Controlled formation of chitosan particles by a clock reaction

Soft Matter ◽  
2018 ◽  
Vol 14 (31) ◽  
pp. 6415-6418 ◽  
Author(s):  
Guido Panzarasa ◽  
Alina Osypova ◽  
Alba Sicher ◽  
Arie Bruinink ◽  
Eric R. Dufresne
Keyword(s):  
Time Domain ◽  
Self Assembly ◽  
The Time Domain ◽  
Clock Reaction

Directed self-assembly of chitosan as tunable-size particles is achieved in the time domain by means of the formaldehyde clock reaction.

scholarly journals Supramolecular assembly by time-programmed acid autocatalysis

2020 ◽  
Vol 5 (2) ◽  
pp. 445-448 ◽  
Author(s):  
Guido Panzarasa ◽  
Tianqi Sai ◽  
Alexandre L. Torzynski ◽  
Katrina Smith-Mannschott ◽  
Eric R. Dufresne
Keyword(s):  
Time Domain ◽  
Self Assembly ◽  
Supramolecular Assembly ◽  
Cyclic Ester ◽  
The Time Domain ◽  
Hydrolysis Of ◽  
Clock Reaction

Coupling an acid-autocatalyzed clock reaction with the hydrolysis of a cyclic ester enables the time-domain programming of supramolecular pH-driven self-assembly.

scholarly journals ATP-fuelled self-assembly to regulate chemical reactivity in the time domain

2020 ◽  
Vol 11 (6) ◽  
pp. 1518-1522 ◽  
Author(s):  
Maria A. Cardona ◽  
Leonard J. Prins
Keyword(s):  
Time Domain ◽  
Self Assembly ◽  
Chemical Reactivity ◽  
Bond Formation ◽  
Complex Mixture ◽  
Hydrazone Bond ◽  
The Time Domain

The addition of ATP under dissipative conditions to a complex mixture causes the transient upregulation of hydrazone-bond formation.

Transient Supramolecular Assembly by Programmable pH Cycles

2019 ◽  
Author(s):  
Guido Panzarasa ◽  
Alexandre L. Torzynski ◽  
Tianqi Sai ◽  
Katrina Smith-Mannschott ◽  
Eric R. Dufresne
Keyword(s):  
Time Domain ◽  
Self Assembly ◽  
Supramolecular Assembly ◽  
Materials Design ◽  
Active Materials ◽  
The Time Domain

<div>Transient self-assembly is a necessary step towards the development of life-like materials. Our approach allows to program pH-driven supramolecular assembly in the time domain with tailorable lag- and life-times, overcoming the limitations of previously described approaches and setting a new standard for active materials design.<br></div><div><br></div>

Transient Supramolecular Assembly by Programmable pH Cycles

2019 ◽  
Author(s):  
Guido Panzarasa ◽  
Alexandre L. Torzynski ◽  
Tianqi Sai ◽  
Katrina Smith-Mannschott ◽  
Eric R. Dufresne
Keyword(s):  
Time Domain ◽  
Self Assembly ◽  
Supramolecular Assembly ◽  
Materials Design ◽  
Active Materials ◽  
The Time Domain

<div>Transient self-assembly is a necessary step towards the development of life-like materials. Our approach allows to program pH-driven supramolecular assembly in the time domain with tailorable lag- and life-times, overcoming the limitations of previously described approaches and setting a new standard for active materials design.<br></div><div><br></div>

99 Semesters of Chemistry - A Personal Retrospective on the Molecular State Approach by Preparative Chemists

1997 ◽  
Vol 62 (1) ◽  
pp. 1-41 ◽  
Author(s):  
Hans Bock
Keyword(s):  
Gas Phase ◽  
Time Domain ◽  
Self Assembly ◽  
Electron Distribution ◽  
Building Blocks ◽  
Molecular State ◽  
Reaction Pathways ◽  
Dynamic Relaxation ◽  
The Time Domain ◽  
Microscopic Reaction

Molecular states are the real building blocks of the chemist, because the structure of a molecule can change considerably as its energy and thus its electron distribution varies within the time-domain of dynamic relaxation. The ever increasing use of measuring methods from the armory of physics to characterize molecules by their molecular state fingerprints and, above all, of computers to rationalize both their properties and their microscopic reaction pathways, provides a wealth of information for the development of chemistry. To deal with the complexity of molecular states, a qualitative model based on the topology and symmetry of their structures as well as of their energies resulting from the electron distribution over the respective effective nuclear potentials is presented and is illustrated by examples of our own efforts to elucidate molecular state properties including time-dependent dynamics, microscopic reaction pathways both in the gas phase and in solution, and the self-assembly of molecules on crystallization. In conclusion, a personal retrospective is summarized and some prospects for the future are outlined.

Apodisation in the time domain

1992 ◽  
Vol 2 (4) ◽  
pp. 615-620
Author(s):  
G. W. Series
Keyword(s):  
Time Domain ◽  
The Time Domain

JOINT INTERPRETATION OF AIRBORNE ELECTROMAGNETIC DATA IN THE TIME DOMAIN AND FREQUENCY DOMAIN

2018 ◽  
Vol 12 (7-8) ◽  
pp. 76-83
Author(s):  
E. V. KARSHAKOV ◽  
J. MOILANEN
Keyword(s):  
Fourier Transform ◽  
Frequency Domain ◽  
Time Domain ◽  
Frequency Interval ◽  
Single Spectrum ◽  
Simultaneous Inversion ◽  
Homogeneous Half Space ◽  
Time Domain Data ◽  
The Time Domain

Тhe advantage of combine processing of frequency domain and time domain data provided by the EQUATOR system is discussed. The heliborne complex has a towed transmitter, and, raised above it on the same cable a towed receiver. The excitation signal contains both pulsed and harmonic components. In fact, there are two independent transmitters operate in the system: one of them is a normal pulsed domain transmitter, with a half-sinusoidal pulse and a small "cut" on the falling edge, and the other one is a classical frequency domain transmitter at several specially selected frequencies. The received signal is first processed to a direct Fourier transform with high Q-factor detection at all significant frequencies. After that, in the spectral region, operations of converting the spectra of two sounding signals to a single spectrum of an ideal transmitter are performed. Than we do an inverse Fourier transform and return to the time domain. The detection of spectral components is done at a frequency band of several Hz, the receiver has the ability to perfectly suppress all sorts of extra-band noise. The detection bandwidth is several dozen times less the frequency interval between the harmonics, it turns out thatto achieve the same measurement quality of ground response without using out-of-band suppression you need several dozen times higher moment of airborne transmitting system. The data obtained from the model of a homogeneous half-space, a two-layered model, and a model of a horizontally layered medium is considered. A time-domain data makes it easier to detect a conductor in a relative insulator at greater depths. The data in the frequency domain gives more detailed information about subsurface. These conclusions are illustrated by the example of processing the survey data of the Republic of Rwanda in 2017. The simultaneous inversion of data in frequency domain and time domain can significantly improve the quality of interpretation.

scholarly journals Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

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