- One-pot route to synthesize HNTs@PVDF membrane for rapid and effective separation of emulsion-oil and dyes from waste water. [Journal Article]
- JHJ Hazard Mater 2019 Jul 10; 380:120865
- Water-purification membranes with high water flux, excellent recycling ability, good anti-fouling property, wide range for different oil/water emulsions separation, and strong water-soluble dyes remo…
Water-purification membranes with high water flux, excellent recycling ability, good anti-fouling property, wide range for different oil/water emulsions separation, and strong water-soluble dyes removal ability are highly desirable for water purification but still a challenge to be realized. In this work, we show a simple method to address this challenge, in which halloysite nanotubes (HNTs) have been decorated on the poly (vinylidene fluoride) (PVDF) membrane surface through one-pot method via the aid of KH550 and dopamine. The HNTs@PVDF composite membrane exhibits superhydrophilic and under-water superoleophobic performance. In addition, our membrane can separate wide oil/water emulsions (including surfactant-stabilized and surfactant-free emulsions) from wastewater with high efficiency (>99.65%), outstanding recycle ability with good flux recovery rate (FRR > 95%) and good anti-fouling performance (the underwater oil contact angle (OCA) is 155.8 ± 1.8° with low oil adhesion) and high water flux (7994 ± 150 L m-2 h-1). Interestingly, our membrane also removes different water-soluble dyes (e.g., Congo red, methylene blue, and rhodamine B) from waste water by simply filtering. Those outstanding properties make our membrane hold great potential applications in real-world water purification and environmental protection.
- Anatomical analyses for maxillary sinus floor augmentation with a lateral approach. A cone beam computed tomography study. [Journal Article]
- AAAnn Anat 2019 Jul 19
- CONCLUSIONS: In conclusion, the analysis of the CBCT before sinus floor elevation allows the identification of anatomical structures and references that might be used for the planning of the surgical approach, aiming to improve the outcome of the treatment and to avoid possible complications.
- Farnesylation of human guanylate binding protein 1 as safety mechanism preventing structural rearrangements and uninduced dimerization. [Journal Article]
- FJFEBS J 2019 Jul 22
- Human guanylate binding protein 1 (hGBP1) belongs to the family of dynamin-like proteins and is activated by addition of nucleotides, leading to protein oligomerization and stimulated GTPase activity…
Human guanylate binding protein 1 (hGBP1) belongs to the family of dynamin-like proteins and is activated by addition of nucleotides, leading to protein oligomerization and stimulated GTPase activity. In vivo, hGBP1 is posttranslationally modified by attachment of a farnesyl-group yielding farn-hGBP1. In this study, hydrodynamic differences of farn-hGBP1 and unmodified hGBP1 were investigated using dynamic light scattering (DLS), analytical ultracentrifugation (AUC) and analytical size exclusion chromatography (SEC). In addition, we performed small-angle X-ray scattering (SAXS) experiments coupled with a SEC setup (SEC-SAXS) to investigate structural properties of non-modified hGBP1 and farn-hGBP1 in solution. SEC-SAXS measurements revealed that farnesylation keeps hGBP1 in its inactive monomeric and crystal-like conformation in nucleotide-free solution, whereas unmodified hGBP1 forms a monomer-dimer equilibrium both in the inactive ground state in nucleotide-free solution as well as in the activated state that is trapped by addition of the non-hydrolysable GTP analogue GppNHp. Non-modified hGBP1 is structurally perturbed as compared to farn-hGBP. In particular, GppNHp binding leads to large structural rearrangements and higher conformational flexibility of the monomer and the dimer. Structural changes observed in the non-modified protein are prerequisites for further oligomer assemblies of farn-hGBP1 that occur in the presence of nucleotides. This article is protected by copyright. All rights reserved.
- Posterior Petrosal Transotic Approach for Cerebellopontine Angle Hemangioblastoma: Technical Case Report. [Journal Article]
- ONOper Neurosurg (Hagerstown) 2019 Apr 24
- CONCLUSIONS: The posterior petrosal transotic approach offers an improved surgical working angle to the anterior brainstem compared to the translabyrinthine approach. This advantage can be particularly important with vascular tumors that receive blood supply anteriorly, as in this case from AICA, and can improve the safety of the resection.
- Designable spectrometer-free index sensing using plasmonic Doppler gratings. [Journal Article]
- ACAnal Chem 2019 Jul 22
- Typical nanoparticle-based plasmonic index sensors detect the spectral shift of localized surface plasmon resonance (LSPR) upon the change of environmental index. Therefore, they require broadband il…
Typical nanoparticle-based plasmonic index sensors detect the spectral shift of localized surface plasmon resonance (LSPR) upon the change of environmental index. Therefore, they require broadband illumination and spectrometers. The sensitivity and flexibility of nanoparticle-based index sensors are usually limited because LSPR peaks are usually broad and the spectral position cannot be freely designed. Here, we present a fully designable index sensing platform using a plasmonic Doppler grating (PDG), which provides broadband and azimuthal angle dependent grating perio-dicities. Different from LSPR, the PDG index sensor is based on the momentum matching between photons and surface plasmons via the lattice momentum of the grating. Therefore, index change is translated into the variation of in-plane azimuthal angle for photon-to-plasmon coupling, which manifests as directly observable dark bands in the reflection image. The PDG can be freely designed to optimally match the range of index variation for specific applications. In this work, we demonstrate PDG index sensors for large (n = 1.00~1.52) and small index variation (n = 1.3330~1.3650). The tiny and nonlinear index change of water-ethanol mixture has been clearly observed and accurately quantified. Since the PDG is a dispersive device, it enables on-site and single-color index sensing without a spectrometer and provides a promising spectroscopic platform for on-chip analytical applications.
- SNR optimized 31 P functional MRS to detect mitochondrial and extracellular pH change during visual stimulation. [Journal Article]
- NBNMR Biomed 2019 Jul 22; :e4137
- CONCLUSIONS: Overall, the downfield peak of Pi could be observed, revealing opportunities and considerations to measure specific acidity (pH) effects in the human visual cortex.
- Bio-Inspired Shape-Adaptive Soft Robotic Grippers Augmented with Electroadhesion Functionality. [Journal Article]
- SRSoft Robot 2019 Jul 18
- Soft robotic grippers (SRGs) have been extensively employed in robotic grasping and manipulation applications due to the fact that they are beneficial for pick-and-place of difficult-to-handle and de…
Soft robotic grippers (SRGs) have been extensively employed in robotic grasping and manipulation applications due to the fact that they are beneficial for pick-and-place of difficult-to-handle and delicate objects with various geometries and stiffness in a comfortable and safer way. This article presents a bio-inspired and shape-adaptive SRG augmented with electroadhesion (EA) functionality, FinEA, by a cost-effective combination of a Fin Ray structured two-fingered SRG with two soft-stretchable EA pads. The EA pads were manufactured by screen printing a layer of electrically conductive and elastomeric carbon black powder mixed with polydimethylsiloxane onto a dielectric substrate. The compliant Fin Ray fingers, composed of soft longitudinal beams and rigid cross beams, were structurally optimized by the finite element method using ABAQUS/CAE based on three key parameters: the open angle of the longitudinal beams, the spacing between the cross beams, and the incline angle of the cross beams. The soft beams were produced by a traditional soft lithography method, whereas the rigid cross beams were three-dimensionally printed. The resultant FinEA grippers were capable of lifting not only flat/thin materials without distorting them due to the employment of EA, but also concave and convex objects due to the passively shape-adaptive Fin Ray structure and the EA functionality. In addition, the proposed FinEA grippers were able to grasp delicate materials and objects whose diameters are larger than the overall gripper length. Furthermore, 65% more weight in shear were picked up by the FinEA gripper when 4 kV was applied compared with 0 V. The FinEA concept provides useful and alternative solution for controllable adhesion-based SRGs and may facilitate the inspiration and development of future SRGs with added functionality and enhanced versatility.
- Stable Dropwise Condensation of Ethanol and Hexane on Rationally-Designed Ultra-Scalable Nanostructured Lubricant-Infused Surfaces. [Journal Article]
- NLNano Lett 2019 Jul 22
- Vapor condensation is a widely used industrial process for transferring heat and separating fluids. Despite progress in developing low surface energy hydrophobic and micro/nanostructured superhydroph…
Vapor condensation is a widely used industrial process for transferring heat and separating fluids. Despite progress in developing low surface energy hydrophobic and micro/nanostructured superhydrophobic coatings to enhance water vapor condensation, demonstration of stable dropwise condensation of low-surface-tension fluids has not been achieved. Here, we develop rationally designed nanoengineered lubricant-infused surfaces (LIS) having ultralow contact angle hysteresis (<3º) for stable dropwise condensation of ethanol (γ ≈ 20 mN/m) and hexane (γ ≈ 18 mN/m). Using a combination of optical imaging and rigorous heat transfer measurements in a controlled environmental chamber free from non-condensable gases (< 4 Pa), we characterize the condensation behavior of ethanol and hexane on ultra-scalable nanostructured CuO surfaces impregnated with fluorinated lubricants having varying viscosities (0.496 < µ < 5.216 Pa·s) and chemical structures (branched vs. linear, Krytox and Fomblin). We demonstrate stable dropwise condensation of ethanol and hexane on LISs impregnated with Krytox 1525, attaining about 200% enhancement in condensation heat transfer coefficient for both fluids compared to filmwise condensation on hydrophobic surfaces. In contrast to previous studies, we use 7 hours of steady dropwise condensation experiments to demonstrate the importance of rational lubricant selection to minimize lubricant drainage, and maximize LIS durability. This work not only demonstrates an avenue to achieving stable dropwise condensation of ethanol and hexane, it develops the fundamental design principles for creating durable LISs for enhanced condensation heat transfer of low-surface-tension fluids.
- Second-Generation of Multiple-Angle Incidence Resolution Spectrometry. [Journal Article]
- JPJ Phys Chem A 2019 Jul 22
- Infrared (IR) surface spectroscopic techniques commonly have long-term issues that 1) the multiple reflections of light in the substrate yield optical interference fringes in the absorption spectrum,…
Infrared (IR) surface spectroscopic techniques commonly have long-term issues that 1) the multiple reflections of light in the substrate yield optical interference fringes in the absorption spectrum, and 2) the double-modulation of light at the interferometer in FT-IR makes a water-vapor-subtraction impossible. These measurement troubles often disturb the quantitative analysis of chemical bands of the analyte thin film. Multiple-angle incidence resolution spectrometry (MAIRS) is not an exception on this matter, either. In the present study, the long-term common issues have first been resolved by fixing the angle of incidence at a large angle; whereas the polarization angle is changed. With this simple conceptual change of MAIRS, as a result, we are ready for concentrating on spectral analysis only without concerning about the measurement troubles.
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- Sandwich-Like Nanofibrous Scaffolds for Bone Tissue Regeneration. [Journal Article]
- AAACS Appl Mater Interfaces 2019 Jul 22
- Advanced bone healing approaches included a wide range of biomaterials that mainly mimic the composition, structure and properties of bone extracellular matrix with osteogenic activity. The present s…
Advanced bone healing approaches included a wide range of biomaterials that mainly mimic the composition, structure and properties of bone extracellular matrix with osteogenic activity. The present study aimed to develop a sandwich-like structure of electrospun nanofibers (NFs) based on polycaprolactone (PCL) and chitosan/ polyethylene oxide (CS/PEO) composite to stimulate bone fracture healing. The morphology of the fabricated scaffolds was examined using SEM. Apatite deposition was evaluated using simulated body fluid (SBF). Physicochemical and mechanical properties of samples were analyzed by FTIR, DSC, TGA and universal testing machine. SEM micrographs exhibited a porous 3D structure with NFs diameters of 307.2-900 nm and 20.5-380.4 nm for PCL NFs layer and the sandwich-like NFs scaffolds, respectively. Deposition of apatite crystal on scaffolds started at week 2 followed by heavy deposition at week 8. This was confirmed by measuring the consumption of calcium and phosphorous ions from SBF. Thermal stability of scaffolds was confirmed using DSC and TGA. Moreover, the PCL NFs layer in the middle of the developed sandwich-structure reinforced the scaffolds with bear load until 12.224 ± 1.12MPa and young's modulus of 3.97 MPa. The scaffolds porous structure enhanced both cells propagation and proliferation. Besides, presence of CS in the outer NFs layers of the scaffolds increased the hydrophilicity as evidenced by reduction of contact angle from 116.6° to 57.6° which is essential for cell attachment. Cell viability study on mesenchymal stem cells proved the cytocompatibility of the fabricated scaffolds. Finally, in-vivo mandibular bone defect rabbit model was used to confirm the regeneration of a new healthy bone within 28 days. In conclusion, the developed scaffolds could be a promising solution to stimulate bone regeneration.