JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2022
·
IF 5.062
Xiuqiong Chen,Qingmei Zhu,Yanshi Wen,Zhengyue Li,Shanshan Cao,Huiqiong Yan,Qiang Lin
To examine if the improvement of the molecular flexibility for the reductive-amination of oxidized alginate derivative (RAOA) through chemical modification could be conducive to the enhancement of alginate electrospinnability, we attempted to use the electrospinning technology to develop the alginate derivative electrospun composite nanofibers that can load the hydrophobic anti-inflammatory drug, ibuprofen , with the aid of polyvinyl alcohol (PVA). The synthesized RAOA was examined by FT-IR spectrometer, 1 H NMR spectrometer and fluorescence spectrophotometer. Furthermore, the effects of surface tension, electrical conductivity and rheological properties of the RAOA/PVA blend solution on the electrospinning property and fiber morphology of the resultant RAOA/PVA electrospun composite nanofibers were explored by surface tension meter, conductivity meter, rheometer and SEM. Subsequently, the drug loading and release mechanism of ibuprofen from the RAOA/PVA electrospun composite nanofibers were analyzed through the simulated drug release test. In addition, the cytotoxicity of the RAOA/PVA electrospun composite nanofibers was also evaluated with L929 cells by Cell Counting Kit-8 (CCK-8) assay. Experimental results showed that the hydrophobic side groups were successfully grafted onto the alginate backbone by the oxidation-reductive amination reaction, which destroyed the intramolecular hydrogen bond of the raw sodium alginate (SA), thus enhancing the molecular flexibility and colloidal interface activity of RAOA. So the RAOA could exhibit good amphiphilic property with the critical aggregation concentration (CAC) of 0.42 g/L in NaCl solution, and form the self-assembled micelle with the average hydrodynamic diameter of 615 nm (PDI = 0.24) and zeta potential at about −66.5 mV. Although the oxidation-reductive amination reaction for the modification of RAOA could not fundamentally achieve the generation of bead-free nanofibers by electrospinning of single RAOA aqueous solution, it could improve the electrospinning performance of RAOA/PVA blend solution and increase its content in the RAOA/PVA electrospun composite nanofibers. Furthermore, the fabricated RAOA/PVA electrospun composite nanofibers exhibited the high encapsulation efficiency (EE) and sustained-release property in comparison with the 50/50 SA/PVA electrospun composite nanofibers, due to the good affinity of RAOA to hydrophobic ibuprofen that achieve the loading and controlled release of the hydrophobic drug. Besides, the RAOA/PVA electrospun composite nanofibers exhibited low cytotoxicity to L929 cells. Therefore, the resultant RAOA/PVA electrospun composite nanofibers, combining the structural characteristics of the electrospun nanofibers and the properties of RAOA including the good self-assembly performance, colloidal interface activity, sustained release performance and good cytocompatibility, may possess great potentials as the functional wound dressings for biomedical applications.
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Photonics Research
·
2022
·Vol. 10
·期 3
·628-636
·
IF 7.254
Qian Xiong,Qian Xiong,Qian Xiong,Qian Xiong,Sihao Huang,Zijun Zhan,Juan Du,Juan Du,Juan Du,Juan Du,Xiaosheng Tang,Xiaosheng Tang,Zhiping Hu,Zhengzheng Liu,Zeyu Zhang,Weiwei Chen,Yuxin Leng,Yuxin Leng,Yuxin Leng,Yuxin Leng
In recent years, all-inorganic halide perovskite quantum dots (QDs) have drawn attention as promising candidates for photodetectors, light-emitting diodes, and lasing applications. However, the sensitivity and instability of perovskite to moisture and heat seriously restrict their practical application to optoelectronic devices. Recently, a facile ligand-engineering strategy to suppress aggregation by replacing traditional long ligands oleylamine (OAm) during the hot injection process has been reported. Here, we further explore its thermal stability and the evolution of photoluminescence quantum yield (PLQY) under ambient environment. The modified CsPbBr3 QDs film can maintain 33% of initial PL intensity, but only 17% is retained in the case of unmodified QDs after 10 h continuous heating. Further, the obtained QDs with higher initial PLQY (91.8%) can maintain PLQY to 39.9% after being continuously exposed in air for 100 days, while the PLQY of original QDs is reduced to 5.5%. Furthermore, after adhering CsPbBr3 QDs on the surface of a micro SiO2 sphere, we successfully achieve the highly-efficient upconversion random laser. In comparison with the unmodified CsPbBr3 QDs, the laser from the modified CsPbBr3 QDs presents a decreased threshold of 79.81 μJ/cm2 and higher quality factor (Q) of 1312. This work may not only provide a facile strategy to synthesize CsPbBr3 QDs with excellent photochemical properties but also a bright prospect for high-performance random lasers.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Haolin Li,Fan Xu,Kun Cui,Bingyu Tian,Rui Dong,Mingjin Fan
Lubricating materials for highly reactive titanium alloys are not sufficiently abundant, limiting their wide practical applications. In this work, the tribological properties for various lubricants on titanium alloy surfaces are investigated, as well as their physicochemical and adsorption properties in terms of structural composition. The results indicated that high polarity, long alkyl chain length and small spatial site resistance will be positively correlated with the tribological properties. The FIB-TEM analysis further illustrates that the film-forming mechanism of strong polar adsorption and tribo-chemical reaction is vital to high-performance lubricants on titanium alloys. This work shows great instructive significance to investigate the tribological properties and interaction mechanisms on titanium alloy surfaces from the perspective of molecular design.
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CHINESE JOURNAL OF CHEMISTRY
·
2023
·Vol. 41
·期 18
·2305-2310
·
IF 5.4
Rongye Li,Yue Zhao,Min Lin,Jing Sun
Comprehensive Summary Great efforts have been lately devoted to fabricating well-defined nanostructures using crystallization-driven self-assembly (CDSA) strategy. The influence of self-assembly on crystallization is also of great interest. Here, a series of amphiphilic diblock copolypeptoids poly( N -allylglycine)- b -poly( N -octylglycine) modified with cysteamine hydrochloride ((PNAG- g -NH 2 )- b -PNOG) were synthesized by ring-opening polymerization (ROP) and post-polymerization functionalization. The diblock copolypeptoid is comprised of one hydrophobic crystalline PNOG block and one hydrophilic amorphous block, which can aggregate into nanostructured assemblies with soluble PNAG- g -NH 2 as the corona layer and PNOG as the inner core in aqueous solution. With a systematic study by differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS), we demonstrated that the self-assembly of the block copolymers strengthens the crystallization of the PNOG block.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhaojun Wang,Shuntian Huang,Xinyu Zhao,Shujuan Yang,Keyang Mai,Wenqi Qin,Kaiyue Liu,Junhao Huang,Yuhong Feng,Jiacheng Li,Gaobo Yu
Significant challenges remain in designing sufficient viscoelasticity polysaccharide-based high internal phase Pickering emulsions (HIPPEs) as soft materials for 3D printing. Herein, taking advantage of the interfacial covalent bond interaction between modified alginate (Ugi-OA) dissolved in the aqueous phase and aminated silica nanoparticles (ASNs) dispersed in oil, HIPPEs with printability were obtained. Using multitechniques coupling a conventional rheometer with a quartz crystal microbalance with dissipation monitoring, the correlation between interfacial recognition coassembly on the molecular scale and the stability of whole bulk HIPPEs on the macroscopic scale can be clarified. The results showed that Ugi-OA/ASNs assemblies (NPSs) were strongly retargeted into the oil–water interface due to the specific Schiff base-binding between ASNs and Ugi-OA, further forming thicker and more rigid interfacial films on the microscopic scale compared with that of the Ugi-OA/SNs (bared silica nanoparticles) system. Meanwhile, flexible polysaccharides also formed a 3D network that suppressed the motion of the droplets and particles in the continuous phase, endowing the emulsion with appropriately viscoelasticity to manufacture a sophisticated “snowflake” architecture. In addition, this study opens a novel pathway for the construction of structured all-liquid systems by introducing an interfacial covalent recognition-mediated coassembly strategy, showing promising applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yun Tang,Xiaoqiang He,Yuchao Zhang,Hudie Yuan,Yalou Xin,Xiaohu Ren,Qiang Chen,Hongfeng Yin
Widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is being challenged for their poor color rendering index (CRI) and high correlated color temperature (CCT) due to the lack of red emission. Organic-inorganic hybrid perovskite nanocrystals (MAPbX 3 PNCs, X = Cl, Br, I or mixture of them), presenting high photoluminescence quantum yield, tunable emission color and simple fabrication process have been recognized as promising red-emitting component for warm WLEDs. However, additional protection process for PNCs always needed due to their poor stability, which complicates the fabrication procedures of WLEDs. Besides, nano-sized PNCs and micron YAG:Ce powder display different sinking behavior in silicone , which also hard to ensure the uniform distribution of the two components and subsequently stable optical characteristics of the device. Herein, a one-pot anchoring strategy is implemented to realize the enhanced thermal and photo-stabilities of in-situ generated red-emitting MAPbBr 0.5 I 2.5 PNCs and simultaneously strong interaction between the PNCs and YAG:Ce to form PNCs@A-YAG composite, which greatly simplifies the processes, and also avoids the uneven distribution of phosphor and PNCs in silicone . Furthermore, the WLED, fabricated by PNCs@A-YAG and a commercial blue chip, exhibits high CRI of 92, low CCT of 4755 K, and super high saturated red color R9 of 95, which are of vital importance in achieving warm white light for indoor lighting applications. This work could promote the practical application of perovskite nanocrystals in the field of high color rendering index WLEDs.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chenrui Liu,Yun Liu,Wentao Shen,Shuangyi Lin,Hao He,Fan Li,Feng Li,Jiang Tian
The environmental migration and bioavailability of Hexavalent chromium (Cr(VI)) could be affected by facet-dependent pyrite (FeS 2 ) existing in soils and sediments. Conversely, the occurrence state of facet-dependent FeS 2 might also be influenced by Cr(VI). However, the complex interactive mechanism at the solid–liquid interface between facet-dependent FeS 2 and Cr(VI) still remained ambiguous. Herein, FeS 2 nanobelts, FeS 2 nanosheets, and FeS 2 nanocubes with corresponding dominant facets of ( −1 1 0), (0 0 1), (1 0 0)/(2 1 0) were prepared. The adsorption and reduction experimental results reflected that Cr(VI) species were predominantly adsorbed and a portion of them was reduced to Cr(III) at the FeS 2 interfaces. In particular, the adsorption efficiency of Cr(VI) on (0 0 1) facet was 1.39 and 4.69 times than those on ( −1 1 0) and (1 0 0)+(2 1 0) facets, respectively. The results of in situ Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) measurements and Density Functional Theory (DFT) calculations suggested that bidentate binuclear (BB) coordinated chromates were generated on the (0 0 1) facet while monodentate mononuclear (MM) coordinated chromates were formed on ( −1 1 0), (1 0 0), and (2 1 0) facets. Due to the stronger adsorption energy and more stable coordination mode of BB for Cr(VI) species on (0 0 1) facet, FeS 2 NS exhibited higher efficiency of Cr(VI) removal and reduction compared with FeS 2 NB and FeS 2 NC. In addition, partial FeS 2 particles were proved to be transformed to goethite under the effect of Cr(VI). Owing to the stronger adsorption of Cr(VI) species on (0 0 1) facet, FeS 2 NS also had a faster phase transformation rate than FeS 2 NB and FeS 2 NC. Above results all reflected the good structure–reactivity relationships between the FeS 2 facets and the Cr(VI) removal efficiency as well as the phase transformation of FeS 2 particles.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiangfei Geng,Yang Yang,Zhiming Wu,Cong Zhang,Bin Ding,Weidong Liu,Qun Zhang,Baoshan Guan
Alkane-modified molybdenum disulfide (AM-MoS 2 ) nanosheets have attracted widespread interest as oil displacement agents for enhancing oil recovery due to their unique oil-water interfacial properties . However, the relationship between the interfacial activity and alkyl chain structure of AM-MoS 2 is not comprehensively understood. In this study, 3AM-MoS 2 nanosheets were prepared with MoS 2 and alkylamines to study the effect of alkyl chain length on the oil-water interfacial activity of AM-MoS 2 nanosheets under different salinity conditions. The AM-MoS 2 nanosheets prepared with octylamine, dodecylamine, and octadecylamine were referred to as AM 8 -MoS 2 , AM 12 -MoS 2 , and AM 18 -MoS 2 , respectively. AM 18 -MoS 2 , which possesses the longest alkyl chain among all the samples, exhibited the highest oil-water interface adsorption ratio within the experimental concentration and salinity ranges. However, the changes in oil-water interfacial tension (IFT) did not agree with the changes in the interface adsorption ratio of nanosheets. AM 18 -MoS 2 exhibited the best interfacial activity, and the IFT was lower than that of MoS 2 , AM 8 -MoS 2 and AM 12 -MoS 2 when the salinity was no more than 5000 mg/L, while AM 12 -MoS 2 and AM 8 -MoS 2 exhibited the best interfacial activity and the lowest IFT when the salinity reached 10,000 mg/L and 20,000 mg/L, respectively. Considering that the interface adsorption ratio of AM 18 -MoS 2 was higher than that of the other samples under all the experimental conditions, the change in IFT and interfacial activity could be attributed to the change in the morphology of the adsorption layer of nanosheets. The decreased charge repulsion and the increased hydrodynamic size of nanosheets, which resulted from increased salinity, had positive and negative effects, respectively, on the morphology of the adsorption layer. The competition between the two effects resulted in the inflection point in the relationship between the IFT and salinity of AM-MoS 2 . The AM-MoS 2 nanosheets with the optimum alkyl chain length balanced the dispersity and hydrophobicity , which contributed to achieving the best interfacial activity at a certain salinity.
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2023
·
IF 3.9
Yulan Qian,Ye Yuan,Junyang Zhu,Jinglong Li,Chengqi Jiao,Xiaoqing Xiong
In this study, three N ,4-dialkyl-substituted 1,8-naphthalimide fluorescent dyes (NPBA, NPHA, and NPOA) were synthesized in supercritical carbon dioxide (scCO 2 ) by reacting 4-bromo-1,8-naphthalic anhydride with three amines ( n -butylamine, n -hexylamine, and n -octylamine). The optimal reaction conditions and highest yields of these dyes were obtained. The yield of NPHA was 92% ± 0.57% using an organic solvent-free synthetic method. The results also indicate that the reaction time was gradually shortened by elongating the alkyl chain in the amines, and the required reaction pressure was 12 MPa or lower. Additionally, the dyeing of polyester fabrics with these three dyes was investigated using scCO 2 . The optimal dyeing time and temperature for NPBA were 70 min and 150 ℃, but they decreased at 10 gradients with the addition of two carbon atoms to the alkyl chain in the amines. The optimal dyeing pressure increased from 20 MPa to 24 MPa.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 30
·1-10
·
IF 2.8
Ren Ying,Zhou Heng,Huang Wentao,Li Hongyu,Li Zhengxin
Rapid industrialization has brought about Cr 6+ pollution, and the excellent performance of carbon dots (CDs) provides a new idea for preparing environmentally friendly nanoprobes for Cr 6+ detection. In the present work, five spherical fluorescent CDs with an average diameter of 4 nm based on citric acid, citric acid and p-phenylenediamine, citric acid and octylamine, gelatin, and glutamic acid were synthesized by a one-step hydrothermal process. Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–Vis) absorption spectra and steady-state fluorescence spectroscopy were used to detect the fluorescence properties of CDs. A fluorescent “on–off” sensor was used to investigate the effects on Cr 6+ by using the fluorescence burst mechanism of CDs. The results indicate that Cr 6+ had a fluorescence burst effect assigned to CDs its chelation with the Cr(VI) on all the four CDs containing elemental nitrogen which facilitating charge transfer from the excited state of the CDs to Cr(VI). Among the other four CDs used for Cr(VI) detection, the gelatin-based CDs had a wide detection range and good linearity ( R 2 = 0.9873) for Cr(VI). There is a linear relationship between the degree of fluorescence burst and the Cr 6+ concentration, which provides a reference for the use of CDs in metal ion detection.
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Materials Today Chemistry
·
2023
·
IF 7.3
Haijiang Qiu,Jianing Wu,Min Li,Zhenyu Hu,Song Yang,Yanyan Li,Yingying Gu,Hongrui Cheng,Yuanhui Zheng
Gallium nitride quantum dots (GaN QDs), as a third-generation semiconductor material, are usually synthesized through a vapor deposition method at an elevated temperature (typically ≥800 °C). Thermal injection method is rarely reported for the synthesis of GaN QDs due to the lack of active precursors and the require of harsh reaction conditions. Here, we report the fabrication of oxygen doped colloidal GaN QDs via rapid thermal injection. By screening the reaction temperature and solvent, well-dispersed GaN QDs with a size of 3.8 nm were obtained in octadecylamine (ODA) at 360 °C. The synthesized GaN QDs show blue emission, the maximum emission wavelength is about 440 nm, and the photoluminescence quantum yield is 14.3%. Furthermore, we reveal the donor-acceptor mechanism of blue emission from GaN QDs. During the growth of GaN QDs, oxygen atoms occupy some nitrogen sites and produce a shallow oxygen donor energy level (O N ). A part of the O N can be combined with the adjacent gallium vacancy (V Ga ) to form a V Ga -O N acceptor, whose energy level is about 0.98 eV above the valence band of GaN QDs. The transition of excited electrons from the donor (O N ) to the acceptor (V Ga -O N ) is responsible for the blue emission of GaN QDs.
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Hao Yang,Min Zhang,Lei Wang,Renzhong Yu,Wenwen Tu,Zhaoyin Wang,Rui Wang,Huan Gao,Zhihui Dai
Polarization of photoactive materials in current photoelectric (PE) systems is difficult to be adjusted, and thus electron-transfer routes of these systems are unchangeable, which limits their performance in photoelectrochemical (PEC) analysis. Herein, we attempted to modulate the polarization of perovskite-based heterostructures by both in situ semiconductor generation and enzyme catalysis. Owing to their band alignments, Cs3Bi2Br9 quantum dots (QDs) and BiOBr are confirmed to construct a Z-scheme structure, leading to a large anodic photocurrent. In the presence of ascorbic acid 2-phosphate (AAP), BiPO4 is generated on the surface of the Cs3Bi2Br9 QDs/BiOBr heterostructure, reassigning energy bands of BiOBr. Accordingly, polarization of the photoactive materials is converted, and a new Z-scheme structure with a reversed electron-transfer route is constructed, which leads to an evident cathodic photocurrent. Furthermore, abundant electron donors can be obtained by catalyzing AAP with alkaline phosphatase (ALP). In this case, photogenerated holes in BiOBr are preferentially annihilated by electron donors, thereby blocking transfer of photogenerated electrons in the Cs3Bi2Br9 QDs/BiOBr/BiPO4 heterostructure. Consequently, a second polarization conversion is triggered by enzyme catalysis, resulting in the recovery of an anodic photocurrent. Benefited from the polarization conversion, a PEC biosensor with a feature of two-wing signal switch is designed, which remarkably enlarges the range of the signal response and subsequently improves the analytical performance. As a result, ALP in small volume of human serum can be quantified with this method. In this work, polarization of perovskite-based photoactive materials is tuned, proposing an alternative perspective on the design of advanced PE systems.
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