Abstract
Death from acute hemorrhage is a major problem in military conflicts, traffic accidents, and surgical procedures, et al. Achieving rapid effective hemostasis for pre-hospital care is ...essential to save lives in massive bleeding. An ideal hemostasis material should have those features such as safe, efficient, convenient, economical, which remains challenging and most of them cannot be achieved at the same time. In this work, we report a rapid effective nanoclay-based hemostatic membranes with nanoclay particles incorporate into polyvinylpyrrolidone (PVP) electrospun fibers. The nanoclay electrospun membrane (NEM) with 60 wt% kaolinite (KEM1.5) shows better and faster hemostatic performance in vitro and in vivo with good biocompatibility compared with most other NEMs and clay-based hemostats, benefiting from its enriched hemostatic functional sites, robust fluffy framework, and hydrophilic surface. The robust hemostatic bandages based on nanoclay electrospun membrane is an effective candidate hemostat in practical application.
CaTiO
3
nanocuboids (width 0.3–0.5
μ
m, length 0.8–1.1
μ
m) have been synthesized by a hydrothermal route using commercial P25 as the titanium source. The as-prepared sample was systematically ...characterized by means of x-ray powder diffraction, field-emission scanning electron microscopy, field-emission transmission electron microscopy, x-ray photoelectron spectroscopy, Brunauer–Emmett–Teller, ultraviolet–visible diffuse reflectance spectroscopy and electrochemical impedance spectroscopy. The photocatalytic activity of the sample was evaluated by degrading rhodamine B under simulated sunlight irradiation. It is demonstrated that CaTiO
3
nanocuboids exhibit superior photocatalytic activity when compared with CaTiO
3
nanoparticles. By investigating the effect of scavengers on the dye degradation and the yield of hydroxyl (·OH) radicals, it is concluded that ·OH is the dominant reactive species.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The single-walled carbon nanotubes (SWNTs) filled nanocomposite SWNT/epoxy resin composite with good uniformity, dispersion and alignment of SWNTs and with different SWNTs concentrations was produced ...by solution casting technique. Subsequently, the semidried mixture was stretched repeatedly along one direction at a large draw-ratio of 50 for 100 times at ambient atmosphere manually to achieve a good alignment and to promote dispersion of SWNTs in the composite matrix. Composite showed higher electrical conductivities and mechanical properties such as the Young’s modulus and tensile strength along the stretched direction than perpendicular to it, and the electrical property of composite rise with the increase of SWNT concentration. The percolation threshold value of electrical conductivity along the stretching direction is lower than the value perpendicular to the SWNTs orientation. In addition, the anisotropic electric and mechanical properties results, SEM micrograph and the polarized Raman spectra of the SWNT/epoxy composite reveal that SWNTs were well dispersed and aligned in the composites by the repeated stretching process.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
In the past 10 years, the treatment and restoration of soil and water bodies contaminated by mercury and other heavy metals have received unprecedented attention and support from China’s ...environmental protection authorities. The search for low-cost and high-efficiency adsorbents has become one of the research hotspots in this field. In this paper, a simple and environment-friendly method was used to graft 3-mercaptopropyl trimethoxysilane on the surface of palygorskite. The synthesized mercaptofunctionalized palygorskite (M-PAL) was characterized by XRD, FT-IR, BET and SEM-EDS, respectively, and its adsorption conditions, adsorption models and thermodynamic parameters for Hg
2+
were systematically investigated. The experimental results indicated that the saturated adsorption capacity of Hg
2+
on the M-PAL could reach 203.4 mg·g
−1
, within 120 min at pH 4 and 298 K. By analyzing the experimental data of adsorption kinetics and thermodynamics, it was found that the adsorption process of Hg
2+
conformed to the pseudo-second-order kinetic model, which belonged to chemical adsorption of the rate-controlled step; the Langmuir model better described the adsorption isotherm. The thermodynamic parameters obtained (Δ
H
=29.95 kJ·mol
−1
, Δ
S
=103.09 J·mol
−1
·K
−1
and Δ
G
<0) show that the whole process is a spontaneous endothermic process. When the concentration of Na
+
, K
+
, Ca
2+
, Mg
2+
, Cl
−
, NO
3
−
, H
2
C
2
O
4
and C
6
H
8
O
7
was 200 times that of Hg
2+
, although these organic acids had a slightly greater effect on the adsorption of Hg
2+
on mercaptofunctionalized palygorskite than inorganic ions, the adsorption capacity remained above 185 mg·g
−1
. The adsorption products could be still stable in simulated acid rain with pH 3, 4, 5, 6, 7 and oxalic acid solution with concentration of 1, 2, 3, 4 and 5 mmol·L
−1
, and the desorption rates were about 3%. Through XPS analysis, the specific coordination of Hg
2+
with the S atom on the surface of M-PAL was confirmed.
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CEKLJ, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
In this article the diamond-like carbon films have been prepared by the strategy of the glancing angle deposition using unbalanced magnetron sputtering technique. It is found that the structure and ...the residual stress of the films are strongly dependent on the deposition angle. Of particular interest is that the stress of the films significantly transforms from compressive to tensile state as a function of the deposition angle, which is attributed to the result of the competition and mediation between compressive stress due to surface capillary forces of the island surface and tensile stress due to the coalescence of the islands during Volmer-Weber growth of the films. Based on this mechanism, the nearly stress-free film with desirable performance can be prepared at the proper deposition angle. The correlation between the residual stress and the atomic-bond structure also reveals that the stress transition is not only related to the sp2-bonded carbon content, but also closely to the changes of the heptatomic and pentatonic rings in the carbon network. This work demonstrated herein will provide a promising route to prepare the stress-free diamond-like carbon films with desirable performance.
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•The DLC films have been prepared using the strategy of glancing angle deposition.•The film stress transforms from compressive to tensile state with deposition angle.•The nearly stress-free DLC film can be obtained within the stress transition region.•The mechanism of stress transition is explained in view of growth process of films.•The results reveal the correlation between the stress and atomic-bond of the films.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
High-performance mixed matrix membranes (MMMs) were developed to assist in controlling global warming by capturing carbon dioxide (CO
2
) from moist flue gas. However, the separation performance of ...MMMs has always been limited by gas permeability and long-term operating stability under humid conditions. ZIF-302 is a novel chabazite (CHA) topology structure with hydrophobic ligand. Herein, uniform ZIF-302 nanocrystals were doped into the P84 polymer matrix to synthesize different content of defect-free ZIF-302/P84 MMMs for CO
2
/N
2
separation. A significant combination of gas permeability and separation factors was found in MMMs with a ZIF-302 packing load of 30 wt%. The gas permeability of CO
2
and the separation factor of CO
2
/N
2
were significantly increased to 5.2 Barrers and 46, respectively, which breaks the trade-off between permeability and selectivity of the polymer membrane. In addition, the long-term operation stability showed that the separation performance of ZIF-302/P84 MMMs for CO
2
/N
2
was maintained more than 30 h at 3 bar and 60 °C. The main characteristics of the MMMs prepared in this paper include the combination of favorable structural stability under humid conditions and unaffected CO
2
/N
2
gas separation performance.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Tin dioxide (SnO2) has attracted extensive research attention as promising anode materials for lithium ion batteries due to high theoretical capacity. However, its application is largely hindered by ...poor electronic conductivity and drastic volume change during the conversion reaction and alloying processes. Herein, we report a three-dimensional nitrogen-doped graphene aerogel decorating ultra-small SnO2 nanoparticles (3–6 nm) by a facile one-step hydrothermal process. Nanoscaled SnO2 nanoparticles facilitate limited volume expansion and shortened lithium diffusion pathways, nitrogen-doping increases the positive charge density of carbon atoms adjacent to the nitrogen atom, while the three-dimensional porous graphene aerogel has excellent electronic conductivity and facile electrolyte infiltration, thus prompting the composite electrode excellent electrochemical performance. When used as bind-free anode electrode, the graphene aerogel/SnO2 composite delivers a high discharge capacity of 1812.0 mAh g−1 in the initial cycle, and the capacity can retain at 778 mAh g−1 after 100 cycles, demonstrating its promising candidate as anode material for energy storage.
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•3D N-doped GA decorating ultra-small SnO2 is prepared by hydrothermal reaction.•Ultra-small SnO2 nanocrystals exhibit high activity and limited volume expansion.•N-doping increases positive charge density of C atoms and electronic conductivity.•3D porous GA has facile electrolyte infiltration and excellent structure stability.•The composite can be used as electrode directly and shows excellent cyclability.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
In this paper, the MnO2/three-dimensional carbon nanotubes-graphene nanocomposite was synthesized on Cu foil substrate by chemical vapor deposition and subsequent thermal decomposition of manganese ...acetyllacetonate precursors. The nanocomposite material was directly used as a binder-free electrode to investigate the supercapacitive performance. The results indicate that the appropriate defects and MnO2 nanoparticles are introduced simultaneously into the carbon nanotubes-graphene architecture in one-step. The specific capacitance of MnO2/three-dimensional carbon nanotubes-graphene/Cu electrode is up to 365 F g−1 at a current density of 1 A g−1 in 1.0 M Na2SO4 solution, which is 9 times higher than that of electrode without MnO2 modification. After 1000 cycles at 1 A g−1, the capacity retention is still maintained at 97.0%, suggesting potential applications in high-performance energy storage devices. The excellent electrochemical performances of nanocomposite electrode can be attributed to the significantly synergistic effects between the lasting electronic conductivity of three-dimensional carbon nanotubes-graphene/Cu with the appropriate defects and the pseudocapacitance of the MnO2 nanoparticles.
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•MnO2/3D CNTs-G/Cu was fabricated as a binder-free electrode using a facile method.•Defects and α-MnO2 was introduced simultaneously into the 3D CNTs-G/Cu in one-step.•The specific capacitance of MnO2/3D CNTs-G/Cu reached 365 F g−1 at 1 A g−1 current.•Synergistic effects of 3D CNTs-G/Cu lasting conductivity and MnO2 pseudocapacitance.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
The lives and safety of humans are significantly threatened by acute myeloid leukemia (AML), which is proven to be the most prevalent acute leukemia. This work is therefore intended to investigate ...and analyze the expressions of miR-361-3p and Histone Lysine Methyltransferase 2A (KMT2A) in tissues and cell lines of AML and identify an advanced and novel target for the therapy of AML.
The qRT-PCR and western blot assays were conducted to find expressions of miR-361-3p/KMT2A in AML PB and cell lines. After then, tests using CCK-8 and EdU were run to see how KMT2A affected the growth of AML cells. Transwell migration and invasion assay was conducted to evaluate KMT2A's contribution to the migration and invasion of AML cells. ENCORI and miRWalk predicted the association between KMT2A and miR-361-3p, and the dual-luciferase reporter experiment verified it. Furthermore, rescue studies were used to ascertain how KMT2A affected the miR-361-3p-regulated AML cells' abilities to proliferate, migrate, and invade.
miR-361-3p was poorly expressed while KMT2A was abundantly expressed. Additionally, KMT2A downregulation prevented AML cells from proliferating. PCNA and Ki-67 protein levels fell when KMT2A was silent. Furthermore, AML cells' motility, invasion, and metastasis were inhibited by low KMT2A expression. KMT2A was also identified as a direct target of miR-361-3p and negatively correlated with miR-361-3p. Finally, the over-expression of KMT2A partially reversed the inhibitory effects of up-regulation of miR-361-3p.
A potential therapeutic candidate target for the treatment of AML may be miR-361-3p/KMT2A.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Porous materials have promise as sound insulation, heat barrier, vibration attenuation, and catalysts. Most industrial solid wastes, such as tailings, coal gangue, and fly ash are rich in silicon. ...Additionally, a high silicon content waste is a potential raw material for the synthesis of silicon-based, multi-porous materials such as zeolites, mesoporous silica, glass—ceramics, and geopolymer foams. Representative silicon-rich industrial solid wastes (SRISWs) are the focus of this mini review of the processing and application of porous silicon materials with respect to the physical and chemical properties of the SRISW. The transformation methods of preparing porous materials from SRISWs are summarized, and their research status in micro-, meso-, and macro-scale porous materials are described. Possible problems in the application of SRISWs and in the preparation of functional porous materials are analyzed, and their development prospects are discussed. This review should provide a typical reference for the recycling and use of industrial solid wastes to develop sustainable “green materials.”
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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