bluuebunny/crossref_metadata_2025_split huggingface dataset:
Visible light photocatalytic degradation of organic dyes using W‐modified TiO2/SiO2 catalyst
Authors: Van Hung Nguyen , Nguyet Bui Thi Minh , Nghi Nguyen Huu , Nguyen Vo Thang , Binh Thai Vu , Tu Nguyen Thi Thanh , Dung Nguyen Nho , Khieu Dinh Quang 
Published: March 2024

AbstractIn the present study, the synthesis of W‐modified TiO2/SiO2 composite and its catalytic activity in the visible light region is demonstrated. The W‐modified TiO2/SiO2 composite was obtained from the hydrolysis of a mixture containing titanium (IV) oxysulfate, ammonium metatungstate, and SiO2 powder in an alkaline medium. The obtained materials were characterized by using X‐ray diffraction (XRD), Fourier transformation‐infrared spectroscopy (FT‐IR), high‐resolution transmission electron microscopy (HRTEM), energy dispersive X‐ray elemental mapping observation, nitrogen adsorption/desorption isotherms, photoluminescence spectra (PL), and ultraviolet visible diffusive reflectance spectroscopy (UV‐Vis DRS). In this material, W‐modified TiO2 nanoparticles of about 3‐5 nm were highly dispersed on the silica network. Both W‐modified TiO2 and W‐modified TiO2 decorated on the SiO2 substrate significantly promoted the visible light absorption of the material. The photocatalytic activity of the prepared catalyst was assessed through the photodegradation of Methylene blue, Rhodamine‐B, Methyl orange, and Congo red dyes under visible light illumination. It was found that the kinetic and equilibrium data of the photocatalytic process fitted the modified Langmuir‐Hinshelwood model well. Recyclable studies have shown that the catalyst still retained its original activity after the third cycle.
A new meroterpene lactone and a new alkyl amino alcohol from the Vietnamese marine sponge Hippospongia fistulosa Lendenfeld, 1889
Authors: Hang Dan Thi Thuy , Trang Do Thi , Yen Pham Hai , Cuc Nguyen Thi , Dung Duong Thi , Tai Bui Huu , Nhiem Nguyen Xuan , Van Kiem Phan 
Published: March 2024

AbstractFrom the methanol extract of the marine sponge Hippospongia fistulosa Lendenfeld, 1889, a new meroterpene lactone named as hippolactone A (1), a new alkyl amino alcohol named as 2‐aminotetradec‐13‐ene‐3,4,5,6,7‐pentaol (2), and three known meroterpenes, polyfibrospongol A (3), polyfibrospongol B (4), and 19‐hydroxy‐polyfibrospongol B (5), were isolated. Their structures were elucidated by extensive spectroscopic analyses including IR, HR‐ESI‐MS, 1D and 2D NMR, and by comparison of the spectral data with those of previously reported data. Compounds 1 and 2 exhibited cytotoxic effects on Hep‐G2, MCF‐7, SK‐LU‐1, and SK‐Mel‐2 human cancer cells with percentages of dead cells in the range from 18.2±1.1 % to 43.4±1.6 %.
Cytotoxic and antimicrobial benzodiazepine and phenolic metabolites from Aspergillus ostianusIMBC‐NMTP03
Authors: Quang Tran Hong , Anh Le Ngoc , Hanh Tran Thi Hong , Cuong Nguyen Xuan , Ngan Nguyen Thi Thanh , Trung Nguyen Quang , Nam Nguyen Hoai 
Published: March 2024

AbstractSix benzodiazepine alkaloids and two phenolics were isolated from an ethyl acetate extract of the fungal strain Aspergillus ostianus IMBC‐NMTP03 fermentation culture. Their chemical structures were elucidated as circumdatins D (1), E (2), J (3), and I (4), cycloanthranilylproline (5), and (11aS)‐2,3‐dihydro‐7‐methoxy‐1H‐pyrrolo[2,1‐c][1,4]benzodiazepine‐5,11(10H,11aH)‐dione (6), 4‐hydroxybenzoic acid (7), and syringaldehyde (8) by spectroscopic methods, including 1D and 2D NMR and mass spectra in comparison with the literature data. Compounds 2, 4, and 5 showed cytotoxicity toward KB, MCF‐7, and LNCaP cancer cell lines (41.14‐49.76 % cell death) while 7 was cytotoxic against HL‐60, KB and LNCaP cells (41.77‐47.06 % cell death). Compounds 1‐3 and 5‐8 displayed antimicrobial activity against Enterococcus faecalis and Candida albicans, with MIC values ranging from 18.7‐100 μM.
Rate enhancement of ‘in water’ organic transformation by anionic‐nonionic mixed micelle
Authors: Rakshit Atanu , Chowdhury Suman , Acharjee Animesh , Saha Bidyut 
Published: March 2024

AbstractMicellar medium has already promising uses in organic transformations. In the present experiment, mixture of anionic and neutral surfactants (SDS and TX‐100 respectively) has been discovered as a good reaction medium for the organic transformations. The kinetics of propanal oxidation by Cr(VI) has been studied in mixed micellar medium spectrophotometrically maintaining pseudo first order reaction condition at 30 °C. The kinetics of the same reactions promoted by three hetero‐aromatic bases (Phen, PA and Bpy) have already been studied in single as well as mixed micellar medium. The valid spectroscopic evidence of formation of the product and mixed micelle formation have been provided with necessary mechanistic pathways.
Study on preparation of pregna‐4‐en‐17α,21‐diol‐3,20‐dione from androst‐4‐en‐3,17‐dione
Authors: Huy Luu Duc , Tu Duong N. , Diep Nguyen T. , Khanh Ho V. , Kazantsev A. V. , Savinova T. S. 
Published: March 2024

AbstractAn efficient procedure was proposed for the preparation of pregna‐4‐en‐17α,21‐diol‐3,20‐dioneby using nitrile method to result in high yield up to 56.0‐57.0 % from androst‐4‐en‐3,20‐dione, a key intermediate for producing corticoids.
A review on application of marine algae as green corrosion inhibitors in acid medium
Authors: Ismail Nabilah , Mujad Siti Mariana , Zulkifli Mohammad Fakhratul Ridwan , Izionworu Vincent Onuegbu , Ghazali Mariyam Jameelah , Nik Wan Mohd Norsani Wan 
Published: March 2024

AbstractCorrosion is significant and continuous issue that causes serious problem on environment, properties, our lives and leads to economic losses. So, prevention of corrosion requires more attention. Metal corrosion inhibitors, both inorganic and synthetic, are used to prevent and slow down corrosion, although these inhibitors are hazardous. Thus, green corrosion inhibitors which both environmentally and economically are likely the solution to this problem. A lot of research has been done to discover good corrosion inhibitors from natural sources. Marine algae is one of the most valuable sources of natural marine products because of its ability to survive in the dynamic environment of the ocean and considered a natural source for corrosion inhibition. In this review, various species of marine algae are discussed as green corrosion inhibitors in terms of secondary metabolites, mechanism of inhibition, and methodologies used to evaluate the corrosion rate of different metals in acidic media.
Determination of seven parabens in surface water samples by UHPLC‐MS/MS and solid‐phase extraction
Authors: Thuy Quan Cam , Phuong Pham Thi , Thien Tran Lam Thanh , Minh Bui Quang 
Published: March 2024

AbstractParabens are considered one of the ideal preservatives in numerous consumer products due to their high antimicrobial properties. Nevertheless, parabens have the following potentially detrimental effects on human health such as adverse effects on male reproductive system, or accelerated skin aging process and breast cancer. Here, ultra‐high performance liquid chromatography (UHPLC) coupled with a triple quadrupole mass spectrometry (MS/MS) combined with a solid‐phase extraction procedure was optimized for measuring seven parabens in surface water and proposed as a modified analytical method. The optimized protocol was validated according to the requirements of European standard SANTE/12682/2019. The limits of detection and quantification of the method obtained were 0.04 and 0.82 ng L‐1, respectively. The validated method was applied to analyzing surface water samples collected in Hanoi, Vietnam, indicating not only the presence of seven targeted parabens but also the prevalence of methylparaben in all water samples.
Electronic and optical properties of facial tris(8‐hydroxyquinoline) aluminum derivatives
Authors: Abdelfettah Bakadi , Abderrachid Helmaoui 
Published: March 2024

AbstractIn this study, we substitute facial Alq3 with (‐Mg) in positions 7 and 5 as electron donating group (EDG) and (‐Cl), (‐P) and (‐S) in position 7 as electron withdrawing groups (EWD). The ground and the first excited states geometries of facial Alq3 and their derivatives are optimized using B3lyp/6‐31G (d) methods. To analyse the electric transitions in these materials, the frontier molecular orbitals (FMOs) are calculated. It was found that the highest occupied molecular orbital (HOMO) is mainly situated on the phenoxide ring, while the lowest unoccupied molecular orbital (LUMO) is situated on the pyridyl ring, the atom C9 of phenoxide or in EWD atom. The dipole moment is calculated and analysed. The absorption and emission spectra are calculated with the TD‐DFT/6‐31G (d) method. It is seen that the electron donating or electron withdrawing groups in 7 positions caused a red‐shift in the absorption and emission spectra; what means that these substitutes have a significant effect on fac‐Alq3.
Chemical constituents of Clathria reinwardti
Authors: Trang Do Thi , Hang Dan Thi Thuy , Dung Duong Thi , Bang Ngo Anh , Huong Phan Thi Thanh , Yen Pham Hai , Tai Bui Huu , Cuc Nguyen Thi , An Do Hoai , Nhiem Nguyen Xuan , Thung Do Cong , Van Kiem Phan 
Published: March 2024

AbstractSeven compounds, dihydrosinularin (1), 11‐epi‐sinulariolide acetate (2), 10,18‐diacetoxydilabella‐2,7‐dien‐6‐one (3), 4‐(2′,3′,4′‐trimethylphenyl)‐but‐(3E)‐en‐2‐one (4), 4‐hydroxybenzaldehyde (5), indole‐3‐aldehyde (6), and methyl indole‐3‐carboxylate (7) were isolated from Clathria reinwardti. The isolates were identified by ESIMS, 1D and 2D NMR spectra. Compounds 1‐4 significantly exhibited the cytotoxic activity against SK‐LU‐1, MCF‐7, HepG2, and SK‐Mel‐2 cell lines with the IC50 values ranging from 3.8 ± 0.1 to 23.0 ± 0.2 μM, compared to the positive control compound (ellipticine, IC50, ranging from 1.4 ± 0.2 to 1.7 ± 0.1 μM). This is the first report of these compounds from C. reinwardti.
Controllable synthesis of uniform MgAl‐hydrotalcite nanoplates and their size‐dependent on anti‐corrosion properties of carbon steel
Authors: Vuong Phan Minh , Thoa Tran Thi Kim , Nhu Pham Quynh , No Nguyen Thi Hong , Ty Nguyen Minh , Huy Do Manh , Thao Phan Thanh , Hang To Thi Xuan 
Published: March 2024

AbstractHydrotalcite, a three dimensional anionic clay with a high anion exchange capacity, is a potential candidate for application in various fields, especially in anti‐corrosion. This study reports a facile synthesis to control the uniform particle size and well‐defined MgAl‐hydrotalcite hexagonal nanoplates in stable homogeneous suspension. The synthesized crystals were characterized by XRD, FTIR, TG‐DSC, ICP‐MS, and FE‐SEM. The results show that the crystals are well‐controlled particle size and morphology of individual sheets. The stability of products was confirmed using zeta potential measurement for three months at room temperature, and the lateral dimension was controlled between 50 and 300 nm. The influence of particle size on the corrosion inhibition effect of carbon steel was investigated by electrochemical measurement. The polarization curves and impedance diagrams indicated that the corrosion resistance effect of MgAl‐HT depends on both sides of the surface electric and the level deposition of crystallite on the electrode surface. The highest effective inhibition is 80.18 %, archiving on the diameter across 152.1 nm of hexagonal nanoplates.
A one‐stage sono‐coprecipitation synthesis of porous Fe3O4/bentonite nanocomposite as an adsorbent for methylene blue removal in water
Authors: Linh Ha Xuan , Trung Nguyen Thanh , Van Thanh Dang , Huy Nguyen Nhat , Dung Nguyen Quoc , Toan Tran Quoc , Mai Nguyen Thi , Thuy Nguyen Thi , Khai Nguyen Manh 
Published: March 2024

AbstractA porous Fe3O4/bentonite nanocomposite (FBC) was successfully synthesized via an efficient and green co‐precipitation reaction under ultrasonic assistance. The FBC material was characterized by XRD, BET, FTIR and SEM and employed for removing methylene blue from the aqueous solution. The results showed that this nanocomposite owned a reasonably high BET surface area of 98.36 m2/g and pore size of 9.32 nm. Adsorption isotherms were also studied for FBC material and methylene blue adsorption isotherm fitted well to Langmuir model with maximum adsorption capacity of 181.82 mg/g. The n value of Freundlich isotherm was 14.45 which indicated physical nature of the adsorption process. It demonstrated the great potential of the material in pollutants adsorption in water and wastewater treatment.
Hydrazineylidene‐3‐oxopropanal derivatives as antiviral agents for treatment of HBV and HCV: Experimental, DFT, and molecular docking studies
Authors: Benjamin Innocent , Louis Hitler , Udoikono Akaninyene D. , Agwamba Ernest C. , Unimuke Tomsmith O. , Ahuekwe Eze F. 
Published: March 2024

AbstractIn this study, two derivatives of hydrazineylidene‐3‐oxopropanal: chlorophenyl (CPHO) and Nitrophenyl (NPHO) substituted hydrazineylidene compounds were synthesized, spectroscopically characterized using (FT‐IR, UV, and NMR), and theoretically modelled as a potential drug for the treatment of antiviral hepatitis (HBV and HCV) using in‐sillico molecular docking approach. Electronic structure investigation based on density functional theory (DFT) at the B3LYP/6‐311++G(d,p) level of theory was conducted for the investigation of the structural, reactivities, and electronic properties of the studied compounds. The FT‐IR analysis in gas, water, ethanol and DMSO indicates a maximum stretching vibrations frequencies of C‐H in NPHO between 3249.38 to 3254.77 cm‐1 and 3236.04 to 3240.66 cm‐1 for CPHO, N‐H for NPHO is 3309.81 to 3336.37 cm‐1, and CPHO is 3330.11 to 3331.18 cm‐1, C=O in NPHO to be 1685.55 to 1705.60 cm‐1, and 1700.31 to 1679.15 cm‐1 for CPHO. The C‐N stretching vibrations in NPHO were 1519.98 to 1562.06 cm‐1 and 1430.05 to 1460.33 cm‐1 for CPHO. The UV‐Vis analysis indicates that NPHO wavelength absorption spectrum showed high excitation energy bands between 369.74 to 440.60 nm and CPHO at 178.95 to 434.08 nm. The highest stabilization energy of NPHO is LP (1) N12 donor and LP*(1) H10 acceptor with a value of 417.54 kcal/mol compared to πC17 ‐ O18 donor and π*C19 ‐ C28 acceptor with a value of 108.33 kcal/mol for CPHO. The molecular binding affinity of CPHO and NPHO had a high mean binding affinity of ‐5.83 and ‐6.05 kcal/mol, compared to the standard antiviral drugs with ‐5.00 kcal/mol. Therefore, the compounds show excellent reactivity based on the electronic structure, spectroscopic characterization and represent a potential antiviral agent treatment for HBV and HCV.
Plant extract mediated approach towards the synthesis of NiO nanoparticles: Evaluation of its antibacterial, antioxidant and photocatalytic activity
Authors: Ahmad Waseem , Bhatt Sumit Chandra , Kaur Nikky 
Published: March 2024

AbstractBio‐extract based nanoparticles have now become a global phenomenon. Their superior properties to the bulk material, and low cytotoxicity has made them essential component of nanotechnology. The current research was based on the phyto‐synthesised NiO nanoparticles by using Catharanthus roseus plant leaf extract. Sol gel method was used for this synthesis. The plant extract plays a significant role in the fabrication of nanoparticles. For characterization UV‐Vis spectroscopy, X‐ray diffraction analysis, FT IR analysis and scanning electron microscopy (SEM) were used. They were also examined for their antibacterial properties by using agar diffusion method (ADM) against different bacteria (gram negative strain of E. coli, Pseudomonas spp. and gram positive strain of Bacillus spp.). Photocatalytic degradation proficiency was studied for bromothymol blue dye. Phytochemicals‐coated Nickel Oxide nanoparticles demonstrated antibacterial properties against bacteria (gram negative strain of E. coli, Pseudomonas spp. and gram positive strain of Bacillus spp.) by showing highest zone of inhibition (19 mm, 22 mm, 15 mm).the antioxidant activity of the synthesized nanoparticles were also examined and the result show that the fabricated nanoparticles exhibited significant radical scavenging activity. Degradation proficiency of nanoparticles for bromothymol blue dye was found to be 2.76% in sunlight (for 90 min), and 1.76% in UV light (for 90 min).
Fabrication and characterization of PMMA/ZrO2 nanocomposite 3D printing filaments
Authors: Linh Nguyen Thi Dieu , Huy Khuc Duong , Dung Nguyen Thi Kim , Luong Ngo Xuan , Hoang Thai , Tham Do Quang 
Published: March 2024

AbstractThe 3D printing PMMA/ZrO2 filaments with a diameter of 1.75 ± 0.05 mm were fabricated by using a single‐screw extruder at temperatures of four heating zones of 190, 200, 210, and 210°C. Testing samples were prepared from the extruded filaments by using a fusion deposition modeling 3D printer and a Haake MiniJet piston injection molding machine. Fourier transform infrared spectroscopy, mechanical properties, field emission scanning electron microscopy (FESEM), differential scanning calorimetry, and thermogravimetric analysis of the filaments were investigated. It was suggested the formation of physical and molecular interactions between surface hydroxyl groups of ZrO2 nanoparticles and C‐O‐C groups of PMMA in the PMMA/ZrO2 filaments. FESEM images of the filaments indicated the good dispersion of ZrO2 nanoparticles in the PMMA matrix, nevertheless, there was still the formation of clusters of ZrO2 nanoparticles in the nanocomposite filaments. The incorporation of nano ZrO2 increased the thermal properties, bending, and tensile moduli of PMMA. The mechanical properties of the 3D‐printed samples were lower than those of the molded samples. However, the bending strength of the 3D‐printed samples was much higher than 50 MPa, bending modulus was much higher than 1800 MPa, as required for acrylic bone cement (in ISO 5833:2002).
In situ synthesis and characterization of nano‐hydroxyapatite/starch composites
Authors: Huong Nguyen Thi Lan , Tuan Phan Dinh , Bich Phan Thi Ngoc , Thao Nguyen Minh , Tung Mai Thanh 
Published: March 2024

AbstractNano‐hydroxyapatite/starch composite was synthesized using in situ precipitation. Starch concentration effect on the structure of composite was examined. Characterization of the obtained samples, The X‐ray diffraction and Fourier transform infrared spectroscopy demonstrated the purity of the formed nano‐HA in the starch matrix. Morphology studies of the samples, checked by field emission scanning electron microscope and transmission electron microscope, show the effects of starch on the size, shape, and morphology of hydroxyapatite nanoparticles.
Coatings made from chemicals: A review
Authors: Chowdhury Suman , Nepal Sadiksha , Bhattarai Ajaya , Saha Bidyut 
Published: March 2024

AbstractIn the ongoing process of civilization, surface modification has become almost an indispensable route to enjoy the optimum benefit from any material in the materialistic world. Especially, active metals require the modification maximum to escape the natural corrosion or passivation. The retention of sound performance of the metals as well as extension of their lifetime can be achieved by surface modification of coating formation. Chemical coating is one of the simple and low‐cost methods of coating with great versatility including pre‐treatment and post‐treatment. This paper includes the most widely used inorganic and organic chemical coating methods and their fewer details and their future outlooks.
Preparation and characterization of achira starch oxidized by different concentration of sodium hypochlorite
Authors: Van Khoi Nguyen , Tung Nguyen Thanh , Ha Pham Thi Thu , Trang Pham Thu , Duc Nguyen Trung , Huong Nguyen Thu , Phuong Nguyen Thi Lien 
Published: March 2024

AbstractIn this study, achira (Canna edulis) starch was oxidized by sodium hypochlorite and the effects of different concentration of oxidation agent (1, 2, 3 and 5%) on the physicochemical properties, morphological properties and crystallinity of achira starch (AS) was investigated. The carbonyl and carboxyl content, starch colour parameters, swelling capacity, solubility, IR spectra, SEM and XRD of native and oxidized achira starch (OAS) were evaluated. IR spectra of oxidized starch samples showed a new absorption peak which was assigned to the characteristic peak of carbonyl C=O, proved that starch had been oxidized. At lower concentration of sodium hypochlorite, there was no clearly change on the morphology of OAS granules, however, at higher concentration of oxidant (5%), there were some indentations and cracks on the surface of OAS‐5 starch granules. Oxidation with sodium hypochlorite has no significant effect on the crystallinity of the starch. Both AS and OAS granules showed the typical B‐type X‐ray diffractogram, indicating that the oxidation occurred in the amorphous region. After treating with oxidized agent, content of carboxyl groups increased significantly, whereas content of carbonyl groups slightly increased. The total oxidation degree of OAS samples increased with the increase of the concentration of hypochlorite treatment. Oxidation with sodium hypochlorite clearly increased both the swelling capacity and solubility of achira starch. Whiteness of starch was also improved.
Simple synthesis of mesoporous ferrite materials as magnetic adsorbents for phosphate removal
Authors: Ngo Duc Toan , Hoang Thanh Danh Nguyen , Pham Nguyen Anh Thu , Dang Tien Thi Thuy , Nguyen Quoc Thiet , Le Tien Khoa 
Published: March 2024

AbstractMesoporous MFe2O4 materials (M = Mn, Cu, and Co) as magnetic adsorbents for phosphate removal were synthesized by a simple coprecipitation method without annealing at high temperatures. Several techniques, including powder X‐ray diffraction, field emission electron scanning microscopy, nitrogen adsorption‐desorption and vibrating sample magnetometry were used to characterize the samples. The effects of M2+ ions on their point of zero charge and their phosphate adsorption capacity were investigated. All three samples consist of nanosized particles with cubic spinel structure and ferromagnetic properties, which allows them to be easily separated from aqueous effluents using a magnet. According to the batch experiments, the adsorption isotherms and the adsorption kinetics for these mesoporous materials are well fitted with the nonlinear Langmuir model and the nonlinear pseudo‐second‐order model, respectively. Among them, CuFe2O4 powder showed the best phosphate adsorption performance with the maximum P adsorption capacity of 27.49 mgP g‐1, which can be assigned to the highest surface area and the high pH value at its point of zero charge.