jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Tsung-Keng Chang | Mon‐Juan Lee | Wei Lee
Source: Biosensors (article, 2022-04-07)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Quantitative Biosensing Based on a Liquid Crystal Marginally Aligned by the PVA/DMOAP Composite for Optical Signal Amplification The working principle for a liquid crystal (LC)-based biosensor relies on the disturbance in the orderly aligned LC molecules induced by analytes at the LC-aqueous or LC-solid interface to produce optical signals that can be typically observed under a polarizing optical microscope (POM). Our previous studies demonstrate that such optical response can be enhanced by imposing a weak electric field on LCs so that they are readily tilted from the homeotropic alignment in response to lower concentrations of analytes at the LC-glass interface. In this study, an alternative approach toward signal amplification is proposed by taking advantage of the marginally tilted alignment configuration without applying an electric field. The surface of glass substrates was modified with a binary aligning agent of poly(vinyl alcohol) (PVA) and dimethyloctadecyl[3-(trimethoxysilyl)propyl] ammonium chloride (DMOAP), in which the amount of PVA was fine-tuned so that the interfacing LC molecules were slightly tilted but remained virtually homeotropically aligned to yield no light leakage under the POM in the absence of an analyte. Two nematic LCs, E7 and 5CB, were each sandwiched between two parallel glass substrates coated with the PVA/DMOAP composite for the detection of bovine serum albumin (BSA), a model protein, and cortisol, a small-molecule steroid hormone. Through image analysis of the optical appearance of E7 observed under the POM, a limit of detection (LOD) of 2.5 × 10<sup>-8</sup> μg/mL for BSA and that of 3 × 10<sup>-6</sup> μg/mL for cortisol were deduced. Both values are significantly lower than that obtained with only DMOAP as the alignment layers, which correspond to signal amplification of more than six orders of magnitude. The new approach for signal amplification reported in this work enables analytes of a wide range of molecular weights to be detected with high sensitivity. Homeotropic alignment ; Liquid crystal ; Analyte ; Biosensor ; Materials science ; Bovine serum albumin ; Vinyl alcohol ; Optical microscope ; Composite number ; Detection limit ; Aqueous solution ; Polyvinyl alcohol ; Electric field ; Analytical Chemistry (journal) ; Chromatography ; Polymer ; Chemistry ; Nanotechnology ; Optoelectronics ; Composite material ; Organic chemistry ; Scanning electron microscope Liquid Crystal Research Advancements ; Photonic and Optical Devices ; Advanced Fluorescence Microscopy Techniques
Authors: Madhusmita Rawooth | Sk Habibullah | Dilshad Qureshi | Deepti Bharti | Ankit Pal | Biswaranjan Mohanty | Maciej Jarzębski | Wojciech Smułek | Kunal Pal
Source: Polymers (article, 2022-07-08)
Field: Materials Science — Biomaterials

Effect of Tamarind Gum on the Properties of Phase-Separated Poly(vinyl alcohol) Films The current study aims to evaluate the effect of tamarind gum (TG) on the optical, mechanical, and drug release potential of poly(vinyl alcohol) (PVA)-based films. This involves preparing PVA-TG composite films with different concentrations of TG through a simple solvent casting method. The addition of TG has enhanced the phase separation and aggregation of PVA within the films, and it becomes greater with the increase in TG concentration. Brightfield and polarized light micrographs have revealed that aggregation is favored by forming crystalline domains at the PVA-TG interface. The interconnected network of PVA-TG aggregates influenced the swelling and drying properties of the films. Using Peleg's analysis, the mechanical behavior of films was determined by their stress relaxation profiles. The addition of TG has made no significant changes to the firmness and viscoelastic properties of films. However, long-durational relaxation times indicated that the interconnected network might break down in films with higher TG concentration, suggesting their brittleness. The controlled release of ciprofloxacin in HCl solution (0.5% (<i>w</i>/<i>v</i>)) appears to decrease with the increase in TG concentration. In fact, TG has inversely affected the impedance and altered the ionic conductivity within the films. This seems to have directly influenced the drug release from the films as the mechanism was found to be non-Fickian diffusion (based on Korsmeyer-Peepas and Peppas-Sahlin kinetic models). The antimicrobial study using <i>Escherichia coli</i> was carried out to evaluate the activity of the drug-loaded films. The study proves that TG can modulate the properties of PVA films and has the potential to fine-tune the controlled release of drugs from composite films. Vinyl alcohol ; Materials science ; Phase (matter) ; Diffusion ; Chemical engineering ; Swelling ; Glass transition ; Polymer chemistry ; Viscoelasticity ; Solvent ; Composite number ; Composite material ; Polymer ; Chemistry ; Organic chemistry Nanocomposite Films for Food Packaging ; Hydrogels: synthesis, properties, applications ; Dielectric materials and actuators
Authors: Qiang‐Yu Zhu | Li‐Peng Zhou | Li‐Xuan Cai | Shao‐Jun Hu | Xiaozhen Li | Qing‐Fu Sun
Source: Inorganic Chemistry (article, 2022-10-07)
Field: Chemistry — Organic Chemistry

Stereocontrolled Self-Assembly of Ln(III)–Pt(II) Heterometallic Cages with Temperature-Dependent Luminescence Structurally well-defined discrete d/f heterometallic complexes show diverse application potential in electrooptic and magnetic materials. However, precise control of the component and topology of such heterometallic compounds with fine-tuned photophysical properties is still challenging. Herein, we report the stereocontrolled syntheses of a series of Ln<sup>III</sup>-Pt<sup>II</sup> heterometallic cages through coordination-driven self-assembly of enantiopure alkynylplatinum-based metalloligands (L<sub>1</sub><sup><i>R</i>/<i>S</i></sup>, L<sub>2</sub><sup><i>R</i>/<i>S</i></sup>) with lanthanide ions (Ln = Eu<sup>III</sup>, Yb<sup>III</sup>, Nd<sup>III</sup>, Lu<sup>III</sup>). Taking advantage of the metal-to-ligand charge transfer (MLCT) excited state on the designed alkynylplatinum ligands, the excitation window for the sensitized near-infrared (NIR) luminescence on the Yb<sup>III</sup>- and Nd<sup>III</sup>-containing cages can be extended to the visible region (up to 500 nm). Linear temperature-dependent red and NIR emissions observed on the Ln<sub>4</sub>(L<sub>2</sub><sup><i>R</i>/<i>S</i></sup>)<sub>6</sub> (Ln<sup>III</sup> = Eu<sup>III</sup> and Yb<sup>III</sup>, respectively) complexes suggest their potential applications as luminescent temperature sensors, with sensitivities of -0.54% (Ln<sup>III</sup> = Eu<sup>III</sup>, 77-250 K) and -0.17% (Ln<sup>III</sup> = Yb<sup>III</sup>, 77-300 K) per K achieved. This work not only offers a good strategy to prepare new d/f heterometallic supramolecular cages but also paves the way for the design of stimuli-responsive luminescent materials. Luminescence ; Lanthanide ; Chemistry ; Enantiopure drug ; Excited state ; Supramolecular chemistry ; Ligand (biochemistry) ; Metal ; Crystallography ; Ion ; Optoelectronics ; Materials science ; Atomic physics ; Crystal structure ; Catalysis ; Physics ; Enantioselective synthesis ; Organic chemistry Supramolecular Chemistry and Complexes ; Magnetism in coordination complexes ; Lanthanide and Transition Metal Complexes
Authors: Shusei Fujiki | Kazuma Amaike | Akiko Yagi | Kenichiro Itami
Source: Nature Communications (article, 2022-09-16)
Field: Materials Science — Polymers and Plastics

Synthesis, properties, and material hybridization of bare aromatic polymers enabled by dendrimer support Aromatic polymers are the first-choice platform for current organic materials due to their distinct optical, electronic, and mechanical properties as well as their biocompatibility. However, bare aromatic polymer backbones tend to strongly aggregate, rendering them essentially insoluble in organic solvent. While the typical solution is to install many solubilizing substituents on the backbones, this often provokes undesired property changes. Herein, we report the synthesis of bare aromatic polymers enabled by a dendrimer support. An initiator arene containing a diterpenoid-based dendrimer undergoes Pd-catalyzed polymerization with monomers bearing no solubilizing substituents to furnish bare aromatic polymers such as polythiophenes and poly(para-phenylene)s. The high solubility of dendrimer-ligated polymers allows not only the unveiling of the properties of unsubstituted π-conjugated backbone, but also mild release of dendrimer-free aromatic polymers and even transfer of aromatic polymers to other materials, such as silica gel and protein, which may accelerate the creation of hybrid materials nowadays challenging to access. Dendrimer ; Polymer ; Polymerization ; Monomer ; Conjugated system ; Polymer chemistry ; Materials science ; Solubility ; Copolymer ; Chemistry ; Organic chemistry Dendrimers and Hyperbranched Polymers ; Advanced Polymer Synthesis and Characterization ; Luminescence and Fluorescent Materials
Authors: D. N. Shurpik | Yulia I. Aleksandrova | Olga A. Mostovaya | Viktoriya A. Nazmutdinova | Regina E. Tazieva | Fadis F. Murzakhanov | Marat Gafurov | Pavel Zelenikhin | Evgenia V. Subakaeva | Е. А. Соколова | А. В. Герасимов | V. V. Gorodov | Daut R. Islamov | Peter J. Cragg | Ivan I. Stoikov
Source: Nanomaterials (article, 2022-05-09)
Field: Chemistry — Organic Chemistry

Self-Healing Thiolated Pillar[5]arene Films Containing Moxifloxacin Suppress the Development of Bacterial Biofilms Polymer self-healing films containing fragments of pillar[5]arene were obtained for the first time using thiol/disulfide redox cross-linking. These films were characterized by thermogravimetric analysis and differential scanning calorimetry, FTIR spectroscopy, and electron microscopy. The films demonstrated the ability to self-heal through the action of atmospheric oxygen. Using UV-vis, 2D 1H-1H NOESY, and DOSY NMR spectroscopy, the pillar[5]arene was shown to form complexes with the antimicrobial drug moxifloxacin in a 2:1 composition (logK11 = 2.14 and logK12 = 6.20). Films containing moxifloxacin effectively reduced <i>Staphylococcus aureus</i> and <i>Klebsiella pneumoniae</i> biofilms formation on adhesive surfaces. Thermogravimetric analysis ; Biofilm ; Moxifloxacin ; Pillar ; Differential scanning calorimetry ; Fourier transform infrared spectroscopy ; Nuclear chemistry ; Chemistry ; X-ray photoelectron spectroscopy ; Polymer chemistry ; Adhesion ; Materials science ; Scanning electron microscope ; Chemical engineering ; Organic chemistry ; Bacteria ; Biochemistry Supramolecular Chemistry and Complexes ; Luminescence and Fluorescent Materials ; Crystallography and molecular interactions
Authors: Eleonora E. Kim | Yuriy N. Kononevich | Yulia S. Dyuzhikova | Д. С. Ионов | Д. А. Ханин | Galina G. Nikiforova | Olga I. Shchegolikhina | В. Г. Васильев | Aziz M. Muzafarov
Source: Polymers (article, 2022-06-23)
Field: Materials Science — Materials Chemistry

Cross-Linked Luminescent Polymers Based on β-Diketone-Modified Polysiloxanes and Organoeuropiumsiloxanes Nowadays, luminescent materials attract wide attention due to their valuable characteristics and broad area of potential application. Luminescent silicone-based polymers possess unique properties, such as flexibility, hydrophobicity, thermal and chemical stabilities, etc., which allow them to be utilized in various fields, such as optoelectronics, solid-state lasers, luminescent solar concentrators, sensors, and others. In the present work, a metal-ligand interaction approach was applied to obtain new cross-linked luminescent polymers based on multiligand polysiloxanes with grafted <i>β</i>-diketone fragments and organoeuropiumsiloxanes containing various organic substituents. Organoeuropiumsiloxanes were utilized as a source of Eu<sup>3+</sup> ions due to their compatibility with the silicon matrix. All synthesized polymers were fully characterized and their physicochemical, mechanical, self-healing, optical, and thermal properties were studied. Luminescence ; Polymer ; Materials science ; Silicon ; Chemical engineering ; Nanotechnology ; Composite material ; Optoelectronics Silicone and Siloxane Chemistry ; Lanthanide and Transition Metal Complexes ; Polyoxometalates: Synthesis and Applications
Authors: Shan‐Li Wang | Lu Zhang | Mingyan Zhang | Licong Xu | Qian Hu | Tao Yang | Kaili Tu | Minghua Wu | Deyou Yu
Source: Water (article, 2022-06-10)
Field: Chemistry — Inorganic Chemistry

Enhanced Methylene Blue Adsorption by Cu-BTC Metal-Organic Frameworks with Engineered Particle Size Using Surfactant Modulators Metal–organic frameworks (MOFs) featuring porous structures and large specific surface areas have shown great potential in removing organic pollutants from wastewater via adsorption processes. Although the particle size of MOFs determines the adsorption performance (something known as the size-dependent effect), engineering it into desirable dimensions for enhancing the adsorption performance is a great challenge. Here, we develop a practical and facile approach to regulate the particle size of copper benzene-1,3,5-tricarboxylate (Cu-BTC) adsorbents with high tunability by screening the functional modulator of various surfactants adding in hydrothermal synthesis procedure. The effect of surfactant type and concentration on the particle size of Cu-BTC was systematically investigated. The results show that the nonionic surfactant polyvinylpyrrolidone (PVP) demonstrated the greatest ability to control the particle size of Cu-BTC among other counterparts (e.g., N, N, N-trimethyl-1-dodecanaminium bromide (DTAB), polyethylene glycol (PEG1000), sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS) and hexadecyl trimethyl ammonium bromide (CTAB)). By increasing the PVP concentration to 0.14 mmol L−1, the average particle size of Cu-BTC could be correspondingly reduced by more than ten times, reaching to a comparative smaller value of 2.4 μm as compared with the reported counterparts. In addition, the PVP allowed a large increase of the surface area of Cu-BTC according to porosity analysis, resulting in a great enhancement of methylene blue (MB) adsorption. The PVP-modulated Cu-BTC showed fast adsorption kinetics for MB removal accompanied with a maximum adsorption capacity of 169.2 mg g−1, which was considerably competitive with most of the analogs reported. Therefore, our study may inspire concepts for engineering the particle size of Cu-BTCs with improved properties for more practical applications. Adsorption ; Particle size ; Ammonium bromide ; Chemical engineering ; Pulmonary surfactant ; Inorganic chemistry ; Specific surface area ; Sodium dodecyl sulfate ; Polyethylene glycol ; Methylene blue ; Materials science ; Polyvinylpyrrolidone ; Bromide ; Chemistry ; Organic chemistry ; Polymer chemistry Metal-Organic Frameworks: Synthesis and Applications ; Adsorption and biosorption for pollutant removal ; Covalent Organic Framework Applications
Authors: Faniry Andriamiseza | Delphine Bordignon | Bruno Payré | Laurence Vaysse | Juliette Fitremann
Source: Journal of Colloid and Interface Science (article, 2022-02-23)
Field: Materials Science — Biomaterials

3D printing of biocompatible low molecular weight gels: Imbricated structures with sacrificial and persistent N-alkyl-d-galactonamides Self-healing hydrogels ; Alkyl ; Microstructure ; Solubility ; Chemical engineering ; Solvent ; Biocompatible material ; Materials science ; Polymer chemistry ; Chemistry ; Nanotechnology ; Organic chemistry ; Crystallography ; Biomedical engineering Supramolecular Self-Assembly in Materials ; 3D Printing in Biomedical Research ; Hydrogels: synthesis, properties, applications
Authors: Janne M. Naapuri | Noelia Losada‐Garcia | Robin Alexander Rothemann | Manuel Carmona Pichardo | Martin H. G. Prechtl | José M. Palomo | Jan Deska
Source: ChemCatChem (article, 2022-05-11)
Field: Chemistry — Inorganic Chemistry

Cascade Catalysis Through Bifunctional Lipase Metal Biohybrids for the Synthesis of Enantioenriched O‐Heterocycles from Allenes Lipase/metal nanobiohybrids, generated by growth of silver or gold nanoparticles on protein matrixes are used as highly effective dual-activity heterogeneous catalysts for the production of enantiomerically enriched 2,5-dihydrofurans from allenic acetates in a one-pot cascade process combining a lipase-mediated hydrolytic kinetic resolution with a metal-catalyzed allene cycloisomerization. Incorporating a novel strategy based on enzyme-polymer bioconjugates in the nanobiohybrid preparation enables excellent conversions in the process. <i>Candida antarctica</i> lipase B (CALB) in combination with a dextran-based polymer modifier (DexAsp) proved to be most efficient when merged with silver nanoparticles. A range of hybrid materials were produced, combining Ag or Au metals with <i>Thermomyces lanuginosus</i> lipase (TLL) or CALB and its DexAsp or polyethyleneimine polymer bioconjugates. The wider applicability of the biohybrids is demonstrated by their use in allenic alcohol cyclizations, where a variety of dihydrofurans are obtained using a CALB/gold nanomaterial. These results underline the potential of the nanobiohybrid catalysis as promising approach to intricate one-pot synthetic strategies. Bifunctional ; Chemistry ; Catalysis ; Cascade ; Lipase ; Enantioselective synthesis ; Organic chemistry ; Metal ; Combinatorial chemistry ; Stereochemistry ; Enzyme Asymmetric Hydrogenation and Catalysis ; Catalytic Alkyne Reactions ; Cyclopropane Reaction Mechanisms
Authors: Ayoub Daouli | Etienne Paul Hessou | Hubert Monnier | Marie-Antoinette Dziurla | A. Hasnaoui | Guillaume Maurin | Michaël Badawi
Source: Physical Chemistry Chemical Physics (article, 2022-01-01)
Field: Materials Science — Materials Chemistry

Adsorption of NO, NO<sub>2</sub> and H<sub>2</sub>O in divalent cation faujasite type zeolites: a density functional theory screening approach Emissions of diesel exhaust gas in confined work environments are a major health and safety concern, because of exposition to nitrogen oxides (NO<sub>x</sub>). Removal of these pollutants from exhaust gas calls for engineering of an optimum sorbent for the selective trapping of NO and NO<sub>2</sub> in the presence of water. To this end, periodic density functional theory calculations along with a recent dispersion correction scheme, namely the Tkatchenko-Scheffler scheme coupled with iterative Hirshfeld partitioning TS/HI, were performed to investigate the interactions between NO, NO<sub>2</sub>, H<sub>2</sub>O and a series of divalent cation (Be<sup>2+</sup>, Mg<sup>2+</sup>, Ca<sup>2+</sup>, Sr<sup>2+</sup>, Ba<sup>2+</sup>, Fe<sup>2+</sup>, Cu<sup>2+</sup>, Zn<sup>2+</sup>, Pd<sup>2+</sup>, and Pt<sup>2+</sup>) faujasites. This enabled the identification of the optimum zeolites to selectively capture NO<sub>x</sub> in the presence of H<sub>2</sub>O, with respect to two important criteria, such as thermodynamic affinity and regeneration. Our results revealed that Pt<sup>2+</sup> and Pd<sup>2+</sup> containing faujasites are the best candidates for effective capture of both NO and NO<sub>2</sub> molecules, which paves the way towards the use of these sorbents to address this challenging application. Sorbent ; Density functional theory ; Faujasite ; Chemistry ; Divalent ; Adsorption ; NOx ; Molecule ; Zeolite ; Inorganic chemistry ; Computational chemistry ; Physical chemistry ; Catalysis ; Organic chemistry Catalytic Processes in Materials Science ; Zeolite Catalysis and Synthesis ; Industrial Gas Emission Control
Authors: Shuvankar Dey | Anshu Kumar | Pradip Kumar Mondal | Deepak Chopra | Rupam Roy | Sana Jindani | Bishwajit Ganguly | Chaithra Mayya | Dhiraj Bhatia | V. K. Jain
Source: Scientific Reports (article, 2022-10-12)
Field: Chemistry — Spectroscopy

Ultrasensitive colorimetric detection of fluoride and arsenate in water and mammalian cells using recyclable metal oxacalixarene probe: a lateral flow assay Globally 3 billion people are consuming water with moderately high concentrations of fluoride and arsenic. The development of a simple point of care (PoC) device or home device for the detection of fluoride/arsenic ensures safety before consuming water. Till date, lateral flow assay (LFA) based PoC devices can detect nucleic acids, viruses and diseases. An aluminium complex of rhodamine B functionalized oxacalix[4]arene (L) was designed to execute the LFA-based PoC device. Initially, Al<sup>3+</sup> and Fe<sup>3+</sup> ions were involved in complexation with the rhodamine B functionalized oxacalix[4]arene (L), resulting C<sub>1</sub> (L-Al<sup>3+</sup>) and C<sub>2</sub> (L-Fe<sup>3+</sup>) complexes respectively. The receptor L, as well as the probes (C<sub>1</sub>, C<sub>2</sub>), were characterized thoroughly using mass spectroscopy, FTIR, NMR, and EA. C<sub>1</sub> and C<sub>2</sub> were further utilized as recyclable probes for the detection of aqueous fluoride (21 ppb) and arsenate (1.92 ppb) respectively. The computational calculation indicates that upon complexation, the spirolactam ring opening at the rhodamine B site leads to optoelectronic changes. The consistency of LFA-based portable sensing device has been tested with water samples, synthetic fluoride standards and dental care products like toothpaste and mouthwash with concentrations ≥ 3 ppm. Moreover, fixed cell imaging experiments were performed to ascertain the in-vitro sensing phenomena. Arsenate ; Fluoride ; Metal ; Chemistry ; Arsenic ; Inorganic chemistry ; Organic chemistry Molecular Sensors and Ion Detection ; Advanced biosensing and bioanalysis techniques ; Fluoride Effects and Removal
Authors: Rukmava Chatterjee | Umesh Chaudhari | Sushant Anand
Source: Advanced Functional Materials (article, 2022-11-20)
Field: Materials Science — Surfaces, Coatings and Films

How to Select Phase Change Materials for Tuning Condensation and Frosting? Abstract Synthetic surfaces engineered to regulate phase transitions of matter and exercise control over its undesired accrual (liquid or solid) play a pivotal role in diverse industrial applications. Over the years, the design of repellant surfaces has transitioned from solely modifying the surface texture and chemistry to identifying novel material systems. In this study, selection criteria are established to identify bio‐friendly phase change materials (PCMs) from an extensive library of vegetable‐based/organic/essential oils that can thermally respond by harnessing the latent heat released during condensation and thereby delaying ice/frost formation in the very frigid ambient that is detrimental to its functionality. Concurrently, a comprehensive investigation is conducted to elucidate the relation between microscale heat transport phenomena during condensation and the resulting macroscopic effects (e.g., delayed droplet freezing) on various solidified PCMs as a function of their inherent thermo‐mechanical properties. In addition, to freeze protection, many properties that are responsive to the thermal reflex of the surface, such as the ability to dynamically tune optical transparency, moisture harvesting, ice shedding, and quick in‐field repairability, are achievable, resulting in the development of protective coatings capable of spanning a wide range of functionalities and thereby having a distinctive edge over conventional solutions. Materials science ; Microscale chemistry ; Condensation ; Nanotechnology ; Phase (matter) ; Material Design ; Phase change ; Moisture ; Phase transition ; Process engineering ; Composite material ; Engineering physics ; Thermodynamics Surface Modification and Superhydrophobicity ; Nanomaterials and Printing Technologies ; Fluid Dynamics and Heat Transfer