A ternary organic solar cell (TOSC) P5 :PC 71 BM:Y6 (1:0.2:1) composed of an electron donor 3,4‐ethylenedioxythiophene (EDOT)/diketopyrrolopyrrole (DPP)‐containing [Pt] (II) polyyne oligomer P5 with the acceptors PC 71 BM and Y6 shows a significant enhancement of the average power conversion efficiency (PCE) to 16.0% in comparison to the reported binary organic solar cells (OSCs) ( P5 :PC 71 BM (1:1.4), PCE = 9.4%; P5 :Y6 (1:1.2), PCE = 14.8%). Photophysical investigations carried out on the two binaries and on the ternary highlight the role of PC 71 BM to increase the rise time of electron transfer and to decrease recombination processes. Investigations of Y6‐containing active layers by atomic force microscopy (AFM) and high‐resolution transmission electron microscopy (HR‐TEM) show the presence of fibers, which highlights the assistance of Y6 in the nanostructuration of the blends. The higher PCE of the TOSC is explained with larger values of short‐circuit current density ( J SC ) from a broader absorption range and a superior value of fill factor (FF) supported by the faster mobilities and more balanced µ e / µ h . This work spotlights the beneficial role of the two acceptors in the TOSC. It explains the achievement of the highest average PCE of 16.0% for [Pt] polyyne oligomers to this date.

Material extrusion, also known as Robocasting or Direct Ink Writing (DIW) is an efficient and eco-friendly additive manufacturing method for fabricating large and thick ceramic components, such as alumina. While screwbased extrusion is the prevalent approach due to its precise control over printing parameters, pneumatic-based extrusion is gaining attention for its suitability in automated processes and reduced handling requirements. However, pneumatic extrusion faces challenges, primarily the narrower range of printable rheological behavior. Achieving a balance between extrudability and the self-supporting capacity of printed structures is critical. Moreover, bubble elimination, easily addressed in screw-based extrusion, remains a significant challenge in pneumatic systems. To overcome these issues, optimal concentrations of dispersants, ceramic loading, and additives were determined to achieve the desired shear-thinning rheological properties suitable for pneumatic extrusion. Additionally, this study, by employing a rapid one-step ball milling method for suspension preparation, is somewhat unique, providing a streamlined alternative to traditional processes. A degassing study was conducted to minimize bubble formation, ensuring print quality. Using the optimized parameters, including extrusion pressure and layer height, complex structures were successfully printed. After sintering at 1450 degrees C, the samples exhibited a 99.5 % dense microstructure with an average grain size of 1.71 mu m. The alumina demonstrated excellent mechanical properties, achieving a hardness of 2094 HV at 1450 degrees C, which is well aligned with the literature.

LOW BANDGAP METALLOOLIGOMER FOR ORGANIC SOLAR CELLSAbdel-aziz wayzani a, Loic Le Pluart a, Cyprien Lemouchi a, Ganesh Sharma b, Pierre Harvey ca Laboratoire de Chimie Moléculaire et Thio-organique, ENSICAEN, Université Caen-Normandie, UMR CNRS 6507 & FR 3038, 6 boulevard Maréchal Juin, 14050 Caen, France.b LNM Institute of Information Technology (Deemed University), Jaipur 302031, Indiac Département de Chimie, Université de Sherbrooke, Sherbrooke, PQ J1K 2R1, CanadaInternational Conference on Hybrid and Organic PhotovoltaicsProceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)València, Spain, 2024 May 12th - 15thOrganizer: Bruno EhrlerOral, Abdel-aziz wayzani, presentation 080DOI: https://doi.org/10.29363/nanoge.hopv.2024.080Publication date: 6th February 2024Nowadays renewable energy technologies attracted a lot of attention due to the limitation of fossil fuel. One of the best renewable energy harvesting devices is organic solar cells (OSCs) as bulk heterojunction. The active layer is composed of a blend of donor usually a low bandgap conjugated polymer and acceptor like fullerene (PC71PM) or non-fullerene (Y6). Tremendous efforts have been devoted to increase the power conversion efficiencies (PCE) over 20%[1]. Recently metallooligomers containing Pt(II) metal based on DPP (diketopyrrolopyrrole) are well used, since they display additional optical and opto-electronic features that leads to ultrafast photoinduced electron transfer and the increase of excitons population[2]. The optoelectronic properties of metallooligomers containing OSCs can be enhanced by tuning the structure of DPP to enhance electronic transfer between donor and acceptor and improving π-π inter-chain aggregation by self-assembly to favor charge carrier's mobility. To enhance the optoelectronic properties and solar cell performances (PCE>15%), my project consists in enhancing the optoelectronic properties and solar cell performances by ① functionalization of the side chains from DPP core with an organizing group as triphenylene[3] with distinct spacers (length, aliphatic, axially conjugated heterocycle) (T) to improve molecular organization , ② the increase of the conjugated backbone planarity to decrease the bandgap (Eg)[4] and finally ③ preparing a new donor whose the molecular design combines the advantages of the two first strategies. References:[1] Zhu, L ; Ming, Z; Xu, J; Li, C; Yan, J; Guanqing, Z; Zhong, W; Hao, T; Song, J; Xue, X; Zhou, Z; Zeng, R; Zhu, H; Chen, C; Mackenzie, R; Zou, Y; Nelson, J; Zhang, Y; Sun, Y; Liu, F. Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology. Nature Materials. 2022, 21, 1-8.[2] Gao, H.; Yu, R.; Ma, Z.; Gong, Y.; Zhao, B.; Tan, Z. Journal of Polymer Science, 2022, 15, 865–916[3] Marineau-Plante, G.; Nos, M.; Gao, D.; Durandetti, M.; Lemouchi, C.; le Pluart, L.; Sharma, G. D.; Harvey, P. D. ACS Applied Polymer Materials 2021, 3, 1087–1096.[4] Qassab, M.; Lohier, J. F.; Marineau-Plante, G.; Wayzani, A. A.; Herbinet, R.; Durandetti, M.; Hardouin, J.; Karsenti, P. L.; Pluart, L. Le; Harvey, P. D.; Lemouchi, C.; Sharma, G. D. Role of 3,4-Ethylenedioxythiophene in the Enhancement of Optical and Charge Transport Properties of Low Band Gap Diketopyrrolopyrrole-Containing Metallooligomers Designed for Organic Solar Cells. ACS Appl Energy Mater. 2023, 6, 12452-12467Acknowledgements:I would like to express my sincere gratitude to my thesis director, Dr. Cyprien LEMOUCHI, and co-director, Prof. Loïc LE PLUART, for their steadfast support, priceless advice, and thought-provoking conversations during this academic journey. Furthermore, I would like to thank Professor Pierre Harvey of the Chemistry Department at Université de Sherbrooke in Sherbrooke, PQ J1K 2R1, Canada, for his collaboration and his knowledge in the field of photophysical property research. I am also appreciative of Professor Ganesh Sharma's assistance in assessing the effectiveness of solar cell research at the LNM Institute of Information Technology (Deemed University), Jaipur 302031, India. © FUNDACIO DE LA COMUNITAT VALENCIANA SCITOnanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.MATSUSPreviously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.International Conference on Hybrid and Organic PhotovoltaicsInternational Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and OptoelectronicsThe main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and OptoelectronicsThe International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

A platinum(II) polyyne/diketopyrrolopyrole-containing polymer of two different chain lengths, P (short) and P’ (long chain), were prepared in order to elucidate the reasons for the poor photoconversion efficiencies (PCEs) in bulk heterojunction solar cells recently reported in the Journal of Organometallic Chemistry (2019), 894, 1–9, whereas other solar cells using similar platinum(II) polyyne/diketopyrrolopyrole-containing polymers provided significantly better PCEs. Using thermodynamic arguments using electrochemical and spectroscopy data, quenching experiments of the fluorescence band of P using fullerene (PC 61 BM and PC 71 BM) nonfullerene (MCzM) acceptors, and testing photochemical stability of P and P’, three possible reasons were found. These reasons are the undetected photochemical instability of similar polymers used by Wong, and the likely inappropriate choice of electron acceptor (PC 61 BM) in this past investigation. Graphical Abstract

This work examines the influence of a phosphorus-based flame-retardant additive (Exolit) on the fire-behaviour and the residual mechanical properties of composite laminates manufactured by a thermo-consolidation process from unidirectional (UD) carbon fibers (C) and a PEKK (Polyether-ketone-ketone) thermoplastic associated with or without Exolit. Depending on the laminates lay-up (orthotropic or quasi-isotropic), the influence of Exolit on the thermal degradation, resulting from a kerosene flame exposure (116 kW/m(2) and 1100 degrees C), on the composites structural integrity was examined. The changes in the residual tensile properties (axial stiffness and strength) were compared with respect to the virgin materials (experiencing no prior flame exposure) in room temperature (RT) conditions post fire exposure. The discussions on fire- and mechanically-induced damage mechanisms are supported by fractographic analysis of specimens. It is therefore possible to better understand how the fire-induced damages within the laminates micro- and meso-structures modify the mechanical behaviour of flame-exposed laminates. Thus, the axial stiffness and strength decrease moderately (-6% and -18%, respectively) in quasi-isotropic laminates with respect to virgin specimens. In orthotropic laminates, the axial stiffness decreases by 15%, whereas the axial strength dramatically decreases (-55%). The obtained results suggests that the flame-retardant additive not only delays the thermal degradation of C/PEKK laminates but also efficiently contributes to maintain the structural integrity of the composites, hence resulting in good mechanical properties. The positive effect of Exolit is particularly noticeable in orthotropic laminates whose mechanical behaviour is driven by 0 degrees carbon fibers.

This article reports a novel synthetic methodology for preparing Bi2Te3 nanotubes as well as tailoring their size and aspect ratio, which provides a strong potential interest in the field of thermoelectrics. Bi2Te3 nanotubes were synthesized via a 1-dodecanethiol (DDT) assisted aqueous two-steps synthesis. One of its main advantages is to be easily scalable because it is carried under mild experimental conditions. The complexation of the capping ligand DDT to the bismuth yields to layered structural complexes Bi(DDT)3, which may act as a soft templates promoting the growth of Bi2Te3 nanotubes. The products were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX), Transmission Electron Microscopy (TEM) and High-Resolution Transmission Electron Microscopy (HRTEM). Microstructure investigations of powders show that the Bi2Te3 nanotubes are 200–500 nm long with an average diameter of 50–100 nm. The HR-TEM and selected area electron diffraction (SAED) results reveal the presence of 20–30 nanometers crystallized nanodomains and support the growth of the nanotubes via a rolling up mechanism of (a, b) planes. Using sodium dodecylbenzene-sulfonate (SDBS), as an additional structuring agent, lowers the yield of Bi2Te3 tubes synthesis and increases the heterogeneity of their size distribution. However, with an increased amount of SDBS very long Bi2Te3 (up to 20μm) tubes have been obtained. As a conclusion, using the capping ligand DDT allows obtaining Bi2Te3 nanotubes in mild conditions according to an easily scalable procedure. Moreover, for the first time the addition of another shape directing agent such as the surfactant SDBS in presence of DDT is shown to be a promising way to tune the dimensions and aspect ratio of these Bi2Te3 nanotubes, and as a consequence tailor their electronic properties, since the longest hollow Bi2Te3 tubes ever synthesized have been obtained.

This work consists in investigating the influence of the structural changes induced by annealing, such as the presence of a rigid amorphous fraction (RAF) and crosslinking, on the mechanical properties of polyphenylene sulfide (PPS) and the fracture mechanical behavior (particularly tenacity) of a Carbon/PPS laminated composite. The first part of the study aimed at obtaining PPS samples with different amounts of RAF, and in determining the conditions potentially favoring crosslinking. The results obtained on the matrix alone encouraged to transpose the mechanisms associated with the structural changes in PPS to the polymer phase in C/PPS laminated composites with woven-fibers reinforcement. The laminates have a [(+/-45?)]7 stacking sequence, whose overall mechanical response is controlled by the PPS matrix. The ultimate axial strength is little influenced (about 10% increase) by different annealing conditions with respect to as-received state. The optimum annealing conditions (230 ?C under air for 576 h) contribute to the improvement of the axial stiffness (doubled compared to the asreceived state). At the same time, the critical translaminar toughness (at initiation) is significantly increased (about 20%) and the translaminar failure is associated with a slower crack propagation.

This work examines the influence of a kerosene flame on the residual mechanical tensile properties of composite laminates manufactured by thermo-consolidation process from unidirectional (UD) carbon fibers and a Polyether Ketone Ketone (PEKK) thermoplastic. Considering laminates with two stacking sequences (orthotropic or quasiisotropic - QI), the influence of a kerosene flame exposure (116 kW/m2 and 1100 degrees C) on the composites structural integrity was examined as a function of exposure time (5-10-15min). The discussions on fire- and mechanicallyinduced damage mechanisms are supported by fractographic analysis of specimens. Not surprisingly, longer exposures to kerosene flame lead to gradually increasing damages within the laminates at different scales (micromeso-macro), ultimately resulting in degrading the bearing capabilities of the material. With respect to virgin specimens, the axial strength decreases by almost 60 and 40% (after a 15min exposure) in orthotropic and QI laminates, respectively. At the same time, the axial stiffness is about 30 and 20% lower (after a 15min exposure). Contrary to orthotropic laminates, two well-defined areas are observed through the thickness in QI laminates: a severely degraded one and a virtually undamaged one. The first one corresponding to the exposed surface side is significantly damaged (fibers oxidation and pyrolysis of the PEKK matrix leading to an extensive delamination). The second one corresponding to the back-surface side is characterized by two plies with very little damage. When loaded in tension, the "undamaged" plies are characterized by the breakage of 0 degrees fibers. This failure mechanism shows that these "undamaged" plies are capable to bear significant portions of the tensile loading contrary to orthotropic specimens in which extensive delamination prevails through the whole thickness.

Three ([Pt]-DPP)n polymers PA, PB, and PC bearing cyanobiphenyl, alkyloxyphenyl, and triphenylene self-assembling groups were synthesized. The optical, electrochemical, photophysical, and solar cel...

Direct nose-to-brain delivery has been raised as a non-invasive powerful strategy to deliver drugs to the brain bypassing the blood-brain barrier (BBB). This study aimed at preparing and characterizing an innovative composite formulation, associating the liposome and hydrogel approaches, suitable for intranasal administration. Thermosensitive gel formulations were obtained based on a mixture of two hydrophilic polymers (Poloxamer 407, P407 and Poloxamer 188, P188) for a controlled delivery through nasal route via liposomes of an active pharmaceutical ingredient (API) of potential interest for Alzheimer's disease. The osmolarity and the gelation temperature (T° sol-gel) of formulations, defined in a ternary diagram, were investigated by rheometry and visual determination. Regarding the issue of assays, a mixture composed of P407/P188 (15/1%, w/w) was selected for intranasal administration in terms of T° sol-gel and for the compatibility with the olfactory mucosal (280 ± 20 mOsmol, pH 6). Liposomes of API were prepared by the thin film hydration method. Mucoadhesion studies were performed by using mucin disc, and they showed the good natural mucoadhesive characteristics of in situ gel formulations, which increased when liposomes were added. The study demonstrated successful pharmacotechnical development of a promising API-loaded liposomes in a thermosensitive hydrogel intended for nasal Alzheimer's disease treatment.

We report the synthesis and characterization of a bis(diketopyrrolopyrrole) dimer-containing ligand in platinum(ii) polyyne oligomer P4 with very good photovoltaic performance, PCE = 9.54% (P4; Jsc = 16.24 mA cm−2, Voc = 0.89 V, FF = 0.66).

The three different Mollusk shells, Pecten maximus, Crepidula fornicata and Crassostrea gigas, were studied and compared with synthetic and commercial powders. All samples were analysed by X-ray diffraction, Quantitative phase analysis, and quantitative line broadening (microstructure) analysis using the Combined Analysis method. LDPE-CaCO3 composites were prepared in a twin screw extruder in the composition range of 0–10.8 filler content. Ultimate Mechanical properties of dog-bone type injection molded tensile specimens (ISO-527-2-5A) were measured. Results are showing that the biogenic calcium carbonate is less efficient in improving polyethylene stiffness than the synthetic ones, independently of its crystalline form, to use stearic acid coating allows an improvement of the matrix stiffening. The yield strength is unchanged whatever the kind of filler used.

In many applications such as cosmetics, emulsions are largely developed thanks to organic surfactants which lower the interfacial oil/water tension thus enhancing dispersions stability. However, molecular organic surfactants may be toxic to the skin as well as cause environmental contamination issues. The objective of the present work is to develop emulsions stabilized by natural particles such as montmorillonite. In particular, the influences of the dispersion and emulsification times as well as the homogenization process (high shear mixer or ultrasonication) were investigated. Obtained emulsions were conditioned at 40 degrees C and their properties were studied over 72 h. Macroscopic observations of stability with regards to creaming, emulsion microstructure characterization by optical microscopy as well as droplet size measurements were performed. The emulsion microstructure has been shown to be highly sensitive to the manufacturing parameters. When emulsification time increases, droplet size decreases leading to more stable emulsions. In addition, the macroscopic aspect of mixtures is mostly governed by the homogenization process as ultrasonication efficiently produces fully emulsified mixtures without creaming whereas high shear mixing does not. Therefore, the ultrasonication process is demonstrated as an efficient tool to produce homogeneous and stable Pickering emulsions without surfactant and displaying microscopic droplet sizes. It also constitutes a promising method to control parameters in industrial processes when manufacturing emulsions.

Polychloroprene (PCP) and chlorosulfonated polyethylene (CSM) rubbers undergo a multiple step degradation pathway involving a common dehydrochlorination step which causes HCl release from the macromolecules as evidenced by thermogravimetric analyses associated with operando FTIR analyses. Dehydrochlorination is detected at lower temperatures for CSM than for PCP. It is preceded by non-simultaneous and very distinctive desulfonation reaction at even lower temperatures as shown by chemical analyses of the evolved phase during a thermal treatment. Incorporation of Bi2O3, La2O3 and WO3 as potential fillers for lead-free radioprotective materials leads to diverse effect on the thermal stability of these rubbers. Whereas transition metal oxides do not affect the degradation mechanisms, bismuth oxide strongly promotes the dehydrochlorination reaction leading to a decrease of the rubbers thermal stability which is detrimental to the potential processability and recyclability of these materials.