Acidochromic spiropyran–merocyanine stabilisation in the solid state

CrystEngComm ◽  
2018 ◽  
Vol 20 (24) ◽  
pp. 3318-3327 ◽  
Author(s):  
Vanessa Kristina Seiler ◽  
Kevin Callebaut ◽  
Koen Robeyns ◽  
Nikolay Tumanov ◽  
Johan Wouters ◽  
...  
Keyword(s):  
Solid State ◽  
Merocyanine Form ◽  
Inorganic Acids ◽  
Open Ring

Stabilizing the open-ring merocyanine form of a spiropyran compound based on co-crystallisation with inorganic acids.

Comparative studies of solid-state synthesized polyaniline doped with inorganic acids

2005 ◽  
Vol 90 (2-3) ◽  
pp. 367-372 ◽  
Author(s):  
Tursun Abdiryim ◽  
Zhang Xiao-Gang ◽  
Ruxangul Jamal
Keyword(s):  
Solid State ◽  
Comparative Studies ◽  
Inorganic Acids

scholarly journals Chaperonin GroEL accelerates protofibril formation and decorates fibrils of the Het-s prion protein

2017 ◽  
Vol 114 (34) ◽  
pp. 9104-9109 ◽  
Author(s):  
Marielle A. Wälti ◽  
Thomas Schmidt ◽  
Dylan T. Murray ◽  
Huaibin Wang ◽  
Jenny E. Hinshaw ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Consensus Sequences ◽  
Chaperonin Groel ◽  
Atomic Force ◽  
Apical Domain ◽  
Close Proximity ◽  
Single Ring ◽  
Open Ring ◽  
Regular Spacing

We have studied the interaction of the prototypical chaperonin GroEL with the prion domain of the Het-s protein using solution and solid-state NMR, electron and atomic force microscopies, and EPR. While GroEL accelerates Het-s protofibril formation by several orders of magnitude, the rate of appearance of fibrils is reduced. GroEL remains bound to Het-s throughout the aggregation process and densely decorates the fibrils at a regular spacing of ∼200 Å. GroEL binds to the Het-s fibrils via its apical domain located at the top of the large open ring. Thus, apo GroEL and bullet-shaped GroEL/GroES complexes in which only a single ring is capped by GroES interact with the Het-s fibrils; no evidence is seen for any interaction with football-shaped GroEL/GroES complexes in which both rings are capped by GroES. EPR spectroscopy shows that rotational motion of a nitroxide spin label, placed at the N-terminal end of the first β-strand of Het-s fibrils, is significantly reduced in both Het-s/GroEL aggregates and Het-s fibrils, but virtually completely eliminated in Het-s/GroEL fibrils, suggesting that in the latter, GroEL may come into close proximity to the nitroxide label. Solid-state NMR measurements indicate that GroEL binds to the mobile regions of the Het-s fibril comprising the N-terminal tail and a loop connecting β-strands 4 and 5, consistent with interactions involving GroEL binding consensus sequences located therein.

Study on Photochromic Perfluorocyclopetene Containing Six-Numbered Unit as Optical Recording Materials

2013 ◽  
Vol 327 ◽  
pp. 58-62
Author(s):  
Hai Bo Wang ◽  
Cong Bin Fan ◽  
Gang Liu
Keyword(s):  
Solid State ◽  
Absorption Band ◽  
Visible Region ◽  
Optical Recording ◽  
Absorption Peak ◽  
Pmma Film ◽  
Molecule Structure ◽  
Open Ring ◽  
Methyl Phenyl

A reversible molecule switching of symmetrical photochromic diarylethene 1,2-bis methyl phenyl perfluorocyclopentene has been synthesized and its photochromic and simulated molecule structure were also investigated. The compound exhibited photochromism both in solution and PMMA film but no photochromism in solid state. In hexane, the open-ring isomer of the diarylethene1oshowing an absorption peak at 308 nm. Upon irradiation with 313 nm light, a new absorption band in the visible region centered at 595 nm emerged to form closed isomer1c. This compound can be used as optical recording materials.

Photochromic and Kinetics Properties of a New Symmetrical Diarylethene Containing a Terminal Hydroxyl

2013 ◽  
Vol 473 ◽  
pp. 65-68
Author(s):  
Xiao Rong Dong ◽  
Le Le Ma ◽  
Gang Liu
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Emission Intensity ◽  
Optical Recording ◽  
Recording Medium ◽  
Photochromic Behavior ◽  
Open Ring ◽  
Photochemical Properties

A symmetrical photochromic diarylethene1ahas been synthesized. Its photochemical properties, including photochromic behavior and kinetics, have been investigated in detail. The compound showed good photochromism both in solution and in solid state. The back irradiation by appropriate wavelength visible light regenerated its open-ring isomers and recovered the original emission intensity. Using diarylethene1aas recording medium, polarization holographic optical recording was carried out successfully.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

The Collagenic Molecular Structural Unit of Solid State Complexes

1971 ◽  
Vol 29 ◽  
pp. 478-479
Author(s):  
Kenneth M. Richter ◽  
John A. Schilling
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Structural Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

Microstructural Variations in Melt-Spun Rapidly Solidified Ribbons

1985 ◽  
Vol 43 ◽  
pp. 54-55
Author(s):  
L. A. Bendersky ◽  
W. J. Boettinger
Keyword(s):  
Solid State ◽  
Processing Parameters ◽  
Heat Extraction ◽  
Solid State Reactions ◽  
Careful Examination ◽  
Ion Milling ◽  
Melt Spun ◽  
Wheel Side ◽  
Rapidly Solidified ◽  
Heat Extraction Rate

Rapid solidification produces a wide variety of sub-micron scale microstructure. Generally, the microstructure depends on the imposed melt undercooling and heat extraction rate. The microstructure can vary strongly not only due to processing parameters changes but also during the process itself, as a result of recalescence. Hence, careful examination of different locations in rapidly solidified products should be performed. Additionally, post-solidification solid-state reactions can alter the microstructure.The objective of the present work is to demonstrate the strong microstructural changes in different regions of melt-spun ribbon for three different alloys. The locations of the analyzed structures were near the wheel side (W) and near the center (C) of the ribbons. The TEM specimens were prepared by selective electropolishing or ion milling.

Si(Li) detector for microanalysis cooled by thermoelectric device

1992 ◽  
Vol 50 (2) ◽  
pp. 1736-1737
Author(s):  
Shaul Barkan
Keyword(s):  
Solid State ◽  
Liquid Nitrogen ◽  
Thermoelectric Device ◽  
Peltier Cooler ◽  
Complicated Process ◽  
The Common

Cooling down solid state detecors, with other different way then liquid Nitrogen, is a goal of many vendors and customers since the invention of these detectors. THe disadvantage of the common way of liquid Nitrogen is first the inavailibility of the LN in many uses (like space military and any other applications that are not done inside a well organize Laboratory). The use of LN also considers as a Labor consumer in addition to the big dewar that has to be added to any detector for storing the LN, the boiling of the LN, may cause microphonics problesm and the refiling of the dewar in many Labs is a complicated process due to inconvenience location of the microscope.In this paper I will show a spectra result of 10mm2 SiLi detector for microanalysis use, cooled by peltier cooler. The peltier cooler has the advantage of non-microphonics and non-labor needed (like adding LN to the dewar).

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

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