2019 Swanson School Summary of Faculty Research

Page 57

CHEMICAL & PETROLEUM ENGINEERING

Sachin S. Velankar, PhD

927 Benedum Hall | 3700 O’Hara Street | Pittsburgh, PA 15261 P: 412-624-9984 velankar@pitt.edu http://www.pitt.edu/~velankar/www

Professor Soft Materials and Rheology Group Department of Mechanical Engineering and Materials Science (Secondary) McGowan Institute for Regenerative Medicine

The Soft Materials and Rheology group conducts fundamental research to support the materials science of soft materials including polymers, multiphase flow, colloids, interfacial phenomena, block copolymers, thin films, and rheology. Ongoing projects include:

Capillary phenomena in Particulate Systems A sandcastle owes its strength to small menisci of water that induce attraction between the sand particles. This is a familiar example of how surface tension and wetting affect the microstructure and rheology of particulate systems. We are interested in understanding and exploiting capillary phenomena in three-phase mixtures comprising two fluid phases (often molten polymers) and one particulate species. We have constructed morphology-composition maps of such mixtures, exploited capillarity to create conductive plastics, and are now examining micromechanics of capillary forces between particles.

Diversity of bicontinuity in fluid-fluid-particle mixtures

Buckling Phenomena Slender objects readily buckle under compressive loads. We conduct research on a variety of aspects of thin film buckling including swelling induced buckling of crosslinked rubbery films, delamination of thin films, plasticity effects in thin film buckling, wrinkling and folding on viscous substrates, and the buckled topography of the luminal surface of arteries. Wrinkling and folding of thin films on a viscous liquid

Plasticity Effects in Composites Under tension, a rubber band stretches homogeneously, and then recovers its original length when released. In contrast, a strip of plastic often shows non-homogeneous strain (called “necking”), and remains deformed when released. We are examining the mechanics of rubberplastic composites, more specifically, elucidating the role of inelastic deformations. We have shown how the necking behavior of the plastic is modified by rubber, and are examining toughening mechanisms in such composites. We are also examining shape changes that appear by simply stretching and releasing such composites.

Necking and drawing of low-density polyethylene

Stretch-morphing of rubber-plastic composites

Other Research

Cocrystallization at the water/polymer interface DEPARTMENT OF CHEMICAL AND PETROLEUM ENGINEERING

We are examining the remarkable behavior of polymer-water mixtures which co-crystallize to form a hydrate. Complex material behavior (viscoelasticity, yielding, non-Newtonian rheology) is a common theme in our research. Our lab regularly assists researchers with rheological characterization of hydrogels. These include hydrogels prepared from Extracellular Matrix proteins (in collaboration with the Badylak lab at Pitt), or synthetic hydrogels used in medical or sensor applications.

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Wei Xiong, PhD, D.Eng

37min
pages 127-146

Jörg M.K. Wiezorek, PhD

2min
page 126

Guofeng Wang, PhD

2min
page 125

Jeffrey Vipperman, PhD

2min
page 124

Albert C. To, PhD

1min
page 123

Inanc Senocak, PhD

1min
page 121

Patrick Smolinski, PhD

1min
page 122

Jung-Kun Lee, PhD

3min
page 117

Ian Nettleship, PhD

2min
page 119

David Schmidt, PhD

2min
page 120

Scott X. Mao, PhD

2min
page 118

Tevis D. B. Jacobs, PhD

1min
page 116

Katherine Hornbostel, PhD

1min
page 115

Daniel G. Cole, PhD, PE

2min
page 114

William W. Clark, PhD

2min
page 113

Heng Ban, PhD, PE

2min
page 110

Minking K. Chyu, PhD

2min
page 112

Markus Chmielus, PhD

1min
page 111

M. Ravi Shankar, PhD

2min
pages 106-108

Jayant Rajgopal, PhD

2min
page 105

Paul W. Leu, PhD

1min
page 102

Lisa M. Maillart, PhD

2min
page 103

Amin Rahimian, PhD

1min
page 104

Youngjae Chun, PhD

3min
page 98

Renee M. Clark, PhD

2min
page 99

Joel M. Haight, PhD, P.E., CIH, CSP

2min
page 100

Daniel R. Jiang, PhD

1min
page 101

Karen M. Bursic, PhD

1min
page 97

Mary Besterfield-Sacre, PhD

2min
page 96

Mostafa Bedewy, PhD

1min
page 95

Minhee Yun, PhD

2min
pages 92-94

Gregory F. Reed, PhD

3min
page 88

Feng Xiong, PhD

2min
page 90

Jun Yang, PhD

3min
page 91

Guangyong Li, PhD

2min
page 86

Inhee Lee, PhD

2min
page 85

Hong Koo Kim, PhD

2min
page 83

Alexis Kwasinski, PhD

2min
page 84

Alex K. Jones, PhD

3min
page 82

Alan D. George, PhD, FIEEE

2min
page 79

Masoud Barati, PhD

2min
page 78

Brandon M. Grainger, PhD

2min
page 80

Mai Abdelhakim, PhD

1min
page 77

Radisav Vidic, PhD

2min
pages 75-76

Piervincenzo Rizzo, PhD

2min
page 73

Aleksandar Stevanovic, PhD, P.E., FASCE

2min
page 74

Carla Ng, PhD

2min
page 72

Lei Fang, PhD

3min
page 65

Alessandro Fascetti, PhD

2min
page 66

Sarah Haig, PhD

2min
page 68

Xu Liang, PhD

2min
page 70

Jeen-Shang Lin, PhD, P.E

2min
page 71

Andrew P. Bunger, PhD

2min
page 64

Melissa Bilec, PhD

2min
page 63

Judith C. Yang, PhD

2min
pages 60-62

Götz Veser, PhD

2min
page 58

Jason E. Shoemaker, PhD

1min
page 56

Tagbo Niepa, PhD

2min
page 54

Christopher E. Wilmer, PhD

1min
page 59

Sachin S. Velankar, PhD

2min
page 57

Giannis Mpourmpakis, PhD

2min
page 53

Badie Morsi, PhD

3min
page 52

James R. McKone, PhD

1min
page 51

Steve R. Little, PhD

2min
page 50

J. Karl Johnson, PhD

2min
page 47

John A. Keith, PhD

2min
page 48

Susan Fullerton, PhD

2min
page 46

Lei Li, PhD

1min
page 49

Robert M. Enick, PhD

2min
page 45

Eric J. Beckman, PhD

2min
page 44

David A. Vorp, PhD

2min
page 37

Jonathan Vande Geest, PhD

1min
page 36

Justin S. Weinbaum, PhD

1min
page 38

Ipsita Banerjee, PhD

2min
page 43

George Stetten, MD, PhD

2min
page 34

Savio L-Y. Woo, PhD, D.Sc., D.Eng

2min
page 39

Gelsy Torres-Oviedo, PhD

3min
page 35

Ioannis Zervantonakis, PhD

2min
pages 40-42

Mark Redfern, PhD

2min
page 29

Spandan Maiti, PhD

2min
page 28

Partha Roy, PhD

2min
page 30

Sanjeev G. Shroff, PhD

2min
page 33

Warren C. Ruder, PhD

1min
page 31

Joseph Thomas Samosky, PhD

2min
page 32

Patrick J. Loughlin, PhD

2min
page 27

Prashant N. Kumta, PhD

2min
page 26

Mangesh Kulkarni, PhD

1min
page 25

Takashi “TK” Kozai, PhD

2min
page 24

Alan D. Hirschman, PhD

1min
page 21

Tamer S. Ibrahim, PhD

5min
page 22

Mark Gartner, PhD

1min
page 20

Bistra Iordanova, PhD

1min
page 23

Richard E. Debski, PhD

1min
page 17

Neeraj J. Gandhi, PhD

2min
page 19

William Federspiel, PhD

2min
page 18

Lance A. Davidson, PhD

2min
page 16

Aaron Batista, PhD

4min
page 9

Rakié Cham, PhD

2min
page 13

Bryan N. Brown, PhD

1min
page 12

Tracy Cui, PhD

2min
page 14

Kurt E. Beschorner, PhD

2min
page 10

Moni Kanchan Datta, PhD

2min
page 15

Harvey Borovetz, PhD

1min
page 11

Steven Abramowitch, PhD

2min
page 8
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