scholarly journals Correction: Di-amidosils with tunable structure, morphology and emission quantum yield: the role of hydrogen bonding

2015 ◽  
Vol 3 (31) ◽  
pp. 8272-8272 ◽  
Author(s):  
S. C. Nunes ◽  
J. Hümmer ◽  
V. T. Freitas ◽  
R. A. S. Ferreira ◽  
L. D. Carlos ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Quantum Yield ◽  
Structure Morphology ◽  
Tunable Structure ◽  
Emission Quantum Yield

Correction for ‘Di-amidosils with tunable structure, morphology and emission quantum yield: the role of hydrogen bonding’ by S. C. Nunes et al., J. Mater. Chem. C, 2015, 3, 6844–6861.

Di-amidosils with tunable structure, morphology and emission quantum yield: the role of hydrogen bonding

2015 ◽  
Vol 3 (26) ◽  
pp. 6844-6861 ◽  
Author(s):  
S. C. Nunes ◽  
J. Hümmer ◽  
V. T. Freitas ◽  
R. A. S. Ferreira ◽  
L. D. Carlos ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Variable Structure ◽  
Photoluminescence Properties ◽  
Experimental Conditions ◽  
Yield Value ◽  
Structure Morphology ◽  
Tunable Structure ◽  
Degree Of Order ◽  
Emission Quantum Yield

Di-amidosil hybrids with variable structure, morphology and photoluminescence properties were obtained using different experimental conditions. A correlation between the emission quantum yield value and the degree of order of the amide–amide hydrogen-bonded array was established for mono- and di-amidosils.

Solvatochromic effects in absorption and luminescence spectra and stability of emission quantum yield of carbon nanoparticles (part I)

2021 ◽  
Vol 7 ◽  
pp. 5-24
Author(s):  
S. A. Kazaryan ◽  
◽  
V. N. Nevolin ◽  
S. Kh. Pilosyan ◽  
◽  
...  
Keyword(s):  
Quantum Yield ◽  
Carbon Nanoparticles ◽  
Significant Contribution ◽  
Luminescence Spectra ◽  
Specific Interactions ◽  
Fundamental Properties ◽  
Wide Range ◽  
Absorption And Luminescence Spectra ◽  
Emission Quantum Yield

The features of the solvatochromic effects of absorption (Ab) and photoluminescence (PL) spectra, as well as the quantum yield of emission (QYE) of carbon nanoparticles (CNPs) synthesized by various methods from a mixture of citric acid and nitrogen-containing precursors, in protic and aprotic solvents have been studied. It has been shown that the parameters of the spectra Ab, PL and the QYE value of particle solutions to a large extent depend on the method, conditions and modes of synthesis, the method of modification and separation of CNPs, the types and composition of precursors, and also the fundamental properties and pH of solvents. In solvents with a dielectric constant of 4.5 – 109.5, the QYE value of particles varies in a wide range from 10.8 to 100.0 %, and the PL band peak shifts from 466.4 to 536.8 nm. The presence of strong solvatochromic effects in the spectra of Ab and PL particles was shown, and the important role of the processes of protonation and deprotonation of surface groups of CNPs was established. The influence of universal and specific interactions on the spectroscopic parameters of CNPs has been investigated, and a significant contribution to the solvatochromic effects of specific interactions has been demonstrated.

scholarly journals Deciphering the Role of π-Interactions in Polyelectrolyte Complexes Using Rationally Designed Peptides

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2074
Author(s):  
Sara Tabandeh ◽  
Cristina Elisabeth Lemus ◽  
Lorraine Leon
Keyword(s):  
Hydrogen Bonding ◽  
Phase Separation ◽  
Liquid Phase ◽  
Charge Density ◽  
Secondary Structures ◽  
Liquid Phase Separation ◽  
Polyelectrolyte Complexes ◽  
Π Interactions ◽  
Liquid Liquid Phase Separation

Electrostatic interactions, and specifically π-interactions play a significant role in the liquid-liquid phase separation of proteins and formation of membraneless organelles/or biological condensates. Sequence patterning of peptides allows creating protein-like structures and controlling the chemistry and interactions of the mimetic molecules. A library of oppositely charged polypeptides was designed and synthesized to investigate the role of π-interactions on phase separation and secondary structures of polyelectrolyte complexes. Phenylalanine was chosen as the π-containing residue and was used together with lysine or glutamic acid in the design of positively or negatively charged sequences. The effect of charge density and also the substitution of fluorine on the phenylalanine ring, known to disrupt π-interactions, were investigated. Characterization analysis using MALDI-TOF mass spectroscopy, H NMR, and circular dichroism (CD) confirmed the molecular structure and chiral pattern of peptide sequences. Despite an alternating sequence of chirality previously shown to promote liquid-liquid phase separation, complexes appeared as solid precipitates, suggesting strong interactions between the sequence pairs. The secondary structures of sequence pairs showed the formation of hydrogen-bonded structures with a β-sheet signal in FTIR spectroscopy. The presence of fluorine decreased hydrogen bonding due to its inhibitory effect on π-interactions. π-interactions resulted in enhanced stability of complexes against salt, and higher critical salt concentrations for complexes with more π-containing amino acids. Furthermore, UV-vis spectroscopy showed that sequences containing π-interactions and increased charge density encapsulated a small charged molecule with π-bonds with high efficiency. These findings highlight the interplay between ionic, hydrophobic, hydrogen bonding, and π-interactions in polyelectrolyte complex formation and enhance our understanding of phase separation phenomena in protein-like structures.

The role of hydrogen bonding on tuning hard-soft segments in bio-based thermoplastic poly(ether-urethane)s

2020 ◽  
Vol 274 ◽  
pp. 122678
Author(s):  
Paulina Kasprzyk ◽  
Hynek Benes ◽  
Ricardo Keitel Donato ◽  
Janusz Datta
Keyword(s):  
Hydrogen Bonding ◽  
Soft Segments

Hollow anisotropic semiconductor nanoprisms with highly crystalline frameworks for high-efficiency photoelectrochemical water splitting

2019 ◽  
Vol 7 (14) ◽  
pp. 8061-8072 ◽  
Author(s):  
Erhuan Zhang ◽  
Jia Liu ◽  
Muwei Ji ◽  
Hongzhi Wang ◽  
Xiaodong Wan ◽  
...  
Keyword(s):  
Water Splitting ◽  
Special Interest ◽  
High Efficiency ◽  
Semiconductor Nanostructures ◽  
Photoelectrochemical Water Splitting ◽  
Anisotropic Semiconductor ◽  
Structure Morphology ◽  
Tunable Structure ◽  
Pec Water Splitting

Construction of hollow anisotropic semiconductor nanostructures that possess excellent crystallinity, flexibly tunable structure/morphology and aqueous dispersity is of special interest for photoelectrochemical (PEC) water splitting

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