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Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
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Target Concepts:
Gene/Protein
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Enzyme
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Query: UMLS:C0027960 (
mole
)
21,279
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
We report using cationic poly(acrylamide-co-2-(dimethylamino) ethyl methacrylate, methyl chloride quaternized) (poly(AM-co-
DMC
)) to mediate biomimetic synthesis of hybrid copolymer-silica nanoparticles under ambient conditions. Poly(AM-co-
DMC
)s with various
mole
contents of
DMC
were prepared by solution copolymerization in water. Silicification was achieved by simply stirring a mixture of tetramethyl orthosilicate and an aqueous poly(AM-co-
DMC
) solution at room temperature for 30 min. Copolymers-silica hybrid nanoparticles were characterized with transmission electron microscopy (TEM), FT-IR spectroscopy, (1)H NMR, thermogravimetry and aqueous electrophoresis. TEM studies indicated that the hybrid nanoparticles have well-defined spherical morphology and relatively narrow polydispersity with diameters of less than 50 nm. The compositions and zeta potentials of hybrid nanoparticles could be controlled by simply adjusting compositions of copolymers and solution conditions for silica mineralization. Due to the tunable compositions and surface zeta potentials, these new particles would be expected to have potential applications for controlled delivery, therapeutics and bioimaging.
...
PMID:Biomimetic synthesis of copolymer-silica nanoparticles with tunable compositions and surface property. 1955 61
Modification of cotton fabric with 2-methacryloyloxyethyltrimethyl ammonium chloride (
DMC
) was achieved through free-radical initiated graft polymerization with K
2
S
2
O
8
/NaHSO
3
as the initiator. Grafting of
DMC
was confirmed by ATR-IR of the modified cotton. The optimal grafting reaction conditions, including
DMC
dosage,
mole
ratio of initiator to
DMC
, temperature, and time, were determined by cation content and dye fixation results of the modified cotton. The modified fibers were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and whiteness measurement. Salt-free dyeing of the modified cotton with commonly used C. I. Reactive Blue 19, C. I. Reactive Yellow 145, and C. I. Reactive Red 195 presented high fixation of 96.8%, 98.7%, and 97.3%, respectively. These results indicated that the modification is effective for changing the surface charge of the fiber and increasing the dye-fiber reactivity. The color fastness and strength property were still very satisfactory. With excellent properties, this dyeing method shows promise in real application for eliminating the usage of salt and reducing environmental pollution.
...
PMID:Salt-Free Dyeing of Modified Cotton through Graft Polymerization with Highly Enhanced Dye Fixation and Good Strength Properties. 3207 92
V
2
O
5
, one of the earliest intercalation-type cathode materials investigated as a Li
+
host, is characterized by an extremely high theoretical capacity (441 mAh g
-1
). However, the fast capacity fading upon cycling in conventional carbonate-based electrolytes is an unresolved issue. Herein, we show that using a LiTFSI/tetraglyme (1:1 in
mole
ratio) electrolyte yields a highly enhanced cycling ability of V
2
O
5
(from 20% capacity retention to 80% after 100 cycles at 50 mA g
-1
within 1.5-4.0 V vs Li
+
/Li). The improved performance mostly originates from the V
2
O
5
electrode itself, since refreshing the electrolyte and the lithium electrode of the cycled cells does not help in restoring the V
2
O
5
electrode capacity. Electrochemical impedance spectroscopy (EIS), post-mortem scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, and X-ray photoelectron spectroscopy (XPS) have been employed to investigate the origin of the improved electrochemical behavior. The results demonstrate that the enhanced cyclability is a consequence of a thinner but more stable cathode-electrolyte interphase (CEI) layer formed in LiTFSI/tetraglyme with respect to the one occurring in 1 M LiPF
6
in EC/
DMC
(1:1 in weight ratio, LP30). These results show that the cyclability of V
2
O
5
can be effectively improved by simple electrolyte engineering. At the same time, the uncovered mechanism further reveals the vital role of the CEI on the cyclability of V
2
O
5
, which can be helpful for the performance optimization of vanadium-oxide-based batteries.
...
PMID:Cathode-Electrolyte Interphase in a LiTFSI/Tetraglyme Electrolyte Promoting the Cyclability of V
2
O
5
. 3321 45
