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https://www.readbyqxmd.com/read/28822249/en-masse-pyrolysis-of-flexible-printed-circuit-board-wastes-quantitatively-yielding-environmental-resources
#1
Jang Won Kim, Albert S Lee, Seunggun Yu, Jeong Whan Han
This paper reports the recycling of flexible printed circuit board (FPCB) waste through carbonization of polyimide by dual pyrolysis processes. The organic matter was recovered as pyrolyzed oil at low temperatures, while valuable metals and polyimide-derived carbon were effectively recovered through secondary high temperature pyrolysis. The major component of organics extracted from FPCB waste comprised of epoxy resins were identified as pyrolysis oils containing bisphenol-A. The valuable metals (Cu, Ni, Ag, Sn, Au, Pd) in waste FPCB were recovered as granular shape and quantitatively analyzed via ICP-OES...
August 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28817090/insights-on-the-optical-properties-of-poly-3-4-ethylenedioxythiophene-poly-styrenesulfonate-formulations-by-optical-metrology
#2
Argiris Laskarakis, Varvara Karagkiozaki, Despoina Georgiou, Christoforos Gravalidis, Stergios Logothetidis
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is among the most widely used polymers that are used as printed transparent electrodes for flexible Organic Electronic (OE) devices, such as Organic Photovoltaics (OPVs). The understanding of their optical properties and the correlation of the optical properties with their electronic properties and metallic-like behavior can lead to the optimization of their functionality as transparent electrodes in multilayer OE device architectures. In this work, we study the optical properties of different PEDOT:PSS formulations by non-destructive Spectroscopic Ellipsometry (SE), from the infrared to the far ultraviolet spectral regions...
August 17, 2017: Materials
https://www.readbyqxmd.com/read/28813592/3d-printed-phema-materials-for-topographical-and-biochemical-modulation-of-dorsal-root-ganglion-cell-response
#3
Adina Badea, Joselle M McCracken, Emily G Tillmaand, Mikhail Eugene Kandel, Aaron W Oraham, Molly B Mevis, Stanislav S Rubakhin, Gabriel Popescu, Jonathan V Sweedler, Ralph G Nuzzo
Understanding and controlling the interactions occurring between cells and engineered materials are central challenges towards progress in the development of biomedical devices. In this work, we describe materials for direct ink writing (DIW), an extrusion-based type of 3D printing, that embed a custom synthetic protein (RGD-PDL) within the microfilaments of 3D-hydrogel scaffolds to modify these interactions and differentially direct tissue-level organization of complex cell populations in vitro. The RGD-PDL is synthesized by modifying poly-ᴅ-lysine (PDL) to varying extents with peptides containing the integrin-binding motif Arg-Gly-Asp (RGD)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28811751/bioactive-potential-of-3d-printed-oleo-gum-resin-disks-b-papyrifera-c-myrrha-and-s-benzoin-loading-nanooxides-tio2-p25-cu2o-and-moo3
#4
Diogo José Horst, Sergio Mazurek Tebcherani, Evaldo Toniolo Kubaski, Rogério de Almeida Vieira
This experimental study investigates the bioactive potential of filaments produced via hot melt extrusion (HME) and intended for fused deposition modeling (FDM) 3D printing purposes. The oleo-gum-resins from benzoin, myrrha, and olibanum in pure state and also charged with 10% of metal oxide nanoparticles, TiO2, P25, Cu2O, and MoO3, were characterized by ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray microanalysis (EDXMA), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28801303/health-care-providers-knowledge-of-hpv-vaccination-barriers-and-strategies-in-a-state-with-low-hpv-vaccine-receipt-mixed-methods-study
#5
Echo L Warner, Qian Ding, Lisa Pappas, Julia Bodson, Brynn Fowler, Ryan Mooney, Anne C Kirchhoff, Deanna Kepka
BACKGROUND: Human papillomavirus (HPV) vaccination is below national goals in the United States. Health care providers are at the forefront of improving vaccination in the United States, given their close interactions with patients and parents. OBJECTIVE: The objective of this study was to assess the associations between demographic and practice characteristics of the health care providers with the knowledge of HPV vaccination and HPV vaccine guidelines. Furthermore, our aim was to contextualize the providers' perceptions of barriers to HPV vaccination and strategies for improving vaccination in a state with low HPV vaccine receipt...
August 11, 2017: JMIR Cancer
https://www.readbyqxmd.com/read/28799772/optoelectronic-properties-of-semiconductor-quantum-dot-solids-for-photovoltaic-applications
#6
Alexander A Chistyakov, Mariya A Zvaigzne, Vladimir R Nikitenko, Alexey R Tameev, Igor L Martynov, Oleg V Prezhdo
Quantum dot (QD) solids represents a new type of condensed matter that is highly relevant from both fundamental and applied points of view. The properties of QD solids are qualitatively different from those of the traditional solids, and their unique characteristics give rise to promising applications. The combination of quantum confinement in individual QDs with macroscopic scale of the whole material leads to novel features of electronic excitations (excitons) and charge transfer processes, which are of great interest for optoelectronic applications...
August 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28782570/nanomedicine-and-advanced-technologies-for-burns-preventing-infection-and-facilitating-wound-healing
#7
Mirza Ali Mofazzal Jahromi, Parham Sahandi Zangabad, Seyed Masoud Moosavi Basri, Keyvan Sahandi Zangabad, Ameneh Ghamarypour, Amir R Aref, Mahdi Karimi, Michael R Hamblin
According to the latest report from the World Health Organization, an estimated 265,000 deaths still occur every year as a direct result of burn injuries. A widespread range of these deaths induced by burn wound happens in low- and middle-income countries, where survivors face a lifetime of morbidity. Most of the deaths occur due to infections when a high percentage of the external regions of the body area is affected. Microbial nutrient availability, skin barrier disruption, and vascular supply destruction in burn injuries as well as systemic immunosuppression are important parameters that cause burns to be susceptible to infections...
August 3, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/28782439/dosimetry-verification-of-125-i-seeds-implantation-with-three-dimensional-printing-noncoplanar-templates-and-ct-guidance-for-paravertebral-retroperitoneal-malignant-tumors
#8
Zhe Ji, Yuliang Jiang, Liang Su, Fuxin Guo, Ran Peng, Haitao Sun, Jinghong Fan, Junjie Wang
OBJECTIVE: To compare dose distributions of postoperative plans with preoperative plans for radioactive seed implantation of paravertebral/retroperitoneal tumors assisted by 3-dimensional printing noncoplanar templates and computed tomography. METHODS: Sixteen patients with paravertebral/retroperitoneal tumors (21 lesions) underwent radioactive seed implantation with 3-dimensional printing noncoplanar templates. Prescribed dose was 110 to 160 Gy. We compared the dose distribution of the postoperative plan with the preoperative plan...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28780443/a-dna-biosensor-based-on-gold-nanoparticle-decorated-on-carboxylated-multi-walled-carbon-nanotubes-for-gender-determination-of-arowana-fish
#9
Kasra Saeedfar, Lee Yook Heng, Chew Poh Chiang
Multi-wall carbon nanotubes (MWCNTs) were modified to design a new DNA biosensor. Functionalized MWCNTs were equipped with gold nanoparticles (GNPs) (~15nm) (GNP-MWCNTCOOH) to construct DNA biosensors based on carbon-paste screen-printed (SPE) electrodes. GNP attachment onto functionalized MWCNTs was carried out by microwave irradiation and was confirmed by spectroscopic studies and surface analysis. DNA biosensors based on differential pulse voltammetry (DPV) were constructed by immobilizing thiolated single-stranded DNA probes onto GNP-MWCNTCOOH...
July 31, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28774030/additive-manufacturing-of-biomedical-constructs-with-biomimetic-structural-organizations
#10
REVIEW
Xiao Li, Jiankang He, Weijie Zhang, Nan Jiang, Dichen Li
Additive manufacturing (AM), sometimes called three-dimensional (3D) printing, has attracted a lot of research interest and is presenting unprecedented opportunities in biomedical fields, because this technology enables the fabrication of biomedical constructs with great freedom and in high precision. An important strategy in AM of biomedical constructs is to mimic the structural organizations of natural biological organisms. This can be done by directly depositing cells and biomaterials, depositing biomaterial structures before seeding cells, or fabricating molds before casting biomaterials and cells...
November 9, 2016: Materials
https://www.readbyqxmd.com/read/28774013/additive-manufacturing-of-patient-customizable-scaffolds-for-tubular-tissues-using-the-melt-drawing-method
#11
Yu Jun Tan, Xipeng Tan, Wai Yee Yeong, Shu Beng Tor
Polymeric fibrous scaffolds for guiding cell growth are designed to be potentially used for the tissue engineering (TE) of tubular organs including esophagi, blood vessels, tracheas, etc. Tubular scaffolds were fabricated via melt-drawing of highly elastic poly(l-lactide-co-ε-caprolactone) (PLC) fibers layer-by-layer on a cylindrical mandrel. The diameter and length of the scaffolds are customizable via 3D printing of the mandrel. Thickness of the scaffolds was varied by changing the number of layers of the melt-drawing process...
November 3, 2016: Materials
https://www.readbyqxmd.com/read/28773924/3d-bioprinting-technologies-for-hard-tissue-and-organ-engineering
#12
REVIEW
Xiaohong Wang, Qiang Ao, Xiaohong Tian, Jun Fan, Yujun Wei, Weijian Hou, Hao Tong, Shuling Bai
Hard tissues and organs, including the bones, teeth and cartilage, are the most extensively exploited and rapidly developed areas in regenerative medicine field. One prominent character of hard tissues and organs is that their extracellular matrices mineralize to withstand weight and pressure. Over the last two decades, a wide variety of 3D printing technologies have been adapted to hard tissue and organ engineering. These 3D printing technologies have been defined as 3D bioprinting. Especially for hard organ regeneration, a series of new theories, strategies and protocols have been proposed...
September 27, 2016: Materials
https://www.readbyqxmd.com/read/28772665/process-parameter-optimization-of-extrusion-based-3d-metal-printing-utilizing-pw-ldpe-sa-binder-system
#13
Luquan Ren, Xueli Zhou, Zhengyi Song, Che Zhao, Qingping Liu, Jingze Xue, Xiujuan Li
Recently, with a broadening range of available materials and alteration of feeding processes, several extrusion-based 3D printing processes for metal materials have been developed. An emerging process is applicable for the fabrication of metal parts into electronics and composites. In this paper, some critical parameters of extrusion-based 3D printing processes were optimized by a series of experiments with a melting extrusion printer. The raw materials were copper powder and a thermoplastic organic binder system and the system included paraffin wax, low density polyethylene, and stearic acid (PW-LDPE-SA)...
March 16, 2017: Materials
https://www.readbyqxmd.com/read/28772600/electrodeposited-organic-layers-formed-from-aryl-diazonium-salts-for-inhibition-of-copper-corrosion
#14
Ana Chira, Bogdan Bucur, Gabriel-Lucian Radu
Copper substrates deposed on a gold screen-printed electrode were covered with different aryl diazonium salts by electrodeposition at 0.25 mA for 30 or 300 s. Seven compounds were investigated: 4-aminophenylacetic acid, 4-aminophenethyl alcohol, 4-fluoroaniline, 4-(heptadecafluorooctyl)aniline, 4-aminoantipyrine, 4-(4-aminophenyl)butyric acid and 3,4,5-trimethoxyaniline. Quantitative monitoring of the electrodeposition process was carried out by electrogravimetry using quartz crystal microbalance (QCM). The electrodeposited mass varies between 26 ng/cm² for 4-fluoroaniline formed during 30 s to 442 ng/cm² for 4-phenylbutyric acid formed during 300 s...
February 28, 2017: Materials
https://www.readbyqxmd.com/read/28772389/optically-clear-and-resilient-free-form-%C3%A2%C2%B5-optics-3d-printed-via-ultrafast-laser-lithography
#15
Linas Jonušauskas, Darius Gailevičius, Lina Mikoliūnaitė, Danas Sakalauskas, Simas Šakirzanovas, Saulius Juodkazis, Mangirdas Malinauskas
We introduce optically clear and resilient free-form micro-optical components of pure (non-photosensitized) organic-inorganic SZ2080 material made by femtosecond 3D laser lithography (3DLL). This is advantageous for rapid printing of 3D micro-/nano-optics, including their integration directly onto optical fibers. A systematic study of the fabrication peculiarities and quality of resultant structures is performed. Comparison of microlens resiliency to continuous wave (CW) and femtosecond pulsed exposure is determined...
January 2, 2017: Materials
https://www.readbyqxmd.com/read/28772377/mechanical-fatigue-behavior-of-flexible-printed-organic-thin-film-transistors-under-applied-strain
#16
Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
We report on the mechanical fatigue behavior of printed, organic, thin-film transistors (OTFTs) based on a polymer semiconductor, investigated by repeatedly applying strain to the flexible OTFT devices and assessing their electrical characteristics after 60,000 bending cycles. As part of our investigation, we established that the rates of reduction in source/drain currents in the OTFT device depended on bending directions. Our improved understanding of the mechanical fatigue behavior of the flexible printed OTFT devices provides valuable insights into their employment in practical flexible electronics applications...
December 28, 2016: Materials
https://www.readbyqxmd.com/read/28771375/recent-development-and-biomedical-applications-of-self-healing-hydrogels
#17
Yinan Wang, Christian K Adokoh, Ravin Narain
Hydrogels are of special importance, owing to their high-water content and various applications in biomedical and bio-engineering research. Self-healing properties is a common phenomenon in living organisms. Their endowed property of being able to self-repair after physical/chemical/mechanical damage to fully or partially its original properties demonstrates their prospective therapeutic applications. Due to complicated preparation and selection of suitable materials, the application of many host-guest supramolecular polymeric hydrogels are so limited...
August 3, 2017: Expert Opinion on Drug Delivery
https://www.readbyqxmd.com/read/28770811/fabrication-of-arbitrary-3d-components-in-cardiac-surgery-from-macro-micro-to-nanoscale
#18
Ranjith Kumar Kankala, Kai Zhu, Jun Li, Chun-Sheng Wang, Shi-Bin Wang, Ai-Zheng Chen
Fabrication of tissue-/organ-like structures at arbitrary geometries by mimicking the properties of the complex material offers enormous interest to the research and clinical applicability in cardiovascular diseases. Patient-specific, durable, and realistic three-dimensional (3D) cardiac models for anatomic consideration have been developed for education, pro-surgery planning, and intra-surgery guidance. In cardiac tissue engineering (TE), 3D printing technology is the most convenient and efficient microfabrication method to create biomimetic cardiovascular tissue for the potential in vivo implantation...
August 3, 2017: Biofabrication
https://www.readbyqxmd.com/read/28766344/cell-shaping-micropatterns-for-quantitative-super-resolution-microscopy-imaging-of-membrane-mechanosensing-proteins
#19
Anthony Fernandez, Markville Bautista, Ramunas Stanciauskas, Taerin Chung, Fabien Pinaud
Patterning cells on microcontact-printed substrates is a powerful approach to control cell morphology and introduce specific mechanical cues on a cell's molecular organization. Although global changes in cellular architectures caused by micropatterns can easily be probed with diffraction-limited optical microscopy, studying molecular reorganizations at the nanoscale demands micropatterned substrates that accommodate the optical requirements of single molecule microscopy techniques. Here, we developed a simple micropatterning strategy that provides control of cellular architectures and is optimized for nanometer accuracy single molecule tracking and three-dimensional super-resolution imaging of plasma and nuclear membrane proteins in cells...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28759433/engineering-derived-approaches-for-ipsc-preparation-expansion-differentiation-and-applications
#20
Yang Li, Ling Li, Zhi-Nan Chen, Ge Gao, Rui Yao, Wei Sun
Remarkable achievements have been made since induced pluripotent stem cells (iPSCs) were first introduced in 2006. Compared with non-pluripotent stem cells, iPSC research faces several additional complexities, such as the choice of extracellular matrix proteins, growth and differentiation factors, as well as technical challenges related to self-renewal and directed differentiation. Overcoming these challenges requires the integration of knowledge and technologies from multiple fields including cell biology, biomaterial science, engineering, physics and medicine...
July 31, 2017: Biofabrication
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