56,278 results match your criteria hydrophobic hydrophilic

Gradient Heating Effect Modulated by Hydrophobic/Hydrophilic Carbon Nanotube Network Structures for Ultrafast Solar Steam Generation.

ACS Appl Mater Interfaces 2021 Apr 14. Epub 2021 Apr 14.

School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230000, China.

The emerging interface solar-thermal water evaporation has been widely studied to solve fresh water shortage because of its high solar-thermal conversion efficiency, environmental friendliness, and low cost. However, traditional water evaporation systems inevitably lose heat to the environment, which not only greatly affects the water evaporation rate but also hinders their practical applications. In this work, an interface solar-thermal water evaporation system with enhanced heat localization, which is combined by a hydrophobic carbon nanotube (CNT) film (heating layer) and hydrophilic polyvinyl alcohol (PVA)/CNT foam (evaporating layer), is demonstrated. Read More

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Dewetting dynamics of heavy crude oil droplet in low-salinity fluids at elevated pressures and temperatures.

J Colloid Interface Sci 2021 Mar 26;596:420-430. Epub 2021 Mar 26.

School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom. Electronic address:

Hypothesis: Improved oil recovery by low-salinity injection correlates to the optimal brine concentration to achieve maximum dewetting of oil droplets on rock surfaces. While interfacial tension and electrical double layer forces are often cited as being determinant properties, we hypothesize that other structural/interfacial forces are more prominent in governing the system behavior.

Experiments: The sessile droplet technique was used to study the receding dynamics of oil droplets from flat hydrophilic substrates in brines of different salt type (NaCl and CaCl) and concentration, and were studied at both low and elevated temperatures (60 and 140 °C) and pressures (1, 10, 100 and 200 bar). Read More

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Wetting Dynamics of a Lipid Monolayer.

Langmuir 2021 Apr 13. Epub 2021 Apr 13.

Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Direct measurement and control of the dynamic wetting properties of a lipid-coated water-air interface over a wide range of surface tension variations have many important applications. However, the wetting dynamics of the interface near its partial-to-complete wetting transition has not been fully understood. Here, we report a systematic study of the wetting dynamics of a lipid-coated water-air interface around a thin glass fiber of diameter 1-5 μm and length 100-300 μm. Read More

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Modulation of the Protein-Ligand Interaction in the Presence of Graphene Oxide: a Detailed Spectroscopic Study.

Langmuir 2021 Apr 13. Epub 2021 Apr 13.

Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801103, India.

Several applications of graphene oxide (GO) have been established over the years, and it has the potential to be used as a biomedical material. Studying the effect of GO on protein-ligand (small molecules/drugs) complex systems are vital as the mechanisms involved are not well understood. The interaction of GO on the protein-ligand binding is also vital for the preparation of an effective drug carrier in the bloodstream. Read More

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Structural basis for an exceptionally strong preference for asparagine residue at the S2 subsite of Stenotrophomonas maltophilia dipeptidyl peptidase 7.

Sci Rep 2021 Apr 12;11(1):7929. Epub 2021 Apr 12.

Department of Science of Technology Innovation, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, 940-2188, Japan.

The emergence of drug-resistant bacteria has become a major problem worldwide. Bacterial dipeptidyl peptidases 7 and 11 (DPP7s and DPP11s), belonging to the family-S46 peptidases, are important enzymes for bacterial growth and are not present in mammals. Therefore, specific inhibitors for these peptidases are promising as potential antibiotics. Read More

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Application of Bacterial Nanocellulose in the Cancer Drug Delivery: A Review.

Curr Pharm Des 2021 Apr 12. Epub 2021 Apr 12.

Cellular and Molecular Endocrine Research Center, Research Institute of Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran. Iran.

Bacterial nanocellulose (BNC) is one of the natural biopolymers with unique features, the most important of which are nontoxicity, biocompatibility, high tensile profile, nanofiber structure, and purity. The current review aimed to summarize the latest development in BNC-based biomaterials in cancer drug delivery. The original articles were found by searching key databases including PubMed, Scopus, and Web of Scientific and using key terms such as "bacterial nanocellulose OR bacterial cellulose OR BNC" AND "cancer OR carcinoma OR tumor". Read More

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Insights into Regional Wetting Behaviors of Amphiphilic Collagen for Dual Separation of Emulsions.

ACS Appl Mater Interfaces 2021 Apr 12. Epub 2021 Apr 12.

National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu 610065, P. R. China.

Industrial manufacture generates a huge quantity of emulsion wastewater, which causes serious threats to the aquatic ecosystems. Water-in-oil (W/O) and oil-in-water (O/W) emulsions are two major types of emulsions discharged by industries. However, dual separation of W/O and O/W emulsions remains a challenging issue due to the contradictory permselectivity for separating the two emulsions. Read More

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Interaction energy between neuronal cell receptors and peptoid ligands.

J Biomech 2021 Mar 15;121:110381. Epub 2021 Mar 15.

Multiscale Materials Modeling Lab, Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR, USA; Institute for Nanoscience and Engineering, 731 W. Dickson Street, University of Arkansas, Fayetteville, AR, USA. Electronic address:

Peptoids as an extracellular matrix (ECM) material is gaining importance in in vitro neuronal cell culture studies due to their biocompatibility, self-assembling structure, and stability. Mechanotransduction between a neuronal cell and an ECM is mediated by neuronal cell receptors such as integrin and neural cellular adhesion molecule. In this study, using molecular dynamics, we investigate the interaction energies between peptoid and neuronal cell receptors, and also study the effect of peptoid bundle size. Read More

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Hydrophobic POM Electrocatalyst Achieves Low Voltage "Charge" in Zn-air Battery Coupled with Bisphenol A Degradation.

Chemistry 2021 Apr 12. Epub 2021 Apr 12.

inorganic institution, chemistry department, CHINA.

Zn-air battery is a perspective power source for grid-storage. But, after they are discharged at 1.1 to 1. Read More

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Crystal structures of zinc(II) complexes with β-hydroxypyridinecarboxylate ligands: examples of structure-directing effects used in inorganic crystal engineering.

Acta Crystallogr B Struct Sci Cryst Eng Mater 2021 Apr 27;77(Pt 2):193-204. Epub 2021 Feb 27.

Centre for Structural Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest, H-1117, Hungary.

The coordination properties of four hydroxypyridinecarboxylates, designed for the treatment of iron-overloading conditions as bidentate O,O'-donor ligands, have been studied with Zn in the solid state. The coordination compounds [Zn(A1)(HO)] (1), [Zn(A2)(HO)] (2), [Zn(A3)(HO)]·2HO (3) and [Zn(B1)(HO)]·4HO (4), where the ligands are 1-methyl-4-oxidopyridinium-3-carboxylate (A1, CHNO), 1,6-dimethyl-4-oxidopyridinium-3-carboxylate (A2, CHNO), 1,5-dimethyl-4-oxido-pyridinium-3-carboxylate (A3, CHNO) and 1-methyl-3-oxidopyridinium-4-carboxylate (B1, CHNO), have been synthesized and analysed by single-crystal X-ray diffraction. The ligands were chosen to probe (i) the electronic effects of inverting the positions of the O-atom donor groups (i. Read More

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Bioconversion of waste acid oil to docosahexaenoic acid by integration of "ex novo'' and "de novo'' fermentation in Aurantiochytrium limacinum.

Bioresour Technol 2021 Mar 27;332:125062. Epub 2021 Mar 27.

DBT-ICT Centre for Energy Biosciences, Institute of Chemical Technology, Mumbai, India. Electronic address:

Thraustochytrids have predominantly been grown on hydrophilic substrates i.e. by "de novo" fermentation. Read More

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Amphiphilic polymers for aggregation-induced emission at air/liquid interfaces.

J Colloid Interface Sci 2021 Mar 16;596:324-331. Epub 2021 Mar 16.

Departamento de Química Física y T. Aplicada, Instituto Universitario de Nanoquímica IUNAN, Facultad de Ciencias, Universidad de Córdoba (UCO), Campus de Rabanales, Ed. Marie Curie, E-14071 Córdoba, Spain. Electronic address:

Polymersomes and related self-assembled nanostructures displaying Aggregation-Induced Emission (AIE) are highly relevant for plenty of applications in imaging, biology and functional devices. Experimentally simple, scalable and universal strategies for on-demand self-assembly of polymers rendering well-defined nanostructures are highly desirable. A purposefully designed combination of amphiphilic block copolymers including tunable lengths of hydrophilic polyethylene glycol (PEG) and hydrophobic AIE polymer poly(tetraphenylethylene-trimethylenecarbonate) (P(TPE-TMC)) has been studied at the air/liquid interface. Read More

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Recent advances and applications of cyclodextrins in magnetic solid phase extraction.

Talanta 2021 Jul 17;229:122296. Epub 2021 Mar 17.

Department of Analytical Chemistry and Pollutants, Shahid Beheshti University, G. C., P.O. Box 519396-4716, Evin, Tehran, Iran. Electronic address:

Cyclodextrins (CDs) as a family of cyclic oligosaccharides are toroidal with a hydrophobic interior and a hydrophilic exterior. They are well-known for their ability to form host-guest inclusion complexes with different compounds. They are used as chiral stationary phases in high performance liquid chromatography (HPLC) and gas chromatography (GC) or as chiral reagents in the background electrolyte of capillary electrophoresis (CE). Read More

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Exposure to DMSO during infancy alters neurochemistry, social interactions, and brain morphology in long-evans rats.

Brain Behav 2021 Apr 10:e02146. Epub 2021 Apr 10.

Department of Pathology and Laboratory Medicine, School of Medicine, University of California Davis, Sacramento, CA, USA.

Introduction: Dimethyl sulfoxide (DMSO) is a widely used solvent to dissolve hydrophobic substances for clinical uses and experimental in vivo purposes. While usually regarded safe, our prior studies suggest changes to behavior following DMSO exposure. We therefore evaluated the effects of a five-day, short-term exposure to DMSO on postnatal infant rats (P6-10). Read More

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Thermodynamic Decomposition of Solvation Free Energies with Particle Mesh Ewald and Long-Range Lennard-Jones Interactions in Grid Inhomogeneous Solvation Theory.

J Chem Theory Comput 2021 Apr 8. Epub 2021 Apr 8.

Department of Chemistry, Lehman College, The City University of New York, 250 Bedford Park Boulevard West, Bronx, New York 10468, United States.

Grid Inhomogeneous Solvation Theory (GIST) maps out solvation thermodynamic properties on a fine meshed grid and provides a statistical mechanical formalism for thermodynamic end-state calculations. However, differences in how long-range nonbonded interactions are calculated in molecular dynamics engines and in the current implementation of GIST have prevented precise comparisons between free energies estimated using GIST and those from other free energy methods such as thermodynamic integration (TI). Here, we address this by presenting PME-GIST, a formalism by which particle mesh Ewald (PME)-based electrostatic energies and long-range Lennard-Jones (LJ) energies are decomposed and assigned to individual atoms and the corresponding voxels they occupy in a manner consistent with the GIST approach. Read More

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Effect of Polymer Hydrophilicity and Molar Mass on the Properties of the Protein in Protein-Polymer Conjugates: The Case of PPEylated Myoglobin.

Biomacromolecules 2021 Apr 8. Epub 2021 Apr 8.

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi, Pisa 56124, Italy.

Polyphosphoesters (PPEs), a versatile class of biodegradable and biocompatible polymers, have been proposed as alternatives to poly(ethylene glycol) (PEG), which is suspected to be responsible for anaphylactic reactions in some patients after the administration of PEGylated compounds, e.g., in the current Covid-19 vaccines. Read More

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Library Creation of Ultrasmall Multi-metallic Nanoparticles Confined in Mesoporous MFI Zeolites.

Angew Chem Int Ed Engl 2021 Apr 7. Epub 2021 Apr 7.

Shanghai JiaoTong University, School of Chemistry and Chemical Engineering, 800 Dongchuan Road, 200240, Shanghai, CHINA.

The development of materials integrated with ultrasmall multi-metal nanoparticles (UMMNs) and mesoporous zeolite is a considerable challenge in chemistry and materials science. We designed trifunctional surfactant, in which the pyridyl benzimidazole in the hydrophobic tail generates the mesopores through π-π stacking; the diquaternary ammonium in the hydrophilic headgroup direct the formation of MFI zeolite sheets and the nitrogen atoms in heterocyclic ringscoordinate with various metal ions to form UMMNs confined in the zeolite matrix after calcination and reduction. A library of 56 UMMNs confined within both micropores and mesopores of MFI zeolites (MMZs) with 4 mono-, 14 bi- and 38 tri-metallic nanoparticles (sizes of 1. Read More

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Directly Patterning Conductive Polymer Electrodes on Organic Semiconductor via In Situ Polymerization in Microchannels for High-Performance Organic Transistors.

ACS Appl Mater Interfaces 2021 Apr 7. Epub 2021 Apr 7.

Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, 300072 Tianjin, China.

Conductive polymers are considered promising electrode materials for organic transistors, but the reported devices with conductive polymer electrodes generally suffer from considerable contact resistance. Currently, it is still highly challenging to pattern conductive polymer electrodes on organic semiconductor surfaces with good structure and interface quality. Herein, we develop an in situ polymerization strategy to directly pattern the top-contacted polypyrrole (PPy) electrodes on hydrophobic surfaces of organic semiconductors by microchannel templates, which is also applicable on diverse hydrophobic and hydrophilic surfaces. Read More

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Janus graphite felt cathode dramatically enhance the H2O2 yield from O2 electroreduction by the hydrophilicity-hydrophobicity regulation.

Chemosphere 2021 Mar 30;278:130382. Epub 2021 Mar 30.

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China.

Hydrogen peroxide (HO) electrosynthesis from 2-electron O reduction reaction (2eORR) is widely regarded as a promising alternative to the current industry-dominant anthraquinone process. Design and fabrication of effective, low-cost carbon-based electrodes is one of the priorities. Many previous work well confirmed that hydrophilic carbon-based electrodes are preferable for 2eORR. Read More

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Reduced Biofilm Formation at the Air-Liquid-Solid Interface via Introduction of Surfactants.

ACS Biomater Sci Eng 2021 Apr 6. Epub 2021 Apr 6.

Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States.

Reduced biofilm formation is highly desirable in applications ranging from transportation to separations and healthcare. Biofilms often form at the three-phase interface where air, liquid, and solid coexist due to the close proximity to nutrients and oxygen. Reducing biofilm formation at the triple interface presents challenges because of the conflicting requirements for hydrophobicity at the air-solid interface (for self-cleaning properties) and for hydrophilicity at the liquid-solid interface (for reduced foulant adhesion). Read More

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Investigation on conformational variation and activity of trypsin affected by black phosphorus quantum dots via multi-spectroscopy and molecular modeling.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Mar 26;256:119746. Epub 2021 Mar 26.

Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, College of Chemistry and Materials, Nanning Normal University, Nanning 530001, PR China. Electronic address:

Binding interaction between black phosphorus quantum dots (BPQDs) and trypsin was researched deeply to illustrate the variations on conformation and activity of trypsin affected by BPQDs via multi-spectroscopy and molecular modeling. Experimental results implied that inherent fluorescence of trypsin was quenched by BPQDs via static fluorescence quenching mode. BPQDs bound with trypsin to construct ground-state complex under the binding forces of van der Waal interaction and hydrophobic interaction, resulting in the conformational change of trypsin to be more hydrophilic and incompact. Read More

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Micellization of Sequence-Controlled Polyurethane Ionomers in Mixed Aqueous Solvents.

Macromolecules 2021 Mar 25;54(5):2376-2382. Epub 2021 Feb 25.

Laboratory of Self-Organizing Soft Matter, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands.

While the impact of compositional parameters such as block length and ionic content on the micellization of (polymeric) amphiphiles is widely investigated, the influence of monomer sequence has received far less attention until recently. Here, we report the synthesis of two sequence-controlled polyurethane ionomers (PUIs) prepared via a stepwise coupling-deprotection strategy, and compare their solution association in aqueous-organic mixtures. The two PUIs are highly similar in mass and overall composition, yet differ markedly in the sequence of building blocks. Read More

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Separation and characterization of refractory colored dissolved effluent organic matter in a full-scale industrial park wastewater treatment plant.

Environ Sci Pollut Res Int 2021 Apr 4. Epub 2021 Apr 4.

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.

Colored dissolved organic matter (DOM) is a significant indicator of refractory DOM in wastewaters, and fluorescent DOM is an essential part indicating colorants. However, little is known about the composition and contribution of colored DOM to wastewater. This study provided some insights on the persistent yellowish color in biological effluent through use of a multi-characterization approach, and evaluated the effect of two advanced treatments (O and granular active carbon (GAC)) in a full-scale wastewater treatment plant. Read More

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Polyethyleneimine-functionalized FeO/attapulgite particles for hydrophilic interaction-based magnetic dispersive solid-phase extraction of fluoroquinolones in chicken muscle.

Anal Bioanal Chem 2021 Apr 4. Epub 2021 Apr 4.

Key Laboratory of Separation Science for Analytical Chemistry, National Chromatographic Research and Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.

Fluoroquinolone (FQ) residues in foods of animal origin may threaten public health but are challenging to determine because of their low contents and complex matrices. In this study, novel polyethyleneimine-functionalized FeO/attapulgite magnetic particles were prepared by a simple co-mixing method and applied as hydrophilic sorbents for the magnetic dispersive solid-phase extraction (MSPE) of three FQs, i.e. Read More

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A novel optical biosensor for in situ and small-scale monitoring of bacterial transport in saturated columns.

J Environ Manage 2021 Apr 1;289:112452. Epub 2021 Apr 1.

Department of Molecular Medicine and Pathology, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand.

In situ monitoring techniques can provide new insight into bacterial transport after inoculating exogenous bacteria into contaminated soils for bioremediation. A real-time and non-destructive optical sensor (the optrode) was employed to monitor in situ transport of two fluorescently labelled bacteria - Green Fluorescent Protein (Gfp)-labelled, hydrophilic Pseudomonas putida and Tomato Fluorescent Protein (td)-labelled, hydrophobic Rhodococcus erythropolis, in a saturated sand column with and without rhamnolipid surfactant. In situ measurements were made at three sampling ports in the column with the optrode in two sets of column experiments. Read More

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An asymmetric electrospun membrane for the controlled release of ciprofloxacin and FGF-2: Evaluation of antimicrobial and chemoattractant properties.

Mater Sci Eng C Mater Biol Appl 2021 Apr 27;123:112001. Epub 2021 Feb 27.

Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, 90123 Palermo, Italy; Institute of Biophysics at Palermo, Italian National Research Council, Via Ugo La Malfa 153, 90146 Palermo, Italy.

Here, an asymmetric double-layer membrane has been designed and fabricated by electrospinning as a tool for a potential wound healing application. A hydrophobic layer has been produced by using a polyurethane-polycaprolactone (PU-PCL) copolymer and loaded with the antibacterial ciprofloxacin whereas an ion responsive hydrophilic layer has been produced by using an octyl derivative of gellan gum (GG-C) and polyvinyl alcohol (PVA) and loaded with the growth factor FGF-2. This study investigated how the properties of this asymmetric membrane loaded with actives, were influenced by the ionotropic crosslinking of the hydrophilic layer. Read More

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Small Molecule and Macrocyclic Pyrazole Derived Inhibitors of Myeloperoxidase (MPO).

Bioorg Med Chem Lett 2021 Mar 31:128010. Epub 2021 Mar 31.

Research and Development, Bristol-Myers Squibb Company, P. O. Box 5400, Princeton, NJ 08543 USA.

Myeloperoxidase (MPO), a critical enzyme in antimicrobial host-defense, has been implicated in chronic inflammatory diseases such as coronary artery disease. The design and evaluation of MPO inhibitors for the treatment of cardiovascular disease is reported herein. Starting with the MPO and triazolopyridine 3 crystal structure, novel inhibitors were designed incorporating a substituted pyrazole, which allowed for substituents to interact with hydrophobic and hydrophilic patches in the active site. Read More

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Biodegradable and Biocompatible Silatrane Polymers.

Molecules 2021 Mar 26;26(7). Epub 2021 Mar 26.

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russia.

In this study, new biodegradable and biocompatible amphiphilic polymers were obtained by modifying the peripheral hydroxyl groups of branched polyethers and polyesters with organosilicon substituents. The structures of the synthesized polymers were confirmed by NMR and GPC. Organosilicon moieties of the polymers were formed by silatranes and trimethylsilyl blocks and displayed hydrophilic and hydrophobic properties, respectively. Read More

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When Albumin Meets Liposomes: A Feasible Drug Carrier for Biomedical Applications.

Pharmaceuticals (Basel) 2021 Mar 26;14(4). Epub 2021 Mar 26.

School of Pharmacy and Biomedical Sciences, Curtin University, Perth, WA 6102, Australia.

Albumin, the most abundant protein in plasma, possesses some inherent beneficial structural and physiological characteristics that make it suitable for use as a drug delivery agent, such as an extraordinary drug-binding capacity and long blood retention, with a high biocompatibility. The use of these characteristics as a nanoparticle drug delivery system (DDS) offers several advantages, including a longer circulation time, lower toxicity, and more significant drug loading. To date, many innovative liposome preparations have been developed in which albumin is involved as a DDS. Read More

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Hydrophilic Cross-Linked Aliphatic Hydrocarbon Diblock Copolymer as Proton Exchange Membrane for Fuel Cells.

Materials (Basel) 2021 Mar 26;14(7). Epub 2021 Mar 26.

Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 117585, Singapore.

This study proposes a hydrophobic and hydrophilic aliphatic diblock copolymer wherein the hydrophobic block contains glycidyl methacrylate (GMA) units that are distanced by poly(acrylonitrile) (PAN) segments to fabricate a proton exchange membrane (PEM). This diblock copolymer also known as ionomer due to the hydrophilic block comprising 3-sulfopropyl methacrylate potassium salt (SPM) block. The diblock copolymer was synthesized in the one-pot atom transfer radical polymerization (ATRP) synthesis. Read More

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