查看更多>>摘要：In this study, we aimed to synthesize a new photoluminescent nanocomposite based on hyperbranched polymers derived from arginine through an easy method for drug delivery application. Hence, a new hyperbranched polymer (HBPAC) via co-polymerization of citric acid (as A3 type monomer) and Larginine (as AB2 type monomer) was synthesized and composited with glucose-derived quantum dot (GluQD) to obtain the HBPAC-GluQD nanocarrier. The HBPAC-GluQD was characterized, and its potential was studied as a nanocarrier. The particles size of the nanocomposite was about 90-200 nm. The antioxidant study of the HBPAC-GluQD revealed its excellent antioxidant properties. Also, the prepared HBPACGluQD showed photoluminescence (PL) in the blue range under 322 nm excitation with a QY of 72.8%. In vitro bioimaging investigations determined that HBPAC-GluQD has a potential for bioimaging applications. In-vitro release investigation of the HBPAC-GluQD nanocarrier exhibited that the composite has pH-responsive behavior and showed that the highest release happens at pH 5. Also, the stability, red blood cells compatibility, and MTT assay were evaluated. The obtained results showed that the HBPAC-GluQD as a nanocarrier is stable enough, biodegradable, and hemocompatible in physiological condition. Also, apoptosis, cellular uptake, and MTT analysis showed that the HBPAC-GluQD-DOX/MTX could efficiently induce cellular apoptosis. (c) 2022 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
查看更多>>摘要：Nanofiltration membranes with excellent anti-fouling properties were fabricated through a green surface crosslink method. Poly (styrene-maleic anhydride) (SMA) blended polyethersulfone (PES) membrane was used as a support. The SMA in the PES support served as a macromolecular crosslinker. After coating of polyvinyl alcohol (PVA) on the surface of the SMA-PES support, a PVA selective layer with gradient cross-linked structure was formed, through the esterification between the anhydride groups in SMA and the hydroxyl groups in PVA. This process adopts a full-water fabrication strategy without secondary pollution. The gradiently cross-linked PVA/SMA-PES membrane, with molecular weight cut-off (MWCO) about 600 Da and permeance around 10-12 L/(m(2).h.bar), exhibited good dye/salts separation performance. In the filtration of a mixed solution of Congo Red (CR) and calcium chloride (CaCl2), the membrane rejected 98% CR and only had 10% rejection of CaCl2. In addition, this membrane processed an excellent anti-fouling property. In the BSA fouling test, the pure water flux recovery ratio (FRR) was 99%. It is expected that the PVA/SMA-PES membrane can be used in organic desalination. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Cantharidin (CTD), an effective component of Chinese herbal medicine with unique efficacy, caused poisoning or death constantly for incorrect use. Therefore, there is an intense need for a reliable, selective, sensitive and low-costing analytical method for monitoring the concentration of CTD in biological samples. In this work, a ratiometric fluorescent sensor (CdTe@MIPs/CDs@NIPs) was successfully constructed for selective determination of CTD by simply integrated the non-imprinted polymers coated CDs (CDs@NIPs) with cadmium telluride quantum dots coated with molecular imprinted polymers (CdTe@MIPs). CDs@NIPs were directly used as reference signal without addition of CTD templates and the as-prepared CdTe@MIPs were response signal. With the CTD addition, the fluorescence intensity of CdTe@MIPs decreased, while the fluorescence of CDs@NIPs remained approximately unchanged, resulting a detection limit as low as 0.15 nM. By spiked human blood samples, the ratiometric sensor was successfully applied to CTD detection with good recoveries of 96.12-107.40% and relative standard deviation (RSD) of 2.87-3.96%. Moreover, after centrifuging and re-eluting, the developed sensor could be effectively recycled and reused five times. Significantly, the proposed platform with low-cost and highsensitivity opens a door towards the practical applications of ratiometric sensor and shows immense potential in pursuing the sensitive, reliable and low-cost determination of poisons in forensic toxicology analysis. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：As load-bearing material in biomedical-applications as cartilage replacement, artificial meniscus and ten -dons, etc., poly(vinyl alcohol) (PVA)/graphene oxide (GO)-tannic acid (TA) nano-composite hydrogels with multiple-crosslinking network were fabricated by establishing freezing/thawing-annealing-swelling method. By TA anchoring, PVA molecules were grafted onto GO surface efficiently, and strong interfacial interaction led to exfoliation and uniform distribution of GO in matrix. By introducing annealing process, the crystallinity and crystallite size of PVA increased and introducing GO-TA led to more perfect and den -ser crystalline structure, while physical crosslinking network centered on GO-TA and hydrogen bond -abundant crystalline phase formed, resulting in increasing crosslinking density of hydrogel. By further swelling in CaCl2 aqueous solution, hydroxyl-Ca(2+)coordination formed, and multiple-crosslinking net-work was constructed with high crosslinking density. The tensile strength and fracture toughness of com-posite hydrogel were remarkably improved, reaching 14.38 MPa/27.93 MJ/m(3), approximately 11-/26-fold higher than those of neat PVA hydrogel, while tearing strength was significantly enhanced, attributed to high energy dissipation through unzipping multiple interactions. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Developing multifunctional, efficient and durable membrane for treating complex oily wastewater is highly desirable but still a challenge due to the severe membrane fouling. Herein, nanosponge membrane with 3D-macrocycle beta-cyclodextrin (beta-CDs) as molecular cage was manufactured by azide-alkyne click reaction for oil/water treatment and antifouling properties simultaneously. The macrocyclic 'molecular cage' geometry of beta-CDs can induce various guest molecules into their cavities. When clickable beta-CD N-3 was fixed onto a clickable EVAL-equivalent to membrane surface, the hydrophilicity of the membrane was greatly improved. Furthermore, the molecular cage-grafted membrane (EVAL-g-CD) showed better antifouling performance than a pure EVAL membrane, with lower water flux decline (15%) and higher water flux recovery (91%). The flux and separation efficiency values of the EVAL-g-CD membrane were higher than 120 L.m(-2).h(-1) and 99%, respectively. The EVAL-g-CD membrane also exhibited good adsorption performance for organic pollutants owing to its cavity structure. Furthermore, the membrane showed desirable stability and its rejection remained at 99% after filtration. This proposed 3D membrane strategy based on molecular cages sheds light on the formation of hydrophilic membrane surfaces and shows great promise for potential applications such as the separation of oil-in-water emulsions. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Vanadium pentoxide (V2O5) brings vast interest in the promising host materials for the intercalation of multivalent ions, owing to its abundance in the earth crust, synthesizing facile methodologies, and offers maximum discharge capacity of >300 mAh g1. However, V2O5 undergoes different phase transformations upon the intake of beyond 1 mol Li. Here, we report a comparative study of two versatile cathode materials, such as V2O5 (limiting 1 mol. Li) and LiFePO4. A solvothermal method is adopted to synthesize both two, and three-dimensional crystalline phases of V2O5 and LiFePO4, respectively. The sphericalshaped V2O5 exhibits the initial discharge capacity of 136 mAh g-1 in the half-cell assembly and renders stable cycle life. Subsequently, V2O5 is paired with the electrochemically lithiated graphite (LiC6) anode in full-cell assembly (V2O5/LiC6) and offers a maximum energy density of 266.7 Wh kg-1 (based on total mass loading). On the other hand, LiFePO4 also exhibits -136 mAh g-1 in the half-cell performance with stable cycle life. The full-cell LiFePO4/C delivers an energy density of 234.8 Wh kg-1. This clearly encourages that V2O5 is a strong contender for the 3.4 V class Li-ion cells and paves the new avenue for further exploration of advanced battery technologies. CO 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Al-Masoud, May AhmedKhalaf, Mai M.Mohamed, Ibrahim M. A.Shalabi, K....
25页
查看更多>>摘要：Two novel nanocomposites based on polyaniline functionalized ZnO and ZnO-SiO2 nanoparticles (ZnO@PANi and ZnSiO@PANi) were synthesized, characterized, and evaluated as protective films for steel pipelines in the pickling process at 25-55 degrees C. The prepared nanocomposites were described using different spectroscopic characterization methods including UV-vis, FTIR, DLS, XPS methods, and other physicochemical techniques including XRD, FESEM, and HR-TEM. The novelty of these films is in the fact that the ZnO and ZnO-SiO2 nanoparticles are functionalized by polyaniline which is electrochemically stable in acidic solution and has high conductivity. Electrochemical systems such as open circuit potentials (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP) were utilized to attain the kinetics and mechanistic findings of the corrosion protection route. The outcomes indicate that the two fabricated ZnO@PANi and ZnSiO@PANi are efficient acidic corrosion inhibitors. The protection performance of ZnSiO@PANi (98.6%) was more pronounced at a dose (150 mg/L) than ZnO@PANi (92.3%) and individual PANi (83.4%) as achieved from PDP findings. The effect of temperature and flowing conditions reinforces further the performance of both nanocomposites. Surface characterization using FESEM/EDS delivered more indication for the steel surface protection with the ZnO@PANi and ZnSiO@PANi nanocomposites. Molecular modeling using DFT calculations and MC simulations supported the experimental findings. The binding energies of the compounds and Fe interface follow the order of ZnO@PANi > ZnSiO@PANi, which is in good agreement with the empirical results. An important suggestion of these results is the probability of substituting traditional toxic small molecules with cost-effective and non-toxic polymeric nanocomposites as protective films for use in the oil and gas industry. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Hydrogen sulfide (H2S) is the richest and stinkiest toxic gas found around coal mines, manholes, and semiconductor industries. However, there are not many studies on H2S detection around various industrial sites using wireless sensors. This study proposes an H2S wireless sensor system that communicates of the reader antenna and the sensor tag using 904 MHz activated radio frequency identification (RFID). The sensor tag is formed through an iron oxide-immobilized multiscale pore contained carbon nanofiber (Fe2O3-MPCNF)-based conductive paste. This wireless sensor tag has a large detection range (0.2 to 100 ppm) at 25 degrees C, is very sensitive to H2S gas (0.2 ppm or less), and is inexpensive to process. In addition, the sensor tag has a long operating range (5-40 cm) and excellent flexibility, and has excellent cycle stability (up to 35 days), making it practical for wearable devices for wireless detection. CO 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Kim, Kwang-SeokLee, Hye-MinKim, Ju-HwanJung, Injun...
10页
查看更多>>摘要：Despite active research on supercapacitors to address the demand for high-power backup power systems, the energy storage performance of supercapacitors at high current densities has scope for improvement owing to the poor kinetics of active materials. In this study, multiscale porous carbon-based active materials were designed to improve the kinetics and power density of supercapacitors. These materials were fabricated by spinodal decomposition of a mixture comprising an epoxy resin, a curing agent, and a porogen, to which graphene was added to optimize the carbonaceous microstructure. The resultant material exhibited a wider pore-size distribution and considerably improved microstructure than commercial activated carbon (YP-50F). The charge-transfer resistance of the sample containing 3 wt.% graphene (A-EM3) was considerably lower than that of YP-50F owing to the microstructural improvement. Furthermore, the effective ionic conductivity of A-EM3 was approximately three times higher than that of YP-50F owing to enhanced mass transfer. A-EM3 exhibited a high specific capacitance (81.0 F g(-1)) at the highest current density (10.0 A g(-1)). Thus, spinodal decomposition and graphene addition are effective means to fabricate high-power-density supercapacitors. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：To reduce the wastes discharging and production cost for preparation of cobalt blue pigments via common liquid-phase methods, the low-cost and high-chroma cobalt blue composite pigments are fabricated via CaCO3-assisted mechanochemical route followed by an annealing process based on the discarded kaolin tailing sand (KTS) from the mineral processing. The preparation conditions, formation and coloring mechanisms of composite pigments are studied systematically. The optimal color performance (L* = 40.54, a* = 4.12, b* = -55.22) is obtained after optimizing the preparation conditions. The results indicate that CaCO3 acts as a mild precipitant with the assistance of mechanochemical effects to form the precursor. Furthermore, incorporation of KTS improves the color lightness and blueness of cobalt blue pigments due to the reflection of KTS toward light and well dispersion of CoAl2O4 on KTS surface. Compared with the commercial cobalt blue pigments, the oil absorption and hiding power of composite pigments are high while the relative tinting strength slightly reduces owing to the differences in their size and CoAl2O4 content, but the composite pigments may be more popular due to the low production cost and excellent color performance. Moreover, the as-prepared composite pigments present excellent acid-resistance and coloring performance as a ceramic pigment.(c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rightsreserved.
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