July 2022 - BNC-all - ecn.purdue.edu

REMINDER: Seminar: HYDRODYNAMIC PHENOMENA IN THERMAL TRANSPORT
by Abrol, Sangeeta Saddul 25 Jul '22

25 Jul '22

Sent on behalf of Ali Shakouri. Dear Colleagues, Next week Prof. Xavier Alvarez from Univ. Autonoma in Barcelona is visiting us and will be at the Birck center on July 25-29. He is an expert in extended thermodynamics and transport (heat, sound). His recent research has focused on phonon hydrodynamics, quasi ballistic effects and the observation of 2nd sound. He will give a seminar (see below the abstract) on Tuesday July 26th from 1:00pm-2:00pm in BRK 1001. Please let me know if you would be interested to meet with Prof. Alvarez next week. Best regards, Ali Shakouri ************* TITLE: HYDRODYNAMIC PHENOMENA IN THERMAL TRANSPORT Xavier Alvarez Universitat Autònoma de Barcelona ABSTRACT: A large number of experimental observations incompatible with the classical Fourier description of thermal transport at the nanometer and in the picosecond scales has been reported in the last decade. Despite the theoretical efforts done in the topic, a model able to describe the gathered data at all length and time scales is still not available. Two different descriptions have been proposed. Phonon hydrodynamics has been used as a framework to model thermal transport in materials where momentum conservation in phonon-phonon collisions is important. For other situations, a kinetic description based on the propagation of independent phonons, in what is called quasiballistic description, has been developed. The fundamental difference between them is in the number of length or time scales required to describe the observations. While in the hydrodynamic approach, a single scale is enough, in the quasiballistic description, the full set of phonon scales is necessary. For graphene and other 2D materials, the hydrodynamic approach has been the traditional main stream, while the quasiballistic approach has been more used for classical bulk semiconductors. In the last years, some experiments and theoretical descriptions seems to be challenging this traditional splitting. On the one side, some predictions of the hydrodynamic regime for 2D materials like the second sound velocity have put on doubt the standard approach. On the other side, collective phonon behavior like the use of a single time scale to describe thermal decay in a silicon substrate or the observation of second sound in germanium seem to indicate that the hydrodynamic description could be used in these semiconductors. This could be an indication that a more unified framework could be proposed. The talk will cover some of the most recent evidences in the theoretical and experimental research on thermal transport and we will analyze them in the framework of the Kinetic/Collective model (KCM), developed to give a more generalized framework to describe thermal experiments.

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FW: Special Seminar Announcement
by Abrol, Sangeeta Saddul 25 Jul '22

25 Jul '22

Sent on behalf of Audra Weideman Please join us for the Special Seminar on Tuesday, August 2, 2022 Where: BRWN 4102 When: Tuesday, August 2, 2022 Time: 1:30 – 2:30 p.m. Guest Speaker: Professor Udo Schwingenschloegl Applied Physics at King Abdullah University of Science and Technology (KAUST) Title: "Predicting the Gas Sensing Performance of 2D Materials" See attached abstract. Thank you, Audra Weideman She/Her Associate Administrative Assistant Department of Chemistry Wetherill Hall of Chemistry 560 Oval Drive West Lafayette, IN 47907 o: 765-494-9264 [DB2674B4]<https://www.purdue.edu/?utm_source=signature&utm_medium=email&utm_campaign=…>

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FW: Special Seminar August 9, 2022
by Abrol, Sangeeta Saddul 23 Jul '22

23 Jul '22

Please see attached a special seminar announcement that might be of interest by Dr. Stefan Scheel, University of Rostock, Germany on Tuesday, August 9, 2022 Time: 2:00 P.M. Location: PHYS 242 Thanks, Sangeeta From: Alaeian, Hadiseh <halaeian(a)purdue.edu> Sent: Friday, July 22, 2022 10:52 AM To: Abrol, Sangeeta Saddul <abrols(a)purdue.edu> Subject: Fw: Special Seminar August 9, 2022 Hi Sangeeta, can you please announce this talk to BRK mailing list, too? Thanks, Hadiseh ________________________________ From: physfaculty-bounces(a)lists.purdue.edu<mailto:physfaculty-bounces@lists.purdue.edu> <physfaculty-bounces(a)lists.purdue.edu<mailto:physfaculty-bounces@lists.purdue.edu>> on behalf of Nahlik, Debra A <dnahlik(a)purdue.edu<mailto:dnahlik@purdue.edu>> Sent: Friday, July 22, 2022 10:26 AM To: 'physall(a)purdue.edu' <physall(a)purdue.edu<mailto:physall@purdue.edu>> Subject: [Physfaculty] Special Seminar August 9, 2022 Please see attached for more information. Debbie Nahlik Executive Assistant to the Department Head Department of Physics and Astronomy Purdue University 525 Northwestern Avenue West Lafayette, Indiana 47907 Email: dnahlik(a)purdue.edu<mailto:dnahlik@purdue.edu> Phone: (765) 494-5564 [cid:image001.png@01D89DB5.70B967F0]

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Seminar: HYDRODYNAMIC PHENOMENA IN THERMAL TRANSPORT
by Abrol, Sangeeta Saddul 22 Jul '22

22 Jul '22

Sent on behalf of Ali Shakouri. Dear Colleagues, Next week Prof. Xavier Alvarez from Univ. Autonoma in Barcelona is visiting us and will be at the Birck center on July 25-29. He is an expert in extended thermodynamics and transport (heat, sound). His recent research has focused on phonon hydrodynamics, quasi ballistic effects and the observation of 2nd sound. He will give a seminar (see below the abstract) on Tuesday July 26th from 1:00pm-2:00pm in BRK 1001. Please let me know if you would be interested to meet with Prof. Alvarez next week. Best regards, Ali Shakouri ************* TITLE: HYDRODYNAMIC PHENOMENA IN THERMAL TRANSPORT Xavier Alvarez Universitat Autònoma de Barcelona ABSTRACT: A large number of experimental observations incompatible with the classical Fourier description of thermal transport at the nanometer and in the picosecond scales has been reported in the last decade. Despite the theoretical efforts done in the topic, a model able to describe the gathered data at all length and time scales is still not available. Two different descriptions have been proposed. Phonon hydrodynamics has been used as a framework to model thermal transport in materials where momentum conservation in phonon-phonon collisions is important. For other situations, a kinetic description based on the propagation of independent phonons, in what is called quasiballistic description, has been developed. The fundamental difference between them is in the number of length or time scales required to describe the observations. While in the hydrodynamic approach, a single scale is enough, in the quasiballistic description, the full set of phonon scales is necessary. For graphene and other 2D materials, the hydrodynamic approach has been the traditional main stream, while the quasiballistic approach has been more used for classical bulk semiconductors. In the last years, some experiments and theoretical descriptions seems to be challenging this traditional splitting. On the one side, some predictions of the hydrodynamic regime for 2D materials like the second sound velocity have put on doubt the standard approach. On the other side, collective phonon behavior like the use of a single time scale to describe thermal decay in a silicon substrate or the observation of second sound in germanium seem to indicate that the hydrodynamic description could be used in these semiconductors. This could be an indication that a more unified framework could be proposed. The talk will cover some of the most recent evidences in the theoretical and experimental research on thermal transport and we will analyze them in the framework of the Kinetic/Collective model (KCM), developed to give a more generalized framework to describe thermal experiments.

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ICDD database for XRD - Remote PC - can be used from any place!
by Abrol, Sangeeta Saddul 08 Jul '22

08 Jul '22

Sent on behalf of Dmitry Zemlyanov Dear Birck Research Community, We would like to announce that with help of the EVPRP Instrument Program, the International Centre for Diffraction Data (ICDD) database, PDF-4+, was purchased. This database is a primary reference of X-ray powder diffraction (XRD) data, which became known as the Powder Diffraction File (PDF). PDF is a collection of single-phase X-ray powder diffraction patterns in the form of tables of characteristic interplanar spacings and corresponding relative intensities along with other pertinent physical and crystallographic properties. As it was announced earlier, one license of ICDD database is installed on the public computer at BRK 1045, and any XRD-trained user can use the database free of charge. We have deployed the second license on another PC, which can be remotely accessed using Windows Remote Desktop. Please contact Dr. Dmitry Zemlyanov (dzemlian(a)purdue.edu<mailto:dzemlian@purdue.edu>) to get permission for Remote Desktop of this PC. The calendar to reserve the usage is here: https://purdue.ilabsolutions.com/schedules/501902#/ (it is free of charge but you still need to reserve). You also can find this reservation at 'BRK Metrology Core' -> 'Space Reservation (No Cost)' -> 'BRK 1045 Remote PC - ICDD PDF-4+ 2022' Please contact Dr. Dmitry Zemlyanov if you have any questions. Best regards, Dmitry Zemlyanov ***************************************** Dmitry Zemlyanov, PhD Senior Research Scientist - Surface Science Application Purdue University Birck Nanotechnology Center, 1205 West State Street, West Lafayette, IN 47907-2057 Tel.: +1 (765) 496-2457 (office - BRK 1274) +1 (765) 496-6217 (lab - BRK 1077) Cell: +1 (765) 427-3813 Fax: +1 (765) 496-8299 mailto:dzemlian@purdue.edu web: https://www.purdue.edu/discoverypark/birck/facilities/equipment/Characteriz…

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