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Journal articles on the topic 'Anionic and cationic ions'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Kalyuzhnaya, T. V., and D. A. Orlova. "ANALYSIS OF THE CATIONIC-ANIONIC COMPOSITION OF FEED." International Journal of Veterinary Medicine, no. 3 (October 14, 2022): 106–10. http://dx.doi.org/10.52419/issn2072-2419.2022.3.106.

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When compiling diets for productive animals, one of the indicators taken into account is the cationanion balance, which is calculated based on the content of sodium and potassium cations and sulfate and chloride anions. The cationic-anionic composition of feed is very diverse. The lack or excess of one or another cation or anion in feed can lead to disruption of metabolic processes and various diseases of non-infectious etiology.The aim of the work was to quantify and analyze the cationanion composition of feed for productive animals by capillary electrophoresis.The research was carried out in

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2

Liu, Lu, Hongyang Ma, Madani Khan, and Benjamin S. Hsiao. "Highly Efficient Cationic/Anionic Cellulose Membranes for Removal of Cr(VI) and Pb(II) Ions." Membranes 13, no. 7 (2023): 651. http://dx.doi.org/10.3390/membranes13070651.

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To achieve high throughput, low-pressure drops, and high adsorption capacity of Cr(VI) and Pb(II) in industrial wastewater treatment, cellulose membranes containing cationic and anionic groups were fabricated, respectively. In this process, cost-effective cotton fabrics were oxidized using sodium periodate, followed by quaternary ammonium or sulfonation modifications. The chemical composition, surface morphology, and thermal and mechanical properties of the cellulose membranes were investigated by ATR-FTIR, solid-state NMR, SEM, TGA, and tensile experiments. Quaternary ammonium, aldehyde, and

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3

Janashvili, N., and L. Akhalbedashvili. "NATURAL ZEOLITE CLINOPTILOLITE AS ADSORBENT FOR CLEANING WATERS FROM ARSENIC IONS." Sciences of Europe, no. 110 (February 7, 2023): 3–8. https://doi.org/10.5281/zenodo.7618214.

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The article presents the results of researches the adsorption of As (III) in cationic (As<sup>3+</sup>) and in anionic (AsO3 <sup>3-</sup> ) forms from water solutions on different adsorbents, obtained from natural zeolite Clinoptilolite (CL) of deposits of Georgia. The influence of various parameters such as effect of pH, contact time, initial arsenic concentration, temperature and sorbent dosage was studied. It was found that in the process of adsorption As<sup>3+</sup> cations on zeolites are implemented in two mechanisms: ion exchange and donor-acceptor. Sorption of As<sup>3+</sup> ions oc

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4

Dong, Yu Hua, Ya Nan Liu, and Qiong Zhou. "Comparative Studies on the Corrosion Protection Effect of Different Ions Selective Polyaniline Coatings." Advanced Materials Research 287-290 (July 2011): 2464–69. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.2464.

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Different kinds of dopants were selected to dope polyaniline by chemical oxidative polymerization in this paper. Major characteristic peaks and microstructure of the doped polyaniline were analyzed by Fourier transform infrared spectra (FTIR) and scanning electron microscope (SEM). Measurement of membrane potential indicated that polyaniline doped with protonic acid such as sulfosalicylic acid (SSA) and hydrochloric acid (HCl) had characteristic of anionic selectivity, and polyaniline doped with cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) had characteristic of cationic sele

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5

Pook, Niels-Patrick. "Supramolecular Structure of Tris(1,10-phenanthroline)zinc(II)-Cation and N,N′,N″-tris(carboxymethyl)-1,3,5-benzenetricarboxamide-Anion: Synthesis, Crystal Structure, Vibrational Spectra, and Theoretical Investigations." Crystals 13, no. 4 (2023): 569. http://dx.doi.org/10.3390/cryst13040569.

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The present work reports on the synthesis, structural, spectroscopic, and theoretical studies of a new solid state ionic compound mainly composed of tris(1,10-phenanthroline)zinc(II) cations and N,N′,N″-tris(carboxymethyl)-1,3,5-benzenetricarboxamide anions. Colorless and well-shaped crystals were obtained from an alkaline aqueous methanolic solution, and single-crystal X-ray diffraction revealed a distinct supramolecular network. Powder diffraction techniques and Rietveld analysis confirmed the phase purity of the crystalline probes. The compound crystallizes in the orthorhombic space group P

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6

Chan, Kayee, Kohki Morikawa, Nobuyuki Shibata, and Anatoly Zinchenko. "Adsorptive Removal of Heavy Metal Ions, Organic Dyes, and Pharmaceuticals by DNA–Chitosan Hydrogels." Gels 7, no. 3 (2021): 112. http://dx.doi.org/10.3390/gels7030112.

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DNA–chitosan (DNA–CS) hydrogel was prepared by in situ complexation between oppositely charged DNA and chitosan polyelectrolytes via electrostatic cross-linking to study its adsorption characteristics. The DNA–chitosan hydrogel matrix contains (i) cationic (NH3+) and anionic (PO4−) sites for electrostatic binding with ionic species, (ii) -OH and -NH2 groups and heteroaromatic DNA nucleobases for chelation of heavy metal ions, and (iii) DNA double-helix for recognition and binding to small organic molecules of various structures and polarities. DNA–CS hydrogels efficiently bind with Hg2+, Pb2+,

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7

Kim, Hak Yeong, Taewook Yang, Wansoo Huh, Young-Je Kwark, Yunsang Lee, and Il Won Kim. "The Combined Effects of Sr(II) and Poly(Acrylic Acid) on the Morphology of Calcite." Materials 12, no. 20 (2019): 3339. http://dx.doi.org/10.3390/ma12203339.

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Biomineralization of calcium carbonate has interesting characteristics of intricate morphology formation with controlled crystal polymorphs. In particular, modification of calcite morphology with diverse additives has been the focus of many biomimetic and bioinspired studies. The possible role of strontium ions in enhancing the morphology-modifying ability of macromolecules was investigated. In the present study, concentrations of strontium ions were comparable to that in seawater, and anionic poly(acrylic acid) and cationic poly(ethylene imine) were used as model macromolecules. When strontiu

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8

Pulletikurthi, Giridhar, Maryam Shapouri Ghazvini, Tong Cui, et al. "Electrodeposition of zinc nanoplates from an ionic liquid composed of 1-butylpyrrolidine and ZnCl2: electrochemical, in situ AFM and spectroscopic studies." Dalton Transactions 46, no. 2 (2017): 455–64. http://dx.doi.org/10.1039/c6dt04149c.

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9

Ma, Dongxin, Chen Zhang, Yong Qiu, and Lian Duan. "Highly efficient blue-green organic light-emitting diodes achieved by controlling the anionic migration of cationic iridium(iii) complexes." Journal of Materials Chemistry C 4, no. 24 (2016): 5731–38. http://dx.doi.org/10.1039/c6tc01302c.

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10

Liu, Lin, Xiao-Nan Zhang, Zheng-Bo Han, Ming-Liang Gao, Xiao-Man Cao, and Shi-Ming Wang. "An InIII-based anionic metal–organic framework: sensitization of lanthanide (III) ions and selective absorption and separation of cationic dyes." Journal of Materials Chemistry A 3, no. 27 (2015): 14157–64. http://dx.doi.org/10.1039/c5ta00986c.

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11

Johnson, Ken I., Sunil K. Sharma, Priyanka R. Sharma, Abdulrahman G. Alhamzani, and Benjamin S. Hsiao. "Aluminum-Crosslinked Nanocellulose Scaffolds for Fluoride Removal." Nanomaterials 14, no. 12 (2024): 1032. http://dx.doi.org/10.3390/nano14121032.

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Anionic carboxylated cellulose nanofibers (CNF) are effective media to remove cationic contaminants from water. In this study, sustainable cationic CNF-based adsorbents capable of removing anionic contaminants were demonstrated using a simple approach. Specifically, the zero-waste nitro-oxidization process was used to produce carboxylated CNF (NOCNF), which was subsequently converted into a cationic scaffold by crosslinking with aluminum ions. The system, termed Al-CNF, is found to be effective for the removal of fluoride ions from water. Using the Langmuir isotherm model, the fluoride adsorpt

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12

Leopold, Nicolae, Andrei Stefancu, Krisztian Herman, et al. "The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement." Beilstein Journal of Nanotechnology 9 (August 22, 2018): 2236–47. http://dx.doi.org/10.3762/bjnano.9.208.

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Chloride-capped silver nanoparticles (Cl-AgNPs) allow for high-intensity surface-enhanced Raman scattering (SERS) spectra of cationic molecules to be obtained (even at nanomolar concentration) and may also play a key role in understanding some fundamental principles behind SERS. In this study, we describe a fast (<10 min) and simple protocol for obtaining highly SERS-active colloidal silver nanoparticles (AgNPs) with a mean diameter of 36 nm by photoconversion from AgCl precursor microparticles in the absence of any organic reducing or capping agent. The resulting AgNPs are already SERS-act

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13

Kang, Jin-Wei, and Han-Yi Chen. "Cation-Modified Anionic Redox Mechanism for High-Performance Layered Oxide As Sodium-Ion Batteries Cathode Material." ECS Meeting Abstracts MA2022-01, no. 3 (2022): 490. http://dx.doi.org/10.1149/ma2022-013490mtgabs.

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Sodium-ion batteries (NIBs) have been selected as a promising candidate for large-scale energy storage systems due to their abundance. Among several NIB cathode materials, P2-type transition metal layered oxides (NaxTMO2, TM = Ti, V, Cr, Mn, Fe, Co, Ni) featuring high theoretical capacity and better rate performance have attracted much attention. However, the practical applications have to endure the low energy density of NIB cathode materials compared to lithium-ion batteries. In tradition, the capacity is constrained by transition metal ions and is closed to their limits. Hence,in order to o

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14

Chakraborty, Nilanjan, Arijit Chakraborty, and Suman Das. "Hydrazone derivative of 2-hydroxyquinoline-3-carbaldehyde: an efficient anionic and cationic sensor." Canadian Journal of Chemistry 98, no. 12 (2020): 779–86. http://dx.doi.org/10.1139/cjc-2020-0108.

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A hydrazone (1) based on 2-hydroxyquinoline-3-carbaldehyde was synthesized and its anion and cation detection ability were studied. It could detect both fluoride in acetonitrile selectively among anions and copper ions in semiaqueous medium among cations. The addition of fluoride ion to the acetonitrile solution of the receptor produced a sharp colour change from light yellow to bluish green. The corresponding UV–vis measurements showed a red shift of the band of receptor 1 for fluoride and a blue shift of the band for copper ions. The fluorescence intensity of the receptor 1 got quenched with

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15

Rojas-Dotti, Carlos, Adrián Sanchis-Perucho, Marta Orts-Arroyo, et al. "Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes." Magnetochemistry 6, no. 2 (2020): 20. http://dx.doi.org/10.3390/magnetochemistry6020020.

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Two mononuclear ReIV complexes of general formula (PPh4)2[ReX6] [PPh4+ = tetraphenylphosphonium cation, X = Br (1) and I (2)] have been prepared and structurally and magnetically characterised. Both compounds crystallise in the triclinic system with space group Pī. Their structures are made up of hexahalorhenate(IV), [ReX6]2−, anions, and bulky PPh4+ cations. Each ReIV ion in 1 and 2 is six-coordinate and bonded to six halide ions in a quasi regular octahedral geometry. In their crystal packing, the [ReX6]2− anions are well separated from each other through the organic cations, generating alte

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16

Inoue, Katsutoshi. "ADSORPTIVE REMOVAL OF HAZARDOUS INORGANIC ELEMENTS FROM WATER BY USING ORANGE WASTE." Indonesian Journal of Chemistry 8, no. 3 (2010): 293–99. http://dx.doi.org/10.22146/ijc.21581.

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Pectic acid contained in some fruits like orange and apple is natural chelating polymeric material, exhibiting excellent adsorption behavior for some cationic metal ions including toxic heavy metals such as lead and copper. In addition, it also exhibits excellent adsorption behavior for some hazardous inorganic anionic species like phosphorus, arsenic and fluoride by loading some high valence cationic metal ions like zirconium(IV) in advance.For the practical application to the removal of these hazardous inorganic elements from various waste water at cheap cost, orange juice residue was employ

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17

Boileau, L. J. R., E. Nieboer, and D. H. S. Richardson. "Uranium accumulation in the lichen Cladonia rangiferina. Part I. Uptake of cationic, neutral, and anionic forms of the uranyl ion." Canadian Journal of Botany 63, no. 3 (1985): 384–89. http://dx.doi.org/10.1139/b85-045.

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Evidence from published work is first reviewed to show that cationic, neutral, and anionic complexes of the uranyl ion are available to plants growing in uranium-enriched environments. The results of a study on the uptake of uranyl ions by the lichen Cladonia rangiferina L. Wigg. are then presented. Uptake was examined from three different uranyl solutions each predominantly containing a single species: namely, the cation [Formula: see text] (in distilled water), the neutral 1:1 complex with phthalate (UO2L), and the anionic complex of oxalate [Formula: see text]. Uptake decreased along the ch

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18

Wang, Hong-Zhan, and Richard D. Veenstra. "Monovalent Ion Selectivity Sequences of the Rat Connexin43 Gap Junction Channel." Journal of General Physiology 109, no. 4 (1997): 491–507. http://dx.doi.org/10.1085/jgp.109.4.491.

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The relative permeability sequences of the rat connexin 43 (rCx43) gap junction channel to seven cations and chloride were examined by double whole cell patch clamp recording of single gap junction channel currents in rCx43 transfected neuroblastoma 2A (N2A) cell pairs. The measured maximal single channel slope conductances (γj, in pS) of the junctional current-voltage relationships in 115 mM XCl were RbCl (103) ≥ CsCl (102) &gt; KCl (97) &gt; NaCl (79) ≥ LiCl (78) &gt; TMACl (65) &gt; TEACl (53) and for 115 mM KY were KBr (105) &gt; KCl (97) &gt; Kacetate (77) &gt;

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19

Kuczera, Janina, Teresa E. Krai, Marian Podolak, and Stanisław Przestalski. "A Joint Effect of Cationic and Anionic Amphiphilic Compounds on the Desorption of Calcium Ions from Lecithin Liposome Membranes." Zeitschrift für Naturforschung C 54, no. 5-6 (1999): 429–37. http://dx.doi.org/10.1515/znc-1999-5-620.

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Abstract The aim of the work was to determine the synergism and antagonism of mixtures of the cationic amphiphilic compounds: N-benzyl-N,N-dimethyl-N-tetradecylammonium chloride (BD TA), N-benzyl-N,N-dimethyl-N-dodecylammonium chloride (BDDA), N-methyl-N-te-tradecyl-morpholinium bromide (MTM), N,N,N-trimethyl-N-tetradecylammonium bromide (TMTA) and those of tripropyltin chloride in a mixture with amphiphilic anionic compounds (a homologous series of sodium alkylsulfonates with n = 2, 4, 6, 8, 10, 12 and 14 alkyl carbon atoms) in the process of calcium ion desorption from liposome lecithin memb

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20

Sarfraz, Sadaf, Safdar Ameer, Mohsin Javed, et al. "Removal of hexavalent chromium ions using micellar modified adsorbent: isothermal and kinetic investigations." RSC Advances 12, no. 37 (2022): 23898–911. http://dx.doi.org/10.1039/d2ra03906k.

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21

Kudaibergenov, Sarkyt. "Physicochemical, Complexation and Catalytic Properties of Polyampholyte Cryogels." Gels 5, no. 1 (2019): 8. http://dx.doi.org/10.3390/gels5010008.

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Polyampholyte cryogels are a less considered subject in comparison with cryogels based on nonionic, anionic and cationic precursors. This review is devoted to physicochemical behavior, complexation ability and catalytic properties of cryogels based on amphoteric macromolecules. Polyampholyte cryogels are able to exhibit the stimuli-responsive behavior and change the structure and morphology in response to temperature, pH of the medium, ionic strength and water–organic solvents. Moreover, they can uptake transition metal ions, anionic and cationic dyes, ionic surfactants, polyelectrolytes, prot

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22

Gao, Wei, Feng Liu, Chang-Wei Pan, Xiu-Mei Zhang, Jie-Ping Liu, and Qing-Yu Gao. "A stable anionic metal–organic framework with open coordinated sites: selective separation toward cationic dyes and sensing properties." CrystEngComm 21, no. 7 (2019): 1159–67. http://dx.doi.org/10.1039/c8ce02060d.

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A multifunctional anionic metal–organic framework was successfully synthesized using a new pyridyl–tricarboxylate ligand. It could be applied as a luminescent sensor for Fe<sup>3+</sup> ions and TNP and it showed selective adsorption of cationic dyes.

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23

Jin, J. C., X. Y. Liu, G. P. Yang, L. Hou, and Y. Y. Wang. "A microporous anionic metal–organic framework for aqueous encapsulation and highly reversible sensitization of light-emitting Tb³⁺ ions." New Journal of Chemistry 46, no. 11 (2022): 5201–5. http://dx.doi.org/10.1039/d1nj02418c.

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An anionic porous material can serve as both a host and an antenna for protecting and sensitizing extra-framework light-emitting Eu3+/Tb3+ ions. The Tb3+ uptake and release is a reversible process and the cationic Tb3+ can be gradually released.

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Diru, Mariana, and Natalia Tachi. "The study of 2-methyl-8-hydroxyquinolines as ionophores for cation-selective electrodes." Studia Universitatis Moldaviae. Seria Științe ale Naturii, no. 6(166) (April 2024): 113–17. http://dx.doi.org/10.59295/sum6(166)2023_15.

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In this paper, a comparative study of cation-selective electrodes with the same polymer film composition was performed. The following components were used to prepare the membrane: polyvinyl chloride, a matrix in which all the components are embedded; tetrahydrofuran, a solvent for all components; ionophore 2-methyl-8-hydroxyquinoline; plasticizer 2-nitrophenyloctyl ether.3 sensors were assembled from the prepared membranes, and the sensors were preconditioned in Cu2+, Pb2+, Hg2+ solutions. The electrode preconditioned in solutions containing Hg2+ ions have an anionic function. The electrode pr

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25

Ningrum, Eva Oktavia, Suprapto Suprapto, Saidah Altway, et al. "Effect of Synthesis Temperature on Adsorbent Performance of Blending Anionic and Cationic Gels in Divalent Metal Ions Adsorption." Indonesian Journal of Chemistry 24, no. 1 (2024): 23. http://dx.doi.org/10.22146/ijc.82104.

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In this study, the anionic and cationic gels were synthesized separately using copolymerization between N-isopropylacrylamide (NIPAM) and acrylic acid or chitosan through a polymerization reaction using N,N'-methylenebisacrylamide (MBAA) as a cross-linker with various monomer concentrations and synthesis temperature. The anionic and cationic gels were blended to minimize inter-intra particle association and to improve the adsorption ability. The FTIR analysis found that the synthesis of the NIPAM-co-acrylic acid and NIPAM-co-chitosan gels was successfully carried out, indicating no presence of

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Lyubimtseva, N. G., E. I. Marchenko, N. N. Eremin, and N. S. Bortnikov. "TO A QUESTION OF SULFUR SITES IN CRYSTAL STRUCTURES OF TETRAHEDRITE GROUP MINERALS: RELATIONSHIPS BETWEEN OCCUPANCY, EFFECTIVE ION SIZES, AND UNIT CELL PARAMETERS." Доклады Российской академии наук. Науки о Земле 512, no. 1 (2023): 66–71. http://dx.doi.org/10.31857/s2686739723601138.

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In this work, a crystal chemical analysis of the known experimentally deciphered crystal structures of tetrahedrite group minerals was carried out in order to reveal the relationships between the occupancies of anion crystallographic sites in the structures, their effective sizes and unit cell parameters. To achieve this aim, we analyzed the effective sizes of the 24g and 2a anion sites in 68 deciphered crystal structures of tetrahedrite group minerals according to the published data. The analysis was carried out using the TOPOSPro software package by partitioning the space into Voronoi–Dirich

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Kang, Ming, Huanzhao Guo, Wende Zhu, Xianrong Luo, and Jianwen Yang. "The Improvement and Application of the Electrogeochemical Exploration Method." Applied Sciences 13, no. 4 (2023): 2735. http://dx.doi.org/10.3390/app13042735.

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The anionic and cationic species of elements from deeply buried deposits migrate to the near surface driven by various geological forces. The applied electric field is used to collect these active ions to the designed electrode, and ions with a negative charge go to the anode and positive to the cathode, which is called electrogeochemical exploration method, also called CHIM. Prospecting effect has been investigated by researchers since the coming up of CHIM. However, the cumbersome technical equipment, complex techniques and low production efficiency have restricted its potential application

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ZENG, Youchun, Xianlin HAN, and Richard W. GROSS. "Phospholipid-subclass-specific partitioning of lipophilic ions in membrane–water systems." Biochemical Journal 338, no. 3 (1999): 651–58. http://dx.doi.org/10.1042/bj3380651.

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Herein, we systematically investigate phospholipid-subclass-specific alterations in the partitioning of both cationic and anionic amphiphiles to identify the importance of ester, ether and vinyl ether linkages at the sn-1 position of phospholipids in the partitioning of charged amphiphiles. The results demonstrated that the membrane–water partition coefficient of a prototypic cationic amphiphile (i.e. 3,3´-dipropylthiadicarbocyanine iodide) was approximately 2.5 times higher in membranes comprised of plasmenylcholine in comparison with membranes comprised of either phosphatidylcholine or plasm

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Artemiev, A. V., and G. V. Mitrofanova. "The use of anionic flocculant in water treatment for flotation of apatite-nepheline ores." Vestnik MGTU 23, no. 2 (2020): 150–59. http://dx.doi.org/10.21443/1560-9278-2020-23-2-150-159.

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Currently, an urgent problem is the improvement of methods for purification of industrial water from concentrates of suspended particles and water-soluble impurities using polyacrylamide flocculants. By studying the adsorption processes from aqueous solutions of H and OH ions, the acid-base properties of the surface of the solid phase of the most contaminated technological product have been analyzed, i. e. discharge of the thickener of apatite concentrate, the mineral composition of which is 90 % represented by apatite. The influence of reagents present in the processing technology (fatty acid

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Jayanta, K. Ghosh, and Ch. Bhattacharya Subhash. "Spectral studies on the interaction of safranine T, phloxin, fluorescein with inorganic ions and their photogalvanic effect." Journal of Indian Chemical Society Vol.79, Mar 2002 (2002): 225–30. https://doi.org/10.5281/zenodo.5848205.

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Department of Chemistry, Jadavpur University, Kolkata-700 032. India <em>E-mail : </em>sbjuchem@hotmail.com                            <em>Fax : </em>91-33-4731484 <em>Manuscript received 6 December 2000, revised 17 August 2001, accepted 28 August 2001</em> The system consisting of anionic dye fluorescein with inorganic ions in aqueous solution generates photovoltage when studied in photogalvanic cell. Fluorescein dye produces much greater photovoltage compared to other anionic dye phloxin (2,4,5,7- tetrabromo-3&#3

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Du, Chang, Xiaodi Chen, Hongping Wu, et al. "A novel cationic covalent organic framework as adsorbent for simultaneous removal of methyl orange and hexavalent chromium." RSC Advances 13, no. 34 (2023): 24064–70. http://dx.doi.org/10.1039/d3ra03726f.

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A novel guanidinium-based ionic covalent organic framework (ICOF) was synthesized and exhibited highly efficient and simultaneous removal of anionic organic dyes methyl orange and heavy metal ions Cr(vi).

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Nagarajan, Sudhan, Sooyeon Hwang, Mahalingam Balasubramanian, Naresh Kumar Thangavel, and Leela Mohana Reddy Arava. "Investigating Mixed Cationic and Anionic Redox Chemistry in Chalcogen Based Cathodes for Li-Ion Batteries." ECS Meeting Abstracts MA2022-02, no. 3 (2022): 304. http://dx.doi.org/10.1149/ma2022-023304mtgabs.

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Current state-of-the-art Li-ion batteries are reaching their theoretical limit with respect to the capacity, a property largely limited by cathode materials that have so far relied solely on cationic-redox of transition-metal ions (e.g., M3+/4+ in LiMO2 where M is Co, Ni, and Mn) for driving the electrochemical reactions. Recently, the introduction of new anion-redox cathode materials can lead to a doubling of capacity by accommodating multielectron redox chemistries that have gained research interest. (1) However, current anion-redox cathode materials based on Li-rich layered oxides (represen

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Choi, Insil, and Il Won Kim. "Molecular Dynamics Simulation to Understand the Ability of Anionic Polymers to Alter the Morphology of Calcite." International Journal of Polymer Science 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/7594950.

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Molecular dynamics was utilized to investigate the ability of anionic macromolecules to drastically change the morphology of calcite in the presence of magnesium ions. Anionic poly(acrylic acid) and poly(methacrylic acid) were compared with cationic poly(ethylene imine) in their binding behavior on calcite (104) and (110) surfaces. Poly(acrylic acid) and poly(methacrylic acid) showed preferential binding on (110) with strong electrostatic attractions, whereas poly(ethylene imine) was only weakly attracted to (104). The extent of the charge imbalance on the surfaces appeared responsible for the

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Javed, Rida, Luqman Ali Shah, Murtaza Sayed, and Muhammad Saleem Khan. "Uptake of heavy metal ions from aqueous media by hydrogels and their conversion to nanoparticles for generation of a catalyst system: two-fold application study." RSC Advances 8, no. 27 (2018): 14787–97. http://dx.doi.org/10.1039/c8ra00578h.

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Poly(methacrylic acid) (P(MAA)), poly(acrylamide) (P(AAm)) and poly(3-acrylamidopropyltrimethyl ammonium chloride) (P(APTMACl)) were synthesized as anionic, neutral and cationic hydrogels respectively.

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Buncel, Erwin, Ruby Nagelkerke, and Gregory RJ Thatcher. "Alkali metal ion catalysis in nucleophilic displacement by ethoxide ion on p-nitrophenyl phenylphosphonate: Evidence for multiple metal ion catalysis." Canadian Journal of Chemistry 81, no. 1 (2003): 53–63. http://dx.doi.org/10.1139/v02-202.

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In continuation of our studies of alkali metal ion catalysis and inhibition at carbon, phosphorus, and sulfur centers, the role of alkali metal ions in nucleophilic displacement reactions of p-nitrophenyl phenylphosphonate (PNPP) has been examined. All alkali metal ions studied acted as catalysts. Alkali metal ions added as inert salts increased the rate while decreased rate resulted on M+ complexation with 18-crown-6 ether. Kinetic analysis indicated the interaction of possibly three potassium ions, four sodium ions, and five lithium ions in the transition state of the reactions of ethoxide w

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Näther, Christian, Nicola Herzberg, and Wolfgang Bensch. "Infinite Anionic Chains Formed by Alternating Bidentately Acting [SbS4]3- Anions and [Mn(dien)]2+ Complexes in the Compound [Mn(dien)2][Mn(dien)SbS4]2." Zeitschrift für Naturforschung B 68, no. 5-6 (2013): 605–10. http://dx.doi.org/10.5560/znb.2013-3039.

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The new compound [Mn(dien)2][Mn(dien)SbS4]2 (dien=diethylenetriamine) was synthesized under solvothermal conditions. It crystallizes in the non-centrosymmetric monoclinic space group P21 with a=7.5736(5), b=19.1081(16), c=13.1174(11) Å, b =90:022(9) , V =1898.3(3) Å3, and Z =2. The crystal structure is composed of one [Mn(dien)2]2+ cation and an anionic chain composed of [SbS4]3- anions and [Mn(dien)2]2+ cations. The [SbS4]3- anions connect [Mn(dien)2]2+ ions in a μ2-fashion to form an undulated {[Mn(dien)SbS4]}-2 chain running along [001]. The Mn2+ ions in the chain are in a rare distorted re

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Iancu, Stefania D., Andrei Stefancu, Vlad Moisoiu, Loredana F. Leopold, and Nicolae Leopold. "The role of Ag+, Ca2+, Pb2+ and Al3+ adions in the SERS turn-on effect of anionic analytes." Beilstein Journal of Nanotechnology 10 (November 27, 2019): 2338–45. http://dx.doi.org/10.3762/bjnano.10.224.

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In our recent studies we highlighted the role of adsorbed ions (adions) in turning on the surface-enhanced Raman scattering (SERS) effect in a specific mode for anionic and cationic analytes. In this work, we emphasize the role of Ag+, Ca2+, Pb2+ and Al3+ adions in the specific adsorption of anionic analytes such as the citrate capping agent and three organic acids. Our results suggest an adion-specific adsorption mechanism: the adsorption of anionic analytes is facilitated by positively charged adions such as Ag+, Ca2+, Pb2+ or Al3+, which provide adsorption sites specific for the anionic ana

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Streltsova, E. A., O. V. Voliuvach, and E. D. Bondar. "SURFACE TENSION AND ASSOCIATION IN AQUEOUS SOLUTION SURFACTANTS IN THE PRESENCE OF POLYACRYLAMIDE." Odesa National University Herald. Chemistry 26, no. 4(80) (2021): 70–80. http://dx.doi.org/10.18524/2304-0947.2021.4(80).250930.

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The surface tension of aqueous solutions of cationic (dodecylammonium and dodecylpyridinium chlorides) and anionic (sodium dodecylsulfate) surfactants was measured in the presence of polyacrylamide in the solution. A synergistic effect of reducing the surface tension of mixed solutions of cationic surfactants, in the region of sufficiently high concentrations of mixed solutions of sodium dodecyl sulfate, with polyacrylamide in the range of molar ratios of the mixture components - n (Surfactants : PAA) = 1: 1; 1: 0.25 was established. The values of the maximum adsorption, the values of the

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Shen, Xiang, and Bing Yan. "Anionic metal–organic framework hybrids: functionalization with lanthanide ions or cationic dyes and fluorescence sensing of small molecules." RSC Advances 6, no. 34 (2016): 28165–70. http://dx.doi.org/10.1039/c6ra02043g.

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An anionic metal–organic framework, [HDMA]<sub>2</sub>[Zn<sub>2</sub>(BDC)<sub>3</sub>(DMA)]·6DMF is modified by lanthanides and they exhibit selective adsorption ability to cationic dyes. RhB@1 has a rapidest response and realizes sensing acetone and aniline.

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Saarimaa, Ville, Anna Sundberg, Bjarne Holmbom, and Mikael Svedman. "Effects of calcium on peroxide bleaching and washing of thermomechanical pulp." TAPPI Journal 5, no. 10 (2006): 21–26. https://doi.org/10.32964/tj5.10.21.

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Since the white water from the paper machine is currently reused in mechanical pulping, high concentrations of calcium ions released from fillers and coating pigments enter the mechanical pulping process. Calcium ions may interact with wood-derived anionic substances, such as pectic acids that are formed and released in peroxide bleaching. In this study, the influence of calcium on retention of pectic acids in pulp, drainage of pulp, and sheet brightness was studied. Presence of calcium ions strongly increased the retention of pectic acids and wood pitch in pulp. Thus, the cationic demand of t

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Mishra, T., A. K. Mohanty, and S. K. Tiwari. "Recent Development in Clay Based Functional Coating for Corrosion Protection." Key Engineering Materials 571 (July 2013): 93–109. http://dx.doi.org/10.4028/www.scientific.net/kem.571.93.

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There is a large variety of techniques available to protect metals from various types of corrosion. Till date chromate containing metal coatings is one of the most commonly used methods. Layered clays are basically of two types depending on the type of ion exchange capacity. In the recent years different researchers demonstrated the use of such cation/ anionic clays as potential nanocontainers for the inhibitors. These nanocontainers can be used in the coating to induce self-repairing capacity when the coating surface is damaged. Due to the disturbance in the pH and availability of chloride io

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Zulfiana, Deni, Azizatul Karimah, Sita Heris Anita, et al. "Antimicrobial Imperata cylindrica paper coated with anionic nanocellulose crosslinked with cationic ions." International Journal of Biological Macromolecules 164 (December 2020): 892–901. http://dx.doi.org/10.1016/j.ijbiomac.2020.07.102.

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Wilson, Martin, and Evanna Gleason. "An unusual voltage-gated anion channel found in the cone cells of the chicken retina." Visual Neuroscience 6, no. 1 (1991): 19–23. http://dx.doi.org/10.1017/s0952523800000870.

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AbstractUsing the whole-cell patch clamp technique, we have examined the voltage-gated currents present in adult chicken cone cells. When calcium and calcium-gated currents are blocked, hyperpolarizing voltage steps elicit slowly increasing inward currents as has been shown for photoreceptors in other species. Unlike the case for other species, chicken cones appear to lack the inward-rectifying cationic current Ih that contributes to the shaping of the photovoltage. Instead of Ih, these cones possess an anionic inward-rectifying current that in kinetics, activation range and probably function

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Gan, L. "Micellar Effects on the Formation of the 1,3,5-Trinitrobenzene-Cyanide Complex in Water." Australian Journal of Chemistry 38, no. 8 (1985): 1141. http://dx.doi.org/10.1071/ch9851141.

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The anionic σ-complex from cyanide ion and 1,3,5-trinitrobenzene in water was stabilized by cationic micelles. The binding of counter ions to the micellar head groups in hexadecyl-trimethylammonium cyanidefollowed a distribution model with the counter ion binding constant KCN = 1400 mol-1 dm3. The bromide-cyanide ion exchange constant, KCNBr, was equal to 1.28. These results rendered further support to the general applicability of the distribution model.

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Cao, Chun, Hongliang Kang, Ning Che, et al. "Wool graft polyacrylamidoxime as the adsorbent for both cationic and anionic toxic ions from aqueous solutions." RSC Adv. 4, no. 105 (2014): 60609–16. http://dx.doi.org/10.1039/c4ra10514a.

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Wool graft polyacrylamidoxime (W-g-PAO) was synthesized using coarse wool as the raw keratin material. The W-g-PAO can be used as the cheap and excellent adsorbent for the removal of both cationic and anionic toxic ions from waste water. The approach can be extended to the modification of other waste raw keratin materials and used them as the blocks for the fabrication of functional materials.

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Koyuncu, I., M. Yazgan, D. Topacik, and H. Z. Sarikaya. "Evaluation of the low pressure RO and NF membranes for an alternative tyreatment of Buyukcekmece Lake." Water Supply 1, no. 1 (2001): 107–15. http://dx.doi.org/10.2166/ws.2001.0013.

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The recent development of new generation LPRO and LPNF membranes has received attention for application in the field of wastewater and water treatment through an increasingly stringent regulation for drinking water purposes and water reclamation. This paper presents the pilot scale membrane separation studies on Buyukcekmece Lake in Istanbul with low pressure reverse osmosis (LPRO) and low pressure nanofiltration (LPNF) membranes. The application to treatment of anionic and cationic pollutants (Na+, Mg2+, Ca2+, Cl–, SO42–, NO3–) has been investigated as a function of transmembrane pressure and

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Sadli, Farah Najieha Mohd, Masyitah Husna Ammer, and Mohd Yunus Shukor. "Yeast Inhibitive Assay for Anionic Heavy Metals: A review." Bioremediation Science and Technology Research 10, no. 1 (2022): 30–36. http://dx.doi.org/10.54987/bstr.v10i1.686.

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One of the most common types of pollution that has a negative impact on the biotic community in aquatic habitats is heavy metal poisoning of the water. Both essential and non-essential heavy metals can be toxic to living things if their concentrations are too high for their bioavailability. Although the toxicity of heavy metals, and especially anionic metal ions, is better known than that of cationic metal ions, it is just as toxic, if not more so. The focus of this review is on the usefulness of eukaryotic organisms like yeast, Saccharomyces cerevisiae, for toxicity assessment because they ca

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Seth, Soana, Govardhan Savitha, and Jarugu Narasimha Moorthy. "Diverse isostructural MOFs by postsynthetic metal node metathesis: anionic-to-cationic framework conversion, luminescence and separation of dyes." Journal of Materials Chemistry A 3, no. 45 (2015): 22915–22. http://dx.doi.org/10.1039/c5ta04551g.

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Postsynthetic metal-node metathesis of a flexible, yet robust porous anionic Cd–MOF with different metal ions of varying ionic radii, charges and chemical nature leads to diverse isostructural MOFs. The Eu@MOF and Tb@MOF – accessed by PSME – are brilliantly luminescent. The modified MOFs permit organic dye separation.

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Belaid, Kumar Djamal, and Hichem Seddiki. "Influence of anions and cations on the oxidation of basic blue 26 and basic violet 3 dyes by the Fenton process." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 1 (2024): 2423–40. http://dx.doi.org/10.54021/seesv5n1-120.

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Among the advanced oxidation processes (AOP) used to treat textile effluents, the Fenton process is particularly appreciated for its ability to effectively treat pollutants that are difficult to degrade by other conventional methods, such as synthetic dyes, especially basic or cationic dyes, which present the highest poisoning rates, underscoring the harmful nature of these substances. We conducted an examination in this context, concentrating on the impact of ions on dye degradation at a temperature of 294 K. This is because ions in solution left over from chemicals used during manufacturing

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SOUDA, RYUTARO. "FEMTOSECOND ELECTRON DYNAMICS ON SOLID SURFACES PROBED BY ION SCATTERING AND STIMULATED DESORPTION OF SECONDARY IONS." International Journal of Modern Physics B 14, no. 11 (2000): 1139–77. http://dx.doi.org/10.1142/s0217979200001436.

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In this article, the mechanism of electronic transitions during scattering and stimulated desorption of ions from solid surfaces is discussed. Reactive ions such as H + and O + experience transient chemisorption during scattering from solid surfaces. These ions are neutralized almost completely on metal and semiconductor surfaces due to the band effect on resonance neutralization. The neutralization probability of H + is suppressed considerably on highly ionic compound surfaces and is dependent on the target species due to the formation of the bound state (on cations) or the surface molecule (

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