MACROMOLECULAR MATERIALS AND ENGINEERING
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2019
·Vol. 304
·期 7
·1900087
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IF 3.038
Sirui Jiang,Kang Wang,Yu Dai,Xiaojin Zhang,Fan Xia
Gold nanorod (AuNR)-embedded poly( N -isopropylacrylamide) (PNIPAM) hydrogels offer the possibility of achieving near-infrared (NIR) light-triggered drug release. In addition, using nanoparticles as a crosslinker can enhance the mechanical properties of PNIPAM hydrogels, and nanoparticle-crosslinked hydrogels provide an important approach for dual drug release. Here, NIR light-triggered dual drug release using AuNR-embedded thermosensitive nanogel-crosslinked hydrogels is reported for the first time. Two kinds of drugs are encapsulated, one in the nanogel and the other in the hydrogel. The volume phase transition of the PNIPAM hydrogels is induced by NIR light by utilizing the photothermal effect of AuNRs. By changing the number of embedded AuNRs and the intensity of NIR light, the release rate and drug quantity can be adjusted for on-demand release. Because of its NIR light-triggering and nanoparticle-crosslinking capabilities, AuNR-embedded thermosensitive nanogel-crosslinked hydrogels may expand the application scope of hydrogels and provide enhanced properties in their applications.
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Royal Society Open Science
·
2019
·Vol. 6
·期 3
·
IF 2.515
Fei Wang,Juangang Wang,Yunhuan Cheng
In this paper, a novel photocatalyst CNCC with excellent visible light photocatalytic performance was successfully prepared to optimize the CO2 photoreduction performance. The results showed that the methanol formation rate of CNCC was 24.7 µmol g−1 h−1, which was 1.42 times higher than that of NCC. The enhanced photoactivity is attributed to the rapid propagation of charge carriers induced by light from the constructed composite structure.
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PubMed
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 2
·319-324
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IF 1.071
Wang Junlin,Yi Yongjie,Li Mengjia,Chang Yue,Zha Fei
Graphitic carbon nitride(g-C 3 N 4 ) microspheres supported α-FeO(OH) hybrids[α-FeO(OH)/g-C 3 N 4 ] were prepared by means of a self-assembly method in deionized water. By UV-visible diffuse reflectance spectroscopy, it has been confirmed that α-FeO(OH)/g-C 3 N 4 has a wider absorption range than g-C 3 N 4 . The feature of α-FeO(OH)/g-C 3 N 4 can be attributed to the efficient separation of the electron-hole pairs with photoluminescence spectra. The degradation rate of methyl orange(MO) is up to 99% under the optimal conditions of 110 min, initial concentration of 30 mg/L, an α-FeO(OH)/g-C 3 N 4 dosage of 15 mg as well as visible light. The mechanism for this photocatalytic reaction was proposed, with hydroxyl radicals being a major active catalytic species.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yaju Zhou,Jinze Li,Chongyang Liu,Pengwei Huo,Huiqin Wang
A multiple transmission channels, heterojunction and 3D PCN/AgBr/rGO photocatalyst was successfully synthetized by introducing the reduced graphene oxide (rGO) covering AgBr onto the surface of 3D porous g-C 3 N 4 (PCN). In PCN/AgBr/rGO, PCN as a semiconductor photocatalyst provides the 3D framework, the heterojunction was formed with AgBr particles and PCN, rGO promotes the electron transfer simultaneously and introduces a multiple transmission channels system to increase the active species. Thanks to the heterojunction formed between PCN and AgBr, resulting rapid separation of photo-generated e − /h + at interface. The 3D PCN/AgBr/rGO nanocomposite exhibits excellent photocatalytic efficiencies for tetracycline (TC) up to 78.4% within 90 min and 2,4-dichlorophenol (2,4-DCP) up to 68.2% within 6 h. The photocatalytic rate of PCN/AgBr/rGO was much higher than 3D PCN (21%), AgBr particles (31%) and most of g-C 3 N 4 -based photocatalysts in TC degradation. Moreover, the PCN/AgBr/rGO shows high photocatalytic stability due to the significantly photocatalytic stability after four photo-degradation cycles. This study highlights the potential application of PCN/AgBr/rGO highly efficient waste water purification.
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JOURNAL OF CONTROLLED RELEASE
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2018
·
IF 7.877
Hao-Ran Jia,Ya-Xuan Zhu,Ke-Fei Xu,Xiaoyang Liu,Fu-Gen Wu
The past decade has witnessed a growing number of nanoparticulate drug delivery systems for cancer treatment. However, insufficient cellular uptake by cancer cells and the undesirable endo/lysosomal entrapment of internalized therapeutic drugs remain the “Achilles heel” of many developed nanoagents. Here, we develop a novel lipid raft-responsive and light-controllable polymeric drug for efficient cytosolic delivery of photosensitizers . Conjugating a photosensitizer protoporphyrin IX (PpIX) to a polyethylene glycol-cholesterol polymer affords the amphiphilic drug (denoted as Chol−PEG−PpIX) that forms micelles in aqueous solutions. The Chol−PEG−PpIX with two hydrophobic units (cholesterol and PpIX) showed robust binding to plasma membranes and enabled significant cellular uptake via two pathways: (1) cholesterol moiety triggered the lipid raft-mediated endocytosis of Chol−PEG−PpIX with minimized endo/lysosomal trafficking after internalization; (2) the membrane-bound PpIX acted as a light-controlled trigger and can augment the permeability of plasma membranes upon laser irradiation, allowing the rapid influx of extracellular Chol−PEG−PpIX within 5 min. For systemic drug delivery, Chol−PEG−PpIX was anchored on the surface of liposomes via in situ membrane modification, which substantially avoided nonspecific binding of Chol−PEG−PpIX to red blood cells during circulation. Besides, the Chol−PEG−PpIX-anchored liposomes exhibited enhanced in vivo fluorescence , reduced liver uptake, prolonged tumor retention, and effective tumor ablation by photodynamic therapy . This work illustrates a new strategy for direct and efficient cytosolic delivery of photosensitizers, which may hold great promise in cancer therapy.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 5
·2718-2726
·
IF 2.956
Hong Chen,Yao Wang,Jianhui Lin,Minmin Shuai,Haidi Zhu,Wengong Zhang,Qidan Ling
Herein, a novel transparent phenyl vinyl silicone resin nanocomposite containing exfoliated fluorescent Eu-containing hydrotalcite-like compound (EFHSN) is developed to serve as a dual role of color conversion and encapsulation material. Excited by near-NUV light, the EFHSN emits a strong characteristic red light (614 nm). Meanwhile, the EFHSN shows not only excellent transparency ( T > 95%) in the UV-Vis region and high refractive index (1.46) but also superior thermal stability, which could meet the need of commercial encapsulation materials and optical application. Therefore, the EFHSN is expected to be used in InGaN-based NUV light-emitting diodes and flexible optoelectronic device.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Ri-Long Yang,Ying-Jie Zhu,Fei-Fei Chen,Dong-Dong Qin,Zhi-Chao Xiong
Stimulus-responsive actuators that can respond to the external stimuli and convert external energy into dynamic movement behaviors are highly desired for many applications. Among various driving schemes, the Marangoni propulsion produced by the photothermal effect is promising for yielding stimulus-responsive motion in a contactless and switchable manner. However, challenges still remain, especially for the fluid drag and poor processability. Herein, a flexible, superhydrophobic, and photothermal paper based on ultralong hydroxyapatite nanowires has been developed for controllable light-driven self-propelled motion. The highly stable superhydrophobicity introduces a thin air layer between the floating superhydrophobic photothermal paper and water surface to reduce the fluid drag. In addition, the photothermal effect produces the Marangoni flow that results in the controllable light-driven motion. The motional direction and speed can be controlled by adjusting the position of the irradiated light and light power density. More importantly, because of the high flexibility and excellent processability of the as-prepared superhydrophobic photothermal paper, various light-driven self-propelled actuators with designed morphologies can be prepared through simple curling and cutting to achieve specific movement behaviors. The present work will inspire the development of high-performance paper-based self-propelled actuators for applications in various fields such as microrobots, environment protection, and biomedicine.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Yang Yu,Yanwei Li,Yanhui Li,Hengguo Wang,Qinghui Zuo,Qian Duan
In this study, a novel 1D porphyrin-based polymer, polyphenylporphyrin benzobisoxazole, namely P(PPor-BBO), was synthesized via polycondensation between 5, 15-bis(4-carboxyphenyl)-10, 20-diphenylporphyrin and 4,6-diaminoresor-cinol dihydrochloride. The P(PPor-BBO) is a 1D fully-conjugated heterocyclic aromatic polymer with co-linear and co-planar rigid backbone. Extended fully π-conjugated systems not only enhance chemical stability and lead to insolubility, but also improve photocatalytic active units and light-harvesting capability in the visible-light region . As a result, P(PPor-BBO) shows excellent photocatalytic performance for rhodamine B degradation (150 min, 98%) under visible-light irradiation. It also exhibits easy recyclability and sustainability, indicating it could be as environmentally-friendly catalyst for organic dye wastewater treatment.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Ying Wu,Yuelin Wei,Qiyao Guo,Hui Xu,Ling Gu,Feiyue Huang,Dan Luo,Yunfang Huang,Leqing Fan,Jihuai Wu
A series La-doped WO 3 /SrTiO 3 heterojunctions photocatalyst were successfully prepared using solvothermal method . The as-fabricated heterostructures composite included La-doped WO 3 fluff spheres tightly grew on the surface of SrTiO 3 cubic particles. The crystallanity, structural, morphological and optical features of the catalysts were characterized using several techniques including XRD , XPS , SEM, TEM UV−vis and HRTEM. The photocatalytic activity of the heterojunction was evaluated by the photocatalytic degradation of methyl orange (MO) under visible-light irradiation. The influence of La doping and SrTiO 3 molar ratio on heterojunctions photocatalysts was investigated. Among the as-prepared photocatalysts, the LWS50 sample exhibited the highest photocatalytic activity , almost 100% MO were completely decomposed within 75 min under visible light irradiation (λ > 420 nm). Compared with the pure WO 3 and SrTiO 3 , the enhancement of photocatalytic activity was mainly attributed to the three-dimensional hierarchical structure and the effectively transfer and separation of photogenerated electron–hole pairs in La doped WO 3 and SrTiO 3 heterojunctions
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 5
·45784
·
IF 1.86
Peiyao Yan,Wei Zhao,Liang Jiang,Bo Wu,Kai Hu,Ye Yuan,Jingxin Lei
Thermoset shape-memory polymers (SMPs) are widely applied because of their superiority in maintaining permanent shapes. However, the inferiority of this material is also conspicuous, namely the loss of reprocessing ability owing to the chemically crosslinked structure. Fortunately, a new class of SMPs, known as “vitrimers,” was discovered, which can be reshaped or reprocessed via topological rearrangement due to the existence of dynamic covalent bonds. Thus, this new thermoset SMP could become a novel solution. In this paper, carbon nanotube–polyurethane vitrimer (CNT-PUV) composites have been prepared, which possess the capability of thermally induced shape memory based on entropy changes and thermal reconfiguration based on transcarbamoylation reactions of carbamate bonds. In addition, the introduction of CNTs endows them with properties of near-infrared (NIR) triggered shape memory and reconfiguration due to the photothermal conversion effect of CNTs. Besides, due to the character of the NIR laser, step-by-step shape recovery of CNT-PUVs is realized from predefined temporary shapes to a permanent shape. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45784.
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Advanced Optical Materials
·
2017
·Vol. 5
·期 20
·1700377
·
IF 6.875
Hua Wu,Yu Zhang,Xiaoyu Zhang,Min Lu,Chun Sun,Tieqiang Zhang,William W. Yu
Perovskite has been considered to be a promising optoelectronic material due to its superior properties, yet, it are strongly sensitive to oxygen and water, especially when applied in devices. Here, a highly efficient and stable light-emitting device (LED) is reported by applying solution-processed Mg-doped ZnO (MZO) nanocrystals (NCs) as an interfacial layer. The effect of Mg doping on the optical and electronic properties of NCs is investigated. This study demonstrates that the air stability of perovskite NC film is significantly enhanced because of the decreased oxygen vacancy surface sites of MZO NCs. Incorporation of a MZO layer with favorable electronic energy level to form a suitable band alignment promotes electron injection and enhances the LED performance. Compared to the device without MZO, the LED shows 3059 cd m −2 of luminance, with 1.9 times enhanced current efficiency and 2 times increased external quantum efficiency. In addition, the device with MZO also exhibits better stability. This research provides a potential strategy for realizing stable and efficient perovskite LEDs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Fei Li,Yong Wang,Jian Du,Yong Zhu,Congying Xu,Licheng Sun
Water oxidation as a multi-electron transfer and endothermal reaction has been considered to be the bottleneck of solar-driven water splitting into oxygen and hydrogen. Herein, an alternative approach for solar energy conversion is developed by coupling H 2 generation with the selective oxidation of alcohol. In a closed redox system containing molecular ruthenium catalyst (RuCat) and Pt modified g-C 3 N 4 (Pt-g-C 3 N 4 ) composite, hydrogen production is concomitant with the oxidation of benzyl alcohols to aldehydes with over 99% selectivity in the presence of visible light and pure water. By contrary, the system lacking molecular catalyst only exhibits low to moderate selectivities towards aldehydes. The remarkably improved selectivity is attributed to the formation of highly active Ru(IV) = O intermediate through efficient hole transfer from g-C 3 N 4 to RuCat.
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