ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Hua Wei,Houchao Jing,Can Cheng,Yaqing Liu,Jingcheng Hao
Severe skin wounds arising from burns, cancers, and accidents can damage the entire tissue structure, resulting in permanent somatosensory dysfunction in patients. Although emerging hydrogel dressings have shown clinical potential for accelerating wound repair, the use of an individual material to synchronously restore the tissue structure and sensory function of defective skin remains a challenge. Herein, a multifunctional hydrogel that combines electroconductive polydopamine-capped graphene nanosheets (PrGOs) embedded in a dynamically crosslinked dual-polysaccharide (xyloglucan and chitosan) matrix network is presented. The fabricated hydrogels have an adjustable modulus that can be matched to skin tissue at the wound site, owing to the dynamic Schiff-based crosslinking as well as the facile photo-triggered secondary crosslinking. Furthermore, the photothermal activity of PrGO can elevate the local temperature up to ≈50 °C, significantly restraining bacterial growth. These two factors jointly promote the regeneration of skin tissue. Tissue adhesion of hydrogels is also reported that offers a conformable and robust interface that can detect and quantify human movement and physiological signals to mimic the human skin somatosensory system. This hydrogel offers an effective one-stone-for-two-birds material that simultaneously achieves tissue regeneration and multi-signal sensing, promoting the restoration and/or replacement of the structure and function of damaged skins.
研究领域:
生物医学工程
·
材料科学
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Wen Wu,Manjing Wang,Limin Liang,Yufei Yan,Xuerong Zheng,Qiuyan Hao,Hui Liu,Jun Zhang,Caichi Liu
The length effects on photoconductivity have been observed in Sb 2 Se 3 nanorods with uniform diameter grown by a hot-injection polyol process. The phase formation and morphology evolution of Sb 2 Se 3 nanorods were investigated by XRD and TEM analysis. By changing the reaction temperature from 150 °C to 250 °C, the sizes and aspect ratios of Sb 2 Se 3 nanorods can be easily controlled, with an average length ranged from 0.6 μm to 3.2 μm. The length-controlled nanorods were directly used for fabricating prototype photodetectors to explore their length-dependence performances. A significant increase of photoresponse with length elongation has been observed, in which the optimal device displays a remarkable response to simulated solar light with a high switching “on/off” ratio of 320, short response/recovery times (0.15/0.16 s) and long-term durability. This length-dependence property on photodetectors can be considered as an important step to promote the performance of 1D Sb 2 Se 3 nanomaterials .
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
DALTON TRANSACTIONS
·
2016
·Vol. 46
·期 1
·33-38
·
IF 4.177
Y. Li,C. Cheng,Y. Lei,M. Wang,R. D. Wan
The antimony-doped half-Heusler thermoelectric bulk TiNiSb0.05Sn0.95 was prepared via ultra-fast 4.5 min microwave synthesis, cold-press forming and 20 min microwave pressureless sintering. The electrical properties i.e. the Seebeck coefficient (S), electrical resistivity (ρ), and carrier concentration (n) and mobility (μ) were measured on a Seebeck coefficient/resistance analysis system (S/RAs) and Hall effect measurement system (HEMS), respectively. The thermal conductivity (κ) was measured on a laser flash thermal analyzer (LFA). The results show that a high purity single phase was obtained after microwave sintering. The electrical resistivity is 2.70–5.33 μΩ m at temperatures ranging from ∼300 to 773 K. The highest power factor of 4042 μW m−1 K−2 was achieved at 473 K. The microstructure analyses show that numerous circular intercrystalline pores caused by microwave sintering are present within the TiNiSn grains. The lattice and total thermal conductivity are 1.76–3.77 and 4.66–5.98 W m−1 K−1. The highest thermoelectric figure of merit of 0.44 was achieved at 623 K.
研究领域:
材料科学
·
凝聚态物理
·
能源材料
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无机非金属材料
·
热电转换
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhongming Wang,Kun Wang,Xiaoying Peng,Qiang Geng,Xun Chen,Wenxin Dai,Xianzhi Fu,Xuxu Wang
The photoconductivity and the gas sensing property of TiO 2 at room temperature under ultraviolet (UV) irradiation were compared with those under visible light irradiation (≥420 nm), respectively. It was found that UV light could cause the photoconductivity of TiO 2 and its sensing response to both ethylene and oxygen, while the visible light at 420 nm could cause the photoconductivity of TiO 2 and its sensing response to oxygen but not to ethylene. This indicates that the photo-assisted gas sensing performance of TiO 2 was dependent on its light-excited behavior: The intrinsic excitation of TiO 2 induced by UV light could produce both the holes and electrons, which exhibited a respective response to ethylene and oxygen, while the extrinsic excitation of TiO 2 induced by visible light maybe only produced the free electrons but not free holes, resulting in only a response to oxygen. Furthermore, it was found that the visible-light enhanced conductivity maybe depend on the Ti–bonded hydroxyls (Ti–OH) at TiO 2 surface. With the removal of Ti–OH by increasing temperature, the visible light could not produce the photoconductivity of TiO 2 . It was proposed that Ti–OH groups act as the shallow trapped level to cause the extrinsic excitation of TiO 2 .
研究领域:
材料科学
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半导体物理
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传感器技术
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光化学
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表面科学
·
纳米材料
✓ 已验证
DOI
高影响因子
AIP Advances
·
2015
·Vol. 5
·期 2
·
IF 1.524
Tang G. W.,Qian Q.,Peng K. L.,Wen X.,Zhou G. X.,Sun M.,Chen X. D.,Yang Z. M.
Phosphate glass-clad optical fibers containing selenium (Se) semiconductor core were fabricated using a molten core method. The cores were found to be amorphous as evidenced by X-ray diffraction and corroborated by Micro-Raman spectrum. Elemental analysis across the core/clad interface suggests that there is some diffusion of about 3 wt % oxygen in the core region. Phosphate glass-clad crystalline selenium core optical fibers were obtained by a postdrawing annealing process. A two-cm-long crystalline selenium semiconductor core optical fibers, electrically contacted to external circuitry through the fiber end facets, exhibit a three times change in conductivity between dark and illuminated states. Such crystalline selenium semiconductor core optical fibers have promising utility in optical switch and photoconductivity of optical fiber array.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Kun Li,Yuxuan Xue,Meng Li,Ammara Arooj,Xuan Zhang
Mass concentration using conventional forward osmosis (FO) membranes has experienced critical issues including membrane fouling and internal concentration polarization effects. In this study, we designed a conductive FO membrane for milk concentration using the proposed electro-FO system. Specifically, the conductive layer, with a thickness of approximately 1 μm, was constructed through in situ polymerization of pyrrole on the surface of a symmetric polyoxadiazole-co-hydrazide FO membrane. This unique structural design promoted an FO membrane (named PPy-PODH) with a high water flux (12.7 L m–2 h–1) and exceptional reverse flux selectivity (115,000 L mol–1), 3 orders of magnitude higher than those of commercial FO membranes. At an external voltage of 2 V, the conductive FO membrane could maintain a substantial operation (water flux maintained at approximately 6 L m–2 h–1), achieving a high concentration factor of 2.6 toward skim milk. Moreover, high flux recovery ratios of >94.3% were obtained for the PPy-PODH membrane in a “concentration-cleaning” loop experiment, in contrast to 55% for the commercial FO membrane. Overall, this study presents a promising strategy to achieve efficient mass concentration using conductive FO membranes coupled with an electro-FO system.
研究领域:
食品科学
·
膜技术
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 24
·4137-4144
·
IF 4.568
Yaxin Xu,Jiarui Hu,Xinyuan Du,Xinglin Xiao,Mingkai Li,Jiang Tang,Junnian Chen,Yunbin He
Graphical A novel hybrid bismuth bromide perovskite with centimeter size and high transparency was synthesized via antisolvent-assisted crystallization, exhibiting promising X-ray detection behavior. Hybrid bismuth halides perovskites have emerged as promising candidates for X-ray detection, due to the strong absorptivity of high-energy X-ray photons, high resistivity, large carrier diffusion length and low toxicity. However, the mostly investigated hybrid bismuth iodides single crystals are usually opaque and require a harsh synthesis process. Herein, novel one-dimensional (1D) pentamethylenediamine bismuth bromide (PDA)BiBr 5 single crystals were synthesized via an antisolvent-assisted crystallization method at room temperature. Bulk (PDA)BiBr 5 single crystals have sizes of 10×1.3×1.5 mm 3 and high transparency. They are shown to have low density of defects of 2.0×10 10 cm −3 and obvious photoconductivity. Moreover, they exhibit large bulk resistivity of 2.13×10 11 Ω cm and good X-ray attenuation coefficient. Consequently, the vertical structured (PDA)BiBr 5 single crystal X-ray photoconductor produces a sensitivity of 3.8 μC Gy air −1 cm −2 . This study provides a facile strategy for synthesizing bulk hybrid bismuth bromides single crystals with potential X-ray detection application.
研究领域:
材料科学
·
辐射探测技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74251-74255
·
IF 3.84
Juan-Ye Wang,Hong-Dan Peng,Jia-Mei Yang,Jing-Hui Yan,Ge-Bo Pan
We develop a facile approach for the one-step growth of ultralong and high-quality NiOEP nanowires in a large area, through a solvent-induced self-assembly method without using any structure directing agents. The size of the nanowires can be controlled by changing the composites of solvent mixtures. Being assembled in visible-light sensors, these nanowires exhibit a fast, reversible, and stable response. The highest Ion/Ioff ratio and photoresponsivity of photodiodes could reach 681 and 10.1 mA W−1, respectively, which could be attributed to the perfect single crystal quality, large surface to volume ratio, and fewer recombination barriers within the nanostructures. The facile fabrication and good photoresponse make NiOEP nanowires promising in optoelectronic applications.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
物理化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Hongyu Shi,Na Li,Zhixia Sun,Tianqi Wang,Lin Xu
TiO 2 nanoparticles are commonly used as versatile precursors to make functional nanocomposite materials. However, the surface defects at grain boundaries of TiO 2 nanoparticles significantly affect the photoelectric properties of TiO 2 nanomaterials . In this work, we firstly prepared nanocomposites of TiO 2 and polyoxometalates (POMs) in which different POMs, including titanium-substituted POMs K 5 [PW 11 TiO 40 ] and K 7 [PW 10 Ti 2 O 40 ], are incorporated with TiO 2 nanoparticles so as to make an interface modification on grain boundaries of TiO 2 nanoparticles. Then the photoconductivities of the TiO 2 /POM nanocomposites were investigated through measurement of photocurrent responses, current-voltage curves, Mott-Schottky plots and surface photocurrent spectra. Compared with pure TiO 2 nanoparticles, TiO 2 /POM nanocomposites exhibit superior photoelectric properties, benefitting from the interface modification from different POMs. The gas sensing performance for acetone was also explored by use of the as-prepared photoconductive devices, and TiO 2 /PW 11 Ti exhibited a high gas sensing performance.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
传感器技术
·
光电子学
✓ 已验证
DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 15
·5599
·
IF 3.252
Siyuan Chen,Fanghui Liu,Yang Zhou,Xiuping Lan,Shouzhen Li,Lulu Wang,Quan Xu,Yeqing Li,Yan Jin
Proppant is an essential material in hydraulic fracturing, and it can support artificial fractures for a long time. However, few people have applied proppant and conductive materials in the in-situ modification of shale oil. Here, we developed a graphene and resin coated (GRC) proppant with electrically conductive properties. The electrical conductivity of the GRC proppant improved by four orders of magnitude. The GRC proppant has a 54.58% improvement in suspension and 22.75% increase in settlement time at 0.25 wt% concentration compared with uncoated proppant. The GRC proppant’s adhesion reached 68.34 nN under 1 μN load force, increasing by 63.13% compared to uncoated proppant. This new electrically conductive proppant can be used as a conductive carrier to improve the efficiency of electric heating in in-situ modification technology of shale oil.Keywords:shale oil;proppants;electrical conductivity;in-situ modification
研究领域:
材料科学
·
石油工程
·
化学工程
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 44
·2303044
·
IF 13.3
Yuqi Xie,Zhaohui Li,Yawen Zhang,Yunjie Lu,Jianming Zhang,Lu Zong
Lightweight porous hydrogels provide a worldwide scope for functional soft mateirals. However, most porous hydrogels have weak mechanical strength, high density (>1 g cm −3 ), and high heat absorption due to weak interfacial interactions and high solvent fill rates, which severely limit their application in wearable soft-electronic devices. Herein, an effective hybrid hydrogel-aerogel strategy to assemble ultralight, heat-insulated, and tough polyvinyl alcohol (PVA)/SiO 2 @cellulose nanoclaws (CNCWs) hydrogels (PSCG) via strong interfacial interactions with hydrogen bonding and hydrophobic interaction is demonstrated. The resultant PSCG has an interesting hierarchical porous structure from bubble template (≈100 µm), PVA hydrogels networks introduced by ice crystals (≈10 µm), and hybrid SiO 2 aerogels (<50 nm), respectively. PSCG shows unprecedented low density (0.27 g cm −3 ), high tensile strength (1.6 MPa) & compressive strength (1.5 MPa), excellent heat-insulated ability, and strain-sensitive conductivity. This lightweight porous and tough hydrogel with an ingenious design provides a new way for wearable soft-electronic devices.
研究领域:
材料科学
·
软电子学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Biological Engineering
·
2023
·Vol. 17
·期 1
·1-20
·
IF 5.6
Liu Tiemei,Zhang Qiang,Li Hongru,Cui Xiaoqian,Qi Zhiping,Yang Xiaoyu
Background Spinal cord injury (SCI) is a serious injury with high mortality and disability rates, and there is no effective treatment at present. It has been reported that some treatments, such as drug intervention and stem cell transplantation have positive effects in promoting neurological recovery. Although those treatments are effective for nerve regeneration, many drawbacks, such as low stem cell survival rates and side effects caused by systemic medication, have limited their development. In recent years, injectable hydrogel materials have been widely used in tissue engineering due to their good biocompatibility, biodegradability, controllable properties, and low invasiveness. The treatment strategy of injectable hydrogels combined with stem cells or drugs has made some progress in SCI repair, showing the potential to overcome the drawbacks of traditional drugs and stem cell therapy.
Methods In this study, a novel injectable electroactive hydrogel (NGP) based on sodium hyaluronate oxide (SAO) and polyaniline-grafted gelatine (NH2-Gel-PANI) was developed as a material in which to load neural stem cells (NSCs) and donepezil (DPL) to facilitate nerve regeneration after SCI. To evaluate the potential of the prepared NGP hydrogel in SCI repair applications, the surface morphology, self-repairing properties, electrical conductivity and cytocompatibility of the resulting hydrogel were analysed. Meanwhile, we evaluated the neural repair ability of NGP hydrogels loaded with DPL and NSCs using a rat model of spinal cord injury.
Results The NGP hydrogel has a suitable pore size, good biocompatibility, excellent conductivity, and injectable and self-repairing properties, and its degradation rate matches the repair cycle of spinal cord injury. In addition, DPL could be released continuously and slowly from the NGP hydrogel; thus, the NGP hydrogel could serve as an excellent carrier for drugs and cells. The results of in vitro cell experiments showed that the NGP hydrogel had good cytocompatibility and could significantly promote the neuronal differentiation and axon growth of NSCs, and loading the hydrogel with DPL could significantly enhance this effect. More importantly, the NGP hydrogel loaded with DPL showed a significant inhibitory effect on astrocytic differentiation of NSCs in vitro. Animal experiments showed that the combination of NGP hydrogel, DPL, and NSCs had the best therapeutic effect on the recovery of motor function and nerve conduction function in rats. NGP hydrogel loaded with NSCs and DPL not only significantly increased the myelin sheath area, number of new neurons and axon area but also minimized the area of the cystic cavity and glial scar and promoted neural circuit reconstruction.Conclusion sThe DPL- and NSC-laden electroactive hydrogel developed in this study is an ideal biomaterial for the treatment of traumatic spinal cord injury.
研究领域:
生物医学工程
·
神经科学
·
组织工程
·
药学
·
干细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）