Subjects -> CHEMISTRY (Total: 1021 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (746 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (49 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (746 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal  
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 36)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 14)
ACS Catalysis     Hybrid Journal   (Followers: 76)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 25)
ACS Combinatorial Science     Hybrid Journal   (Followers: 25)
ACS Macro Letters     Hybrid Journal   (Followers: 34)
ACS Materials Letters     Open Access   (Followers: 3)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 49)
ACS Nano     Hybrid Journal   (Followers: 448)
ACS Photonics     Hybrid Journal   (Followers: 19)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 40)
Acta Chemica Iasi     Open Access   (Followers: 8)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 81)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 15)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 14)
Advanced Science Focus     Free   (Followers: 7)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 108)
Advances in Chemical Science     Open Access   (Followers: 50)
Advances in Chemistry     Open Access   (Followers: 39)
Advances in Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 21)
Advances in Drug Research     Full-text available via subscription   (Followers: 27)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 13)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 20)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 35)
Advances in Nanoparticles     Open Access   (Followers: 20)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 20)
Advances in Polymer Science     Hybrid Journal   (Followers: 53)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 22)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 7)
Advances in Science and Technology     Full-text available via subscription   (Followers: 17)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Aggregate     Open Access   (Followers: 3)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 3)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 5)
Alchemy : Jurnal Penelitian Kimia     Open Access   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 71)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 24)
American Journal of Chemistry     Open Access   (Followers: 41)
American Journal of Plant Physiology     Open Access   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 40)
Analytical Science Advances     Open Access   (Followers: 2)
Angewandte Chemie     Hybrid Journal   (Followers: 235)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 353)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 8)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 6)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 13)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 16)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 12)
Applied Spectroscopy     Full-text available via subscription   (Followers: 27)
Applied Surface Science     Hybrid Journal   (Followers: 33)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access   (Followers: 2)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 3)
Atomization and Sprays     Full-text available via subscription   (Followers: 8)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 484)
Biochemistry Insights     Open Access   (Followers: 7)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 3)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 4)
Biomacromolecules     Hybrid Journal   (Followers: 27)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 4)
BioNanoScience     Partially Free   (Followers: 6)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 213)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 88)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 4)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 26)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 13)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
Carbohydrate Polymer Technologies and Applications     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 13)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 76)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 13)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 14)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 17)
Cereal Chemistry     Full-text available via subscription   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 11)
Chemical and Engineering News     Free   (Followers: 25)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 88)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 28)
Chemical Physics Letters : X     Open Access   (Followers: 4)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 25)
Chemical Reviews     Hybrid Journal   (Followers: 265)
Chemical Science     Open Access   (Followers: 44)
Chemical Science International Journal     Open Access   (Followers: 1)
Chemical Technology     Open Access   (Followers: 71)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 23)
ChemInform     Hybrid Journal   (Followers: 9)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 31)
Chemistry & Industry     Full-text available via subscription   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 224)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 24)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry Education Research and Practice     Free   (Followers: 8)
Chemistry Education Review     Open Access   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry Letters     Full-text available via subscription   (Followers: 49)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 336)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 14)
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access   (Followers: 1)
ChemSystemsChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 13)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 5)
Ciencia     Open Access   (Followers: 1)
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 12)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 24)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Colloid and Polymer Science
Journal Prestige (SJR): 0.597
Citation Impact (citeScore): 2
Number of Followers: 12  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0303-402X - ISSN (Online) 1435-1536
Published by Springer-Verlag Homepage  [2658 journals]
  • Correction to: Wormlike micelles formed by ultra‑long‑chain
           nonionic surfactant

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      PubDate: 2021-10-01
       
  • Correction to: Application of chain transfer agents in the two‑part
           dispersion polymerization of cross‑linked polymer microspheres

    • Free pre-print version: Loading...

      PubDate: 2021-10-01
       
  • Hyperbranched polyethylenimine–based polymeric nanoparticles: synthesis,
           properties, and an application in selective response to copper ion

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      Abstract: Hyperbranched polyethylenimines (hPEIs) have diverse biological applications; however, the intrinsic toxicity is a major concern in developing hPEI-based biomaterials. This work reports the synthesis, properties, and an application as a biocompatible hPEI-based material, namely, fluorescent oxidized hPEI polymeric nanoparticles (F-ohPEIs). The synthesis was achieved through oxidation of hPEI with H2O2 and subsequent cross-linking with formaldehyde, imparting to F-ohPEIs’ desired properties such as remarkably reduced positive charge density, hydrolytic degradability, low cytotoxicity, strong fluorescence emission, and stability. Furthermore, as an application, F-ohPEI demonstrated the ability to selectively respond to cupric ion in a wide concentration range of 0.02 ~ 10 μM with a low limit of detection of 0.013 μM. The synthesis strategy along with the F-ohPEI nanoparticles developed in this work is expected to find promising application in fabricating biocompatible hPEI-based biomaterials. Graphical abstract
      PubDate: 2021-10-01
       
  • Homogeneous rhodium ion catalyst encapsulated by benzoyl-terminated
           dendrimer: high hydrogenation and separation capabilities for diene
           copolymers

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      Abstract: Benzoyl chloride has been employed to react with primary amino groups on the surface of the second generation of poly(propylene imine) (G2-PPI) dendrimer to synthesize benzoyl-terminated dendrimer (G2-B) by a nucleophilic substitution reaction. A novel homogeneous catalyst of G2-B(Rh3+) has been prepared by complexing RhCl3·3H2O with G2-B, and further applied to the catalytic hydrogenation of nitrile butadiene rubber (NBR) and styrene butadiene rubber (SBR). The hydrogenation degrees (HDs) of HNBR and HSBR catalyzed by G2-B(Rh3+) are 99.2 and 92.1% respectively. The contents of Rh residue in the HNBR and HSBR catalyzed by G2-B(Rh3+) are only 41 and 31 ppm, respectively, which are respectively decreased by 84.5 wt% and 83.2 wt%, respectively, compared to those catalyzed by RhCl(PPh3)3.
      PubDate: 2021-10-01
       
  • Laccase-like nanozymes fabricated by copper and tannic acid for removing
           malachite green from aqueous solution

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      Abstract: Seeking simple, green, and inexpensive preparation methods and materials of enzyme mimics has always been highly desirable. In this paper, a nanocomposite with laccase activity was successfully fabricated by using a simple self-association method with copper and tannic acid. Characterizations through SEM, XRD, FTIR, and XPS showed that the Cu-TA hybrid composites had good spherical in shape with a diameter of about 20 nm and three different valence Cu ions (Cu2+, Cu+, and Cu0). The catalytic activity was displayed against typical oxidation substrate of laccases, 2,4-DP. Compared to natural laccases, Cu-TA composites were able to better tolerate changes of pH, temperature, ionic strength, and storage conditions. The Cu-TA composites could remove malachite green (MG) from aqueous solutions effectively. The removal efficiency of MG was optimized using a series of batch tests with single-factor experiment design. Under the optimum conditions, the removal efficiency of MG still retained about 90% after 3 times cycles. Therefore, the Cu-TA composites, as a laccases-like nanozyme, have excellent developing potential in wastewater treatment due to the low-cost of TA and simplicity of preparation.
      PubDate: 2021-10-01
       
  • Evaluation of critical packing parameter in the series of polytyrosine-PEG
           amphiphilic copolymers

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      Abstract: Here, we report on the evaluation of critical packing parameters, PC, of l-tyrosine and ethylene glycol (PEG) amphiphilic block copolymers. The copolymers were synthesized via l-tyrosine-N-carboxyanhydride ring-opening polymerization using different amino-terminated PEGs as macroinitiators. The size and shape of their associates formed in water were investigated by transmission electron microscopy and dynamic and static light scatterings. The copolymers containing 20–30 wt. % of Tyr formed rod-like micelles. The copolymers with 30–50 wt. % of Tyr formed spherical vesicles, while those with 50–80 wt. % Tyr formed irregularly shaped polymeric nanoparticles. PC of the copolymers was estimated as the ratio of the van der Waals volume of the hydrophobic block (V) to its length (L) and the cross-sectional area of the polar block (SH). The values of SH for each copolymer were calculated according to the equation obtained from the correlation analysis of the published data. The hydrophobic block length L was calculated in three ways, i.e., assuming that polytyrosine adopts (1) stretched, (2) amyloid hairpin, or (3) Gaussian coil conformation. In the latter case, the best match of the calculated PC values with the morphology of the copolymer assemblies was observed. Graphical abstract
      PubDate: 2021-10-01
       
  • Casein-pectin nanocomplexes as a potential oral delivery system for
           improving stability and bioactivity of curcumin

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      Abstract: New nanocomplexes containing curcumin-loaded casein micelles and surface-coated pectin via electrostatic interaction were fabricated. Curcumin-loaded nanocomplexes prepared at pH 4 showed the most excellent performance than that at pH 3 and pH 2, which had an average size of 266.4 nm (polydispersity index = 0.193) and loading capacity of 93%. The morphology of nanocomplexes exhibited as monodisperse spherical nanoparticles observed by SEM and TEM. The experiment of anti-oxidant activity demonstrated that nanocomplexes tremendously kept the bioactivity of curcumin. Moreover, in vitro release behaviors of curcumin from casein-pectin nanocomplexes indicated that the surface coating layer of pectin obviously delayed the release of curcumin in simulated gastric fluid, and the controlled release ability in simulated intestinal fluid was greatly enhanced. The casein-pectin nanocomplexes exhibited as a promising oral delivery vehicle of bioactive ingredients in food and pharmacy. Graphical abstract
      PubDate: 2021-10-01
       
  • Rotational and translational diffusion of colloidal ellipsoids in bulk and
           at surfaces

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      Abstract: We studied the diffusion of ellipsoidal colloids by using a combination of single-particle tracking (SPT) and differential dynamic microscopy (DDM). The micrometer-sized polystyrene particles have an aspect ratio of ≈ 4.3. SPT provides the particle trajectories and translation diffusion coefficient of the particles. DDM analyses appropriate for anisotropic particles were then used to extract the rotational diffusion coefficient of the particles. The results matched well with the theoretical prediction of translational and rotational diffusion coefficients for ellipsoids in the bulk. We extended our method to surface bound particles, which shows that rotation slowed by a larger amount compared to translation. This can be explained qualitatively by assuming heterogeneity of viscous and hydrodynamic forces experienced by surface bound particles. The research will be useful to study the viscous friction experienced by anisotropic colloids in complex fluids and surface friction at chemically or topologically modified substrates.
      PubDate: 2021-10-01
       
  • Water-soluble polymer-induced drag reduction and flow patterns for
           oil–water flows in return bend

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      Abstract: Drag reduction (DR) by additives in single- and two-phase fluid transport has enormous engineering and economic benefits. An ample amount of work has been done with regards to understanding the mechanism of DR for developed flows in straight conduits. There is however a limited understanding of the effects of drag-reducing agents (DRAs) on under-developed flows in bends and more so for liquid–liquid two-phase flows in and around the bend. This study therefore investigates the influence of U-bend on polymer drag reduction and flow patterns for oil–water two-phase flows. The ranges for oil and water superficial velocities tested were \(0.04\le {U}_{so}\le 0.950 {m}/{s}\) and \(0.13\le {U}_{sw}\le 1.10 {m}/{s}\) , respectively. The test section consists of \(19-{mm}\) ID clear polyvinyl chloride straight tubes and return bend ( \(R=100 {mm}\) ). Measurements were carried out for developed flow upstream of the bend, at the U-bend and at two under-developed flow sub-sections downstream of the bend. The addition of polymer imposed partial or complete flow stratification in all test sections. In all test sections, drag reduction increased with flow rate of water and reduced with oil fraction in the region of strong turbulence. For high mixture velocities, DR upstream of the bend was highest while the least was recorded at the bend. The highest DR upstream of the bend, in the U-bend and at the two downstream under-developed flow sub-sections were 40%, 34%, 28%, and 29%, respectively.
      PubDate: 2021-10-01
       
  • A comparative study of clay enriched polymer solutions for effective
           carbon storage and utilization (CSU) in saline reservoirs

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      Abstract: In this study, a comparative study of polymeric (Xanthan Gum, XG and polyacrylamide, PAM) clay nanofluids has been explored for increasing CO2 retention and storage efficacy in a synthesized porous media prepared using sand grains of uniform size (200–380 µm). The clay nanofluids were extensively characterized to establish the average particle size of suspended NP clusters (with and without 4 wt% sodium chloride, NaCl) and viscosity at test temperatures (30–90 °C). The inclusion of salt promoted rapid agglomeration of NPs leading to the formation of large size NP clusters of size 1124–1480 nm (an increase in 3–fourfold). Nanofluids exhibited shear-thinning nature while increasing NP concentration caused an increase in nanofluid viscosity. The carbon retention studies were performed in sand-packs by injecting gas slug behind water and nanofluid to establish the duration of time to breakthrough and the amount of carbon retained before breakthrough. Since the gas injection rate was 1 ml/min, the time to breakthrough also denotes the amount of gas retained inside the sand-pack (before breakthrough). With both polymers (PAM and XG), viscous fingering with insufficient CO2 storage (42–44 ml) was observed. However, clay nanofluids suggested higher volume of CO2 storage (63–101 ml) in porous media.
      PubDate: 2021-10-01
       
  • Peroxidase-like reaction by a synergistic inorganic catalyst colloid: a
           new method for hydrogen peroxide detecting in air samples

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      Abstract: A peroxidase-like catalyst of a synergistic inorganic nanocomposite was firstly proposed for the occupational exposure monitoring of H2O2. Nano-zeolite Y (nZY) ion exchange of copper (nZY-Cu) is also used as a peroxidase-like catalyst. In this study, the catalyst component was characterized using X-ray diffraction, BET method, XRF, and scanning electron microscopy. In addition, relative activity was used to show the synergistic peroxidase-like activity of nZY-Cu. Thereafter, the central composite design was applied for the parameter optimization of 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation. However, a method was developed for the TMB-H2O2 reaction using nZY-Cu. The catalytic activity of copper increased in nZY-Cu under the pH of 4.58, with 0.32 mg of catalyst, and TMB concentration of 10.57 μM. Accordingly, a simple and sensitive method was set up for the detection of H2O2 in the air samples, with a linear range of 0.5 to 60 ppm, the detection limit of 0.15 ppm, and a recovery level of 94.13 ± 6.5. The proposed method showed a compatible precision with standard method (OSHAVI-6) according to RSDs.
      PubDate: 2021-10-01
       
  • Effect of chain rigidity on morphological transformation and adsorption
           behaviors of biocompatible polyoxyethylene-based surfactants at
           water–air surface

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      Abstract: Novel biocompatible acrylpimaric acid– and polyoxyethylene-based surfactant was prepared in our laboratory. Moreover, the influence of chain rigidity on the morphological transformation and adsorption behaviors of polyoxyethylene acrylpimaric acid copolymer and marketed polyethylene-polypropylene glycol (F188) surfactants was evaluated. The adsorption behaviors including critical micelle concentration (CMC), morphological change, and adsorption capacity were investigated. Reorientation theory was put forward to depict the adsorption and the morphological transformation for these two kinds of polyoxyethylene-based surfactants at water and air surface. The solvent molar fraction decreased and that of surfactant molecules increased as polyester concentration increased. The amounts of state 1 and state 2 surfactants adsorbing on the surface were calculated. The free energy of adsorption is far less than the energy of micellar formation. The consequences are helpful to illustrate the chain rigidity effect on adsorption behaviors and to expand in the formulation of micelles.
      PubDate: 2021-09-29
       
  • Ion-partitioning effects on electrokinetic flow of generalized Maxwell
           fluids through polyelectrolyte layer-coated nanopore under AC electric
           field

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      Abstract: The article dealt with an analytic study on the electroosmotic flow and mass transport of an electro neutral solute through polyelectrolyte layer (PEL)-coated canonical nanopore under the imposed alternative current electric field for Maxwell fluids. The PEL of uniform thickness contains positive charge density, while surface potential of nanopore is negatively charged. The permittivities of the electrolyte solution and PEL are assumed to be different which creates the ion-partitioning effects. The Born formula is incorporated to account the ion-partitioning effects. For low surface charge, the distribution of the ionic species are governed by the modified Boltzmann distribution and using the Debye–Hückel approximation, linearized Poisson–Boltzmann equation gives the distribution of induce potential inside and outside of the PEL. The modified Cauchy momentum equation with the Maxwell constitutive equation is used for the fluid flow distribution interior and exterior of the PEL. The analytic solutions for the distribution of induced potential and axial velocity are established using modified Bessel function for the Maxwell fluid. The importance of the bulk ionic concentration, oscillating Reynolds number, PEL fixed charge density, relaxation time, permittivity ratio between PEL and electrolyte solution and softness parameter is studied in this investigation. The convection–diffusion equation is considered to transport of neutral solute between two reservoirs, connected with nanopore. An analytic solution for the distribution of solute concentration is also presented. The effects of the flow characteristics on volumetric flow rate, average mass transport, and neutralization factor are described in this study.
      PubDate: 2021-09-29
       
  • Skin bioinspired anti-ultraviolet melanin/TiO2 nanoparticles without
           penetration for efficient broad-spectrum sunscreen

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      Abstract: Organic filters in traditional sunscreens usually are limited photodegradation and easily penetrate the stratum corneum and epidermal layer, leading to potential harmful effects. Melanin is a natural ubiquitous pigment that protects living organisms from intense sunlight. Inspired by the structure and function of the mussel adhesive protein, a facile strategy involving oxidative polymerization of dopamine was proposed for surface modification of titanium dioxide (TiO2) to obtain melanin/TiO2 nanoparticles. The thickness of melanin layers was varied from 1 to 7 nm by changing pH and dopamine concentration. The melanin/TiO2 nanoparticles with 1-nm-thick melanin layers showed highly efficient UV-shielding ability due to synergistic effect of melanin and TiO2. The melanin/TiO2 nanoparticles were introduced as the sole active ingredient to formulating sunscreen; sun protection factor (SPF) could reach 116.9 and 162.4 with a loading of 10 wt% and 15 wt%, respectively. Most importantly, melanin exhibits a good bioadhesion property and can effectively prevent the penetration of melanin/TiO2 nanoparticles. Thus, the as-prepared nanoparticles possess excellent UV-shielding capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen. Graphical abstract Inspired by the structure and function of the mussel adhesive protein, a facile strategy involving oxidative polymerization of dopamine was proposed for surface modification of titanium dioxide (TiO2) to obtain melanin/TiO2 nanoparticles. The melanin/TiO2 nanoparticles with 1-nm-thick melanin layers showed highly efficient UV-shielding ability due to synergistic effect of melanin and TiO2. Most importantly, melanin exhibits a good bioadhesion property and can effectively prevent the penetration of melanin/TiO2 nanoparticles. Thus, the as-prepared nanoparticles possess excellent UV-shielding capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen.
      PubDate: 2021-09-29
       
  • Preparation and characterization of a novel polyurethane/polyurethane
           modified graphene oxide composites

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      Abstract: Polyurethane-functionalized graphene oxide (MGO) was fabricated by surface modification of graphene oxide (GO) with a self-made waterborne polyurethane. MGO/polyurethane (MGO/PU) elastomer was produced by in situ polymerization. The structure and properties of GO and MGO and their effect on polyurethane elastomer were investigated. The results show that after the waterborne polyurethane successfully grafted and modified, the ordered crystal structure of GO transforms into the disordered structure, as well as its interlayer spacing becomes larger and the lipophilicity of GO improves greatly. The addition of MGO could promote the formation of hydrogen bonding of the PU and reduce the breaking speed of the hydrogen bonding. In addition, the results of thermogravimetric analysis and temperature-dependent mechanical properties indicate that the thermal stability and mechanical properties of MGO/PU are better than PU and GO/PU. Graphical abstract
      PubDate: 2021-09-23
       
  • Orientational screening of ssDNA-templated silver nanoclusters and
           application for bleomycin assay

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      Abstract: Orientational screening is a recently proposed strategy for the selection of DNA templates for silver nanoclusters (AgNCs). The feasibility of this strategy is facilitated by the accumulated experience of synthesizing DNA-templated AgNCs. Herein, a single-stranded DNA template of endowing AgNCs with high brightness (QY = 27.99%) was obtained through an orientational screening process. It was also found that double-stranded DNA rich in GC base pairs could also serve as synthesizing template for AgNCs. A facile method was then developed for the facile assay of bleomycin that might be added in illegally pronouncing products due to its low price and easy accessibility. The detection limit of this method was as low as 4.27 nM, with high sensitivity and good selectivity.
      PubDate: 2021-09-08
      DOI: 10.1007/s00396-021-04890-x
       
  • Influence of alkyl polyglucoside on physicochemical characteristics and in
           vitro studies of ibuprofen-loaded nanoemulsion formulations

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      Abstract: This research aims to investigate the influence of alkyl polyglucoside (APG) as a co-surfactant in nanoemulsion formulation containing ibuprofen, as a model drug, which intended to be used for topical application. Phase behavior of oil/surfactant/water system containing ibuprofen with different surfactants Cremophor EL(CrEL)/APG ratios (9:1, 8:2, and 6:4) was investigated. The results showed the system with CrEL: APG ratio 9:1 gives the largest isotropic region. When compared to the nanoemulsion formulation with and without APG, it showed that the system with APG exhibited higher emulsifying ability than CrEL surfactant alone which due to the APG co-surfactant could decrease the water affinity and increase the oil affinity of the systems. Several formulations with different surfactant-to-oil (S:O) ratios (1:9 and 9:1) were prepared. The result showed that the formulation containing the S:O ratio of 9:1 exhibited smaller and monodisperse particle sizes than the formulation containing the S:O ratio of 1:9 and it was selected for the preparation of nanoemulsion formulations. The particle size ranged between 20 and 200 nm and a polydispersity index less than 0.25 was obtained. Cytotoxicity results showed that no cytotoxicity effect (IC50 > 500 μg/mL) against 3T3 cell lines for both formulations (with and without APG) with reduced drug release when APG-corporate in nanoemulsion formulation. This shows that APG could be used as alternative stabilizing agent and the formulated nanoemulsion system could be used as a new topical drug carrier system for pharmaceutical applications.
      PubDate: 2021-09-08
      DOI: 10.1007/s00396-021-04889-4
       
  • Correction to: Probing the protein corona around charged macromolecules:
           interpretation of isothermal titration calorimetry by binding models and
           computer simulations

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      PubDate: 2021-09-04
      DOI: 10.1007/s00396-021-04861-2
       
  • Altering of lower critical solution temperature of environmentally
           responsive poly (N-isopropylacrylamide-co-acrylic acid-co-vanillin
           acrylate) affected by acrylic acid, vanillin acrylate, and
           post-polymerization modification

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      Abstract: For the improvement of poly (N-isopropylacrylamide) properties, new series of poly (N-isopropylacrylamide-Co-acrylic acid-Co-vanillin acrylate) terpolymer was fabricated with molar concentrations 5, 10, and 15 mol% of acrylic acid (AA) with 10 mol% of vanillin acrylate (VA). Monomer and polymers were chemically evaluated using (1H NMR, 13C, FT-IR, and UV); all structures emphasized logical results. The post-polymerization has been done for terpolymer with tryptophan and threonine; they were chemically investigated. Polymers and post-polymers have been physically characterized using SEM, X-ray, DSC, TGA, and SEM. Lower critical solution temperature was measured using turbidity by UV–VIS spectroscopy and by micro-DSC. These polymers will be used in the post-polymerization of many biomolecules for biomedical applications Graphical abstract
      PubDate: 2021-09-03
      DOI: 10.1007/s00396-021-04882-x
       
  • Tunable safranine T release from LbL films of single/blend polyanions

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      Abstract: Loading and release behavior of a cationic dye, namely, safranine-T, through layer-by-layer (LbL) multilayered films of poly(diallyldimethylammonium chloride) (PDADMAC) and single/blend anionic polyelectrolytes (PEs), namely, poly(acrylic acid) (PAA), and poly(styrenesulfonate) (PSS), are described. The growths of PDADMAC/PSS-PAA multilayers and their safranine-T sorption behavior are monitored using the UV–Vis technique and discussed in terms of blend composition of anionic PEs and pH as well as their hydrophilicity and topography. The dye loading and desorption properties of the LbL films prepared from single/blend negatively charged PEs mainly depend on the interactions of PEs and safranine T. Strong interactions between PSS and safranine T result in a higher dye entrapping inside LbL films whereas either PAA-rich or single PAA-based LbL film exhibits larger dye desorption. A higher PSS content in the feed blend composition leads to an observable increase in θave and surface roughness whereas the use of PAA can yield a flatter surface due to its partially recomposed chain conformational structure at pH 11. Consequently, LbL multilayers obtained from single and blend polyanions can be considered as an encouraging material platform for the controlled release of charged species such as protein, drug, and dye. because of their tunable physicochemical and morphological properties as well as surface wettability. Graphical abstract
      PubDate: 2021-09-02
      DOI: 10.1007/s00396-021-04883-w
       
 
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