jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Lufeng Chen | Hongshan Zhong | Xun Qi | Haibo Shao | Ke Xu
Source: RSC Advances (article, 2019-01-01)
Field: Materials Science — Biomaterials

Modified core–shell magnetic mesoporous zirconia nanoparticles formed through a facile “outside-to-inside” way for CT/MRI dual-modal imaging and magnetic targeting cancer chemotherapy Iron oxide based magnetic nanoparticles (MNPs) as typical theranostic nanoagents have been popularly used in various biomedical applications. Conventional core-shell MNPs are usually synthesized from inside to outside. This method has strict requirements on the interface properties of magnetic cores and the precursors of the coating shell. The shape and size of MNPs are significantly influenced by that of the pre-synthesized magnetic cores. Most core-shell MNPs have only single T2W MRI imaging ability. Herein, we propose a new synthetic strategy for core-mesoporous shell structural MNPs, where hollow mesoporous nanospheres which exhibit an intrinsic property for both CT imaging and drug loading were used as the shell and the magnetic cores were produced in the cavity of the shell. A new type of MNPs, Fe<sub>3</sub>O<sub>4</sub>@ZrO<sub>2</sub> nanoparticles (M-MZNs), were developed using this facile outside-to-inside way, where multiple Fe<sub>3</sub>O<sub>4</sub> nanoparticles grew inside the cavity of the mesoporous hollow ZrO<sub>2</sub> nanospheres through chemical coprecipitation. The obtained MNPs not only exhibited superior magnetic properties and CT/MR imaging ability but also high drug loading capacity. <i>In vitro</i> experiment results revealed that M-MZNs-PEG loaded with doxorubicin (DOX) presented selective growth inhibition against cancer cells due to pH-sensitive DOX release and enhanced endocytosis by cancer cells under a magnetic field. Furthermore, the proposed MNPs exhibited CT/MRI dual modal imaging ability and effective physical targeting to tumor sites <i>in vivo</i>. More importantly, experiments of magnetic targeting chemotherapy on tumor bearing mice demonstrated that the nanocomposites significantly suppressed tumor growth without obvious pathological damage to major organs. Henceforth, this study provides a new strategy for CT/MRI dual-modal imaging guided and magnetic targeting cancer therapy. Materials science ; Mesoporous material ; Magnetic nanoparticles ; Nanoparticle ; Nanotechnology ; Magnetic core ; Chemistry ; Organic chemistry Nanoparticle-Based Drug Delivery ; Nanoplatforms for cancer theranostics ; Glioma Diagnosis and Treatment
Authors: Abdul Halim Poh | Mohd Fadzil Jamaludin | Iman Aris Fadzallah | Nik Muhd Jazli Nik Ibrahim | Farazila Yusof | FRM Adikan | M. Moghavvemi
Source: Journal of Near Infrared Spectroscopy (article, 2019-08-13)
Field: Chemistry — Inorganic Chemistry

Diffuse reflectance spectroscopic analysis of barium sulfate as a reflection standard within 173–2500 nm: From pure to sintered form The use of barium sulfate (BaSO 4 ) as a low-cost reflectance standard has been documented for some time. In its pure salt form, the optical characteristics do have advantages compared to laboratory-grade sintered polytetrafluoroethylene (PTFE). However, its practical use has little advantage against the stability of PTFE. In this paper, a process of producing pelletized BaSO 4 , and characterization of its optical reflectance properties is reported. In its sintered form, data-driven analysis shows that BaSO 4 is a commendable low-cost, high-reflection and a high-consistency material. The current sintered forms, though crude, registers a relatively stable texture to withstand minor mechanical stress, while having up to an average 92% reflectivity across the UV-VIS-NIR range (173–2500 nm) compared to a PTFE reflection standard. Materials science ; Reflectivity ; Reflection (computer programming) ; Diffuse reflection ; Barium ; Optics ; Barium sulphate ; Diffuse reflectance infrared fourier transform ; Composite material ; Texture (cosmology) ; Barium sulfate ; Mineralogy ; Optoelectronics ; Metallurgy ; Chemistry ; Computer science Pigment Synthesis and Properties ; Glass properties and applications ; Luminescence Properties of Advanced Materials
Authors: Xiaolin Li | Min Zhang | Yixing Wang | Aditya Prasad | Wei Chen | Linda S. Schadler | L. Catherine Brinson
Source: Materialia (article, 2019-03-01)
Field: Materials Science — Polymers and Plastics

Rethinking interphase representations for modeling viscoelastic properties for polymer nanocomposites Interphase ; Materials science ; Representation (politics) ; Viscoelasticity ; Nanocomposite ; Composite material ; Biological system Polymer Nanocomposites and Properties ; Polymer crystallization and properties ; Composite Material Mechanics
Authors: Jian Zhi Hu | Hao Dai | Yanbo Zeng | Yiwen Yang | Hailong Wang | Xudong Zhu | Lei Li | Guobao Zhou | Ruoyu Chen | Longhua Guo
Source: Nanomaterials (article, 2019-04-02)
Field: Chemistry — Electrochemistry

A Cross-Linker-Based Poly(Ionic Liquid) for Sensitive Electrochemical Detection of 4-Nonylphenol In this study, we report a cross-linker-based poly(ionic liquid) (PIL) for the sensitive detection of 4-nonylphenol (4-NP). PIL was poly(1,4-butanediyl-3,3'-bis-l-vinylimidazolium dibromide) (poly([V₂C₄(mim)₂]Br₂)). Poly([V₂C₄(mim)₂]Br₂) was prepared via one-step free-radical polymerization. The poly([V₂C₄(mim)₂]Br₂) was characterized by infrared spectroscopy, Raman spectroscopy, thermal gravimetric analyzer and scanning electron microscope. The poly([V₂C₄(mim)₂]Br₂) was then drop-cast onto a glassy carbon electrode (GCE) to obtain poly([V₂C₄(mim)₂]Br₂)/GCE. In comparison with a bare GCE, poly([V₂C₄(mim)₂]Br₂)/GCE exhibited higher peak current responses for [Fe(CN)₆]<sup>3-/4-</sup>, lower charge transfer resistance, and larger effective surface area. While comparing the peak current responses, we found the peak current response for 4-NP using poly([V₂C₄(mim)₂]Br₂)/GCE to be 3.6 times higher than a traditional cross-linker ethylene glycol dimethacrylate (EGDMA) based poly(EGDMA) modified GCE. The peak current of poly([V₂C₄(mim)₂]Br₂) sensor was linear to 4-NP concentration from 0.05 to 5 μM. The detection limit of 4-NP was obtained as 0.01 μM (S/N = 3). The new PIL based electrochemical sensor also exhibited excellent selectivity, stability, and reusability. Furthermore, the poly([V₂C₄(mim)₂]Br₂)/GCE demonstrated good 4-NP detection in environmental water samples. Detection limit ; Materials science ; Ionic liquid ; Raman spectroscopy ; Ethylene glycol dimethacrylate ; Electrochemistry ; Analytical Chemistry (journal) ; Nuclear chemistry ; Polymerization ; Polymer chemistry ; Chemistry ; Electrode ; Methacrylic acid ; Physical chemistry ; Polymer ; Organic chemistry ; Chromatography Electrochemical Analysis and Applications ; Electrochemical sensors and biosensors ; Conducting polymers and applications
Authors: Jeong Hwa Song | Dae Won Kim | Dong Won Kang | Woo Ram Lee | Chang Seop Hong
Source: Chemical Communications (article, 2019-01-01)
Field: Chemistry — Inorganic Chemistry

Humidity-triggered single-crystal-to-single-crystal structural transformations in a Zn(<scp>ii</scp>) coordination polymer displaying unusual activation energy change in proton conductivity Single-crystal-to-single crystal structural conversions occur in a Zn(ii) coordination polymer, uniquely induced by fine-tuned relative humidity. Proton conductivity depends on the number of hydrogen bonds in the structures. Slope change in the Arrhenius plot is uncommon among coordination-based conductors and associated with temperature-dependent phase changes. Proton ; Activation energy ; Single crystal ; Conductivity ; Crystal (programming language) ; Polymer ; Crystallography ; Humidity ; Coordination polymer ; Materials science ; Thermal conduction ; Crystal structure ; Chemistry ; Physical chemistry ; Thermodynamics ; Composite material ; Physics Metal-Organic Frameworks: Synthesis and Applications ; Organic and Molecular Conductors Research ; Perovskite Materials and Applications
Authors: Alexandru B. Georgescu | Sohrab Ismail-Beigi
Source: Physical Review Applied (article, 2019-06-27)
Field: Materials Science — Materials Chemistry

Surface Piezoelectricity of (0001) Sapphire The authors provide a first-principles analysis of and methodology for easily estimating the surface piezoelectric response of materials that are not piezoelectric in the bulk. This study shows that the surface of sapphire ($\ensuremath{\alpha}$-Al${}_{2}$O${}_{3}$) is piezoelectric, in both Al-terminated and hydroxylated forms. If confirmed by experiment, this effect would be of high technological significance. For example, it would lead to a loss mechanism in the sapphire-based Josephson junctions used in a variety of quantum devices, and would allow for the fine tuning of $e.g.$ lasers and chemical catalysts. Furthermore, many technologically relevant materials are grown using sapphire as a substrate. Sapphire ; Piezoelectricity ; Surface (topology) ; Silicon on sapphire ; Josephson effect ; Laser Electronic and Structural Properties of Oxides ; Ferroelectric and Piezoelectric Materials ; Chemical and Physical Properties of Materials
Authors: Goudappagouda Goudappagouda | Kiran Asokan | Rashmi A. Nayak | Retheesh Krishnan | Sukumaran Santhosh Babu
Source: Dyes and Pigments (article, 2019-09-27)
Field: Materials Science — Materials Chemistry

Tuning phosphorescence features of triphenylamines by varying functional groups and intermolecular interactions Phosphorescence ; Intersystem crossing ; Intermolecular force ; Photochemistry ; Triphenylamine ; Singlet state ; Triplet state ; Chemistry ; Crystal (programming language) ; Phosphorescent organic light-emitting diode ; Fluorescence ; Materials science ; Molecule ; Excited state ; Organic chemistry ; Atomic physics Luminescence and Fluorescent Materials ; Organic Light-Emitting Diodes Research ; Perovskite Materials and Applications
Authors: Jost Ruwoldt | Muh Kurniawan | Geir Humborstad Sørland | Sébastien Simon | Johan Sjöblom
Source: Journal of Dispersion Science and Technology (article, 2019-07-01)
Field: Chemistry — Analytical Chemistry

Influence of wax inhibitor molecular weight: Fractionation and effect on crystallization of polydisperse waxes The influence of wax inhibitor molecular weight on wax crystallization was investigated in three steps: (1) Wax inhibitor fractionation via stepwise precipitation or ultrasonic disintegration, (2) characterization of inhibitor and sub-fractions in terms of molecular weight distribution, hydrodynamic radius, and precipitation from pure solvent, and (3) inhibitor effect on wax appearance temperature (WAT), waxy gelling, and wax crystal morphology. Stepwise precipitation yielded narrower molecular weight distributions, whereas ultrasonic disintegration reduced the average molecular weight and increase the polydispersity index. Changes in inhibitor molecular weight could improve as well as diminish WAT depression. Waxy gelation temperature showed similar trends, but overall effects were more pronounced. It was concluded the wax inhibitor molecular weight is a parameter that can be used to fine-tune additives to a particular waxy oil, but only after an effective PPD type has been identified. Wax ; Dispersity ; Crystallization ; Fractionation ; Molar mass distribution ; Chemistry ; Paraffin wax ; Precipitation ; Chromatography ; Chemical engineering ; Organic chemistry ; Polymer Petroleum Processing and Analysis ; Food Chemistry and Fat Analysis ; Phase Equilibria and Thermodynamics
Authors: Jing Xue | Hailong Li | Jixian Liu | Yao Wang | Yuanmeng Liu | Dong Sun | Wei Wang | Linjun Huang | Jianguo Tang
Source: Materials Letters (article, 2019-01-30)
Field: Materials Science — Materials Chemistry

Facile synthesis of silver sulfide quantum dots by one pot reverse microemulsion under ambient temperature Silver sulfide ; Quantum dot ; Materials science ; Sulfide ; Microemulsion ; Sodium sulfide ; Lead sulfide ; Silver nanoparticle ; Aqueous solution ; Chemical engineering ; Quantum yield ; Inorganic chemistry ; Photochemistry ; Fluorescence ; Nanoparticle ; Nanotechnology ; Chemistry ; Organic chemistry ; Optics ; Metallurgy Quantum Dots Synthesis And Properties ; Nanocluster Synthesis and Applications ; Gold and Silver Nanoparticles Synthesis and Applications
Authors: Jie Chen | Wei Yan | Esther J. Townsend | Jiangtao Feng | Long Pan | Veronica Del Angel Hernandez | Charl F. J. Faul
Source: Angewandte Chemie (article, 2019-06-17)
Field: Materials Science — Materials Chemistry

Tunable Surface Area, Porosity, and Function in Conjugated Microporous Polymers Abstract Simple inorganic salts are used to tune N‐containing conjugated microporous polymers (CMPs) synthesized by Buchwald–Hartwig (BH) cross‐coupling reactions. Poly(triphenylamine), PTPA, initially shows a broad distribution of micropores, mesopores, and macropores. However, the addition of inorganic salts affects all porous network properties significantly: the pore size distribution is narrowed to the microporous range only, mimicking COFs and MOFs; the BET surface area is radically improved from 58 m 2 g −1 to 1152 m 2 g −1 ; and variations of the anion and cation sizes are used to fine‐tune the surface area of PTPA, with the surface area showing a gradual decrease with an increase in the ionic radius of salts. The effect of the salt on the physical properties of the polymer is attributed to adjusting and optimizing the Hansen solubility parameters (HSPs) of solvents for the growing polymer, and named the Beijing–Xi'an Jiaotong (BXJ) method. Microporous material ; Conjugated microporous polymer ; Polymer ; Mesoporous material ; BET theory ; Materials science ; Chemical engineering ; Specific surface area ; Porosity ; Conjugated system ; Ionic bonding ; Solubility ; Polymer chemistry ; Adsorption ; Chemistry ; Ion ; Organic chemistry ; Catalysis ; Composite material Covalent Organic Framework Applications ; Metal-Organic Frameworks: Synthesis and Applications ; Membrane Separation and Gas Transport
Authors: Su‐Kyung Lee | Jason Tam | Weiwei Li | Bosco Yu | Hai Jun Cho | Javad Samei | David S. Wilkinson | Heeman Choe | U. Erb
Source: Materials Characterization (article, 2019-10-26)
Field: Materials Science — Materials Chemistry

Multi-scale morphological characterization of Ni foams with directional pores Materials science ; Scanning electron microscope ; Characterization (materials science) ; Composite material ; Casting ; Microstructure ; Relative density ; Slurry ; Oxide ; Metal foam ; Electron backscatter diffraction ; Porosity ; Metallurgy ; Nanotechnology Nanoporous metals and alloys ; Cellular and Composite Structures ; Pickering emulsions and particle stabilization
Authors: Fei Xu | Haojie Han | Baichuan Ding | Yuqian Qiu | En Zhang | Hejun Li | Stefan Kaskel
Source: Microporous and Mesoporous Materials (article, 2019-03-26)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Engineering pore ratio in hierarchical porous carbons towards high-rate and large-volumetric performances Macropore ; Materials science ; Porosity ; Chemical engineering ; Thermal diffusivity ; Polystyrene ; Carbon fibers ; Aspect ratio (aeronautics) ; Nanotechnology ; Bulk density ; Composite material ; Polymer ; Mesoporous material ; Chemistry ; Environmental science ; Soil science ; Catalysis Supercapacitor Materials and Fabrication ; Conducting polymers and applications ; Advanced battery technologies research
Authors: Pablo Ares | Michele Pisarra | P. Segovia | Cristina Dı́az | Fernando Martı́n | E. G. Michel | Félix Zamora | Cristina Gómez‐Navarro | Julio Gómez‐Herrero
Source: Advanced Functional Materials (article, 2019-01-11)
Field: Materials Science — Materials Chemistry

Tunable Graphene Electronics with Local Ultrahigh Pressure Abstract Fine‐tuning of graphene effective doping is achieved by applying ultrahigh pressures (&gt;10 GPa) using atomic force microscopy (AFM) diamond tips. Specific areas in graphene flakes are irreversibly flattened against a SiO 2 substrate. This work represents the first demonstration of local creation of very stable effective p‐doped graphene regions with nanometer precision, as unambiguously verified by a battery of techniques. Importantly, the doping strength depends monotonically on the applied pressure, allowing a controlled tuning of graphene electronics. Through this doping effect, ultrahigh pressure modifications include the possibility of selectively modifying graphene areas to improve their electrical contact with metal electrodes, as shown by conductive AFM. Density functional theory calculations and experimental data suggest that this pressure level induces the onset of covalent bonding between graphene and the underlying SiO 2 substrate. This work opens a convenient avenue to tuning the electronics of 2D materials and van der Waals heterostructures through pressure with nanometer resolution. Graphene ; Materials science ; Nanotechnology ; Doping ; Substrate (aquarium) ; van der Waals force ; Graphene nanoribbons ; Nanometre ; Optoelectronics ; Electronics ; Electrode ; Composite material ; Molecule Graphene research and applications ; Molecular Junctions and Nanostructures ; Quantum and electron transport phenomena
Authors: Dilip Kumar Singh | Vikram Sharma | Ritwik Basu | M. Eskandari
Source: Procedia Manufacturing (article, 2019-01-01)
Field: Materials Science — Metals and Alloys

Understanding the effect of weld parameters on the microstructures and mechanical properties in dissimilar steel welds Welding of dissimilar steel grades, such as stainless and medium carbon steel, is becoming increasingly challenging in petrochemical refineries, as well as in many mining and mineral processing operations. Problems encountered in dissimilar weld joints during in-service applications are associated with formation of brittle phases and undesired residual stresses that develop, resulting in cracks or failures in the component. Many of these problems can be largely tackled by tailoring the microstructure during the weld processing steps. It has been demonstrated in this work that welding process variables can have a direct impact on the resulting microstructure and that the properties of the material can be fine-tuned through a better understanding of the different microstructural mechanisms. Few different weld specimens of a stainless (SS 304) and a medium carbon (EN 8) steels were prepared by changing the weld parameters (current, voltage, speed) by tungsten inert gas (TIG) welding technique. The studies on the microstructural development were performed using the electron backscattered diffraction (EBSD) techniques. Large microstructural differences were brought out between these samples, especially in terms of the distribution of phases and fractions of grain boundary. The tensile strength measured for these welded joints had a strong bearing on the presence of low angle grain boundaries (LAGB). This brief study presents a systematic approach to establish microstructure-mechanical property relationship in dissimilar steel welded joints. Materials science ; Welding ; Electron backscatter diffraction ; Gas tungsten arc welding ; Microstructure ; Metallurgy ; Ultimate tensile strength ; Equiaxed crystals ; Brittleness ; Composite material ; Arc welding Hydrogen embrittlement and corrosion behaviors in metals ; Welding Techniques and Residual Stresses ; Microstructure and Mechanical Properties of Steels
Authors: Victor E. Cuenca | Hernán Martinelli | María de los Ángeles Ramírez | Hernán A. Ritacco | Patrizia Andreozzi | Sergio Moya
Source: Langmuir (article, 2019-10-09)
Field: Materials Science — Biomaterials

Polyphosphate Poly(amine) Nanoparticles: Self-Assembly, Thermodynamics, and Stability Studies The interaction of polyamine poly(allylamine hydrochloride) with Na<sub>3</sub>PO<sub>4</sub>, Na<sub>4</sub>P<sub>2</sub>O<sub>7</sub>, Na<sub>5</sub>P<sub>3</sub>O<sub>10</sub>, Na<sub>6</sub>P<sub>6</sub>O<sub>18</sub>, and (NaPO<sub>3</sub>)<sub>26</sub> salts and the formation of polyamine phosphate nanoparticles (PANs) are studied here. Dynamic light scattering, isothermal titration calorimetry (ITC), electrophoretical mobility measurements, atomic force microscopy, and transmission electron microscopy are used to explore the formation, stability, and pH sensitivity of PANs. An optimal concentration for PAN formation is found for each phosphate salt in terms of the most stable size and lowest polydispersity index of the nanoparticles. The minimal concentration of phosphate ions for PAN formation decreases with the increasing number of phosphate groups per phosphate salt. ITC measurements show that all polyphosphates display a characteristic endothermic peak, which is not present when monophosphates are used for PAN formation. pH stability of PANs depends on the type of phosphate salt. PANs formed with small phosphates show a small window of stability with pH from 8 to 9, while those formed with long phosphates are stable in more acidic pH environments. Our findings open multiple possibilities for fine-tuning the pH sensitivity of PANs by varying phosphate salts for potential applications in drug delivery. Chemistry ; Polyphosphate ; Isothermal titration calorimetry ; Phosphate ; Dynamic light scattering ; Dispersity ; Salt (chemistry) ; Nanoparticle ; Endothermic process ; Titration ; Calorimetry ; Pyrophosphate ; Inorganic chemistry ; Nuclear chemistry ; Chemical engineering ; Organic chemistry ; Adsorption ; Physical chemistry biodegradable polymer synthesis and properties ; Polymer Surface Interaction Studies ; Synthesis and properties of polymers