scholarly journals Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids

Soft Matter ◽  
2015 ◽  
Vol 11 (18) ◽  
pp. 3550-3558 ◽  
Author(s):  
Yoshiyuki Kageyama ◽  
Tomonori Ikegami ◽  
Natsuko Hiramatsu ◽  
Sadamu Takeda ◽  
Tadashi Sugawara
Keyword(s):  
Carboxylic Acids ◽  
Self Assembly ◽  
Growth Behavior ◽  
Aliphatic Acids ◽  
Continuous Formation ◽  
Medium Length

Medium-length aliphatic acids promote the continuous formation of helical self-assembly of oleate.

The Activation of Carboxylic Acids via Self-Assembly Asymmetric Organocatalysis: A Combined Experimental and Computational Investigation

2016 ◽  
Vol 138 (44) ◽  
pp. 14740-14749 ◽  
Author(s):  
Mattia Riccardo Monaco ◽  
Daniele Fazzi ◽  
Nobuya Tsuji ◽  
Markus Leutzsch ◽  
Saihu Liao ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Self Assembly ◽  
Computational Investigation ◽  
Asymmetric Organocatalysis

In situ tetrafluoroborate-modified MAPbBr3 nanocrystals showing high photoluminescence, stability and self-assembly behavior

2020 ◽  
Vol 8 (6) ◽  
pp. 1989-1997
Author(s):  
Xiao Yang ◽  
Fan Li ◽  
Xiaofeng Wang ◽  
Yifei Xu ◽  
Haoliang Wei ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Self Assembly ◽  
Growth Behavior ◽  
Good Stability ◽  
Assembly Behavior ◽  
Crystal Growth Behavior

An in situ tetrafluoroborate modification protocol is developed to prepare CH3NH3PbBr3 nanocrystals with high photoluminescence, good stability, and self-assembly crystal growth behavior.

scholarly journals Manganese-mediated reductive functionalization of activated aliphatic acids and primary amines

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhan Li ◽  
Ke-Feng Wang ◽  
Xin Zhao ◽  
Huihui Ti ◽  
Xu-Ge Liu ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Late Stage ◽  
Materials Science ◽  
Reaction Pathway ◽  
Chemical Conversion ◽  
Primary Amines ◽  
Mechanistic Studies ◽  
Reaction Conditions ◽  
Aliphatic Acids ◽  
Redox Active

Abstract Alkyl carboxylic acids as well as primary amines are ubiquitous in all facets of biological science, pharmaceutical science, chemical science and materials science. By chemical conversion to redox-active esters (RAE) and Katritzky’s N-alkylpyridinium salts, respectively, alkyl carboxylic acids and primary amines serve as ideal starting materials to forge new connections. In this work, a Mn-mediated reductive decarboxylative/deaminative functionalization of activated aliphatic acids and primary amines is disclosed. A series of C-X (X = S, Se, Te, H, P) and C-C bonds are efficiently constructed under simple and mild reaction conditions. The protocol is applicable to the late-stage modification of some structurally complex natural products or drugs. Preliminary mechanistic studies suggest the involvement of radicals in the reaction pathway.

scholarly journals An enhanced procedure for measuring organic acids and methyl esters in PM<sub>2.5</sub>

2015 ◽  
Vol 8 (3) ◽  
pp. 2379-2407
Author(s):  
F. Liu ◽  
F. Duan ◽  
K. He ◽  
Y. Ma ◽  
K. A. Rahn ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Acids ◽  
Carboxylic Acids ◽  
Solid Phase ◽  
Methyl Esters ◽  
Aromatic Acids ◽  
Naphthalic Anhydride ◽  
Aliphatic Acids ◽  
Specificity And Sensitivity

Abstract. We have developed an enhanced analytical procedure to measure organic acids and methyl esters in fine aerosol with much greater specificity and sensitivity than previously available. This capability is important because of these species and their low concentrations, even in highly polluted atmospheres like Beijing, China. The procedure first separates the acids and esters from the other organic compounds with anion-exchange solid- phase extraction (SPE), then, quantifies them by gas chromatography coupled with mass spectrometry. This allows us to accurately quantify the C4-C11 dicarboxylic and the C8-C30 monocarboxylic acids. Then the acids are separated from the esters on an aminopropyl SPE cartridge, whose weak retention isolates and enriches the acids from esters prevents the fatty acids and dimethyl phthalate from being overestimated. The resulting correlations between the aliphatic acids and fatty acid methyl esters (FAMEs) suggest that FAMEs had sources similar to those of the carboxylic acids, or were formed by esterifying carboxylic acids, or that aliphatic acids were formed by hydrolyzing FAMEs. In all, 17 aromatic acids were identified and quantified using this procedure coupled with gas chromatography-tandem mass spectrometry, including the five polycyclic aromatic hydrocarbon (PAH) acids 2-naphthoic, biphenyl-4-carboxylic, 9-oxo-9H-fluorene-1-carboxylic, biphenyl-4,4´-dicarboxylic, and phenanthrene-1-carboxylic acid, plus 1,8-naphthalic anhydride. Correlations between the PAH-acids and the dicarboxylic and aromatic acids indicated that the first three acids and 1,8-naphthalic anhydride were mainly secondary, the last two mainly primary.

EFFECT OF NICKEL CONTENTS ON THE MICROSTRUCTURE OF MESOPOROUS NICKEL OXIDE/GADOLINIUM-DOPED CERIA

2013 ◽  
Vol 06 (06) ◽  
pp. 1350055 ◽  
Author(s):  
SEUNGHYUN AHN ◽  
HYUN KOO ◽  
SUNG-HWAN BAE ◽  
CHAN PARK ◽  
GUYOUNG CHO ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Self Assembly ◽  
Specific Area ◽  
Mesoporous Structure ◽  
Growth Behavior ◽  
Solid Oxide ◽  
Nano Particles ◽  
Pluronic F127 ◽  
Doped Ceria ◽  
Structure Directing Agent

The effect of NiO contents on the microstructure of mesoporous NiO - Gd 0.25 Ce 0.75 O 2-x ( NiO -GDC) composite for intermediate temperature solid oxide fuel cells (IT-SOFC) was investigated. Mesoporous NiO -GDC powders with different NiO contents were synthesized by self-assembly hydrothermal method using tri-block copolymer, Pluronic F127, as a structure directing agent. Grain growth/agglomeration behaviors of NiO particles and changes of mesoporous structure of GDC particles were characterized by microstructural analyses. NiO -GDC powders were composed of GDC nano particles with ordered mesopore inside the particles and octahedral NiO grains with truncated-edges. As the amount of NiO increases, specific area value of mesoporous NiO -GDC was decreased, and the agglomeration/growth behavior of NiO grains was accelerated.

Aliphatic carboxylic acids in buried Ah horizons in Alberta, Canada as paleoenvironmental indicators

1983 ◽  
Vol 20 (5) ◽  
pp. 859-866 ◽  
Author(s):  
J. F. Dormaar
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carboxylic Acids ◽  
Soil Formation ◽  
Aliphatic Acids ◽  
Southern Alberta ◽  
Aliphatic Carboxylic Acids ◽  
Paleoenvironmental Indicators

In southern Alberta, a buried Ah horizon is frequently present beneath Mazama tephra (ca. 6600 years BP). Drainage conditions during the formation of such buried Ah horizons may determine the quality of the aliphatic carboxylic acids in the soil organic matter. The spectrum of aliphatic acids extracted from a number of buried Ah horizons indeed suggests either well drained or poorly drained conditions during soil formation regardless of the mode of deposition of materials before or after the soil-forming interval. The climate required for development of the well drained paleosols was inferred to be similar to the climate under which surficial Black Chernozemic Ah horizons were formed.

The Role of Hydroxyl Groups in the Self-Assembly of Long Chain Alkylhydroxyl Carboxylic Acids on Mica

2008 ◽  
Vol 112 (43) ◽  
pp. 16968-16972 ◽  
Author(s):  
José J. Benítez ◽  
José A. Heredia-Guerrero ◽  
Francisco M. Serrano ◽  
Antonio Heredia
Keyword(s):  
Carboxylic Acids ◽  
Self Assembly ◽  
The Self ◽  
Hydroxyl Groups ◽  
Long Chain
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