Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Physics Expert

Viscoelasticity:

problem 1: A deformation of cross-linked polymeric microgel particle (Carbopol) is described by the Kelvin-Voigt model (a spring with elastic modulus E and dashpot with viscosity connected in parallel). The elastic response is produced by the polymer skeleton of the particle while the viscous one by the liquid contained in the network. The microgel particle in an AFM experiment is confined between two flat surfaces such that it makes a cylinder with diameter of 2 m. Under constant load of 200 pN, it sags by 5% after 10 seconds while finally shrinking by 15% in height. find out the elastic modulus E and equivalent viscosity of the Carbopol material. find out the time the microgel would require to recover to 99% of its initial height after the stress is removed.

DLVO interactions:

problem 2: Consider a solution of lysozyme proteins in 1 mmol/L salt buffer with the Debye length of ca. 10 nm. The charge on proteins at these conditions is 10e, the Hamaker constant H = 10kBT. The shape of the molecule can be approximated by a sphere with radius of 1.7 nm. What is the potential barrier for the molecule aggregation? Will the solution be stable at these conditions? Will it be stable at 100 mmol/L salt concentration?

Physics, Academics

  • Category:- Physics
  • Reference No.:- M93769

Have any Question? 


Related Questions in Physics

How does stephanie cootz explain family issues between male

How does Stephanie Cootz explain family issues between male and female and between parents and kids? In what ways does she employ Mill's sociological imagination?

The distance s of a moving body from a fixed point is given

The distance, s, of a moving body from a fixed point is given as a function of time, t, by s = 20e t/2 . (a) Find the velocity, v, of the body as a function of t. (b) Find a relationship between v and s, then show that s ...

Eriks puzzle in a stripped-down version of conways game of

Erik's puzzle. In a stripped-down version of Conway's game of life, cells are arranged on a square grid. Each cell is either alive or dead. Live cells do not die. Dead cells become alive if two or more of their immediate ...

1 identify two primitive and two non-primitive cells of a

1. Identify two primitive and two non-primitive cells of a two-dimensional face-centered square lattice. Give the primitive unit vector and draw it on the figure. Is this a primitive lattice or a composite of two simple ...

In a stripping process for the removal of tca from

In a stripping process for the removal of TCA from wastewater (very dilute, 50 mg TCA/L), air is bubbled into the water to transfer the TCA from the liquid phase to the gas phase. This process is carried out at 20°C and ...

Graph the functions described in parts a-da first and

Graph the functions described in parts (a)-(d). (a) First and second derivatives everywhere positive. (b) Second derivative everywhere negative; first derivative everywhere positive. (c) Second derivative everywhere posi ...

A spherical droplet of methane 2cm in diameter is burned in

A spherical droplet of methane (2cm in diameter) is burned in pure oxygen atmosphere at 2000 K and 3 atm. Oxygen is transferred to the surface by diffusion, where it is consumed by the reaction: CH 4  + 2O 2  → 2H 2 O+CO ...

Discuss how the effectiveness of skillings method scales

Discuss how the effectiveness of Skilling's method scales with dimensionality, using a correlated N-dimensional Gaussian distribution as an example. Find an expression for the rejection probability, assuming the Markov c ...

A heavy string is tied at one end to a movable support and

A heavy string is tied at one end to a movable support and to a light thread at the other end as shown in figure (15-E12). The thread goes over a fixed pulley and supports a weight to produce a tension. The lowest freque ...

At a given instant a projectile whose mass is 6 kg is

At a given instant a projectile, whose mass is 6 kg, is moving with a speed of 60 m/s and at a height of 100 m. Determine the projectile's total energy at this instant.

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen