Aggregate (Hoboken, N.J.)最新文献

Lignin, as one of the most abundant natural aromatic polymers, holds significant promise for high-value applications; however, its inherent dark coloration poses a major constraint for such uses. In this review, we systematically examine the key factors contributing to lignin's color, with a focus on structural alterations during extraction, the formation of chromophores, and the influence of molecular weight and morphology. We then provide a comprehensive overview of current decolorization strategies, including oxidative bleaching, hydroxyl shielding modification, physical methods, and biomass fractionation techniques. This review offers a detailed summary of both the mechanisms underlying lignin coloration and recent advances in decolorization, thereby providing valuable guidance for the optimization of whitening processes and facilitating the advanced utilization of lignin.

The electronic spectra and luminescence decay measurements at room temperature (RT) and 77 K have been recorded for pristine hexagonal and cubic CsCdCl₃ and for this material doped with Mn²⁺ or Fe³⁺. First-principles calculations have been performed in order to rationalize the results. The RT visible emission broad band of hexagonal CsCdCl₃ is due to [MnCl₆]⁴⁻ emission at two different Cd²⁺ sites. On cooling below RT, the Mn²⁺ emission weakens in intensity, and variable intensity near-ultraviolet emission bands are assigned to spin-orbit coupling mixed singlet and triplet ¹D₂, ³D_3,2,1 (4d⁹5s¹) → ¹A_1g (4d¹⁰) (O_h) transitions at C_3v and D_3d sites of Cd²⁺. Pristine cubic CsCdCl₃ exhibits two weak RT emission bands associated with tetrahedral and octahedral Mn²⁺ impurity. Doping hexagonal CsCdCl₃ with Fe³⁺ does not produce additional visible emissions and leads to quenching of Cd²⁺ emissions below RT. Very weak infrared emission from Fe³⁺ is observed. The thermoluminescence of cubic and hexagonal CsCdCl₃ is weak, but long-lasting persistent luminescence is obtained upon Mn²⁺ doping at a several percent level. Optical applications for anti-counterfeiting and information encryption are suggested.

This work presents a facile strategy to synthesize high-performance trichromatic carbon dots by precisely modulating the o-phenylenediamine/phytic acid molar ratio. Comprehensive experiments and theoretical calculations reveal three distinct emission origins: molecule states, carbon core states, and clusteroluminescence. Their excellent optical properties enable applications in tunable phosphor-converted LEDs, luminescent solar concentrators, and a self-powered integrated photovoltaic system (e70167).

This study presents a new class of amphiphilic porous frameworks constructed through ion-dipole interactions between anionic silicate cages and K⁺ ions. These materials uniquely integrate solid-state porosity, demonstrated by selective gas adsorption, with molecular-scale solution processability. Remarkably, the materials preserve the discrete integrity of their cages in solution, enabling host–guest recognition. They can also be reversibly regenerated, offering a versatile strategy for designing multifunctional, amphibious porous materials (e70157).

Since Aggregate's inaugural issue in December 2020, we have embarked on the wonderful journey to advance aggregate science — a research field dedicated to exploring the science beyond molecules. The past five years have witnessed the remarkable flourishing of this discipline, alongside the growing academic recognition of Aggregate. As we celebrate the 5-year anniversary, let us reflect on the past journey and envision the promising future (e70234).

This study presents a fimbriae-targeted SeVB⊃PQ complex for enhanced photodynamic therapy of periodontitis. The selenoviologen cyclophane host encapsulates a P. gingivalis-specific peptide, enabling precise bacterial binding and ROS generation upon light activation. This selective delivery enhances antimicrobial efficacy, restores subgingival microbiome homeostasis, and outperforms methylene blue in reducing inflammation and promoting tissue regeneration (e70159).

This work introduces a scalable strategy for fabricating monodisperse cluster-luminescent polymer microspheres via functional group engineering. The microspheres exhibit broad emission (400–700 nm) and low fluorescence coefficient of variation (CV < 3%), fulfilling requirements for routine flow cytometer calibration. More importantly, kilogram-scale synthesis could be achieved facilely, demonstrating industrial potential (e70176).

Zhang et al. developed a novel direct deaminative functionalization strategy based on N-nitroamine intermediates, overcoming the explosiveness of traditional diazonium salts to achieve safe and efficient transformation. This method covers over 170 substrates, supports gram-scale preparation and one-pot cross-coupling, provides a new avenue for the synthesis of organic optoelectronic materials. And its N-nitroamine intermediate mechanism supplements the theoretical framework of deaminative reactions.

Agents to combine functions simultaneously are highly needed but still challenging in synergistic therapy. Particularly, capabilities to deplete glutathione (GSH) in tumors and monitor their process are also important. Therefore, platinum(II) metallacycles are prepared by using aggregation-induced emission active ligands. Despite their similar structures, high emission for Mh1 is obtained (PLQY = 49.2%) in solids, but a PLQY of only 6.8% is recorded for Mh2. NIR emission in Mh2 can be turned-on in depleting GSH by releasing emissive ligands. Also, both type I and type II reactive oxygen species (ROS) are obtained in Mh2 nanoparticles. Due to the depletion of GSH and generation of ROS, oxidative stress in immunogenic cell death can be induced. By combining chemotherapy and photoimmunotherapy, synergistic therapy in vivo is obtained for Mh2-NPs to well inhibit the tumor growth, also showing antitumor immune effects in distant tumors. The work here provides some guidelines in designing the multi-functional agents, showing the great potentials in efficient cancer therapy.