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  • 1.
    Apostolopoulou-Kalkavoura, Varvara
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Munier, Pierre
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Bergström, Lennart
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Thermally Insulating Nanocellulose-Based Materials2021Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 33, nr 28, artikkel-id 2001839Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Thermally insulating materials based on renewable nanomaterials such as nanocellulose could reduce the energy consumption and the environmental impact of the building sector. Recent reports of superinsulating cellulose nanomaterial (CNM)-based aerogels and foams with significantly better heat transport properties than the commercially dominating materials, such as expanded polystyrene, polyurethane foams, and glass wool, have resulted in a rapidly increasing research activity. Herein, the fundamental basis of thermal conductivity of porous materials is described, and the anisotropic heat transfer properties of CNMs and films with aligned CNMs and the processing and structure of novel CNM-based aerogels and foams with low thermal conductivities are presented and discussed. The extraordinarily low thermal conductivity of anisotropic porous architectures and multicomponent approaches are highlighted and related to the contributions of the Knudsen effect and phonon scattering.

  • 2. Barriga, Hanna M. G.
    et al.
    Pence, Isaac J.
    Holme, Margaret N.
    Doutch, James J.
    Penders, Jelle
    Nele, Valeria
    Thomas, Michael R.
    Carroni, Marta
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    Stevens, Molly M.
    Coupling Lipid Nanoparticle Structure and Automated Single-Particle Composition Analysis to Design Phospholipase-Responsive Nanocarriers2022Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 34, nr 26, artikkel-id 2200839Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lipid nanoparticles (LNPs) are versatile structures with tunable physicochemical properties that are ideally suited as a platform for vaccine delivery and RNA therapeutics. A key barrier to LNP rational design is the inability to relate composition and structure to intracellular processing and function. Here Single Particle Automated Raman Trapping Analysis (SPARTA) is combined with small-angle X-ray and neutron scattering (SAXS/SANS) techniques to link LNP composition with internal structure and morphology and to monitor dynamic LNP-phospholipase D (PLD) interactions. This analysis demonstrates that PLD, a key intracellular trafficking mediator, can access the entire LNP lipid membrane to generate stable, anionic LNPs. PLD activity on vesicles with matched amounts of enzyme substrate is an order of magnitude lower, indicating that the LNP lipid membrane structure can be used to control enzyme interactions. This represents an opportunity to design enzyme-responsive LNP solutions for stimuli-responsive delivery and diseases where PLD is dysregulated.

  • 3.
    Boström, Hanna L. B.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Emmerling, Sebastian
    Heck, Fabian
    Koschnick, Charlotte
    Jones, Andrew J.
    Cliffe, Matthew J.
    Al Natour, Rawan
    Bonneau, Mickaele
    Guillerm, Vincent
    Shekhah, Osama
    Eddaoudi, Mohamed
    Lopez-Cabrelles, Javier
    Furukawa, Shuhei
    Romero-Angel, Maria
    Marti-Gastaldo, Carlos
    Yan, Minliang
    Morris, Amanda J.
    Romero-Muniz, Ignacio
    Xiong, Ying
    Platero-Prats, Ana E.
    Roth, Jocelyn
    Queen, Wendy L.
    Mertin, Kalle S.
    Schier, Danielle E.
    Champness, Neil R.
    Yeung, Hamish H. -M.
    Lotsch, Bettina V.
    How Reproducible is the Synthesis of Zr-Porphyrin Metal-Organic Frameworks? An Interlaboratory Study2024Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 36, nr 15, artikkel-id 2304832Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Metal-organic frameworks (MOFs) are a rapidly growing class of materials that offer great promise in various applications. However, the synthesis remains challenging: for example, a range of crystal structures can often be accessed from the same building blocks, which complicates the phase selectivity. Likewise, the high sensitivity to slight changes in synthesis conditions may cause reproducibility issues. This is crucial, as it hampers the research and commercialization of affected MOFs. Here, it presents the first-ever interlaboratory study of the synthetic reproducibility of two Zr-porphyrin MOFs, PCN-222 and PCN-224, to investigate the scope of this problem. For PCN-222, only one sample out of ten was phase pure and of the correct symmetry, while for PCN-224, three are phase pure, although none of these show the spatial linker order characteristic of PCN-224. Instead, these samples resemble dPCN-224 (disordered PCN-224), which has recently been reported. The variability in thermal behavior, defect content, and surface area of the synthesised samples are also studied. The results have important ramifications for field of metal-organic frameworks and their crystallization, by highlighting the synthetic challenges associated with a multi-variable synthesis space and flat energy landscapes characteristic of MOFs. It performed an interlaboratory study of the synthesis of the metal-organic frameworks (MOFs) PCN-222 and PCN-224. Ten participants independently synthesized the two MOFs and the products are analyzed, primarily by X-ray diffraction. The success rates are low (one-three samples corresponding to a pure sample of the correct phase), thus highlighting the problems with irreproducibility in MOF synthesis. image

  • 4.
    Chang, Jian
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Shi, Le
    Zhang, Miao
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Li, Renyuan
    Shi, Yifeng
    Yu, Xiaowen
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Pang, Kanglei
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Qu, Liangti
    Wang, Peng
    Yuan, Jiayin
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Tailor-Made White Photothermal Fabrics: A Bridge between Pragmatism and Aesthetic2023Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 35, nr 41, artikkel-id 2209215Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Maintaining human thermal comfort in the cold outdoors is crucial for diverse outdoor activities, e.g., sports and recreation, healthcare, and special occupations. To date, advanced clothes are employed to collect solar energy as a heat source to stand cold climates, while their dull dark photothermal coating may hinder pragmatism in outdoor environments and visual sense considering fashion. Herein, tailor-made white webs with strong photothermal effect are proposed. With the embedding of cesium–tungsten bronze (CsxWO3) nanoparticles (NPs) as additive inside nylon nanofibers, these webs are capable of drawing both near-infrared (NIR) and ultraviolet (UV) light in sunlight for heating. Their exceptional photothermal conversion capability enables 2.5–10.5 °C greater warmth than that of a commercial sweatshirt of six times greater thickness under different climates. Remarkably, this smart fabric can increase its photothermal conversion efficiency in a wet state. It is optimal for fast sweat or water evaporation at human comfort temperature (38.5 °C) under sunlight, and its role in thermoregulation is equally important to avoid excess heat loss in wilderness survival. Obviously, this smart web with considerable merits of shape retention, softness, safety, breathability, washability, and on-demand coloration provides a revolutionary solution to realize energy-saving outdoor thermoregulation and simultaneously satisfy the needs of fashion and aesthetics.

    Fulltekst (pdf)
    fulltext
  • 5.
    Di, Andi
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Schiele, Carina
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Hadi, Seyed Ehsan
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Bergström, Lennart
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Thermally Insulating and Moisture-Resilient Foams Based on Upcycled Aramid Nanofibers and Nanocellulose2023Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 35, nr 48, artikkel-id 2305195Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Low-density foams and aerogels based on upcycled and bio-based nanofibers and additives are promising alternatives to fossil-based thermal insulation materials. Super-insulating foams are prepared from upcycled acid-treated aramid nanofibers (upANFA) obtained from Kevlar yarn and tempo-oxidized cellulose nanofibers (CNF) from wood. The ice-templated hybrid upANFA/CNF-based foams with an upANFA content of up to 40 wt% display high thermal stability and a very low thermal conductivity of 18–23 mW m−1 K−1 perpendicular to the aligned nanofibrils over a wide relative humidity (RH) range of 20% to 80%. The thermal conductivity of the hybrid upANFA/CNF foams is found to decrease with increasing upANFA content (5–20 wt%). The super-insulating properties of the CNF-upANFA hybrid foams are related to the low density of the foams and the strong interfacial phonon scattering between the very thin and partially branched upANFA and CNF in the hybrid foam walls. Defibrillated nanofibers from textiles are not limited to Kevlar, and this study can hopefully inspire efforts to upcycle textile waste into high-performance products.

  • 6.
    Hakeem, A. S.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Daucé, R.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Leonova, E.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Edén, M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Shen, Z.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Grins, J.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Esmaeilzadeh, S.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Silicate glasses with unprecedented high nitrogen and electropositive metal contents obtained by using metals as precursors2005Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 17, s. 2214-2216Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

     

     

  • 7. Kokot, Hana
    et al.
    Kokot, Boštjan
    Sebastijanović, Aleksandar
    Voss, Carola
    Podlipec, Rok
    Zawilska, Patrycja
    Berthing, Trine
    Ballester‐López, Carolina
    Høgh Danielsen, Pernille
    Contini, Claudia
    Ivanov, Mikhail
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Krišelj, Ana
    Čotar, Petra
    Zhou, Qiaoxia
    Ponti, Jessica
    Zhernovkov, Vadim
    Schneemilch, Matthew
    Doumandji, Zahra
    Pušnik, Mojca
    Umek, Polona
    Pajk, Stane
    Joubert, Olivier
    Schmid, Otmar
    Urbančič, Iztok
    Irmler, Martin
    Beckers, Johannes
    Lobaskin, Vladimir
    Halappanavar, Sabina
    Quirke, Nick
    Lyubartsev, Alexander P.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Vogel, Ulla
    Koklič, Tilen
    Stoeger, Tobias
    Štrancar, Janez
    Prediction of Chronic Inflammation for Inhaled Particles: the Impact of Material Cycling and Quarantining in the Lung Epithelium2020Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 32, nr 47, artikkel-id 2003913Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    On a daily basis, people are exposed to a multitude of health-hazardous airborne particulate matter with notable deposition in the fragile alveolar region of the lungs. Hence, there is a great need for identification and prediction of material-associated diseases, currently hindered due to the lack of in-depth understanding of causal relationships, in particular between acute exposures and chronic symptoms. By applying advanced microscopies and omics to in vitro and in vivo systems, together with in silico molecular modeling, it is determined herein that the long-lasting response to a single exposure can originate from the interplay between the newly discovered nanomaterial quarantining and nanomaterial cycling between different lung cell types. This new insight finally allows prediction of the spectrum of lung inflammation associated with materials of interest using only in vitro measurements and in silico modeling, potentially relating outcomes to material properties for a large number of materials, and thus boosting safe-by-design-based material development. Because of its profound implications for animal-free predictive toxicology, this work paves the way to a more efficient and hazard-free introduction of numerous new advanced materials into our lives. 

  • 8. Li, Shaowen
    et al.
    Chai, Zhigang
    Wang, Zhaohui
    Tai, Cheuk-Wai
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Zhu, Jiefang
    Edström, Kristina
    Ma, Yue
    A Multiscale, Dynamic Elucidation of Li Solubility in the Alloy and Metallic Plating Process2023Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 35, nr 47, artikkel-id 2306826Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Li-containing alloys and metallic deposits offer substantial Li+ storage capacities as alternative anodes to commercial graphite. However, the thermodynamically in sequence, yet kinetically competitive mechanism between Li solubility in the solid solution and intermediate alloy-induced Li deposition remains debated, particularly across the multiple scales. The elucidation of the mechanism is rather challenging due to the dynamic alloy evolution upon the non-equilibrium, transient lithiation processes under coupled physical fields. Here, influential factors governing Li solubility in the Li-Zn alloy are comprehensively investigated as a demonstrative model, spanning from the bulk electrolyte solution to the ion diffusion within the electrode. Through real-time phase tracking and spatial distribution analysis of intermediate alloy/Li metallic species at varied temperatures, current densities and particle sizes, the driving force of Li solubility and metallic plating along the Li migration pathway are probed in-depth. This study investigates the correlation between kinetics (pronounced concentration polarization, miscibility gap in lattice grains) and rate-limiting interfacial charge transfer thermodynamics in dedicating the Li diffusion into the solid solution. Additionally, the lithiophilic alloy sites with the balanced diffusion barrier and Li adsorption energy are explored to favor the homogeneous metal plating, which provides new insights for the rational innovation of high-capacity alloy/metallic anodes.

  • 9. Parmar, Deependra
    et al.
    Mallette, Adam J.
    Yang, Taimin
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Zou, Xiaodong
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Rimer, Jeffrey D.
    Unique Role of GeO2 as a Noninvasive Promoter of Nano-Sized Zeolite Crystals2022Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 34, nr 49, artikkel-id 2205885Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The synthesis of zeolites with nano-sized dimensions is often limited to a narrow design space that conventionally relies upon the design of organics to direct hierarchical materials. Here, it is demonstrated that the addition of an inorganic modifier, germanium oxide (GeO2), to a zeolite growth mixture directs the formation of crystals with ultrasmall dimensions. This effect is observed for zeolites ZSM-11 and ZSM-5 over a range of synthesis conditions wherein the role of GeO2 in zeolite crystallization deviates from its typical function as a heteroatom. Notably, the final products contain trace amounts of Ge, which indicates the inorganic modifier does not compete for sites in the zeolite framework based on its formation of a discrete phase that enables GeO2 recovery. Catalytic tests using the methanol-to-hydrocarbons reaction reveal significant enhancement in the performance of zeolite catalysts prepared with GeO2 compared to reported examples of nano-sized zeolites. These findings highlight a potentially generalizable and commercially viable synthesis method to reduce mass-transport limitations in zeolites for diverse applications. 

  • 10. Qiu, Huibin
    et al.
    Sakamoto, Yasuhiro
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
    Terasaki, Osamu
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
    Che, Shunai
    A 2D-rectangular p2gg silica mesoporous crystal with elliptical mesopores: An intermediate phase of chiral and lamellar mesostructures2008Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 20, nr 3, s. 425-429Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    By adjusting the basicity of the reaction mixture in the cationic surfactant templating route, a systematic change from 2D-hexagonal chiral to 2D-rectangular p2gg to a lamellar silica mesostructure is precisely controlled. Detailed characterization shows that the novel 2D-rectangular p2gg silica mesoporous crystal exhibits elliptical mesopores peculiarly stacked with varying anisotropy on a 2D-hexagonal lattice, as shown in the figure.

  • 11.
    Shen, Zhijian
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Peng, Hong
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Nygren, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Formidable increase of superplasticity of ceramics in presence of an electric field2003Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 15, nr 12, s. 1006-1009Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ductility of silicon nitride-based ceramics is dramatically enhanced in the presence of a pulsed electric field/current that induces movement of the charged species present in the grain boundary glassy/liquid phase, and thereby promotes grain sliding along the grain boundaries. The Figure shows an α-sialon component before (right) and after (left) deformation.

  • 12. Wang, Yadong
    et al.
    Iyikanat, Fadil
    Rostami, Habib
    Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
    Bai, Xueyin
    Hu, Xuerong
    Das, Susobhan
    Dai, Yunyun
    Du, Luojun
    Zhang, Yi
    Li, Shisheng
    Lipsanen, Harri
    García de Abajo, F. Javier
    Sun, Zhipei
    Probing Electronic States in Monolayer Semiconductors through Static and Transient Third-Harmonic Spectroscopies2022Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 34, nr 3, artikkel-id 2107104Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Electronic states and their dynamics are of critical importance for electronic and optoelectronic applications. Here, various relevant electronic states in monolayer MoS2, such as multiple excitonic Rydberg states and free-particle energy bands are probed with a high relative contrast of up to ≥200 via broadband (from ≈1.79 to 3.10 eV) static third-harmonic spectroscopy (THS), which is further supported by theoretical calculations. Moreover, transient THS is introduced to demonstrate that third-harmonic generation can be all-optically modulated with a modulation depth exceeding ≈94% at ≈2.18 eV, providing direct evidence of dominant carrier relaxation processes associated with carrier–exciton and carrier–phonon interactions. The results indicate that static and transient THS are not only promising techniques for the characterization of monolayer semiconductors and their heterostructures, but also a potential platform for disruptive photonic and optoelectronic applications, including all-optical modulation and imaging.

  • 13.
    Zeglio, Erica
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för materialkemi. Karolinska Institute, Sweden; KTH Royal Institute of Technology and Digital Futures, Sweden.
    Wang, Yazhou
    Jain, Saumey
    Lin, Yunfan
    Ramirez, Alan Eduardo Avila
    Feng, Kui
    Guo, Xugang
    Ose, Helena
    Mozolevskis, Gatis
    Mawad, Damia
    Yue, Wan
    Hamedi, Mahiar Max
    Herland, Anna
    Mixing Insulating Commodity Polymers with Semiconducting n-type Polymers Enables High-Performance Electrochemical Transistors2024Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Diluting organic semiconductors with a host insulating polymer is used to increase the electronic mobility in organic electronic devices, such as thin film transistors, while considerably reducing material costs. In contrast to organic electronics, bioelectronic devices such as the organic electrochemical transistor (OECT) rely on both electronic and ionic mobility for efficient operation, making it challenging to integrate hydrophobic polymers as the predominant blend component. This work shows that diluting the n-type conjugated polymer p(N-T) with high molecular weight polystyrene (10 KDa) leads to OECTs with over three times better mobility-volumetric capacitance product (µC*) with respect to the pristine p(N-T) (from 4.3 to 13.4 F V−1 cm−1 s−1) while drastically decreasing the amount of conjugated polymer (six times less). This improvement in µC* is due to a dramatic increase in electronic mobility by two orders of magnitude, from 0.059 to 1.3 cm2 V−1 s−1 for p(N-T):Polystyrene 10 KDa 1:6. Moreover, devices made with this polymer blend show better stability, retaining 77% of the initial drain current after 60 minutes operation in contrast to 12% for pristine p(N-T). These results open a new generation of low-cost organic mixed ionic-electronic conductors where the bulk of the film is made by a commodity polymer.

  • 14.
    Zhou, Shiqi
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Zhao, Yunxuan
    Shi, Run
    Wang, Yucheng
    Ashok, Anumol
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Héraly, Frédéric
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Zhang, Tierui
    Yuan, Jiayin
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Vacancy-Rich MXene-Immobilized Ni Single Atoms as a High-Performance Electrocatalyst for the Hydrazine Oxidation Reaction2022Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 34, nr 36, artikkel-id 2204388Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Single-atom catalysts (SACs), on account of their outstanding catalytic potential, are currently emerging as high-performance materials in the field of heterogeneous catalysis. Constructing a strong interaction between the single atom and its supporting matrix plays a pivotal role. Herein, Ti3C2Tx-MXene-supported Ni SACs are reported by using a self-reduction strategy via the assistance of rich Ti vacancies on the Ti3C2Tx MXene surface, which act as the trap and anchor sites for individual Ni atoms. The constructed Ni SACs supported by the Ti3C2Tx MXene (Ni SACs/Ti3C2Tx ) show an ultralow onset potential of −0.03 V (vs reversible hydrogen electrode (RHE)) and an exceptional operational stability toward the hydrazine oxidation reaction (HzOR). Density functional theory calculations suggest a strong coupling of the Ni single atoms and their surrounding C atoms, which optimizes the electronic density of states, increasing the adsorption energy and decreasing the reaction activation energy, thus boosting the electrochemical activity. The results presented here will encourage a wider pursuit of 2D-materials-supported SACs designed by a vacancy-trapping strategy. 

  • 15. Zuo, Hongyu
    et al.
    Lyu, Baokang
    Yao, Jiaao
    Long, Wenhua
    Shi, Yu
    Li, Xinghao
    Hu, Huawei
    Thomas, Arne
    Yuan, Jiayin
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Hou, Bo
    Zhang, Weiyi
    Liao, Yaozu
    Bioinspired Gradient Covalent Organic Framework Membranes for Ultrafast and Asymmetric Solvent Transport2024Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gradients play a pivotal role in membrane technologies, e.g., osmotic energy conversion, desalination, biomimetic actuation, selective separation, and more. In these applications, the compositional gradients are of great relevance for successful function implementation, ranging from solvent separation to smart devices; However, the construction of functional gradient in membranes is still challenging both in scale and directions. Inspired by the specific function-related, graded porous structures in glomerular filtration membranes, a general approach for constructing gradient covalent organic framework membranes (GCOMx) applying poly (ionic liquid)s (PILs) as template is reported here. With graded distribution of highly porous covalent organic framework (COF) crystals along the membrane, GCOMx exhibts an unprecedented asymmetric solvent transport when applying different membrane sides as the solvent feed surface during filtration, leading to a much-enhanced flux (10–18 times) of the “large-to-small” pore flow comparing to the reverse direction, verified by hydromechanical theoretical calculations. Upon systematic experiments, GCOMx achieves superior permeance in nonpolar (hexane ≈260.45 LMH bar−1) and polar (methanol ≈175.93 LMH bar−1) solvents, together with narrow molecular weight cut-off (MWCO, 472 g mol−1) and molecular weight retention onset (MWRO, <182 g mol−1). Interestingly, GCOMx shows significant filtration performance in simulated kidney dialysis, revealing great potential of GCOMx in bionic applications. 

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