jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Praful Choudhari | Vivek Kulkarni | S. V. Khandal
Source: Modern Mechanical Engineering (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Study of the Diffusion Behavior of Seawater Absorption in Multi-Walled Carbon Nanotubes/Halloysite Nanotubes Hybrid Nanofillers Modified Epoxy-Based Glass/Carbon Fiber Composites In the maritime industry, cost-effective and lightweight Fiber Reinforced Polymer (FRP) composites offer excellent mechanical properties, design flexibility, and corrosion resistance. However, their reliability in harsh seawater conditions is a concern. Researchers address this by exploring three approaches: coating fiber surfaces, hybridizing fibers and matrices with or without nanofillers, and interply rearrangement. This study focuses on evaluating the synergistic effects of interply rearrangement of glass/carbon fibers and hybrid nanofillers, specifically Multi-walled carbon nanotubes (MWCNT) and Halloysite nanotubes (HNT). The aim is to enhance impact properties by minimizing moisture absorption. Hybrid nanocomposites with equal-weight proportions of two nanofillers: 0 wt.%, 1 wt.%, and 2 wt.% were exposed to seawater for 90 days. Experimental data was subjected to modelling through the application of Predictive Fick’s Law. The study found that the hybrid composite containing 2 wt.% hybrid nanofillers exhibited a 22.10% increase in impact performance compared to non-modified counterparts. After 90 days of seawater aging, the material exhibited enhanced resistance to moisture absorption (15.74%) and minimal reduction in impact strength (8.52%) compared to its dry strength, with lower diffusion coefficients. Materials science ; Carbon nanotube ; Halloysite ; Epoxy ; Composite material ; Seawater ; Absorption of water ; Diffusion ; Glass fiber Carbon Nanotubes in Composites ; Conducting polymers and applications ; Nanopore and Nanochannel Transport Studies
Authors: Maryam Abdulsatar Abduljabar | Sundus Hadi Merza
Source: Baghdad Science Journal (article, 2024-02-20)
Field: Chemistry — Organic Chemistry

Graphene Oxide Decorated with Nickel Cobaltite Nanoparticles as an Adsorbent for Cationic Methyl Green Dye: Kinetic, Isotherm, and Thermodynamic Studies ‎تم في هذه الدراسة ، تزيين ‏رقائق أكسيد الجرافين (‏GO‏) بجسيمات ‏كوبلتيت النيكل النانوية ‏NiCo2O4‎‏(‏NC‏) عن طريق الترسيب في ‏الموقع ، وتم استخدام المتراكب ‏المحضر (‏NC: GO‏) كسطح ماز لإزالة ‏صبغة الميثيل الخضراء ( ‏MG‏) من ‏المحاليل المائية. تم التحقق من ‏التغطية الناجحة لأوكسيد الجرافين ‏بجزيئات كوبلتيت النيكل النانوية ‏‏(‏NC‏) باستخدام دراسات ‏FT-IR‏ وحيود ‏الأشعة السينية (‏XRD‏). كانت أحجام ‏الجسيمات البلورية لل ‏NC‏ و ‏ لل ‏GO‏ المزين ب NCهي ‏‎10.53‎‏ نانوميتر ‏‏9.30 نانومتر على التوالي. تم دراسة ‏تأثير العديد من العوامل التجريبية ‏، بما في ذلك زمن التلامس ، وكمية ‏السطح الماز ، ودرجة الحرارة. كان ‏وقت التلامس الأمثل وكمية السطح 120 ‏دقيقة و 3 مجم / لتر على التوالي. ‏تتلائم بيانات الامتزاز بشكل أفضل مع ‏ايزوثيرم ‏Freundlich‏. تم استخدام ‏أربعة نماذج حركية لتتبع عملية ‏الامتزاز: معادلة زائفة من الدرجة ‏الأولى ، ومعادلة زائفة من الدرجة ‏الثانية ، ومعادلة الانتشار داخل ‏الجسيمات ، ومعادلة بويد. أظهرت ‏نمذجة البيانات التجريبية أن حركية ‏الامتزاز كانت ممثلة بشكل جيد ‏بنموذج الرتبة الثانية الزائفة (‏R2 ‎‎= 0.9945‎‏) مع معدل ثابت سرعة يبلغ 3.2 ‏‏× 10 - 3 (جم / مجم. دقيقة). يتم ‏امتصاص صبغة ‏MG‏ تدريجيًا بواسطة ‏الجسيمات النانوية ‏NC‏ من خلال ‏الانتشار داخل الجسيمات ويتم ‏الاحتفاظ بها بعد ذلك في مسام أصغر. ‏أظهرت قيم التحليل الديناميكي ‏الحراري أن عملية امتزاز صبغة ‏MG‏ ‏كانت ماصة للحرارة بطبيعتها ، و ‏تلقائية وعملية الامتزاز فيزيائية. الكلمات المفتاحية: الانتشار داخل الجسيمات ، المسافات البينية، النموذج الزائف من الدرجة الأولى ، معادلة بويد Cobaltite ; Nickel oxide ; Graphene ; Nickel ; Cationic polymerization ; Materials science ; Adsorption ; Nanoparticle ; Oxide ; Chemical engineering ; Kinetic energy ; Chemistry ; Inorganic chemistry ; Metallurgy ; Organic chemistry ; Nanotechnology ; Polymer chemistry Nanomaterials for catalytic reactions ; Adsorption and biosorption for pollutant removal ; Graphene and Nanomaterials Applications
Authors: Jurjen Cazemier | Moussa Zaarour | Sarah Komaty | Polina Lavrik | Antonio Aguilar‐Tapia | Sudheesh Kumar Veeranmaril | Jean‐Louis Hazemann | Javier Ruiz-Martı́nez
Source: Inorganic Chemistry Frontiers (article, 2024-01-01)
Field: Chemistry — Organic Chemistry

Atypical hydrogenation selectivity of platinum by reactive environment modulation Non-polar reactive environment maintained by Silicalite-1 pore walls and toluene solvent favors CC versus CO hydrogenation over confined Pt particle of Pt@S-1 giving rise to excellent selectivity. Selectivity ; Platinum ; Toluene ; Chemistry ; Polar ; Solvent ; Inorganic chemistry ; Catalysis ; Chemical engineering ; Photochemistry ; Organic chemistry Nanomaterials for catalytic reactions ; Asymmetric Hydrogenation and Catalysis ; Catalytic Processes in Materials Science
Authors: Wonseok Lee | Andrew M. Smith
Source: ChemRxiv (preprint, 2024-02-09)
Field: Materials Science — Materials Chemistry

Interdiffusion-Enhanced Cation Exchange for HgSe and HgCdSe Nanocrystals with Infrared Bandgaps Colloidal semiconductor nanocrystals based on CdSe have been precisely optimized for photonic applications in the visible spectrum, with modern products exhibiting structural uniformity, near 100% quantum yield, and linewidths narrower than 100 meV. Here we report homogeneous nanocrystals with tunable bandgaps in the infrared based on HgSe and Hg(x)Cd(1–x)Se alloys deriving from CdSe precursors. We find that Ag+ catalyzes cation interdiffusion to reduce the CdSe-HgSe alloying temperature from 250 °C to 80 °C. Together with ligands that modulate surface cation exchange rates, interdiffusion-enhanced Hg2+ exchange of diverse CdSe nanocrystals proceeds homogeneously and completely. The products retain sizes, shapes, and uniformity of the parent nanocrystals but exhibit enhanced absorption. After passivation with heteroepitaxial CdZnS shells, photoluminescence wavelength is tunable in the shortwave infrared by composition without changing size, with 80–91% quantum yield and linewidths near 100 meV. These materials may find applications in infrared photonic devices and infrared bioimaging. Nanocrystal ; Photoluminescence ; Infrared ; Passivation ; Quantum yield ; Materials science ; Photonics ; Optoelectronics ; Absorption (acoustics) ; Infrared spectroscopy ; Semiconductor ; Yield (engineering) ; Colloid ; Quantum dot ; Nanotechnology ; Chemistry ; Optics ; Physical chemistry ; Organic chemistry ; Physics ; Fluorescence Quantum Dots Synthesis And Properties ; Chalcogenide Semiconductor Thin Films ; Nanocluster Synthesis and Applications
Authors: Restu Hikmah Ayu Murti | Muhammad Abdus Salam Jawwad | You Sheng-Jie | Wang Ya-fen
Source: Research Square (preprint, 2024-03-13)
Field: Chemistry — Analytical Chemistry

RETRACTED: The investigation of mechanism isoniazid adsorption onto cassia fistula-based activated carbon Cassia ; Mechanism (biology) ; Adsorption ; Isoniazid ; Activated carbon ; Fistula ; Carbon fibers ; Chemistry ; Materials science ; Organic chemistry ; Medicine ; Surgery ; Composite material ; Physics ; Tuberculosis ; Pathology Analytical chemistry methods development ; Covalent Organic Framework Applications ; Adsorption and biosorption for pollutant removal
Authors: R.NALINI SUJA NALINI | B.Sridevi | M.Chitra
Source: Indian Journal of Chemical Technology (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Determination of kinetic parameters and thermal decomposition of Epoxy-Moringa gum biocomposite using thermogravimetric analysis The use of natural filler based composites in various applications is growing due to easy availability and eco-friendly nature of the natural fillers. In the present study, an epoxy based bio composite has been prepared using Moringa oleifera gum as bio filler in order to investigate thermal properties. The composites have been prepared by incorporating Moringa oleifera gum at different volume fractions (4%, 8%, 12%, 16%, 20% v/v). Hand layup technique is used to fabricate the composite material. Fourier Transform Infrared Spectroscopy confirmed the formation of epoxy Moringa gum composite. Using thermogravimetric analysis data, activation energy and regression values (R2) for the second stage of epoxy Moringa composite degradation have been determined by Coats-Redfern integration methods which involves 13 different kinetic models. The energy of activation is in the range of 72 to 99 kJ/mol and frequency factor was in the range of 2.5x105 to 7.69x107 for second order model which was identified as the best fitted model with R2 value close to 1. The results are also compared with Broido and Horowitz-Metzger models. As the volume percentage of Moringa gum increases, the activation energy, frequency factor, enthalpy, entropy and Gibbs free energy also increases which proves the thermal stability of the Epoxy Moringa gum biocomposite is superior to the epoxy resin. Thus Moringa gum can be used as a potential bio filler to produce gum based composites having high thermal stability and can be promoted widely in various engineering applications. Thermogravimetric analysis ; Chemistry ; Biocomposite ; Thermal decomposition ; Epoxy ; Decomposition ; Kinetic energy ; Moringa ; Chemical engineering ; Nuclear chemistry ; Composite material ; Organic chemistry ; Composite number Thermal and Kinetic Analysis ; Moringa oleifera research and applications
Authors: Nidhika Kaundal | Pravin Kumar
Source: Journal of Drug Delivery and Therapeutics (article, 2024-05-15)
Field: Materials Science — Biomaterials

Formulation and Evaluation of Ethosomal Cream containing Resveratrol for the Treatment of Contact Dermatitis Objective: The aim of this study was to formulate and evaluate ethosomal cream containing resveratrol for the treatment of contact dermatitis. Method: Resveratrol-loaded ethosome was prepared using cold method. The prepared ethosomes were assessed for entrapment efficiency (%), TEM analysis and sedimentation rate to determine the optimal formulation for loading into cream base. The selected formulation was further investigated for particle size distribution and zeta potential. A cream base was formulated using fusion and trituration method and selected for loading with the ethosomal suspension, meeting specification suitable for topical delivery. Ethosomal cream formulations were evaluated for drug content, ex -vitro diffusion by using goat skin, skin retention, microbiological study and stability study. Result and Discussion: The formulation E3 was selected for loading in the optimized cream base (F4) to obtain a topical cream containing ethosomes of resveratrol. The release study reveals that release was controlled for the 24 hours. The drug release in buffer was less than 17% from all the formulations after 24 hours. The drug content of resveratrol in goat skin and cream remained in donor compartment indicates that the drug retention in skin was high in all the formulations, which is desirable for the topical formulations. The best possible release kinetics of the formulation loaded with resveratrol containing ethosomes was found to be zero order. The ‘n’ value from Peppas’s model indicated that the drug release was by Fickian diffusion. Stability study indicates that all the cream formulations were stable after a time period of one month. Conclusion: The present study conclusively supported that ethosomal cream containing resveratrol to be an advantageous topical drug delivery system in treatment of ACD. However detail in- vivo study should be conducted in future to be justify the in- vitro study. Keywords: Resveratrol, Ethosome, Cream, Contact dermatitis. Resveratrol ; Dermatology ; Contact dermatitis ; Medicine ; Pharmacology ; Allergy ; Immunology Silk-based biomaterials and applications
Authors: Zhenyu Jiang | Jun Xiong | Yuelong Pan | Jie Hu | Yujia Chen | Yin Shu-hua | Yihong Yan
Source: Frontiers in Energy Research (article, 2024-01-19)
Field: Chemistry — Inorganic Chemistry

Study on the actual particle size, activity concentration, and migration process adsorption behavior of radioactive substances in liquid effluents from nuclear power plants Radionuclides emitted by nuclear power plants may have effects on the environment and public health. At present, research on radioactive material effluent in the industry mainly focuses on the treatment of radioactive effluent and the particle size distribution of the primary circuit. There is little research on the particle size of radioactive material during the migration process outside the primary circuit system, as well as the flocculation precipitation and other enrichment phenomena during the collection process of effluent. Therefore, this study relies on the sampling of effluent from an in-service nuclear power plant to measure its radioactivity level by particle size range. At the same time, the mixing process of effluent is simulated in the laboratory to simulate the adsorption behavior of effluent during the migration process. It was found that in the activity concentration of detectable radioactive nuclides in the effluent samples, more than 95% of radioactive nuclides exist in the liquid with particle sizes less than 0.1μm, while particle sizes greater than 0.45 μm account for less than 5%. After the sample was filtered by the demineralizer, the radioactive activity decreased. The flocculation precipitation in the waste liquid of the waste water recovery system has a certain contribution to the enrichment of nuclides. With the extension of time, the enrichment of transition elements such as cobalt and manganese is particularly obvious, so that it is distributed in the liquid again with a large particle size. In addition, large particle size substances such as colloids in seawater have a certain adsorption effect on radionuclides, which will lead to its aggregation effect again. Effluent ; Nuclide ; Radionuclide ; Particle size ; Particle (ecology) ; Radioactive waste ; Chemistry ; Precipitation ; Adsorption ; Flocculation ; Environmental science ; Radiochemistry ; Waste management ; Environmental engineering ; Nuclear chemistry ; Nuclear physics ; Geology ; Physics Radioactive element chemistry and processing ; Graphite, nuclear technology, radiation studies ; Radioactivity and Radon Measurements
Authors: Nicholas Denomme | Ciria C. Hernández | Hailey A. Bock | Rachel Friedman Ohana | Shreeya Bakshi | Alexander M. Sherwood | John D. McCorvy | Paul F. Daley | Wyeth B. Callaway | Jacob M. Hull | Andrew Alt | Lori L. Isom | Nicholas V. Cozzi
Source: Molecular Pharmacology (article, 2024-05-31)
Field: Chemistry — Organic Chemistry

N-(4-Bromo-2,5-Dimethoxyphenethyl)-6-(4-Phenylbutoxy)Hexan-1-Amine (XOB): A Novel Phenylalkylamine Antagonist of Serotonin 2A Receptors and Voltage-Gated Sodium Channels Sodium channel ; Chemistry ; Antagonist ; Receptor ; Pharmacology ; Sodium ; Biochemistry ; Medicine Chemical synthesis and alkaloids
Authors: Rui Xi | Qiyang Jiang | Liang Cao | Chuping Li | Jiaxun He | Ya Zhang | Gaohui He | Yingang Gui | Chao Tang
Source: Energies (article, 2024-09-12)
Field: Materials Science — Materials Chemistry

Effects of Water Absorption on the Insulating Properties of Polypropylene Moisture has been a crucial problem during the operation of cable systems. When we are faced with polypropylene (PP)-based insulation for the development of cable systems, there are few reports on the effects of water intrusion on the electrical performances of PP. In this study, the water absorption characteristics of isotactic PP (iPP) and atactic PP (aPP), as well as their effects on volume resistivity and relative permittivity, were investigated. The structure evolution during the water absorption process of the two PPs was also compared via infrared spectra and X-ray diffraction analyses. The results show that both of the two PPs show a saturation of water absorption at ~216 h, even though there are structural differences. And water intrusion into bulk could increase the interplanar spacing of iPP while decreasing the interplanar spacing of aPP. Moreover, with the increase in water absorption, the volume resistivity of the two PPs show a decreasing trend while the relative permittivity presents an increasing behavior, which shows an almost linear correlation. Materials science ; Absorption of water ; Electrical resistivity and conductivity ; Permittivity ; Absorption (acoustics) ; Composite material ; Intrusion ; Polypropylene ; Moisture ; Relative permittivity ; Saturation (graph theory) ; Volume (thermodynamics) ; Tacticity ; Conductivity ; Dielectric ; Thermodynamics ; Chemistry ; Polymer ; Electrical engineering ; Optoelectronics ; Geology ; Mathematics ; Physics High voltage insulation and dielectric phenomena ; Dielectric materials and actuators ; Electrical Fault Detection and Protection
Authors: Yushan Zhang | Guang‐Ling Song | Yujie Mo | Shuwen Wang | Diyun Chen | Minhua Su
Source: Separations (article, 2024-12-26)
Field: Chemistry — Inorganic Chemistry

Irradiated Gao Miao Zi Bentonite for Uranium Retention: Performance and Mechanism Bentonite has been considered as backfill material in the long-term deep geological disposal sites for radioactive waste. The performance of raw and irradiated bentonite based on the retention of radioactive nuclides, such as U(VI), is a critical factor for its application. Herein, the intrinsic features and adsorption behavior of Gao Miao Zi (GMZ) bentonite based on uranyl ions was investigated. In aqueous solutions, bentonite can achieve an adsorption rate of up to 100% for U(VI). The primary mechanism of U(VI) adsorption by GMZ bentonite is ion exchange, supplemented by surface complexation. Strong irradiation can introduce slight structural changes and framework fractures in bentonite, reducing its adsorption capacity for U(VI). This study provides an in-depth analysis of the adverse effects of high doses of radiation (100 kGy) on the microstructure and adsorption properties of bentonite, offering important insights for the safe storage of radioactive waste. Bentonite ; Uranium ; Mechanism (biology) ; Geology ; Chemistry ; Radiochemistry ; Geochemistry ; Mineralogy ; Materials science ; Geotechnical engineering ; Physics ; Metallurgy Radioactive element chemistry and processing ; Chemical Synthesis and Characterization ; Clay minerals and soil interactions
Authors: Jonathan A. Brassard | D. Saleth Sidharthan | Hamid Ebrahimi Orimi | Daria Vdovenko | Yannick Rioux | Hanwen Wang | Kurtis Champion | Florent Lemaire | Brenden N. Moeun | Jia Zhao | Shenghui Liang | Timothy J. Kieffer | Jean Tchervenkov | Gilles Soulez | André Bégin‐Drolet | Jean Ruel | Richard L. Leask | Steven Paraskevas | Corinne A. Hoesli
Source: bioRxiv (Cold Spring Harbor Laboratory) (preprint, 2024-10-01)
Field: Materials Science — Biomaterials

Iterative sacrificial 3D printing and polymer casting to create complex vascular grafts and multi-compartment bioartificial organs ABSTRACT Several emerging strategies to engineer artificial organs employ 3D printing to create vascular templates to provide nutrients and oxygen to immobilized cells. Significant challenges emerge when considering clinical implementation such as immune rejection of allogeneic cell sources, as well as achieving adequate perfusion and integration with endogenous vasculature. We propose a method by which cell-laden hydrogels are molded around ready-made polymeric vascular templates created via 3D printing to create human-scale artificial organs with internal vasculature. We applied this technique to create bioartificial pancreas systems with up to 9 internal flow channels via sacrificial carbohydrate glass 3D printing, porogen-loaded polycarbonate polyurethane dip-coating, followed by casting cell-laden hydrogels around the vascular templates. We optimized porogen size and concentration to maximise the porosity of our scaffolds without compromising mechanical properties, resulting in suture retention strength and compliance respectively matching commercial vascular grafts and native vessels. Bioreactor perfusion studies showed survival and maturation of stem cell derived pancreatic islets without significant differences to traditional suspension culture protocols. Insulin response dynamics were rapid in response to a glucose challenge at the perfusion inlet. Transplantation of the devices as iliac arteriovenous shunts in nondiabetic pigs confirmed safety and patency. These results show promise for the development of an implantable vascularized pancreas for the treatment of type 1 diabetes and demonstrate how bioartificial organs with engineered vascular geometries can be designed for translational applications. Compartment (ship) ; Tissue engineering ; Materials science ; Casting ; Biomedical engineering ; Computer science ; Engineering ; Geology ; Composite material Electrospun Nanofibers in Biomedical Applications
Authors: Hasbullah Panggabean | Selamat Triono Ahmad | Sukardi Sukardi | Yahfizham Yahfizham | Muhammad Thahir
Source: Journal of Fibers and Polymer Composites (article, 2024-03-20)
Field: Materials Science — Biomaterials

Bacterial Cellulose Powder as A Filler in a Matrix Composite from Oil Palm Trunk The paper is to reveal the bacterial cellulose powder as a filler for a composite matrix with an oil palm trunk. The use of oil palm trunks is excellent because of their abundant availability and because they can reduce waste. It is low-density, environmentally friendly, inexpensive, non-toxic, and easily degraded as a matrix that produces hydrogels obtained from cross-linking. This research is a laboratory experiment that makes films by masks using the bacterial cellulose powder obtained through enzyme hydrolysis fillers with the addition of 1%, 2%, 3%, 4%, and 5%. Bio-composite films are readily biodegradable, so the films made from extracting oil palm trunks with stem starch are environmentally friendly. The pH value of the five preparations for film gel masks was the shelf life of bio-composite, which could last for 21 days. Characterization of film masks includes physical properties and analysis of chemical composition, where the amount of water in the film will decrease as the size of the polymer that makes up the film matrix increases. The treatment that produced bio-composite films with the best mechanical properties under the addition of bacterial cellulose powder was 3% filler. The cellulose bacterium can be applied as a filler for making composites by modifying the oil palm trunk as a matrix composite. Palm oil ; Composite number ; Filler (materials) ; Composite material ; Cellulose ; Materials science ; Bacterial cellulose ; Matrix (chemical analysis) ; Palm ; Pulp and paper industry ; Food science ; Chemistry ; Organic chemistry ; Engineering Advanced Cellulose Research Studies ; Natural Products and Applications ; Nanocomposite Films for Food Packaging