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https://www.readbyqxmd.com/read/29160771/synthesis-of-oxide-free-aluminum-nanoparticles-for-application-to-conductive-film
#1
Yung Jong Lee, Changsoo Lee, Hyuck Mo Lee
Aluminum nanoparticles are considered promising as alternatives to conventional ink materials, replacing silver and copper nanoparticles due to their extremely low cost and low melting temperature. However, a serious obstacle to realizing their use as conductive ink materials is the oxidation of aluminum. In this research, we synthesized the oxide-free aluminum nanoparticles using catalytic decomposition and an oleic acid coating method, and these materials were applied to the conductive ink for the first time...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29158128/fullerene-pamam-g5-composite-modified-impedimetric-biosensor-to-detect-fetuin-a-in-real-blood-samples
#2
Zihni Onur Uygun, Çağdaş Şahin, Merve Yilmaz, Yasemin Akçay, Ali Akdemir, Ferhan Sağin
The aim of this study is to develop a nanomaterial-dendrimer composite modified biosensor to detect Fetuin-A (HFA) in real blood samples. For this purpose, we designed an Electrochemical Impedance Spectroscopy (EIS) based anti-Fetuin-A (Anti-HFA) modified biosensor system and tested in real blood samples. Chronoimpedance was also employed. The same samples were analyzed with ELISA and the results were compared for validation of the new system. Gold screen printed electrodes (AuSPE) were used as transducer. Firstly, a self-assembly monolayer (SAM) was formed on gold surface by 4-aminothiophenol (4-ATP), Fullerene and PAMAM-NH2 (G5), layers were formed, consecutively...
November 17, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/29157512/the-closing-of-forensic-psychiatric-hospitals-in-italy-determinants-current-status-and-future-perspectives-a-scoping-review
#3
REVIEW
Claudio Di Lorito, Luca Castelletti, Ilaria Lega, Barbara Gualco, Franco Scarpa, Birgit Vӧllm
INTRODUCTION: Italy is the only country in the world to have closed forensic psychiatric hospitals and converted to fully-residential services. The international interest around this reform has not been matched by research. This scoping review aims to report the determinants of the reform, the most updated information on how the system operates, its benefits and its challenges. We further aim to discuss the implications for policy, research and practice. METHODS: 1...
November 2017: International Journal of Law and Psychiatry
https://www.readbyqxmd.com/read/29155411/porosity-effect-of-3d-printed-polycaprolactone-membranes-on-calvarial-defect-model-for-guided-bone-regeneration
#4
Jin-Hyung Shim, Jae-Hyang Jeong, Joo-Yun Won, Ji-Hyeon Bae, Geunseon Ahn, Hojun Jeon, Won-Soo Yun, Eun-Bin Bae, Jae-Won Choi, So-Hyoun Lee, Chang-Mo Jeong, Hoyun Chung, Jung-Bo Huh
The appropriate porosity and pore size of barrier membrane were associated with the transportation of biomolecules required for new bone formation and angiogenesis. In this study, we fabricated 3D-printed resorbable polycaprolactone (PCL) membranes with different porosities (30%, 50%, and 70%) to evaluate the effective pore size for guided bone regeneration (GBR) membranes. To analyze mechanical properties and cytocompatibility, PCL membranes prepared using extrusion-based 3D printing technology were compared in dry and wet conditions and tested in vitro...
November 20, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29152973/epidermal-microfluidic-electrochemical-detection-system-enhanced-sweat-sampling-and-metabolite-detection
#5
Aida Martin, Jayoung Kim, Jonas F Kurniawan, Juliane R Sempionatto, Jose R Moreto, Guangda Tang, Alan C Campbell, Andrew Shin, Min Yul Lee, Xiaofeng Liu, Joseph Wang
Despite tremendous recent efforts, non-invasive sweat monitoring is still far from delivering its early analytical promise. Here, we describe a flexible epidermal microfluidic detection platform fabricated through hybridization of lithographic and screen-printed technologies for efficient sweat sampling and continuous real-time electrochemical monitoring of sweat glucose and lactate levels. This soft, skin-mounted device judiciously merges lab-on-a-chip and electrochemical detection technologies, integrated with a miniaturized flexible electronic board for real-time wireless data transmission to a smart device...
November 20, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29141112/multiscale-geometric-design-principles-applied-to-3d-printed-schwarzites
#6
Seyed Mohammad Sajadi, Peter Samora Owuor, Steven Schara, Cristiano F Woellner, Varlei Rodrigues, Robert Vajtai, Jun Lou, Douglas S Galvão, Chandra Sekhar Tiwary, Pulickel M Ajayan
Schwartzites are 3D porous solids with periodic minimal surfaces having negative Gaussian curvatures and can possess unusual mechanical and electronic properties. The mechanical behavior of primitive and gyroid schwartzite structures across different length scales is investigated after these geometries are 3D printed at centimeter length scales based on molecular models. Molecular dynamics and finite elements simulations are used to gain further understanding on responses of these complex solids under compressive loads and kinetic impact experiments...
November 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29140682/molecular-patterning-and-directed-self-assembly-of-gold-nanoparticles-on-gaas
#7
Tianhan Liu, Timothy D Keiper, Xiaolei Wang, Guang Yang, Daniel T Hallinan, Jianhua Zhao, Peng Xiong
The ability to create micro/nano patterns of organic self-assembled monolayers (SAMs) on semiconductor surfaces is crucial for fundamental studies and applications in a number of emerging fields in nanoscience. Here, we demonstrate the direct patterning of thiolate SAMs on oxide-free GaAs surface by dip-pen nanolithography (DPN) and micro-contact printing (μCP), facilitated by a process of surface etching and passivation of the GaAs. A quantitative analysis on the molecular diffusion on GaAs was conducted by examining the writing of nanoscale dot and line patterns by DPN, which agrees well with surface diffusion models...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29137703/fabrication-of-a-novel-aptasensor-based-on-three-dimensional-reduced-graphene-oxide-polyaniline-gold-nanoparticle-composite-as-a-novel-platform-for-high-sensitive-and-specific-cocaine-detection
#8
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Yalda Hosseinzadeh Ardakani, Tayyebeh Madrakian
In the present research, we have developed a novel label free aptasensor based on screen printed carbon electrode (SPCE) modified with three-dimensional magnetic reduced graphene oxide(3D-MRGO)/polyaniline(PA)/gold nanoparticle(AuNP) nanocomposite for impedimetric determination of cocaine. To achieve this goal, a specific thiolated cocaine aptamer was immobilized onto the surface of synthesized nanocomposite. The signaling mechanism of the proposed aptasensor was based on increase in the [Fe(CN)6](3-/4-) charge transfer resistance (RCT) as an electrochemical probe in the presence of target analyte...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29136932/cell-immobilization-on-3d-printed-matrices-a-model-study-on-propionic-acid-fermentation
#9
Fabricio Dos Santos Belgrano, Olaf Diegel, Nei Pereira, Rajni Hatti-Kaul
This study uses three-dimensional (3D) printing technology as a tool for designing carriers for immobilization of microbial cells for bioprocesses. Production of propionic acid from glucose by immobilized Propionibacterium sp. cells was studied as a model system. For cell adsorption, the 3D-printed nylon beads were added to the culture medium during 3 rounds of cell cultivation. Cell adsorption and fermentation kinetics were similar irrespective of the bead size and lattice structure. The cells bound to 15 mm beads exhibited reduced fermentation time as compared to free cell fermentations; maximum productivity and propionic acid titer of 0...
November 2, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29136807/in-situ-gold-nanoparticle-electrogeneration-on-gold-films-deposited-on-paper-for-non-enzymatic-electrochemical-determination-of-glucose
#10
Estefanía Núnez-Bajo, M Carmen Blanco-López, Agustín Costa-García, M Teresa Fernández-Abedul
This work describes the development and evaluation of a new electrochemical platform based on the sustainable generation of gold-nanoparticles on paper-based gold-sputtered electrodes. The disposable porous paper electrode is combined with screen-printed electrodes for ensuring a precise electrogeneration of nanoparticles and also for the evaluation of these simple, versatile and low-cost microfluidic devices. Two types of chromatographic paper with different thicknesses have been evaluated. Paper gold working electrodes modified with gold nanoparticles were characterized by scanning electron microscopy and cyclic voltammetry using potassium ferrocyanide as a common redox probe, showing an improved electrochemical performance when compared to bare gold electrodes...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29135459/tailoring-two-dimensional-nanoparticle-arrays-into-various-patterns
#11
Jinling Sun, Ying Wang, Jianhui Liao
A simple and effective technique has been developed to fabricate patterns of nanoparticle arrays. Lithographically fabricated structures in resists serve as scissors to tailor two-dimensional (2D) nanoparticle arrays on a flat poly(dimethylsiloxane) (PDMS) stamp. The desired patterns of nanoparticle arrays remaining on the PDMS stamp after tailoring can be printed onto solid substrates. Various regular nanoparticle patterns, such as squares, triangles, disks, and pentagons, can be easily prepared using this technique...
November 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29135262/a-low-molecular-weight-gelator-composed-of-pyrene-and-fluorene-moieties-for-effective-charge-transfer-in-supramolecular-ambidextrous-gel
#12
Samala Murali Mohan Reddy, Pramod Dorishetty, George Augustine, Abhijit P Deshpande, Niraikulam Ayyadurai, Ganesh Shanmugam
Charge-transfer (CT) gel materials obtained from low-molecular-weight (LMW) compounds through a supramolecular self-assembly approach have received fascinating attention by many researchers because of their interesting material property and potential applications. However, most of the CT gel materials constructed were of organogels while the construction of CT gels in the form of a hydrogel is a challenge because of the solubility issue in water, which considerably limits the use of CT hydrogels. Herein, for the first time, we report a new LMW gelator [N(α)-(fluorenylmethoxycarbonyl)-N(ε)-(δ-butyric-1-pyrenyl)-l-lysine, (FmKPy)], composed of two functional moieties such as fluorenylmethoxycarbonyl and pyrene, which not only parade both hydro and organo (ambidextrous) supramolecular gel formation but also exhibit CT ambidextrous gels when mixed with an electron acceptor such as 2,4,7-trinitro-9-fluorenone (TNF)...
November 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29134773/design-and-biological-functionality-of-a-novel-hybrid-ti-6al-4v-hydrogel-system-for-reconstruction-of-bone-defects
#13
Alok Kumar, K C Nune, R D K Misra
We have designed a unique injectable bioactive hydrogel comprising of alginate, gelatin, and nanocrystalline hydroxyapatite and loaded with osteoblasts, with the ability to infiltrate into three-dimensional Ti-6Al-4V scaffolds with interconnected porous architecture, fabricated by electron beam melting (EBM). A two-step crosslinking process using the EDC/NHS and CaCl2 was adopted and found to be effective in the fabrication of cell-loaded hydrogel/Ti-6Al-4V scaffold system. This hybrid Ti-6Al-4V scaffold/hydrogel system was designed for the reconstruction of bone defects, which are difficult to heal in the absence of suitable support materials...
November 14, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29134772/micrometer-to-15-nm-printing-of-metallic-inks-with-fountain-pen-nanolithography
#14
Talia Yeshua, Michael Layani, Rimma Dekhter, Uwe Huebner, Shlomo Magdassi, Aaron Lewis
The field of printed electronics is continually trying to reduce the dimensions of the electrical components. Here, a method of printing metallic lines with widths as small as 15 nm and up to a few micrometers using fountain pen nanolithography (FPN) is shown. The FPN technique is based on a bent nanopipette with atomic force feedback that acts similar to a nanopen. The geometry of the nanopen allows for rapid placement accuracy of the printing tip, on any desired location, with the highest of optical sub-micrometer resolution...
November 14, 2017: Small
https://www.readbyqxmd.com/read/29133324/effects-of-falls-prevention-interventions-on-falls-outcomes-for-hospitalised-adults-protocol-for-a-systematic-review-with-meta-analysis
#15
Susan C Slade, David L Carey, Anne-Marie Hill, Meg E Morris
INTRODUCTION: Falls are a major global public health problem and leading cause of accidental or unintentional injury and hospitalisation. Falls in hospital are associated with longer length of stay, readmissions and poor outcomes. Falls prevention is informed by knowledge of reversible falls risk factors and accurate risk identification. The extent to which hospital falls are prevented by evidence-based practice, patient self-management initiatives, environmental modifications and optimisation of falls prevention systems awaits confirmation...
November 12, 2017: BMJ Open
https://www.readbyqxmd.com/read/29133201/diabetes-related-amputations-create-considerable-public-health-burden-in-the-uk
#16
REVIEW
Heather Graz, Vijay K D Souza, David E C Alderson, Michael Graz
AIMS: The main aim of this study was to assess the cost of diabetic amputation (both direct and indirect) to the National Health Service from the point of amputation onwards. METHODS: This systematic review involved searches of published literature between January 2007 and March 2017 mainly using the bibliographic databases, the Cochrane Library, EMBASE via Ovid(®), MEDLINE via Ovid(®), as well as grey literature, both in print and in electronic formats published through non-commercial publications, which reported the cost of amputation due to diabetic foot ulcers RESULTS: The studies included in this review varied considerably in estimating the cost including cost elements and how those costs were categorised...
November 10, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/29128713/non-enzymatic-electrochemical-detection-of-glucose-with-a-disposable-paper-based-sensor-using-a-cobalt-phthalocyanine-ionic-liquid-graphene-composite
#17
Sudkate Chaiyo, Eda Mehmeti, Weena Siangproh, Thai Long Hoang, Hai Phong Nguyen, Orawon Chailapakul, Kurt Kalcher
We introduce for the first time a paper-based analytical device (PAD) for the non-enzymatic detection of glucose by modifying a screen-printed carbon electrode with cobalt phthalocyanine, graphene and an ionic liquid (CoPc/G/IL/SPCE). The modifying composite was characterized by UV-visible spectroscopy, energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The disposable devices show excellent conductivity and fast electron transfer kinetics...
November 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29125645/advanced-plasmonic-materials-for-dynamic-color-display
#18
REVIEW
Lei Shao, Xiaolu Zhuo, Jianfang Wang
Plasmonic structures exhibit promising applications in high-resolution and durable color generation. Research on advanced hybrid plasmonic materials that allow dynamically reconfigurable color control has developed rapidly in recent years. Some of these results may give rise to practically applicable reflective displays in living colors with high performance and low power consumption. They will attract broad interest from display markets, compared with static plasmonic color printing, for example, in applications such as digital signage, full-color electronic paper, and electronic device screens...
November 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29125277/3d-printed-hierarchical-porous-frameworks-for-sodium-storage
#19
Junwei Ding, Kai Shen, Zhiguo Du, Bin Li, Shubin Yang
Exploring 3D printing to the field of sodium ion batteries is a great challenge since conventionally inks cause unavoidably compact filaments or frameworks, which significantly hamper the infiltration of electrolyte and diffusion of big-size sodium ions (1.02 Å), resulting in low reversible capacities. Here, new hierarchical porous frameworks are 3D printed for sodium storage by employing well-designed GO-contained inks. The resultant frameworks possess continuous filaments, hierarchical multihole gridding...
November 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29119163/superhydrophobic-inkjet-printed-flexible-graphene-circuits-via-direct-pulsed-laser-writing
#20
Suprem R Das, Srilok Srinivasan, Loreen R Stromberg, Qing He, Nathaniel Garland, Warren E Straszheim, Pulickel M Ajayan, Ganesh Balasubramanian, Jonathan C Claussen
Solution-phase printing of exfoliated graphene flakes is emerging as a low-cost means to create flexible electronics for numerous applications. The electrical conductivity and electrochemical reactivity of printed graphene has been shown to improve with post-print processing methods such as thermal, photonic, and laser annealing. However, to date no reports have shown the manipulation of surface wettability via post-print processing of printed graphene. Herein, we demonstrate how the energy density of a direct-pulsed laser writing (DPLW) technique can be varied to tune the hydrophobicity and electrical conductivity of the inkjet-printed graphene (IPG)...
November 9, 2017: Nanoscale
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