Hydrophobic Carbon Dots from Aliphatic Compounds with One Terminal Functional Group

2019 ◽  
Vol 123 (36) ◽  
pp. 22447-22456 ◽  
Author(s):  
Keyang Yin ◽  
Dandan Lu ◽  
Liping Wang ◽  
Quanxin Zhang ◽  
Junying Hao ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Functional Group ◽  
Aliphatic Compounds ◽  
Terminal Functional Group

scholarly journals Silica-Polystyrene Nanocomposite Particles Synthesized by Nitroxide-Mediated Polymerization and Their Encapsulation through Miniemulsion Polymerization

2006 ◽  
Vol 2006 ◽  
pp. 1-10 ◽  
Author(s):  
Bérangère Bailly ◽  
Anne-Carole Donnenwirth ◽  
Christèle Bartholome ◽  
Emmanuel Beyou ◽  
Elodie Bourgeat-Lami
Keyword(s):  
Silica Nanoparticles ◽  
Functional Group ◽  
Silica Surface ◽  
Miniemulsion Polymerization ◽  
Molecular Weights ◽  
Transmission Electron ◽  
Shell Particles ◽  
Terminal Functional Group ◽  
Nitroxide Mediated Polymerization

Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000g⋅mol-1and narrow polydispersities were grown from the surface of silica nanoparticles (Aerosil A200 fumed silica and Stöber silica, resp.) through nitroxide-mediated polymerization (NMP). Alkoxyamine initiators based on N-tert-butyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide (DEPN) and carrying a terminal functional group have been synthesized in situ and grafted to the silica surface. The resulting grafted alkoxyamines have been employed to initiate the growth of polystyrene chains from the inorganic surface. The maximum grafting density of the surface-tethered PS chains was estimated and seemed to be limited by initiator confinement at the interface. Then, the PS-grafted Stöber silica nanoparticles were entrapped inside latex particles via miniemulsion polymerization. Transmission electron microscopy indicated the successful formation of silica-polystyrene core-shell particles.

scholarly journals Influence of the nature of the alkanethiol terminal group on the electrochemical stability and blocking ability of self-assembled nanofilms on Au electrode

2021 ◽  
Vol 340 ◽  
pp. 01013
Author(s):  
Svetlana Ovchinnikova ◽  
Tatyana Aleksandrova
Keyword(s):  
Functional Group ◽  
Energy State ◽  
Terminal Group ◽  
Electrochemical Stability ◽  
Self Assembled Monolayers ◽  
Oh Groups ◽  
End Groups ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Terminal Functional Group

We studied the effect of the nature of the terminal group of thiols with the same chain length HS (CH2)8 – R (R: -CH3, -CH2OH, -NH2) on the electrodesorption behaviour of well-formed SAMs (the self-assembled monolayers), their stability and blocking ability using voltammetry and chronoamperometry. The nature of the terminal functional group determines the surface properties of SAM and provides the basis for subsequent interactions (for example, with peptides, proteins, DNA) in order to create sensors and bioagents. For the studied thiols, the hydrophilicity of the end groups increases in the series -CH3<< -NH2 ≤ -CH2OH; they also differ in polarity and the possibility of protonation of the amino group. For thiols with -CH3 and -CH2OH groups, an increase in the hydrophilicity of the terminal group leads to the formation of less stable and less ordered films. The replacement of carbon by nitrogen with approximately the same hydrophilicity of the groups (-CH2OH and -NH2) leads to the formation of a more stable film consisting of molecules in the same energy state, butwith poorer insulatingproperties.

Green synthesis of Zingiberis rhizoma-based carbon dots attenuates chemical and thermal stimulus pain in mice

Nanomedicine ◽  
2020 ◽  
Vol 15 (9) ◽  
pp. 851-869
Author(s):  
Meiling Zhang ◽  
Jinjun Cheng ◽  
Yue Zhang ◽  
Hui Kong ◽  
Suna Wang ◽  
...  
Keyword(s):  
Analgesic Activity ◽  
Carbon Dots ◽  
Functional Group ◽  
Biomedical Application ◽  
Chemical Stimulus ◽  
Thermal Stimulus ◽  
Hot Plate ◽  
Pyrolysis Method ◽  
Tail Immersion ◽  
Preliminary Study

Aim: To evaluate the analgesic activity of Zingiberis rhizoma-based carbon dots (ZR-CDs). Materials & methods: Novel ZR-CDs were prepared via a facile, green pyrolysis method. Microstructure, optical and functional group properties were characterized. Acetic acid writhing, hot-plate and tail-immersion tests were performed using mice to evaluate the analgesic activity of ZR-CDs, followed by a preliminary study on the analgesic mechanism. Results: ZR-CDs with a quantum yield of 5.2% had a diameter ranging from 2.23 to 3.77 nm. Remarkable analgesic effect of ZR-CDs was observed against both thermal and chemical stimulus tests, possibly mediated by an opioid-like mechanism and the regulation of 5-hydroxytryptamine levels. Conclusion: ZR-CDs have a promising potential for biomedical application in relieving pain-related diseases.

scholarly journals Effects of terminal group and chain length on temperature-responsive chromatography utilizing poly(N-isopropylacrylamide) synthesized via RAFT polymerization

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73217-73224 ◽  
Author(s):  
Yuki Hiruta ◽  
Yuhei Nagumo ◽  
Atsushi Miki ◽  
Teruo Okano ◽  
Hideko Kanazawa
Keyword(s):  
Chain Length ◽  
Functional Group ◽  
Raft Polymerization ◽  
Stationary Phases ◽  
Terminal Group ◽  
Temperature Dependent ◽  
Temperature Responsive ◽  
Silica Beads ◽  
Elution Behavior ◽  
Terminal Functional Group

Even using the same homo poly(N-isopropylacrylamide) immobilized silica beads as stationary phases, terminal functional group and chain length significantly affected temperature-dependent elution behavior of steroids.

Effect of terminal functional group size on ferroelectric and antiferroelectric properties of liquid crystals

2005 ◽  
Vol 32 (11-12) ◽  
pp. 1483-1498 ◽  
Author(s):  
Stephen J. Cowling ◽  
Alan W. Hall ◽  
John W. Goodby
Keyword(s):  
Liquid Crystals ◽  
Group Size ◽  
Functional Group ◽  
Terminal Functional Group

Coding of odor molecules by mitral/tufted cells in rabbit olfactory bulb. I. Aliphatic compounds

1992 ◽  
Vol 68 (6) ◽  
pp. 1986-2002 ◽  
Author(s):  
K. Imamura ◽  
N. Mataga ◽  
K. Mori
Keyword(s):  
Fatty Acids ◽  
Olfactory Bulb ◽  
Functional Group ◽  
Hydrocarbon Chain ◽  
Main Olfactory Bulb ◽  
Aliphatic Aldehydes ◽  
Aliphatic Compounds ◽  
Hydrocarbon Chains ◽  
Tufted Cells ◽  
Chain Lengths

1. Recordings of extracellular spike responses were made from single mitral/tufted cells in the main olfactory bulb of urethan-anesthetized rabbits. Olfactory epithelium ipsilateral to the recorded olfactory bulb was stimulated with homologous series of aliphatic compounds using periodic artificial inhalations. 2. In the dorsomedial part of the main olfactory bulb, single mitral/tufted cells were activated by subsets of n-fatty acids with similar hydrocarbon chain lengths. Response selectivities of single mitral/tufted cells were examined in detail using a series of n-fatty acids at five different concentrations. The results indicate that although the range of effective fatty acids is broader at the higher concentrations, the best response at higher concentrations was similar to that determined at lower concentrations. 3. Analysis of single-unit responses to the panel of fatty acids, including those with branched hydrocarbon chains, suggested that the determinants for the response specificities of individual mitral/tufted cells in the dorsomedial region include the overall size of hydrocarbon chains of the odor ligand molecules. 4. Single mitral/tufted cells in the dorsomedial region tended to be activated not only by fatty acids but also by n-aliphatic aldehydes. For a panel of a homologous series of n-aldehydes at five different concentrations, individual mitral/tufted cells showed response selectivity to subsets of aldehydes with similar hydrocarbon chain lengths. 5. In most cases, normal aliphatic alcohols and alkanes were ineffective in activating mitral/tufted cells in the dorsomedial region. This suggests that carbonyl group (--C = O) in the odor molecules plays an important role in determining response specificity of these neurons. 6. Examination with an expanded panel of stimulus odor molecules that included ketones and esters indicated that single mitral/tufted cells sensitive to subsets of fatty acids and n-aliphatic aldehydes were also responsive to subsets of ketones and/or esters having hydrocarbon chain lengths similar to those of the effective fatty acids and aldehydes. 7. The present results show a clear correlation between the tuning specificity of individual mitral/tufted cells and the stereochemical structure of the odor molecules, with respect to 1) length and/or structure of hydrocarbon chain, 2) difference in functional group, and 3) position of the functional group within the molecule. 8. A hypothetical diagram suggesting functional convergence of olfactory nerve input to individual glomeruli is proposed to explain the mechanism for selective activation of individual mitral/tufted cells by a range of odor molecules with similar stereochemical structures.

scholarly journals Preparation of Three-Armed Star Polystyrene by Reaction of Prepolymer Having a Terminal Functional Group with Triisocyanate

1987 ◽  
Vol 19 (9) ◽  
pp. 1013-1023 ◽  
Author(s):  
Toshiaki Kitano ◽  
Takashi Yamamoto ◽  
Yasuo Okemoto ◽  
Shinichi Itsuno ◽  
Koichi Ito
Keyword(s):  
Functional Group ◽  
Terminal Functional Group
Sign in / Sign up

Export Citation Format

Share Document