Melamine as an Effective Supramolecular Modifier and Stabilizer in a Nanotube‐Constituted Supergel

Xing, Peng; Chu, Xiaoxiao; Ma, Mingfang; Li, Shangyang; Hao, Aiyou

doi:10.1002/asia.201402645

Cited by 32 publications

(40 citation statements)

References 95 publications

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“…7 indicating the presence of inter-carboxylic acid hydrogen bonding. [31][32][33] In contrast to that, the free C=O stretching vibration peak appeared at 1690 cm -1 is comparatively small. In addition, peaks located at 1630 cm -1 as well as 1543 cm -1 are contributed by the amide I and amide II bands, confirming the existence of amide-amide hydrogen bonding.…”

Section: Resultscontrasting

confidence: 58%

Selective Metal-Ion-Mediated Vesicle Adhesion Based on Dynamic Self-Organization of a Pyrene-Appended Glutamic Acid

Xing

Wang

Yang

et al. 2016

ACS Appl. Mater. Interfaces

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Vesicles with dynamic membranes provide an ideal model system for investigating biological membrane activities, whereby vesicle aggregation behaviors including adhesion, fusion, fission, and membrane contraction/extension have attracted much attention. In this work we utilize an aromatic amino acid (pyrene-appended glutamic acid, PGlu) to prepare nanovesicles that aggregate to form vesicle clusters selectively induced by Fe(3+) or Cu(2+), and the vesicles transform into irregular nano-objects when interacting with Al(3+). Vesicle clusters have better stability than pristine vesicles, which hinders the spontaneous morphological transformation from vesicles into lamellar nanosheets with long incubation period. The difference between complexation of Fe(3+) and Al(3+) with vesicles was studied by various techniques. On the basis of metal ion-vesicle interactions, this self-assembled nanovesicle system also behaves as an effective fluorescent sensor for Fe(3+) and Al(3+), which cause fluorescence quenching and enhanced excimer emission, respectively.

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Section: Resultscontrasting

confidence: 58%

Selective Metal-Ion-Mediated Vesicle Adhesion Based on Dynamic Self-Organization of a Pyrene-Appended Glutamic Acid

Xing

Wang

Yang

et al. 2016

ACS Appl. Mater. Interfaces

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“…The slight shifts may be derived from the alternation of particle sizes and the tiny change of UV/Vis absorbance. Upon increasing molar ratio of Mm, it was found that the Cotton effects were inversed only after adding 2 equivalent or more Mm (Figure S7 in the Supporting Information), indicating that two carboxylic acids of glutamic acid moiety must be occupied to trigger the helicity inversion . This speculation was then confirmed by the TEM studies (Figure S8 in the Supporting Information), showing that, when the ratio of Mm was lower than 2 equivalents, only belts without apparent chirality were formed, while the twisted topology appeared after adding more than 2 equivalents of Mm.…”

Section: Resultsmentioning

confidence: 99%

Self‐Assembly of Organic Building Blocks with Directly Exfoliated Graphene to Fabricate Di‐ and Tricomponent Hybrids

et al. 2015

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In this work, we developed a strategy to fabricate self‐assembled aggregates encapsulating graphene from direct exfoliation of graphite. Naphthalene‐anhydride‐appended glutamic acid (NG) and pyrene‐appended glutamic acid (PG) were utilized to exfoliate graphite to generate few‐layer graphene in basic aqueous media. Acidification‐triggered self‐assembly of PG could encapsulate graphene sheets to give graphene@microsheet hybrids. Melamine (Mm) was introduced to induce the morphological transformation of PG from microsheets to twisted fibers with columnar packing. In the presence of graphene, this transformation allowed the fabrication of twisted‐fiber‐encapsulated graphene (graphene@twist fiber). Tricomponent hybrids were also built up via in situ preparation of gold nanoparticles (AuNPs) on the negatively charged surface of few‐layer graphene during the self‐assembly process. This study presents an approach to construct directly exfoliated graphene‐based hybrids through self‐assembly.

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“…In spite of these developments, the effect of amino acid type or α‐substituent structure on multicomponent self‐assembly is still poorly understood. Unlike strong binding interaction between amino acids and other components, relatively weak binding could be significantly influenced by self‐sorting competition, which might result in a selectivity in various types of amino acid residues upon the coassembly with a weak binder. Thus, a better understanding of the effect is of vital importance in designing amino acid/short peptide‐based multicomponent materials with desired functions.…”

Section: Methodsmentioning

confidence: 99%

“…Clearly, the complexation with bipyridine enhances the growth of Gly backbone in 3D scale rather than 1D. [27b] The self‐assembly between Gly and BP was also studied by small and wide angle X‐ray scattering (SAXS and WAXS) techniques as shown in Figure d. The pristine Gly assembly in water showed the first‐order peak at 0.33 Å −1 ( d = 1.9 nm), which gradually disappeared when 0.5 molar equivalent BP was added, in a good agreement with the molar ratio of 2:1 revealed by single crystal analysis.…”

Section: Methodsmentioning

confidence: 99%

Selective Coassembly of Aromatic Amino Acids to Fabricate Hydrogels with Light Irradiation‐Induced Emission for Fluorescent Imprint

et al. 2017

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Controlling the structural parameters in coassembly is crucial for the fabrication of multicomponent functional materials. Here a proof-of-concept study is presented to reveal the α-substituent effect of aromatic amino acids on their selective coassembly with bipyridine binders. With the assistance of X-ray scattering technique, it is found that individual packing in the solid state as well as bulky effect brought by α-substitution determines the occurrence of coassembly. A well-performed hydrogels based on the complexation between certain aromatic amino acids and bipyridine units are successfully constructed, providing unprecedented smart materials with light irradiation-triggered luminescence. Such hydrogels without the phase separation and photobleaching during light irradiation are able to behave fluorescent imprint materials. This study provides a suitable protocol in rationally designing amino acid residues of short peptides for fabricating self-assembled multicomponent materials. In addition, this protocol is useful in screening potential functional materials on account of diverse self-assembly behavior.

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Melamine as an Effective Supramolecular Modifier and Stabilizer in a Nanotube‐Constituted Supergel

Cited by 32 publications

References 95 publications

Selective Metal-Ion-Mediated Vesicle Adhesion Based on Dynamic Self-Organization of a Pyrene-Appended Glutamic Acid

Selective Metal-Ion-Mediated Vesicle Adhesion Based on Dynamic Self-Organization of a Pyrene-Appended Glutamic Acid

Self‐Assembly of Organic Building Blocks with Directly Exfoliated Graphene to Fabricate Di‐ and Tricomponent Hybrids

Selective Coassembly of Aromatic Amino Acids to Fabricate Hydrogels with Light Irradiation‐Induced Emission for Fluorescent Imprint

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