helical chain structure. An analysis of the self-assembly process using Hansen solubility parameters unveiled that solvent conditions with high polarity and low dispersion interaction drive the formation of anisotropic assemblies. This work provides a new strategy for tailoring the mechanical properties of supramolecular materials through dimensional control of their assemblies. KW - Aerogels KW - Crystals KW - Metal organic frameworks KW - Nanofibers KW - Solvents KW - X-ray scattering KW - SAXS KW - Nanostructure KW - Small-angle X-ray scattering PY - 2026 DO - https://doi.org/10.1021/jacs.5c21654 SN - 0002-7863 SP - 1 EP - 13 PB - American Chemical Society (ACS) AN - OPUS4-65776 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Meier, F. A1 - Drexel, R. A1 - Wiesner, Yosri A1 - Altmann, Korinna A1 - Bartczak, D. A1 - Alasonati, E. T1 - Nano-sized Polypropylene as a Promising Candidate Reference Material: Preparation, Characterization and Stability in Complex Matrices N2 - The lack of nanoplastic (NPs) reference materials capable of mimicking real-world scenarios is currently hampering the development of validated extraction techniques from complex matrices, the development of analytical approaches for robust identification and quantification, and the ability to use environmentally relevant test materials in (eco)toxicity testing and hazard assessment. Here, we present a strategy towards the development of a potential NP reference material based on nano-sized polyproplyene particles (nanoPP) developed within the EURAMET-funded PlasticTrace project (https://plastictrace.eu/). The strategy includes the preparation, the physicochemical characterization and the stability assessment of nanoPP in suspension both in its pristine state, but also when spiked into complex matrices like mineral water and milk. NanoPP was produced reproducibly in a top-down approach by crushing in acetone with an UltraTurrax, filtering and change of solvent to MilliQ water. The prepared nanoPP material was subjected to a comprehensive physicochemical characterization including e.g., DLS, PTA and AF4-MALS for particle size distribution assessment, PTA and SEM for particle number concentration determination, SEM and AFM for shape analysis and pyrolysis GC-MS for chemical identification. Performed studies showed that the prepared nanoPP material is irregularly shaped and highly polydisperse with a particle size of around 180 nm (e.g., Dh,z-ave from DLS) and a particle size distribution from around 15 nm up to 135 nm (radius of gyration Rg from AF4-MALS). Storage stability studies using DLS, PTA and AF4-MALS revealed nanoPP in aqueous suspension to be stable for at least 22 months with respect to particle size distribution and number concentration rendering it a promising NP candidate reference material. However, conducted spiking experiments in mineral water and milk showed a time-dependent agglomeration of nanoPP that needs further investigation. T2 - MICROPLASTICdays CY - Ljubliana, Slovenia DA - 03.02.2026 KW - Nanoplastics KW - Reference materials PY - 2026 AN - OPUS4-65769 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Meier, F. A1 - Altmann, Korinna T1 - Challenges in nanoplastic analysis: Reference materials, complex matrices, and limits of detection N2 - The growing concern over nanoplastic particles (< 1 µm) in food and the environment has intensified the need for robust analytical approaches to detect, quantify, and characterize these particles. But the lack is high of standardized and well-characterized reference materials that reflect environmentally relevant nanoplastics according to: • Size distribution • Low abundance • Chemical diversity • Surface properties • Behavior in complex matrices. This poster shows different methods like FFF and AF4-MALS and their results when measuring a nanoPP reference materials candidate. T2 - Analytica Conference 2026 CY - Munich, Germany DA - 24.03.2026 KW - Nanoplastics KW - Reference materials KW - AF4-MALS KW - FFF PY - 2026 AN - OPUS4-65770 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaeger, Carsten T1 - Untargeted Analysis of Leachables Released from Recycled Polyethylene Canisters N2 - Recycling existing materials and products as far as possible is an integral part of the circular economy. Plastic-based packaging, including containers for food and beverages but also for storing and transporting chemicals and dangerous goods, are presently made to a wide range from fossil resources. However, even for these “contact sensitive” products, there is still the aim of sustainability using recycled materials. For packings for the transport of dangerous goods, safety characteristics of the containments made from the “virgin” materials including polyethylene (PE) are well known and tested within the frame of their design type approval. Much less, however, is known about their counterparts made from recycled materials. Apart from material weaking, incorporation of residues into recycled plastics can cause contamination of the goods inside the packaging. To fill this gap, we have evaluated high-density PE (HDPE) canisters made from post-consumer waste towards release of plastic additives and contaminants such as residues from former contents. Using a comprehensive untargeted high-resolution mass spectrometry (HRMS) approach as well as thermal extraction-desorption gas chromatography-mass spectrometry (TED-GC/MS), we detected up to 870 distinct components depending on the type of stored chemical and storage duration. Most of the components were unique to or released in significantly higher amounts from recycled HDPE compared to conventional HDPE. 129 of the components could be identified and analyzed for functional use. The analysis revealed “cosmetics”, “fragrance” and “flavoring” as major associations next to known and expected uses in the field of “plastics”, indicating significant introduction of foreign contaminants into the product. We present details on the compound classes involved and discuss consequences for political targets on increasing recycling rates in this product segment. T2 - International Conference on Non-Target Screening CY - Erding, Germany DA - 13.10.2025 KW - Extractables KW - Leachables KW - Untargeted analysis KW - Recycling KW - Polyethylene PY - 2025 AN - OPUS4-65742 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -