A novel approach for measuring room temperature enthalpy of mixing and associated solubility estimation of a drug in a polymer matrix

Polymer ◽  
2018 ◽  
Vol 135 ◽  
pp. 50-60 ◽  
Author(s):  
Jonas Alin ◽  
Nico Setiawan ◽  
Matthew Defrese ◽  
James DiNunzio ◽  
Hang Lau ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Room Temperature ◽  
Enthalpy Of Mixing ◽  
Novel Approach ◽  
Solubility Estimation

scholarly journals The Structural, Electronic, and Optical Properties of Ge/Si Quantum Wells: Lasing at a Wavelength of 1550 nm

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 1006
Author(s):  
Hongqiang Li ◽  
Jianing Wang ◽  
Jinjun Bai ◽  
Shanshan Zhang ◽  
Sai Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Room Temperature ◽  
Light Emission ◽  
Single Mode ◽  
Group Iv ◽  
Light Power ◽  
Fully Integrated ◽  
Electronic And Optical Properties ◽  
Novel Approach

The realization of a fully integrated group IV electrically driven laser at room temperature is an essential issue to be solved. We introduced a novel group IV side-emitting laser at a wavelength of 1550 nm based on a 3-layer Ge/Si quantum well (QW). By designing this scheme, we showed that the structural, electronic, and optical properties are excited for lasing at 1550 nm. The preliminary results show that the device can produce a good light spot shape convenient for direct coupling with the waveguide and single-mode light emission. The laser luminous power can reach up to 2.32 mW at a wavelength of 1550 nm with a 300-mA current. Moreover, at room temperature (300 K), the laser can maintain maximum light power and an ideal wavelength (1550 nm). Thus, this study provides a novel approach to reliable, efficient electrically pumped silicon-based lasers.

Synthesis and Applications of Crack-Free SiO2 Monolith Containing CdSe/ZnS Quantum Dots as Passive Lighting Sources

2008 ◽  
Vol 8 (9) ◽  
pp. 4538-4542 ◽  
Author(s):  
Dong Kee Yi
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Polymer Matrix ◽  
High Power ◽  
Surface Coating ◽  
Room Temperature ◽  
Ethanol Solution ◽  
Uv Led ◽  
Uv Lamp ◽  
Photo Stability

A reverse microemulsion technique has been used to synthesize quantum dot nanocomposites within a SiO2 surface coating. With this approach, the unique optical properties of the CdSe/ZnS quantum dots were preserved. CdSe/ZnS/SiO2 nanoparticles were homogeneously distributed in a tetramethyl orthosilicate ethanol solution and gelation process was initiated within a 10 min, and was left over night at room temperature and dried fully to achieve a solid SiO2 monolith. The resulting monolith was transparent and fluorescent under ultraviolet (UV) lamp. Moreover the monolith produced was crack-free. Further studies on the photo stability of the monolith were performed using a high power UV LED device. Remarkably, quantum dots in the SiO2 monolith showed better photo stability compared with those dispersed in a polymer matrix.

scholarly journals Anion exchange in inorganic perovskite nanocrystal polymer composites

2018 ◽  
Vol 9 (42) ◽  
pp. 8121-8126 ◽  
Author(s):  
Maria Sygletou ◽  
Maria-Eleni Kyriazi ◽  
Antonios G. Kanaras ◽  
Emmanuel Stratakis
Keyword(s):  
Polymer Composites ◽  
Anion Exchange ◽  
Polymer Matrix ◽  
Room Temperature ◽  
Low Cost ◽  
Inorganic Perovskite ◽  
Temperature Method ◽  
Lead Bromide

We demonstrate a facile, low-cost and room-temperature method of anion exchange in cesium lead bromide nanocrystals (CsPbBr3 NCs), embedded into a polymer matrix.

scholarly journals Novel Aurivillius Bi4Ti3−2xNbxFexO12 phases with increasing magnetic-cation fraction until percolation: a novel approach for room temperature multiferroism

2020 ◽  
Vol 8 (36) ◽  
pp. 12457-12469
Author(s):  
Miguel Algueró ◽  
Miguel Pérez-Cerdán ◽  
Rafael P. del Real ◽  
Jesús Ricote ◽  
Alicia Castro
Keyword(s):  
General Formula ◽  
Room Temperature ◽  
Magnetoelectric Coupling ◽  
Novel Approach ◽  
Aurivillius Oxides

Aurivillius oxides with general formula (Bi2O2)(Am−1BmO3m+1) are being extensively investigated for room-temperature multiferroism and magnetoelectric coupling.

scholarly journals Large-scale preparation for efficient polymer-based room-temperature phosphorescence via click chemistry

2020 ◽  
Vol 6 (21) ◽  
pp. eaaz6107 ◽  
Author(s):  
R. Tian ◽  
S.-M. Xu ◽  
Q. Xu ◽  
C. Lu
Keyword(s):  
Click Chemistry ◽  
Polymer Matrix ◽  
Large Scale ◽  
Room Temperature ◽  
Click Reaction ◽  
Covalent Binding ◽  
Scale Up ◽  
Polymeric Materials ◽  
Ab Initio Molecular Dynamics ◽  
Room Temperature Phosphorescence

To achieve efficient polymer-based room-temperature phosphorescence (RTP) materials, covalently embedding phosphors into the polymer matrix appeared as the most appealing approach. However, it is still highly challenging to fabricate RTP materials on a large scale because of the inefficient binding engineering and time-consuming covalent reactions. Here, we have proposed a scalable preparation approach for RTP materials by the facile B─O click reaction between boronic acid–modified phosphors and polyhydroxy polymer matrix. The ab initio molecular dynamics simulations demonstrated that the phosphors were effectively immobilized, resulting in the suppressed nonradiative transitions and activated RTP emission. In comparison to the reported covalent binding time of several hours, such a B─O click reaction can be accomplished within 20 s under ambient environment. The developed strategy simplified the construction of polymer-based RTP polymeric materials by the introduction of facile click chemistry. Our success provides inspirations and possibilities for the scale-up production of RTP materials.

scholarly journals Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 926 ◽  
Author(s):  
Stefano Caimi ◽  
Antoine Klaue ◽  
Hua Wu ◽  
Massimo Morbidelli
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Polymer Matrix ◽  
Room Temperature ◽  
Lithium Ion ◽  
Sio2 Nanoparticles ◽  
Alumina Nanoparticles ◽  
Promising Alternative ◽  
The Matrix ◽  
Novel Method

Safety concerns related to the use of potentially explosive, liquid organic electrolytes in commercial high-power lithium-ion batteries are constantly rising. One promising alternative is to use thermally stable ionic liquids (ILs) as conductive media, which are however, limited by low ionic conductivity at room temperature. This can be improved by adding fillers, such as silica or alumina nanoparticles (NPs), in the polymer matrix that hosts the IL. To maximize the effect of such NPs, they have to be uniformly dispersed in the matrix while keeping their size as small as possible. In this work, starting from a water dispersion of silica NPs, we present a novel method to incorporate silica NPs at the nanoscale level (<200 nm) into PVdF-HFP polymer clusters, which are then blended with the IL solution and hot-pressed to form separators suitable for battery applications. The effect of different amounts of silica in the polymer matrix on the ionic conductivity and cyclability of the separator is investigated. A membrane containing 10 wt.% of silica (with respect to the polymer) was shown to maximize the performance of the separator, with a room temperature ionic conductivity of of 1.22 mS cm − 1 . The assembled half-coin cell with LiFePO 4 and Li as the cathode and the anode exhibited a capacity retention of more than 80% at a current density of 2C and 60 ∘ C.

Profilometric Evaluation of the Worn Surfaces under Dry Reciprocating Wear Conditions of a Composite Material to Repair Brass Made Parts

2014 ◽  
Vol 657 ◽  
pp. 437-441 ◽  
Author(s):  
Virgil Iliuţă ◽  
Minodora Rîpă ◽  
Gabriel Andrei ◽  
Adriana Preda ◽  
Cornel Suciu ◽  
...  
Keyword(s):  
Composite Material ◽  
Relative Humidity ◽  
Polymer Matrix ◽  
Dry Friction ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Steel Ball ◽  
Sliding Speed ◽  
Tribological Tests ◽  
Reciprocating Wear

This paper presents the results of the profilometric analysis of wear tracks from tribological tests of a composite material made by Diamond Metallplastic GmbH, Germany. This material has a polymer matrix reinforced with Cu, Zn, Sn particles, and various allotropic forms of SiO2. The material belongs to Multimetall Messing category and is recommended by the manufacturer for repairing brass made parts. This composite material was tribologically tested in dry friction reciprocating conditions, in ball-on-flat configuration, using the tribotester CETR-UMT-2 (Bruker Corporation). The counterpiece was a steel ball. The tests were conducted at normal loads of 20, 30, 40 and 50N, over a distance of 100 m, at an average sliding speed of 3,50 mm/s, at room temperature and relative humidity of 40-60%. The wear tracks were examined with the help of a laser profilometer and the profilometric module of the tribotester CETR-UMT-2 (Bruker Corporation). The profilometric analysis results for the composite are compared to those obtained for brass. Comparing the wear tracks of the two materials, it can be found that the composite material has a better tribological behavior than the brass.

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