Results 81 to 90 of about 296,130 (365)

Trends in pKa Values for polyprotic carboxylic acids [PDF]

arXiv, 2020
In this work we have reported the pKa values for straight chain (without branches) oligomers of Acrylic acid using CBS-QB3 gas phase energies with solvation free energies from CPCM/HF 6-31G(d) and SMD/B3LYP (2df,p). We have found that the negative log of the first acid dissociation constant decreases with the chain length.
arxiv  

A study of aliphatic amino acids using simulated vibrational circular dichroism and Raman optical activity spectra [PDF]

, 2013
Vibrational optical activity (VOA) spectra, such as vibrational circular dichroism (VCD) and Raman optical activity (ROA) spectra, of aliphatic amino acids are simulated using density functional theory (DFT) methods in both gas phase (neutral form) and solution (zwitterionic form), together with their respective infrared (IR) and Raman spectra of the ...
arxiv   +1 more source

PEG Branched Polymer for Functionalization of Nanomaterials with Ultralong Blood Circulation [PDF]

Journal of the American Chemical Society Article ASAP 2009 - 10.1021/ja809086q, 2009
Nanomaterials have been actively pursued for biological and medical applications in recent years. Here, we report the synthesis of several new poly(ethylene glycol) grafted branched-polymers for functionalization of various nanomaterials including carbon nanotubes, gold nanoparticles (NP) and gold nanorods (NRs), affording high aqueous solubility and ...
arxiv   +1 more source

The synthesis, transformations and biological activity of thieno[2,3-d]pyrimidine derivatives with the carboxylic groups as the substituents in the pyrimidine ring

Журнал органічної та фармацевтичної хімії, 2020
Aim. To reveal the prospects of the search of novel medicinal substances based on the studies of the derivatives of thieno[2,3-d]pyrimidine with the carboxylic groups as the substituents in the pyrimidine ring using the analysis of the published ...
O. D. Vlasova, S. V. Vlasov, V. I. Kabachnyy, V. S. Vlasov   +3 more
doaj   +1 more source

The intermolecular hydro-oxycarbonylation of internal alkynes: current state of the art [PDF]

, 2018
The authors acknowledge the Spanish MINECO (projects CTQ2013-40591-P and CTQ2016-75986-P) and the Gobierno del Principado de Asturias (project GRUPIN14-006) for financial support. J. F.
Cadierno Menéndez, Victorio, Francos Arias, Javier, García Garrido, Sergio Emilio, González Liste, Pedro José   +3 more
core   +2 more sources

Development of a Novel Processing Route for Dispersoid/Precipitation‐Strengthened High Conductive Copper Alloys by Using Metalized Nanoceramics in Additive Manufacturing

Advanced Engineering Materials, EarlyView.
This study explores a process chain to produce dispersoid‐strengthened CuCr1Zr for applications requiring high strength and conductivity. Using gas‐atomized powder and copper‐plated alumina nanoparticles, additive manufacturing is performed via powder bed based additive manufacturing with green and red lasers, followed by heat treatment.
Heinrich von Lintel, Abdelrahman Elsayed, Lukas Mielewczyk, Katja Eichmann, Julia Grothe, Ulrich Krupp, Avinash Hariharan, Katrin Jahns   +7 more
wiley   +1 more source

Improved Mechanical Performance of Epoxy Systems with Low Loadings of Milled Carbon Fiber via Chemical Surface Modification

Advanced Engineering Materials, Volume 27, Issue 9, May 2025.
The authors explore thermally initiated diazonium chemical surface modification as a means of improving the mechanical performance of milled carbon fibers in epoxy matrix systems at varying loadings by weight. They report significant improvements at <1% w/w loading through examination of flexural and tensile strength and modulus.
Ben Newman, Filip Stojcevski, Karyn L. Jarvis, Piers Coia, Luke C. Henderson   +4 more
wiley   +1 more source

Comparison of Three Solid Phase Materials for the Extraction of Carboxylic Acids from River Water Followed by 2D GC × GC-TOFMS Determination

International Journal of Analytical Chemistry, 2016
The extraction and determination of aliphatic and aromatic carboxylic acids as well as their influence on the aromaticity and molecularity relationship of natural organic matter (NOM) in water are reported in this study. Three solid phase extraction (SPE)
G. O. Bosire, J. C. Ngila, H. Parshotam
doaj   +1 more source

Efficient and convenient synthesis of symmetrical carboxylic anhydrides from carboxylic acids with sulfated zirconia by phase transfer catalysis [PDF]

, 2011
An efficient and convenient procedure for the synthesis of symmetrical carboxylic anhydrides from carboxylic acids with sulfated zirconia by PEG-1000 phase transfer catalysis has been developed.
E Zhao, Xing, Lin Hu, Yu, Lu, Ming
core   +3 more sources

Enhanced Mechanical Properties of Injectable Chitosan–Guar Gum Hydrogel Reinforced with Bacterial Cellulose Nanofibers for Tissue Engineering Applications

Advanced Engineering Materials, EarlyView.
This study presents the development and characterization of injectable nanocomposite hydrogels based on N‐succinyl chitosan, oxidized guar gum, and bacterial cellulose nanofibers. Emphasizing enhanced mechanical properties and biocompatibility, the hydrogels exhibit fast gelation, improved structural integrity, and reduced swelling. Their potential for
Raimundo Nonato Fernandes Moreira Filho, Pascale Chevallier, Silvia Rodriguez Fernandez, Maud Viallon, Matheus Xavier de Oliveira, Ana Lorena de Brito Soares, Diego Mantovani, Judith Pessoa de Andrade Feitosa, Rodrigo Silveira Vieira   +8 more
wiley   +1 more source