334 results match your criteria compositions tuned

Compressibility of Multicomponent, Charged Model Biomembranes Tunes Permeation of Cationic Nanoparticles.

Langmuir 2021 03 22;37(12):3550-3562. Epub 2021 Mar 22.

Department of Physics, Indian Institute of Science, Bangalore 560012, India.

Cells respond to external stress by altering their membrane lipid composition to maintain fluidity, integrity and net charge. However, in interactions with charged nanoparticles (NPs), altering membrane charge could adversely affect its ability to transport ions across the cell membrane. Hence, it is important to understand possible pathways by which cells could alter zwitterionic lipid composition to respond to NPs without compromising membrane integrity and charge. Read More

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Red-Emitting, Acene-Doped Conjugated Polymer Nanoparticles that Respond Ratiometrically to Photogenerated O.

ACS Appl Mater Interfaces 2021 Mar 11;13(11):13658-13665. Epub 2021 Mar 11.

Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States.

Fluorophores that respond to external stimuli on demand have numerous applications in imaging and chemical or biological sensing. In this paper, we describe conjugated polymer nanoparticles (CPNs) that comprise a donor polymer matrix and a red-fluorescent, singlet oxygen-reactive heteroacene dopant () that display a ratiometric response upon photo-oxidation. This ratiometric response can be tuned by the level of doping of , the identity of the conjugated polymer matrix used, and the blending of two conjugated polymers together to access red-shifted emission wavelengths. Read More

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A New Meal Absorption Model for Artificial Pancreas Systems.

J Diabetes Sci Technol 2021 Feb 28:1932296821990111. Epub 2021 Feb 28.

Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.

Background: Artificial pancreas (AP) systems reduce the treatment burden of Type 1 Diabetes by automatically regulating blood glucose (BG) levels. While many disturbances stand in the way of fully closed-loop (automated) control, unannounced meals remain the greatest challenge. Furthermore, different types of meals can have significantly different glucose responses, further increasing the uncertainty surrounding the meal. Read More

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February 2021

Preparation of CdS Se -MoS Heterostructures via Cation Exchange of Pre-Epitaxially Synthesized Cu S Se -MoS for Photocatalytic Hydrogen Evolution.

Small 2021 Mar 19;17(11):e2006135. Epub 2021 Feb 19.

Department of Chemistry, City University of Hong Kong, Hong Kong, China.

Construction of 2D transition metal dichalcogenide (TMD)-based epitaxial heterostructures with different compositions is important for various promising applications, including electronics, photonics, and catalysis. However, the rational design and controlled synthesis of such kind of heterostructures still remain challenge, especially for those consisting of layered TMDs and other non-layered materials. Here, a facile one-pot, wet-chemical method is reported to synthesize Cu S Se -MoS heterostructures in which two types of different epitaxial configurations, i. Read More

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PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties.

Nanomaterials (Basel) 2021 Jan 29;11(2). Epub 2021 Jan 29.

Department of Chemistry, Zhejiang University, Hangzhou 310058, China.

The functions of heterogeneous metallic nanocrystals (HMNCs) can be undoubtedly tuned by controlling their morphologies and compositions. As a less-studied kind of HMNCs, corner-satellite multi-metallic nanocrystals (CSMNCs) have great research value in structure-related electrocatalytic performance. In this work, PdAgPt corner-satellite nanocrystals with well-controlled morphologies and compositions have been developed by temperature regulation of a seed-mediated growth process. Read More

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January 2021

Block copolymers based on poly(butylene adipate) and poly(L-lactic acid) for biomedical applications: synthesis, structure and thermodynamical studies.

Soft Matter 2021 Mar;17(9):2439-2453

Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece and Department of Physics, National Technical University of Athens (NTUA), Zografou Campus, 15780, Athens, Greece.

This work describes the synthesis of poly(butylene adipate) (PBAd), by melt polycondensation, poly(l-lactic acid) (PLLA), by ring opening polymerization, and the new block copolymer PLLA/PBAd in ratios 90/10, 95/5, 75/25 and 50/50. Due to the biocompatibility and low toxicity of neat PBAd and PLLA, these copolymers are suitable to be used in biomedical applications. The 1H and 13C nuclear magnetic resonance spectroscopy techniques were employed for structural characterization. Read More

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Interplay between cofactors and transcription factors in hematopoiesis and hematological malignancies.

Signal Transduct Target Ther 2021 Jan 20;6(1):24. Epub 2021 Jan 20.

Molecular Biology Research Center and Hunan Province Key Laboratory of Basic and Applied Hematology, School of Life Sciences, Central South University, 410078, Changsha, Hunan, China.

Hematopoiesis requires finely tuned regulation of gene expression at each stage of development. The regulation of gene transcription involves not only individual transcription factors (TFs) but also transcription complexes (TCs) composed of transcription factor(s) and multisubunit cofactors. In their normal compositions, TCs orchestrate lineage-specific patterns of gene expression and ensure the production of the correct proportions of individual cell lineages during hematopoiesis. Read More

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January 2021

Alteration of Microstructure in Biopolymeric Hydrogels Compositional Modification of Resilin-Like Polypeptides.

ACS Biomater Sci Eng 2021 Jan 19. Epub 2021 Jan 19.

Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States.

Heterogeneities in hydrogel scaffolds are known to impact the performance of cells in cell-laden materials constructs, and we have employed the phase separation of resilin-like polypeptides (RLPs) as a means to generate such materials. Here, we study the compositional features of resilin-like polypeptides (RLPs) that further enable our control of their liquid-liquid phase separation (LLPS) and how such control impacts the formation of microstructured hydrogels. The evaluation of the phase separation of RLPs in solutions of ammonium sulfate offers insights into the sequence-dependent LLPS of the RLP solutions, and atomistic simulations, along with 2D-nuclear Overhauser effect spectroscopy (NOESY) and correlated spectroscopy (COSY) H NMR, suggest specific amino acid interactions that may mediate this phase behavior. Read More

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January 2021

Morphology Controlled Synthesis of Composition Related Plasmonic CuCdS Alloy Nanocrystals.

Front Chem 2020 23;8:628536. Epub 2020 Dec 23.

Key Lab for Special Functional Materials, Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng, China.

Cu-based ternary alloy nanocrystals have emerged for extensive applications in solar cells, light-emitting devices (LEDs), and photoelectric detectors because of their low-toxicity, tunable band gaps, and large absorption coefficients. It is still an enormous challenge that regulating optical and electrical properties through changing their compositions and shapes in alloy nanocrystals. Herein, we present a facile method to synthesize CuCdS alloy nanocrystals (NCs) with tunable compositions and shapes at relatively low temperature. Read More

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December 2020

Hidden complexity in membrane permeabilization behavior of antimicrobial polycations.

Phys Chem Chem Phys 2021 Jan;23(2):1475-1488

Chemistry and Pharmacy, Albert-Ludwigs-Universität, 79104 Freiburg i.Br., Germany.

A promising alternative to classical antibiotics are antimicrobial peptides and their synthetic mimics (smAMPs) that supposedly act directly on membranes. For a more successful design of smAMPs, we need to know how the type of interaction with the membrane determines the type of membrane perturbation. How this, in turn, transfers into selectivity and microbial killing activity is largely unknown. Read More

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January 2021

3D Printing of Biocompatible Shape-Memory Double Network Hydrogels.

ACS Appl Mater Interfaces 2021 Mar 18;13(11):12726-12734. Epub 2020 Dec 18.

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Shape-memory hydrogels can be fixed to an arbitrary temporary shape and recover their permanent shape under appropriate stimulus conditions. Their shape-memory behavior and biocompatible mechanical and chemical properties impart them with many biomedical applications. However, like most hydrogels, traditional shape-memory hydrogels suffer from intrinsic brittleness due to the network inhomogeneity and high water content. Read More

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Vanadium-Enhanced Intramolecular Redox Property of a Transition-Metal Oxide Molecular Wire.

Inorg Chem 2020 Nov 25;59(22):16557-16566. Epub 2020 Oct 25.

Faculty of Engineering, Kanagawa University, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.

Transition-metal oxide molecular wires are inorganic 1D polymers with elemental diversity. The properties of the materials are tuned by tuning the chemical compositions. The phosphovanadomolybdate molecular wire is synthesized, which is an isostructural material of the phosphomolybdate molecular wire. Read More

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November 2020

Advanced electrocatalysts based on two-dimensional transition metal hydroxides and their composites for alkaline oxygen reduction reaction.

Nanoscale 2020 Nov;12(42):21479-21496

World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.

The electrocatalytic oxygen reduction reaction (ORR) is a crucial part in developing high-efficiency fuel cells and metal-air batteries, which have been cherished as clean and sustainable energy conversion devices/systems to meet the ever-increasing energy demand. ORR electrocatalysts currently employed in the cathodes of fuel cells and metal-air batteries are mainly based on high-cost and scarce noble metal elements. It is thus of great importance to develop cheap and earth-abundant ORR electrocatalysts. Read More

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November 2020

A first step towards computational design of W-containing self-healing ferritic creep resistant steels.

Sci Technol Adv Mater 2020 Sep 14;21(1):641-652. Epub 2020 Sep 14.

Novel Aerospace Materials Group, Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands.

In this work, we combine a generic alloy-by-design model with a novel concept, the nucleation barrier for the formation of Laves phase to fill the creep cavities, in order to develop multi-component creep resistant steels with kinetically tuned self-healing behaviour. In the model the high-temperature long-term strength is estimated by integrating precipitation strengthening due to M23C6 carbides and solid solution strengthening, while the optimized compositional solutions are determined by employing the coupled thermodynamic and kinetic principles. W-containing Laves phase herein is selected as the self-healing agent to autonomously fill the grain boundary cavities, so as to prolong the creep lifetime. Read More

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September 2020

One Structure, Two Elements-LuGe Superconductor vs Ordinary Metallic Conductor LuSn. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution.

Inorg Chem 2020 Dec 24;59(23):16853-16864. Epub 2020 Sep 24.

Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.

The substitution of chemically similar elements in a given crystal structure is an effective way to enhance physical properties, but the understanding on such improvements is usually impeded because the substitutions are random, and the roles of the different atoms cannot be distinguished by crystallographic symmetry. Herein, we provide a detailed crystallographic analysis and property measurements for the continuous solid solutions LuGeSn (0 < < 2). The results show that there is no apparent change of the global symmetry, with the end-members LuGe and LuSn, as well as the intermediate LuGeSn compositions adopting the ZrSi type structure (space group , Pearson index 12). Read More

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December 2020

Lyotropic liquid crystal phase behavior of a cationic amphiphile in aqueous and non-stoichiometric protic ionic liquid mixtures.

Soft Matter 2020 Oct;16(41):9456-9470

School of Science, College of Science, Engineering and Health, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia.

Protic ionic liquids (PILs) are the largest and most tailorable known class of non-aqueous solvents which possess the ability to support amphiphile self-assembly. However, little is known about the effect of solvent additives on this ability. In this study, the lyotropic liquid crystal phase (LLCP) behavior of the cationic surfactant cetyltrimethylammonium bromide (CTAB) was investigated in the model PILs of ethylammonium nitrate (EAN) and ethanolammonium nitrate (EtAN), and derived multi-component solvent systems containing them to determine phase formation and diversity with changing solvent composition. Read More

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October 2020

Production, properties, and catalytic applications of sludge derived biochar for environmental remediation.

Water Res 2020 Dec 5;187:116390. Epub 2020 Sep 5.

State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address:

Environment-friendly and cost-effective disposal and reutilization of sludge wastes are essential in wastewater treatment processes (WWTPs). Converting activated sludge into biochar via thermochemical treatment is a promising technology for waste management in WWTPs. This review summarizes the compositions of sludge, the dewatering methods, and the thermochemical methods whichinfluence the structures, chemistry, and catalytic performances of the derived biochar. Read More

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December 2020

Expanded Polytetrafluoroethylene/Graphite Composites for Easy Water/Oil Separation.

ACS Appl Mater Interfaces 2020 Aug 12;12(34):38241-38248. Epub 2020 Aug 12.

Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States.

Oil spills in the ocean greatly threaten local environments, marine creatures, and coastal economies. An automatic water/oil separation material system was proposed in this study, and a tubular geometry was chosen to demonstrate the water/oil separation efficiency and effectiveness. The water/oil separation tubes were made of expanded polytetrafluoroethylene (ePTFE) and graphite composites. Read More

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An Ab Initio Computational Study of Electronic and Structural Factors in the Isomerization of Donor-Acceptor Stenhouse Adducts.

J Phys Chem A 2020 Sep 9;124(38):7756-7767. Epub 2020 Sep 9.

Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum D-44780, Germany.

In this work, the photochemically and thermally induced isomerization of multiple donor-acceptor Stenhouse adducts (DASAs) of the first, second, and third generation is studied by means of state-of-the-art ab initio electronic structure methods leading to new insight into multiple facets of the reaction mechanism. Importantly, prior to any studies of the reaction mechanism, a set of test calculations demonstrate the suitability of the applied ADC(2) and CC2 methods in the present context. An important aspect in this regard is the availability of electronic energies and gradients under implicit consideration of solvent effects. Read More

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September 2020

Characterization of QTLs and Candidate Genes for Days to Heading in Rice Recombinant Inbred Lines.

Genes (Basel) 2020 08 19;11(9). Epub 2020 Aug 19.

National Institute of Crop Science, Rural Development Administration, Wanju 55365, Korea.

Understanding the gene mechanisms controlling days to heading (DH) is important in rice breeding for adaption in the target environment. Using a recombinant inbred line population derived from the cross between two rice cultivars, Koshihikari and Baegilmi, we identified three consistent quantitative trait loci (QTLs) for DH for two years, , , and on chromosomes 3, 6, and 7, respectively. While Baegilmi contributed the allele for early heading at and with the additive effect of five days each, Koshihikari contributed the allele for early heading at with the additive effect of three days. Read More

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Anatase versus Triphasic TiO: Near-identical synthesis and comparative structure-sensitive photocatalytic degradation of methylene blue and 4-chlorophenol.

J Colloid Interface Sci 2021 Jan 21;581(Pt A):205-217. Epub 2020 Jul 21.

Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India. Electronic address:

Studies on photocatalytic activity of monophasic and biphasic TiO have been well explored. However, detailed studies on the photocatalytic activity of triphasic titania, as opposed to monophasic or biphasic TiO are scarce. Here we report a comparative structure-sensitive photocatalytic study of triphasic versus anatase TiO, both have been synthesized under near-identical conditions through a customized sol-gel approach. Read More

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January 2021

P-N conversion of charge carrier types and high photoresponsive performance of composition modulated ternary alloy W(SSe) field-effect transistors.

Nanoscale 2020 Jul;12(28):15304-15317

Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China. and Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China and Shanghai Institute of Intelligent Electronics & Systems, Fudan University, Shanghai 200433, China.

Transition metal dichalcogenides (TMDs) have emerged as a new class of two-dimensional (2D) materials, which are promising for diverse applications in nanoelectronics, optoelectronics, and photonics. To satisfy the requirements of the building blocks of functional devices, systematic modulation of the band gap and carrier type of TMDs materials becomes a significant challenge. Here, we report a salt-assisted chemical vapor deposition (CVD) approach for the simultaneous growth of alloy W(SxSe1-x)2 nanosheets with variable alloy compositions. Read More

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Improvement of Characteristics of Metal Doped TiO₂ Thin Film and Application to Perovskite Solar Cell.

J Nanosci Nanotechnol 2020 Nov;20(11):7130-7134

Department of Electrical Engineering, Gachon University, 1342 Seongnam Daero, Sujeong-Gu, Seongnam-Si, Gyeonggi-Do, 13120, Korea.

Over the past three decades, the development of renewable energy technologies has attracted significant attention to overcome both environmental pollution and global warming. Recently, a new type of solar cell based on an organic-inorganic halide perovskite material has been developed. Perovskite solar cells (PSC) were first reported in 2009; their efficiencies increased rapidly from 3. Read More

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November 2020

AgPd nanoparticles for electrocatalytic CO reduction: bimetallic composition-dependent ligand and ensemble effects.

Nanoscale 2020 Jul 25;12(26):14068-14075. Epub 2020 Jun 25.

Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.

Monodisperse AgPd nanoparticles (NPs) were synthesized and studied as an efficient catalyst for electrocatalytic CO reduction by modulating bimetallic compositions. The mechanistic studies, based on density functional theory (DFT) calculations and environmental diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) analysis, revealed that the incorporation of Ag in AgPd NPs can effectively weaken CO adsorption on all possible Pd surface sites (the ligand effects), and more importantly, disrupt the strongest multi-centered CO-binding sites (the ensemble effects). With properly tuned CO adsorption, which is ordinarily too strong over pure Pd, AgPd NPs were found to be the best composition for the efficient production of CO. Read More

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Catalyst-Free Growth of Two-Dimensional BCN Materials on Dielectrics by Temperature-Dependent Plasma-Enhanced Chemical Vapor Deposition.

ACS Appl Mater Interfaces 2020 Jul 7;12(29):33113-33120. Epub 2020 Jul 7.

State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.

Traditional methods to prepare two-dimensional (2D) B-C-N ternary materials (BCN), such as chemical vapor deposition (CVD), require sophisticated experimental conditions such as high temperature, delicate control of precursors, and postgrowth transfer from catalytic substrates, and the products are generally thick or bulky films without the atomically mixed phase of B-C-N, hampering practical applications of these materials. Here, for the first time, we develop a temperature-dependent plasma-enhanced chemical vapor deposition (PECVD) method to grow 2D BCN materials directly on noncatalytic dielectrics at low temperature with high controllability. The C, N, and B compositions can be tuned by simply changing the growth temperature. Read More

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Observation of morphology resembling Hydrangea macrophylla flower in SILAR-deposited MFeO (M=Co, Ni, Mn) nanocrystallites: synergetic effect on electrochemical performance.

Nanotechnology 2020 Oct 18;31(41):415402. Epub 2020 Jun 18.

Sustainable Energy Laboratory, Department of Metallurgical and Materials Engineering, Defence Institute of Advanced Technology, Girinagar, Pune 411025, India.

The successive ionic layer adsorption and reaction (SILAR) experimental process has been used to develop a high-efficiency electrode of MFeO (M = Ni, Co and Mn) on substrates at ambient temperature. Structural, morphological and electrochemical properties have been investigated using x-ray diffraction (XRD), a scanning electron microscope (SEM) and an electrochemical test station, respectively. A morphology resembling the Hydrangea macrophylla flower has been observed and tuned with varying Fe concentration. Read More

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October 2020

Hydrogen-Bond-Driven Chemical Separations: Elucidating the Interfacial Steps of Self-Assembly in Solvent Extraction.

ACS Appl Mater Interfaces 2020 Jul 1;12(28):32119-32130. Epub 2020 Jul 1.

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Chemical separations, particularly liquid extractions, are pervasive in academic and industrial laboratories, yet a mechanistic understanding of the events governing their function are obscured by interfacial phenomena that are notoriously difficult to measure. In this work, we investigate the fundamental steps of ligand self-assembly as driven by changes in the interfacial H-bonding network using vibrational sum frequency generation. Our results show how the bulk pH modulates the interfacial structure of extractants at the buried oil/aqueous interface via the formation of unique H-bonding networks that order and bridge ligands to produce self-assembled aggregates. Read More

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Modern Chemical Routes for the Controlled Synthesis of Anisotropic Bimetallic Nanostructures and Their Application in Catalysis.

Front Chem 2020 19;8:357. Epub 2020 May 19.

Centre for Nano and Material Sciences, Jain Global Campus, Jain University, Ramanagara, India.

Bimetallic nanoparticles (BNPs) have attracted greater attention compared to its monometallic counterpart because of their chemical/physical properties. The BNPs have a wide range of applications in the fields of health, energy, water, and environment. These properties could be tuned with a number of parameters such as compositions of the bimetallic systems, their preparation method, and morphology. Read More

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Fully synthetic matrices for in vitro culture of primary human intestinal enteroids and endometrial organoids.

Biomaterials 2020 09 25;254:120125. Epub 2020 May 25.

Center for Gynepathology Research and Biological Engineering Department, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02138, USA. Electronic address:

Epithelial organoids derived from human donor tissues are important tools in fields ranging from regenerative medicine to drug discovery. Organoid culture requires expansion of stem/progenitor cells in Matrigel, a tumor-derived extracellular matrix (ECM). An alternative completely synthetic ECM could improve reproducibility, clarify mechanistic phenomena, and enable human implantation of organoids. Read More

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September 2020

Artificial Chemist: An Autonomous Quantum Dot Synthesis Bot.

Adv Mater 2020 Jul 4;32(30):e2001626. Epub 2020 Jun 4.

Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, 27606, USA.

The optimal synthesis of advanced nanomaterials with numerous reaction parameters, stages, and routes, poses one of the most complex challenges of modern colloidal science, and current strategies often fail to meet the demands of these combinatorially large systems. In response, an Artificial Chemist is presented: the integration of machine-learning-based experiment selection and high-efficiency autonomous flow chemistry. With the self-driving Artificial Chemist, made-to-measure inorganic perovskite quantum dots (QDs) in flow are autonomously synthesized, and their quantum yield and composition polydispersity at target bandgaps, spanning 1. Read More

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