The Surface Evolver was used to calculate the equilibrium microstructure of random monodisperse soap froth, starting from Voronoi partitions of randomly packed spheres. The sphere packing has a strong influence on foam properties, such as E (surface free energy) and
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Dendrimers, Dendrons, and the Dendritic State: Reflection on the Last Decade with Expected New Roles in Pharma, Medicine, and the Life Sciences.
Pharmaceutics
November 2024
The National Dendrimer & Nanotechnology Center, NanoSynthons LLC, Mt. Pleasant, MI 48858, USA.
This perspective begins with an overview of the major impact that the dendron, dendrimer, and dendritic state (DDDS) discovery has made on traditional polymer science. The entire DDDS technology is underpinned by an unprecedented new polymerization strategy referred to as step-growth, amplification-controlled polymerization (SGACP). This new SGACP paradigm allows for routine polymerization of common monomers and organic materials into precise monodispersed, dendritic macromolecules (i.
View Article and Find Full Text PDFCovalent Folding of Fluorinated Polyphenylene by Sulfur Fluorine Annulative Substitution.
Angew Chem Int Ed Engl
November 2024
School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China.
We report that fluorinated polyphenylene P50 undergoes folding-like sulfur fluorine annulative substitution (SFAS) to form a well-defined tubular helix H50. This is achieved with atomic precision in an exceptionally efficient manner, involving the simultaneous transformation of 98 C-F bonds with the yield per reaction site approaching 99.9 %.
View Article and Find Full Text PDFMicrostructural characterization of DEM-based random packings of monodisperse and polydisperse non-convex particles.
J Chem Phys
November 2024
Institute of Solid Mechanics, College of Mechanics and Engineering Science, Hohai University, Nanjing 211100, China.
Understanding of hard particles in morphologies and sizes on microstructures of particle random packings is of significance to evaluate physical and mechanical properties of many discrete media, such as granular materials, colloids, porous ceramics, active cells, and concrete. The majority of previous lines of research mainly dedicated microstructure analysis of convex particles, such as spheres, ellipsoids, spherocylinders, cylinders, and convex-polyhedra, whereas little is known about non-convex particles that are more close to practical discrete objects in nature. In this study, the non-convex morphology of a three-dimensional particle is devised by using a mathematical-controllable parameterized method, which contains two construction modes, namely, the uniformly distributed contraction centers and the randomly distributed contraction centers.
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- Miniature random lasers are important for fields like barcoding, bioimaging, and on-chip technologies, but creating size-tunable, biocompatible versions has been difficult.
- This study used poly(lactic-co-glycolic) acid (PLGA), a medical-approved material, to create monodisperse dye-doped PLGA spheres with controllable sizes from 25 to 52 µm.
- The spheres showed strong lasing emissions at wavelengths of 610-640 nm and a high quality factor of 3100, with detailed analysis providing insights into their structure.
Spontaneous Formation of π-Conjugated Polymeric Colloidal Molecules Through Stepwise Coacervation and Symmetric Compartmentalization.
Small
October 2024
Department of Materials Science, Institute of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Ibaraki, Tsukuba, 305-8573, Japan.
Coacervation, the phase separation of liquid induced by polymeric solutes, sometimes results in the formation of oligomeric clusters of droplets. The morphology of the clusters is non-uniform because the clustering is a consequence of the random collisions of the drifting droplets. Here we report distinctively organized coacervation, yielding colloidal molecules with monodisperse size, morphological symmetry, and compositional heterogeneity.
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