Isopiestic Measurements of Water Activities for an Arsenic Acid Aqueous Solution at 298.15 K

2017 ◽  
Vol 62 (10) ◽  
pp. 3306-3312
Author(s):  
Haitang Yang ◽  
Qingwei Wang ◽  
Quanbao Zhou ◽  
Jianling Yue
Keyword(s):  
Aqueous Solution ◽  
Arsenic Acid ◽  
Isopiestic Measurements ◽  
Acid Aqueous Solution

scholarly journals Double-Cross-Linked Networks Based on Methacryloyl Mucin

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1706
Author(s):  
Elena Olăreț ◽  
Brîndușa Bălănucă ◽  
Andra Mihaela Onaș ◽  
Jana Ghițman ◽  
Horia Iovu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Chemical Modification ◽  
Structural Modification ◽  
Aqueous Media ◽  
Cross Linking ◽  
Ph Values ◽  
Acid Aqueous Solution ◽  
Reaction Media ◽  
Double Cross

Mucin is a glycoprotein with proven potential in the biomaterials field, but its use is still underexploited for such applications. The present work aims to produce a synthesis of methacryloyl mucin single-network (SN) hydrogels and their double-cross-linked-network (DCN) counterparts. Following the synthesis of the mucin methacryloyl derivative, various SN hydrogels are prepared through the photopolymerization of methacrylate bonds, using reaction media with different pH values. The SN hydrogels are converted into DCN systems via supplementary cross-linking in tannic acid aqueous solution. The chemical modification of mucin is described, and the obtained product is characterized; the structural modification of mucin is assessed through FTIR spectroscopy, and the circular dichroism and the isoelectric point of methacryloyl mucin is evaluated. The affinity for aqueous media of both SN and DCN hydrogels is estimated, and the mechanical properties of the systems are assessed, both at macroscale through uniaxial compression and rheology tests and also at microscale through nanoindentation tests.

scholarly journals Crystal structure of sodium dihydrogen arsenate

2017 ◽  
Vol 73 (10) ◽  
pp. 1520-1522 ◽  
Author(s):  
Joseph Ring ◽  
Lorenz Lindenthal ◽  
Matthias Weil ◽  
Berthold Stöger
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Asymmetric Unit ◽  
Arsenic Acid ◽  
Distorted Octahedral Coordination ◽  
Sodium Cations ◽  
Distorted Octahedral ◽  
Coordination Spheres ◽  
Partial Neutralization ◽  
Sodium Dihydrogen

Single crystals of the title compound, Na(H2AsO4), were obtained by partial neutralization of arsenic acid with sodium hydroxide in aqueous solution. The crystal structure of Na(H2AsO4) is isotypic with the phosphate analogue and the asymmetric unit consists of two sodium cations and two tetrahedral H2AsO4−anions. Each of the sodium cations is surrounded by six O atoms of five H2AsO4−groups, defining distorted octahedral coordination spheres. In the extended structure, the sodium cations and dihydrogen arsenate anions are arranged in the form of layers lying parallel to (010). Strong hydrogen bonds [range of O...O distances 2.500 (3)–2.643 (3) Å] between adjacent H2AsO4−anions are observed within and perpendicular to the layers. The isotypic structure of Na(H2PO4) is comparatively discussed.

A self-healing and multi-responsive hydrogel based on biodegradable ferrocene-modified chitosan

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55133-55138 ◽  
Author(s):  
Ya-Kun Li ◽  
Cheng-Gong Guo ◽  
Liang Wang ◽  
Youqian Xu ◽  
Chen-yang Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
The Self ◽  
Self Healing ◽  
Modified Chitosan ◽  
Acid Aqueous Solution ◽  
External Stimuli

Here, we present a novel and facile method for constructing a self-healing hydrogel with multi-responses to external stimuli via the self-assemble of biodegradable ferrocene-modified chitosan (FcCS) in an acid aqueous solution.

Optical studies of stability and aggregation state of porphyrins in acid aqueous solution

2005 ◽  
Vol 45 (3) ◽  
pp. 175-181
Author(s):  
Irena Šimkienė ◽  
Algirdas Kindurys ◽  
Jurgis Gintautas Babonas ◽  
Valentinas Snitka ◽  
Raminta Rodaitė-Riševičienė ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Optical Studies ◽  
Aggregation State ◽  
Acid Aqueous Solution
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