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New Prospects of Colloid Chemistry – Molecular Perspectives
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New Prospects of Colloid Chemistry – Molecular Perspectives

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Physical Chemistry and Chemical Physics".

Deadline for manuscript submissions: closed (15 December 2023) | Viewed by 2516

Special Issue Editors

Dr. Yu. G. Galyametdinov

E-Mail Website
Guest Editor
Physical and Colloid Chemistry Department, Kazan National Research Technological University, Kazan 420015, Russia
Interests: development of methods for synthesis of metal-containing liquid crystalline compounds, study of their molecular structure and organization, characterization of their physicochemical properties and specific features
Dr. Artem Bezrukov

E-Mail Website
Guest Editor
Physical and Colloid Chemistry Department, Kazan National Research Technological University, Kazan 420015, Russia
Interests: study of supramolecular systems in microfluidic devices, their physicochemical characterization and modification

Special Issue Information

Dear Colleagues,

Modern trends in colloid and interface science focus on synthesis of highly organized molecular systems with smart stimuli-responsive capabilities. These systems are represented by a variety of building blocks such as surfactant and polymer micelles, quantum dots, lyotropic liquid crystals, and etc. Their unique properties offer new solutions for such applications as molecular electronics, diagnostics, and biomedicine.

Colloid systems made up of such molecular ensembles possess an intrinsic sensitivity to a variety of external and internal factors. They can change their intermolecular organization, surface activity, or optical properties responding to changes in pH or concentrations of components, applied magnetic or electric fields or excitation light.

This Special Issue of International Journal of Molecular Sciences aims at discussing new trends in chemistry of colloids emerging from research in synthesis, characterization, and interactions of constituent molecular building blocks and ensembles: micellar systems of surfactant and polymers, quantum dots, luminescent compounds, lyotropic liquid crystals, microemulsions, gels, and their combinations.

The Special issue is intended to highlight potential of colloid systems as efficient media and platforms that offer new approaches to synthesis of functional nanoscale intermolecular systems in favourable reactive conditions. It discusses new fundamental advancements in modification and characterization of such systems and their applications for molecular diagnostics and biomedicine.

Dr. Yu. G. Galyametdinov
Dr. Artem Bezrukov
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • disperse systems

  • surfactant aggregates
  • luminescent complexes
  • quantum dots
  • mesogens
  • polymer colloids
  • drug delivery systems

Published Papers (2 papers)

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Research

18 pages, 5330 KiB  
Article
Tuning Molecular Orientation Responses of Microfluidic Liquid Crystal Dispersions to Colloid and Polymer Flows
by Artem Bezrukov and Yury Galyametdinov
Int. J. Mol. Sci. 2023, 24(17), 13555; https://doi.org/10.3390/ijms241713555 - 31 Aug 2023
Viewed by 962
Abstract
An important approach to molecular diagnostics is integrating organized substances that provide complex molecular level responses to introduced chemical and biological agents with conditions that optimize and distinguish such responses. In this respect, liquid crystal dispersions are attractive components of molecular diagnostic tools. [...] Read more.
An important approach to molecular diagnostics is integrating organized substances that provide complex molecular level responses to introduced chemical and biological agents with conditions that optimize and distinguish such responses. In this respect, liquid crystal dispersions are attractive components of molecular diagnostic tools. This paper analyzes a colloid system, containing a nematic liquid crystal as a dispersed phase, and aqueous surfactant and polymer solutions as the continuous phases. We applied a microfluidic approach for tuning orientation of liquid crystal molecules in picoliter droplets immobilized on microchannel walls. Introduction of surfactant to the aqueous phase was found to proportionally increase the order parameter of liquid crystal molecules in microdroplets. Infusion of polymer solutions into surfactant-mediated microfluidic liquid crystal dispersions increased the order parameter at much lower surfactant concentrations, while further infusion of surfactant solutions randomized the orientation of liquid crystal molecules. These effects were correlated with the adsorption of surfactant molecules on surfaces of microdroplets, stabilizing the effect of a polymer matrix on bound surfactant ions and the formation of insoluble polymer–colloid aggregates, respectively. The revealed molecular behavior of liquid crystal dispersions may contribute to optimized synthesis of responsive liquid crystal dispersions for in-flow molecular diagnostics of polymers and colloids, and the development of functional laboratory-on-chip prototypes. Full article
(This article belongs to the Special Issue New Prospects of Colloid Chemistry – Molecular Perspectives)
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30 pages, 8899 KiB  
Article
Synthesis, Properties, and Biomedical Application of Dicationic Gemini Surfactants with Dodecane Spacer and Carbamate Fragments
by Leysan Vasileva, Gulnara Gaynanova, Farida Valeeva, Elvira Romanova, Rais Pavlov, Denis Kuznetsov, Grigory Belyaev, Irina Zueva, Anna Lyubina, Alexandra Voloshina, Konstantin Petrov and Lucia Zakharova
Int. J. Mol. Sci. 2023, 24(15), 12312; https://doi.org/10.3390/ijms241512312 - 1 Aug 2023
Cited by 1 | Viewed by 1171
Abstract
A synthesis procedure and aggregation properties of a new homologous series of dicationic gemini surfactants with a dodecane spacer and two carbamate fragments (N,N′-dialkyl-N,N′-bis(2-(ethylcarbamoyloxy)ethyl)-N,N′-dimethyldodecan-1,6-diammonium dibromide, n-12-n(Et), where n = 10, 12, 14) were comprehensively described. The critical micelle concentrations of gemini surfactants were [...] Read more.
A synthesis procedure and aggregation properties of a new homologous series of dicationic gemini surfactants with a dodecane spacer and two carbamate fragments (N,N′-dialkyl-N,N′-bis(2-(ethylcarbamoyloxy)ethyl)-N,N′-dimethyldodecan-1,6-diammonium dibromide, n-12-n(Et), where n = 10, 12, 14) were comprehensively described. The critical micelle concentrations of gemini surfactants were obtained using tensiometry, conductometry, spectrophotometry, and fluorimetry. The thermodynamic parameters of adsorption and micellization, i.e., maximum surface excess (Гmax), the surface area per surfactant molecule (Amin), degree of counterion binding (β), and Gibbs free energy of micellization (∆Gmic), were calculated. Functional activity of the surfactants, including the solubilizing capacity toward Orange OT and indomethacin, incorporation into the lipid bilayer, minimum inhibitory concentration, and minimum bactericidal and fungicidal concentrations, was determined. Synthesized gemini surfactants were further used for the modification of liposomes dual-loaded with α-tocopherol and donepezil hydrochloride for intranasal treatment of Alzheimer’s disease. The obtained liposomes have high stability (more than 5 months), a significant positive charge (approximately + 40 mV), and a high degree of encapsulation efficiency toward rhodamine B, α-tocopherol, and donepezil hydrochloride. Korsmeyer-Peppas, Higuchi, and first-order kinetic models were used to process the in vitro release curves of donepezil hydrochloride. Intranasal administration of liposomes loaded with α-tocopherol and donepezil hydrochloride for 21 days prevented memory impairment and decreased the number of Aβ plaques by 37.6%, 40.5%, and 72.6% in the entorhinal cortex, DG, and CA1 areas of the hippocampus of the brain of transgenic mice with Alzheimer’s disease model (APP/PS1) compared with untreated animals. Full article
(This article belongs to the Special Issue New Prospects of Colloid Chemistry – Molecular Perspectives)
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