LIQUID CRYSTALS
·
2021
·
IF 0
Xiangshen Meng,Jian Li,Yueqiang Lin,Xiaodong Liu,Ningning Liu,Wenjiang Ye,Decai Li,Zhenghong He
The polymer dispersed liquid crystal films doped with the low concentration γ-Fe2O3 nanoparticles coated with oleic acid were inverstigatited. The experimental results showed that the doped and un-doped polymer dispersed liquid crystal films were the similar surface morphologies, however their evolving curves of the capacitance with the applied voltage were different, as well as the transmission rate. The interpretations based on these differences were proposed, i.e. those came from the adsorbed free ions by the γ-Fe2O3 nanoparticles, instead of the electromagnetic properties of the γ-Fe2O3 nanoparticles. The effect of the free ions is equivalent to the negative dielectric constant and refractive index. Furthermore, the reduction of the free ion concentration due to the absorption in the doped polymer dispersed liquid crystal films can decrease the negative dielectric constant and refractive index, i.e. the effective dielectric constant and refractive index were increased. As a result, the contrast ratio increased significantly, and the driving and threshold voltages decreased distinctly. These results may be useful for electro-optics devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Wang Lei,Guo Shaoyun,Chen Qin,Zhang Xianlong
At present, most leuco-dye-doped dosimeters exhibit detection limits for γ-rays in the range of tens to hundreds of Gy, which remains insufficient for numerous industrial and medical applications requiring lower radiation doses. Herein, a novel highly sensitive photonic hydrogel radiochromic film is reported. This is the first fabrication of methacrylic anhydride modified Gelatin (GelMA) based carbon-coated Fe 3 O 4 nanoparticles (Fe 3 O 4 @C NPs) film with a magnetic field-induced one-dimension (1-D) periodic structure for γ-irradiation detection. Upon exposure to γ-irradiation, the active vinyl-containing GelMA matrix undergoes cross-linking-induced volume contraction, leading to alterations in the periodic structure of Fe 3 O 4 @C NPs and consequent structural color changes. This photonic film exhibits a high sensitivity of radiochromic behavior, displaying clear green change even at a low dosage of 5 Gy γ-ray. This magnetic field-induced construction of the photonic periodic structure is a much simpler method than that of typical opal or inverse opal. In addition, optimized radiochromic behaviors are achieved by choosing appropriate nanoparticles (e.g., sizes or additive amounts). Graphical
研究领域:
材料科学
·
放射医学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 3
·217
·
IF 5.3
Xiaoqing Jia,Shige Wang
Efficient and precise cancer therapy remains a challenge due to limitations in current treatment modalities. In this study, we developed a multifunctional hydrogel system that integrates photothermal therapy (PTT) and chemotherapy to achieve combined tumor treatment. The hydrogel, composed of γ-polyglutamic acid (γ-PGA), fifth-generation polyamide-amine dendrimers (G5), and polydopamine (PDA) nanoparticles, exhibits high photothermal conversion efficiency and temperature-responsive drug release properties. The hydrogel exhibited a high photothermal conversion efficiency of 45.6% under 808 nm near-infrared (NIR) irradiation. Drug release studies demonstrated a cumulative hydrophilic anticancer drug doxorubicin DOX release of 79.27% within 72 h under mild hyperthermia conditions (50 °C). In vivo experiments revealed a significant tumor inhibition rate of 82.3% with minimal systemic toxicity. Comprehensive in vitro and in vivo evaluations reveal that the hydrogel demonstrates excellent biocompatibility, photothermal stability, and biodegradability. Unlike conventional hydrogel systems, our γ-PGA-based hydrogel uniquely integrates a biocompatible and biodegradable polymer with polydopamine (PDA) nanoparticles, providing a smart and responsive platform for precise cancer therapy. This multifunctional hydrogel system represents a promising platform that combines PTT precision and chemotherapy efficacy, providing a robust strategy for advanced and safer cancer treatment.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE RESEARCH
·
2012
·
IF 2.332
Liqiang Wu,Zhikui Yin
A simple and clean synthesis of per- O -acetylation carbohydrate derivatives has been accomplished by treatment of sugars with a stoichiometric quantity of acetic anhydride under solvent-free conditions in the presence of sulfonic acid functionalized nano γ-Al 2 O 3 as an efficient and environmentally benign catalyst.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·330-337
·
IF 3.201
Chaoping Yuan,Wentao Shi,Peng Chen,Huaxin Chen,Lihua Zhang,Gang Hu,Longming Jin,Haibo Xie,Qiang Zheng,Shengjun Lu
Cellulose dissolution is crucial for its regeneration and the application of its derivative materials. In this study, the dissolution of cellulose in γ-valerolactone (GVL), promoted by 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), was investigated and 15 wt% α-cellulose was rapidly dissolved by the designed mixed organic electrolyte solvents (OESs) at 80 °C in 1 h. The rheological study indicated that the activation energy of dissolution is lower than that in pure [Emim]OAc, and the overlap concentration was determined to be C* = 1.7 wt%. The viscosity of the α-cellulose solution overlapped well with the complex viscosity, suggesting that the Cox–Merz law is valid therein. The potential of the solution for homogeneous derivatization through transesterification of α-cellulose with vinyl esters was also investigated at 80 °C in 4 h with a low vinyl ester/anhydroglucose unit (AGU) molar ratio of 3, achieving a cellulose laurate ester with a DS = 3.0, cellulose pivalate ester with a DS = 3.0 and cellulose chloroacetate ester with a DS = 1.43.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 6
·530
·
IF 4
Yalin Guo,Zhuang Ma,Binbin Jin,Limin Ma,Guodong Yao
The sustainable valorization of lignocellulosic biomass into high-value platform chemicals presents a crucial pathway for reducing reliance on fossil resources. Gamma (γ)-valerolactone (GVL) has gained recognition as a versatile bio-derived compound with broad applications in renewable energy systems and green chemical synthesis. While conventional GVL production strategies from carbohydrate biomass typically depend on noble metal catalysts paired with high-pressure hydrogen gas, these approaches face substantial technical barriers including catalyst costs, hydrogen storage requirements, and operational safety concerns in large-scale applications. This work develops an innovative catalytic system utilizing earth-abundant iron for in situ hydrogen generation through water splitting, integrated with Raney Ni as the hydrogenation catalyst. The designed two-stage process enables direct conversion of cellulose—first through acid hydrolysis to levulinic acid (LA) followed by catalytic hydrogenation to GVL without intermediate purification. Through systematic parameter optimization, a remarkable 61.9% overall GVL yield from cellulose feedstock was achieved. Furthermore, the methodology’s versatility was demonstrated through wheat straw conversion experiments, yielding 24.6% GVL. This integrated methodology explores a technically feasible pathway for direct cellulose-to-GVL conversion utilizing abundant water as the hydrogen source, effectively overcoming the critical limitations associated with conventional hydrogenation technologies regarding hydrogen infrastructure and process safety.
研究领域:
生物化学
·
可再生能源
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinyu Wang,Mingyang Hu,Yun Liu
This study investigates a one-step process for the simultaneous separation of cellulose, hemicellulose, and lignin from lignocellulosic biomass using γ-valerolactone (GVL)/H 2 O pretreatment, which also converts hemicellulose to furfural (FF). A response surface methodology (RSM) was applied to optimize the process parameters. Under optimal conditions (163 °C for 1.5 h), the maximum FF yield reached 85.36 %, and cellulose purity was 80.80 %. The extracted GVL-lignin was characterized as low-molecular-weight guaiacyl-syringyl (G-S) type nanospheres with significant antioxidant activity. The conversion of hemicellulose to FF was enhanced by the synergistic interaction of Lewis acid (MgCl 2 ) and Brønsted acid (H 2 SO 4 ), which promoted the isomerization of xylose and dehydration to FF. The high-purity cellulose yielded 18.87 g/L ethanol through separate hydrolysis and fermentation (SHF), 27 times higher than untreated solids. Additionally, GVL exhibited consistent performance in lignocellulose separation after six cycles. This method offers an efficient and sustainable approach to valorize lignocellulosic biomass, advancing the production of high-value products.
研究领域:
生物化学
·
可再生资源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2016
·
IF 4.312
Kun Jiang,Dong Sheng,Zihao Zhang,Jie Fu,Zhaoyin Hou,Xiuyang Lu
Mixed MgO–Al 2 O 3 (with different Mg/Al ratio) supported nickel catalysts were prepared via co-precipitation method and used for hydrogenation of levulinic acid to γ-valerolactone under mild condition. Characterization results indicated that mixed MgO–Al 2 O 3 supported Ni catalysts possessed bigger surface area than that of Ni/MgO and Ni/Al 2 O 3 , and Ni dispersed highly on the surface of mixed MgO–Al 2 O 3 support. It was found that mixed MgO–Al 2 O 3 supported Ni catalysts were more active and selective for the hydrogenation of levulinic acid to γ-valerolactone than that of Ni/MgO and Ni/Al 2 O 3 , and the best yield of γ-valerolactone at 160 °C, 1 h and 3 MPa H 2 reached 99.7% over Ni/MgAlO 2.5 , and Ni/Mg 2 Al 2 O 5 could be recycled without obvious loss of its initial activity.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Haizhou Lin,Jingping Chen,Yuan Zhao,Shurong Wang
To obtain an efficient and green reaction system for the production of furfural (FF), this study investigated the use of a SO3H-functionalized ionic liquid as a catalyst for the conversion of xylose in a solvent of renewable γ-valerolactone (GVL). A high FF yield of 78.12% was obtained in this reaction system catalyzed by 1-propylsulfonic-3-methylimidazolium chloride at 140 °C. The GVL remarkably enhanced the reaction rate and increased the xylose conversion and FF yield because the solvent effect of GVL could improve the catalytic activity of the acidic protons and suppress the side reactions. In addition, the ionic liquids showed satisfactory catalytic performance in the conversion of xylose to FF due to functionalization by introducing a SO3H group. The conversion of other C5 carbohydrates (arabinose and xylan) was also tested in this system, and moderate FF yields were achieved.
研究领域:
生物化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Kunpeng Qian,Shuang Li,Jianhui Fang,Yuhuan Yang,Shaomei Cao,Miao Miao,Xin Feng
Ti 3 C 2 T x MXenes with excellent metallic conductivity and flexibility have shown a promising prospect as electromagnetic interference (EMI) shielding materials. Ultrathin, hierarchical hybrid films were fabricated by using C 60 intercalating Ti 3 C 2 T x MXenes with the assistance of water-soluble γ -cyclodextrin (CD). The C 60 /CD complex was obtained by high-speed vibration milling using hydrophilic CD as dispersing agent. After thermal annealing treatment, the obtained hybrid film exhibited excellent EMI shielding (53.52±0.43 dB), hydrophobicity (water contact angle: 93.7°) and mechanical stability (over 0.9 million bending times). Taking advantage of the antioxidant of C 60 , the chemical durability of Ti 3 C 2 T x MXenes based hybrid films was also improved as expected. These results indicate that the well-designed hierarchical hybrid films with the intercalation of C 60 have promising potential for high-performance EMI shielding applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 33
·期 9
·620-627
·
IF 4.367
Jiaqi Li,Yan Feng,Shengpeng Mo,Hui Liu,Yunfa Chen,Jun Yang
The morphology of the platinum (Pt) nanoparticles has a significant effect on their activity for the catalytic oxidation of the volatile organic compounds (VOCs). In this work, the preparation of the dendritic and spherical Pt by a solution-based approach is reported, which is supported on γ - Al 2 O 3 substrates, for decreasing the temperature of the complete conversion of benzene, one of the representative contaminants among the VOCs because of its carcinogenicity. The X-ray photoelectron spectroscopy analyses reveal that the surface adsorbed oxygen is crucial for catalytic performance, and the electron transference from Pt to O is a benefit for the activation of oxygen. H 2 -TPR results indicate that the reducibility of the catalyst has a significant effect on the catalytic activity for the catalytic oxidation. In general, the dendritic Pt/Al 2 O 3 catalysts, which possess more abundant and active surface adsorbed oxygen, exhibit the higher activity for the complete catalytic conversion of benzene compared with the spherical one. Moreover, the addition of a small amount of Ag (or Au), which is in order to ensure the dendritic structure, has little influence on the catalytic activity. The versatile solution-based synthesis will be a promising method for creating the highly efficient catalysts for environmental remediation.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 29
·4044-4051
·
IF 4.927
Can Wang,Xiaowei An,Minglun Pang,Zhengbiao Zhang,Xiulin Zhu,Jian Zhu,Filip E. Du Prez,Xiangqiang Pan
A versatile protocol for the synthesis of a variety of multiresponsive diselenide-containing polyesters was investigated. It consists of a one-pot, two-step process with the generation of a selenol by nucleophilic ring opening of γ-butyroselenolactone with a broad range of alcohols in situ, followed by the transformation of the obtained compounds to the corresponding diselenides through a spontaneous oxidative coupling reaction. First, the influence of the catalyst choice, alcohol structure, and solvents on the reaction efficiency was examined. After elaboration of this one-pot reaction, a number of routes, all starting from γ-butyroselenolactone, have been developed for the successful synthesis of linear and crosslinked diselenide-containing polyesters via a mild, straightforward process. The structure of diselenide compounds and polymers was carefully characterized by 1H, 13C, 77Se NMR, FT-IR, HRMS, and SEC. In addition, it has been found that the diselenide-containing polyester networks showed fast reprocessing at a mild temperature (70 °C) or by making use of UV irradiation.
研究领域:
材料化学
·
有机化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）