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Shao Y, Han D, Tao Y, Feng F, Han G, Hou B, Liu H, Yang S, Fu Q, Zhang WB. Leveraging Macromolecular Isomerism for Phase Complexity in Janus Nanograins. ACS CENTRAL SCIENCE 2023; 9:289-299. [PMID: 36844495 PMCID: PMC9951285 DOI: 10.1021/acscentsci.2c01405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Indexed: 06/18/2023]
Abstract
It remains intriguing whether macromolecular isomerism, along with competing molecular interactions, could be leveraged to create unconventional phase structures and generate considerable phase complexity in soft matter. Herein, we report the synthesis, assembly, and phase behaviors of a series of precisely defined regioisomeric Janus nanograins with distinct core symmetry. They are named B2DB2 where B stands for iso-butyl-functionalized polyhedral oligomeric silsesquioxanes (POSS) and D stands for dihydroxyl-functionalized POSS. While BPOSS prefers crystallization with a flat interface, DPOSS prefers to phase-separate from BPOSS. In solution, they form 2D crystals owing to strong BPOSS crystallization. In bulk, the subtle competition between crystallization and phase separation is strongly influenced by the core symmetry, leading to distinct phase structures and transition behaviors. The phase complexity was understood based on their symmetry, molecular packing, and free energy profiles. The results demonstrate that regioisomerism could indeed generate profound phase complexity.
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Affiliation(s)
- Yu Shao
- Beijing
National Laboratory for Molecular Sciences, Key Laboratory of Polymer
Chemistry & Physics of Ministry of Education, College of Chemistry
and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Di Han
- College
of Polymer Science & Engineering, State Key Laboratory of Polymer
Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Yangdan Tao
- College
of Polymer Science & Engineering, State Key Laboratory of Polymer
Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Fengfeng Feng
- Center
for Advanced Low-Dimension Materials, State Key Laboratory for Modification
of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
| | - Ge Han
- College
of Polymer Science & Engineering, State Key Laboratory of Polymer
Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Bo Hou
- Beijing
National Laboratory for Molecular Sciences, Key Laboratory of Polymer
Chemistry & Physics of Ministry of Education, College of Chemistry
and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Hao Liu
- Center
for Advanced Low-Dimension Materials, State Key Laboratory for Modification
of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
| | - Shuguang Yang
- Center
for Advanced Low-Dimension Materials, State Key Laboratory for Modification
of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
| | - Qiang Fu
- College
of Polymer Science & Engineering, State Key Laboratory of Polymer
Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Wen-Bin Zhang
- Beijing
National Laboratory for Molecular Sciences, Key Laboratory of Polymer
Chemistry & Physics of Ministry of Education, College of Chemistry
and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
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The Role of Branch Cell Symmetry and Other Critical Nanoscale Design Parameters in the Determination of Dendrimer Encapsulation Properties. Biomolecules 2020; 10:biom10040642. [PMID: 32326311 PMCID: PMC7226492 DOI: 10.3390/biom10040642] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 02/27/2020] [Accepted: 03/21/2020] [Indexed: 12/23/2022] Open
Abstract
This article reviews progress over the past three decades related to the role of dendrimer-based, branch cell symmetry in the development of advanced drug delivery systems, aqueous based compatibilizers/solubilizers/excipients and nano-metal cluster catalysts. Historically, it begins with early unreported work by the Tomalia Group (i.e., The Dow Chemical Co.) revealing that all known dendrimer family types may be divided into two major symmetry categories; namely: Category I: symmetrical branch cell dendrimers (e.g., Tomalia, Vögtle, Newkome-type dendrimers) possessing interior hollowness/porosity and Category II: asymmetrical branch cell dendrimers (e.g., Denkewalter-type) possessing no interior void space. These two branch cell symmetry features were shown to be pivotal in directing internal packing modes; thereby, differentiating key dendrimer properties such as densities, refractive indices and interior porosities. Furthermore, this discovery provided an explanation for unimolecular micelle encapsulation (UME) behavior observed exclusively for Category I, but not for Category II. This account surveys early experiments confirming the inextricable influence of dendrimer branch cell symmetry on interior packing properties, first examples of Category (I) based UME behavior, nuclear magnetic resonance (NMR) protocols for systematic encapsulation characterization, application of these principles to the solubilization of active approved drugs, engineering dendrimer critical nanoscale design parameters (CNDPs) for optimized properties and concluding with high optimism for the anticipated role of dendrimer-based solubilization principles in emerging new life science, drug delivery and nanomedical applications.
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Tomalia DA, Khanna SN. A Systematic Framework and Nanoperiodic Concept for Unifying Nanoscience: Hard/Soft Nanoelements, Superatoms, Meta-Atoms, New Emerging Properties, Periodic Property Patterns, and Predictive Mendeleev-like Nanoperiodic Tables. Chem Rev 2016; 116:2705-74. [DOI: 10.1021/acs.chemrev.5b00367] [Citation(s) in RCA: 166] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Donald A. Tomalia
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
- National Dendrimer & Nanotechnology Center, NanoSynthons LLC, 1200 North Fancher Avenue, Mt. Pleasant, Michigan 48858, United States
| | - Shiv N. Khanna
- Department
of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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