JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 52
·期 14
·8455-8464
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IF 2.599
Qin Jingjing,Chen Lang,Zhao Chenghui,Lin Qixiang,Chen Shaowei
A novel porous aerogel of cellulose nanofiber (CNF)/cationic water-soluble poly[9,9-bis[3′-( N,N -dimethy)- N -ethylammonium)propyl)-2,7-fluorene- alt -1,4-phenylene]dibromide (CPFD) is prepared by freeze drying. CNF can effectively prevent aggregation of the conjugated polymer CPFD backbones. The CNF/CPFD hybrid aerogel is use for the detection of nitroaromatic (NAC) vapors. Due to the porous structure, the CNF/CPFD hybrid aerogel possesses a large number of accessible cavities, which could be sufficiently large to allow the diffusion of NAC vapors into the aerogel. As a result, the CNF/CPFD aerogel sensor shows high sensitivity toward NAC vapors. For 120-s exposure, the fluorescence quenching efficiency of the CNF/CPFD aerogel sensor toward 2,4-dinitrotoluene vapor is up to 85.9%, which is much larger than that of the spin-cast CPFD film. Furthermore, the sensing performance of the CNF/CPFD hybrid aerogel is not heavily dependent on the thickness, and the sensing process of the CNF/CPFD aerogel sensor is reversible.
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Journal of Energy Chemistry
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2016
·
IF 2.322
Qi Wang,Neeraj Gupta,Guodong Wen,Sharifah Bee Abd Hamid,Dang Sheng Su
Vanillyl alcohol, which is made up of an aromatic ring , an alcoholic hydroxyl group, a phenolic hydroxyl group and a methoxy group, was selected as the model molecule of lignin. Various carbon materials supported Pd catalysts were chosen to catalyze the HDO of vanillyl alcohol. The catalysts were characterized via TEM, TPD, XRD, XPS and CO-chemisorption. It was found that different carbon materials could obviously influence the particle sizes, dispersion and distribution of Pd or PdO particles. Palladium and carbon can synergistically catalyze the room-temperature HDO of vanillyl alcohol even at room temperature, and the carboxyl group was found to be the effective active acid site during the reaction. Possible reaction mechanism was also proposed. The existence of the effective active acid sites on the carbon supports could obviously lower the reaction temperature without decreasing the selectivity, as a result, making the production of renewable fuels by HDO much more economically feasible, which is of much importance.
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RSC Advances
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2016
·Vol. 6
·期 100
·97912-97920
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IF 3.289
Chuanting Liu,Ziqiang Shao,Jianquan Wang,Chengyi Lu,Zhenhua Wang
A novel eco-friendly polyvinyl alcohol/cellulose nanofiber–Li+ (PVA/CNF–Li) composite separator was prepared for lithium-ion batteries. In this membrane by a non-solvent induced phase separation (NIPS) wet-process, CNF–Li originating from wood pulp was successfully prepared and characterized by FT-IR and TEM. The composite separators showed excellent porosity of over 60%, and better ionic conductivity (∼1.1 mS cm−1) as well as remarkable electrolyte uptake approaching 2.3. CNF–Li combined the excellent properties of both nanofibers and ion-conductive polymers such as CMC–Li. The introduction of CNF–Li in the separator increased the thermal dimensional stability and mechanical performance. Simultaneously, CNF–Li as a constituent in the membrane increased the contents of Li+, opening a way for Li+ transportation to improve batteries' Li+ diffusion efficiency and specific capacity. The battery with a 2 wt% CNF–Li separator retained 93% of the initial reversible capacity after 50 cycles, which was much higher than that of the commercial polypropylene (PP) separator with a value of 80%. The PVA/CNF–Li composite membrane produced via a relatively low cost and eco-friendly method can serve as a potential alternative of commercial PP separators applied in high-performance lithium-ion batteries.
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BIOSENSORS & BIOELECTRONICS
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2017
·
IF 7.78
Jin Peng,Xianfeng Hou,Fang Zeng,Shuizhu Wu
Drug-induced organ damages have been considered as a grave problem regarding public health; hence effective method for in vivo detection of drug-induced organ damages is of great significance. Herein we developed a ratiometric fluorescent nanoprobe (NPs-A), which was prepared by loading the probe molecules into phospholipid bilayer, for assaying hydrogen peroxide (H 2 O 2 , an organ damage biomarker) level in vivo. The photophysical behavior of the probe molecule depends on the electron-withdrawing ability of the group at the 6- position of anthracene ring, on which the recognition moiety for hydrogen peroxide (dicarbonyl coupled with nitrophenyl, referred to as nitrophenyl-dicarbonyl) was introduced. Upon the reaction of the probe with H 2 O 2 , nitrophenyl-dicarbonyl group transforms into carboxyl group, and due to the variation of the electron-withdrawing ability of the 6th substituent , the fluorescent properties of the probe molecule alters accordingly, thus ensuring the ratiometric detection for H 2 O 2 with high selectivity with the detection limit of 0.49 μM. In addition, the nanoprobe (NPs-A) was applied for cell and in vivo imaging applications; and the results indicate that it can detect and track the level of H 2 O 2 in living cells and to monitor and spatially map endogenous H 2 O 2 levels in a drug-induced organ damage model of zebrafish.
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INDUSTRIAL CROPS AND PRODUCTS
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2017
·
IF 3.181
Xue Yang,Fuyi Han,Chunxia Xu,Shuai Jiang,Liqian Huang,Lifang Liu,Zhaopeng Xia
The aim of this work is to improve the economic value of corn husk, and to make better use of corn husk nanocellulose (NC). Corn husk NC was extracted via acid hydrolysis, TEMPO oxidation and high intensity ultrasonication methods, which was named AH-NC, TO-NC and US-NC, respectively. The NC was carefully characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and particle size and zeta potential analyzer. The results showed the preparation methods didn’t change the main chemical structure of cellulose. The crystallographic form of the three kinds of NC still was cellulose I. However, the effects of preparation methods on the morphology and properties were obvious. Among the three kinds of NC, TO-NC had the largest aspect ratio, and the best dispersion stability in diameter, but very low thermal stability. The AH-NC exhibited the highest crystallinity and best thermal stability, but a small aspect ratio. US-NC possessed low crystallinity and poor dispersion stability.
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Soft Matter
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2017
·Vol. 13
·期 18
·3352-3358
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IF 3.889
Xiuyan Ren,Chang Huang,Lijie Duan,Baijun Liu,Lvjun Bu,Shuang Guan,Jiliang Hou,Huixuan Zhang,Guanghui Gao
Toughness, strechability and compressibility for hydrogels were ordinarily balanced for their use as mechanically responsive materials. For example, macromolecular microsphere composite hydrogels with chemical crosslinking exhibited excellent compression strength and strechability, but poor tensile stress. Here, a novel strategy for the preparation of a super-tough, ultra-stretchable and strongly compressive hydrogel was proposed by introducing core–shell latex particles (LPs) as crosslinking centers for inducing efficient aggregation of hydrophobic chains. The core–shell LPs always maintained a spherical shape due to the presence of a hard core even by an external force and the soft shell could interact with hydrophobic chains due to hydrophobic interactions. As a result, the hydrogels reinforced by core–shell LPs exhibited not only a high tensile strength of 1.8 MPa and dramatic elongation of over 20 times, but also an excellent compressive performance of 13.5 MPa at a strain of 90%. The Mullins effect was verified for the validity of core–shell LP-reinforced hydrogels by inducing aggregation of hydrophobic chains. The novel strategy strives to provide a better avenue for designing and developing a new generation of hydrophobic association tough hydrogels with excellent mechanical properties.
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RSC Advances
·
2025
·Vol. 15
·期 4
·2554-2561
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IF 4.6
Weishuai Han,Hui Xu,Fengqi Qiu,Jinwei Liu,Haojie Gu,Zhenhua Xue
Corn stover was used as raw material, and purification, oxalic acid treatment, oxidation treatment, and ultrasonic treatment were performed to realize the preparation of corn stover nanocellulose with low energy consumption. The effects of oxalic acid concentration (1 wt%, 2 wt%, 3 wt%, 4 wt%, and 5 wt%) on the purity, morphology, crystalline structure and oxidation efficiency of corn stover cellulose during oxalic acid treatment were investigated. The controllable preparation of corn stover nanocellulose was achieved by changing the parameter conditions of ultrasonic treatment. The optimal oxalic acid treatment conditions at room temperature were determined as follows: oxalic acid concentration of 3 wt% and treatment time of 24 h. Oxidized corn stover cellulose was ultrasonically pulverized at 480 W. The average particle size of cellulose was 78.5 d nm at 80 min, which reached 9.75 d·nm at 120 min. This study realized the controllable preparation of corn stover nanofibrillar cellulose, thus providing a research basis for further improving the high value-added conversion of corn stover.
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CARBOHYDRATE POLYMERS
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2024
·
IF 10.7
Shuhao Jiao,Xuefei Yang,Xuejing Zheng,Ying Pei,Jie Liu,Keyong Tang
The present work investigates the effects of nano-chitin with different charge, obtained by acid hydrolysis and TEMPO oxidation , on the structure and properties of borax crosslinked polyvinyl alcohol (PVA) hydrogels. In detail, nano-chitin prepared by acid hydrolysis (ACh) is positively charged (+28.8 mV). The electrostatic attraction between ACh and borax ions leads to a maximum tensile stress of composite hydrogel (ACh/PB), 54.25 KPa, 17 times of the borax crosslinked PVA (PB). In contrast, nano-chitin prepared by TEMPO-oxidation (TCh) shows negative charge (−59.0 mV). Due to the electrostatic repulsion with borax ions, the maximum tensile stress of composite hydrogel (TCh/PB) is only 9.25 KPa, a very limit reinforcing effect. However, TCh/PB showed better self-healing efficiency (96.0 %) as well as ionic conductivity (1.25 × 10 −5 S/m). The present work shows that the charge state of the nano-chitin exerts great influence on the interaction with the crosslinking agent borax, therefore, affects the structure and properties of the final PVA composite hydrogels. The results could provide important information about making full use of nano-chitin as a reinforcement by adjusting its surface charge state.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Zhen Chen,Ziqi Zhang,Yixin Yu,Yu Guo,Jing Liu,Zhiling Zhu
A universal theory for predicting the catalytic activity of hydrolytic nanozymes has yet to be developed. Herein, by investigating the polarization and hydrolysis mechanisms of nanomaterials towards amide bonds, carbocation charge was identified as a key electronic descriptor for predicting catalytic activity in amide hydrolysis. Through machine learning correlation analysis and the Sure Independence Screening and Sparsifying Operator (SISSO) algorithm, this descriptor was interpreted to associate with the d-band center and Lewis acidity on the nanomaterial surface. On this basis, copper nanoparticles (Cu NPs) were discovered to exhibit significant hydrolytic activity. Further, peptidomic analysis and molecular dynamics simulations showed that Cu NPs demonstrated substrate selectivity. In the presence of water molecules, hydrophobic amino acid residues were driven towards the nanomaterial surface by hydrophobic groups of proteins, leading to the preferential hydrolysis of peptide bonds linked to these residues. This study provided a theoretic framework for predicting highly efficient hydrolytic nanozymes with broad potential applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Zhiming Lai,Yang Yang,Zhou Yang,Wenqi Ruan,Can Yang,Qiang Chen,Kaining Ding,Jinshui Zhang,Yidong Hou
The development of durable and highly efficient visible-light-driven photocatalysts is essential for the photocatalytic ozonation process towards degrading organic pollutants. This study presents CN-MA, a novel photocatalyst synthesized by grafting carbon nitride (CN) with single-atom Mn and 2-hydroxy-4,6-dimethylpyrimidine (HDMP) via one-step thermal polymerization. Experimental characterization and theoretical calculation results reveal that incorporating single-atom Mn and HDMP into CN alters the charge density distribution on the heptazine rings. This modification enhances the absorption of visible light and reduces exciton binding energy, leading to improved separation and migration of photogenerated charge carriers. Moreover, the single-atom Mn provides abundant active sites for O 3 adsorption and activation, which increases the utilization of photogenerated electrons to produce highly reactive oxidative species. Consequently, CN-MA exhibits superior photocatalytic ozonation activity, achieving 94% mineralization of phenol within 60 min and maintaining excellent stability over multiple cycles. The research also proposes a plausible reaction mechanism based on free-radical trapping experiments and steady-state concentration experiments using molecular probes. This strategy advances the development of molecular-engineered catalysts co-modified with single metal atoms, thereby enhancing the photocatalytic ozonation process for the degradation of organic pollutants.
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Asian Journal of Pharmaceutical Sciences
·
2024
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IF 10.7
Quanfu Zeng,Hongkai Chen,Zhuxian Wang,Yinglin Guo,Yufan Wu,Yi Hu,Peiyi Liang,Zeying Zheng,Tao Liang,Dan Zhai,Yaling Guo,Li Liu,Chunyan Shen,Cuiping Jiang,Qun Shen,Yankui Yi,Qiang Liu
Acne vulgaris ranks as the second most prevalent dermatological condition worldwide, and there are still insufficient safe and reliable drugs to treat it. Cryptotanshinone (CTS), a bioactive compound derived from traditional Chinese medicine Salvia miltiorrhiza , has shown promise for treating acne vulgaris due to its broad-spectrum antimicrobial and significant anti-inflammatory properties. Nevertheless, its local application is hindered by its low solubility and poor skin permeability. To overcome these challenges, a carrier-free pure drug self-assembled nanosystem is employed, which can specifically modify drug molecules based on the disease type and microenvironment, offering a potential for more effective treatment. We designed and synthesized three distinct structures of cationic CTS-peptide conjugates, creating self-assembled nanoparticles. This study has explored their self-assembly behavior, skin permeation, cellular uptake, and both in vitro and in vivo anti-acne effects. Molecular dynamics simulations revealed these nanoparticles form through intermolecular hydrogen bonding and π-π stacking interactions. Notably, self-assembled nanoparticles demonstrated enhanced bioavailability with higher skin permeation and cellular uptake rates. Furthermore, the nanoparticles exhibited superior anti-acne effects compared to the parent drug, attributed to heightened antimicrobial activity and significant downregulation of the MAPK/NF-κB pathway, leading to reduced expression of pro-inflammatory factors including TNF-), IL-1β and IL-8. In summary, the carrier-free self-assembled nanoparticles based on CTS-peptide conjugate effectively address the issue of poor skin bioavailability, offering a promising new approach for acne treatment.
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ACS Applied Polymer Materials
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2024
·
IF 4.4
Yueshan Li,Da Li,Weihao Yuan,Yibo Shen,Zhen Hu
Conventional epoxy resins have high cross-linking density and rigid molecular structures, which make them difficult to develop into flexible elastomers. Here, inspired by the cuticle of the marine mussel byssi, we incorporate reversible Fe3+–carboxyl cross-links into a cross-linked epoxy network through a transformation between chemical cross-links and physical cross-links to realize the construction of a dynamic cross-linked network in traditional epoxy resins. Dynamic cross-linking networks and long flexible chain segments endow the epoxy system with excellent stretchable properties. Carbon nanotubes coated with ferric oxide (Fe3O4) nanoparticles were synthesized and added to the epoxy system, reinforcing the epoxy system. The synergistic combination of the modified molecular structure and nanohybrid endows the epoxy system with 550% elongation at break, a tensile strength of 1.4 MPa, and the ability to respond quickly to an applied magnetic field. An ultrasensitive strain sensor was constructed from synthetic epoxy hybrid materials; the GF (strain coefficient) of the strain sensor was up to 344.32. This research will be beneficial in expanding the application range of traditional epoxy polymer materials in the emerging sensor field.
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