keyword
https://read.qxmd.com/read/38530007/effects-of-zr-dopants-on-properties-of-ptni-nanoparticles-for-orr-catalysis-a-dft-modeling
#21
JOURNAL ARTICLE
Riccardo Farris, Boris V Merinov, Albert Bruix, Konstantin M Neyman
Pt-based alloys, such as Pt3Ni, are among the best electrocatalysts for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells. Doping of PtNi alloys with Zr was shown to enhance the durability of the operating ORR catalysts. Rationalizing these observations is hindered by the absence of atomic-level data for these tri-metallic materials, even when not exposed to the fuel cell operation conditions. This study aims at understanding structure-property relations in Zr-doped PtNi nanoparticles as a key to their ORR function...
March 28, 2024: Journal of Chemical Physics
https://read.qxmd.com/read/38530006/effect-of-polyacid-architecture-and-polycation-molecular-weight-on-lateral-diffusion-within-multilayer-films
#22
JOURNAL ARTICLE
Jordan Brito, Parin Purvin Shah, Aliaksei Aliakseyeu, Svetlana A Sukhishvili
Despite the potential use of polyelectrolyte multilayers for biomedical, separation, and energy applications, their dynamic properties are not sufficiently understood. In this work, center-of-mass diffusion of a weak polyacid-poly(methacrylic acid) (PMAA) of linear and 8-arm architecture (L-PMAA and 8-PMAA, respectively) and matched molecular weight-was studied in layer-by-layer (LbL) assemblies with poly(diallyldimethylammonium) chloride (PDADMAC) of varied molecular weight. The film deposition at low-salt, acidic conditions when PMAA was only partially ionized yielded thicker, more diffused layers with shorter PDADMAC chains, and bilayer thickness decreased for multilayers constructed with longer PDADMAC...
March 28, 2024: Journal of Chemical Physics
https://read.qxmd.com/read/38529820/synergistic-applications-of-cyclodextrin-based-systems-and-metal-organic-frameworks-in-transdermal-drug-delivery-for-skin-cancer-therapy
#23
REVIEW
Thomas Scattolin, Giovanni Tonon, Eleonora Botter, Viviana Claudia Canale, Mahdi Hasanzadeh, Denise Maria Cuscela, Annamaria Buschini, Atefeh Zarepour, Arezoo Khosravi, Marco Cordani, Flavio Rizzolio, Ali Zarrabi
This review article explores the innovative field of eco-friendly cyclodextrin-based coordination polymers and metal-organic frameworks (MOFs) for transdermal drug delivery in the case of skin cancer therapy. We critically examine the significant advancements in developing these nanocarriers, with a focus on their unique properties such as biocompatibility, targeted drug release, and enhanced skin permeability. These attributes are instrumental in addressing the limitations inherent in traditional skin cancer treatments and represent a paradigm shift towards more effective and patient-friendly therapeutic approaches...
March 26, 2024: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://read.qxmd.com/read/38529806/selective-duplex-formation-in-mixed-sequence-libraries-of-synthetic-polymers
#24
JOURNAL ARTICLE
Mohit Dhiman, Ronan Cons, Oliver N Evans, Joseph T Smith, Cecilia J Anderson, Rafel Cabot, Daniil O Soloviev, Christopher A Hunter
Recognition-encoded melamine oligomers (REMO) are synthetic polymers that feature an alternating 1,3,5-triazine-piperazine backbone and side-chains equipped with either a phenol or phosphine oxide recognition unit. An automated method for the solid-phase synthesis (SPS) of REMO of any specified sequence has been developed starting from dichlorotriazine monomer building blocks. Complementary homo-oligomers with either six phenols or six phosphine oxides were synthesized and shown to form a stable duplex in nonpolar solvents by NMR denaturation experiments...
March 26, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38529790/an-organometallic-swap-strategy-for-bottlebrush-polymer-protein-conjugate-synthesis
#25
JOURNAL ARTICLE
Bin Liu, Jacob Rodriguez, Landon J Kilgallon, Wencong Wang, Yuyan Wang, Aiden Wang, Yutong Dai, Hung V-T Nguyen, Bradley L Pentelute, Jeremiah A Johnson
Polymer-protein bioconjugation offers a powerful strategy to alter the physical properties of proteins, and various synthetic polymer compositions and architectures have been investigated for this purpose. Nevertheless, conjugation of molecular bottlebrush polymers (BPs) to proteins remains an unsolved challenge due to the large size of BPs and a general lack of methods to transform the chain ends of BPs into functional groups suitable for bioconjugation. Here, we present a strategy to address this challenge in the context of BPs prepared by "graft-through" ring-opening metathesis polymerization (ROMP), one of the most powerful methods for BP synthesis...
March 26, 2024: Chemical Communications: Chem Comm
https://read.qxmd.com/read/38529715/ultrathin-free-standing-porous-aromatic-framework%C3%A2-membranes-for-efficient-anion-transport
#26
JOURNAL ARTICLE
Wenguang Du, Lin Liu, Liying Yin, Bo Li, Yu Ma, Xiaoyu Guo, Hong-Ying Zang, Ning Zhang, Guangshan Zhu
Porous aromatic frameworks (PAFs) show promising potential in anionic conduction due to their high stability and customizable functionality. However, the insolubility of most PAFs presents a significant challenge in their processing into membranes and subsequent applications. In this study, continuous PAF membranes with adjustable thickness were successfully created using liquid-solid interfacial polymerization. The rigid backbone and the stable C-C coupling endow PAF membrane with superior chemical and dimensional stabilities over most conventional polymer membranes...
March 26, 2024: Angewandte Chemie
https://read.qxmd.com/read/38529583/recent-progress-and-prospects-of-dimer-and-multimer-acceptors-for-efficient-and-stable-polymer-solar-cells
#27
REVIEW
Jin-Woo Lee, Jin Su Park, Hyesu Jeon, Seungjin Lee, Dahyun Jeong, Changyeon Lee, Yun-Hi Kim, Bumjoon J Kim
High power conversion efficiency (PCE) and long-term stability are essential prerequisites for the commercialization of polymer solar cells (PSCs). Small-molecule acceptors (SMAs) are core materials that have led to recent, rapid increases in the PCEs of the PSCs. However, a critical limitation of the resulting PSCs is their poor long-term stability. Blend morphology degradation from rapid diffusion of SMAs with low glass transition temperatures ( T g s) is considered the main cause of the poor long-term stability of the PSCs...
March 26, 2024: Chemical Society Reviews
https://read.qxmd.com/read/38529581/-star-pcl-shape-memory-polymer-smp-scaffolds-with-tunable-transition-temperatures-for-enhanced-utility
#28
JOURNAL ARTICLE
Courteney T Roberts, Sarah K Beck, C Mabel Prejean, Lance M Graul, Duncan J Maitland, Melissa A Grunlan
Thermoresponsive shape memory polymers (SMPs) prepared from UV-curable poly(ε-caprolactone) (PCL) macromers have the potential to create self-fitting bone scaffolds, self-expanding vaginal stents, and other shape-shifting devices. To ensure tissue safety during deployment, the shape actuation temperature ( i.e. , the melt transition temperature or T m of PCL) must be reduced from ∼55 °C that is observed for scaffolds prepared from linear -PCL-DA ( M n ∼ 10 kg mol-1 ). Moreover, increasing the rate of biodegradation would be advantageous, facilitating bone tissue healing and potentially eliminating the need for stent retrieval...
March 26, 2024: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://read.qxmd.com/read/38529557/form-ii-to-form-i-transition-in-solution-crystallized-isotactic-polybutene-1
#29
JOURNAL ARTICLE
Peng Fu, Jiaxin Huo, Jingqing Li, Claudio De Rosa, Shichun Jiang
Different polymer chains in a solution or melt have different conformations with corresponding entropy at each moment, which would be confined after crystallization. Equilibrium concept-based conformation or conformational entropy depends on chain dynamics, which is related to the effect of energy on conformational changes in polymer chains. Herein, an isotactic polybutene-1 (iPB-1) crystal was crystallized from solution by adding a precipitant at various temperatures. The solution-crystallized iPB-1 crystal was heated to 100 °C to obtain form II at different heat rates and the transition of form II was characterized...
March 26, 2024: Soft Matter
https://read.qxmd.com/read/38529543/antimicrobial-effects-of-silver-nanoparticle-microspots-on-the-mechanical-properties-of-single-bacteria
#30
JOURNAL ARTICLE
Giada Caniglia, Dimitrios Valavanis, Gözde Tezcan, Joshua Magiera, Holger Barth, Joachim Bansmann, Christine Kranz, Patrick R Unwin
Silver nanoparticles (AgNPs) conjugated with polymers are well-known for their powerful and effective antimicrobial properties. In particular, the incorporation of AgNPs in biocompatible catecholamine-based polymers, such as polydopamine (PDA), has recently shown promising antimicrobial activity, due to the synergistic effects of the AgNPs, silver(I) ions released and PDA. In this study, we generated AgNPs-PDA-patterned surfaces by localised electrochemical depositions, using a double potentiostatic method via scanning electrochemical cell microscopy (SECCM)...
March 26, 2024: Analyst
https://read.qxmd.com/read/38529541/empowering-ultrathin-polyamide-membranes-at-the-water-energy-nexus-strategies-limitations-and-future-perspectives
#31
REVIEW
Pulak Sarkar, Chenyue Wu, Zhe Yang, Chuyang Y Tang
Membrane-based separation is one of the most energy-efficient methods to meet the growing need for a significant amount of fresh water. It is also well-known for its applications in water treatment, desalination, solvent recycling, and environmental remediation. Most typical membranes used for separation-based applications are thin-film composite membranes created using polymers, featuring a top selective layer generated by employing the interfacial polymerization technique at an aqueous-organic interface. In the last decade, various manufacturing techniques have been developed in order to create high-specification membranes...
March 26, 2024: Chemical Society Reviews
https://read.qxmd.com/read/38528771/large-area-ultrathin-metal-organic-framework-membranes-fabricated-on-flexible-polymer-supports-for-gas-separations
#32
JOURNAL ARTICLE
Yueyao Liang, Zhengqing Zhang, Aibing Chen, Caijiao Yu, Yuxiu Sun, Juan Du, Zhihua Qiao, Zhi Wang, Michael D Guiver, Chongli Zhong
Ultrathin continuous metal-organic framework (MOF) membranes have the potential to achieve high gas permeance and selectivity simultaneously for otherwise difficult gas separations, but with few exceptions for zeolitic-imidazolate frameworks (ZIF) membranes, current methods cannot conveniently realize practical large-area fabrication. Here, we propose a ligand back diffusion-assisted bipolymer-directed metal ion distribution strategy for preparing large-area ultrathin MOF membranes on flexible polymeric support layers...
March 25, 2024: Angewandte Chemie
https://read.qxmd.com/read/38528424/14-electron-redox-chemistry-enabled-by-salen-based-%C3%AF-conjugated-framework-polymer-boosting-high-performance-lithium-ion-storage
#33
JOURNAL ARTICLE
Xinlu Zhang, Seyedeh Alieh Kazemi, Xingtao Xu, Jonathan P Hill, Jiachen Wang, Haibo Li, Saad M Alshehri, Tansir Ahamad, Yoshio Bando, Yusuke Yamauchi, Yun Wang, Likun Pan
A paucity of redox centers, poor charge transport properties, and low structural stability of organic materials obstruct their use in practical applications. Herein, these issues have been addressed through the use of a redox-active salen-based framework polymer (RSFP) containing multiple redox-active centers in π-conjugated configuration for applications in lithium-ion batteries (LIBs). Based on its unique architecture, RSFP exhibits a superior reversible capacity of 671.8 mAh g-1 at 0.05 A g-1 after 168 charge-discharge cycles...
March 25, 2024: Small
https://read.qxmd.com/read/38528372/a-portable-array-visualization-device-integrating-sample-preparation-and-detection-all-in-one-for-the-on-site-analysis-of-complex-samples
#34
JOURNAL ARTICLE
Dan Li, Zhiming Huo, Ling Xia, Xiaohua Xiao, Gongke Li
A gas membrane separation/array fluorescence visualization (GMS/AFV) device is developed by integrating hydrazine-based carbonized copolymer dots (PD-N2 H4 ) for visual on-site analysis. The novel PD-N2 H4 was synthesized using a "polymer template" approach, exhibiting strong blue fluorescence capable of visual sensing. The GMS/AFV device integrates sample preparation and detection all-in-one, consisting of a smartphone, a sample pretreatment system, and an optical system. In the detection procedure, the samples will be treated in the sample pretreatment system to create volatile gases...
March 25, 2024: Analytical Chemistry
https://read.qxmd.com/read/38527009/temperature-controlled-molecular-bonding-hysteresis-interphase-dynamics-of-a-nanoparticle-modified-polymer-network
#35
JOURNAL ARTICLE
Andreas Klingler, Bernd Wetzel, Jan-Kristian Krüger
This study demonstrates the existence of temperature-induced molecular bonding hysteresis at nanoparticle-polymer interfaces in a highly cross-linked epoxy-based polymer, modified with core-shell rubber nanoparticles. This thermally induced bond hysteresis manifests itself in a hysteresis-like change of the strength of the electrical bond polarization between epoxy molecules and surface molecules of the core-shell nanoparticles. This kind of dynamic bond behavior can be controllably switched from one bond state to the other by a sufficient temperature change...
March 25, 2024: Journal of Physical Chemistry Letters
https://read.qxmd.com/read/38526436/surface-hopping-simulations-on-charge-photogeneration-in-conjugated-polymers
#36
JOURNAL ARTICLE
Zhen Sun, Sheng Li, Yan Meng, Zhong An
The mechanism of charge photogeneration in neat conjugated polymers has long been controversial and a unified explanation has not been achieved so far. In this paper, we use a surface hopping method to simulate the excited-state dynamics of a system composed of five π-stacked polymer chains. In this system, polaron pairs (PPs) with large electron-hole distance can be seen as free charges. The surface hopping method is based on the Pariser-Parr-Pople (PPP) Hamiltonian and the excited states of the system are calculated with configuration interaction singles (CIS) formalism...
March 25, 2024: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/38526332/multipolar-conjugated-polymer-framework-derived-ionic-sieves-via-electronic-modulation-for-long-life-all-solid-state-li-batteries
#37
JOURNAL ARTICLE
Xue Yang, Long Fang, Jing Li, Cong Liu, Linfeng Zhong, Fan Yang, Xiaotong Wang, Zishou Zhang, Dingshan Yu
Here, we build a tunable multipolar conjugated polymer framework platform via pore wall chemistry to probe the role of electronic structure engineering in improving the Li+ conduction by theoretical studies. Guided by theoretical prediction, we develop a new cyano-vinylene-linked multipolar polymer framework namely CNF-COF, acting as efficient ion sieves to modify polymer electrolytes for long-lifespan all-solid-state (ASS) Li metal batteries. The cyano and fluorine groups dual-decoration in CNF-COF favorably regulates the electronic structure via multipolar donor-acceptor electronic effects to afford proper energy band structure and abundant electron-rich sites for enhanced anti-oxidative ability, facilitated ion-pair dissociation and suppressed anion movements...
March 25, 2024: Angewandte Chemie
https://read.qxmd.com/read/38526229/mechanism-guided-discovery-of-cleavable-comonomers-for-backbone-deconstructable-poly-methyl-methacrylate
#38
JOURNAL ARTICLE
Kwangwook Ko, David J Lundberg, Alayna M Johnson, Jeremiah A Johnson
The development of cleavable comonomers (CCs) with suitable copolymerization reactivity paves the way for the introduction of backbone deconstructability into polymers. Recent advancements in thionolactone-based CCs, exemplified by dibenzo[c,e]-oxepine-5(7H)-thione (DOT), have opened promising avenues for the selective deconstruction of multiple classes of vinyl polymers, including polyacrylates, polyacrylamides, and polystyrenics. To date, however, no thionolactone CC has been shown to copolymerize with methacrylates to an appreciable extent to enable polymer deconstruction...
March 25, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38526055/ptcu-alloy-modified-triptycene-based-polymer-with-charge-separation-for-photocatalytic-hydrogen-evolution-from-water-seawater
#39
JOURNAL ARTICLE
Jian Zhang, Xinglong Li, Zheng Peng, Xiuzheng Deng, Yanan Wang, Zhongyu Li, Qian Liang
Direct photocatalytic hydrogen from earth-abundant seawater is a great potential way to achieve sustainable and clean energy, yet unsatisfactory decomposition and rapid electron-hole pair recombination of catalysts hinder the solar-driven H2 conversion efficiency. Herein, we designed a series of PtCu alloy nanoparticle-modified porous triptycene-based polymers (Pt x Cu1 -TCP) to construct the heterostructure for highly efficient hydrogen generation from photocatalytic water/seawater splitting. Characterizations displayed that TCP with an ultrahigh surface area can confine the agglomeration of PtCu alloy; meanwhile, the PtCu alloy can facilitate the rapid electron transfer from TCP...
March 25, 2024: Inorganic Chemistry
https://read.qxmd.com/read/38526053/rational-design-of-an-in-situ-polymer-inorganic-hybrid-solid-electrolyte-interphase-for-realising-stable-zn-metal-anode-under-harsh-conditions
#40
JOURNAL ARTICLE
Ruwei Chen, Wei Zhang, Chaohong Guan, Yundong Zhou, Ian Gilmore, Hao Tang, Zhenyu Zhang, Haobo Dong, Yuhang Dai, Zijuan Du, Xuan Gao, Wei Zong, Yewei Xu, Peie Jiang, Jiyang Liu, Fangjia Zhao, Jianwei Li, Xiaohui Wang, Guanjie He
The in-depth understanding of the composition-property-performance relationship of solid electrolyte interphase (SEI) is the basis of developing a reliable SEI to stablize the Zn anode-electrolyte interface, but it remains unclear in rechargeable aqueous zinc ion batteries. Herein, a well-designed electrolyte based on 2M Zn(CF3SO3)2-0.2M acrylamide-0.2M ZnSO4 is proposed. A robust polymer (polyacrylamide)-inorganic (Zn4SO4(OH)6.xH2O) hybrid SEI is in-situ constructed on Zn anodes through controllable polymerization of acrylamide and coprecipitation of SO42- with Zn2+ and OH-...
March 25, 2024: Angewandte Chemie
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